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  st->codecpar->extradata_size = 9;
215  }
216  } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
217  var_read_metadata(avctx, name, size);
218  } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
219  avio_skip(pb, size); // ignore
220  } else
221  return AVERROR_INVALIDDATA;
222 
223  return 0;
224 }
225 
226 static int read_table(AVFormatContext *avctx, AVStream *st,
227  int (*parse)(AVFormatContext *avctx, AVStream *st,
228  const char *name, int size))
229 {
230  unsigned count;
231  int i;
232 
233  AVIOContext *pb = avctx->pb;
234  avio_skip(pb, 4);
235  count = avio_rb32(pb);
236  avio_skip(pb, 4);
237  for (i = 0; i < count; i++) {
238  char name[17];
239  int size;
240 
241  if (avio_feof(pb))
242  return AVERROR_EOF;
243 
244  avio_read(pb, name, 16);
245  name[sizeof(name) - 1] = 0;
246  size = avio_rb32(pb);
247  if (size < 0) {
248  av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
249  return AVERROR_INVALIDDATA;
250  }
251  if (parse(avctx, st, name, size) < 0) {
252  avpriv_request_sample(avctx, "Variable %s", name);
253  avio_skip(pb, size);
254  }
255  }
256  return 0;
257 }
258 
259 static void read_index(AVIOContext *pb, AVStream *st)
260 {
261  uint64_t timestamp = 0;
262  int i;
263  for (i = 0; i < st->nb_frames; i++) {
264  uint32_t pos = avio_rb32(pb);
265  uint32_t size = avio_rb32(pb);
266  avio_skip(pb, 8);
267  av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
268  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
269  timestamp += size / (st->codecpar->channels * 2);
270  } else {
271  timestamp++;
272  }
273  }
274 }
275 
276 static int mv_read_header(AVFormatContext *avctx)
277 {
278  MvContext *mv = avctx->priv_data;
279  AVIOContext *pb = avctx->pb;
280  AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
281  int version, i;
282  int ret;
283 
284  avio_skip(pb, 4);
285 
286  version = avio_rb16(pb);
287  if (version == 2) {
288  uint64_t timestamp;
289  int v;
290  avio_skip(pb, 22);
291 
292  /* allocate audio track first to prevent unnecessary seeking
293  * (audio packet always precede video packet for a given frame) */
294  ast = avformat_new_stream(avctx, NULL);
295  if (!ast)
296  return AVERROR(ENOMEM);
297 
298  vst = avformat_new_stream(avctx, NULL);
299  if (!vst)
300  return AVERROR(ENOMEM);
301  avpriv_set_pts_info(vst, 64, 1, 15);
302  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
303  vst->avg_frame_rate = av_inv_q(vst->time_base);
304  vst->nb_frames = avio_rb32(pb);
305  v = avio_rb32(pb);
306  switch (v) {
307  case 1:
308  vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
309  break;
310  case 2:
311  vst->codecpar->format = AV_PIX_FMT_ARGB;
312  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
313  break;
314  default:
315  avpriv_request_sample(avctx, "Video compression %i", v);
316  break;
317  }
318  vst->codecpar->codec_tag = 0;
319  vst->codecpar->width = avio_rb32(pb);
320  vst->codecpar->height = avio_rb32(pb);
321  avio_skip(pb, 12);
322 
324  ast->nb_frames = vst->nb_frames;
325  ast->codecpar->sample_rate = avio_rb32(pb);
326  if (ast->codecpar->sample_rate <= 0) {
327  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
328  return AVERROR_INVALIDDATA;
329  }
330  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
331  if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
332  return AVERROR_INVALIDDATA;
333 
334  v = avio_rb32(pb);
335  if (v == AUDIO_FORMAT_SIGNED) {
337  } else {
338  avpriv_request_sample(avctx, "Audio compression (format %i)", v);
339  }
340 
341  avio_skip(pb, 12);
342  var_read_metadata(avctx, "title", 0x80);
343  var_read_metadata(avctx, "comment", 0x100);
344  avio_skip(pb, 0x80);
345 
346  timestamp = 0;
347  for (i = 0; i < vst->nb_frames; i++) {
348  uint32_t pos = avio_rb32(pb);
349  uint32_t asize = avio_rb32(pb);
350  uint32_t vsize = avio_rb32(pb);
351  if (avio_feof(pb))
352  return AVERROR_INVALIDDATA;
353  avio_skip(pb, 8);
354  av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
355  av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
356  timestamp += asize / (ast->codecpar->channels * 2);
357  }
358  } else if (!version && avio_rb16(pb) == 3) {
359  avio_skip(pb, 4);
360 
361  if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
362  return ret;
363 
364  if (mv->nb_audio_tracks > 1) {
365  avpriv_request_sample(avctx, "Multiple audio streams support");
366  return AVERROR_PATCHWELCOME;
367  } else if (mv->nb_audio_tracks) {
368  ast = avformat_new_stream(avctx, NULL);
369  if (!ast)
370  return AVERROR(ENOMEM);
372  if ((read_table(avctx, ast, parse_audio_var)) < 0)
373  return ret;
374  if (mv->acompression == 100 &&
375  mv->aformat == AUDIO_FORMAT_SIGNED &&
376  ast->codecpar->bits_per_coded_sample == 16) {
378  } else {
379  avpriv_request_sample(avctx,
380  "Audio compression %i (format %i, sr %i)",
381  mv->acompression, mv->aformat,
384  }
385  if (ast->codecpar->channels <= 0) {
