FFmpeg
api-band-test.c
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1 /*
2  * Copyright (c) 2015 Ludmila Glinskih
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a copy
5  * of this software and associated documentation files (the "Software"), to deal
6  * in the Software without restriction, including without limitation the rights
7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  * copies of the Software, and to permit persons to whom the Software is
9  * furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20  * THE SOFTWARE.
21  */
22 
23 /**
24  * draw_horiz_band test.
25  */
26 
27 #include "libavutil/adler32.h"
28 #include "libavutil/mem.h"
29 #include "libavcodec/avcodec.h"
30 #include "libavformat/avformat.h"
31 #include "libavutil/imgutils.h"
32 
36 
37 static void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4],
38  int slice_position, int type, int height)
39 {
40  int i;
41  const AVPixFmtDescriptor *pix_fmt_desc;
42  int chroma_w, chroma_h;
43  int shift_slice_position;
44  int shift_height;
45 
47 
48  pix_fmt_desc = av_pix_fmt_desc_get(ctx->pix_fmt);
49  chroma_w = -((-ctx->width) >> pix_fmt_desc->log2_chroma_w);
50  chroma_h = -((-height) >> pix_fmt_desc->log2_chroma_h);
51  shift_slice_position = -((-slice_position) >> pix_fmt_desc->log2_chroma_h);
52  shift_height = -((-ctx->height) >> pix_fmt_desc->log2_chroma_h);
53 
54  for (i = 0; i < height; i++) {
55  memcpy(slice_byte_buffer + ctx->width * slice_position + i * ctx->width,
56  fr->data[0] + offset[0] + i * fr->linesize[0], ctx->width);
57  }
58  for (i = 0; i < chroma_h; i++) {
59  memcpy(slice_byte_buffer + ctx->width * ctx->height + chroma_w * shift_slice_position + i * chroma_w,
60  fr->data[1] + offset[1] + i * fr->linesize[1], chroma_w);
61  }
62  for (i = 0; i < chroma_h; i++) {
63  memcpy(slice_byte_buffer + ctx->width * ctx->height + chroma_w * shift_height + chroma_w * shift_slice_position + i * chroma_w,
64  fr->data[2] + offset[2] + i * fr->linesize[2], chroma_w);
65  }
66 }
67 
68 static int video_decode(const char *input_filename)
69 {
70  const AVCodec *codec = NULL;
72  AVCodecParameters *origin_par = NULL;
73  uint8_t *byte_buffer = NULL;
74  AVFrame *fr = NULL;
75  AVPacket *pkt;
77  int number_of_written_bytes;
78  int video_stream;
79  int byte_buffer_size;
80  int result;
81 
83 
85  if (result < 0) {
86  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
87  return result;
88  }
89 
91  if (result < 0) {
92  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
93  return result;
94  }
95 
97  if (video_stream < 0) {
98  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
99  return -1;
100  }
101 
102  origin_par = fmt_ctx->streams[video_stream]->codecpar;
103 
104  codec = avcodec_find_decoder(origin_par->codec_id);
105  if (!codec) {
106  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
107  return -1;
108  }
109 
110  ctx = avcodec_alloc_context3(codec);
111  if (!ctx) {
112  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
113  return AVERROR(ENOMEM);
114  }
115 
117  if (result) {
118  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
119  return result;
120  }
121 
122  ctx->draw_horiz_band = draw_horiz_band;
123  ctx->thread_count = 1;
124 
125  result = avcodec_open2(ctx, codec, NULL);
126  if (result < 0) {
127  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
128  return result;
129  }
130 
131  fr = av_frame_alloc();
132  if (!fr) {
133  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
134  return AVERROR(ENOMEM);
135  }
136 
137  pkt = av_packet_alloc();
138  if (!pkt) {
139  av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
140  return AVERROR(ENOMEM);
141  }
142 
143  if (strcmp(codec->name, "flv") && strcmp(codec->name, "mpeg4") && strcmp(codec->name, "huffyuv")) {
144  av_log(NULL, AV_LOG_ERROR, "Wrong codec\n");
145  return -1;
146  }
147 
148  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 32);
149  byte_buffer = av_malloc(byte_buffer_size);
150  if (!byte_buffer) {
151  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
152  return AVERROR(ENOMEM);
153  }
154 
155  slice_byte_buffer = av_malloc(byte_buffer_size);
156  if (!slice_byte_buffer) {
157  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
158  return AVERROR(ENOMEM);
159  }
160  memset(slice_byte_buffer, 0, byte_buffer_size);
161  slice_byte_buffer_size = byte_buffer_size;
162 
163  result = 0;
164  while (result >= 0) {
166  if (result >= 0 && pkt->stream_index != video_stream) {
168  continue;
169  }
170 
171  // pkt will be empty on read error/EOF
173 
175 
176  if (result < 0) {
177  av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
178  return result;
179  }
180 
181  while (result >= 0) {
183  if (result == AVERROR_EOF)
184  goto finish;
185  else if (result == AVERROR(EAGAIN)) {
186  result = 0;
187  break;
188  } else if (result < 0) {
189  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
190  return result;
191  }
192 
193  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
194  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
195  ctx->pix_fmt, ctx->width, ctx->height, 1);
196  if (number_of_written_bytes < 0) {
197  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
198  return number_of_written_bytes;
199  }
200  if (draw_horiz_band_called == 0) {
