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avcodec.h
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1 /*
2  * copyright (c) 2001 Fabrice Bellard
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23 
24 /**
25  * @file
26  * @ingroup libavc
27  * Libavcodec external API header
28  */
29 
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
42 
43 #include "version.h"
44 
45 /**
46  * @defgroup libavc libavcodec
47  * Encoding/Decoding Library
48  *
49  * @{
50  *
51  * @defgroup lavc_decoding Decoding
52  * @{
53  * @}
54  *
55  * @defgroup lavc_encoding Encoding
56  * @{
57  * @}
58  *
59  * @defgroup lavc_codec Codecs
60  * @{
61  * @defgroup lavc_codec_native Native Codecs
62  * @{
63  * @}
64  * @defgroup lavc_codec_wrappers External library wrappers
65  * @{
66  * @}
67  * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
68  * @{
69  * @}
70  * @}
71  * @defgroup lavc_internal Internal
72  * @{
73  * @}
74  * @}
75  */
76 
77 /**
78  * @ingroup libavc
79  * @defgroup lavc_encdec send/receive encoding and decoding API overview
80  * @{
81  *
82  * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
83  * avcodec_receive_packet() functions provide an encode/decode API, which
84  * decouples input and output.
85  *
86  * The API is very similar for encoding/decoding and audio/video, and works as
87  * follows:
88  * - Set up and open the AVCodecContext as usual.
89  * - Send valid input:
90  * - For decoding, call avcodec_send_packet() to give the decoder raw
91  * compressed data in an AVPacket.
92  * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
93  * containing uncompressed audio or video.
94  * In both cases, it is recommended that AVPackets and AVFrames are
95  * refcounted, or libavcodec might have to copy the input data. (libavformat
96  * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
97  * refcounted AVFrames.)
98  * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
99  * functions and process their output:
100  * - For decoding, call avcodec_receive_frame(). On success, it will return
101  * an AVFrame containing uncompressed audio or video data.
102  * - For encoding, call avcodec_receive_packet(). On success, it will return
103  * an AVPacket with a compressed frame.
104  * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
105  * AVERROR(EAGAIN) return value means that new input data is required to
106  * return new output. In this case, continue with sending input. For each
107  * input frame/packet, the codec will typically return 1 output frame/packet,
108  * but it can also be 0 or more than 1.
109  *
110  * At the beginning of decoding or encoding, the codec might accept multiple
111  * input frames/packets without returning a frame, until its internal buffers
112  * are filled. This situation is handled transparently if you follow the steps
113  * outlined above.
114  *
115  * In theory, sending input can result in EAGAIN - this should happen only if
116  * not all output was received. You can use this to structure alternative decode
117  * or encode loops other than the one suggested above. For example, you could
118  * try sending new input on each iteration, and try to receive output if that
119  * returns EAGAIN.
120  *
121  * End of stream situations. These require "flushing" (aka draining) the codec,
122  * as the codec might buffer multiple frames or packets internally for
123  * performance or out of necessity (consider B-frames).
124  * This is handled as follows:
125  * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
126  * or avcodec_send_frame() (encoding) functions. This will enter draining
127  * mode.
128  * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
129  * (encoding) in a loop until AVERROR_EOF is returned. The functions will
130  * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
131  * - Before decoding can be resumed again, the codec has to be reset with
132  * avcodec_flush_buffers().
133  *
134  * Using the API as outlined above is highly recommended. But it is also
135  * possible to call functions outside of this rigid schema. For example, you can
136  * call avcodec_send_packet() repeatedly without calling
137  * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
138  * until the codec's internal buffer has been filled up (which is typically of
139  * size 1 per output frame, after initial input), and then reject input with
140  * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
141  * read at least some output.
142  *
143  * Not all codecs will follow a rigid and predictable dataflow; the only
144  * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
145  * one end implies that a receive/send call on the other end will succeed, or
146  * at least will not fail with AVERROR(EAGAIN). In general, no codec will
147  * permit unlimited buffering of input or output.
148  *
149  * This API replaces the following legacy functions:
150  * - avcodec_decode_video2() and avcodec_decode_audio4():
151  * Use avcodec_send_packet() to feed input to the decoder, then use
152  * avcodec_receive_frame() to receive decoded frames after each packet.
153  * Unlike with the old video decoding API, multiple frames might result from
154  * a packet. For audio, splitting the input packet into frames by partially
155  * decoding packets becomes transparent to the API user. You never need to
156  * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
157  * no data was read from the packet).
158  * Additionally, sending a flush/draining packet is required only once.
159  * - avcodec_encode_video2()/avcodec_encode_audio2():
160  * Use avcodec_send_frame() to feed input to the encoder, then use
161  * avcodec_receive_packet() to receive encoded packets.
162  * Providing user-allocated buffers for avcodec_receive_packet() is not
163  * possible.
164  * - The new API does not handle subtitles yet.
165  *
166  * Mixing new and old function calls on the same AVCodecContext is not allowed,
167  * and will result in undefined behavior.
168  *
169  * Some codecs might require using the new API; using the old API will return
170  * an error when calling it. All codecs support the new API.
171  *
172  * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
173  * would be an invalid state, which could put the codec user into an endless
174  * loop. The API has no concept of time either: it cannot happen that trying to
175  * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
176  * later accepts the packet (with no other receive/flush API calls involved).
177  * The API is a strict state machine, and the passage of time is not supposed
178  * to influence it. Some timing-dependent behavior might still be deemed
179  * acceptable in certain cases. But it must never result in both send/receive
180  * returning EAGAIN at the same time at any point. It must also absolutely be
181  * avoided that the current state is "unstable" and can "flip-flop" between
182  * the send/receive APIs allowing progress. For example, it's not allowed that
183  * the codec randomly decides that it actually wants to consume a packet now
184  * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
185  * avcodec_send_packet() call.
186  * @}
187  */
188 
189 /**
190  * @defgroup lavc_core Core functions/structures.
191  * @ingroup libavc
192  *
193  * Basic definitions, functions for querying libavcodec capabilities,
194  * allocating core structures, etc.
195  * @{
196  */
197 
198 
199 /**
200  * Identify the syntax and semantics of the bitstream.
201  * The principle is roughly:
202  * Two decoders with the same ID can decode the same streams.
203  * Two encoders with the same ID can encode compatible streams.
204  * There may be slight deviations from the principle due to implementation
205  * details.
206  *
207  * If you add a codec ID to this list, add it so that
208  * 1. no value of an existing codec ID changes (that would break ABI),
209  * 2. it is as close as possible to similar codecs
210  *
211  * After adding new codec IDs, do not forget to add an entry to the codec
212  * descriptor list and bump libavcodec minor version.
213  */
214 enum AVCodecID {
216 
217  /* video codecs */
219  AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
220 #if FF_API_XVMC
221  AV_CODEC_ID_MPEG2VIDEO_XVMC,
222 #endif /* FF_API_XVMC */
357 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
395 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
414 
451 
452  /* various PCM "codecs" */
453  AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
485 
490 
491  /* various ADPCM codecs */
523 #if FF_API_VIMA_DECODER
525 #endif
526 
537 
538  /* AMR */
541 
542  /* RealAudio codecs*/
545 
546  /* various DPCM codecs */
551 
554 
555  /* audio codecs */
556  AV_CODEC_ID_MP2 = 0x15000,
557  AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
574  AV_CODEC_ID_GSM, ///< as in Berlin toast format
586  AV_CODEC_ID_GSM_MS, /* as found in WAV */
588 #if FF_API_VOXWARE
590 #endif
626 
644 
645  /* subtitle codecs */
646  AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
649  AV_CODEC_ID_TEXT, ///< raw UTF-8 text
656 
672 
673  /* other specific kind of codecs (generally used for attachments) */
674  AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
675  AV_CODEC_ID_TTF = 0x18000,
676 
677  AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
686 
687 
688  AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
689 
690  AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
691  * stream (only used by libavformat) */
692  AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
693  * stream (only used by libavformat) */
694  AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
695  AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
696 };
697 
698 /**
699  * This struct describes the properties of a single codec described by an
700  * AVCodecID.
701  * @see avcodec_descriptor_get()
702  */
703 typedef struct AVCodecDescriptor {
704  enum AVCodecID id;
706  /**
707  * Name of the codec described by this descriptor. It is non-empty and
708  * unique for each codec descriptor. It should contain alphanumeric
709  * characters and '_' only.
710  */
711  const char *name;
712  /**
713  * A more descriptive name for this codec. May be NULL.
714  */
715  const char *long_name;
716  /**
717  * Codec properties, a combination of AV_CODEC_PROP_* flags.
718  */
719  int props;
720  /**
721  * MIME type(s) associated with the codec.
722  * May be NULL; if not, a NULL-terminated array of MIME types.
723  * The first item is always non-NULL and is the preferred MIME type.
724  */
725  const char *const *mime_types;
726  /**
727  * If non-NULL, an array of profiles recognized for this codec.
728  * Terminated with FF_PROFILE_UNKNOWN.
729  */
730  const struct AVProfile *profiles;
732 
733 /**
734  * Codec uses only intra compression.
735  * Video and audio codecs only.
736  */
737 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
738 /**
739  * Codec supports lossy compression. Audio and video codecs only.
740  * @note a codec may support both lossy and lossless
741  * compression modes
742  */
743 #define AV_CODEC_PROP_LOSSY (1 << 1)
744 /**
745  * Codec supports lossless compression. Audio and video codecs only.
746  */
747 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
748 /**
749  * Codec supports frame reordering. That is, the coded order (the order in which
750  * the encoded packets are output by the encoders / stored / input to the
751  * decoders) may be different from the presentation order of the corresponding
752  * frames.
753  *
754  * For codecs that do not have this property set, PTS and DTS should always be
755  * equal.
756  */
757 #define AV_CODEC_PROP_REORDER (1 << 3)
758 /**
759  * Subtitle codec is bitmap based
760  * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
761  */
762 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
763 /**
764  * Subtitle codec is text based.
765  * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
766  */
767 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
768 
769 /**
770  * @ingroup lavc_decoding
771  * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
772  * This is mainly needed because some optimized bitstream readers read
773  * 32 or 64 bit at once and could read over the end.<br>
774  * Note: If the first 23 bits of the additional bytes are not 0, then damaged
775  * MPEG bitstreams could cause overread and segfault.
776  */
777 #define AV_INPUT_BUFFER_PADDING_SIZE 32
778 
779 /**
780  * @ingroup lavc_encoding
781  * minimum encoding buffer size
782  * Used to avoid some checks during header writing.
783  */
784 #define AV_INPUT_BUFFER_MIN_SIZE 16384
785 
786 #if FF_API_WITHOUT_PREFIX
787 /**
788  * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
789  */
790 #define FF_INPUT_BUFFER_PADDING_SIZE 32
791 
792 /**
793  * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
794  */
795 #define FF_MIN_BUFFER_SIZE 16384
796 #endif /* FF_API_WITHOUT_PREFIX */
797 
798 /**
799  * @ingroup lavc_encoding
800  * motion estimation type.
801  * @deprecated use codec private option instead
802  */
803 #if FF_API_MOTION_EST
805  ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
809  ME_EPZS, ///< enhanced predictive zonal search
810  ME_X1, ///< reserved for experiments
811  ME_HEX, ///< hexagon based search
812  ME_UMH, ///< uneven multi-hexagon search
813  ME_TESA, ///< transformed exhaustive search algorithm
814  ME_ITER=50, ///< iterative search
815 };
816 #endif
817 
818 /**
819  * @ingroup lavc_decoding
820  */
822  /* We leave some space between them for extensions (drop some
823  * keyframes for intra-only or drop just some bidir frames). */
824  AVDISCARD_NONE =-16, ///< discard nothing
825  AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
826  AVDISCARD_NONREF = 8, ///< discard all non reference
827  AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
828  AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
829  AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
830  AVDISCARD_ALL = 48, ///< discard all
831 };
832 
843  AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
844 };
845 
846 /**
847  * @ingroup lavc_encoding
848  */
849 typedef struct RcOverride{
852  int qscale; // If this is 0 then quality_factor will be used instead.
854 } RcOverride;
855 
856 #if FF_API_MAX_BFRAMES
857 /**
858  * @deprecated there is no libavcodec-wide limit on the number of B-frames
859  */
860 #define FF_MAX_B_FRAMES 16
861 #endif
862 
863 /* encoding support
864  These flags can be passed in AVCodecContext.flags before initialization.
865  Note: Not everything is supported yet.
866 */
867 
868 /**
869  * Allow decoders to produce frames with data planes that are not aligned
870  * to CPU requirements (e.g. due to cropping).
871  */
872 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
873 /**
874  * Use fixed qscale.
875  */
876 #define AV_CODEC_FLAG_QSCALE (1 << 1)
877 /**
878  * 4 MV per MB allowed / advanced prediction for H.263.
879  */
880 #define AV_CODEC_FLAG_4MV (1 << 2)
881 /**
882  * Output even those frames that might be corrupted.
883  */
884 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
885 /**
886  * Use qpel MC.
887  */
888 #define AV_CODEC_FLAG_QPEL (1 << 4)
889 /**
890  * Use internal 2pass ratecontrol in first pass mode.
891  */
892 #define AV_CODEC_FLAG_PASS1 (1 << 9)
893 /**
894  * Use internal 2pass ratecontrol in second pass mode.
895  */
896 #define AV_CODEC_FLAG_PASS2 (1 << 10)
897 /**
898  * loop filter.
899  */
900 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
901 /**
902  * Only decode/encode grayscale.
903  */
904 #define AV_CODEC_FLAG_GRAY (1 << 13)
905 /**
906  * error[?] variables will be set during encoding.
907  */
908 #define AV_CODEC_FLAG_PSNR (1 << 15)
909 /**
910  * Input bitstream might be truncated at a random location
911  * instead of only at frame boundaries.
912  */
913 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
914 /**
915  * Use interlaced DCT.
916  */
917 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
918 /**
919  * Force low delay.
920  */
921 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
922 /**
923  * Place global headers in extradata instead of every keyframe.
924  */
925 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
926 /**
927  * Use only bitexact stuff (except (I)DCT).
928  */
929 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
930 /* Fx : Flag for H.263+ extra options */
931 /**
932  * H.263 advanced intra coding / MPEG-4 AC prediction
933  */
934 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
935 /**
936  * interlaced motion estimation
937  */
938 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
939 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
940 
941 /**
942  * Allow non spec compliant speedup tricks.
943  */
944 #define AV_CODEC_FLAG2_FAST (1 << 0)
945 /**
946  * Skip bitstream encoding.
947  */
948 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
949 /**
950  * Place global headers at every keyframe instead of in extradata.
951  */
952 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
953 
954 /**
955  * timecode is in drop frame format. DEPRECATED!!!!
956  */
957 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
958 
959 /**
960  * Input bitstream might be truncated at a packet boundaries
961  * instead of only at frame boundaries.
962  */
963 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
964 /**
965  * Discard cropping information from SPS.
966  */
967 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
968 
969 /**
970  * Show all frames before the first keyframe
971  */
972 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
973 /**
974  * Export motion vectors through frame side data
975  */
976 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
977 /**
978  * Do not skip samples and export skip information as frame side data
979  */
980 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
981 /**
982  * Do not reset ASS ReadOrder field on flush (subtitles decoding)
983  */
984 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
985 
986 /* Unsupported options :
987  * Syntax Arithmetic coding (SAC)
988  * Reference Picture Selection
989  * Independent Segment Decoding */
990 /* /Fx */
991 /* codec capabilities */
992 
993 /**
994  * Decoder can use draw_horiz_band callback.
995  */
996 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
997 /**
998  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
999  * If not set, it might not use get_buffer() at all or use operations that
1000  * assume the buffer was allocated by avcodec_default_get_buffer.
1001  */
1002 #define AV_CODEC_CAP_DR1 (1 << 1)
1003 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
1004 /**
1005  * Encoder or decoder requires flushing with NULL input at the end in order to
1006  * give the complete and correct output.
1007  *
1008  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1009  * with NULL data. The user can still send NULL data to the public encode
1010  * or decode function, but libavcodec will not pass it along to the codec
1011  * unless this flag is set.
1012  *
1013  * Decoders:
1014  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1015  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1016  * returns frames.
1017  *
1018  * Encoders:
1019  * The encoder needs to be fed with NULL data at the end of encoding until the
1020  * encoder no longer returns data.
1021  *
1022  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1023  * flag also means that the encoder must set the pts and duration for
1024  * each output packet. If this flag is not set, the pts and duration will
1025  * be determined by libavcodec from the input frame.
1026  */
1027 #define AV_CODEC_CAP_DELAY (1 << 5)
1028 /**
1029  * Codec can be fed a final frame with a smaller size.
1030  * This can be used to prevent truncation of the last audio samples.
1031  */
1032 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1033 
1034 #if FF_API_CAP_VDPAU
1035 /**
1036  * Codec can export data for HW decoding (VDPAU).
1037  */
1038 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
1039 #endif
1040 
1041 /**
1042  * Codec can output multiple frames per AVPacket
1043  * Normally demuxers return one frame at a time, demuxers which do not do
1044  * are connected to a parser to split what they return into proper frames.
1045  * This flag is reserved to the very rare category of codecs which have a
1046  * bitstream that cannot be split into frames without timeconsuming
1047  * operations like full decoding. Demuxers carrying such bitstreams thus
1048  * may return multiple frames in a packet. This has many disadvantages like
1049  * prohibiting stream copy in many cases thus it should only be considered
1050  * as a last resort.
1051  */
1052 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1053 /**
1054  * Codec is experimental and is thus avoided in favor of non experimental
1055  * encoders
1056  */
1057 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1058 /**
1059  * Codec should fill in channel configuration and samplerate instead of container
1060  */
1061 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1062 /**
1063  * Codec supports frame-level multithreading.
1064  */
1065 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1066 /**
1067  * Codec supports slice-based (or partition-based) multithreading.
1068  */
1069 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1070 /**
1071  * Codec supports changed parameters at any point.
1072  */
1073 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1074 /**
1075  * Codec supports avctx->thread_count == 0 (auto).
1076  */
1077 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1078 /**
1079  * Audio encoder supports receiving a different number of samples in each call.
1080  */
1081 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1082 /**
1083  * Decoder is not a preferred choice for probing.
1084  * This indicates that the decoder is not a good choice for probing.
1085  * It could for example be an expensive to spin up hardware decoder,
1086  * or it could simply not provide a lot of useful information about
1087  * the stream.
1088  * A decoder marked with this flag should only be used as last resort
1089  * choice for probing.
1090  */
1091 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1092 /**
1093  * Codec is intra only.
1094  */
1095 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1096 /**
1097  * Codec is lossless.
1098  */
1099 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1100 
1101 
1102 #if FF_API_WITHOUT_PREFIX
1103 /**
1104  * Allow decoders to produce frames with data planes that are not aligned
1105  * to CPU requirements (e.g. due to cropping).
1106  */
1107 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
1108 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
1109 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
1110 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
1111 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
1112 #if FF_API_GMC
1113 /**
1114  * @deprecated use the "gmc" private option of the libxvid encoder
1115  */
1116 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
1117 #endif
1118 #if FF_API_MV0
1119 /**
1120  * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
1121  * mpegvideo encoders
1122  */
1123 #define CODEC_FLAG_MV0 0x0040
1124 #endif
1125 #if FF_API_INPUT_PRESERVED
1126 /**
1127  * @deprecated passing reference-counted frames to the encoders replaces this
1128  * flag
1129  */
1130 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
1131 #endif
1132 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
1133 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
1134 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
1135 #if FF_API_EMU_EDGE
1136 /**
1137  * @deprecated edges are not used/required anymore. I.e. this flag is now always
1138  * set.
1139  */
1140 #define CODEC_FLAG_EMU_EDGE 0x4000
1141 #endif
1142 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
1143 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
1144 
1145 #if FF_API_NORMALIZE_AQP
1146 /**
1147  * @deprecated use the flag "naq" in the "mpv_flags" private option of the
1148  * mpegvideo encoders
1149  */
1150 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
1151 #endif
1152 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
1153 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
1154 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1155 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1156 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1157 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1158 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1159 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1160 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1161 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1162 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1163 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1164 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1165 
1166 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1167 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1168 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1169 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1170 
1171 /* Unsupported options :
1172  * Syntax Arithmetic coding (SAC)
1173  * Reference Picture Selection
1174  * Independent Segment Decoding */
1175 /* /Fx */
1176 /* codec capabilities */
1177 
1178 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1179 /**
1180  * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1181  * If not set, it might not use get_buffer() at all or use operations that
1182  * assume the buffer was allocated by avcodec_default_get_buffer.
1183  */
1184 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1185 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1186 #if FF_API_XVMC
1187 /* Codec can export data for HW decoding. This flag indicates that
1188  * the codec would call get_format() with list that might contain HW accelerated
1189  * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1190  * including raw image format.
1191  * The application can use the passed context to determine bitstream version,
1192  * chroma format, resolution etc.
1193  */
1194 #define CODEC_CAP_HWACCEL 0x0010
1195 #endif /* FF_API_XVMC */
1196 /**
1197  * Encoder or decoder requires flushing with NULL input at the end in order to
1198  * give the complete and correct output.
1199  *
1200  * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1201  * with NULL data. The user can still send NULL data to the public encode
1202  * or decode function, but libavcodec will not pass it along to the codec
1203  * unless this flag is set.
1204  *
1205  * Decoders:
1206  * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1207  * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1208  * returns frames.
1209  *
1210  * Encoders:
1211  * The encoder needs to be fed with NULL data at the end of encoding until the
1212  * encoder no longer returns data.
1213  *
1214  * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1215  * flag also means that the encoder must set the pts and duration for
1216  * each output packet. If this flag is not set, the pts and duration will
1217  * be determined by libavcodec from the input frame.
1218  */
1219 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1220 /**
1221  * Codec can be fed a final frame with a smaller size.
1222  * This can be used to prevent truncation of the last audio samples.
1223  */
1224 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1225 #if FF_API_CAP_VDPAU
1226 /**
1227  * Codec can export data for HW decoding (VDPAU).
1228  */
1229 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1230 #endif
1231 /**
1232  * Codec can output multiple frames per AVPacket
1233  * Normally demuxers return one frame at a time, demuxers which do not do
1234  * are connected to a parser to split what they return into proper frames.
1235  * This flag is reserved to the very rare category of codecs which have a
1236  * bitstream that cannot be split into frames without timeconsuming
1237  * operations like full decoding. Demuxers carrying such bitstreams thus
1238  * may return multiple frames in a packet. This has many disadvantages like
1239  * prohibiting stream copy in many cases thus it should only be considered
1240  * as a last resort.
1241  */
1242 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1243 /**
1244  * Codec is experimental and is thus avoided in favor of non experimental
1245  * encoders
1246  */
1247 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1248 /**
1249  * Codec should fill in channel configuration and samplerate instead of container
1250  */
1251 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1252 #if FF_API_NEG_LINESIZES
1253 /**
1254  * @deprecated no codecs use this capability
1255  */
1256 #define CODEC_CAP_NEG_LINESIZES 0x0800
1257 #endif
1258 /**
1259  * Codec supports frame-level multithreading.
1260  */
1261 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1262 /**
1263  * Codec supports slice-based (or partition-based) multithreading.
1264  */
1265 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1266 /**
1267  * Codec supports changed parameters at any point.
1268  */
1269 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1270 /**
1271  * Codec supports avctx->thread_count == 0 (auto).
1272  */
1273 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1274 /**
1275  * Audio encoder supports receiving a different number of samples in each call.
1276  */
1277 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1278 /**
1279  * Codec is intra only.
1280  */
1281 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1282 /**
1283  * Codec is lossless.
1284  */
1285 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1286 
1287 /**
1288  * HWAccel is experimental and is thus avoided in favor of non experimental
1289  * codecs
1290  */
1291 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1292 #endif /* FF_API_WITHOUT_PREFIX */
1293 
1294 #if FF_API_MB_TYPE
1295 //The following defines may change, don't expect compatibility if you use them.
1296 #define MB_TYPE_INTRA4x4 0x0001
1297 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1298 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1299 #define MB_TYPE_16x16 0x0008
1300 #define MB_TYPE_16x8 0x0010
1301 #define MB_TYPE_8x16 0x0020
1302 #define MB_TYPE_8x8 0x0040
1303 #define MB_TYPE_INTERLACED 0x0080
1304 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1305 #define MB_TYPE_ACPRED 0x0200
1306 #define MB_TYPE_GMC 0x0400
1307 #define MB_TYPE_SKIP 0x0800
1308 #define MB_TYPE_P0L0 0x1000
1309 #define MB_TYPE_P1L0 0x2000
1310 #define MB_TYPE_P0L1 0x4000
1311 #define MB_TYPE_P1L1 0x8000
1312 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1313 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1314 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1315 #define MB_TYPE_QUANT 0x00010000
1316 #define MB_TYPE_CBP 0x00020000
1317 // Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
1318 #endif
1319 
1320 /**
1321  * Pan Scan area.
1322  * This specifies the area which should be displayed.
1323  * Note there may be multiple such areas for one frame.
1324  */
1325 typedef struct AVPanScan{
1326  /**
1327  * id
1328  * - encoding: Set by user.
1329  * - decoding: Set by libavcodec.
1330  */
1331  int id;
1332 
1333  /**
1334  * width and height in 1/16 pel
1335  * - encoding: Set by user.
1336  * - decoding: Set by libavcodec.
1337  */
1338  int width;
1339  int height;
1340 
1341  /**
1342  * position of the top left corner in 1/16 pel for up to 3 fields/frames
1343  * - encoding: Set by user.
1344  * - decoding: Set by libavcodec.
1345  */
1346  int16_t position[3][2];
1347 }AVPanScan;
1348 
1349 /**
1350  * This structure describes the bitrate properties of an encoded bitstream. It
1351  * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1352  * parameters for H.264/HEVC.
1353  */
1354 typedef struct AVCPBProperties {
1355  /**
1356  * Maximum bitrate of the stream, in bits per second.
1357  * Zero if unknown or unspecified.
1358  */
1360  /**
1361  * Minimum bitrate of the stream, in bits per second.
1362  * Zero if unknown or unspecified.
1363  */
1365  /**
1366  * Average bitrate of the stream, in bits per second.
1367  * Zero if unknown or unspecified.
1368  */
1370 
1371  /**
1372  * The size of the buffer to which the ratecontrol is applied, in bits.
1373  * Zero if unknown or unspecified.
1374  */
1376 
1377  /**
1378  * The delay between the time the packet this structure is associated with
1379  * is received and the time when it should be decoded, in periods of a 27MHz
1380  * clock.
1381  *
1382  * UINT64_MAX when unknown or unspecified.
1383  */
1384  uint64_t vbv_delay;
1385 } AVCPBProperties;
1386 
1387 #if FF_API_QSCALE_TYPE
1388 #define FF_QSCALE_TYPE_MPEG1 0
1389 #define FF_QSCALE_TYPE_MPEG2 1
1390 #define FF_QSCALE_TYPE_H264 2
1391 #define FF_QSCALE_TYPE_VP56 3
1392 #endif
1393 
1394 /**
1395  * The decoder will keep a reference to the frame and may reuse it later.
1396  */
1397 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1398 
1399 /**
1400  * @defgroup lavc_packet AVPacket
1401  *
1402  * Types and functions for working with AVPacket.
1403  * @{
1404  */
1406  /**
1407  * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1408  * bytes worth of palette. This side data signals that a new palette is
1409  * present.
1410  */
1412 
1413  /**
1414  * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1415  * that the extradata buffer was changed and the receiving side should
1416  * act upon it appropriately. The new extradata is embedded in the side
1417  * data buffer and should be immediately used for processing the current
1418  * frame or packet.
1419  */
1421 
1422  /**
1423  * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1424  * @code
1425  * u32le param_flags
1426  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1427  * s32le channel_count
1428  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1429  * u64le channel_layout
1430  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1431  * s32le sample_rate
1432  * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1433  * s32le width
1434  * s32le height
1435  * @endcode
1436  */
1438 
1439  /**
1440  * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1441  * structures with info about macroblocks relevant to splitting the
1442  * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1443  * That is, it does not necessarily contain info about all macroblocks,
1444  * as long as the distance between macroblocks in the info is smaller
1445  * than the target payload size.
