FFmpeg
api-seek-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  * Seek 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 
33 int64_t *pts_array;
34 uint32_t *crc_array;
37 
38 static int add_crc_to_array(uint32_t crc, int64_t pts)
39 {
41  if (size_of_array == 0)
42  size_of_array = 10;
43  size_of_array *= 2;
44  crc_array = av_realloc_f(crc_array, size_of_array, sizeof(uint32_t));
45  pts_array = av_realloc_f(pts_array, size_of_array, sizeof(int64_t));
46  if ((crc_array == NULL) || (pts_array == NULL)) {
47  av_log(NULL, AV_LOG_ERROR, "Can't allocate array to store crcs\n");
48  return AVERROR(ENOMEM);
49  }
50  }
54  return 0;
55 }
56 
57 static int compare_crc_in_array(uint32_t crc, int64_t pts)
58 {
59  int i;
60  for (i = 0; i < number_of_elements; i++) {
61  if (pts_array[i] == pts) {
62  if (crc_array[i] == crc) {
63  printf("Comparing 0x%08"PRIx32" %"PRId64" %d is OK\n", crc, pts, i);
64  return 0;
65  }
66  else {
67  av_log(NULL, AV_LOG_ERROR, "Incorrect crc of a frame after seeking\n");
68  return -1;
69  }
70  }
71  }
72  av_log(NULL, AV_LOG_ERROR, "Incorrect pts of a frame after seeking\n");
73  return -1;
74 }
75 
78  uint64_t ts_start, uint64_t ts_end, int no_seeking)
79 {
80  int number_of_written_bytes;
81  int result;
82  int byte_buffer_size;
83  uint8_t *byte_buffer;
84  uint32_t crc;
85 
86  byte_buffer_size = av_image_get_buffer_size(ctx->pix_fmt, ctx->width, ctx->height, 16);
87  byte_buffer = av_malloc(byte_buffer_size);
88  if (!byte_buffer) {
89  av_log(NULL, AV_LOG_ERROR, "Can't allocate buffer\n");
90  return AVERROR(ENOMEM);
91  }
92 
93  if (!no_seeking) {
95  printf("Seeking to %"PRId64", computing crc for frames with pts < %"PRId64"\n", ts_start, ts_end);
96  if (result < 0) {
97  av_log(NULL, AV_LOG_ERROR, "Error in seeking\n");
98  return result;
99  }
101  }
102 
103  do {
105  if (result >= 0 && pkt->stream_index != video_stream) {
107  continue;
108  }
109 
110  if (result < 0)
112  else {
113  if (pkt->pts == AV_NOPTS_VALUE) {
114  av_log(NULL, AV_LOG_ERROR, "Error: frames doesn't have pts values\n");
115  return -1;
116  }
118  }
119 
121 
122  if (result < 0) {
123  av_log(NULL, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
124  return result;
125  }
126 
127  while (result >= 0) {
129  if (result == AVERROR_EOF)
130  goto finish;
131  else if (result == AVERROR(EAGAIN)) {
132  result = 0;
133  break;
134  } else if (result < 0) {
135  av_log(NULL, AV_LOG_ERROR, "Error decoding frame\n");
136  return result;
137  }
138 
139  number_of_written_bytes = av_image_copy_to_buffer(byte_buffer, byte_buffer_size,
140  (const uint8_t* const *)fr->data, (const int*) fr->linesize,
141  ctx->pix_fmt, ctx->width, ctx->height, 1);
142  if (number_of_written_bytes < 0) {
143  av_log(NULL, AV_LOG_ERROR, "Can't copy image to buffer\n");
144  return number_of_written_bytes;
145  }
146  if ((!no_seeking) && (fr->pts > ts_end))
147  break;
148  crc = av_adler32_update(0, (const uint8_t*)byte_buffer, number_of_written_bytes);
149  printf("%10"PRId64", 0x%08"PRIx32"\n", fr->pts, crc);
150  if (no_seeking) {
151  if (add_crc_to_array(crc, fr->pts) < 0)
152  return -1;
153  }
154  else {
155  if (compare_crc_in_array(crc, fr->pts) < 0)
156  return -1;
157  }
158  av_frame_unref(fr);
159  }
160  } while (result >= 0 && (no_seeking || (fr->pts + fr->duration <= ts_end)));
161 
162 finish:
163  av_freep(&byte_buffer);
164 
165  return 0;
166 }
167 
168 static long int read_seek_range(const char *string_with_number)
169 {
170  long int number;
171  char *end_of_string = NULL;
172  number = strtol(string_with_number, &end_of_string, 10);
173  if ((strlen(string_with_number) != end_of_string - string_with_number) || (number < 0)) {
174  av_log(NULL, AV_LOG_ERROR, "Incorrect input ranges of seeking\n");
175  return -1;
176  }
177  else if ((number == LONG_MAX) || (number == LONG_MIN)) {
178  if (errno == ERANGE) {
179  av_log(NULL, AV_LOG_ERROR, "Incorrect input ranges of seeking\n");
180  return -1;
181  }
182  }
183  return number;
184 }
185 
186 static int seek_test(const char *input_filename, const char *start, const char *end)
187 {
188  const AVCodec *codec = NULL;
190  AVCodecParameters *origin_par = NULL;
191  AVPacket *pkt = NULL;
192  AVFrame *fr = NULL;
194  int video_stream;
195  int result;
196  int i, j;
197  long int start_ts, end_ts;
198 
199  size_of_array = 0;
200  number_of_elements = 0;
201  crc_array = NULL;
202  pts_array = NULL;
203 
205  if (result < 0) {
206  av_log(NULL, AV_LOG_ERROR, "Can't open file\n");
207  return result;
208  }
209 
211  if (result < 0) {
212  av_log(NULL, AV_LOG_ERROR, "Can't get stream info\n");
213  goto end;
214  }
215 
216  start_ts = read_seek_range(start);
217  end_ts = read_seek_range(end);
218  if ((start_ts < 0) || (end_ts < 0)) {
219  result = -1;
220  goto end;
