FFmpeg
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)
100  av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
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  st->codecpar->sample_rate = var_read_int(pb, size);
160  avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
161  } else if (!strcmp(name, "SAMPLE_WIDTH")) {
162  st->codecpar->bits_per_coded_sample = var_read_int(pb, size) * 8;
163  } else
164  return AVERROR_INVALIDDATA;
165 
166  return 0;
167 }
168 
169 /**
170  * Parse video variable
171  * @return < 0 if unknown
172  */
173 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
174  const char *name, int size)
175 {
176  AVIOContext *pb = avctx->pb;
177  if (!strcmp(name, "__DIR_COUNT")) {
178  st->nb_frames = st->duration = var_read_int(pb, size);
179  } else if (!strcmp(name, "COMPRESSION")) {
180  char *str = var_read_string(pb, size);
181  if (!str)
182  return AVERROR_INVALIDDATA;
183  if (!strcmp(str, "1")) {
185  } else if (!strcmp(str, "2")) {
188  } else if (!strcmp(str, "3")) {
190  } else if (!strcmp(str, "10")) {
192  } else if (!strcmp(str, "MVC2")) {
194  } else {
195  avpriv_request_sample(avctx, "Video compression %s", str);
196  }
197  av_free(str);
198  } else if (!strcmp(name, "FPS")) {
199  AVRational fps = var_read_float(pb, size);
200  avpriv_set_pts_info(st, 64, fps.den, fps.num);
201  st->avg_frame_rate = fps;
202  } else if (!strcmp(name, "HEIGHT")) {
203  st->codecpar->height = var_read_int(pb, size);
204  } else if (!strcmp(name, "PIXEL_ASPECT")) {
205  st->sample_aspect_ratio = var_read_float(pb, size);
208  INT_MAX);
209  } else if (!strcmp(name, "WIDTH")) {
210  st->codecpar->width = var_read_int(pb, size);
211  } else if (!strcmp(name, "ORIENTATION")) {
212  if (var_read_int(pb, size) == 1101) {
213  st->codecpar->extradata = av_strdup("BottomUp");
214  if (!st->codecpar->extradata)
215  return AVERROR(ENOMEM);
216  st->codecpar->extradata_size = 9;
217  }
218  } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
219  var_read_metadata(avctx, name, size);
220  } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
221  avio_skip(pb, size); // ignore
222  } else
223  return AVERROR_INVALIDDATA;
224 
225  return 0;
226 }
227 
228 static int read_table(AVFormatContext *avctx, AVStream *st,
229  int (*parse)(AVFormatContext *avctx, AVStream *st,
230  const char *name, int size))
231 {
232  unsigned count;
233  int i;
234 
235  AVIOContext *pb = avctx->pb;
236  avio_skip(pb, 4);
237  count = avio_rb32(pb);
238  avio_skip(pb, 4);
239  for (i = 0; i < count; i++) {
240  char name[17];
241  int size;
242 
243  if (avio_feof(pb))
244  return AVERROR_EOF;
245 
246  avio_read(pb, name, 16);
247  name[sizeof(name) - 1] = 0;
248  size = avio_rb32(pb);
249  if (size < 0) {
250  av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
251  return AVERROR_INVALIDDATA;
252  }
253  if (parse(avctx, st, name, size) < 0) {
254  avpriv_request_sample(avctx, "Variable %s", name);
255  avio_skip(pb, size);
256  }
257  }
258  return 0;
259 }
260 
261 static void read_index(AVIOContext *pb, AVStream *st)
262 {
263  uint64_t timestamp = 0;
264  int i;
265  for (i = 0; i < st->nb_frames; i++) {
266  uint32_t pos = avio_rb32(pb);
267  uint32_t size = avio_rb32(pb);
268  avio_skip(pb, 8);
269  av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
270  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
271  timestamp += size / (st->codecpar->channels * 2);
272  } else {
273  timestamp++;
274  }
275  }
276 }
277 
278 static int mv_read_header(AVFormatContext *avctx)
279 {
280  MvContext *mv = avctx->priv_data;
281  AVIOContext *pb = avctx->pb;
282  AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
283  int version, i;
284  int ret;
285 
286  avio_skip(pb, 4);
287 
288  version = avio_rb16(pb);
289  if (version == 2) {
290  uint64_t timestamp;
291  int v;
292  avio_skip(pb, 22);
293 
294  /* allocate audio track first to prevent unnecessary seeking
295  * (audio packet always precede video packet for a given frame) */
296  ast = avformat_new_stream(avctx, NULL);
297  if (!ast)
298  return AVERROR(ENOMEM);
299 
300  vst = avformat_new_stream(avctx, NULL);
301  if (!vst)
302  return AVERROR(ENOMEM);
303  avpriv_set_pts_info(vst, 64, 1, 15);
304  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
305  vst->avg_frame_rate = av_inv_q(vst->time_base);
306  vst->nb_frames = avio_rb32(pb);
307  v = avio_rb32(pb);
308  switch (v) {
309  case 1:
310  vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
311  break;
312  case 2:
313  vst->codecpar->format = AV_PIX_FMT_ARGB;
314  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
315  break;
316  default:
317  avpriv_request_sample(avctx, "Video compression %i", v);
318  break;
319  }
320  vst->codecpar->codec_tag = 0;
321  vst->codecpar->width = avio_rb32(pb);
322  vst->codecpar->height = avio_rb32(pb);
323  avio_skip(pb, 12);
324 
326  ast->nb_frames = vst->nb_frames;
327  ast->codecpar->sample_rate = avio_rb32(pb);