1446  * Each MB info structure is 12 bytes, and is laid out as follows:
1447  * @code
1448  * u32le bit offset from the start of the packet
1449  * u8 current quantizer at the start of the macroblock
1450  * u8 GOB number
1451  * u16le macroblock address within the GOB
1452  * u8 horizontal MV predictor
1453  * u8 vertical MV predictor
1454  * u8 horizontal MV predictor for block number 3
1455  * u8 vertical MV predictor for block number 3
1456  * @endcode
1457  */
1459 
1460  /**
1461  * This side data should be associated with an audio stream and contains
1462  * ReplayGain information in form of the AVReplayGain struct.
1463  */
1465 
1466  /**
1467  * This side data contains a 3x3 transformation matrix describing an affine
1468  * transformation that needs to be applied to the decoded video frames for
1469  * correct presentation.
1470  *
1471  * See libavutil/display.h for a detailed description of the data.
1472  */
1474 
1475  /**
1476  * This side data should be associated with a video stream and contains
1477  * Stereoscopic 3D information in form of the AVStereo3D struct.
1478  */
1480 
1481  /**
1482  * This side data should be associated with an audio stream and corresponds
1483  * to enum AVAudioServiceType.
1484  */
1486 
1487  /**
1488  * This side data contains quality related information from the encoder.
1489  * @code
1490  * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1491  * u8 picture type
1492  * u8 error count
1493  * u16 reserved
1494  * u64le[error count] sum of squared differences between encoder in and output
1495  * @endcode
1496  */
1498 
1499  /**
1500  * This side data contains an integer value representing the stream index
1501  * of a "fallback" track. A fallback track indicates an alternate
1502  * track to use when the current track can not be decoded for some reason.
1503  * e.g. no decoder available for codec.
1504  */
1506 
1507  /**
1508  * This side data corresponds to the AVCPBProperties struct.
1509  */
1511 
1512  /**
1513  * Recommmends skipping the specified number of samples
1514  * @code
1515  * u32le number of samples to skip from start of this packet
1516  * u32le number of samples to skip from end of this packet
1517  * u8 reason for start skip
1518  * u8 reason for end skip (0=padding silence, 1=convergence)
1519  * @endcode
1520  */
1522 
1523  /**
1524  * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1525  * the packet may contain "dual mono" audio specific to Japanese DTV
1526  * and if it is true, recommends only the selected channel to be used.
1527  * @code
1528  * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1529  * @endcode
1530  */
1532 
1533  /**
1534  * A list of zero terminated key/value strings. There is no end marker for
1535  * the list, so it is required to rely on the side data size to stop.
1536  */
1538 
1539  /**
1540  * Subtitle event position
1541  * @code
1542  * u32le x1
1543  * u32le y1
1544  * u32le x2
1545  * u32le y2
1546  * @endcode
1547  */
1549 
1550  /**
1551  * Data found in BlockAdditional element of matroska container. There is
1552  * no end marker for the data, so it is required to rely on the side data
1553  * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1554  * by data.
1555  */
1557 
1558  /**
1559  * The optional first identifier line of a WebVTT cue.
1560  */
1562 
1563  /**
1564  * The optional settings (rendering instructions) that immediately
1565  * follow the timestamp specifier of a WebVTT cue.
1566  */
1568 
1569  /**
1570  * A list of zero terminated key/value strings. There is no end marker for
1571  * the list, so it is required to rely on the side data size to stop. This
1572  * side data includes updated metadata which appeared in the stream.
1573  */
1575 
1576  /**
1577  * MPEGTS stream ID, this is required to pass the stream ID
1578  * information from the demuxer to the corresponding muxer.
1579  */
1581 
1582  /**
1583  * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1584  * should be associated with a video stream and contains data in the form
1585  * of the AVMasteringDisplayMetadata struct.
1586  */
1588 
1589  /**
1590  * This side data should be associated with a video stream and corresponds
1591  * to the AVSphericalMapping structure.
1592  */
1594 
1595  /**
1596  * Content light level (based on CTA-861.3). This metadata should be
1597  * associated with a video stream and contains data in the form of the
1598  * AVContentLightMetadata struct.
1599  */
1601 
1602  /**
1603  * ATSC A53 Part 4 Closed Captions. This metadata should be associated with
1604  * a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
1605  * The number of bytes of CC data is AVPacketSideData.size.
1606  */
1608 
1609  /**
1610  * The number of side data elements (in fact a bit more than it).
1611  * This is not part of the public API/ABI in the sense that it may
1612  * change when new side data types are added.
1613  * This must stay the last enum value.
1614  * If its value becomes huge, some code using it
1615  * needs to be updated as it assumes it to be smaller than other limits.
1616  */
1618 };
1619 
1620 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1621 
1622 typedef struct AVPacketSideData {
1624  int size;
1627 
1628 /**
1629  * This structure stores compressed data. It is typically exported by demuxers
1630  * and then passed as input to decoders, or received as output from encoders and
1631  * then passed to muxers.
1632  *
1633  * For video, it should typically contain one compressed frame. For audio it may
1634  * contain several compressed frames. Encoders are allowed to output empty
1635  * packets, with no compressed data, containing only side data
1636  * (e.g. to update some stream parameters at the end of encoding).
1637  *
1638  * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1639  * ABI. Thus it may be allocated on stack and no new fields can be added to it
1640  * without libavcodec and libavformat major bump.
1641  *
1642  * The semantics of data ownership depends on the buf field.
1643  * If it is set, the packet data is dynamically allocated and is
1644  * valid indefinitely until a call to av_packet_unref() reduces the
1645  * reference count to 0.
1646  *
1647  * If the buf field is not set av_packet_ref() would make a copy instead
1648  * of increasing the reference count.
1649  *
1650  * The side data is always allocated with av_malloc(), copied by
1651  * av_packet_ref() and freed by av_packet_unref().
1652  *
1653  * @see av_packet_ref
1654  * @see av_packet_unref
1655  */
1656 typedef struct AVPacket {
1657  /**
1658  * A reference to the reference-counted buffer where the packet data is
1659  * stored.
1660  * May be NULL, then the packet data is not reference-counted.
1661  */
1663  /**
1664  * Presentation timestamp in AVStream->time_base units; the time at which
1665  * the decompressed packet will be presented to the user.
1666  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1667  * pts MUST be larger or equal to dts as presentation cannot happen before
1668  * decompression, unless one wants to view hex dumps. Some formats misuse
1669  * the terms dts and pts/cts to mean something different. Such timestamps
1670  * must be converted to true pts/dts before they are stored in AVPacket.
1671  */
1672  int64_t pts;
1673  /**
1674  * Decompression timestamp in AVStream->time_base units; the time at which
1675  * the packet is decompressed.
1676  * Can be AV_NOPTS_VALUE if it is not stored in the file.
1677  */
1678  int64_t dts;
1680  int size;
1682  /**
1683  * A combination of AV_PKT_FLAG values
1684  */
1685  int flags;
1686  /**
1687  * Additional packet data that can be provided by the container.
1688  * Packet can contain several types of side information.
1689  */
1692 
1693  /**
1694  * Duration of this packet in AVStream->time_base units, 0 if unknown.
1695  * Equals next_pts - this_pts in presentation order.
1696  */
1697  int64_t duration;
1698 
1699  int64_t pos; ///< byte position in stream, -1 if unknown
1700 
1701 #if FF_API_CONVERGENCE_DURATION
1702  /**
1703  * @deprecated Same as the duration field, but as int64_t. This was required
1704  * for Matroska subtitles, whose duration values could overflow when the
1705  * duration field was still an int.
1706  */
1709 #endif
1710 } AVPacket;
1711 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1712 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1713 /**
1714  * Flag is used to discard packets which are required to maintain valid
1715  * decoder state but are not required for output and should be dropped
1716  * after decoding.
1717  **/
1718 #define AV_PKT_FLAG_DISCARD 0x0004
1719 /**
1720  * The packet comes from a trusted source.
1721  *
1722  * Otherwise-unsafe constructs such as arbitrary pointers to data
1723  * outside the packet may be followed.
1724  */
1725 #define AV_PKT_FLAG_TRUSTED 0x0008
1726 
1732 };
1733 /**
1734  * @}
1735  */
1736 
1737 struct AVCodecInternal;
1738 
1742  AV_FIELD_TT, //< Top coded_first, top displayed first
1743  AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1744  AV_FIELD_TB, //< Top coded first, bottom displayed first
1745  AV_FIELD_BT, //< Bottom coded first, top displayed first
1746 };
1747 
1748 /**
1749  * main external API structure.
1750  * New fields can be added to the end with minor version bumps.
1751  * Removal, reordering and changes to existing fields require a major
1752  * version bump.
1753  * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1754  * applications.
1755  * The name string for AVOptions options matches the associated command line
1756  * parameter name and can be found in libavcodec/options_table.h
1757  * The AVOption/command line parameter names differ in some cases from the C
1758  * structure field names for historic reasons or brevity.
1759  * sizeof(AVCodecContext) must not be used outside libav*.
1760  */
1761 typedef struct AVCodecContext {
1762  /**
1763  * information on struct for av_log
1764  * - set by avcodec_alloc_context3
1765  */
1768 
1769  enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1770  const struct AVCodec *codec;
1771 #if FF_API_CODEC_NAME
1772  /**
1773  * @deprecated this field is not used for anything in libavcodec
1774  */
1776  char codec_name[32];
1777 #endif
1778  enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1779 
1780  /**
1781  * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1782  * This is used to work around some encoder bugs.
1783  * A demuxer should set this to what is stored in the field used to identify the codec.
1784  * If there are multiple such fields in a container then the demuxer should choose the one
1785  * which maximizes the information about the used codec.
1786  * If the codec tag field in a container is larger than 32 bits then the demuxer should
1787  * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1788  * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1789  * first.
1790  * - encoding: Set by user, if not then the default based on codec_id will be used.
1791  * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1792  */
1793  unsigned int codec_tag;
1794 
1795 #if FF_API_STREAM_CODEC_TAG
1796  /**
1797  * @deprecated this field is unused
1798  */
1800  unsigned int stream_codec_tag;
1801 #endif
1802 
1803  void *priv_data;
1804 
1805  /**
1806  * Private context used for internal data.
1807  *
1808  * Unlike priv_data, this is not codec-specific. It is used in general
1809  * libavcodec functions.
1810  */
1811  struct AVCodecInternal *internal;
1812 
1813  /**
1814  * Private data of the user, can be used to carry app specific stuff.
1815  * - encoding: Set by user.
1816  * - decoding: Set by user.
1817  */
1818  void *opaque;
1819 
1820  /**
1821  * the average bitrate
1822  * - encoding: Set by user; unused for constant quantizer encoding.
1823  * - decoding: Set by user, may be overwritten by libavcodec
1824  * if this info is available in the stream
1825  */
1826  int64_t bit_rate;
1827 
1828  /**
1829  * number of bits the bitstream is allowed to diverge from the reference.
1830  * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1831  * - encoding: Set by user; unused for constant quantizer encoding.
1832  * - decoding: unused
1833  */
1835 
1836  /**
1837  * Global quality for codecs which cannot change it per frame.
1838  * This should be proportional to MPEG-1/2/4 qscale.
1839  * - encoding: Set by user.
1840  * - decoding: unused
1841  */
1843 
1844  /**
1845  * - encoding: Set by user.
1846  * - decoding: unused
1847  */
1849 #define FF_COMPRESSION_DEFAULT -1
1850 
1851  /**
1852  * AV_CODEC_FLAG_*.
1853  * - encoding: Set by user.
1854  * - decoding: Set by user.
1855  */
1856  int flags;
1857 
1858  /**
1859  * AV_CODEC_FLAG2_*
1860  * - encoding: Set by user.
1861  * - decoding: Set by user.
1862  */
1863  int flags2;
1864 
1865  /**
1866  * some codecs need / can use extradata like Huffman tables.
1867  * MJPEG: Huffman tables
1868  * rv10: additional flags
1869  * MPEG-4: global headers (they can be in the bitstream or here)
1870  * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1871  * than extradata_size to avoid problems if it is read with the bitstream reader.
1872  * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1873  * - encoding: Set/allocated/freed by libavcodec.
1874  * - decoding: Set/allocated/freed by user.
1875  */
1878 
1879  /**
1880  * This is the fundamental unit of time (in seconds) in terms
1881  * of which frame timestamps are represented. For fixed-fps content,
1882  * timebase should be 1/framerate and timestamp increments should be
1883  * identically 1.
1884  * This often, but not always is the inverse of the frame rate or field rate
1885  * for video. 1/time_base is not the average frame rate if the frame rate is not
1886  * constant.
1887  *
1888  * Like containers, elementary streams also can store timestamps, 1/time_base
1889  * is the unit in which these timestamps are specified.
1890  * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1891  * vop_time_increment_resolution and fixed_vop_rate
1892  * (fixed_vop_rate == 0 implies that it is different from the framerate)
1893  *
1894  * - encoding: MUST be set by user.
1895  * - decoding: the use of this field for decoding is deprecated.
1896  * Use framerate instead.
1897  */
1899 
1900  /**
1901  * For some codecs, the time base is closer to the field rate than the frame rate.
1902  * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1903  * if no telecine is used ...
1904  *
1905  * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1906  */
1908 
1909  /**
1910  * Codec delay.
1911  *
1912  * Encoding: Number of frames delay there will be from the encoder input to
1913  * the decoder output. (we assume the decoder matches the spec)
1914  * Decoding: Number of frames delay in addition to what a standard decoder
1915  * as specified in the spec would produce.
1916  *
1917  * Video:
1918  * Number of frames the decoded output will be delayed relative to the
1919  * encoded input.
1920  *
1921  * Audio:
1922  * For encoding, this field is unused (see initial_padding).
1923  *
1924  * For decoding, this is the number of samples the decoder needs to
1925  * output before the decoder's output is valid. When seeking, you should
1926  * start decoding this many samples prior to your desired seek point.
1927  *
1928  * - encoding: Set by libavcodec.
1929  * - decoding: Set by libavcodec.
1930  */
1931  int delay;
1932 
1933 
1934  /* video only */
1935  /**
1936  * picture width / height.
1937  *
1938  * @note Those fields may not match the values of the last
1939  * AVFrame output by avcodec_decode_video2 due frame
1940  * reordering.
1941  *
1942  * - encoding: MUST be set by user.
1943  * - decoding: May be set by the user before opening the decoder if known e.g.
1944  * from the container. Some decoders will require the dimensions
1945  * to be set by the caller. During decoding, the decoder may
1946  * overwrite those values as required while parsing the data.
1947  */
1949 
1950  /**
1951  * Bitstream width / height, may be different from width/height e.g. when
1952  * the decoded frame is cropped before being output or lowres is enabled.
1953  *
1954  * @note Those field may not match the value of the last
1955  * AVFrame output by avcodec_receive_frame() due frame
1956  * reordering.
1957  *
1958  * - encoding: unused
1959  * - decoding: May be set by the user before opening the decoder if known
1960  * e.g. from the container. During decoding, the decoder may
1961  * overwrite those values as required while parsing the data.
1962  */
1964 
1965 #if FF_API_ASPECT_EXTENDED
1966 #define FF_ASPECT_EXTENDED 15
1967 #endif
1968 
1969  /**
1970  * the number of pictures in a group of pictures, or 0 for intra_only
1971  * - encoding: Set by user.
1972  * - decoding: unused
1973  */
1975 
1976  /**
1977  * Pixel format, see AV_PIX_FMT_xxx.
1978  * May be set by the demuxer if known from headers.
1979  * May be overridden by the decoder if it knows better.
1980  *
1981  * @note This field may not match the value of the last
1982  * AVFrame output by avcodec_receive_frame() due frame
1983  * reordering.
1984  *
1985  * - encoding: Set by user.
1986  * - decoding: Set by user if known, overridden by libavcodec while
1987  * parsing the data.
1988  */
1990 
1991 #if FF_API_MOTION_EST
1992  /**
1993  * This option does nothing
1994  * @deprecated use codec private options instead
1995  */
1997 #endif
1998 
1999  /**
2000  * If non NULL, 'draw_horiz_band' is called by the libavcodec
2001  * decoder to draw a horizontal band. It improves cache usage. Not
2002  * all codecs can do that. You must check the codec capabilities
2003  * beforehand.
2004  * When multithreading is used, it may be called from multiple threads
2005  * at the same time; threads might draw different parts of the same AVFrame,
2006  * or multiple AVFrames, and there is no guarantee that slices will be drawn
2007  * in order.
2008  * The function is also used by hardware acceleration APIs.
2009  * It is called at least once during frame decoding to pass
2010  * the data needed for hardware render.
2011  * In that mode instead of pixel data, AVFrame points to
2012  * a structure specific to the acceleration API. The application
2013  * reads the structure and can change some fields to indicate progress
2014  * or mark state.
2015  * - encoding: unused
2016  * - decoding: Set by user.
2017  * @param height the height of the slice
2018  * @param y the y position of the slice
2019  * @param type 1->top field, 2->bottom field, 3->frame
2020  * @param offset offset into the AVFrame.data from which the slice should be read
2021  */
2023  const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
2024  int y, int type, int height);
2025 
2026  /**
2027  * callback to negotiate the pixelFormat
2028  * @param fmt is the list of formats which are supported by the codec,
2029  * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2030  * The first is always the native one.
2031  * @note The callback may be called again immediately if initialization for
2032  * the selected (hardware-accelerated) pixel format failed.
2033  * @warning Behavior is undefined if the callback returns a value not
2034  * in the fmt list of formats.
2035  * @return the chosen format
2036  * - encoding: unused
2037  * - decoding: Set by user, if not set the native format will be chosen.
2038  */
2039  enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
2040 
2041  /**
2042  * maximum number of B-frames between non-B-frames
2043  * Note: The output will be delayed by max_b_frames+1 relative to the input.
2044  * - encoding: Set by user.
2045  * - decoding: unused
2046  */
2048 
2049  /**
2050  * qscale factor between IP and B-frames
2051  * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
2052  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2053  * - encoding: Set by user.
2054  * - decoding: unused
2055  */
2057 
2058 #if FF_API_RC_STRATEGY
2059  /** @deprecated use codec private option instead */
2061 #define FF_RC_STRATEGY_XVID 1
2062 #endif
2063 
2064 #if FF_API_PRIVATE_OPT
2065  /** @deprecated use encoder private options instead */
2068 #endif
2069 
2070  /**
2071  * qscale offset between IP and B-frames
2072  * - encoding: Set by user.
2073  * - decoding: unused
2074  */
2076 
2077  /**
2078  * Size of the frame reordering buffer in the decoder.
2079  * For MPEG-2 it is 1 IPB or 0 low delay IP.
2080  * - encoding: Set by libavcodec.
2081  * - decoding: Set by libavcodec.
2082  */
2084 
2085 #if FF_API_PRIVATE_OPT
2086  /** @deprecated use encoder private options instead */
2089 #endif
2090 
2091  /**
2092  * qscale factor between P- and I-frames
2093  * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
2094  * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2095  * - encoding: Set by user.
2096  * - decoding: unused
2097  */
2099 
2100  /**
2101  * qscale offset between P and I-frames
2102  * - encoding: Set by user.
2103  * - decoding: unused
2104  */
2106 
2107  /**
2108  * luminance masking (0-> disabled)
2109  * - encoding: Set by user.
2110  * - decoding: unused
2111  */
2113 
2114  /**
2115  * temporary complexity masking (0-> disabled)
2116  * - encoding: Set by user.
2117  * - decoding: unused
2118  */
2120 
2121  /**
2122  * spatial complexity masking (0-> disabled)
2123  * - encoding: Set by user.
2124  * - decoding: unused
2125  */
2127 
2128  /**
2129  * p block masking (0-> disabled)
2130  * - encoding: Set by user.
2131  * - decoding: unused
2132  */
2133  float p_masking;
2134 
2135  /**
2136  * darkness masking (0-> disabled)
2137  * - encoding: Set by user.
2138  * - decoding: unused
2139  */
2141 
2142  /**
2143  * slice count
2144  * - encoding: Set by libavcodec.
2145  * - decoding: Set by user (or 0).
2146  */
2148 
2149 #if FF_API_PRIVATE_OPT
2150  /** @deprecated use encoder private options instead */
2153 #define FF_PRED_LEFT 0
2154 #define FF_PRED_PLANE 1
2155 #define FF_PRED_MEDIAN 2
2156 #endif
2157 
2158  /**
2159  * slice offsets in the frame in bytes
2160  * - encoding: Set/allocated by libavcodec.
2161  * - decoding: Set/allocated by user (or NULL).
2162  */
2164 
2165  /**
2166  * sample aspect ratio (0 if unknown)
2167  * That is the width of a pixel divided by the height of the pixel.
2168  * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
2169  * - encoding: Set by user.
2170  * - decoding: Set by libavcodec.
2171  */
2173 
2174  /**
2175  * motion estimation comparison function
2176  * - encoding: Set by user.
2177  * - decoding: unused
2178  */
2179  int me_cmp;
2180  /**
2181  * subpixel motion estimation comparison function
2182  * - encoding: Set by user.
2183  * - decoding: unused
2184  */
2186  /**
2187  * macroblock comparison function (not supported yet)
2188  * - encoding: Set by user.
2189  * - decoding: unused
2190  */
2191  int mb_cmp;
2192  /**
2193  * interlaced DCT comparison function
2194  * - encoding: Set by user.
2195  * - decoding: unused
2196  */
2198 #define FF_CMP_SAD 0
2199 #define FF_CMP_SSE 1
2200 #define FF_CMP_SATD 2
2201 #define FF_CMP_DCT 3
2202 #define FF_CMP_PSNR 4
2203 #define FF_CMP_BIT 5
2204 #define FF_CMP_RD 6
2205 #define FF_CMP_ZERO 7
2206 #define FF_CMP_VSAD 8
2207 #define FF_CMP_VSSE 9
2208 #define FF_CMP_NSSE 10
2209 #define FF_CMP_W53 11
2210 #define FF_CMP_W97 12
2211 #define FF_CMP_DCTMAX 13
2212 #define FF_CMP_DCT264 14
2213 #define FF_CMP_MEDIAN_SAD 15
2214 #define FF_CMP_CHROMA 256
2215 
2216  /**
2217  * ME diamond size & shape
2218  * - encoding: Set by user.
2219  * - decoding: unused
2220  */
2222 
2223  /**
2224  * amount of previous MV predictors (2a+1 x 2a+1 square)
2225  * - encoding: Set by user.
2226  * - decoding: unused
2227  */
2229 
2230 #if FF_API_PRIVATE_OPT
2231  /** @deprecated use encoder private options instead */
2233  int pre_me;
2234 #endif
2235 
2236  /**
2237  * motion estimation prepass comparison function
2238  * - encoding: Set by user.
2239  * - decoding: unused
2240  */
2242 
2243  /**
2244  * ME prepass diamond size & shape
2245  * - encoding: Set by user.
2246  * - decoding: unused
2247  */
2249 
2250  /**
2251  * subpel ME quality
2252  * - encoding: Set by user.
2253  * - decoding: unused
2254  */
2256 
2257 #if FF_API_AFD
2258  /**
2259  * DTG active format information (additional aspect ratio
2260  * information only used in DVB MPEG-2 transport streams)
2261  * 0 if not set.
2262  *
2263  * - encoding: unused
2264  * - decoding: Set by decoder.
2265  * @deprecated Deprecated in favor of AVSideData
2266  */
2268 #define FF_DTG_AFD_SAME 8
2269 #define FF_DTG_AFD_4_3 9
2270 #define FF_DTG_AFD_16_9 10
2271 #define FF_DTG_AFD_14_9 11
2272 #define FF_DTG_AFD_4_3_SP_14_9 13
2273 #define FF_DTG_AFD_16_9_SP_14_9 14
2274 #define FF_DTG_AFD_SP_4_3 15
2275 #endif /* FF_API_AFD */
2276 
2277  /**
2278  * maximum motion estimation search range in subpel units
2279  * If 0 then no limit.
2280  *
2281  * - encoding: Set by user.
2282  * - decoding: unused
2283  */
2285 
2286 #if FF_API_QUANT_BIAS
2287  /**
2288  * @deprecated use encoder private option instead
2289  */
2291 #define FF_DEFAULT_QUANT_BIAS 999999
2292 
2293  /**
2294  * @deprecated use encoder private option instead
2295  */
2297 #endif
2298 
2299  /**
2300  * slice flags
2301  * - encoding: unused
2302  * - decoding: Set by user.
2303  */
2305 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2306 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2307 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2308 
2309 #if FF_API_XVMC
2310  /**
2311  * XVideo Motion Acceleration
2312  * - encoding: forbidden
2313  * - decoding: set by decoder
2314  * @deprecated XvMC doesn't need it anymore.
2315  */
2316  attribute_deprecated int xvmc_acceleration;
2317 #endif /* FF_API_XVMC */
2318 
2319  /**
2320  * macroblock decision mode
2321  * - encoding: Set by user.
2322  * - decoding: unused
2323  */
2325 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2326 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2327 #define FF_MB_DECISION_RD 2 ///< rate distortion
2328 
2329  /**
2330  * custom intra quantization matrix
2331  * - encoding: Set by user, can be NULL.
2332  * - decoding: Set by libavcodec.
2333  */
2334  uint16_t *intra_matrix;
2335 
2336  /**
2337  * custom inter quantization matrix
2338  * - encoding: Set by user, can be NULL.
2339  * - decoding: Set by libavcodec.
2340  */
2341  uint16_t *inter_matrix;
2342 
2343 #if FF_API_PRIVATE_OPT
2344  /** @deprecated use encoder private options instead */
2347 
2348  /** @deprecated use encoder private options instead */
2351 #endif
2352 
2353 #if FF_API_MPV_OPT
2354  /**
2355  * @deprecated this field is unused
2356  */
2359 
2360  /**
2361  * @deprecated this field is unused
2362  */
2365 #endif
2366 
2367  /**
2368  * precision of the intra DC coefficient - 8
2369  * - encoding: Set by user.
2370  * - decoding: Set by libavcodec
2371  */
2373 
2374  /**
2375  * Number of macroblock rows at the top which are skipped.
2376  * - encoding: unused
2377  * - decoding: Set by user.
2378  */
2380 
2381  /**
2382  * Number of macroblock rows at the bottom which are skipped.
2383  * - encoding: unused
2384  * - decoding: Set by user.
2385  */
2387 
2388 #if FF_API_MPV_OPT
2389  /**
2390  * @deprecated use encoder private options instead
2391  */
2394 #endif
2395 
2396  /**
2397  * minimum MB Lagrange multiplier
2398  * - encoding: Set by user.
2399  * - decoding: unused
2400  */
2401  int mb_lmin;
2402 
2403  /**
2404  * maximum MB Lagrange multiplier
2405  * - encoding: Set by user.
2406  * - decoding: unused
2407  */
2408  int mb_lmax;
2409 
2410 #if FF_API_PRIVATE_OPT
2411  /**
2412  * @deprecated use encoder private options instead
2413  */
2416 #endif
2417 
2418  /**
2419  * - encoding: Set by user.
2420  * - decoding: unused
2421  */
2423 
2424 #if FF_API_PRIVATE_OPT
2425  /** @deprecated use encoder private options instead */
2428 #endif
2429 
2430  /**
2431  * minimum GOP size
2432  * - encoding: Set by user.
2433  * - decoding: unused
2434  */
2436 
2437  /**
2438  * number of reference frames
2439  * - encoding: Set by user.
2440  * - decoding: Set by lavc.
2441  */
2442  int refs;
2443 
2444 #if FF_API_PRIVATE_OPT
2445  /** @deprecated use encoder private options instead */
2448 #endif
2449 
2450 #if FF_API_UNUSED_MEMBERS
2451  /**
2452  * Multiplied by qscale for each frame and added to scene_change_score.
2453  * - encoding: Set by user.
2454  * - decoding: unused
2455  */
2457 #endif
2458 
2459  /**
2460  * Note: Value depends upon the compare function used for fullpel ME.
2461  * - encoding: Set by user.