221  }
222 
223  //TODO: add ability to work with audio format
225  if (video_stream < 0) {
226  av_log(NULL, AV_LOG_ERROR, "Can't find video stream in input file\n");
228  goto end;
229  }
230 
231  origin_par = fmt_ctx->streams[video_stream]->codecpar;
232 
233  codec = avcodec_find_decoder(origin_par->codec_id);
234  if (!codec) {
235  av_log(NULL, AV_LOG_ERROR, "Can't find decoder\n");
237  goto end;
238  }
239 
240  ctx = avcodec_alloc_context3(codec);
241  if (!ctx) {
242  av_log(NULL, AV_LOG_ERROR, "Can't allocate decoder context\n");
243  result = AVERROR(ENOMEM);
244  goto end;
245  }
246 
248  if (result) {
249  av_log(NULL, AV_LOG_ERROR, "Can't copy decoder context\n");
250  goto end;
251  }
252 
253  result = avcodec_open2(ctx, codec, NULL);
254  if (result < 0) {
255  av_log(ctx, AV_LOG_ERROR, "Can't open decoder\n");
256  goto end;
257  }
258 
259  fr = av_frame_alloc();
260  if (!fr) {
261  av_log(NULL, AV_LOG_ERROR, "Can't allocate frame\n");
262  result = AVERROR(ENOMEM);
263  goto end;
264  }
265 
266  pkt = av_packet_alloc();
267  if (!pkt) {
268  av_log(NULL, AV_LOG_ERROR, "Cannot allocate packet\n");
269  result = AVERROR(ENOMEM);
270  goto end;
271  }
272 
274  if (result != 0)
275  goto end;
276 
277  for (i = start_ts; i < end_ts; i += 100) {
278  for (j = i + 100; j < end_ts; j += 100) {
280  if (result != 0)
281  break;
282  }
283  }
284 
285 end:
289  av_frame_free(&fr);
292  return result;
293 }
294 
295 int main(int argc, char **argv)
296 {
297  if (argc < 4) {
298  av_log(NULL, AV_LOG_ERROR, "Incorrect input\n");
299  return 1;
300  }
301 
302  if (seek_test(argv[1], argv[2], argv[3]) != 0)
303  return 1;
304 
305  return 0;
306 }
number_of_elements
int number_of_elements
Definition: api-seek-test.c:36
compare_crc_in_array
static int compare_crc_in_array(uint32_t crc, int64_t pts)
Definition: api-seek-test.c:57
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: packet.c:427
AVCodec
AVCodec.
Definition: codec.h:187
AVHashContext::crc
uint32_t crc
Definition: hash.c:70
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
AVFrame::duration
int64_t duration
Duration of the frame, in the same units as pts.
Definition: frame.h:780
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
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:486
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
add_crc_to_array
static int add_crc_to_array(uint32_t crc, int64_t pts)
Definition: api-seek-test.c:38
finish
static void finish(void)
Definition: movenc.c:373
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2447
pts
static int64_t pts
Definition: transcode_aac.c:644
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
av_seek_frame
int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Seek to the keyframe at timestamp.
Definition: seek.c:640
read_seek_range
static long int read_seek_range(const char *string_with_number)
Definition: api-seek-test.c:168
crc_array
uint32_t * crc_array
Definition: api-seek-test.c:34
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
size_of_array
int size_of_array
Definition: api-seek-test.c:35
ctx
AVFormatContext * ctx
Definition: movenc.c:49
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
av_realloc_f
#define av_realloc_f(p, o, n)
Definition: tableprint_vlc.h:32
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
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
seek_test
static int seek_test(const char *input_filename, const char *start, const char *end)
Definition: api-seek-test.c:186
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
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
printf
printf("static const uint8_t my_array[100] = {\n")
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
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: packet.c:63
compute_crc_of_packets
static int compute_crc_of_packets(AVFormatContext *fmt_ctx, int video_stream, AVCodecContext *ctx, AVPacket *pkt, AVFrame *fr, uint64_t ts_start, uint64_t ts_end, int no_seeking)
Definition: api-seek-test.c:76
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
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:517
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.h
avcodec_flush_buffers
void avcodec_flush_buffers(AVCodecContext *avctx)
Reset the internal codec state / flush internal buffers.
Definition: avcodec.c:364
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
AVERROR_DECODER_NOT_FOUND
#define AVERROR_DECODER_NOT_FOUND
Decoder not found.
Definition: error.h:54
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
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
main
int main(int argc, char **argv)
Definition: api-seek-test.c:295
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
pts_array
int64_t * pts_array
Seek test.
Definition: api-seek-test.c:33