FFmpeg  4.4.6
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")) {
159  int sample_rate = var_read_int(pb, size);
160  if (sample_rate <= 0)
161  return AVERROR_INVALIDDATA;
163  avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
164  } else if (!strcmp(name, "SAMPLE_WIDTH")) {
165  uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
166  if (bpc > 16)
167  return AVERROR_INVALIDDATA;
168  st->codecpar->bits_per_coded_sample = bpc;
169  } else
170  return AVERROR_INVALIDDATA;
171 
172  return 0;
173 }
174 
175 /**
176  * Parse video variable
177  * @return < 0 if unknown
178  */
179 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
180  const char *name, int size)
181 {
182  AVIOContext *pb = avctx->pb;
183  if (!strcmp(name, "__DIR_COUNT")) {
184  st->nb_frames = st->duration = var_read_int(pb, size);
185  } else if (!strcmp(name, "COMPRESSION")) {
186  char *str = var_read_string(pb, size);
187  if (!str)
188  return AVERROR_INVALIDDATA;
189  if (!strcmp(str, "1")) {
191  } else if (!strcmp(str, "2")) {
194  } else if (!strcmp(str, "3")) {
196  } else if (!strcmp(str, "10")) {
198  } else if (!strcmp(str, "MVC2")) {
200  } else {
201  avpriv_request_sample(avctx, "Video compression %s", str);
202  }
203  av_free(str);
204  } else if (!strcmp(name, "FPS")) {
205  AVRational fps = var_read_float(pb, size);
206  avpriv_set_pts_info(st, 64, fps.den, fps.num);
207  st->avg_frame_rate = fps;
208  } else if (!strcmp(name, "HEIGHT")) {
209  st->codecpar->height = var_read_int(pb, size);
210  } else if (!strcmp(name, "PIXEL_ASPECT")) {
214  INT_MAX);
215  } else if (!strcmp(name, "WIDTH")) {
216  st->codecpar->width = var_read_int(pb, size);
217  } else if (!strcmp(name, "ORIENTATION")) {
218  if (var_read_int(pb, size) == 1101) {
219  if (!st->codecpar->extradata) {
220  st->codecpar->extradata = av_strdup("BottomUp");
221  if (!st->codecpar->extradata)
222  return AVERROR(ENOMEM);
223  st->codecpar->extradata_size = 9;
224  }
225  }
226  } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
227  var_read_metadata(avctx, name, size);
228  } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
229  avio_skip(pb, size); // ignore
230  } else
231  return AVERROR_INVALIDDATA;
232 
233  return 0;
234 }
235 
236 static int read_table(AVFormatContext *avctx, AVStream *st,
237  int (*parse)(AVFormatContext *avctx, AVStream *st,
238  const char *name, int size))
239 {
240  unsigned count;
241  int i;
242 
243  AVIOContext *pb = avctx->pb;
244  avio_skip(pb, 4);
245  count = avio_rb32(pb);
246  avio_skip(pb, 4);
247  for (i = 0; i < count; i++) {
248  char name[17];
249  int size;
250 
251  if (avio_feof(pb))
252  return AVERROR_EOF;
253 
254  if (avio_read(pb, name, 16) != 16)
255  return AVERROR_INVALIDDATA;
256  name[sizeof(name) - 1] = 0;
257  size = avio_rb32(pb);
258  if (size < 0) {
259  av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
260  return AVERROR_INVALIDDATA;
261  }
262  if (parse(avctx, st, name, size) < 0) {
263  avpriv_request_sample(avctx, "Variable %s", name);
264  avio_skip(pb, size);
265  }
266  }
267  return 0;
268 }
269 
270 static void read_index(AVIOContext *pb, AVStream *st)
271 {
272  uint64_t timestamp = 0;
273  int i;
274  for (i = 0; i < st->nb_frames; i++) {
275  uint32_t pos = avio_rb32(pb);
276  uint32_t size = avio_rb32(pb);
277  avio_skip(pb, 8);
278  if (avio_feof(pb))
279  return ;
280  av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
281  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
282  timestamp += size / (st->codecpar->channels * 2LL);
283  } else {
284  timestamp++;
285  }
286  }
287 }
288 
289 static int mv_read_header(AVFormatContext *avctx)
290 {