2462  * - decoding: unused
2463  */
2465 
2466 #if FF_API_PRIVATE_OPT
2467  /** @deprecated use encoder private options instead */
2470 #endif
2471 
2472  /**
2473  * Chromaticity coordinates of the source primaries.
2474  * - encoding: Set by user
2475  * - decoding: Set by libavcodec
2476  */
2478 
2479  /**
2480  * Color Transfer Characteristic.
2481  * - encoding: Set by user
2482  * - decoding: Set by libavcodec
2483  */
2485 
2486  /**
2487  * YUV colorspace type.
2488  * - encoding: Set by user
2489  * - decoding: Set by libavcodec
2490  */
2492 
2493  /**
2494  * MPEG vs JPEG YUV range.
2495  * - encoding: Set by user
2496  * - decoding: Set by libavcodec
2497  */
2499 
2500  /**
2501  * This defines the location of chroma samples.
2502  * - encoding: Set by user
2503  * - decoding: Set by libavcodec
2504  */
2506 
2507  /**
2508  * Number of slices.
2509  * Indicates number of picture subdivisions. Used for parallelized
2510  * decoding.
2511  * - encoding: Set by user
2512  * - decoding: unused
2513  */
2514  int slices;
2515 
2516  /** Field order
2517  * - encoding: set by libavcodec
2518  * - decoding: Set by user.
2519  */
2521 
2522  /* audio only */
2523  int sample_rate; ///< samples per second
2524  int channels; ///< number of audio channels
2525 
2526  /**
2527  * audio sample format
2528  * - encoding: Set by user.
2529  * - decoding: Set by libavcodec.
2530  */
2531  enum AVSampleFormat sample_fmt; ///< sample format
2532 
2533  /* The following data should not be initialized. */
2534  /**
2535  * Number of samples per channel in an audio frame.
2536  *
2537  * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2538  * except the last must contain exactly frame_size samples per channel.
2539  * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2540  * frame size is not restricted.
2541  * - decoding: may be set by some decoders to indicate constant frame size
2542  */
2544 
2545  /**
2546  * Frame counter, set by libavcodec.
2547  *
2548  * - decoding: total number of frames returned from the decoder so far.
2549  * - encoding: total number of frames passed to the encoder so far.
2550  *
2551  * @note the counter is not incremented if encoding/decoding resulted in
2552  * an error.
2553  */
2555 
2556  /**
2557  * number of bytes per packet if constant and known or 0
2558  * Used by some WAV based audio codecs.
2559  */
2561 
2562  /**
2563  * Audio cutoff bandwidth (0 means "automatic")
2564  * - encoding: Set by user.
2565  * - decoding: unused
2566  */
2567  int cutoff;
2568 
2569  /**
2570  * Audio channel layout.
2571  * - encoding: set by user.
2572  * - decoding: set by user, may be overwritten by libavcodec.
2573  */
2574  uint64_t channel_layout;
2575 
2576  /**
2577  * Request decoder to use this channel layout if it can (0 for default)
2578  * - encoding: unused
2579  * - decoding: Set by user.
2580  */
2582 
2583  /**
2584  * Type of service that the audio stream conveys.
2585  * - encoding: Set by user.
2586  * - decoding: Set by libavcodec.
2587  */
2589 
2590  /**
2591  * desired sample format
2592  * - encoding: Not used.
2593  * - decoding: Set by user.
2594  * Decoder will decode to this format if it can.
2595  */
2597 
2598  /**
2599  * This callback is called at the beginning of each frame to get data
2600  * buffer(s) for it. There may be one contiguous buffer for all the data or
2601  * there may be a buffer per each data plane or anything in between. What
2602  * this means is, you may set however many entries in buf[] you feel necessary.
2603  * Each buffer must be reference-counted using the AVBuffer API (see description
2604  * of buf[] below).
2605  *
2606  * The following fields will be set in the frame before this callback is
2607  * called:
2608  * - format
2609  * - width, height (video only)
2610  * - sample_rate, channel_layout, nb_samples (audio only)
2611  * Their values may differ from the corresponding values in
2612  * AVCodecContext. This callback must use the frame values, not the codec
2613  * context values, to calculate the required buffer size.
2614  *
2615  * This callback must fill the following fields in the frame:
2616  * - data[]
2617  * - linesize[]
2618  * - extended_data:
2619  * * if the data is planar audio with more than 8 channels, then this
2620  * callback must allocate and fill extended_data to contain all pointers
2621  * to all data planes. data[] must hold as many pointers as it can.
2622  * extended_data must be allocated with av_malloc() and will be freed in
2623  * av_frame_unref().
2624  * * otherwise extended_data must point to data
2625  * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2626  * the frame's data and extended_data pointers must be contained in these. That
2627  * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2628  * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2629  * and av_buffer_ref().
2630  * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2631  * this callback and filled with the extra buffers if there are more
2632  * buffers than buf[] can hold. extended_buf will be freed in
2633  * av_frame_unref().
2634  *
2635  * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2636  * avcodec_default_get_buffer2() instead of providing buffers allocated by
2637  * some other means.
2638  *
2639  * Each data plane must be aligned to the maximum required by the target
2640  * CPU.
2641  *
2642  * @see avcodec_default_get_buffer2()
2643  *
2644  * Video:
2645  *
2646  * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2647  * (read and/or written to if it is writable) later by libavcodec.
2648  *
2649  * avcodec_align_dimensions2() should be used to find the required width and
2650  * height, as they normally need to be rounded up to the next multiple of 16.
2651  *
2652  * Some decoders do not support linesizes changing between frames.
2653  *
2654  * If frame multithreading is used and thread_safe_callbacks is set,
2655  * this callback may be called from a different thread, but not from more
2656  * than one at once. Does not need to be reentrant.
2657  *
2658  * @see avcodec_align_dimensions2()
2659  *
2660  * Audio:
2661  *
2662  * Decoders request a buffer of a particular size by setting
2663  * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2664  * however, utilize only part of the buffer by setting AVFrame.nb_samples
2665  * to a smaller value in the output frame.
2666  *
2667  * As a convenience, av_samples_get_buffer_size() and
2668  * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2669  * functions to find the required data size and to fill data pointers and
2670  * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2671  * since all planes must be the same size.
2672  *
2673  * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2674  *
2675  * - encoding: unused
2676  * - decoding: Set by libavcodec, user can override.
2677  */
2679 
2680  /**
2681  * If non-zero, the decoded audio and video frames returned from
2682  * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2683  * and are valid indefinitely. The caller must free them with
2684  * av_frame_unref() when they are not needed anymore.
2685  * Otherwise, the decoded frames must not be freed by the caller and are
2686  * only valid until the next decode call.
2687  *
2688  * This is always automatically enabled if avcodec_receive_frame() is used.
2689  *
2690  * - encoding: unused
2691  * - decoding: set by the caller before avcodec_open2().
2692  */
2695 
2696  /* - encoding parameters */
2697  float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2698  float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2699 
2700  /**
2701  * minimum quantizer
2702  * - encoding: Set by user.
2703  * - decoding: unused
2704  */
2705  int qmin;
2706 
2707  /**
2708  * maximum quantizer
2709  * - encoding: Set by user.
2710  * - decoding: unused
2711  */
2712  int qmax;
2713 
2714  /**
2715  * maximum quantizer difference between frames
2716  * - encoding: Set by user.
2717  * - decoding: unused
2718  */
2720 
2721 #if FF_API_MPV_OPT
2722  /**
2723  * @deprecated use encoder private options instead
2724  */
2726  float rc_qsquish;
2727 
2732 #endif
2733 
2734  /**
2735  * decoder bitstream buffer size
2736  * - encoding: Set by user.
2737  * - decoding: unused
2738  */
2740 
2741  /**
2742  * ratecontrol override, see RcOverride
2743  * - encoding: Allocated/set/freed by user.
2744  * - decoding: unused
2745  */
2748 
2749 #if FF_API_MPV_OPT
2750  /**
2751  * @deprecated use encoder private options instead
2752  */
2754  const char *rc_eq;
2755 #endif
2756 
2757  /**
2758  * maximum bitrate
2759  * - encoding: Set by user.
2760  * - decoding: Set by user, may be overwritten by libavcodec.
2761  */
2762  int64_t rc_max_rate;
2763 
2764  /**
2765  * minimum bitrate
2766  * - encoding: Set by user.
2767  * - decoding: unused
2768  */
2769  int64_t rc_min_rate;
2770 
2771 #if FF_API_MPV_OPT
2772  /**
2773  * @deprecated use encoder private options instead
2774  */
2777 
2780 #endif
2781 
2782  /**
2783  * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2784  * - encoding: Set by user.
2785  * - decoding: unused.
2786  */
2788 
2789  /**
2790  * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2791  * - encoding: Set by user.
2792  * - decoding: unused.
2793  */
2795 
2796  /**
2797  * Number of bits which should be loaded into the rc buffer before decoding starts.
2798  * - encoding: Set by user.
2799  * - decoding: unused
2800  */
2802 
2803 #if FF_API_CODER_TYPE
2804 #define FF_CODER_TYPE_VLC 0
2805 #define FF_CODER_TYPE_AC 1
2806 #define FF_CODER_TYPE_RAW 2
2807 #define FF_CODER_TYPE_RLE 3
2808 #if FF_API_UNUSED_MEMBERS
2809 #define FF_CODER_TYPE_DEFLATE 4
2810 #endif /* FF_API_UNUSED_MEMBERS */
2811  /**
2812  * @deprecated use encoder private options instead
2813  */
2816 #endif /* FF_API_CODER_TYPE */
2817 
2818 #if FF_API_PRIVATE_OPT
2819  /** @deprecated use encoder private options instead */
2822 #endif
2823 
2824 #if FF_API_MPV_OPT
2825  /**
2826  * @deprecated use encoder private options instead
2827  */
2829  int lmin;
2830 
2831  /**
2832  * @deprecated use encoder private options instead
2833  */
2835  int lmax;
2836 #endif
2837 
2838 #if FF_API_PRIVATE_OPT
2839  /** @deprecated use encoder private options instead */
2842 
2843  /** @deprecated use encoder private options instead */
2846 
2847  /** @deprecated use encoder private options instead */
2850 
2851  /** @deprecated use encoder private options instead */
2854 #endif /* FF_API_PRIVATE_OPT */
2855 
2856  /**
2857  * trellis RD quantization
2858  * - encoding: Set by user.
2859  * - decoding: unused
2860  */
2861  int trellis;
2862 
2863 #if FF_API_PRIVATE_OPT
2864  /** @deprecated use encoder private options instead */
2867 
2868  /** @deprecated use encoder private options instead */
2871 
2872  /** @deprecated use encoder private options instead */
2875 #endif
2876 
2877 #if FF_API_RTP_CALLBACK
2878  /**
2879  * @deprecated unused
2880  */
2881  /* The RTP callback: This function is called */
2882  /* every time the encoder has a packet to send. */
2883  /* It depends on the encoder if the data starts */
2884  /* with a Start Code (it should). H.263 does. */
2885  /* mb_nb contains the number of macroblocks */
2886  /* encoded in the RTP payload. */
2888  void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2889 #endif
2890 
2891 #if FF_API_PRIVATE_OPT
2892  /** @deprecated use encoder private options instead */
2894  int rtp_payload_size; /* The size of the RTP payload: the coder will */
2895  /* do its best to deliver a chunk with size */
2896  /* below rtp_payload_size, the chunk will start */
2897  /* with a start code on some codecs like H.263. */
2898  /* This doesn't take account of any particular */
2899  /* headers inside the transmitted RTP payload. */
2900 #endif
2901 
2902 #if FF_API_STAT_BITS
2903  /* statistics, used for 2-pass encoding */
2905  int mv_bits;
2913  int i_count;
2915  int p_count;
2920 
2921  /** @deprecated this field is unused */
2924 #endif
2925 
2926  /**
2927  * pass1 encoding statistics output buffer
2928  * - encoding: Set by libavcodec.
2929  * - decoding: unused
2930  */
2931  char *stats_out;
2932 
2933  /**
2934  * pass2 encoding statistics input buffer
2935  * Concatenated stuff from stats_out of pass1 should be placed here.
2936  * - encoding: Allocated/set/freed by user.
2937  * - decoding: unused
2938  */
2939  char *stats_in;
2940 
2941  /**
2942  * Work around bugs in encoders which sometimes cannot be detected automatically.
2943  * - encoding: Set by user
2944  * - decoding: Set by user
2945  */
2947 #define FF_BUG_AUTODETECT 1 ///< autodetection
2948 #if FF_API_OLD_MSMPEG4
2949 #define FF_BUG_OLD_MSMPEG4 2
2950 #endif
2951 #define FF_BUG_XVID_ILACE 4
2952 #define FF_BUG_UMP4 8
2953 #define FF_BUG_NO_PADDING 16
2954 #define FF_BUG_AMV 32
2955 #if FF_API_AC_VLC
2956 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2957 #endif
2958 #define FF_BUG_QPEL_CHROMA 64
2959 #define FF_BUG_STD_QPEL 128
2960 #define FF_BUG_QPEL_CHROMA2 256
2961 #define FF_BUG_DIRECT_BLOCKSIZE 512
2962 #define FF_BUG_EDGE 1024
2963 #define FF_BUG_HPEL_CHROMA 2048
2964 #define FF_BUG_DC_CLIP 4096
2965 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2966 #define FF_BUG_TRUNCATED 16384
2967 #define FF_BUG_IEDGE 32768
2968 
2969  /**
2970  * strictly follow the standard (MPEG-4, ...).
2971  * - encoding: Set by user.
2972  * - decoding: Set by user.
2973  * Setting this to STRICT or higher means the encoder and decoder will
2974  * generally do stupid things, whereas setting it to unofficial or lower
2975  * will mean the encoder might produce output that is not supported by all
2976  * spec-compliant decoders. Decoders don't differentiate between normal,
2977  * unofficial and experimental (that is, they always try to decode things
2978  * when they can) unless they are explicitly asked to behave stupidly
2979  * (=strictly conform to the specs)
2980  */
2982 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2983 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2984 #define FF_COMPLIANCE_NORMAL 0
2985 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2986 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2987 
2988  /**
2989  * error concealment flags
2990  * - encoding: unused
2991  * - decoding: Set by user.
2992  */
2994 #define FF_EC_GUESS_MVS 1
2995 #define FF_EC_DEBLOCK 2
2996 #define FF_EC_FAVOR_INTER 256
2997 
2998  /**
2999  * debug
3000  * - encoding: Set by user.
3001  * - decoding: Set by user.
3002  */
3003  int debug;
3004 #define FF_DEBUG_PICT_INFO 1
3005 #define FF_DEBUG_RC 2
3006 #define FF_DEBUG_BITSTREAM 4
3007 #define FF_DEBUG_MB_TYPE 8
3008 #define FF_DEBUG_QP 16
3009 #if FF_API_DEBUG_MV
3010 /**
3011  * @deprecated this option does nothing
3012  */
3013 #define FF_DEBUG_MV 32
3014 #endif
3015 #define FF_DEBUG_DCT_COEFF 0x00000040
3016 #define FF_DEBUG_SKIP 0x00000080
3017 #define FF_DEBUG_STARTCODE 0x00000100
3018 #if FF_API_UNUSED_MEMBERS
3019 #define FF_DEBUG_PTS 0x00000200
3020 #endif /* FF_API_UNUSED_MEMBERS */
3021 #define FF_DEBUG_ER 0x00000400
3022 #define FF_DEBUG_MMCO 0x00000800
3023 #define FF_DEBUG_BUGS 0x00001000
3024 #if FF_API_DEBUG_MV
3025 #define FF_DEBUG_VIS_QP 0x00002000
3026 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
3027 #endif
3028 #define FF_DEBUG_BUFFERS 0x00008000
3029 #define FF_DEBUG_THREADS 0x00010000
3030 #define FF_DEBUG_GREEN_MD 0x00800000
3031 #define FF_DEBUG_NOMC 0x01000000
3032 
3033 #if FF_API_DEBUG_MV
3034  /**
3035  * debug
3036  * - encoding: Set by user.
3037  * - decoding: Set by user.
3038  */
3040 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
3041 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
3042 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
3043 #endif
3044 
3045  /**
3046  * Error recognition; may misdetect some more or less valid parts as errors.
3047  * - encoding: unused
3048  * - decoding: Set by user.
3049  */
3051 
3052 /**
3053  * Verify checksums embedded in the bitstream (could be of either encoded or
3054  * decoded data, depending on the codec) and print an error message on mismatch.
3055  * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
3056  * decoder returning an error.
3057  */
3058 #define AV_EF_CRCCHECK (1<<0)
3059 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
3060 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
3061 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
3062 
3063 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
3064 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
3065 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
3066 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
3067 
3068 
3069  /**
3070  * opaque 64-bit number (generally a PTS) that will be reordered and
3071  * output in AVFrame.reordered_opaque
3072  * - encoding: unused
3073  * - decoding: Set by user.
3074  */
3076 
3077  /**
3078  * Hardware accelerator in use
3079  * - encoding: unused.
3080  * - decoding: Set by libavcodec
3081  */
3083 
3084  /**
3085  * Hardware accelerator context.
3086  * For some hardware accelerators, a global context needs to be
3087  * provided by the user. In that case, this holds display-dependent
3088  * data FFmpeg cannot instantiate itself. Please refer to the
3089  * FFmpeg HW accelerator documentation to know how to fill this
3090  * is. e.g. for VA API, this is a struct vaapi_context.
3091  * - encoding: unused
3092  * - decoding: Set by user
3093  */
3095 
3096  /**
3097  * error
3098  * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
3099  * - decoding: unused
3100  */
3102 
3103  /**
3104  * DCT algorithm, see FF_DCT_* below
3105  * - encoding: Set by user.
3106  * - decoding: unused
3107  */
3109 #define FF_DCT_AUTO 0
3110 #define FF_DCT_FASTINT 1
3111 #define FF_DCT_INT 2
3112 #define FF_DCT_MMX 3
3113 #define FF_DCT_ALTIVEC 5
3114 #define FF_DCT_FAAN 6
3115 
3116  /**
3117  * IDCT algorithm, see FF_IDCT_* below.
3118  * - encoding: Set by user.
3119  * - decoding: Set by user.
3120  */
3122 #define FF_IDCT_AUTO 0
3123 #define FF_IDCT_INT 1
3124 #define FF_IDCT_SIMPLE 2
3125 #define FF_IDCT_SIMPLEMMX 3
3126 #define FF_IDCT_ARM 7
3127 #define FF_IDCT_ALTIVEC 8
3128 #if FF_API_ARCH_SH4
3129 #define FF_IDCT_SH4 9
3130 #endif
3131 #define FF_IDCT_SIMPLEARM 10
3132 #if FF_API_UNUSED_MEMBERS
3133 #define FF_IDCT_IPP 13
3134 #endif /* FF_API_UNUSED_MEMBERS */
3135 #define FF_IDCT_XVID 14
3136 #if FF_API_IDCT_XVIDMMX
3137 #define FF_IDCT_XVIDMMX 14
3138 #endif /* FF_API_IDCT_XVIDMMX */
3139 #define FF_IDCT_SIMPLEARMV5TE 16
3140 #define FF_IDCT_SIMPLEARMV6 17
3141 #if FF_API_ARCH_SPARC
3142 #define FF_IDCT_SIMPLEVIS 18
3143 #endif
3144 #define FF_IDCT_FAAN 20
3145 #define FF_IDCT_SIMPLENEON 22
3146 #if FF_API_ARCH_ALPHA
3147 #define FF_IDCT_SIMPLEALPHA 23
3148 #endif
3149 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
3150 #define FF_IDCT_SIMPLEAUTO 128
3151 
3152  /**
3153  * bits per sample/pixel from the demuxer (needed for huffyuv).
3154  * - encoding: Set by libavcodec.
3155  * - decoding: Set by user.
3156  */
3158 
3159  /**
3160  * Bits per sample/pixel of internal libavcodec pixel/sample format.
3161  * - encoding: set by user.
3162  * - decoding: set by libavcodec.
3163  */
3165 
3166 #if FF_API_LOWRES
3167  /**
3168  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3169  * - encoding: unused
3170  * - decoding: Set by user.
3171  */
3172  int lowres;
3173 #endif
3174 
3175 #if FF_API_CODED_FRAME
3176  /**
3177  * the picture in the bitstream
3178  * - encoding: Set by libavcodec.
3179  * - decoding: unused
3180  *
3181  * @deprecated use the quality factor packet side data instead
3182  */
3184 #endif
3185 
3186  /**
3187  * thread count
3188  * is used to decide how many independent tasks should be passed to execute()
3189  * - encoding: Set by user.
3190  * - decoding: Set by user.
3191  */
3193 
3194  /**
3195  * Which multithreading methods to use.
3196  * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3197  * so clients which cannot provide future frames should not use it.
3198  *
3199  * - encoding: Set by user, otherwise the default is used.
3200  * - decoding: Set by user, otherwise the default is used.
3201  */
3203 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3204 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3205 
3206  /**
3207  * Which multithreading methods are in use by the codec.
3208  * - encoding: Set by libavcodec.
3209  * - decoding: Set by libavcodec.
3210  */
3212 
3213  /**
3214  * Set by the client if its custom get_buffer() callback can be called
3215  * synchronously from another thread, which allows faster multithreaded decoding.
3216  * draw_horiz_band() will be called from other threads regardless of this setting.
3217  * Ignored if the default get_buffer() is used.
3218  * - encoding: Set by user.
3219  * - decoding: Set by user.
3220  */
3222 
3223  /**
3224  * The codec may call this to execute several independent things.
3225  * It will return only after finishing all tasks.
3226  * The user may replace this with some multithreaded implementation,
3227  * the default implementation will execute the parts serially.
3228  * @param count the number of things to execute
3229  * - encoding: Set by libavcodec, user can override.
3230  * - decoding: Set by libavcodec, user can override.
3231  */
3232  int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3233 
3234  /**
3235  * The codec may call this to execute several independent things.
3236  * It will return only after finishing all tasks.
3237  * The user may replace this with some multithreaded implementation,
3238  * the default implementation will execute the parts serially.
3239  * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3240  * @param c context passed also to func
3241  * @param count the number of things to execute
3242  * @param arg2 argument passed unchanged to func
3243  * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3244  * @param func function that will be called count times, with jobnr from 0 to count-1.
3245  * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3246  * two instances of func executing at the same time will have the same threadnr.
3247  * @return always 0 currently, but code should handle a future improvement where when any call to func
3248  * returns < 0 no further calls to func may be done and < 0 is returned.
3249  * - encoding: Set by libavcodec, user can override.
3250  * - decoding: Set by libavcodec, user can override.
3251  */
3252  int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3253 
3254  /**
3255  * noise vs. sse weight for the nsse comparison function
3256  * - encoding: Set by user.
3257  * - decoding: unused
3258  */
3260 
3261  /**
3262  * profile
3263  * - encoding: Set by user.
3264  * - decoding: Set by libavcodec.
3265  */
3266  int profile;
3267 #define FF_PROFILE_UNKNOWN -99
3268 #define FF_PROFILE_RESERVED -100
3269 
3270 #define FF_PROFILE_AAC_MAIN 0
3271 #define FF_PROFILE_AAC_LOW 1
3272 #define FF_PROFILE_AAC_SSR 2
3273 #define FF_PROFILE_AAC_LTP 3
3274 #define FF_PROFILE_AAC_HE 4
3275 #define FF_PROFILE_AAC_HE_V2 28
3276 #define FF_PROFILE_AAC_LD 22
3277 #define FF_PROFILE_AAC_ELD 38
3278 #define FF_PROFILE_MPEG2_AAC_LOW 128
3279 #define FF_PROFILE_MPEG2_AAC_HE 131
3280 
3281 #define FF_PROFILE_DNXHD 0
3282 #define FF_PROFILE_DNXHR_LB 1
3283 #define FF_PROFILE_DNXHR_SQ 2
3284 #define FF_PROFILE_DNXHR_HQ 3
3285 #define FF_PROFILE_DNXHR_HQX 4
3286 #define FF_PROFILE_DNXHR_444 5
3287 
3288 #define FF_PROFILE_DTS 20
3289 #define FF_PROFILE_DTS_ES 30
3290 #define FF_PROFILE_DTS_96_24 40
3291 #define FF_PROFILE_DTS_HD_HRA 50
3292 #define FF_PROFILE_DTS_HD_MA 60
3293 #define FF_PROFILE_DTS_EXPRESS 70
3294 
3295 #define FF_PROFILE_MPEG2_422 0
3296 #define FF_PROFILE_MPEG2_HIGH 1
3297 #define FF_PROFILE_MPEG2_SS 2
3298 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3299 #define FF_PROFILE_MPEG2_MAIN 4
3300 #define FF_PROFILE_MPEG2_SIMPLE 5
3301 
3302 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3303 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3304 
3305 #define FF_PROFILE_H264_BASELINE 66
3306 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3307 #define FF_PROFILE_H264_MAIN 77
3308 #define FF_PROFILE_H264_EXTENDED 88
3309 #define FF_PROFILE_H264_HIGH 100
3310 #define FF_PROFILE_H264_HIGH_10 110
3311 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3312 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
3313 #define FF_PROFILE_H264_HIGH_422 122
3314 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3315 #define FF_PROFILE_H264_STEREO_HIGH 128
3316 #define FF_PROFILE_H264_HIGH_444 144
3317 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3318 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3319 #define FF_PROFILE_H264_CAVLC_444 44
3320 
3321 #define FF_PROFILE_VC1_SIMPLE 0
3322 #define FF_PROFILE_VC1_MAIN 1
3323 #define FF_PROFILE_VC1_COMPLEX 2
3324 #define FF_PROFILE_VC1_ADVANCED 3
3325 
3326 #define FF_PROFILE_MPEG4_SIMPLE 0
3327 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3328 #define FF_PROFILE_MPEG4_CORE 2
3329 #define FF_PROFILE_MPEG4_MAIN 3
3330 #define FF_PROFILE_MPEG4_N_BIT 4
3331 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3332 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3333 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3334 #define FF_PROFILE_MPEG4_HYBRID 8
3335 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3336 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3337 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3338 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3339 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3340 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3341 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3342 
3343 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
3344 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
3345 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3346 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3347 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3348 
3349 #define FF_PROFILE_VP9_0 0
3350 #define FF_PROFILE_VP9_1 1
3351 #define FF_PROFILE_VP9_2 2
3352 #define FF_PROFILE_VP9_3 3
3353 
3354 #define FF_PROFILE_HEVC_MAIN 1
3355 #define FF_PROFILE_HEVC_MAIN_10 2
3356 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3357 #define FF_PROFILE_HEVC_REXT 4
3358 
3359  /**
3360  * level
3361  * - encoding: Set by user.
3362  * - decoding: Set by libavcodec.
3363  */
3364  int level;
3365 #define FF_LEVEL_UNKNOWN -99
3366 
3367  /**
3368  * Skip loop filtering for selected frames.
3369  * - encoding: unused
3370  * - decoding: Set by user.
3371  */
3373 
3374  /**
3375  * Skip IDCT/dequantization for selected frames.
3376  * - encoding: unused
3377  * - decoding: Set by user.
3378  */
3380 
3381  /**
3382  * Skip decoding for selected frames.
3383  * - encoding: unused
3384  * - decoding: Set by user.
3385  */
3387 
3388  /**
3389  * Header containing style information for text subtitles.
3390  * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3391  * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3392  * the Format line following. It shouldn't include any Dialogue line.
3393  * - encoding: Set/allocated/freed by user (before avcodec_open2())
3394  * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3395  */
3398 
3399 #if FF_API_ERROR_RATE
3400  /**
3401  * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3402  * encoders
3403  */
3406 #endif
3407 
3408 #if FF_API_VBV_DELAY
3409  /**
3410  * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3411  * Used for compliant TS muxing.
3412  * - encoding: Set by libavcodec.
3413  * - decoding: unused.
3414  * @deprecated this value is now exported as a part of
3415  * AV_PKT_DATA_CPB_PROPERTIES packet side data
3416  */
3418  uint64_t vbv_delay;
3419 #endif
3420 
3421 #if FF_API_SIDEDATA_ONLY_PKT
3422  /**
3423  * Encoding only and set by default. Allow encoders to output packets
3424  * that do not contain any encoded data, only side data.
