FFmpeg  4.4
mvdec.c
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1 /*
2  * Silicon Graphics Movie demuxer
3  * Copyright (c) 2012 Peter Ross
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Silicon Graphics Movie demuxer
25  */
26 
28 #include "libavutil/eval.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/rational.h"
31 
32 #include "avformat.h"
33 #include "internal.h"
34 
35 typedef struct MvContext {
38 
39  int eof_count; ///< number of streams that have finished
40  int stream_index; ///< current stream index
41  int frame[2]; ///< frame nb for current stream
42 
43  int acompression; ///< compression level for audio stream
44  int aformat; ///< audio format
45 } MvContext;
46 
47 #define AUDIO_FORMAT_SIGNED 401
48 
49 static int mv_probe(const AVProbeData *p)
50 {
51  if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
52  AV_RB16(p->buf + 4) < 3)
53  return AVPROBE_SCORE_MAX;
54  return 0;
55 }
56 
57 static char *var_read_string(AVIOContext *pb, int size)
58 {
59  int n;
60  char *str;
61 
62  if (size < 0 || size == INT_MAX)
63  return NULL;
64 
65  str = av_malloc(size + 1);
66  if (!str)
67  return NULL;
68  n = avio_get_str(pb, size, str, size + 1);
69  if (n < size)
70  avio_skip(pb, size - n);
71  return str;
72 }
73 
74 static int var_read_int(AVIOContext *pb, int size)
75 {
76  int v;
77  char *s = var_read_string(pb, size);
78  if (!s)
79  return 0;
80  v = strtol(s, NULL, 10);
81  av_free(s);
82  return v;
83 }
84 
86 {
87  AVRational v;
88  char *s = var_read_string(pb, size);
89  if (!s)
90  return (AVRational) { 0, 0 };
91  v = av_d2q(av_strtod(s, NULL), INT_MAX);
92  av_free(s);
93  return v;
94 }
95 
96 static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
97 {
98  char *value = var_read_string(avctx->pb, size);
99  if (value)
101 }
102 
103 static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
104 {
105  if (channels <= 0) {
106  av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
107  return AVERROR_INVALIDDATA;
108  }
109  st->codecpar->channels = channels;
112  return 0;
113 }
114 
115 /**
116  * Parse global variable
117  * @return < 0 if unknown
118  */
120  const char *name, int size)
121 {
122  MvContext *mv = avctx->priv_data;
123  AVIOContext *pb = avctx->pb;
124  if (!strcmp(name, "__NUM_I_TRACKS")) {
125  mv->nb_video_tracks = var_read_int(pb, size);
126  } else if (!strcmp(name, "__NUM_A_TRACKS")) {
127  mv->nb_audio_tracks = var_read_int(pb, size);
128  } else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
129  var_read_metadata(avctx, name, size);
130  } else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") ||
131  !strcmp(name, "OPTIMIZED")) {
132  avio_skip(pb, size); // ignore
133  } else
134  return AVERROR_INVALIDDATA;
135 
136  return 0;
137 }
138 
139 /**
140  * Parse audio variable
141  * @return < 0 if unknown
142  */
143 static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
144  const char *name, int size)
145 {
146  MvContext *mv = avctx->priv_data;
147  AVIOContext *pb = avctx->pb;
148  if (!strcmp(name, "__DIR_COUNT")) {
149  st->nb_frames = var_read_int(pb, size);
150  } else if (!strcmp(name, "AUDIO_FORMAT")) {
151  mv->aformat = var_read_int(pb, size);
152  } else if (!strcmp(name, "COMPRESSION")) {
153  mv->acompression = var_read_int(pb, size);
154  } else if (!strcmp(name, "DEFAULT_VOL")) {
155  var_read_metadata(avctx, name, size);
156  } else if (!strcmp(name, "NUM_CHANNELS")) {
157  return set_channels(avctx, st, var_read_int(pb, size));
158  } else if (!strcmp(name, "SAMPLE_RATE")) {
160  avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
161  } else if (!strcmp(name, "SAMPLE_WIDTH")) {
162  uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
163  if (bpc > 16)
164  return AVERROR_INVALIDDATA;
165  st->codecpar->bits_per_coded_sample = bpc;
166  } else
167  return AVERROR_INVALIDDATA;
168 
169  return 0;
170 }
171 
172 /**
173  * Parse video variable
174  * @return < 0 if unknown
175  */
176 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
177  const char *name, int size)
178 {
179  AVIOContext *pb = avctx->pb;
180  if (!strcmp(name, "__DIR_COUNT")) {
181  st->nb_frames = st->duration = var_read_int(pb, size);
182  } else if (!strcmp(name, "COMPRESSION")) {
183  char *str = var_read_string(pb, size);
184  if (!str)
185  return AVERROR_INVALIDDATA;
186  if (!strcmp(str, "1")) {
188  } else if (!strcmp(str, "2")) {