291  MvContext *mv = avctx->priv_data;
292  AVIOContext *pb = avctx->pb;
293  AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
294  int version, i;
295  int ret;
296 
297  avio_skip(pb, 4);
298 
299  version = avio_rb16(pb);
300  if (version == 2) {
301  uint64_t timestamp;
302  int v;
303  avio_skip(pb, 22);
304 
305  /* allocate audio track first to prevent unnecessary seeking
306  * (audio packet always precede video packet for a given frame) */
307  ast = avformat_new_stream(avctx, NULL);
308  if (!ast)
309  return AVERROR(ENOMEM);
310 
311  vst = avformat_new_stream(avctx, NULL);
312  if (!vst)
313  return AVERROR(ENOMEM);
314  avpriv_set_pts_info(vst, 64, 1, 15);
315  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
316  vst->avg_frame_rate = av_inv_q(vst->time_base);
317  vst->nb_frames = avio_rb32(pb);
318  v = avio_rb32(pb);
319  switch (v) {
320  case 1:
321  vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
322  break;
323  case 2:
324  vst->codecpar->format = AV_PIX_FMT_ARGB;
325  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
326  break;
327  default:
328  avpriv_request_sample(avctx, "Video compression %i", v);
329  break;
330  }
331  vst->codecpar->codec_tag = 0;
332  vst->codecpar->width = avio_rb32(pb);
333  vst->codecpar->height = avio_rb32(pb);
334  avio_skip(pb, 12);
335 
337  ast->nb_frames = vst->nb_frames;
338  ast->codecpar->sample_rate = avio_rb32(pb);
339  if (ast->codecpar->sample_rate <= 0) {
340  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
341  return AVERROR_INVALIDDATA;
342  }
343  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
344  if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
345  return AVERROR_INVALIDDATA;
346 
347  v = avio_rb32(pb);
348  if (v == AUDIO_FORMAT_SIGNED) {
350  } else {
351  avpriv_request_sample(avctx, "Audio compression (format %i)", v);
352  }
353 
354  avio_skip(pb, 12);
355  var_read_metadata(avctx, "title", 0x80);
356  var_read_metadata(avctx, "comment", 0x100);
357  avio_skip(pb, 0x80);
358 
359  timestamp = 0;
360  for (i = 0; i < vst->nb_frames; i++) {
361  uint32_t pos = avio_rb32(pb);
362  uint32_t asize = avio_rb32(pb);
363  uint32_t vsize = avio_rb32(pb);
364  if (avio_feof(pb))
365  return AVERROR_INVALIDDATA;
366  avio_skip(pb, 8);
367  av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
368  av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
369  timestamp += asize / (ast->codecpar->channels * 2LL);
370  }
371  } else if (!version && avio_rb16(pb) == 3) {
372  avio_skip(pb, 4);
373 
374  if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
375  return ret;
376 
377  if (mv->nb_audio_tracks < 0 || mv->nb_video_tracks < 0 ||
378  (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
379  av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
380  return AVERROR_INVALIDDATA;
381  }
382 
383  if (mv->nb_audio_tracks > 1) {
384  avpriv_request_sample(avctx, "Multiple audio streams support");
385  return AVERROR_PATCHWELCOME;
386  } else if (mv->nb_audio_tracks) {
387  ast = avformat_new_stream(avctx, NULL);
388  if (!ast)
389  return AVERROR(ENOMEM);
391  if ((read_table(avctx, ast, parse_audio_var)) < 0)
392  return ret;
393  if (mv->acompression == 100 &&
394  mv->aformat == AUDIO_FORMAT_SIGNED &&
395  ast->codecpar->bits_per_coded_sample == 16) {
397  } else {
398  avpriv_request_sample(avctx,
399  "Audio compression %i (format %i, sr %i)",
400  mv->acompression, mv->aformat,
403  }
404  if (ast->codecpar->channels <= 0) {
405  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
406  return AVERROR_INVALIDDATA;
407  }
408  }
409 
410  if (mv->nb_video_tracks > 1) {