3425  *
3426  * Some encoders need to output such packets, e.g. to update some stream
3427  * parameters at the end of encoding.
3428  *
3429  * @deprecated this field disables the default behaviour and
3430  * it is kept only for compatibility.
3431  */
3434 #endif
3435 
3436  /**
3437  * Audio only. The number of "priming" samples (padding) inserted by the
3438  * encoder at the beginning of the audio. I.e. this number of leading
3439  * decoded samples must be discarded by the caller to get the original audio
3440  * without leading padding.
3441  *
3442  * - decoding: unused
3443  * - encoding: Set by libavcodec. The timestamps on the output packets are
3444  * adjusted by the encoder so that they always refer to the
3445  * first sample of the data actually contained in the packet,
3446  * including any added padding. E.g. if the timebase is
3447  * 1/samplerate and the timestamp of the first input sample is
3448  * 0, the timestamp of the first output packet will be
3449  * -initial_padding.
3450  */
3452 
3453  /**
3454  * - decoding: For codecs that store a framerate value in the compressed
3455  * bitstream, the decoder may export it here. { 0, 1} when
3456  * unknown.
3457  * - encoding: May be used to signal the framerate of CFR content to an
3458  * encoder.
3459  */
3461 
3462  /**
3463  * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3464  * - encoding: unused.
3465  * - decoding: Set by libavcodec before calling get_format()
3466  */
3468 
3469  /**
3470  * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3471  * - encoding unused.
3472  * - decoding set by user.
3473  */
3475 
3476  /**
3477  * AVCodecDescriptor
3478  * - encoding: unused.
3479  * - decoding: set by libavcodec.
3480  */
3482 
3483 #if !FF_API_LOWRES
3484  /**
3485  * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3486  * - encoding: unused
3487  * - decoding: Set by user.
3488  */
3489  int lowres;
3490 #endif
3491 
3492  /**
3493  * Current statistics for PTS correction.
3494  * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3495  * - encoding: unused
3496  */
3497  int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3498  int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3499  int64_t pts_correction_last_pts; /// PTS of the last frame
3500  int64_t pts_correction_last_dts; /// DTS of the last frame
3501 
3502  /**
3503  * Character encoding of the input subtitles file.
3504  * - decoding: set by user
3505  * - encoding: unused
3506  */
3508 
3509  /**
3510  * Subtitles character encoding mode. Formats or codecs might be adjusting
3511  * this setting (if they are doing the conversion themselves for instance).
3512  * - decoding: set by libavcodec
3513  * - encoding: unused
3514  */
3516 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3517 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3518 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3519 
3520  /**
3521  * Skip processing alpha if supported by codec.
3522  * Note that if the format uses pre-multiplied alpha (common with VP6,
3523  * and recommended due to better video quality/compression)
3524  * the image will look as if alpha-blended onto a black background.
3525  * However for formats that do not use pre-multiplied alpha
3526  * there might be serious artefacts (though e.g. libswscale currently
3527  * assumes pre-multiplied alpha anyway).
3528  *
3529  * - decoding: set by user
3530  * - encoding: unused
3531  */
3533 
3534  /**
3535  * Number of samples to skip after a discontinuity
3536  * - decoding: unused
3537  * - encoding: set by libavcodec
3538  */
3540 
3541 #if !FF_API_DEBUG_MV
3542  /**
3543  * debug motion vectors
3544  * - encoding: Set by user.
3545  * - decoding: Set by user.
3546  */
3547  int debug_mv;
3548 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3549 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3550 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3551 #endif
3552 
3553  /**
3554  * custom intra quantization matrix
3555  * - encoding: Set by user, can be NULL.
3556  * - decoding: unused.
3557  */
3559 
3560  /**
3561  * dump format separator.
3562  * can be ", " or "\n " or anything else
3563  * - encoding: Set by user.
3564  * - decoding: Set by user.
3565  */
3567 
3568  /**
3569  * ',' separated list of allowed decoders.
3570  * If NULL then all are allowed
3571  * - encoding: unused
3572  * - decoding: set by user
3573  */
3575 
3576  /**
3577  * Properties of the stream that gets decoded
3578  * - encoding: unused
3579  * - decoding: set by libavcodec
3580  */
3581  unsigned properties;
3582 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3583 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3584 
3585  /**
3586  * Additional data associated with the entire coded stream.
3587  *
3588  * - decoding: unused
3589  * - encoding: may be set by libavcodec after avcodec_open2().
3590  */
3593 
3594  /**
3595  * A reference to the AVHWFramesContext describing the input (for encoding)
3596  * or output (decoding) frames. The reference is set by the caller and
3597  * afterwards owned (and freed) by libavcodec - it should never be read by
3598  * the caller after being set.
3599  *
3600  * - decoding: This field should be set by the caller from the get_format()
3601  * callback. The previous reference (if any) will always be
3602  * unreffed by libavcodec before the get_format() call.
3603  *
3604  * If the default get_buffer2() is used with a hwaccel pixel
3605  * format, then this AVHWFramesContext will be used for
3606  * allocating the frame buffers.
3607  *
3608  * - encoding: For hardware encoders configured to use a hwaccel pixel
3609  * format, this field should be set by the caller to a reference
3610  * to the AVHWFramesContext describing input frames.
3611  * AVHWFramesContext.format must be equal to
3612  * AVCodecContext.pix_fmt.
3613  *
3614  * This field should be set before avcodec_open2() is called.
3615  */
3617 
3618  /**
3619  * Control the form of AVSubtitle.rects[N]->ass
3620  * - decoding: set by user
3621  * - encoding: unused
3622  */
3624 #define FF_SUB_TEXT_FMT_ASS 0
3625 #if FF_API_ASS_TIMING
3626 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3627 #endif
3628 
3629  /**
3630  * Audio only. The amount of padding (in samples) appended by the encoder to
3631  * the end of the audio. I.e. this number of decoded samples must be
3632  * discarded by the caller from the end of the stream to get the original
3633  * audio without any trailing padding.
3634  *
3635  * - decoding: unused
3636  * - encoding: unused
3637  */
3639 
3640  /**
3641  * The number of pixels per image to maximally accept.
3642  *
3643  * - decoding: set by user
3644  * - encoding: set by user
3645  */
3646  int64_t max_pixels;
3647 
3648  /**
3649  * A reference to the AVHWDeviceContext describing the device which will
3650  * be used by a hardware encoder/decoder. The reference is set by the
3651  * caller and afterwards owned (and freed) by libavcodec.
3652  *
3653  * This should be used if either the codec device does not require
3654  * hardware frames or any that are used are to be allocated internally by
3655  * libavcodec. If the user wishes to supply any of the frames used as
3656  * encoder input or decoder output then hw_frames_ctx should be used
3657  * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3658  * field will be ignored while decoding the associated stream segment, but
3659  * may again be used on a following one after another get_format() call.
3660  *
3661  * For both encoders and decoders this field should be set before
3662  * avcodec_open2() is called and must not be written to thereafter.
3663  *
3664  * Note that some decoders may require this field to be set initially in
3665  * order to support hw_frames_ctx at all - in that case, all frames
3666  * contexts used must be created on the same device.
3667  */
3669 
3670  /**
3671  * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3672  * decoding (if active).
3673  * - encoding: unused
3674  * - decoding: Set by user (either before avcodec_open2(), or in the
3675  * AVCodecContext.get_format callback)
3676  */
3678 
3679  /**
3680  * Video decoding only. Certain video codecs support cropping, meaning that
3681  * only a sub-rectangle of the decoded frame is intended for display. This
3682  * option controls how cropping is handled by libavcodec.
3683  *
3684  * When set to 1 (the default), libavcodec will apply cropping internally.
3685  * I.e. it will modify the output frame width/height fields and offset the
3686  * data pointers (only by as much as possible while preserving alignment, or
3687  * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3688  * the frames output by the decoder refer only to the cropped area. The
3689  * crop_* fields of the output frames will be zero.
3690  *
3691  * When set to 0, the width/height fields of the output frames will be set
3692  * to the coded dimensions and the crop_* fields will describe the cropping
3693  * rectangle. Applying the cropping is left to the caller.
3694  *
3695  * @warning When hardware acceleration with opaque output frames is used,
3696  * libavcodec is unable to apply cropping from the top/left border.
3697  *
3698  * @note when this option is set to zero, the width/height fields of the
3699  * AVCodecContext and output AVFrames have different meanings. The codec
3700  * context fields store display dimensions (with the coded dimensions in
3701  * coded_width/height), while the frame fields store the coded dimensions
3702  * (with the display dimensions being determined by the crop_* fields).
3703  */
3705 } AVCodecContext;
3706 
3709 
3712 
3713 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3714 
3715 int av_codec_get_lowres(const AVCodecContext *avctx);
3716 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3717 
3718 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3719 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3720 
3721 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3722 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3723 
3724 /**
3725  * AVProfile.
3726  */
3727 typedef struct AVProfile {
3728  int profile;
3729  const char *name; ///< short name for the profile
3730 } AVProfile;
3731 
3732 typedef struct AVCodecDefault AVCodecDefault;
3733 
3734 struct AVSubtitle;
3735 
3736 /**
3737  * AVCodec.
3738  */
3739 typedef struct AVCodec {
3740  /**
3741  * Name of the codec implementation.
3742  * The name is globally unique among encoders and among decoders (but an
3743  * encoder and a decoder can share the same name).
3744  * This is the primary way to find a codec from the user perspective.
3745  */
3746  const char *name;
3747  /**
3748  * Descriptive name for the codec, meant to be more human readable than name.
3749  * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3750  */
3751  const char *long_name;
3754  /**
3755  * Codec capabilities.
3756  * see AV_CODEC_CAP_*
3757  */
3759  const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3760  const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3761  const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3762  const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3763  const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3764  uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3765  const AVClass *priv_class; ///< AVClass for the private context
3766  const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3767 
3768  /*****************************************************************
3769  * No fields below this line are part of the public API. They
3770  * may not be used outside of libavcodec and can be changed and
3771  * removed at will.
3772  * New public fields should be added right above.
3773  *****************************************************************
3774  */
3776  struct AVCodec *next;
3777  /**
3778  * @name Frame-level threading support functions
3779  * @{
3780  */
3781  /**
3782  * If defined, called on thread contexts when they are created.
3783  * If the codec allocates writable tables in init(), re-allocate them here.
3784  * priv_data will be set to a copy of the original.
3785  */
3787  /**
3788  * Copy necessary context variables from a previous thread context to the current one.
3789  * If not defined, the next thread will start automatically; otherwise, the codec
3790  * must call ff_thread_finish_setup().
3791  *
3792  * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3793  */
3795  /** @} */
3796 
3797  /**
3798  * Private codec-specific defaults.
3799  */
3801 
3802  /**
3803  * Initialize codec static data, called from avcodec_register().
3804  */
3805  void (*init_static_data)(struct AVCodec *codec);
3806 
3808  int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3809  const struct AVSubtitle *sub);
3810  /**
3811  * Encode data to an AVPacket.
3812  *
3813  * @param avctx codec context
3814  * @param avpkt output AVPacket (may contain a user-provided buffer)
3815  * @param[in] frame AVFrame containing the raw data to be encoded
3816  * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3817  * non-empty packet was returned in avpkt.
3818  * @return 0 on success, negative error code on failure
3819  */
3820  int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3821  int *got_packet_ptr);
3822  int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3824  /**
3825  * Encode API with decoupled packet/frame dataflow. The API is the
3826  * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3827  * that:
3828  * - never called if the codec is closed or the wrong type,
3829  * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3830  * - only one drain frame is ever passed down,
3831  */
3834 
3835  /**
3836  * Decode API with decoupled packet/frame dataflow. This function is called
3837  * to get one output frame. It should call ff_decode_get_packet() to obtain
3838  * input data.
3839  */
3841  /**
3842  * Flush buffers.
3843  * Will be called when seeking
3844  */
3846  /**
3847  * Internal codec capabilities.
3848  * See FF_CODEC_CAP_* in internal.h
3849  */
3851 
3852  /**
3853  * Decoding only, a comma-separated list of bitstream filters to apply to
3854  * packets before decoding.
3855  */
3856  const char *bsfs;
3857 } AVCodec;
3858 
3859 int av_codec_get_max_lowres(const AVCodec *codec);
3860 
3861 struct MpegEncContext;
3862 
3863 /**
3864  * @defgroup lavc_hwaccel AVHWAccel
3865  * @{
3866  */
3867 typedef struct AVHWAccel {
3868  /**
3869  * Name of the hardware accelerated codec.
3870  * The name is globally unique among encoders and among decoders (but an
3871  * encoder and a decoder can share the same name).
3872  */
3873  const char *name;
3874 
3875  /**
3876  * Type of codec implemented by the hardware accelerator.
3877  *
3878  * See AVMEDIA_TYPE_xxx
3879  */
3881 
3882  /**
3883  * Codec implemented by the hardware accelerator.
3884  *
3885  * See AV_CODEC_ID_xxx
3886  */
3888 
3889  /**
3890  * Supported pixel format.
3891  *
3892  * Only hardware accelerated formats are supported here.
3893  */
3895 
3896  /**
3897  * Hardware accelerated codec capabilities.
3898  * see AV_HWACCEL_CODEC_CAP_*
3899  */
3901 
3902  /*****************************************************************
3903  * No fields below this line are part of the public API. They
3904  * may not be used outside of libavcodec and can be changed and
3905  * removed at will.
3906  * New public fields should be added right above.
3907  *****************************************************************
3908  */
3909  struct AVHWAccel *next;
3910 
3911  /**
3912  * Allocate a custom buffer
3913  */
3915 
3916  /**
3917  * Called at the beginning of each frame or field picture.
3918  *
3919  * Meaningful frame information (codec specific) is guaranteed to
3920  * be parsed at this point. This function is mandatory.
3921  *
3922  * Note that buf can be NULL along with buf_size set to 0.
3923  * Otherwise, this means the whole frame is available at this point.
3924  *
3925  * @param avctx the codec context
3926  * @param buf the frame data buffer base
3927  * @param buf_size the size of the frame in bytes
3928  * @return zero if successful, a negative value otherwise
3929  */
3930  int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3931 
3932  /**
3933  * Callback for each slice.
3934  *
3935  * Meaningful slice information (codec specific) is guaranteed to
3936  * be parsed at this point. This function is mandatory.
3937  * The only exception is XvMC, that works on MB level.
3938  *
3939  * @param avctx the codec context
3940  * @param buf the slice data buffer base
3941  * @param buf_size the size of the slice in bytes
3942  * @return zero if successful, a negative value otherwise
3943  */
3944  int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3945 
3946  /**
3947  * Called at the end of each frame or field picture.
3948  *
3949  * The whole picture is parsed at this point and can now be sent
3950  * to the hardware accelerator. This function is mandatory.
3951  *
3952  * @param avctx the codec context
3953  * @return zero if successful, a negative value otherwise
3954  */
3956 
3957  /**
3958  * Size of per-frame hardware accelerator private data.
3959  *
3960  * Private data is allocated with av_mallocz() before
3961  * AVCodecContext.get_buffer() and deallocated after
3962  * AVCodecContext.release_buffer().
3963  */
3965 
3966  /**
3967  * Called for every Macroblock in a slice.
3968  *
3969  * XvMC uses it to replace the ff_mpv_reconstruct_mb().
3970  * Instead of decoding to raw picture, MB parameters are
3971  * stored in an array provided by the video driver.
3972  *
3973  * @param s the mpeg context
3974  */
3976 
3977  /**
3978  * Initialize the hwaccel private data.
3979  *
3980  * This will be called from ff_get_format(), after hwaccel and
3981  * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3982  * is allocated.
3983  */
3985 
3986  /**
3987  * Uninitialize the hwaccel private data.
3988  *
3989  * This will be called from get_format() or avcodec_close(), after hwaccel
3990  * and hwaccel_context are already uninitialized.
3991  */
3993 
3994  /**
3995  * Size of the private data to allocate in
3996  * AVCodecInternal.hwaccel_priv_data.
3997  */
3999 
4000  /**
4001  * Internal hwaccel capabilities.
4002  */
4004 } AVHWAccel;
4005 
4006 /**
4007  * HWAccel is experimental and is thus avoided in favor of non experimental
4008  * codecs
4009  */
4010 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
4011 
4012 /**
4013  * Hardware acceleration should be used for decoding even if the codec level
4014  * used is unknown or higher than the maximum supported level reported by the
4015  * hardware driver.
4016  *
4017  * It's generally a good idea to pass this flag unless you have a specific
4018  * reason not to, as hardware tends to under-report supported levels.
4019  */
4020 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
4021 
4022 /**
4023  * Hardware acceleration can output YUV pixel formats with a different chroma
4024  * sampling than 4:2:0 and/or other than 8 bits per component.
4025  */
4026 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
4027 
4028 /**
4029  * Hardware acceleration should still be attempted for decoding when the
4030  * codec profile does not match the reported capabilities of the hardware.
4031  *
4032  * For example, this can be used to try to decode baseline profile H.264
4033  * streams in hardware - it will often succeed, because many streams marked
4034  * as baseline profile actually conform to constrained baseline profile.
4035  *
4036  * @warning If the stream is actually not supported then the behaviour is
4037  * undefined, and may include returning entirely incorrect output
4038  * while indicating success.
4039  */
4040 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
4041 
4042 /**
4043  * @}
4044  */
4045 
4046 #if FF_API_AVPICTURE
4047 /**
4048  * @defgroup lavc_picture AVPicture
4049  *
4050  * Functions for working with AVPicture
4051  * @{
4052  */
4053 
4054 /**
4055  * Picture data structure.
4056  *
4057  * Up to four components can be stored into it, the last component is
4058  * alpha.
4059  * @deprecated use AVFrame or imgutils functions instead
4060  */
4061 typedef struct AVPicture {
4063  uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
4065  int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
4066 } AVPicture;
4067 
4068 /**
4069  * @}
4070  */
4071 #endif
4072 
4075 
4076  SUBTITLE_BITMAP, ///< A bitmap, pict will be set
4077 
4078  /**
4079  * Plain text, the text field must be set by the decoder and is
4080  * authoritative. ass and pict fields may contain approximations.
4081  */
4083 
4084  /**
4085  * Formatted text, the ass field must be set by the decoder and is
4086  * authoritative. pict and text fields may contain approximations.
4087  */
4089 };
4090 
4091 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
4092 
4093 typedef struct AVSubtitleRect {
4094  int x; ///< top left corner of pict, undefined when pict is not set
4095  int y; ///< top left corner of pict, undefined when pict is not set
4096  int w; ///< width of pict, undefined when pict is not set
4097  int h; ///< height of pict, undefined when pict is not set
4098  int nb_colors; ///< number of colors in pict, undefined when pict is not set
4099 
4100 #if FF_API_AVPICTURE
4101  /**
4102  * @deprecated unused
4103  */
4106 #endif
4107  /**
4108  * data+linesize for the bitmap of this subtitle.
4109  * Can be set for text/ass as well once they are rendered.
4110  */
4112  int linesize[4];
4113 
4115 
4116  char *text; ///< 0 terminated plain UTF-8 text
4117 
4118  /**
4119  * 0 terminated ASS/SSA compatible event line.
4120  * The presentation of this is unaffected by the other values in this
4121  * struct.
4122  */
4123  char *ass;
4124 
4125  int flags;
4126 } AVSubtitleRect;
4127 
4128 typedef struct AVSubtitle {
4129  uint16_t format; /* 0 = graphics */
4130  uint32_t start_display_time; /* relative to packet pts, in ms */
4131  uint32_t end_display_time; /* relative to packet pts, in ms */
4132  unsigned num_rects;
4134  int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
4135 } AVSubtitle;
4136 
4137 /**
4138  * This struct describes the properties of an encoded stream.
4139  *
4140  * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
4141  * be allocated with avcodec_parameters_alloc() and freed with
4142  * avcodec_parameters_free().
4143  */
4144 typedef struct AVCodecParameters {
4145  /**
4146  * General type of the encoded data.
4147  */
4149  /**
4150  * Specific type of the encoded data (the codec used).
4151  */
4153  /**
4154  * Additional information about the codec (corresponds to the AVI FOURCC).
4155  */
4156  uint32_t codec_tag;
4157 
4158  /**
4159  * Extra binary data needed for initializing the decoder, codec-dependent.
4160  *
4161  * Must be allocated with av_malloc() and will be freed by
4162  * avcodec_parameters_free(). The allocated size of extradata must be at
4163  * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4164  * bytes zeroed.
4165  */
4167  /**
4168  * Size of the extradata content in bytes.
4169  */
4171 
4172  /**
4173  * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4174  * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4175  */
4176  int format;
4177 
4178  /**
4179  * The average bitrate of the encoded data (in bits per second).
4180  */
4181  int64_t bit_rate;
4182 
4183  /**
4184  * The number of bits per sample in the codedwords.
4185  *
4186  * This is basically the bitrate per sample. It is mandatory for a bunch of
4187  * formats to actually decode them. It's the number of bits for one sample in
4188  * the actual coded bitstream.
4189  *
4190  * This could be for example 4 for ADPCM
4191  * For PCM formats this matches bits_per_raw_sample
4192  * Can be 0
4193  */
4195 
4196  /**
4197  * This is the number of valid bits in each output sample. If the
4198  * sample format has more bits, the least significant bits are additional
4199  * padding bits, which are always 0. Use right shifts to reduce the sample
4200  * to its actual size. For example, audio formats with 24 bit samples will
4201  * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4202  * To get the original sample use "(int32_t)sample >> 8"."
4203  *
4204  * For ADPCM this might be 12 or 16 or similar
4205  * Can be 0
4206  */
4208 
4209  /**
4210  * Codec-specific bitstream restrictions that the stream conforms to.
4211  */
4212  int profile;
4213  int level;
4214 
4215  /**
4216  * Video only. The dimensions of the video frame in pixels.
4217  */
4218  int width;
4219  int height;
4220 
4221  /**
4222  * Video only. The aspect ratio (width / height) which a single pixel
4223  * should have when displayed.
4224  *
4225  * When the aspect ratio is unknown / undefined, the numerator should be
4226  * set to 0 (the denominator may have any value).
4227  */
4229 
4230  /**
4231  * Video only. The order of the fields in interlaced video.
4232  */
4234 
4235  /**
4236  * Video only. Additional colorspace characteristics.
4237  */
4243 
4244  /**
4245  * Video only. Number of delayed frames.
4246  */
4248 
4249  /**
4250  * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4251  * unknown or unspecified, otherwise the number of bits set must be equal to
4252  * the channels field.
4253  */
4254  uint64_t channel_layout;
4255  /**
4256  * Audio only. The number of audio channels.
4257  */
4259  /**
4260  * Audio only. The number of audio samples per second.
4261  */
4263  /**
4264  * Audio only. The number of bytes per coded audio frame, required by some
4265  * formats.
4266  *
4267  * Corresponds to nBlockAlign in WAVEFORMATEX.
4268  */
4270  /**
4271  * Audio only. Audio frame size, if known. Required by some formats to be static.
4272  */
4274 
4275  /**
4276  * Audio only. The amount of padding (in samples) inserted by the encoder at
4277  * the beginning of the audio. I.e. this number of leading decoded samples
4278  * must be discarded by the caller to get the original audio without leading
4279  * padding.
4280  */
4282  /**
4283  * Audio only. The amount of padding (in samples) appended by the encoder to
4284  * the end of the audio. I.e. this number of decoded samples must be
4285  * discarded by the caller from the end of the stream to get the original
4286  * audio without any trailing padding.
4287  */
4289  /**
4290  * Audio only. Number of samples to skip after a discontinuity.
4291  */
4294 
4295 /**
4296  * If c is NULL, returns the first registered codec,
4297  * if c is non-NULL, returns the next registered codec after c,
4298  * or NULL if c is the last one.
4299  */
4300 AVCodec *av_codec_next(const AVCodec *c);
4301 
4302 /**
4303  * Return the LIBAVCODEC_VERSION_INT constant.
4304  */
4305 unsigned avcodec_version(void);
4306 
4307 /**
4308  * Return the libavcodec build-time configuration.
4309  */
4310 const char *avcodec_configuration(void);
4311 
4312 /**
4313  * Return the libavcodec license.
4314  */
4315 const char *avcodec_license(void);
4316 
4317 /**
4318  * Register the codec codec and initialize libavcodec.
4319  *
4320  * @warning either this function or avcodec_register_all() must be called
4321  * before any other libavcodec functions.
4322  *
4323  * @see avcodec_register_all()
4324  */
4325 void avcodec_register(AVCodec *codec);
4326 
4327 /**
4328  * Register all the codecs, parsers and bitstream filters which were enabled at
4329  * configuration time. If you do not call this function you can select exactly
4330  * which formats you want to support, by using the individual registration
4331  * functions.
4332  *
4333  * @see avcodec_register
4334  * @see av_register_codec_parser
4335  * @see av_register_bitstream_filter
4336  */
4337 void avcodec_register_all(void);
4338 
4339 /**
4340  * Allocate an AVCodecContext and set its fields to default values. The
4341  * resulting struct should be freed with avcodec_free_context().
4342  *
4343  * @param codec if non-NULL, allocate private data and initialize defaults
4344  * for the given codec. It is illegal to then call avcodec_open2()
4345  * with a different codec.
4346  * If NULL, then the codec-specific defaults won't be initialized,
4347  * which may result in suboptimal default settings (this is
4348  * important mainly for encoders, e.g. libx264).
4349  *
4350  * @return An AVCodecContext filled with default values or NULL on failure.
4351  */
4353 
4354 /**
4355  * Free the codec context and everything associated with it and write NULL to
4356  * the provided pointer.
4357  */
4358 void avcodec_free_context(AVCodecContext **avctx);
4359 
4360 #if FF_API_GET_CONTEXT_DEFAULTS
4361 /**
4362  * @deprecated This function should not be used, as closing and opening a codec
4363  * context multiple time is not supported. A new codec context should be
4364  * allocated for each new use.
4365  */
4367 #endif
4368 
4369 /**
4370  * Get the AVClass for AVCodecContext. It can be used in combination with
4371  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4372  *
4373  * @see av_opt_find().
4374  */
4375 const AVClass *avcodec_get_class(void);
4376 
4377 #if FF_API_COPY_CONTEXT
4378 /**
4379  * Get the AVClass for AVFrame. It can be used in combination with
4380  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4381  *
4382  * @see av_opt_find().
4383  */
4384 const AVClass *avcodec_get_frame_class(void);
4385 
4386 /**
4387  * Get the AVClass for AVSubtitleRect. It can be used in combination with
4388  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4389  *
4390  * @see av_opt_find().
4391  */
4393 
4394 /**
4395  * Copy the settings of the source AVCodecContext into the destination
4396  * AVCodecContext. The resulting destination codec context will be
4397  * unopened, i.e. you are required to call avcodec_open2() before you
4398  * can use this AVCodecContext to decode/encode video/audio data.
4399  *
4400  * @param dest target codec context, should be initialized with
4401  * avcodec_alloc_context3(NULL), but otherwise uninitialized
4402  * @param src source codec context
4403  * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4404  *
4405  * @deprecated The semantics of this function are ill-defined and it should not
4406  * be used. If you need to transfer the stream parameters from one codec context
4407  * to another, use an intermediate AVCodecParameters instance and the
4408  * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4409  * functions.
4410  */
4413 #endif
4414 
4415 /**
4416  * Allocate a new AVCodecParameters and set its fields to default values
4417  * (unknown/invalid/0). The returned struct must be freed with
4418  * avcodec_parameters_free().
4419  */
4421 
4422 /**
4423  * Free an AVCodecParameters instance and everything associated with it and
4424  * write NULL to the supplied pointer.
4425  */
4427 
4428 /**
4429  * Copy the contents of src to dst. Any allocated fields in dst are freed and
4430  * replaced with newly allocated duplicates of the corresponding fields in src.
4431  *
4432  * @return >= 0 on success, a negative AVERROR code on failure.
4433  */
4435 
4436 /**
4437  * Fill the parameters struct based on the values from the supplied codec
4438  * context. Any allocated fields in par are freed and replaced with duplicates
4439  * of the corresponding fields in codec.