386  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
387  return AVERROR_INVALIDDATA;
388  }
389  }
390 
391  if (mv->nb_video_tracks > 1) {
392  avpriv_request_sample(avctx, "Multiple video streams support");
393  return AVERROR_PATCHWELCOME;
394  } else if (mv->nb_video_tracks) {
395  vst = avformat_new_stream(avctx, NULL);
396  if (!vst)
397  return AVERROR(ENOMEM);
398  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
399  if ((ret = read_table(avctx, vst, parse_video_var))<0)
400  return ret;
401  }
402 
403  if (mv->nb_audio_tracks)
404  read_index(pb, ast);
405 
406  if (mv->nb_video_tracks)
407  read_index(pb, vst);
408  } else {
409  avpriv_request_sample(avctx, "Version %i", version);
410  return AVERROR_PATCHWELCOME;
411  }
412 
413  return 0;
414 }
415 
417 {
418  MvContext *mv = avctx->priv_data;
419  AVIOContext *pb = avctx->pb;
420  AVStream *st = avctx->streams[mv->stream_index];
421  const AVIndexEntry *index;
422  int frame = mv->frame[mv->stream_index];
423  int64_t ret;
424  uint64_t pos;
425 
426  if (frame < st->nb_index_entries) {
427  index = &st->index_entries[frame];
428  pos = avio_tell(pb);
429  if (index->pos > pos)
430  avio_skip(pb, index->pos - pos);
431  else if (index->pos < pos) {
432  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
433  return AVERROR(EIO);
434  ret = avio_seek(pb, index->pos, SEEK_SET);
435  if (ret < 0)
436  return ret;
437  }
438  ret = av_get_packet(pb, pkt, index->size);
439  if (ret < 0)
440  return ret;
441 
442  pkt->stream_index = mv->stream_index;
443  pkt->pts = index->timestamp;
444  pkt->flags |= AV_PKT_FLAG_KEY;
445 
446  mv->frame[mv->stream_index]++;
447  mv->eof_count = 0;
448  } else {
449  mv->eof_count++;
450  if (mv->eof_count >= avctx->nb_streams)
451  return AVERROR_EOF;
452 
453  // avoid returning 0 without a packet
454  return AVERROR(EAGAIN);
455  }
456 
457  mv->stream_index++;
458  if (mv->stream_index >= avctx->nb_streams)
459  mv->stream_index = 0;
460 
461  return 0;
462 }
463 
465  int64_t timestamp, int flags)
466 {
467  MvContext *mv = avctx->priv_data;
468  AVStream *st = avctx->streams[stream_index];
469  int frame, i;
470 
471  if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
472  return AVERROR(ENOSYS);
473 
474  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
475  return AVERROR(EIO);
476 
477  frame = av_index_search_timestamp(st, timestamp, flags);
478  if (frame < 0)
479  return AVERROR_INVALIDDATA;
480 
481  for (i = 0; i < avctx->nb_streams; i++)
482  mv->frame[i] = frame;
483  return 0;
484 }
485 
487  .name = "mv",
488  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
489  .priv_data_size = sizeof(MvContext),
490  .read_probe = mv_probe,
494 };
#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:276
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:2039
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:4882
int64_t pos
Definition: avformat.h:810
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:3953
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:331
int version
Definition: avisynth_c.h:858
static AVPacket pkt
#define AV_CH_LAYOUT_STEREO
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:786
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:416
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
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4019
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:801
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:4455
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:1496
#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:4055
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:648
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1509
#define AVINDEX_KEYFRAME
Definition: avformat.h:817
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:260
#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:2148
static int mv_read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mvdec.c:464
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:3949
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:1483
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3971
static int read_table(AVFormatContext *avctx, AVStream *st, int(*parse)(AVFormatContext *avctx, AVStream *st, const char *name, int size))
Definition: mvdec.c:226
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:259
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:486
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:4063
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:3995
#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:3967
int channels
Audio only.
Definition: avcodec.h:4059
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:880
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:358
int stream_index
Definition: avcodec.h:1479
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:1454
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
simple arithmetic expression evaluator
const char * name
Definition: opengl_enc.c:102