191  } else if (!strcmp(str, "3")) {
193  } else if (!strcmp(str, "10")) {
195  } else if (!strcmp(str, "MVC2")) {
197  } else {
198  avpriv_request_sample(avctx, "Video compression %s", str);
199  }
200  av_free(str);
201  } else if (!strcmp(name, "FPS")) {
202  AVRational fps = var_read_float(pb, size);
203  avpriv_set_pts_info(st, 64, fps.den, fps.num);
204  st->avg_frame_rate = fps;
205  } else if (!strcmp(name, "HEIGHT")) {
206  st->codecpar->height = var_read_int(pb, size);
207  } else if (!strcmp(name, "PIXEL_ASPECT")) {
211  INT_MAX);
212  } else if (!strcmp(name, "WIDTH")) {
213  st->codecpar->width = var_read_int(pb, size);
214  } else if (!strcmp(name, "ORIENTATION")) {
215  if (var_read_int(pb, size) == 1101) {
216  if (!st->codecpar->extradata) {
217  st->codecpar->extradata = av_strdup("BottomUp");
218  if (!st->codecpar->extradata)
219  return AVERROR(ENOMEM);
220  st->codecpar->extradata_size = 9;
221  }
222  }
223  } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
224  var_read_metadata(avctx, name, size);
225  } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
226  avio_skip(pb, size); // ignore
227  } else
228  return AVERROR_INVALIDDATA;
229 
230  return 0;
231 }
232 
233 static int read_table(AVFormatContext *avctx, AVStream *st,
234  int (*parse)(AVFormatContext *avctx, AVStream *st,
235  const char *name, int size))
236 {
237  unsigned count;
238  int i;
239 
240  AVIOContext *pb = avctx->pb;
241  avio_skip(pb, 4);
242  count = avio_rb32(pb);
243  avio_skip(pb, 4);
244  for (i = 0; i < count; i++) {
245  char name[17];
246  int size;
247 
248  if (avio_feof(pb))
249  return AVERROR_EOF;
250 
251  avio_read(pb, name, 16);
252  name[sizeof(name) - 1] = 0;
253  size = avio_rb32(pb);
254  if (size < 0) {
255  av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
256  return AVERROR_INVALIDDATA;
257  }
258  if (parse(avctx, st, name, size) < 0) {
259  avpriv_request_sample(avctx, "Variable %s", name);
260  avio_skip(pb, size);
261  }
262  }
263  return 0;
264 }
265 
266 static void read_index(AVIOContext *pb, AVStream *st)
267 {
268  uint64_t timestamp = 0;
269  int i;
270  for (i = 0; i < st->nb_frames; i++) {
271  uint32_t pos = avio_rb32(pb);
272  uint32_t size = avio_rb32(pb);
273  avio_skip(pb, 8);
274  if (avio_feof(pb))
275  return ;
276  av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
277  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
278  timestamp += size / (st->codecpar->channels * 2LL);
279  } else {
280  timestamp++;
281  }
282  }
283 }
284 
285 static int mv_read_header(AVFormatContext *avctx)
286 {
287  MvContext *mv = avctx->priv_data;
288  AVIOContext *pb = avctx->pb;
289  AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
290  int version, i;
291  int ret;
292 
293  avio_skip(pb, 4);
294 
295  version = avio_rb16(pb);
296  if (version == 2) {
297  uint64_t timestamp;
298  int v;
299  avio_skip(pb, 22);
300 
301  /* allocate audio track first to prevent unnecessary seeking
302  * (audio packet always precede video packet for a given frame) */
303  ast = avformat_new_stream(avctx, NULL);
304  if (!ast)
305  return AVERROR(ENOMEM);
306 
307  vst = avformat_new_stream(avctx, NULL);
308  if (!vst)
309  return AVERROR(ENOMEM);
310  avpriv_set_pts_info(vst, 64, 1, 15);
311  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
312  vst->avg_frame_rate = av_inv_q(vst->time_base);
313  vst->nb_frames = avio_rb32(pb);
314  v = avio_rb32(pb);
315  switch (v) {
316  case 1:
317  vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
318  break;
319  case 2:
320  vst->codecpar->format = AV_PIX_FMT_ARGB;
321  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
322  break;
323  default:
324  avpriv_request_sample(avctx, "Video compression %i", v);
325  break;
326  }
327  vst->codecpar->codec_tag = 0;
328  vst->codecpar->width = avio_rb32(pb);
329  vst->codecpar->height = avio_rb32(pb);
330  avio_skip(pb, 12);
331 
333  ast->nb_frames = vst->nb_frames;
334  ast->codecpar->sample_rate = avio_rb32(pb);
335  if (ast->codecpar->sample_rate <= 0) {
336  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
337  return AVERROR_INVALIDDATA;
338  }
339  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
340  if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
341  return AVERROR_INVALIDDATA;
342 
343  v = avio_rb32(pb);
344  if (v == AUDIO_FORMAT_SIGNED) {
346  } else {
347  avpriv_request_sample(avctx, "Audio compression (format %i)", v);