4440  *
4441  * @return >= 0 on success, a negative AVERROR code on failure
4442  */
4444  const AVCodecContext *codec);
4445 
4446 /**
4447  * Fill the codec context based on the values from the supplied codec
4448  * parameters. Any allocated fields in codec that have a corresponding field in
4449  * par are freed and replaced with duplicates of the corresponding field in par.
4450  * Fields in codec that do not have a counterpart in par are not touched.
4451  *
4452  * @return >= 0 on success, a negative AVERROR code on failure.
4453  */
4455  const AVCodecParameters *par);
4456 
4457 /**
4458  * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4459  * function the context has to be allocated with avcodec_alloc_context3().
4460  *
4461  * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4462  * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4463  * retrieving a codec.
4464  *
4465  * @warning This function is not thread safe!
4466  *
4467  * @note Always call this function before using decoding routines (such as
4468  * @ref avcodec_receive_frame()).
4469  *
4470  * @code
4471  * avcodec_register_all();
4472  * av_dict_set(&opts, "b", "2.5M", 0);
4473  * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4474  * if (!codec)
4475  * exit(1);
4476  *
4477  * context = avcodec_alloc_context3(codec);
4478  *
4479  * if (avcodec_open2(context, codec, opts) < 0)
4480  * exit(1);
4481  * @endcode
4482  *
4483  * @param avctx The context to initialize.
4484  * @param codec The codec to open this context for. If a non-NULL codec has been
4485  * previously passed to avcodec_alloc_context3() or
4486  * for this context, then this parameter MUST be either NULL or
4487  * equal to the previously passed codec.
4488  * @param options A dictionary filled with AVCodecContext and codec-private options.
4489  * On return this object will be filled with options that were not found.
4490  *
4491  * @return zero on success, a negative value on error
4492  * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4493  * av_dict_set(), av_opt_find().
4494  */
4495 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4496 
4497 /**
4498  * Close a given AVCodecContext and free all the data associated with it
4499  * (but not the AVCodecContext itself).
4500  *
4501  * Calling this function on an AVCodecContext that hasn't been opened will free
4502  * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4503  * codec. Subsequent calls will do nothing.
4504  *
4505  * @note Do not use this function. Use avcodec_free_context() to destroy a
4506  * codec context (either open or closed). Opening and closing a codec context
4507  * multiple times is not supported anymore -- use multiple codec contexts
4508  * instead.
4509  */
4510 int avcodec_close(AVCodecContext *avctx);
4511 
4512 /**
4513  * Free all allocated data in the given subtitle struct.
4514  *
4515  * @param sub AVSubtitle to free.
4516  */
4517 void avsubtitle_free(AVSubtitle *sub);
4518 
4519 /**
4520  * @}
4521  */
4522 
4523 /**
4524  * @addtogroup lavc_packet
4525  * @{
4526  */
4527 
4528 /**
4529  * Allocate an AVPacket and set its fields to default values. The resulting
4530  * struct must be freed using av_packet_free().
4531  *
4532  * @return An AVPacket filled with default values or NULL on failure.
4533  *
4534  * @note this only allocates the AVPacket itself, not the data buffers. Those
4535  * must be allocated through other means such as av_new_packet.
4536  *
4537  * @see av_new_packet
4538  */
4539 AVPacket *av_packet_alloc(void);
4540 
4541 /**
4542  * Create a new packet that references the same data as src.
4543  *
4544  * This is a shortcut for av_packet_alloc()+av_packet_ref().
4545  *
4546  * @return newly created AVPacket on success, NULL on error.
4547  *
4548  * @see av_packet_alloc
4549  * @see av_packet_ref
4550  */
4552 
4553 /**
4554  * Free the packet, if the packet is reference counted, it will be
4555  * unreferenced first.
4556  *
4557  * @param pkt packet to be freed. The pointer will be set to NULL.
4558  * @note passing NULL is a no-op.
4559  */
4560 void av_packet_free(AVPacket **pkt);
4561 
4562 /**
4563  * Initialize optional fields of a packet with default values.
4564  *
4565  * Note, this does not touch the data and size members, which have to be
4566  * initialized separately.
4567  *
4568  * @param pkt packet
4569  */
4570 void av_init_packet(AVPacket *pkt);
4571 
4572 /**
4573  * Allocate the payload of a packet and initialize its fields with
4574  * default values.
4575  *
4576  * @param pkt packet
4577  * @param size wanted payload size
4578  * @return 0 if OK, AVERROR_xxx otherwise
4579  */
4580 int av_new_packet(AVPacket *pkt, int size);
4581 
4582 /**
4583  * Reduce packet size, correctly zeroing padding
4584  *
4585  * @param pkt packet
4586  * @param size new size
4587  */
4588 void av_shrink_packet(AVPacket *pkt, int size);
4589 
4590 /**
4591  * Increase packet size, correctly zeroing padding
4592  *
4593  * @param pkt packet
4594  * @param grow_by number of bytes by which to increase the size of the packet
4595  */
4596 int av_grow_packet(AVPacket *pkt, int grow_by);
4597 
4598 /**
4599  * Initialize a reference-counted packet from av_malloc()ed data.
4600  *
4601  * @param pkt packet to be initialized. This function will set the data, size,
4602  * buf and destruct fields, all others are left untouched.
4603  * @param data Data allocated by av_malloc() to be used as packet data. If this
4604  * function returns successfully, the data is owned by the underlying AVBuffer.
4605  * The caller may not access the data through other means.
4606  * @param size size of data in bytes, without the padding. I.e. the full buffer
4607  * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4608  *
4609  * @return 0 on success, a negative AVERROR on error
4610  */
4612 
4613 #if FF_API_AVPACKET_OLD_API
4614 /**
4615  * @warning This is a hack - the packet memory allocation stuff is broken. The
4616  * packet is allocated if it was not really allocated.
4617  *
4618  * @deprecated Use av_packet_ref
4619  */
4621 int av_dup_packet(AVPacket *pkt);
4622 /**
4623  * Copy packet, including contents
4624  *
4625  * @return 0 on success, negative AVERROR on fail
4626  *
4627  * @deprecated Use av_packet_ref
4628  */
4630 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4631 
4632 /**
4633  * Copy packet side data
4634  *
4635  * @return 0 on success, negative AVERROR on fail
4636  *
4637  * @deprecated Use av_packet_copy_props
4638  */
4640 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4641 
4642 /**
4643  * Free a packet.
4644  *
4645  * @deprecated Use av_packet_unref
4646  *
4647  * @param pkt packet to free
4648  */
4650 void av_free_packet(AVPacket *pkt);
4651 #endif
4652 /**
4653  * Allocate new information of a packet.
4654  *
4655  * @param pkt packet
4656  * @param type side information type
4657  * @param size side information size
4658  * @return pointer to fresh allocated data or NULL otherwise
4659  */
4661  int size);
4662 
4663 /**
4664  * Wrap an existing array as a packet side data.
4665  *
4666  * @param pkt packet
4667  * @param type side information type
4668  * @param data the side data array. It must be allocated with the av_malloc()
4669  * family of functions. The ownership of the data is transferred to
4670  * pkt.
4671  * @param size side information size
4672  * @return a non-negative number on success, a negative AVERROR code on
4673  * failure. On failure, the packet is unchanged and the data remains
4674  * owned by the caller.
4675  */
4677  uint8_t *data, size_t size);
4678 
4679 /**
4680  * Shrink the already allocated side data buffer
4681  *
4682  * @param pkt packet
4683  * @param type side information type
4684  * @param size new side information size
4685  * @return 0 on success, < 0 on failure
4686  */
4688  int size);
4689 
4690 /**
4691  * Get side information from packet.
4692  *
4693  * @param pkt packet
4694  * @param type desired side information type
4695  * @param size pointer for side information size to store (optional)
4696  * @return pointer to data if present or NULL otherwise
4697  */
4699  int *size);
4700 
4701 #if FF_API_MERGE_SD_API
4704 
4707 #endif
4708 
4710 
4711 /**
4712  * Pack a dictionary for use in side_data.
4713  *
4714  * @param dict The dictionary to pack.
4715  * @param size pointer to store the size of the returned data
4716  * @return pointer to data if successful, NULL otherwise
4717  */
4719 /**
4720  * Unpack a dictionary from side_data.
4721  *
4722  * @param data data from side_data
4723  * @param size size of the data
4724  * @param dict the metadata storage dictionary
4725  * @return 0 on success, < 0 on failure
4726  */
4727 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4728 
4729 
4730 /**
4731  * Convenience function to free all the side data stored.
4732  * All the other fields stay untouched.
4733  *
4734  * @param pkt packet
4735  */
4737 
4738 /**
4739  * Setup a new reference to the data described by a given packet
4740  *
4741  * If src is reference-counted, setup dst as a new reference to the
4742  * buffer in src. Otherwise allocate a new buffer in dst and copy the
4743  * data from src into it.
4744  *
4745  * All the other fields are copied from src.
4746  *
4747  * @see av_packet_unref
4748  *
4749  * @param dst Destination packet
4750  * @param src Source packet
4751  *
4752  * @return 0 on success, a negative AVERROR on error.
4753  */
4754 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4755 
4756 /**
4757  * Wipe the packet.
4758  *
4759  * Unreference the buffer referenced by the packet and reset the
4760  * remaining packet fields to their default values.
4761  *
4762  * @param pkt The packet to be unreferenced.
4763  */
4765 
4766 /**
4767  * Move every field in src to dst and reset src.
4768  *
4769  * @see av_packet_unref
4770  *
4771  * @param src Source packet, will be reset
4772  * @param dst Destination packet
4773  */
4775 
4776 /**
4777  * Copy only "properties" fields from src to dst.
4778  *
4779  * Properties for the purpose of this function are all the fields
4780  * beside those related to the packet data (buf, data, size)
4781  *
4782  * @param dst Destination packet
4783  * @param src Source packet
4784  *
4785  * @return 0 on success AVERROR on failure.
4786  */
4787 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4788 
4789 /**
4790  * Convert valid timing fields (timestamps / durations) in a packet from one
4791  * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4792  * ignored.
4793  *
4794  * @param pkt packet on which the conversion will be performed
4795  * @param tb_src source timebase, in which the timing fields in pkt are
4796  * expressed
4797  * @param tb_dst destination timebase, to which the timing fields will be
4798  * converted
4799  */
4800 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4801 
4802 /**
4803  * @}
4804  */
4805 
4806 /**
4807  * @addtogroup lavc_decoding
4808  * @{
4809  */
4810 
4811 /**
4812  * Find a registered decoder with a matching codec ID.
4813  *
4814  * @param id AVCodecID of the requested decoder
4815  * @return A decoder if one was found, NULL otherwise.
4816  */
4818 
4819 /**
4820  * Find a registered decoder with the specified name.
4821  *
4822  * @param name name of the requested decoder
4823  * @return A decoder if one was found, NULL otherwise.
4824  */
4826 
4827 /**
4828  * The default callback for AVCodecContext.get_buffer2(). It is made public so
4829  * it can be called by custom get_buffer2() implementations for decoders without
4830  * AV_CODEC_CAP_DR1 set.
4831  */
4833 
4834 #if FF_API_EMU_EDGE
4835 /**
4836  * Return the amount of padding in pixels which the get_buffer callback must
4837  * provide around the edge of the image for codecs which do not have the
4838  * CODEC_FLAG_EMU_EDGE flag.
4839  *
4840  * @return Required padding in pixels.
4841  *
4842  * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4843  * needed
4844  */
4846 unsigned avcodec_get_edge_width(void);
4847 #endif
4848 
4849 /**
4850  * Modify width and height values so that they will result in a memory
4851  * buffer that is acceptable for the codec if you do not use any horizontal
4852  * padding.
4853  *
4854  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4855  */
4857 
4858 /**
4859  * Modify width and height values so that they will result in a memory
4860  * buffer that is acceptable for the codec if you also ensure that all
4861  * line sizes are a multiple of the respective linesize_align[i].
4862  *
4863  * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4864  */
4866  int linesize_align[AV_NUM_DATA_POINTERS]);
4867 
4868 /**
4869  * Converts AVChromaLocation to swscale x/y chroma position.
4870  *
4871  * The positions represent the chroma (0,0) position in a coordinates system
4872  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4873  *
4874  * @param xpos horizontal chroma sample position
4875  * @param ypos vertical chroma sample position
4876  */
4877 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4878 
4879 /**
4880  * Converts swscale x/y chroma position to AVChromaLocation.
4881  *
4882  * The positions represent the chroma (0,0) position in a coordinates system
4883  * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4884  *
4885  * @param xpos horizontal chroma sample position
4886  * @param ypos vertical chroma sample position
4887  */
4888 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4889 
4890 /**
4891  * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4892  *
4893  * Some decoders may support multiple frames in a single AVPacket. Such
4894  * decoders would then just decode the first frame and the return value would be
4895  * less than the packet size. In this case, avcodec_decode_audio4 has to be
4896  * called again with an AVPacket containing the remaining data in order to
4897  * decode the second frame, etc... Even if no frames are returned, the packet
4898  * needs to be fed to the decoder with remaining data until it is completely
4899  * consumed or an error occurs.
4900  *
4901  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4902  * and output. This means that for some packets they will not immediately
4903  * produce decoded output and need to be flushed at the end of decoding to get
4904  * all the decoded data. Flushing is done by calling this function with packets
4905  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4906  * returning samples. It is safe to flush even those decoders that are not
4907  * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4908  *
4909  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4910  * larger than the actual read bytes because some optimized bitstream
4911  * readers read 32 or 64 bits at once and could read over the end.
4912  *
4913  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4914  * before packets may be fed to the decoder.
4915  *
4916  * @param avctx the codec context
4917  * @param[out] frame The AVFrame in which to store decoded audio samples.
4918  * The decoder will allocate a buffer for the decoded frame by
4919  * calling the AVCodecContext.get_buffer2() callback.
4920  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4921  * reference counted and the returned reference belongs to the
4922  * caller. The caller must release the frame using av_frame_unref()
4923  * when the frame is no longer needed. The caller may safely write
4924  * to the frame if av_frame_is_writable() returns 1.
4925  * When AVCodecContext.refcounted_frames is set to 0, the returned
4926  * reference belongs to the decoder and is valid only until the
4927  * next call to this function or until closing or flushing the
4928  * decoder. The caller may not write to it.
4929  * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4930  * non-zero. Note that this field being set to zero
4931  * does not mean that an error has occurred. For
4932  * decoders with AV_CODEC_CAP_DELAY set, no given decode
4933  * call is guaranteed to produce a frame.
4934  * @param[in] avpkt The input AVPacket containing the input buffer.
4935  * At least avpkt->data and avpkt->size should be set. Some
4936  * decoders might also require additional fields to be set.
4937  * @return A negative error code is returned if an error occurred during
4938  * decoding, otherwise the number of bytes consumed from the input
4939  * AVPacket is returned.
4940  *
4941 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4942  */
4945  int *got_frame_ptr, const AVPacket *avpkt);
4946 
4947 /**
4948  * Decode the video frame of size avpkt->size from avpkt->data into picture.
4949  * Some decoders may support multiple frames in a single AVPacket, such
4950  * decoders would then just decode the first frame.
4951  *
4952  * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4953  * the actual read bytes because some optimized bitstream readers read 32 or 64
4954  * bits at once and could read over the end.
4955  *
4956  * @warning The end of the input buffer buf should be set to 0 to ensure that
4957  * no overreading happens for damaged MPEG streams.
4958  *
4959  * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4960  * between input and output, these need to be fed with avpkt->data=NULL,
4961  * avpkt->size=0 at the end to return the remaining frames.
4962  *
4963  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4964  * before packets may be fed to the decoder.
4965  *
4966  * @param avctx the codec context
4967  * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4968  * Use av_frame_alloc() to get an AVFrame. The codec will
4969  * allocate memory for the actual bitmap by calling the
4970  * AVCodecContext.get_buffer2() callback.
4971  * When AVCodecContext.refcounted_frames is set to 1, the frame is
4972  * reference counted and the returned reference belongs to the
4973  * caller. The caller must release the frame using av_frame_unref()
4974  * when the frame is no longer needed. The caller may safely write
4975  * to the frame if av_frame_is_writable() returns 1.
4976  * When AVCodecContext.refcounted_frames is set to 0, the returned
4977  * reference belongs to the decoder and is valid only until the
4978  * next call to this function or until closing or flushing the
4979  * decoder. The caller may not write to it.
4980  *
4981  * @param[in] avpkt The input AVPacket containing the input buffer.
4982  * You can create such packet with av_init_packet() and by then setting
4983  * data and size, some decoders might in addition need other fields like
4984  * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4985  * fields possible.
4986  * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4987  * @return On error a negative value is returned, otherwise the number of bytes
4988  * used or zero if no frame could be decompressed.
4989  *
4990  * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4991  */
4993 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4994  int *got_picture_ptr,
4995  const AVPacket *avpkt);
4996 
4997 /**
4998  * Decode a subtitle message.
4999  * Return a negative value on error, otherwise return the number of bytes used.
5000  * If no subtitle could be decompressed, got_sub_ptr is zero.
5001  * Otherwise, the subtitle is stored in *sub.
5002  * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
5003  * simplicity, because the performance difference is expect to be negligible
5004  * and reusing a get_buffer written for video codecs would probably perform badly
5005  * due to a potentially very different allocation pattern.
5006  *
5007  * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
5008  * and output. This means that for some packets they will not immediately
5009  * produce decoded output and need to be flushed at the end of decoding to get
5010  * all the decoded data. Flushing is done by calling this function with packets
5011  * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
5012  * returning subtitles. It is safe to flush even those decoders that are not
5013  * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
5014  *
5015  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
5016  * before packets may be fed to the decoder.
5017  *
5018  * @param avctx the codec context
5019  * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
5020  * must be freed with avsubtitle_free if *got_sub_ptr is set.
5021  * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
5022  * @param[in] avpkt The input AVPacket containing the input buffer.
5023  */
5025  int *got_sub_ptr,
5026  AVPacket *avpkt);
5027 
5028 /**
5029  * Supply raw packet data as input to a decoder.
5030  *
5031  * Internally, this call will copy relevant AVCodecContext fields, which can
5032  * influence decoding per-packet, and apply them when the packet is actually
5033  * decoded. (For example AVCodecContext.skip_frame, which might direct the
5034  * decoder to drop the frame contained by the packet sent with this function.)
5035  *
5036  * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
5037  * larger than the actual read bytes because some optimized bitstream
5038  * readers read 32 or 64 bits at once and could read over the end.
5039  *
5040  * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
5041  * on the same AVCodecContext. It will return unexpected results now
5042  * or in future libavcodec versions.
5043  *
5044  * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
5045  * before packets may be fed to the decoder.
5046  *
5047  * @param avctx codec context
5048  * @param[in] avpkt The input AVPacket. Usually, this will be a single video
5049  * frame, or several complete audio frames.
5050  * Ownership of the packet remains with the caller, and the
5051  * decoder will not write to the packet. The decoder may create
5052  * a reference to the packet data (or copy it if the packet is
5053  * not reference-counted).
5054  * Unlike with older APIs, the packet is always fully consumed,
5055  * and if it contains multiple frames (e.g. some audio codecs),
5056  * will require you to call avcodec_receive_frame() multiple
5057  * times afterwards before you can send a new packet.
5058  * It can be NULL (or an AVPacket with data set to NULL and
5059  * size set to 0); in this case, it is considered a flush
5060  * packet, which signals the end of the stream. Sending the
5061  * first flush packet will return success. Subsequent ones are
5062  * unnecessary and will return AVERROR_EOF. If the decoder
5063  * still has frames buffered, it will return them after sending
5064  * a flush packet.
5065  *
5066  * @return 0 on success, otherwise negative error code:
5067  * AVERROR(EAGAIN): input is not accepted in the current state - user
5068  * must read output with avcodec_receive_frame() (once
5069  * all output is read, the packet should be resent, and
5070  * the call will not fail with EAGAIN).
5071  * AVERROR_EOF: the decoder has been flushed, and no new packets can
5072  * be sent to it (also returned if more than 1 flush
5073  * packet is sent)
5074  * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
5075  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5076  * other errors: legitimate decoding errors
5077  */
5078 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
5079 
5080 /**
5081  * Return decoded output data from a decoder.
5082  *
5083  * @param avctx codec context
5084  * @param frame This will be set to a reference-counted video or audio
5085  * frame (depending on the decoder type) allocated by the
5086  * decoder. Note that the function will always call
5087  * av_frame_unref(frame) before doing anything else.
5088  *
5089  * @return
5090  * 0: success, a frame was returned
5091  * AVERROR(EAGAIN): output is not available in this state - user must try
5092  * to send new input
5093  * AVERROR_EOF: the decoder has been fully flushed, and there will be
5094  * no more output frames
5095  * AVERROR(EINVAL): codec not opened, or it is an encoder
5096  * other negative values: legitimate decoding errors
5097  */
5099 
5100 /**
5101  * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
5102  * to retrieve buffered output packets.
5103  *
5104  * @param avctx codec context
5105  * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
5106  * Ownership of the frame remains with the caller, and the
5107  * encoder will not write to the frame. The encoder may create
5108  * a reference to the frame data (or copy it if the frame is
5109  * not reference-counted).
5110  * It can be NULL, in which case it is considered a flush
5111  * packet. This signals the end of the stream. If the encoder
5112  * still has packets buffered, it will return them after this
5113  * call. Once flushing mode has been entered, additional flush
5114  * packets are ignored, and sending frames will return
5115  * AVERROR_EOF.
5116  *
5117  * For audio:
5118  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5119  * can have any number of samples.
5120  * If it is not set, frame->nb_samples must be equal to
5121  * avctx->frame_size for all frames except the last.
5122  * The final frame may be smaller than avctx->frame_size.
5123  * @return 0 on success, otherwise negative error code:
5124  * AVERROR(EAGAIN): input is not accepted in the current state - user
5125  * must read output with avcodec_receive_packet() (once
5126  * all output is read, the packet should be resent, and
5127  * the call will not fail with EAGAIN).
5128  * AVERROR_EOF: the encoder has been flushed, and no new frames can
5129  * be sent to it
5130  * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5131  * decoder, or requires flush
5132  * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5133  * other errors: legitimate decoding errors
5134  */
5135 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5136 
5137 /**
5138  * Read encoded data from the encoder.
5139  *
5140  * @param avctx codec context
5141  * @param avpkt This will be set to a reference-counted packet allocated by the
5142  * encoder. Note that the function will always call
5143  * av_frame_unref(frame) before doing anything else.
5144  * @return 0 on success, otherwise negative error code:
5145  * AVERROR(EAGAIN): output is not available in the current state - user
5146  * must try to send input
5147  * AVERROR_EOF: the encoder has been fully flushed, and there will be
5148  * no more output packets
5149  * AVERROR(EINVAL): codec not opened, or it is an encoder
5150  * other errors: legitimate decoding errors
5151  */
5152 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5153 
5154 
5155 /**
5156  * @defgroup lavc_parsing Frame parsing
5157  * @{
5158  */
5159 
5162  AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5163  AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5164  AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5165 };
5166 
5167 typedef struct AVCodecParserContext {
5168  void *priv_data;
5170  int64_t frame_offset; /* offset of the current frame */
5171  int64_t cur_offset; /* current offset
5172  (incremented by each av_parser_parse()) */
5173  int64_t next_frame_offset; /* offset of the next frame */
5174  /* video info */
5175  int pict_type; /* XXX: Put it back in AVCodecContext. */
5176  /**
5177  * This field is used for proper frame duration computation in lavf.
5178  * It signals, how much longer the frame duration of the current frame
5179  * is compared to normal frame duration.
5180  *
5181  * frame_duration = (1 + repeat_pict) * time_base
5182  *
5183  * It is used by codecs like H.264 to display telecined material.
5184  */
5185  int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5186  int64_t pts; /* pts of the current frame */
5187  int64_t dts; /* dts of the current frame */
5188 
5189  /* private data */
5190  int64_t last_pts;
5191  int64_t last_dts;
5193 
5194 #define AV_PARSER_PTS_NB 4
5199 
5200  int flags;
5201 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5202 #define PARSER_FLAG_ONCE 0x0002
5203 /// Set if the parser has a valid file offset
5204 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5205 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5206 
5207  int64_t offset; ///< byte offset from starting packet start
5209 
5210  /**
5211  * Set by parser to 1 for key frames and 0 for non-key frames.
5212  * It is initialized to -1, so if the parser doesn't set this flag,
5213  * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5214  * will be used.
5215  */
5217 
5218 #if FF_API_CONVERGENCE_DURATION
5219  /**
5220  * @deprecated unused
5221  */
5224 #endif
5225 
5226  // Timestamp generation support:
5227  /**
5228  * Synchronization point for start of timestamp generation.
5229  *
5230  * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5231  * (default).
5232  *
5233  * For example, this corresponds to presence of H.264 buffering period
5234  * SEI message.
5235  */
5237 
5238  /**
5239  * Offset of the current timestamp against last timestamp sync point in
5240  * units of AVCodecContext.time_base.
5241  *
5242  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5243  * contain a valid timestamp offset.
5244  *
5245  * Note that the timestamp of sync point has usually a nonzero
5246  * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5247  * the next frame after timestamp sync point will be usually 1.
5248  *
5249  * For example, this corresponds to H.264 cpb_removal_delay.
5250  */
5252 
5253  /**
5254  * Presentation delay of current frame in units of AVCodecContext.time_base.
5255  *
5256  * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5257  * contain valid non-negative timestamp delta (presentation time of a frame
5258  * must not lie in the past).
5259  *
5260  * This delay represents the difference between decoding and presentation
5261  * time of the frame.
5262  *
5263  * For example, this corresponds to H.264 dpb_output_delay.
5264  */
5266 
5267  /**
5268  * Position of the packet in file.
5269  *
5270  * Analogous to cur_frame_pts/dts
5271  */
5273 
5274  /**
5275  * Byte position of currently parsed frame in stream.
5276  */
5277  int64_t pos;
5278 
5279  /**
5280  * Previous frame byte position.
5281  */
5282  int64_t last_pos;
5283 
5284  /**
5285  * Duration of the current frame.
5286  * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5287  * For all other types, this is in units of AVCodecContext.time_base.
5288  */
5290 
5292 
5293  /**
5294  * Indicate whether a picture is coded as a frame, top field or bottom field.
5295  *
5296  * For example, H.264 field_pic_flag equal to 0 corresponds to
5297  * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5298  * equal to 1 and bottom_field_flag equal to 0 corresponds to
5299  * AV_PICTURE_STRUCTURE_TOP_FIELD.
5300  */
5302 
5303  /**
5304  * Picture number incremented in presentation or output order.
5305  * This field may be reinitialized at the first picture of a new sequence.
5306  *
5307  * For example, this corresponds to H.264 PicOrderCnt.
5308  */
5310 
5311  /**
5312  * Dimensions of the decoded video intended for presentation.
5313  */
5314  int width;
5315  int height;
5316 
5317  /**
5318  * Dimensions of the coded video.
5319  */
5322 
5323  /**
5324  * The format of the coded data, corresponds to enum AVPixelFormat for video
5325  * and for enum AVSampleFormat for audio.
5326  *
5327  * Note that a decoder can have considerable freedom in how exactly it
5328  * decodes the data, so the format reported here might be different from the
5329  * one returned by a decoder.
5330  */
5331  int format;
5333 
5334 typedef struct AVCodecParser {
5335  int codec_ids[5]; /* several codec IDs are permitted */
5338  /* This callback never returns an error, a negative value means that
5339  * the frame start was in a previous packet. */
5341  AVCodecContext *avctx,
5342  const uint8_t **poutbuf, int *poutbuf_size,
5343  const uint8_t *buf, int buf_size);
5345  int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5347 } AVCodecParser;
5348 
5350 
5353 
5354 /**
5355  * Parse a packet.
5356  *
5357  * @param s parser context.
5358  * @param avctx codec context.
5359  * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5360  * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5361  * @param buf input buffer.
5362  * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5363  size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5364  To signal EOF, this should be 0 (so that the last frame
5365  can be output).