411  avpriv_request_sample(avctx, "Multiple video streams support");
412  return AVERROR_PATCHWELCOME;
413  } else if (mv->nb_video_tracks) {
414  vst = avformat_new_stream(avctx, NULL);
415  if (!vst)
416  return AVERROR(ENOMEM);
417  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
418  if ((ret = read_table(avctx, vst, parse_video_var))<0)
419  return ret;
420  }
421 
422  if (mv->nb_audio_tracks)
423  read_index(pb, ast);
424 
425  if (mv->nb_video_tracks)
426  read_index(pb, vst);
427  } else {
428  avpriv_request_sample(avctx, "Version %i", version);
429  return AVERROR_PATCHWELCOME;
430  }
431 
432  return 0;
433 }
434 
436 {
437  MvContext *mv = avctx->priv_data;
438  AVIOContext *pb = avctx->pb;
439  AVStream *st = avctx->streams[mv->stream_index];
440  const AVIndexEntry *index;
441  int frame = mv->frame[mv->stream_index];
442  int64_t ret;
443  uint64_t pos;
444 
445  if (frame < st->nb_index_entries) {
446  index = &st->index_entries[frame];
447  pos = avio_tell(pb);
448  if (index->pos > pos)
449  avio_skip(pb, index->pos - pos);
450  else if (index->pos < pos) {
451  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
452  return AVERROR(EIO);
453  ret = avio_seek(pb, index->pos, SEEK_SET);
454  if (ret < 0)
455  return ret;
456  }
457  ret = av_get_packet(pb, pkt, index->size);
458  if (ret < 0)
459  return ret;
460 
461  pkt->stream_index = mv->stream_index;
462  pkt->pts = index->timestamp;
464 
465  mv->frame[mv->stream_index]++;
466  mv->eof_count = 0;
467  } else {
468  mv->eof_count++;
469  if (mv->eof_count >= avctx->nb_streams)
470  return AVERROR_EOF;
471 
472  // avoid returning 0 without a packet
473  return AVERROR(EAGAIN);
474  }
475 
476  mv->stream_index++;
477  if (mv->stream_index >= avctx->nb_streams)
478  mv->stream_index = 0;
479 
480  return 0;
481 }
482 
483 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
484  int64_t timestamp, int flags)
485 {
486  MvContext *mv = avctx->priv_data;
487  AVStream *st = avctx->streams[stream_index];
488  int frame, i;
489 
491  return AVERROR(ENOSYS);
492 
493  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
494  return AVERROR(EIO);
495 
496  frame = av_index_search_timestamp(st, timestamp, flags);
497  if (frame < 0)
498  return AVERROR_INVALIDDATA;
499 
500  for (i = 0; i < avctx->nb_streams; i++)
501  mv->frame[i] = frame;
502  return 0;
503 }
504 
506  .name = "mv",
507  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
508  .priv_data_size = sizeof(MvContext),
509  .read_probe = mv_probe,
513 };
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:572
#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
long long int64_t
Definition: coverity.c:34
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
sample_rate
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:545
#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:4509
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:2013
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2130
#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:4945
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:326
uint32_t tag
Definition: movenc.c:1611
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:270
AVInputFormat ff_mv_demuxer
Definition: mvdec.c:505
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:483
static int read_table(AVFormatContext *avctx, AVStream *st, int(*parse)(AVFormatContext *avctx, AVStream *st, const char *name, int size))
Definition: mvdec.c:236
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:179
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:289
#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:435
@ 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