201  av_log(NULL, AV_LOG_ERROR, "draw_horiz_band haven't been called!\n");
202  return -1;
203  }
204  if (av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes) !=
205  av_adler32_update(0, (const uint8_t*)slice_byte_buffer, number_of_written_bytes)) {
206  av_log(NULL, AV_LOG_ERROR, "Decoded frames with and without draw_horiz_band are not the same!\n");
207  return -1;
208  }
209  av_frame_unref(fr);
210  }
211  }
212 
213 finish:
215  av_frame_free(&fr);
218  av_freep(&byte_buffer);
220  return 0;
221 }
222 
223 int main(int argc, char **argv)
224 {
225  if (argc < 2)
226  {
227  av_log(NULL, AV_LOG_ERROR, "Incorrect input: expected %s <name of a video file>\nNote that test works only for huffyuv, flv and mpeg4 decoders\n", argv[0]);
228  return 1;
229  }
230 
231  if (video_decode(argv[1]) != 0)
232  return 1;
233 
234  return 0;
235 }
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: packet.c:427
AVCodec
AVCodec.
Definition: codec.h:187
draw_horiz_band
static void draw_horiz_band(AVCodecContext *ctx, const AVFrame *fr, int offset[4], int slice_position, int type, int height)
Definition: api-band-test.c:37
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
av_find_best_stream
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, const AVCodec **decoder_ret, int flags)
Definition: avformat.c:443
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2965
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:160
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1323
av_read_frame
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: demux.c:1538
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: packet.c:74
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:395
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
avformat_close_input
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: demux.c:363
finish
static void finish(void)
Definition: movenc.c:373
video_decode
static int video_decode(const char *input_filename)
Definition: api-band-test.c:68
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:148
pkt
AVPacket * pkt
Definition: movenc.c:60
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
avformat_open_input
int avformat_open_input(AVFormatContext **ps, const char *url, const AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: demux.c:215
avcodec_alloc_context3
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:149
video_stream
static AVStream * video_stream
Definition: demux_decode.c:42
avcodec_receive_frame
int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder or encoder (when the AV_CODEC_FLAG_RECON_FRAME flag is used...
Definition: avcodec.c:698
ctx
AVFormatContext * ctx
Definition: movenc.c:49
AVPixFmtDescriptor::log2_chroma_w
uint8_t log2_chroma_w
Amount to shift the luma width right to find the chroma width.
Definition: pixdesc.h:80
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
avcodec_parameters_to_context
int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
result
and forward the result(frame or status change) to the corresponding input. If nothing is possible
NULL
#define NULL
Definition: coverity.c:32
slice_byte_buffer
uint8_t * slice_byte_buffer
draw_horiz_band test.
Definition: api-band-test.c:33
main
int main(int argc, char **argv)
Definition: api-band-test.c:223
avcodec_free_context
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:164
adler32.h
avcodec_open2
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:142
av_adler32_update
AVAdler av_adler32_update(AVAdler adler, const uint8_t *buf, size_t len)
Calculate the Adler32 checksum of a buffer.
Definition: adler32.c:44
avcodec_find_decoder
const AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:964
avformat_find_stream_info
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: demux.c:2516
fmt_ctx
static AVFormatContext * fmt_ctx
Definition: decode_filter_audio.c:46
height
#define height
av_image_get_buffer_size
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters.
Definition: imgutils.c:466
slice_byte_buffer_size
uint8_t slice_byte_buffer_size
Definition: api-band-test.c:34
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: packet.c:63
avcodec_send_packet
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:696
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
draw_horiz_band_called
int draw_horiz_band_called
Definition: api-band-test.c:35
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:606
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
avcodec.h
avformat.h
AVCodecContext
main external API structure.
Definition: avcodec.h:445
AVPacket::stream_index
int stream_index
Definition: packet.h:526
input_filename
static const char * input_filename
Definition: ffplay.c:306
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:69
av_image_copy_to_buffer
int av_image_copy_to_buffer(uint8_t *dst, int dst_size, const uint8_t *const src_data[4], const int src_linesize[4], enum AVPixelFormat pix_fmt, int width, int height, int align)
Copy image data from an image into a buffer.
Definition: imgutils.c:501
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:501
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:419
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVPixFmtDescriptor::log2_chroma_h
uint8_t log2_chroma_h
Amount to shift the luma height right to find the chroma height.
Definition: pixdesc.h:89