5366  * @param pts input presentation timestamp.
5367  * @param dts input decoding timestamp.
5368  * @param pos input byte position in stream.
5369  * @return the number of bytes of the input bitstream used.
5370  *
5371  * Example:
5372  * @code
5373  * while(in_len){
5374  * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5375  * in_data, in_len,
5376  * pts, dts, pos);
5377  * in_data += len;
5378  * in_len -= len;
5379  *
5380  * if(size)
5381  * decode_frame(data, size);
5382  * }
5383  * @endcode
5384  */
5386  AVCodecContext *avctx,
5387  uint8_t **poutbuf, int *poutbuf_size,
5388  const uint8_t *buf, int buf_size,
5389  int64_t pts, int64_t dts,
5390  int64_t pos);
5391 
5392 /**
5393  * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5394  * @deprecated use AVBitStreamFilter
5395  */
5397  AVCodecContext *avctx,
5398  uint8_t **poutbuf, int *poutbuf_size,
5399  const uint8_t *buf, int buf_size, int keyframe);
5401 
5402 /**
5403  * @}
5404  * @}
5405  */
5406 
5407 /**
5408  * @addtogroup lavc_encoding
5409  * @{
5410  */
5411 
5412 /**
5413  * Find a registered encoder with a matching codec ID.
5414  *
5415  * @param id AVCodecID of the requested encoder
5416  * @return An encoder if one was found, NULL otherwise.
5417  */
5419 
5420 /**
5421  * Find a registered encoder with the specified name.
5422  *
5423  * @param name name of the requested encoder
5424  * @return An encoder if one was found, NULL otherwise.
5425  */
5427 
5428 /**
5429  * Encode a frame of audio.
5430  *
5431  * Takes input samples from frame and writes the next output packet, if
5432  * available, to avpkt. The output packet does not necessarily contain data for
5433  * the most recent frame, as encoders can delay, split, and combine input frames
5434  * internally as needed.
5435  *
5436  * @param avctx codec context
5437  * @param avpkt output AVPacket.
5438  * The user can supply an output buffer by setting
5439  * avpkt->data and avpkt->size prior to calling the
5440  * function, but if the size of the user-provided data is not
5441  * large enough, encoding will fail. If avpkt->data and
5442  * avpkt->size are set, avpkt->destruct must also be set. All
5443  * other AVPacket fields will be reset by the encoder using
5444  * av_init_packet(). If avpkt->data is NULL, the encoder will
5445  * allocate it. The encoder will set avpkt->size to the size
5446  * of the output packet.
5447  *
5448  * If this function fails or produces no output, avpkt will be
5449  * freed using av_packet_unref().
5450  * @param[in] frame AVFrame containing the raw audio data to be encoded.
5451  * May be NULL when flushing an encoder that has the
5452  * AV_CODEC_CAP_DELAY capability set.
5453  * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5454  * can have any number of samples.
5455  * If it is not set, frame->nb_samples must be equal to
5456  * avctx->frame_size for all frames except the last.
5457  * The final frame may be smaller than avctx->frame_size.
5458  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5459  * output packet is non-empty, and to 0 if it is
5460  * empty. If the function returns an error, the
5461  * packet can be assumed to be invalid, and the
5462  * value of got_packet_ptr is undefined and should
5463  * not be used.
5464  * @return 0 on success, negative error code on failure
5465  *
5466  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5467  */
5469 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5470  const AVFrame *frame, int *got_packet_ptr);
5471 
5472 /**
5473  * Encode a frame of video.
5474  *
5475  * Takes input raw video data from frame and writes the next output packet, if
5476  * available, to avpkt. The output packet does not necessarily contain data for
5477  * the most recent frame, as encoders can delay and reorder input frames
5478  * internally as needed.
5479  *
5480  * @param avctx codec context
5481  * @param avpkt output AVPacket.
5482  * The user can supply an output buffer by setting
5483  * avpkt->data and avpkt->size prior to calling the
5484  * function, but if the size of the user-provided data is not
5485  * large enough, encoding will fail. All other AVPacket fields
5486  * will be reset by the encoder using av_init_packet(). If
5487  * avpkt->data is NULL, the encoder will allocate it.
5488  * The encoder will set avpkt->size to the size of the
5489  * output packet. The returned data (if any) belongs to the
5490  * caller, he is responsible for freeing it.
5491  *
5492  * If this function fails or produces no output, avpkt will be
5493  * freed using av_packet_unref().
5494  * @param[in] frame AVFrame containing the raw video data to be encoded.
5495  * May be NULL when flushing an encoder that has the
5496  * AV_CODEC_CAP_DELAY capability set.
5497  * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5498  * output packet is non-empty, and to 0 if it is
5499  * empty. If the function returns an error, the
5500  * packet can be assumed to be invalid, and the
5501  * value of got_packet_ptr is undefined and should
5502  * not be used.
5503  * @return 0 on success, negative error code on failure
5504  *
5505  * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5506  */
5508 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5509  const AVFrame *frame, int *got_packet_ptr);
5510 
5511 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5512  const AVSubtitle *sub);
5513 
5514 
5515 /**
5516  * @}
5517  */
5518 
5519 #if FF_API_AVCODEC_RESAMPLE
5520 /**
5521  * @defgroup lavc_resample Audio resampling
5522  * @ingroup libavc
5523  * @deprecated use libswresample instead
5524  *
5525  * @{
5526  */
5527 struct ReSampleContext;
5528 struct AVResampleContext;
5529 
5530 typedef struct ReSampleContext ReSampleContext;
5531 
5532 /**
5533  * Initialize audio resampling context.
5534  *
5535  * @param output_channels number of output channels
5536  * @param input_channels number of input channels
5537  * @param output_rate output sample rate
5538  * @param input_rate input sample rate
5539  * @param sample_fmt_out requested output sample format
5540  * @param sample_fmt_in input sample format
5541  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
5542  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5543  * @param linear if 1 then the used FIR filter will be linearly interpolated
5544  between the 2 closest, if 0 the closest will be used
5545  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5546  * @return allocated ReSampleContext, NULL if error occurred
5547  */
5550  int output_rate, int input_rate,
5551  enum AVSampleFormat sample_fmt_out,
5552  enum AVSampleFormat sample_fmt_in,
5553  int filter_length, int log2_phase_count,
5554  int linear, double cutoff);
5555 
5557 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
5558 
5559 /**
5560  * Free resample context.
5561  *
5562  * @param s a non-NULL pointer to a resample context previously
5563  * created with av_audio_resample_init()
5564  */
5567 
5568 
5569 /**
5570  * Initialize an audio resampler.
5571  * Note, if either rate is not an integer then simply scale both rates up so they are.
5572  * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
5573  * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5574  * @param linear If 1 then the used FIR filter will be linearly interpolated
5575  between the 2 closest, if 0 the closest will be used
5576  * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5577  */
5579 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
5580 
5581 /**
5582  * Resample an array of samples using a previously configured context.
5583  * @param src an array of unconsumed samples
5584  * @param consumed the number of samples of src which have been consumed are returned here
5585  * @param src_size the number of unconsumed samples available
5586  * @param dst_size the amount of space in samples available in dst
5587  * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
5588  * @return the number of samples written in dst or -1 if an error occurred
5589  */
5591 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
5592 
5593 
5594 /**
5595  * Compensate samplerate/timestamp drift. The compensation is done by changing
5596  * the resampler parameters, so no audible clicks or similar distortions occur
5597  * @param compensation_distance distance in output samples over which the compensation should be performed
5598  * @param sample_delta number of output samples which should be output less
5599  *
5600  * example: av_resample_compensate(c, 10, 500)
5601  * here instead of 510 samples only 500 samples would be output
5602  *
5603  * note, due to rounding the actual compensation might be slightly different,
5604  * especially if the compensation_distance is large and the in_rate used during init is small
5605  */
5607 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
5609 void av_resample_close(struct AVResampleContext *c);
5610 
5611 /**
5612  * @}
5613  */
5614 #endif
5615 
5616 #if FF_API_AVPICTURE
5617 /**
5618  * @addtogroup lavc_picture
5619  * @{
5620  */
5621 
5622 /**
5623  * @deprecated unused
5624  */
5626 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5627 
5628 /**
5629  * @deprecated unused
5630  */
5632 void avpicture_free(AVPicture *picture);
5633 
5634 /**
5635  * @deprecated use av_image_fill_arrays() instead.
5636  */
5638 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5639  enum AVPixelFormat pix_fmt, int width, int height);
5640 
5641 /**
5642  * @deprecated use av_image_copy_to_buffer() instead.
5643  */
5646  int width, int height,
5647  unsigned char *dest, int dest_size);
5648 
5649 /**
5650  * @deprecated use av_image_get_buffer_size() instead.
5651  */
5654 
5655 /**
5656  * @deprecated av_image_copy() instead.
5657  */
5659 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5660  enum AVPixelFormat pix_fmt, int width, int height);
5661 
5662 /**
5663  * @deprecated unused
5664  */
5666 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5667  enum AVPixelFormat pix_fmt, int top_band, int left_band);
5668 
5669 /**
5670  * @deprecated unused
5671  */
5673 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5674  int padtop, int padbottom, int padleft, int padright, int *color);
5675 
5676 /**
5677  * @}
5678  */
5679 #endif
5680 
5681 /**
5682  * @defgroup lavc_misc Utility functions
5683  * @ingroup libavc
5684  *
5685  * Miscellaneous utility functions related to both encoding and decoding
5686  * (or neither).
5687  * @{
5688  */
5689 
5690 /**
5691  * @defgroup lavc_misc_pixfmt Pixel formats
5692  *
5693  * Functions for working with pixel formats.
5694  * @{
5695  */
5696 
5697 #if FF_API_GETCHROMA
5698 /**
5699  * @deprecated Use av_pix_fmt_get_chroma_sub_sample
5700  */
5701 
5703 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5704 #endif
5705 
5706 /**
5707  * Return a value representing the fourCC code associated to the
5708  * pixel format pix_fmt, or 0 if no associated fourCC code can be
5709  * found.
5710  */
5712 
5713 /**
5714  * @deprecated see av_get_pix_fmt_loss()
5715  */
5716 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5717  int has_alpha);
5718 
5719 /**
5720  * Find the best pixel format to convert to given a certain source pixel
5721  * format. When converting from one pixel format to another, information loss
5722  * may occur. For example, when converting from RGB24 to GRAY, the color
5723  * information will be lost. Similarly, other losses occur when converting from
5724  * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5725  * the given pixel formats should be used to suffer the least amount of loss.
5726  * The pixel formats from which it chooses one, are determined by the
5727  * pix_fmt_list parameter.
5728  *
5729  *
5730  * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5731  * @param[in] src_pix_fmt source pixel format
5732  * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5733  * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5734  * @return The best pixel format to convert to or -1 if none was found.
5735  */
5736 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5737  enum AVPixelFormat src_pix_fmt,
5738  int has_alpha, int *loss_ptr);
5739 
5740 /**
5741  * @deprecated see av_find_best_pix_fmt_of_2()
5742  */
5743 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5744  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5745 
5747 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5748  enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5749 
5751 
5752 /**
5753  * @}
5754  */
5755 
5756 #if FF_API_SET_DIMENSIONS
5757 /**
5758  * @deprecated this function is not supposed to be used from outside of lavc
5759  */
5762 #endif
5763 
5764 #if FF_API_TAG_STRING
5765 /**
5766  * Put a string representing the codec tag codec_tag in buf.
5767  *
5768  * @param buf buffer to place codec tag in
5769  * @param buf_size size in bytes of buf
5770  * @param codec_tag codec tag to assign
5771  * @return the length of the string that would have been generated if
5772  * enough space had been available, excluding the trailing null
5773  *
5774  * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5775  */
5777 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5778 #endif
5779 
5780 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5781 
5782 /**
5783  * Return a name for the specified profile, if available.
5784  *
5785  * @param codec the codec that is searched for the given profile
5786  * @param profile the profile value for which a name is requested
5787  * @return A name for the profile if found, NULL otherwise.
5788  */
5789 const char *av_get_profile_name(const AVCodec *codec, int profile);
5790 
5791 /**
5792  * Return a name for the specified profile, if available.
5793  *
5794  * @param codec_id the ID of the codec to which the requested profile belongs
5795  * @param profile the profile value for which a name is requested
5796  * @return A name for the profile if found, NULL otherwise.
5797  *
5798  * @note unlike av_get_profile_name(), which searches a list of profiles
5799  * supported by a specific decoder or encoder implementation, this
5800  * function searches the list of profiles from the AVCodecDescriptor
5801  */
5802 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5803 
5804 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5805 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5806 //FIXME func typedef
5807 
5808 /**
5809  * Fill AVFrame audio data and linesize pointers.
5810  *
5811  * The buffer buf must be a preallocated buffer with a size big enough
5812  * to contain the specified samples amount. The filled AVFrame data
5813  * pointers will point to this buffer.
5814  *
5815  * AVFrame extended_data channel pointers are allocated if necessary for
5816  * planar audio.
5817  *
5818  * @param frame the AVFrame
5819  * frame->nb_samples must be set prior to calling the
5820  * function. This function fills in frame->data,
5821  * frame->extended_data, frame->linesize[0].
5822  * @param nb_channels channel count
5823  * @param sample_fmt sample format
5824  * @param buf buffer to use for frame data
5825  * @param buf_size size of buffer
5826  * @param align plane size sample alignment (0 = default)
5827  * @return >=0 on success, negative error code on failure
5828  * @todo return the size in bytes required to store the samples in
5829  * case of success, at the next libavutil bump
5830  */
5832  enum AVSampleFormat sample_fmt, const uint8_t *buf,
5833  int buf_size, int align);
5834 
5835 /**
5836  * Reset the internal decoder state / flush internal buffers. Should be called
5837  * e.g. when seeking or when switching to a different stream.
5838  *
5839  * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5840  * this invalidates the frames previously returned from the decoder. When
5841  * refcounted frames are used, the decoder just releases any references it might
5842  * keep internally, but the caller's reference remains valid.
5843  */
5845 
5846 /**
5847  * Return codec bits per sample.
5848  *
5849  * @param[in] codec_id the codec
5850  * @return Number of bits per sample or zero if unknown for the given codec.
5851  */
5853 
5854 /**
5855  * Return the PCM codec associated with a sample format.
5856  * @param be endianness, 0 for little, 1 for big,
5857  * -1 (or anything else) for native
5858  * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5859  */
5860 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5861 
5862 /**
5863  * Return codec bits per sample.
5864  * Only return non-zero if the bits per sample is exactly correct, not an
5865  * approximation.
5866  *
5867  * @param[in] codec_id the codec
5868  * @return Number of bits per sample or zero if unknown for the given codec.
5869  */
5871 
5872 /**
5873  * Return audio frame duration.
5874  *
5875  * @param avctx codec context
5876  * @param frame_bytes size of the frame, or 0 if unknown
5877  * @return frame duration, in samples, if known. 0 if not able to
5878  * determine.
5879  */
5880 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5881 
5882 /**
5883  * This function is the same as av_get_audio_frame_duration(), except it works
5884  * with AVCodecParameters instead of an AVCodecContext.
5885  */
5886 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5887 
5888 #if FF_API_OLD_BSF
5890  void *priv_data;
5891  const struct AVBitStreamFilter *filter;
5894  /**
5895  * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5896  * Not for access by library users.
5897  */
5898  char *args;
5900 #endif
5901 
5902 typedef struct AVBSFInternal AVBSFInternal;
5903 
5904 /**
5905  * The bitstream filter state.
5906  *
5907  * This struct must be allocated with av_bsf_alloc() and freed with
5908  * av_bsf_free().
5909  *
5910  * The fields in the struct will only be changed (by the caller or by the
5911  * filter) as described in their documentation, and are to be considered
5912  * immutable otherwise.
5913  */
5914 typedef struct AVBSFContext {
5915  /**
5916  * A class for logging and AVOptions
5917  */
5919 
5920  /**
5921  * The bitstream filter this context is an instance of.
5922  */
5923  const struct AVBitStreamFilter *filter;
5924 
5925  /**
5926  * Opaque libavcodec internal data. Must not be touched by the caller in any
5927  * way.
5928  */
5929  AVBSFInternal *internal;
5930 
5931  /**
5932  * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5933  * this is an AVOptions-enabled struct.
5934  */
5935  void *priv_data;
5936 
5937  /**
5938  * Parameters of the input stream. This field is allocated in
5939  * av_bsf_alloc(), it needs to be filled by the caller before
5940  * av_bsf_init().
5941  */
5943 
5944  /**
5945  * Parameters of the output stream. This field is allocated in
5946  * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5947  */
5949 
5950  /**
5951  * The timebase used for the timestamps of the input packets. Set by the
5952  * caller before av_bsf_init().
5953  */
5955 
5956  /**
5957  * The timebase used for the timestamps of the output packets. Set by the
5958  * filter in av_bsf_init().
5959  */
5961 } AVBSFContext;
5962 
5963 typedef struct AVBitStreamFilter {
5964  const char *name;
5965 
5966  /**
5967  * A list of codec ids supported by the filter, terminated by
5968  * AV_CODEC_ID_NONE.
5969  * May be NULL, in that case the bitstream filter works with any codec id.
5970  */
5971  const enum AVCodecID *codec_ids;
5972 
5973  /**
5974  * A class for the private data, used to declare bitstream filter private
5975  * AVOptions. This field is NULL for bitstream filters that do not declare
5976  * any options.
5977  *
5978  * If this field is non-NULL, the first member of the filter private data
5979  * must be a pointer to AVClass, which will be set by libavcodec generic
5980  * code to this class.
5981  */
5983 
5984  /*****************************************************************
5985  * No fields below this line are part of the public API. They
5986  * may not be used outside of libavcodec and can be changed and
5987  * removed at will.
5988  * New public fields should be added right above.
5989  *****************************************************************
5990  */
5991 
5997 
5998 #if FF_API_OLD_BSF
5999 /**
6000  * Register a bitstream filter.
6001  *
6002  * The filter will be accessible to the application code through
6003  * av_bitstream_filter_next() or can be directly initialized with
6004  * av_bitstream_filter_init().
6005  *
6006  * @see avcodec_register_all()
6007  */
6010 
6011 /**
6012  * Create and initialize a bitstream filter context given a bitstream
6013  * filter name.
6014  *
6015  * The returned context must be freed with av_bitstream_filter_close().
6016  *
6017  * @param name the name of the bitstream filter
6018  * @return a bitstream filter context if a matching filter was found
6019  * and successfully initialized, NULL otherwise
6020  */
6023 
6024 /**
6025  * Filter bitstream.
6026  *
6027  * This function filters the buffer buf with size buf_size, and places the
6028  * filtered buffer in the buffer pointed to by poutbuf.
6029  *
6030  * The output buffer must be freed by the caller.
6031  *
6032  * @param bsfc bitstream filter context created by av_bitstream_filter_init()
6033  * @param avctx AVCodecContext accessed by the filter, may be NULL.
6034  * If specified, this must point to the encoder context of the
6035  * output stream the packet is sent to.
6036  * @param args arguments which specify the filter configuration, may be NULL
6037  * @param poutbuf pointer which is updated to point to the filtered buffer
6038  * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
6039  * @param buf buffer containing the data to filter
6040  * @param buf_size size in bytes of buf
6041  * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
6042  * @return >= 0 in case of success, or a negative error code in case of failure
6043  *
6044  * If the return value is positive, an output buffer is allocated and
6045  * is available in *poutbuf, and is distinct from the input buffer.
6046  *
6047  * If the return value is 0, the output buffer is not allocated and
6048  * should be considered identical to the input buffer, or in case
6049  * *poutbuf was set it points to the input buffer (not necessarily to
6050  * its starting address). A special case is if *poutbuf was set to NULL and
6051  * *poutbuf_size was set to 0, which indicates the packet should be dropped.
6052  */
6055  AVCodecContext *avctx, const char *args,
6056  uint8_t **poutbuf, int *poutbuf_size,
6057  const uint8_t *buf, int buf_size, int keyframe);
6058 
6059 /**
6060  * Release bitstream filter context.
6061  *
6062  * @param bsf the bitstream filter context created with
6063  * av_bitstream_filter_init(), can be NULL
6064  */
6067 
6068 /**
6069  * If f is NULL, return the first registered bitstream filter,
6070  * if f is non-NULL, return the next registered bitstream filter
6071  * after f, or NULL if f is the last one.
6072  *
6073  * This function can be used to iterate over all registered bitstream
6074  * filters.
6075  */
6078 #endif
6079 
6080 /**
6081  * @return a bitstream filter with the specified name or NULL if no such
6082  * bitstream filter exists.
6083  */
6084 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
6085 
6086 /**
6087  * Iterate over all registered bitstream filters.
6088  *
6089  * @param opaque a pointer where libavcodec will store the iteration state. Must
6090  * point to NULL to start the iteration.
6091  *
6092  * @return the next registered bitstream filter or NULL when the iteration is
6093  * finished
6094  */
6095 const AVBitStreamFilter *av_bsf_next(void **opaque);
6096 
6097 /**
6098  * Allocate a context for a given bitstream filter. The caller must fill in the
6099  * context parameters as described in the documentation and then call
6100  * av_bsf_init() before sending any data to the filter.
6101  *
6102  * @param filter the filter for which to allocate an instance.
6103  * @param ctx a pointer into which the pointer to the newly-allocated context
6104  * will be written. It must be freed with av_bsf_free() after the
6105  * filtering is done.
6106  *
6107  * @return 0 on success, a negative AVERROR code on failure
6108  */
6110 
6111 /**
6112  * Prepare the filter for use, after all the parameters and options have been
6113  * set.
6114  */
6116 
6117 /**
6118  * Submit a packet for filtering.
6119  *
6120  * After sending each packet, the filter must be completely drained by calling
6121  * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
6122  * AVERROR_EOF.
6123  *
6124  * @param pkt the packet to filter. The bitstream filter will take ownership of
6125  * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
6126  * This parameter may be NULL, which signals the end of the stream (i.e. no more
6127  * packets will be sent). That will cause the filter to output any packets it
6128  * may have buffered internally.
6129  *
6130  * @return 0 on success, a negative AVERROR on error.
6131  */
6133 
6134 /**
6135  * Retrieve a filtered packet.
6136  *
6137  * @param[out] pkt this struct will be filled with the contents of the filtered
6138  * packet. It is owned by the caller and must be freed using
6139  * av_packet_unref() when it is no longer needed.
6140  * This parameter should be "clean" (i.e. freshly allocated
6141  * with av_packet_alloc() or unreffed with av_packet_unref())
6142  * when this function is called. If this function returns
6143  * successfully, the contents of pkt will be completely
6144  * overwritten by the returned data. On failure, pkt is not
6145  * touched.
6146  *
6147  * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
6148  * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
6149  * will be no further output from the filter. Another negative AVERROR value if
6150  * an error occurs.
6151  *
6152  * @note one input packet may result in several output packets, so after sending
6153  * a packet with av_bsf_send_packet(), this function needs to be called
6154  * repeatedly until it stops returning 0. It is also possible for a filter to
6155  * output fewer packets than were sent to it, so this function may return
6156  * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
6157  */
6159 
6160 /**
6161  * Free a bitstream filter context and everything associated with it; write NULL
6162  * into the supplied pointer.
6163  */
6164 void av_bsf_free(AVBSFContext **ctx);
6165 
6166 /**
6167  * Get the AVClass for AVBSFContext. It can be used in combination with
6168  * AV_OPT_SEARCH_FAKE_OBJ for examining options.
6169  *
6170  * @see av_opt_find().
6171  */
6172 const AVClass *av_bsf_get_class(void);
6173 
6174 /**
6175  * Structure for chain/list of bitstream filters.
6176  * Empty list can be allocated by av_bsf_list_alloc().
6177  */
6178 typedef struct AVBSFList AVBSFList;
6179 
6180 /**
6181  * Allocate empty list of bitstream filters.
6182  * The list must be later freed by av_bsf_list_free()
6183  * or finalized by av_bsf_list_finalize().
6184  *
6185  * @return Pointer to @ref AVBSFList on success, NULL in case of failure
6186  */
6188 
6189 /**
6190  * Free list of bitstream filters.
6191  *
6192  * @param lst Pointer to pointer returned by av_bsf_list_alloc()
6193  */
6194 void av_bsf_list_free(AVBSFList **lst);
6195 
6196 /**
6197  * Append bitstream filter to the list of bitstream filters.
6198  *
6199  * @param lst List to append to
6200  * @param bsf Filter context to be appended
6201  *
6202  * @return >=0 on success, negative AVERROR in case of failure
6203  */
6204 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
6205 
6206 /**
6207  * Construct new bitstream filter context given it's name and options
6208  * and append it to the list of bitstream filters.
6209  *
6210  * @param lst List to append to
6211  * @param bsf_name Name of the bitstream filter
6212  * @param options Options for the bitstream filter, can be set to NULL
6213  *
6214  * @return >=0 on success, negative AVERROR in case of failure
6215  */
6216 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
6217 /**
6218  * Finalize list of bitstream filters.
6219  *
6220  * This function will transform @ref AVBSFList to single @ref AVBSFContext,
6221  * so the whole chain of bitstream filters can be treated as single filter
6222  * freshly allocated by av_bsf_alloc().
6223  * If the call is successful, @ref AVBSFList structure is freed and lst
6224  * will be set to NULL. In case of failure, caller is responsible for
6225  * freeing the structure by av_bsf_list_free()
6226  *
6227  * @param lst Filter list structure to be transformed
6228  * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6229  * representing the chain of bitstream filters
6230  *
6231  * @return >=0 on success, negative AVERROR in case of failure
6232  */
6233 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
6234 
6235 /**
6236  * Parse string describing list of bitstream filters and create single
6237  * @ref AVBSFContext describing the whole chain of bitstream filters.
6238  * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
6239  * allocated by av_bsf_alloc().
6240  *
6241  * @param str String describing chain of bitstream filters in format
6242  * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
6243  * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6244  * representing the chain of bitstream filters
6245  *
6246  * @return >=0 on success, negative AVERROR in case of failure
6247  */
6248 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
6249 
6250 /**
6251  * Get null/pass-through bitstream filter.
6252  *
6253  * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
6254  *
6255  * @return
6256  */
6258 
6259 /* memory */
6260 
6261 /**
6262  * Same behaviour av_fast_malloc but the buffer has additional
6263  * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
6264  *
6265  * In addition the whole buffer will initially and after resizes
6266  * be 0-initialized so that no uninitialized data will ever appear.
6267  */
6268 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6269 
6270 /**
6271  * Same behaviour av_fast_padded_malloc except that buffer will always
6272  * be 0-initialized after call.
6273  */
6274 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6275 
6276 /**
6277  * Encode extradata length to a buffer. Used by xiph codecs.
6278  *
6279  * @param s buffer to write to; must be at least (v/255+1) bytes long
6280  * @param v size of extradata in bytes
6281  * @return number of bytes written to the buffer.
6282  */
6283 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6284 
6285 #if FF_API_MISSING_SAMPLE
6286 /**
6287  * Log a generic warning message about a missing feature. This function is
6288  * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
6289  * only, and would normally not be used by applications.
6290  * @param[in] avc a pointer to an arbitrary struct of which the first field is
6291  * a pointer to an AVClass struct
6292  * @param[in] feature string containing the name of the missing feature
6293  * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
6294  * If want_sample is non-zero, additional verbiage will be added to the log
6295  * message which tells the user how to report samples to the development
6296  * mailing list.
6297  * @deprecated Use avpriv_report_missing_feature() instead.
6298  */
6300 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
6301 
6302 /**
6303  * Log a generic warning message asking for a sample. This function is
6304  * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
6305  * only, and would normally not be used by applications.
6306  * @param[in] avc a pointer to an arbitrary struct of which the first field is
6307  * a pointer to an AVClass struct
6308  * @param[in] msg string containing an optional message, or NULL if no message
6309  * @deprecated Use avpriv_request_sample() instead.
6310  */
6312 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
6313 #endif /* FF_API_MISSING_SAMPLE */
6314 
6315 /**
6316  * Register the hardware accelerator hwaccel.