328  if (ast->codecpar->sample_rate <= 0) {
329  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
330  return AVERROR_INVALIDDATA;
331  }
332  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
333  if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
334  return AVERROR_INVALIDDATA;
335 
336  v = avio_rb32(pb);
337  if (v == AUDIO_FORMAT_SIGNED) {
339  } else {
340  avpriv_request_sample(avctx, "Audio compression (format %i)", v);
341  }
342 
343  avio_skip(pb, 12);
344  var_read_metadata(avctx, "title", 0x80);
345  var_read_metadata(avctx, "comment", 0x100);
346  avio_skip(pb, 0x80);
347 
348  timestamp = 0;
349  for (i = 0; i < vst->nb_frames; i++) {
350  uint32_t pos = avio_rb32(pb);
351  uint32_t asize = avio_rb32(pb);
352  uint32_t vsize = avio_rb32(pb);
353  if (avio_feof(pb))
354  return AVERROR_INVALIDDATA;
355  avio_skip(pb, 8);
356  av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
357  av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
358  timestamp += asize / (ast->codecpar->channels * 2);
359  }
360  } else if (!version && avio_rb16(pb) == 3) {
361  avio_skip(pb, 4);
362 
363  if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
364  return ret;
365 
366  if (mv->nb_audio_tracks > 1) {
367  avpriv_request_sample(avctx, "Multiple audio streams support");
368  return AVERROR_PATCHWELCOME;
369  } else if (mv->nb_audio_tracks) {
370  ast = avformat_new_stream(avctx, NULL);
371  if (!ast)
372  return AVERROR(ENOMEM);
374  if ((read_table(avctx, ast, parse_audio_var)) < 0)
375  return ret;
376  if (mv->acompression == 100 &&
377  mv->aformat == AUDIO_FORMAT_SIGNED &&
378  ast->codecpar->bits_per_coded_sample == 16) {
380  } else {
381  avpriv_request_sample(avctx,
382  "Audio compression %i (format %i, sr %i)",
383  mv->acompression, mv->aformat,
386  }
387  if (ast->codecpar->channels <= 0) {
388  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
389  return AVERROR_INVALIDDATA;
390  }
391  }
392 
393  if (mv->nb_video_tracks > 1) {
394  avpriv_request_sample(avctx, "Multiple video streams support");
395  return AVERROR_PATCHWELCOME;
396  } else if (mv->nb_video_tracks) {
397  vst = avformat_new_stream(avctx, NULL);
398  if (!vst)
399  return AVERROR(ENOMEM);
400  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
401  if ((ret = read_table(avctx, vst, parse_video_var))<0)
402  return ret;
403  }
404 
405  if (mv->nb_audio_tracks)
406  read_index(pb, ast);
407 
408  if (mv->nb_video_tracks)
409  read_index(pb, vst);
410  } else {
411  avpriv_request_sample(avctx, "Version %i", version);
412  return AVERROR_PATCHWELCOME;
413  }
414 
415  return 0;
416 }
417 
419 {
420  MvContext *mv = avctx->priv_data;
421  AVIOContext *pb = avctx->pb;
422  AVStream *st = avctx->streams[mv->stream_index];
423  const AVIndexEntry *index;
424  int frame = mv->frame[mv->stream_index];
425  int64_t ret;
426  uint64_t pos;
427 
428  if (frame < st->nb_index_entries) {
429  index = &st->index_entries[frame];
430  pos = avio_tell(pb);
431  if (index->pos > pos)
432  avio_skip(pb, index->pos - pos);
433  else if (index->pos < pos) {
434  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
435  return AVERROR(EIO);
436  ret = avio_seek(pb, index->pos, SEEK_SET);
437  if (ret < 0)
438  return ret;
439  }
440  ret = av_get_packet(pb, pkt, index->size);
441  if (ret < 0)
442  return ret;
443 
444  pkt->stream_index = mv->stream_index;
445  pkt->pts = index->timestamp;
446  pkt->flags |= AV_PKT_FLAG_KEY;
447 
448  mv->frame[mv->stream_index]++;
449  mv->eof_count = 0;
450  } else {
451  mv->eof_count++;
452  if (mv->eof_count >= avctx->nb_streams)
453  return AVERROR_EOF;
454 
455  // avoid returning 0 without a packet
456  return AVERROR(EAGAIN);
457  }
458 
459  mv->stream_index++;
460  if (mv->stream_index >= avctx->nb_streams)
461  mv->stream_index = 0;
462 
463  return 0;
464 }
465 
467  int64_t timestamp, int flags)
468 {
469  MvContext *mv = avctx->priv_data;
470  AVStream *st = avctx->streams[stream_index];
471  int frame, i;
472 
473  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
474  return AVERROR(ENOSYS);
475 
476  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
477  return AVERROR(EIO);
478 
479  frame = av_index_search_timestamp(st, timestamp, flags);
480  if (frame < 0)
481  return AVERROR_INVALIDDATA;
482 
483  for (i = 0; i < avctx->nb_streams; i++)
484  mv->frame[i] = frame;
485  return 0;
486 }
487 
489  .name = "mv",
490  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
491  .priv_data_size = sizeof(MvContext),
492  .read_probe = mv_probe,
496 };
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int mv_read_header(AVFormatContext *avctx)
Definition: mvdec.c:278
static int parse_video_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse video variable.
Definition: mvdec.c:173
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:2049
static char * var_read_string(AVIOContext *pb, int size)
Definition: mvdec.c:57
int stream_index