348  }
349 
350  avio_skip(pb, 12);
351  var_read_metadata(avctx, "title", 0x80);
352  var_read_metadata(avctx, "comment", 0x100);
353  avio_skip(pb, 0x80);
354 
355  timestamp = 0;
356  for (i = 0; i < vst->nb_frames; i++) {
357  uint32_t pos = avio_rb32(pb);
358  uint32_t asize = avio_rb32(pb);
359  uint32_t vsize = avio_rb32(pb);
360  if (avio_feof(pb))
361  return AVERROR_INVALIDDATA;
362  avio_skip(pb, 8);
363  av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
364  av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
365  timestamp += asize / (ast->codecpar->channels * 2LL);
366  }
367  } else if (!version && avio_rb16(pb) == 3) {
368  avio_skip(pb, 4);
369 
370  if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
371  return ret;
372 
373  if (mv->nb_audio_tracks < 0 || mv->nb_video_tracks < 0 ||
374  (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
375  av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
376  return AVERROR_INVALIDDATA;
377  }
378 
379  if (mv->nb_audio_tracks > 1) {
380  avpriv_request_sample(avctx, "Multiple audio streams support");
381  return AVERROR_PATCHWELCOME;
382  } else if (mv->nb_audio_tracks) {
383  ast = avformat_new_stream(avctx, NULL);
384  if (!ast)
385  return AVERROR(ENOMEM);
387  if ((read_table(avctx, ast, parse_audio_var)) < 0)
388  return ret;
389  if (mv->acompression == 100 &&
390  mv->aformat == AUDIO_FORMAT_SIGNED &&
391  ast->codecpar->bits_per_coded_sample == 16) {
393  } else {
394  avpriv_request_sample(avctx,
395  "Audio compression %i (format %i, sr %i)",
396  mv->acompression, mv->aformat,
399  }
400  if (ast->codecpar->channels <= 0) {
401  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
402  return AVERROR_INVALIDDATA;
403  }
404  }
405 
406  if (mv->nb_video_tracks > 1) {
407  avpriv_request_sample(avctx, "Multiple video streams support");
408  return AVERROR_PATCHWELCOME;
409  } else if (mv->nb_video_tracks) {
410  vst = avformat_new_stream(avctx, NULL);
411  if (!vst)
412  return AVERROR(ENOMEM);
413  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
414  if ((ret = read_table(avctx, vst, parse_video_var))<0)
415  return ret;
416  }
417 
418  if (mv->nb_audio_tracks)
419  read_index(pb, ast);
420 
421  if (mv->nb_video_tracks)
422  read_index(pb, vst);
423  } else {
424  avpriv_request_sample(avctx, "Version %i", version);
425  return AVERROR_PATCHWELCOME;
426  }
427 
428  return 0;
429 }
430 
432 {
433  MvContext *mv = avctx->priv_data;
434  AVIOContext *pb = avctx->pb;
435  AVStream *st = avctx->streams[mv->stream_index];
436  const AVIndexEntry *index;
437  int frame = mv->frame[mv->stream_index];
438  int64_t ret;
439  uint64_t pos;
440 
441  if (frame < st->nb_index_entries) {
442  index = &st->index_entries[frame];
443  pos = avio_tell(pb);
444  if (index->pos > pos)
445  avio_skip(pb, index->pos - pos);
446  else if (index->pos < pos) {
447  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
448  return AVERROR(EIO);
449  ret = avio_seek(pb, index->pos, SEEK_SET);
450  if (ret < 0)
451  return ret;
452  }
453  ret = av_get_packet(pb, pkt, index->size);
454  if (ret < 0)
455  return ret;
456 
457  pkt->stream_index = mv->stream_index;
458  pkt->pts = index->timestamp;
460 
461  mv->frame[mv->stream_index]++;
462  mv->eof_count = 0;
463  } else {
464  mv->eof_count++;
465  if (mv->eof_count >= avctx->nb_streams)
466  return AVERROR_EOF;
467 
468  // avoid returning 0 without a packet
469  return AVERROR(EAGAIN);
470  }
471 
472  mv->stream_index++;
473  if (mv->stream_index >= avctx->nb_streams)
474  mv->stream_index = 0;
475 
476  return 0;
477 }
478 
479 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
480  int64_t timestamp, int flags)
481 {
482  MvContext *mv = avctx->priv_data;
483  AVStream *st = avctx->streams[stream_index];
484  int frame, i;
485 
487  return AVERROR(ENOSYS);
488 
489  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
490  return AVERROR(EIO);
491 
492  frame = av_index_search_timestamp(st, timestamp, flags);
493  if (frame < 0)
494  return AVERROR_INVALIDDATA;
495 
496  for (i = 0; i < avctx->nb_streams; i++)
497  mv->frame[i] = frame;
498  return 0;
499 }
500 
502  .name = "mv",
503  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
504  .priv_data_size = sizeof(MvContext),
505  .read_probe = mv_probe,
509 };
channels
Definition: aptx.h:33
return
Main libavformat public API header.