6317  */
6318 void av_register_hwaccel(AVHWAccel *hwaccel);
6319 
6320 /**
6321  * If hwaccel is NULL, returns the first registered hardware accelerator,
6322  * if hwaccel is non-NULL, returns the next registered hardware accelerator
6323  * after hwaccel, or NULL if hwaccel is the last one.
6324  */
6325 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6326 
6327 
6328 /**
6329  * Lock operation used by lockmgr
6330  */
6331 enum AVLockOp {
6332  AV_LOCK_CREATE, ///< Create a mutex
6333  AV_LOCK_OBTAIN, ///< Lock the mutex
6334  AV_LOCK_RELEASE, ///< Unlock the mutex
6335  AV_LOCK_DESTROY, ///< Free mutex resources
6336 };
6337 
6338 /**
6339  * Register a user provided lock manager supporting the operations
6340  * specified by AVLockOp. The "mutex" argument to the function points
6341  * to a (void *) where the lockmgr should store/get a pointer to a user
6342  * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6343  * value left by the last call for all other ops. If the lock manager is
6344  * unable to perform the op then it should leave the mutex in the same
6345  * state as when it was called and return a non-zero value. However,
6346  * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6347  * have been successfully destroyed. If av_lockmgr_register succeeds
6348  * it will return a non-negative value, if it fails it will return a
6349  * negative value and destroy all mutex and unregister all callbacks.
6350  * av_lockmgr_register is not thread-safe, it must be called from a
6351  * single thread before any calls which make use of locking are used.
6352  *
6353  * @param cb User defined callback. av_lockmgr_register invokes calls
6354  * to this callback and the previously registered callback.
6355  * The callback will be used to create more than one mutex
6356  * each of which must be backed by its own underlying locking
6357  * mechanism (i.e. do not use a single static object to
6358  * implement your lock manager). If cb is set to NULL the
6359  * lockmgr will be unregistered.
6360  */
6361 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6362 
6363 /**
6364  * Get the type of the given codec.
6365  */
6367 
6368 /**
6369  * Get the name of a codec.
6370  * @return a static string identifying the codec; never NULL
6371  */
6372 const char *avcodec_get_name(enum AVCodecID id);
6373 
6374 /**
6375  * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6376  * with no corresponding avcodec_close()), 0 otherwise.
6377  */
6379 
6380 /**
6381  * @return a non-zero number if codec is an encoder, zero otherwise
6382  */
6383 int av_codec_is_encoder(const AVCodec *codec);
6384 
6385 /**
6386  * @return a non-zero number if codec is a decoder, zero otherwise
6387  */
6388 int av_codec_is_decoder(const AVCodec *codec);
6389 
6390 /**
6391  * @return descriptor for given codec ID or NULL if no descriptor exists.
6392  */
6394 
6395 /**
6396  * Iterate over all codec descriptors known to libavcodec.
6397  *
6398  * @param prev previous descriptor. NULL to get the first descriptor.
6399  *
6400  * @return next descriptor or NULL after the last descriptor
6401  */
6403 
6404 /**
6405  * @return codec descriptor with the given name or NULL if no such descriptor
6406  * exists.
6407  */
6409 
6410 /**
6411  * Allocate a CPB properties structure and initialize its fields to default
6412  * values.
6413  *
6414  * @param size if non-NULL, the size of the allocated struct will be written
6415  * here. This is useful for embedding it in side data.
6416  *
6417  * @return the newly allocated struct or NULL on failure
6418  */
6420 
6421 /**
6422  * @}
6423  */
6424 
6425 #endif /* AVCODEC_AVCODEC_H */
codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it ...
Definition: avcodec.h:688
int caps_internal
Internal hwaccel capabilities.
Definition: avcodec.h:4003
enum AVChromaLocation chroma_location
Definition: avcodec.h:4242
attribute_deprecated int av_packet_split_side_data(AVPacket *pkt)
Definition: avpacket.c:434
void av_bsf_free(AVBSFContext **ctx)
Free a bitstream filter context and everything associated with it; write NULL into the supplied point...
Definition: bsf.c:35
int(* parser_init)(AVCodecParserContext *s)
Definition: avcodec.h:5337
const struct AVCodec * codec
Definition: avcodec.h:1770
AVRational framerate
Definition: avcodec.h:3460
const char const char void * val
Definition: avisynth_c.h:771
enum AVFieldOrder field_order
Video only.
Definition: avcodec.h:4233
discard all frames except keyframes
Definition: avcodec.h:829
AVSideDataParamChangeFlags
Definition: avcodec.h:1727
int(* start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Called at the beginning of each frame or field picture.
Definition: avcodec.h:3930
const AVCodecDescriptor * codec_descriptor
AVCodecDescriptor.
Definition: avcodec.h:3481
const char * s
Definition: avisynth_c.h:768
attribute_deprecated int intra_quant_bias
Definition: avcodec.h:2290
enum AVColorTransferCharacteristic color_trc
Definition: avcodec.h:4240
const AVClass * priv_class
A class for the private data, used to declare bitstream filter private AVOptions. ...
Definition: avcodec.h:5982
static enum AVPixelFormat pix_fmt
AVCodecParameters * par_out
Parameters of the output stream.
Definition: avcodec.h:5948
#define AV_NUM_DATA_POINTERS
Definition: frame.h:202
AVPacketSideDataType
Definition: avcodec.h:1405
int64_t pts_correction_num_faulty_dts
Number of incorrect PTS values so far.
Definition: avcodec.h:3498
A list of zero terminated key/value strings.
Definition: avcodec.h:1574
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
The optional first identifier line of a WebVTT cue.
Definition: avcodec.h:1561
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
AVCodec * avcodec_find_encoder(enum AVCodecID id)
Find a registered encoder with a matching codec ID.
Definition: utils.c:1256
int(* init)(AVCodecContext *avctx)
Initialize the hwaccel private data.
Definition: avcodec.h:3984
int x
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:4094
int dct_algo
DCT algorithm, see FF_DCT_* below.
Definition: avcodec.h:3108
A dummy id pointing at the start of audio codecs.
Definition: avcodec.h:453
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int apply_cropping
Video decoding only.
Definition: avcodec.h:3704
uint64_t error[AV_NUM_DATA_POINTERS]
error
Definition: avcodec.h:3101
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1963
int capabilities
Hardware accelerated codec capabilities.
Definition: avcodec.h:3900
const char * fmt
Definition: avisynth_c.h:769
void(* flush)(AVCodecContext *)
Flush buffers.
Definition: avcodec.h:3845
int av_lockmgr_register(int(*cb)(void **mutex, enum AVLockOp op))
Register a user provided lock manager supporting the operations specified by AVLockOp.
Definition: utils.c:1960
float qblur
amount of qscale smoothing over time (0.0-1.0)
Definition: avcodec.h:2698
static int linear(InterplayACMContext *s, unsigned ind, unsigned col)
Definition: interplayacm.c:121
Unlock the mutex.
Definition: avcodec.h:6334
attribute_deprecated int rc_qmod_freq
Definition: avcodec.h:2731
int64_t bit_rate
the average bitrate
Definition: avcodec.h:1826
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1699
void av_shrink_packet(AVPacket *pkt, int size)
Reduce packet size, correctly zeroing padding.
Definition: avpacket.c:101
attribute_deprecated void(* rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb)
Definition: avcodec.h:2888
Subtitle event position.
Definition: avcodec.h:1548
int64_t next_frame_offset
Definition: avcodec.h:5173
const char * desc
Definition: nvenc.c:60
int id
id
Definition: avcodec.h:1331
int max_bitrate
Maximum bitrate of the stream, in bits per second.
Definition: avcodec.h:1359
int max_b_frames
maximum number of B-frames between non-B-frames Note: The output will be delayed by max_b_frames+1 re...
Definition: avcodec.h:2047
AVRational sample_aspect_ratio
Video only.
Definition: avcodec.h:4228
int rc_initial_buffer_occupancy
Number of bits which should be loaded into the rc buffer before decoding starts.
Definition: avcodec.h:2801
Dummy codec for streams containing only metadata information.
Definition: avcodec.h:694
int height
Definition: avcodec.h:1339
int width
Dimensions of the decoded video intended for presentation.
Definition: avcodec.h:5314
int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
Read encoded data from the encoder.
Definition: encode.c:430
attribute_deprecated int frame_skip_cmp
Definition: avcodec.h:2853
attribute_deprecated int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples)
Definition: resample.c:285
This side data should be associated with a video stream and contains Stereoscopic 3D information in f...
Definition: avcodec.h:1479
const char * avcodec_configuration(void)
Return the libavcodec build-time configuration.
Definition: utils.c:1569
ATSC A53 Part 4 Closed Captions.
Definition: avcodec.h:1607
attribute_deprecated int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Filter bitstream.
enum AVColorRange color_range
MPEG vs JPEG YUV range.
Definition: avcodec.h:2498
attribute_deprecated unsigned int stream_codec_tag
Definition: avcodec.h:1800
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:4152
const struct AVBitStreamFilter * filter
The bitstream filter this context is an instance of.
Definition: avcodec.h:5923
int qscale
Definition: avcodec.h:852
enum AVFieldOrder field_order
Definition: avcodec.h:5291
attribute_deprecated int av_picture_crop(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
Definition: imgconvert.c:102
void av_codec_set_pkt_timebase(AVCodecContext *avctx, AVRational val)
The bitstream filter state.
Definition: avcodec.h:5914
int nb_colors
number of colors in pict, undefined when pict is not set
Definition: avcodec.h:4098
int size
Definition: avcodec.h:1680
attribute_deprecated int lmax
Definition: avcodec.h:2835
int mb_lmin
minimum MB Lagrange multiplier
Definition: avcodec.h:2401
const char * avcodec_license(void)
Return the libavcodec license.
Definition: utils.c:1574
int codec_ids[5]
Definition: avcodec.h:5335
enhanced predictive zonal search
Definition: avcodec.h:809
const AVBitStreamFilter * av_bsf_get_by_name(const char *name)
int coded_width
Dimensions of the coded video.
Definition: avcodec.h:5320
enum AVPixelFormat pix_fmt
Supported pixel format.
Definition: avcodec.h:3894
This side data contains an integer value representing the stream index of a "fallback" track...
Definition: avcodec.h:1505
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:2172
Structure for chain/list of bitstream filters.
Definition: bsf.c:389
attribute_deprecated int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of audio.
Definition: encode.c:118
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1989
Convenience header that includes libavutil's core.
attribute_deprecated int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, const AVPacket *avpkt)
Decode the audio frame of size avpkt->size from avpkt->data into frame.
Definition: decode.c:837
Contain timestamp estimated through PCR of program stream.
Definition: avcodec.h:677
unsigned num_rects
Definition: avcodec.h:4132
void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_malloc but the buffer has additional AV_INPUT_BUFFER_PADDING_SIZE at the end w...
Definition: utils.c:121
enum AVMediaType type
Type of codec implemented by the hardware accelerator.
Definition: avcodec.h:3880
A dummy ID pointing at the start of various fake codecs.
Definition: avcodec.h:674
char * stats_in
pass2 encoding statistics input buffer Concatenated stuff from stats_out of pass1 should be placed he...
Definition: avcodec.h:2939
int ildct_cmp
interlaced DCT comparison function
Definition: avcodec.h:2197
enum AVMediaType type
Definition: avcodec.h:3752
int(* decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt)
Definition: avcodec.h:3822
discard all non intra frames
Definition: avcodec.h:828
int duration
Duration of the current frame.
Definition: avcodec.h:5289
discard all
Definition: avcodec.h:830
attribute_deprecated void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Definition: imgconvert.c:38
static AVPacket pkt
int64_t cur_frame_pos[AV_PARSER_PTS_NB]
Position of the packet in file.
Definition: avcodec.h:5272
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
Definition: avcodec.h:3164
int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos)
Converts AVChromaLocation to swscale x/y chroma position.
Definition: utils.c:453
void avcodec_register_all(void)
Register all the codecs, parsers and bitstream filters which were enabled at configuration time...
Definition: allcodecs.c:755
int dts_ref_dts_delta
Offset of the current timestamp against last timestamp sync point in units of AVCodecContext.time_base.
Definition: avcodec.h:5251
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, AVPacket *avpkt)
Decode a subtitle message.
Definition: decode.c:1002
int av_bsf_get_null_filter(AVBSFContext **bsf)
Get null/pass-through bitstream filter.
Definition: bsf.c:539
int trailing_padding
Audio only.
Definition: avcodec.h:4288
void * priv_data
Opaque filter-specific private data.
Definition: avcodec.h:5935
Picture data structure.
Definition: avcodec.h:4061
#define src
Definition: vp8dsp.c:254
int profile
profile
Definition: avcodec.h:3266
An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of structures with info about macroblo...
Definition: avcodec.h:1458
AVCodec.
Definition: avcodec.h:3739
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2560
attribute_deprecated int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int *color)
Definition: imgconvert.c:133
float i_quant_offset
qscale offset between P and I-frames
Definition: avcodec.h:2105
This struct describes the properties of an encoded stream.
Definition: avcodec.h:4144
int av_bsf_init(AVBSFContext *ctx)
Prepare the filter for use, after all the parameters and options have been set.
Definition: bsf.c:134
AVLockOp
Lock operation used by lockmgr.
Definition: avcodec.h:6331
attribute_deprecated AVPicture pict
Definition: avcodec.h:4105
AVColorTransferCharacteristic
Color Transfer Characteristic.
Definition: pixfmt.h:455
int min_bitrate
Minimum bitrate of the stream, in bits per second.
Definition: avcodec.h:1364
char * text
0 terminated plain UTF-8 text
Definition: avcodec.h:4116
enum AVColorSpace color_space
Definition: avcodec.h:4241
attribute_deprecated unsigned avcodec_get_edge_width(void)
Return the amount of padding in pixels which the get_buffer callback must provide around the edge of ...
Definition: utils.c:195
attribute_deprecated int frame_skip_exp
Definition: avcodec.h:2849
attribute_deprecated int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:57
attribute_deprecated int me_method
This option does nothing.
Definition: avcodec.h:1996
Macro definitions for various function/variable attributes.
attribute_deprecated void av_log_missing_feature(void *avc, const char *feature, int want_sample)
Log a generic warning message about a missing feature.
Definition: utils.c:1916
int frame_size
Audio only.
Definition: avcodec.h:4273
Mastering display metadata (based on SMPTE-2086:2014).
Definition: avcodec.h:1587
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1898
int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)
Definition: imgconvert.c:47
attribute_deprecated int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx)
Resample an array of samples using a previously configured context.
Definition: resample2.c:237
int av_codec_is_decoder(const AVCodec *codec)
Definition: utils.c:174
AVSubtitleRect ** rects
Definition: avcodec.h:4133
enum AVAudioServiceType audio_service_type
Type of service that the audio stream conveys.
Definition: avcodec.h:2588
const AVCodecDescriptor * avcodec_descriptor_next(const AVCodecDescriptor *prev)
Iterate over all codec descriptors known to libavcodec.
Definition: codec_desc.c:3131
void av_bsf_list_free(AVBSFList **lst)
Free list of bitstream filters.
Definition: bsf.c:399
int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, enum AVSampleFormat sample_fmt, const uint8_t *buf, int buf_size, int align)
Fill AVFrame audio data and linesize pointers.
Definition: utils.c:476
enum AVDiscard skip_frame
Skip decoding for selected frames.
Definition: avcodec.h:3386
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:295
int av_codec_is_encoder(const AVCodec *codec)
Definition: utils.c:169
uint64_t vbv_delay
The delay between the time the packet this structure is associated with is received and the time when...
Definition: avcodec.h:1384
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx)
Allocate a context for a given bitstream filter.
Definition: bsf.c:81
void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:438
int w
width of pict, undefined when pict is not set
Definition: avcodec.h:4096
attribute_deprecated int mv_bits
Definition: avcodec.h:2905
struct AVHWAccel * hwaccel
Hardware accelerator in use.
Definition: avcodec.h:3082
float p_masking
p block masking (0-> disabled)
Definition: avcodec.h:2133
void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val)
AVCodecParserContext * parser
Definition: avcodec.h:5892
attribute_deprecated int rc_strategy
Definition: avcodec.h:2060
attribute_deprecated char codec_name[32]
Definition: avcodec.h:1776
Public dictionary API.
int(* init_thread_copy)(AVCodecContext *)
If defined, called on thread contexts when they are created.
Definition: avcodec.h:3786
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:106
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
Retrieve a filtered packet.
Definition: bsf.c:196
attribute_deprecated int side_data_only_packets
Encoding only and set by default.
Definition: avcodec.h:3433
int bit_rate_tolerance
number of bits the bitstream is allowed to diverge from the reference.
Definition: avcodec.h:1834
int mb_lmax
maximum MB Lagrange multiplier
Definition: avcodec.h:2408
enum AVPictureStructure picture_structure
Indicate whether a picture is coded as a frame, top field or bottom field.
Definition: avcodec.h:5301
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:62
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
Definition: decode.c:1125
attribute_deprecated float rc_buffer_aggressivity
Definition: avcodec.h:2776
attribute_deprecated const char * rc_eq
Definition: avcodec.h:2754
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2531
Lock the mutex.
Definition: avcodec.h:6333
uint8_t
void * hwaccel_context
Hardware accelerator context.
Definition: avcodec.h:3094
int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
Unpack a dictionary from side_data.
Definition: avpacket.c:545
int width
Video only.
Definition: avcodec.h:4218
int av_parser_change(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: parser.c:206
attribute_deprecated int av_packet_merge_side_data(AVPacket *pkt)
Definition: avpacket.c:399
int subtitle_header_size
Definition: avcodec.h:3397
AVCodecParameters * avcodec_parameters_alloc(void)
Allocate a new AVCodecParameters and set its fields to default values (unknown/invalid/0).
Definition: utils.c:2258
int me_range
maximum motion estimation search range in subpel units If 0 then no limit.
Definition: avcodec.h:2284
attribute_deprecated int i_count
Definition: avcodec.h:2913
AVColorSpace
YUV colorspace type.
Definition: pixfmt.h:484
unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt)
Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found.
Definition: raw.c:298
uint16_t * chroma_intra_matrix
custom intra quantization matrix
Definition: avcodec.h:3558
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1697
This side data contains a 3x3 transformation matrix describing an affine transformation that needs to...
Definition: avcodec.h:1473
float b_quant_factor
qscale factor between IP and B-frames If > 0 then the last P-frame quantizer will be used (q= lastp_q...
Definition: avcodec.h:2056
int trailing_padding
Audio only.
Definition: avcodec.h:3638
attribute_deprecated int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:4065
int pre_dia_size
ME prepass diamond size & shape.
Definition: avcodec.h:2248
int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
Initialize a reference-counted packet from av_malloc()ed data.
Definition: avpacket.c:152
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1876
const AVClass * av_class
information on struct for av_log
Definition: avcodec.h:1766
int me_cmp
motion estimation comparison function
Definition: avcodec.h:2179
static void filter(int16_t *output, ptrdiff_t out_stride, int16_t *low, ptrdiff_t low_stride, int16_t *high, ptrdiff_t high_stride, int len, uint8_t clip)
Definition: cfhd.c:80
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: utils.c:2354
static AVFrame * frame
struct AVCodecParser * next
Definition: avcodec.h:5346
int initial_padding
Audio only.
Definition: avcodec.h:4281
void av_codec_set_lowres(AVCodecContext *avctx, int val)
const char * name
Definition: avcodec.h:5964
attribute_deprecated void av_resample_close(struct AVResampleContext *c)
Definition: resample2.c:226
#define height
uint8_t * data
Definition: avcodec.h:1679
attribute_deprecated int context_model
Definition: avcodec.h:2821
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:673
static int flags
Definition: log.c:57
void(* decode_mb)(struct MpegEncContext *s)
Called for every Macroblock in a slice.
Definition: avcodec.h:3975
Motion_Est_ID
motion estimation type.
Definition: avcodec.h:804
uint8_t * data
Definition: avcodec.h:1623
int(* parser_parse)(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: avcodec.h:5340
int lowres
low resolution decoding, 1-> 1/2 size, 2->1/4 size
Definition: avcodec.h:3172
AVColorRange
MPEG vs JPEG YUV range.
Definition: pixfmt.h:507
const AVCodecDescriptor * av_codec_get_codec_descriptor(const AVCodecContext *avctx)
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
Definition: options.c:322
int buffer_size
The size of the buffer to which the ratecontrol is applied, in bits.
Definition: avcodec.h:1375
ptrdiff_t size
Definition: opengl_enc.c:101
int h
height of pict, undefined when pict is not set
Definition: avcodec.h:4097
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3157
float lumi_masking
luminance masking (0-> disabled)
Definition: avcodec.h:2112
char * stats_out
pass1 encoding statistics output buffer
Definition: avcodec.h:2931
AVColorPrimaries
Chromaticity coordinates of the source primaries.
Definition: pixfmt.h:431
AVCPBProperties * av_cpb_properties_alloc(size_t *size)
Allocate a CPB properties structure and initialize its fields to default values.
Definition: utils.c:2198
const OptionDef options[]
Definition: ffserver.c:3948
struct AVBitStreamFilterContext * next
Definition: avcodec.h:5893
enum AVChromaLocation chroma_sample_location
This defines the location of chroma samples.
Definition: avcodec.h:2505
attribute_deprecated int frame_skip_threshold
Definition: avcodec.h:2841
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4254
float quality_factor
Definition: avcodec.h:853
int av_packet_ref(AVPacket *dst, const AVPacket *src)
Setup a new reference to the data described by a given packet.
Definition: avpacket.c:627
hexagon based search
Definition: avcodec.h:811
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:4181
AVCodec * avcodec_find_encoder_by_name(const char *name)
Find a registered encoder with the specified name.
Definition: utils.c:1261
attribute_deprecated int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src)
Copy packet side data.
Definition: avpacket.c:226
void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[AV_NUM_DATA_POINTERS])
Modify width and height values so that they will result in a memory buffer that is acceptable for the...
Definition: utils.c:261
attribute_deprecated int avpicture_fill(AVPicture *picture, const uint8_t *ptr, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:37
attribute_deprecated int skip_count
Definition: avcodec.h:2917
MPEGTS stream ID, this is required to pass the stream ID information from the demuxer to the correspo...
Definition: avcodec.h:1580
int slice_count
slice count
Definition: avcodec.h:2147
uint16_t * av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx)
int(* send_frame)(AVCodecContext *avctx, const AVFrame *frame)
Encode API with decoupled packet/frame dataflow.
Definition: avcodec.h:3832
attribute_deprecated void avcodec_set_dimensions(AVCodecContext *s, int width, int height)
Definition: utils.c:202
Libavcodec version macros.
int(* close)(AVCodecContext *)
Definition: avcodec.h:3823
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
Definition: utils.c:1163
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
Definition: avcodec.h:3474
no search, that is use 0,0 vector whenever one is needed
Definition: avcodec.h:805
enum AVCodecID id
Definition: avcodec.h:3753
const uint64_t * channel_layouts
array of support channel layouts, or NULL if unknown. array is terminated by 0
Definition: avcodec.h:3763
reserved for experiments
Definition: avcodec.h:810
const AVCodecDefault * defaults
Private codec-specific defaults.
Definition: avcodec.h:3800
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:214
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
Copy the contents of src to dst.
Definition: utils.c:2279
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1662
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:2083
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
Definition: avcodec.h:1411
AVPacket * av_packet_clone(const AVPacket *src)
Create a new packet that references the same data as src.
Definition: avpacket.c:660
const AVBitStreamFilter * av_bsf_next(void **opaque)
Iterate over all registered bitstream filters.
int64_t pos
Byte position of currently parsed frame in stream.
Definition: avcodec.h:5277
attribute_deprecated float rc_initial_cplx
Definition: avcodec.h:2779
Create a mutex.
Definition: avcodec.h:6332
void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst)
Convert valid timing fields (timestamps / durations) in a packet from one timebase to another...
Definition: avpacket.c:681
int priv_data_size
Definition: avcodec.h:5336
struct AVCodecParser * parser
Definition: avcodec.h:5169
AVAudioServiceType
Definition: avcodec.h:833
int y
top left corner of pict, undefined when pict is not set
Definition: avcodec.h:4095
discard all bidirectional frames
Definition: avcodec.h:827
An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
Definition: avcodec.h:1437
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
Definition: avpacket.c:350
enum AVCodecID * codec_ids
A list of codec ids supported by the filter, terminated by AV_CODEC_ID_NONE.
Definition: avcodec.h:5971
int me_sub_cmp
subpixel motion estimation comparison function
Definition: avcodec.h:2185
void av_packet_free_side_data(AVPacket *pkt)
Convenience function to free all the side data stored.
Definition: avpacket.c:270
attribute_deprecated uint64_t vbv_delay
VBV delay coded in the last frame (in periods of a 27 MHz clock).
Definition: avcodec.h:3418
int qmax
maximum quantizer
Definition: avcodec.h:2712
AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
Definition: utils.c:149
enum AVSampleFormat request_sample_fmt
desired sample format
Definition: avcodec.h:2596
int skip_alpha
Skip processing alpha if supported by codec.
Definition: avcodec.h:3532
int64_t pts_correction_last_pts
Number of incorrect DTS values so far.
Definition: avcodec.h:3499
int active_thread_type
Which multithreading methods are in use by the codec.
Definition: avcodec.h:3211
enum AVColorPrimaries color_primaries
Definition: avcodec.h:4239
attribute_deprecated int av_dup_packet(AVPacket *pkt)
Definition: avpacket.c:251
int avcodec_is_open(AVCodecContext *s)
Definition: utils.c:2137
int error_concealment
error concealment flags
Definition: avcodec.h:2993
int video_delay
Video only.
Definition: avcodec.h:4247
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:713
int capabilities
Codec capabilities.
Definition: avcodec.h:3758
int initial_padding
Audio only.
Definition: avcodec.h:3451
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:557
attribute_deprecated AVBitStreamFilterContext * av_bitstream_filter_init(const char *name)
Create and initialize a bitstream filter context given a bitstream filter name.
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:4148
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1662
const char * arg
Definition: jacosubdec.c:66
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1856
enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Find the best pixel format to convert to given a certain source pixel format.
Definition: imgconvert.c:66
uint16_t width
Definition: gdv.c:47
AVRational time_base_in
The timebase used for the timestamps of the input packets.
Definition: avcodec.h:5954
int log_level_offset
Definition: avcodec.h:1767
enum AVPacketSideDataType type
Definition: avcodec.h:1625
enum AVMediaType avcodec_get_type(enum AVCodecID codec_id)
Get the type of the given codec.
Definition: codec_desc.c:3150
attribute_deprecated int inter_quant_bias
Definition: avcodec.h:2296
const char * name
Name of the codec implementation.
Definition: avcodec.h:3746
int64_t cur_frame_dts[AV_PARSER_PTS_NB]
Definition: avcodec.h:5198
float i_quant_factor
qscale factor between P- and I-frames If > 0 then the last P-frame quantizer will be used (q = lastp_...
Definition: avcodec.h:2098
int side_data_elems
Definition: avcodec.h:1691
int width
width and height in 1/16 pel
Definition: avcodec.h:1338
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:3646
int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Shrink the already allocated side data buffer.
Definition: avpacket.c:570
const struct AVProfile * profiles
If non-NULL, an array of profiles recognized for this codec.
Definition: avcodec.h:730
const char * long_name
A more descriptive name for this codec.
Definition: avcodec.h:715
int(* init)(AVBSFContext *ctx)
Definition: avcodec.h:5993
AVCodecParser * av_parser_next(const AVCodecParser *c)
Definition: parser.c:37
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
GLsizei count
Definition: opengl_enc.c:109
transformed exhaustive search algorithm
Definition: avcodec.h:813
void avcodec_parameters_free(AVCodecParameters **par)
Free an AVCodecParameters instance and everything associated with it and write NULL to the supplied p...
Definition: utils.c:2268
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
Definition: utils.c:1876
attribute_deprecated int64_t timecode_frame_start
Definition: avcodec.h:2874
int compensation_distance
Definition: resample2.c:71
#define av_printf_format(fmtpos, attrpos)
Definition: attributes.h:155
attribute_deprecated int b_sensitivity
Definition: avcodec.h:2469
int priv_data_size
Size of the private data to allocate in AVCodecInternal.hwaccel_priv_data.