current stream index
Definition: mvdec.c:40
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:4926
int64_t pos
Definition: avformat.h:810
#define avpriv_request_sample(...)
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
channels
Definition: aptx.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
int num
Numerator.
Definition: rational.h:59
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1110
static AVRational var_read_float(AVIOContext *pb, int size)
Definition: mvdec.c:85
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
int version
Definition: avisynth_c.h:858
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:788
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mvdec.c:418
Format I/O context.
Definition: avformat.h:1358
static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
Definition: mvdec.c:96
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
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4034
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4499
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:87
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
uint32_t tag
Definition: movenc.c:1531
#define AVERROR_EOF
End of file.
Definition: error.h:55
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
ptrdiff_t size
Definition: opengl_enc.c:100
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
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
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1512
#define AVINDEX_KEYFRAME
Definition: avformat.h:817
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
int eof_count
number of streams that have finished
Definition: mvdec.c:39
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2164
static int mv_read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mvdec.c:466
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:811
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int nb_audio_tracks
Definition: mvdec.c:37
GLsizei count
Definition: opengl_enc.c:108
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1486
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3986
static int read_table(AVFormatContext *avctx, AVStream *st, int(*parse)(AVFormatContext *avctx, AVStream *st, const char *name, int size))
Definition: mvdec.c:228
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:261
int frame[2]
frame nb for current stream
Definition: mvdec.c:41
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
audio channel layout utility functions
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define AUDIO_FORMAT_SIGNED
Definition: mvdec.c:47
static int parse_audio_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse audio variable.
Definition: mvdec.c:143
int nb_video_tracks
Definition: mvdec.c:36
#define s(width, name)
Definition: cbs_vp9.c:257
int acompression
compression level for audio stream
Definition: mvdec.c:43
int n
Definition: avisynth_c.h:760
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
double av_strtod(const char *numstr, char **tail)
Parse the string in numstr and return its value as a double.
Definition: eval.c:106
static const int8_t mv[256][2]
Definition: 4xm.c:77
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
static int mv_probe(const AVProbeData *p)
Definition: mvdec.c:49
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
int index
Definition: gxfenc.c:89
Rational number (pair of numerator and denominator).
Definition: rational.h:58
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2512
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVInputFormat ff_mv_demuxer
Definition: mvdec.c:488
static int var_read_int(AVIOContext *pb, int size)
Definition: mvdec.c:74
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int parse_global_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse global variable.
Definition: mvdec.c:119
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
int sample_rate
Audio only.
Definition: avcodec.h:4078
int aformat
audio format
Definition: mvdec.c:44
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
Main libavformat public API header.
Utilties for rational number calculation.
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:932
int den
Denominator.
Definition: rational.h:60
#define MKBETAG(a, b, c, d)
Definition: common.h:367
#define av_free(p)
void * priv_data
Format private data.
Definition: avformat.h:1386
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2514
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3982
int channels
Audio only.
Definition: avcodec.h:4074
static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
Definition: mvdec.c:103
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:882
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
int stream_index
Definition: avcodec.h:1482
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
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
simple arithmetic expression evaluator
const char * name
Definition: opengl_enc.c:102