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2416
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2418
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:766
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:860
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:781
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RB16
Definition: intreadwrite.h:53
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define s(width, name)
Definition: cbs_vp9.c:257
audio channel layout utility functions
#define MKBETAG(a, b, c, d)
Definition: common.h:479
#define NULL
Definition: coverity.c:32
static AVFrame * frame
double av_strtod(const char *numstr, char **tail)
Parse the string in numstr and return its value as a double.
Definition: eval.c:106
double value
Definition: eval.c:98
simple arithmetic expression evaluator
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
#define AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_STEREO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:314
@ AV_CODEC_ID_SGIRLE
Definition: codec_id.h:232
@ AV_CODEC_ID_MVC1
Definition: codec_id.h:233
@ AV_CODEC_ID_MVC2
Definition: codec_id.h:234
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:56
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4505
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:2011
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2128
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that's been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:74
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max)
Reduce a fraction.
Definition: rational.c:35
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int index
Definition: gxfenc.c:89
int i
Definition: input.c:407
static const int8_t mv[256][2]
Definition: 4xm.c:78
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4941
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
version
Definition: libkvazaar.c:320
uint32_t tag
Definition: movenc.c:1600
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:266
AVInputFormat ff_mv_demuxer
Definition: mvdec.c:501
static char * var_read_string(AVIOContext *pb, int size)
Definition: mvdec.c:57
static int parse_audio_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse audio variable.
Definition: mvdec.c:143
static int mv_read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mvdec.c:479
static int read_table(AVFormatContext *avctx, AVStream *st, int(*parse)(AVFormatContext *avctx, AVStream *st, const char *name, int size))
Definition: mvdec.c:233
static int var_read_int(AVIOContext *pb, int size)
Definition: mvdec.c:74
static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
Definition: mvdec.c:103
static AVRational var_read_float(AVIOContext *pb, int size)
Definition: mvdec.c:85
static int parse_video_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse video variable.
Definition: mvdec.c:176
static int parse_global_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse global variable.
Definition: mvdec.c:119
static int mv_read_header(AVFormatContext *avctx)
Definition: mvdec.c:285
#define AUDIO_FORMAT_SIGNED
Definition: mvdec.c:47
static int mv_probe(const AVProbeData *p)
Definition: mvdec.c:49
static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
Definition: mvdec.c:96
static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mvdec.c:431
@ AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
@ AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
const char * name
Definition: qsvenc.c:46
Utilties for rational number calculation.
unsigned int pos
Definition: spdifenc.c:412
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
int channels
Audio only.
Definition: codec_par.h:166
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1288
AVIOContext * pb
I/O context.
Definition: avformat.h:1274
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1474
void * priv_data
Format private data.
Definition: avformat.h:1260
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1300
Bytestream IO Context.
Definition: avio.h:161
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Rational number (pair of numerator and denominator).
Definition: rational.h:58
int num
Numerator.
Definition: rational.h:59
int den
Denominator.
Definition: rational.h:60
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:935
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:946
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
int eof_count
number of streams that have finished
Definition: mvdec.c:39
int aformat
audio format
Definition: mvdec.c:44
int nb_video_tracks
Definition: mvdec.c:36
int frame[2]
frame nb for current stream
Definition: mvdec.c:41
int stream_index
current stream index
Definition: mvdec.c:40
int acompression
compression level for audio stream
Definition: mvdec.c:43
int nb_audio_tracks
Definition: mvdec.c:37
#define av_free(p)
#define avpriv_request_sample(...)
#define av_malloc(s)
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
int size
static int parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size)
Definition: vp3_parser.c:23