Definition: avcodec.h:3998
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1685
int av_codec_get_lowres(const AVCodecContext *avctx)
reference-counted frame API
const AVCodecDescriptor * avcodec_descriptor_get(enum AVCodecID id)
Definition: codec_desc.c:3121
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2574
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:4170
uint32_t end_display_time
Definition: avcodec.h:4131
int64_t pts
Same as packet pts, in AV_TIME_BASE.
Definition: avcodec.h:4134
int rc_buffer_size
decoder bitstream buffer size
Definition: avcodec.h:2739
attribute_deprecated int av_copy_packet(AVPacket *dst, const AVPacket *src)
Copy packet, including contents.
Definition: avpacket.c:262
int props
Codec properties, a combination of AV_CODEC_PROP_* flags.
Definition: avcodec.h:719
int intra_dc_precision
precision of the intra DC coefficient - 8
Definition: avcodec.h:2372
int(* encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, const struct AVSubtitle *sub)
Definition: avcodec.h:3808
int64_t rc_min_rate
minimum bitrate
Definition: avcodec.h:2769
Not part of ABI.
Definition: avcodec.h:843
int refs
number of reference frames
Definition: avcodec.h:2442
attribute_deprecated int scenechange_factor
Multiplied by qscale for each frame and added to scene_change_score.
Definition: avcodec.h:2456
int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
Append bitstream filter to the list of bitstream filters.
Definition: bsf.c:412
int block_align
Audio only.
Definition: avcodec.h:4269
A bitmap, pict will be set.
Definition: avcodec.h:4076
int linesize[4]
Definition: avcodec.h:4112
int av_packet_copy_props(AVPacket *dst, const AVPacket *src)
Copy only "properties" fields from src to dst.
Definition: avpacket.c:586
int rc_override_count
ratecontrol override, see RcOverride
Definition: avcodec.h:2746
void(* draw_horiz_band)(struct AVCodecContext *s, const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], int y, int type, int height)
If non NULL, 'draw_horiz_band' is called by the libavcodec decoder to draw a horizontal band...
Definition: avcodec.h:2022
const AVClass * av_bsf_get_class(void)
Get the AVClass for AVBSFContext.
Definition: bsf.c:76
audio channel layout utility functions
enum AVPixelFormat * pix_fmts
array of supported pixel formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3760
int err_recognition
Error recognition; may misdetect some more or less valid parts as errors.
Definition: avcodec.h:3050
const char * name
Name of the hardware accelerated codec.
Definition: avcodec.h:3873
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
Definition: avcodec.h:3591
attribute_deprecated int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
Definition: avpicture.c:44
iterative search
Definition: avcodec.h:814
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1580
attribute_deprecated int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
Definition: options.c:216
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:157
int av_parser_parse2(AVCodecParserContext *s, AVCodecContext *avctx, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int64_t pts, int64_t dts, int64_t pos)
Parse a packet.
Definition: parser.c:137
This side data contains quality related information from the encoder.
Definition: avcodec.h:1497
int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary **options)
Construct new bitstream filter context given it's name and options and append it to the list of bitst...
Definition: bsf.c:417
int(* alloc_frame)(AVCodecContext *avctx, AVFrame *frame)
Allocate a custom buffer.
Definition: avcodec.h:3914
attribute_deprecated void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance)
Compensate samplerate/timestamp drift.
Definition: resample2.c:231
int width
picture width / height.
Definition: avcodec.h:1948
void(* parser_close)(AVCodecParserContext *s)
Definition: avcodec.h:5344
int idct_algo
IDCT algorithm, see FF_IDCT_* below.
Definition: avcodec.h:3121
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames...
Definition: avcodec.h:3616
int64_t offset
byte offset from starting packet start
Definition: avcodec.h:5207
attribute_deprecated void av_bitstream_filter_close(AVBitStreamFilterContext *bsf)
Release bitstream filter context.
AVRational time_base_out
The timebase used for the timestamps of the output packets.
Definition: avcodec.h:5960
int priv_data_size
Definition: avcodec.h:3775
int profile
Definition: avcodec.h:3728
attribute_deprecated int noise_reduction
Definition: avcodec.h:2350
This side data should be associated with a video stream and corresponds to the AVSphericalMapping str...
Definition: avcodec.h:1593
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
Submit a packet for filtering.
Definition: bsf.c:175
float rc_max_available_vbv_use
Ratecontrol attempt to use, at maximum, of what can be used without an underflow. ...
Definition: avcodec.h:2787
float rc_min_vbv_overflow_use
Ratecontrol attempt to use, at least, times the amount needed to prevent a vbv overflow.
Definition: avcodec.h:2794
AVFormatContext * ctx
Definition: movenc.c:48
void av_parser_close(AVCodecParserContext *s)
Definition: parser.c:241
attribute_deprecated int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:52
enum AVColorPrimaries color_primaries
Chromaticity coordinates of the source primaries.
Definition: avcodec.h:2477
int start_frame
Definition: avcodec.h:850
attribute_deprecated int frame_skip_factor
Definition: avcodec.h:2845
uint16_t format
Definition: avcodec.h:4129
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
Definition: options.c:347
int level
level
Definition: avcodec.h:3364
const AVClass * av_class
A class for logging and AVOptions.
Definition: avcodec.h:5918
const AVProfile * profiles
array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} ...
Definition: avcodec.h:3766
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Definition: avcodec.h:3075
int ticks_per_frame
For some codecs, the time base is closer to the field rate than the frame rate.
Definition: avcodec.h:1907
const char * bsfs
Decoding only, a comma-separated list of bitstream filters to apply to packets before decoding...
Definition: avcodec.h:3856
int skip_top
Number of macroblock rows at the top which are skipped.
Definition: avcodec.h:2379
enum AVCodecID codec_id
Definition: vaapi_decode.c:235
enum AVColorRange color_range
Video only.
Definition: avcodec.h:4238
int mb_decision
macroblock decision mode
Definition: avcodec.h:2324
int last_predictor_count
amount of previous MV predictors (2a+1 x 2a+1 square)
Definition: avcodec.h:2228
int max_qdiff
maximum quantizer difference between frames
Definition: avcodec.h:2719
attribute_deprecated int mb_threshold
Definition: avcodec.h:2364
attribute_deprecated float rc_qsquish
Definition: avcodec.h:2726
int64_t cur_frame_end[AV_PARSER_PTS_NB]
Definition: avcodec.h:5208
Passthrough codec, AVFrames wrapped in AVPacket.
Definition: avcodec.h:695
static pthread_mutex_t * mutex
Definition: w32pthreads.h:258
char * sub_charenc
DTS of the last frame.
Definition: avcodec.h:3507
int64_t cur_frame_pts[AV_PARSER_PTS_NB]
Definition: avcodec.h:5197
attribute_deprecated int coder_type
Definition: avcodec.h:2815
preferred ID for MPEG-1/2 video decoding
Definition: avcodec.h:219
const AVCodecDescriptor * avcodec_descriptor_get_by_name(const char *name)
Definition: codec_desc.c:3140
RcOverride * rc_override
Definition: avcodec.h:2747
int64_t last_pos
Previous frame byte position.
Definition: avcodec.h:5282
const char * avcodec_get_name(enum AVCodecID id)
Get the name of a codec.
Definition: utils.c:1294
int thread_count
thread count is used to decide how many independent tasks should be passed to execute() ...
Definition: avcodec.h:3192
int sub_charenc_mode
Subtitles character encoding mode.
Definition: avcodec.h:3515
attribute_deprecated int max_prediction_order
Definition: avcodec.h:2870
int av_codec_get_max_lowres(const AVCodec *codec)
Definition: utils.c:583
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal decoder state / flush internal buffers.
Definition: decode.c:1726
FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)
Definition: avcodec.h:692
const AVS_VideoInfo int align
Definition: avisynth_c.h:795
attribute_deprecated int i_tex_bits
Definition: avcodec.h:2909
enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:54
attribute_deprecated enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)
Definition: imgconvert.c:60
Content light level (based on CTA-861.3).
Definition: avcodec.h:1600
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:646
const char * av_get_profile_name(const AVCodec *codec, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:1529
int frame_size
Number of samples per channel in an audio frame.
Definition: avcodec.h:2543
int pts_dts_delta
Presentation delay of current frame in units of AVCodecContext.time_base.
Definition: avcodec.h:5265
attribute_deprecated int misc_bits
Definition: avcodec.h:2919
const char * long_name
Descriptive name for the codec, meant to be more human readable than name.
Definition: avcodec.h:3751
This structure describes the bitrate properties of an encoded bitstream.
Definition: avcodec.h:1354
AVBSFList * av_bsf_list_alloc(void)
Allocate empty list of bitstream filters.
Definition: bsf.c:394
The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format that the extradata buffer was...
Definition: avcodec.h:1420
int bidir_refine
Definition: avcodec.h:2422
attribute_deprecated void av_log_ask_for_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message asking for a sample.
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:52
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Definition: decode.c:1447
enum AVMediaType codec_type
Definition: avcodec.h:1769
void(* init_static_data)(struct AVCodec *codec)
Initialize codec static data, called from avcodec_register().
Definition: avcodec.h:3805
attribute_deprecated int mpeg_quant
Definition: avcodec.h:2088
const AVRational * supported_framerates
array of supported framerates, or NULL if any, array is terminated by {0,0}
Definition: avcodec.h:3759
A list of zero terminated key/value strings.
Definition: avcodec.h:1537
attribute_deprecated int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt)
Decode the video frame of size avpkt->size from avpkt->data into picture.
Definition: decode.c:830
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
attribute_deprecated int scenechange_threshold
Definition: avcodec.h:2346
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
Definition: options.c:172
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:1640
enum AVCodecID codec_id
Definition: avcodec.h:1778
int compression_level
Definition: avcodec.h:1848
int seek_preroll
Number of samples to skip after a discontinuity.
Definition: avcodec.h:3539
attribute_deprecated int prediction_method
Definition: avcodec.h:2152
void(* close)(AVBSFContext *ctx)
Definition: avcodec.h:5995
int sample_rate
samples per second
Definition: avcodec.h:2523
enum AVDiscard skip_idct
Skip IDCT/dequantization for selected frames.
Definition: avcodec.h:3379
attribute_deprecated int b_frame_strategy
Definition: avcodec.h:2067
Plain text, the text field must be set by the decoder and is authoritative.
Definition: avcodec.h:4082
int debug
debug
Definition: avcodec.h:3003
main external API structure.
Definition: avcodec.h:1761
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: utils.c:1275
uint8_t * av_packet_pack_dictionary(AVDictionary *dict, int *size)
Pack a dictionary for use in side_data.
Definition: avpacket.c:510
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:618
int output_channels
Definition: resample.c:58
int qmin
minimum quantizer
Definition: avcodec.h:2705
attribute_deprecated ReSampleContext * av_audio_resample_init(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, enum AVSampleFormat sample_fmt_in, int filter_length, int log2_phase_count, int linear, double cutoff)
Initialize audio resampling context.
Definition: resample.c:204
void avsubtitle_free(AVSubtitle *sub)
Free all allocated data in the given subtitle struct.
Definition: utils.c:1144
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1793
static void encode(AVCodecContext *ctx, AVFrame *frame, AVPacket *pkt, FILE *output)
Definition: encode_audio.c:95
int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame)
Supply a raw video or audio frame to the encoder.
Definition: encode.c:400
float spatial_cplx_masking
spatial complexity masking (0-> disabled)
Definition: avcodec.h:2126
void * buf
Definition: avisynth_c.h:690
Data found in BlockAdditional element of matroska container.
Definition: avcodec.h:1556
attribute_deprecated int header_bits
Definition: avcodec.h:2907
GLint GLenum type
Definition: opengl_enc.c:105
int extradata_size
Definition: avcodec.h:1877
unsigned int av_xiphlacing(unsigned char *s, unsigned int v)
Encode extradata length to a buffer.
Definition: utils.c:1893
struct AVCodec * next
Definition: avcodec.h:3776
uint16_t * intra_matrix
custom intra quantization matrix
Definition: avcodec.h:2334
int nb_coded_side_data
Definition: avcodec.h:3592
int slice_flags
slice flags
Definition: avcodec.h:2304
int coded_height
Definition: avcodec.h:1963
Describe the class of an AVClass context structure.
Definition: log.h:67
enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
Definition: avcodec.h:2039
enum AVColorSpace colorspace
YUV colorspace type.
Definition: avcodec.h:2491
Rational number (pair of numerator and denominator).
Definition: rational.h:58
attribute_deprecated int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode a frame of video.
Definition: encode.c:267
enum AVColorTransferCharacteristic color_trc
Color Transfer Characteristic.
Definition: avcodec.h:2484
const char * name
short name for the profile
Definition: avcodec.h:3729
int avcodec_parameters_from_context(AVCodecParameters *par, const AVCodecContext *codec)
Fill the parameters struct based on the values from the supplied codec context.
Definition: utils.c:2297
void av_register_codec_parser(AVCodecParser *parser)
Definition: parser.c:45
AVFieldOrder
Definition: avcodec.h:1739
Recommmends skipping the specified number of samples.
Definition: avcodec.h:1521
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type, uint8_t *data, size_t size)
Wrap an existing array as a packet side data.
Definition: avpacket.c:295
int(* filter)(AVBSFContext *ctx, AVPacket *pkt)
Definition: avcodec.h:5994
int sub_text_format
Control the form of AVSubtitle.rects[N]->ass.
Definition: avcodec.h:3623
attribute_deprecated void audio_resample_close(ReSampleContext *s)
Free resample context.
Definition: resample.c:425
int(* func)(AVBPrint *dst, const char *in, const char *arg)
Definition: jacosubdec.c:67
AVMediaType
Definition: avutil.h:199
discard useless packets like 0 size packets in avi
Definition: avcodec.h:825
refcounted data buffer API
attribute_deprecated int brd_scale
Definition: avcodec.h:2427
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Definition: avcodec.h:2678
char * codec_whitelist
',' separated list of allowed decoders.
Definition: avcodec.h:3574
const char * name
Name of the codec described by this descriptor.
Definition: avcodec.h:711
int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: utils.c:627
attribute_deprecated int chromaoffset
Definition: avcodec.h:2447
float b_quant_offset
qscale offset between IP and B-frames
Definition: avcodec.h:2075
attribute_deprecated int dtg_active_format
DTG active format information (additional aspect ratio information only used in DVB MPEG-2 transport ...
Definition: avcodec.h:2267
#define AV_PARSER_PTS_NB
Definition: avcodec.h:5194
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
Return audio frame duration.
Definition: utils.c:1867
float qcompress
amount of qscale change between easy & hard scenes (0.0-1.0)
Definition: avcodec.h:2697
attribute_deprecated int refcounted_frames
If non-zero, the decoded audio and video frames returned from avcodec_decode_video2() and avcodec_dec...
Definition: avcodec.h:2694
attribute_deprecated int me_threshold
Definition: avcodec.h:2358
attribute_deprecated int p_tex_bits
Definition: avcodec.h:2911
uint16_t * inter_matrix
custom inter quantization matrix
Definition: avcodec.h:2341
int end_frame
Definition: avcodec.h:851
mfxU16 profile
Definition: qsvenc.c:44
AVHWAccel * av_hwaccel_next(const AVHWAccel *hwaccel)
If hwaccel is NULL, returns the first registered hardware accelerator, if hwaccel is non-NULL...
Definition: utils.c:1955
attribute_deprecated int64_t convergence_duration
Definition: avcodec.h:5223
int seek_preroll
Audio only.
Definition: avcodec.h:4292
This struct describes the properties of a single codec described by an AVCodecID. ...
Definition: avcodec.h:703
float dark_masking
darkness masking (0-> disabled)
Definition: avcodec.h:2140
int global_quality
Global quality for codecs which cannot change it per frame.
Definition: avcodec.h:1842
static int64_t pts
Global timestamp for the audio frames.
int skip_bottom
Number of macroblock rows at the bottom which are skipped.
Definition: avcodec.h:2386
AVCodec * avcodec_find_decoder_by_name(const char *name)
Find a registered decoder with the specified name.
Definition: utils.c:1280
This side data should be associated with an audio stream and contains ReplayGain information in form ...
Definition: avcodec.h:1464
int output_picture_number
Picture number incremented in presentation or output order.
Definition: avcodec.h:5309
float temporal_cplx_masking
temporary complexity masking (0-> disabled)
Definition: avcodec.h:2119
int input_channels
Definition: resample.c:58
int bits_per_raw_sample
This is the number of valid bits in each output sample.
Definition: avcodec.h:4207
Pan Scan area.
Definition: avcodec.h:1325
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3765
#define attribute_deprecated
Definition: attributes.h:94
MpegEncContext.
Definition: mpegvideo.h:78
struct AVCodecContext * avctx
Definition: mpegvideo.h:95
int gop_size
the number of pictures in a group of pictures, or 0 for intra_only
Definition: avcodec.h:1974
int sample_rate
Audio only.
Definition: avcodec.h:4262
enum AVMediaType type
Definition: avcodec.h:705
uint8_t max_lowres
maximum value for lowres supported by the decoder
Definition: avcodec.h:3764
A reference to a data buffer.
Definition: buffer.h:81
discard all non reference
Definition: avcodec.h:826
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
Definition: anm.c:78
attribute_deprecated struct AVResampleContext * av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff)
Initialize an audio resampler.
Definition: resample2.c:192
An AV_PKT_DATA_JP_DUALMONO side data packet indicates that the packet may contain "dual mono" audio s...
Definition: avcodec.h:1531
AVPacketSideData * side_data
Additional packet data that can be provided by the container.
Definition: avcodec.h:1690
int
attribute_deprecated int64_t convergence_duration
Definition: avcodec.h:1708
int mb_cmp
macroblock comparison function (not supported yet)
Definition: avcodec.h:2191
int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf)
Parse string describing list of bitstream filters and create single AVBSFContext describing the whole...
Definition: bsf.c:501
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:5345
enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos)
Converts swscale x/y chroma position to AVChromaLocation.
Definition: utils.c:465
AVRational av_codec_get_pkt_timebase(const AVCodecContext *avctx)
Free mutex resources.
Definition: avcodec.h:6335
Utilties for rational number calculation.
attribute_deprecated void void av_register_hwaccel(AVHWAccel *hwaccel)
Register the hardware accelerator hwaccel.
Definition: utils.c:1946
attribute_deprecated void avpicture_free(AVPicture *picture)
Definition: avpicture.c:70
raw UTF-8 text
Definition: avcodec.h:649
struct AVHWAccel * next
Definition: avcodec.h:3909
attribute_deprecated int rtp_payload_size
Definition: avcodec.h:2894
int nsse_weight
noise vs.
Definition: avcodec.h:3259
static double c[64]
int profile
Codec-specific bitstream restrictions that the stream conforms to.
Definition: avcodec.h:4212
int(* uninit)(AVCodecContext *avctx)
Uninitialize the hwaccel private data.
Definition: avcodec.h:3992
attribute_deprecated float border_masking
Definition: avcodec.h:2393
uint32_t start_display_time
Definition: avcodec.h:4130
int av_codec_get_seek_preroll(const AVCodecContext *avctx)
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call...
Definition: utils.c:133
void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc)
AVProfile.
Definition: avcodec.h:3727
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:3183
int workaround_bugs
Work around bugs in encoders which sometimes cannot be detected automatically.
Definition: avcodec.h:2946
enum AVCodecID id
Codec implemented by the hardware accelerator.
Definition: avcodec.h:3887
attribute_deprecated AVBitStreamFilter * av_bitstream_filter_next(const AVBitStreamFilter *f)
If f is NULL, return the first registered bitstream filter, if f is non-NULL, return the next registe...
static const uint64_t c2
Definition: murmur3.c:50
int64_t cur_frame_offset[AV_PARSER_PTS_NB]
Definition: avcodec.h:5196
int av_grow_packet(AVPacket *pkt, int grow_by)
Increase packet size, correctly zeroing padding.
Definition: avpacket.c:109
int caps_internal
Internal codec capabilities.
Definition: avcodec.h:3850
unsigned properties
Properties of the stream that gets decoded.
Definition: avcodec.h:3581
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
enum AVDiscard skip_loop_filter
Skip loop filtering for selected frames.
Definition: avcodec.h:3372
int thread_safe_callbacks
Set by the client if its custom get_buffer() callback can be called synchronously from another thread...
Definition: avcodec.h:3221
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
Definition: options.c:151
attribute_deprecated float rc_qmod_amp
Definition: avcodec.h:2729
AVPictureStructure
Definition: avcodec.h:5160
attribute_deprecated void av_picture_copy(AVPicture *dst, const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height)
Definition: avpicture.c:75
int trellis
trellis RD quantization
Definition: avcodec.h:2861
The optional settings (rendering instructions) that immediately follow the timestamp specifier of a W...
Definition: avcodec.h:1567
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
Definition: utils.c:1334
int slices
Number of slices.
Definition: avcodec.h:2514
int16_t position[3][2]
position of the top left corner in 1/16 pel for up to 3 fields/frames
Definition: avcodec.h:1346
void * priv_data
Definition: avcodec.h:1803
int cutoff
Audio cutoff bandwidth (0 means "automatic")
Definition: avcodec.h:2567
int(* update_thread_context)(AVCodecContext *dst, const AVCodecContext *src)
Copy necessary context variables from a previous thread context to the current one.
Definition: avcodec.h:3794
void av_codec_set_seek_preroll(AVCodecContext *avctx, int val)
attribute_deprecated size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)
Put a string representing the codec tag codec_tag in buf.
Definition: utils.c:1314
FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)
Definition: avcodec.h:690
Formatted text, the ass field must be set by the decoder and is authoritative.
Definition: avcodec.h:4088
int64_t frame_offset
Definition: avcodec.h:5170
enum AVCodecID id
Definition: avcodec.h:704
pixel format definitions
int dia_size
ME diamond size & shape.
Definition: avcodec.h:2221
uint8_t * dump_separator
dump format separator.
Definition: avcodec.h:3566
attribute_deprecated int frame_bits
Definition: avcodec.h:2923
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
Definition: avcodec.h:3232
uneven multi-hexagon search
Definition: avcodec.h:812
attribute_deprecated int me_penalty_compensation
Definition: avcodec.h:2415
attribute_deprecated int min_prediction_order
Definition: avcodec.h:2866
as in Berlin toast format
Definition: avcodec.h:574
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
Definition: avcodec.h:3252
int avg_bitrate
Average bitrate of the stream, in bits per second.
Definition: avcodec.h:1369
char * args
Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
Definition: avcodec.h:5898
int channels
number of audio channels
Definition: avcodec.h:2524
int frame_priv_data_size
Size of per-frame hardware accelerator private data.
Definition: avcodec.h:3964
const int * supported_samplerates
array of supported audio samplerates, or NULL if unknown, array is terminated by 0 ...
Definition: avcodec.h:3761
int format
The format of the coded data, corresponds to enum AVPixelFormat for video and for enum AVSampleFormat...
Definition: avcodec.h:5331
unsigned avcodec_version(void)
Return the LIBAVCODEC_VERSION_INT constant.
Definition: utils.c:1557
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:51
char * ass
0 terminated ASS/SSA compatible event line.
Definition: avcodec.h:4123
This side data corresponds to the AVCPBProperties struct.
Definition: avcodec.h:1510
attribute_deprecated int p_count
Definition: avcodec.h:2915
attribute_deprecated int error_rate
Definition: avcodec.h:3405
unsigned av_codec_get_codec_properties(const AVCodecContext *avctx)
Definition: utils.c:578
int mv0_threshold
Note: Value depends upon the compare function used for fullpel ME.
Definition: avcodec.h:2464
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1863
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4194
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:4166
AVDiscard
Definition: avcodec.h:821
attribute_deprecated void av_register_bitstream_filter(AVBitStreamFilter *bsf)
Register a bitstream filter.
int channels
Audio only.
Definition: avcodec.h:4258
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1678
const struct AVBitStreamFilter * filter
Definition: avcodec.h:5891
void avcodec_register(AVCodec *codec)
Register the codec codec and initialize libavcodec.
Definition: utils.c:179
int64_t pts_correction_last_dts
PTS of the last frame.
Definition: avcodec.h:3500
const char * av_packet_side_data_name(enum AVPacketSideDataType type)
Definition: avpacket.c:367
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:2163
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2554
attribute_deprecated void av_free_packet(AVPacket *pkt)
Free a packet.
Definition: avpacket.c:281
int repeat_pict
This field is used for proper frame duration computation in lavf.
Definition: avcodec.h:5185
int64_t pts_correction_num_faulty_pts
Current statistics for PTS correction.
Definition: avcodec.h:3497
enum AVFieldOrder field_order
Field order.
Definition: avcodec.h:2520
int(* receive_packet)(AVCodecContext *avctx, AVPacket *avpkt)
Definition: avcodec.h:3833
AVChromaLocation
Location of chroma samples.
Definition: pixfmt.h:529
int hwaccel_flags
Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated decoding (if active)...
Definition: avcodec.h:3677
enum AVSampleFormat * sample_fmts
array of supported sample formats, or NULL if unknown, array is terminated by -1
Definition: avcodec.h:3762
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:4156
attribute_deprecated int lmin
Definition: avcodec.h:2829
int nb_channels
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:329
int debug_mv
debug
Definition: avcodec.h:3039
int stream_index
Definition: avcodec.h:1681
int(* decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size)
Callback for each slice.
Definition: avcodec.h:3944
const char *const * mime_types
MIME type(s) associated with the codec.
Definition: avcodec.h:725
int(* init)(AVCodecContext *)
Definition: avcodec.h:3807
enum AVSubtitleType type
Definition: avcodec.h:4114
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
Definition: avcodec.h:3668
int(* end_frame)(AVCodecContext *avctx)
Called at the end of each frame or field picture.
Definition: avcodec.h:3955
uint64_t request_channel_layout
Request decoder to use this channel layout if it can (0 for default)
Definition: avcodec.h:2581
int me_pre_cmp
motion estimation prepass comparison function
Definition: avcodec.h:2241
The number of side data elements (in fact a bit more than it).
Definition: avcodec.h:1617
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1656
const char * avcodec_profile_name(enum AVCodecID codec_id, int profile)
Return a name for the specified profile, if available.
Definition: utils.c:1542
AVCodecParameters * par_in
Parameters of the input stream.
Definition: avcodec.h:5942
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, const AVSubtitle *sub)
Definition: encode.c:355
int(* encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)
Encode data to an AVPacket.
Definition: avcodec.h:3820
int key_frame
Set by parser to 1 for key frames and 0 for non-key frames.
Definition: avcodec.h:5216
int delay
Codec delay.
Definition: avcodec.h:1931
int me_subpel_quality
subpel ME quality
Definition: avcodec.h:2255
int strict_std_compliance
strictly follow the standard (MPEG-4, ...).
Definition: avcodec.h:2981
int dts_sync_point
Synchronization point for start of timestamp generation.
Definition: avcodec.h:5236
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1672
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:3467
A dummy ID pointing at the start of subtitle codecs.
Definition: avcodec.h:646
void * opaque
Private data of the user, can be used to carry app specific stuff.
Definition: avcodec.h:1818
int thread_type
Which multithreading methods to use.
Definition: avcodec.h:3202
AVSubtitleType
Definition: avcodec.h:4073
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
Definition: utils.c:535
int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
Finalize list of bitstream filters.
Definition: bsf.c:446
discard nothing
Definition: avcodec.h:824
int64_t rc_max_rate
maximum bitrate
Definition: avcodec.h:2762
const char * name
Definition: opengl_enc.c:103
attribute_deprecated int pre_me
Definition: avcodec.h:2233
This side data should be associated with an audio stream and corresponds to enum AVAudioServiceType.
Definition: avcodec.h:1485
uint8_t * subtitle_header
Header containing style information for text subtitles.
Definition: avcodec.h:3396
int keyint_min
minimum GOP size
Definition: avcodec.h:2435
int(* receive_frame)(AVCodecContext *avctx, AVFrame *frame)
Decode API with decoupled packet/frame dataflow.
Definition: avcodec.h:3840