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)
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  if (st->codecpar->sample_rate <= 0)
161  return AVERROR_INVALIDDATA;
162  avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
163  } else if (!strcmp(name, "SAMPLE_WIDTH")) {
164  uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
165  if (bpc > 16)
166  return AVERROR_INVALIDDATA;
167  st->codecpar->bits_per_coded_sample = bpc;
168  } else
169  return AVERROR_INVALIDDATA;
170 
171  return 0;
172 }
173 
174 /**
175  * Parse video variable
176  * @return < 0 if unknown
177  */
178 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
179  const char *name, int size)
180 {
181  AVIOContext *pb = avctx->pb;
182  if (!strcmp(name, "__DIR_COUNT")) {
183  st->nb_frames = st->duration = var_read_int(pb, size);
184  } else if (!strcmp(name, "COMPRESSION")) {
185  char *str = var_read_string(pb, size);
186  if (!str)
187  return AVERROR_INVALIDDATA;
188  if (!strcmp(str, "1")) {
190  } else if (!strcmp(str, "2")) {
193  } else if (!strcmp(str, "3")) {
195  } else if (!strcmp(str, "10")) {
197  } else if (!strcmp(str, "MVC2")) {
199  } else {
200  avpriv_request_sample(avctx, "Video compression %s", str);
201  }
202  av_free(str);
203  } else if (!strcmp(name, "FPS")) {
204  AVRational fps = var_read_float(pb, size);
205  avpriv_set_pts_info(st, 64, fps.den, fps.num);
206  st->avg_frame_rate = fps;
207  } else if (!strcmp(name, "HEIGHT")) {
208  st->codecpar->height = var_read_int(pb, size);
209  } else if (!strcmp(name, "PIXEL_ASPECT")) {
213  INT_MAX);
214  } else if (!strcmp(name, "WIDTH")) {
215  st->codecpar->width = var_read_int(pb, size);
216  } else if (!strcmp(name, "ORIENTATION")) {
217  if (var_read_int(pb, size) == 1101) {
218  if (!st->codecpar->extradata) {
219  st->codecpar->extradata = av_strdup("BottomUp");
220  if (!st->codecpar->extradata)
221  return AVERROR(ENOMEM);
222  st->codecpar->extradata_size = 9;
223  }
224  }
225  } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
226  var_read_metadata(avctx, name, size);
227  } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
228  avio_skip(pb, size); // ignore
229  } else
230  return AVERROR_INVALIDDATA;
231 
232  return 0;
233 }
234 
235 static int read_table(AVFormatContext *avctx, AVStream *st,
236  int (*parse)(AVFormatContext *avctx, AVStream *st,
237  const char *name, int size))
238 {
239  unsigned count;
240  int i;
241 
242  AVIOContext *pb = avctx->pb;
243  avio_skip(pb, 4);
244  count = avio_rb32(pb);
245  avio_skip(pb, 4);
246  for (i = 0; i < count; i++) {
247  char name[17];
248  int size;
249 
250  if (avio_feof(pb))
251  return AVERROR_EOF;
252 
253  avio_read(pb, name, 16);
254  name[sizeof(name) - 1] = 0;
255  size = avio_rb32(pb);
256  if (size < 0) {
257  av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
258  return AVERROR_INVALIDDATA;
259  }
260  if (parse(avctx, st, name, size) < 0) {
261  avpriv_request_sample(avctx, "Variable %s", name);
262  avio_skip(pb, size);
263  }
264  }
265  return 0;
266 }
267 
268 static void read_index(AVIOContext *pb, AVStream *st)
269 {
270  uint64_t timestamp = 0;
271  int i;
272  for (i = 0; i < st->nb_frames; i++) {
273  uint32_t pos = avio_rb32(pb);
274  uint32_t size = avio_rb32(pb);
275  avio_skip(pb, 8);
276  if (avio_feof(pb))
277  return ;
278  av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
279  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
280  timestamp += size / (st->codecpar->channels * 2LL);
281  } else {
282  timestamp++;
283  }
284  }
285 }
286 
287 static int mv_read_header(AVFormatContext *avctx)
288 {
289  MvContext *mv = avctx->priv_data;
290  AVIOContext *pb = avctx->pb;
291  AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
292  int version, i;
293  int ret;
294 
295  avio_skip(pb, 4);
296 
297  version = avio_rb16(pb);
298  if (version == 2) {
299  uint64_t timestamp;
300  int v;
301  avio_skip(pb, 22);
302 
303  /* allocate audio track first to prevent unnecessary seeking
304  * (audio packet always precede video packet for a given frame) */
305  ast = avformat_new_stream(avctx, NULL);
306  if (!ast)
307  return AVERROR(ENOMEM);
308 
309  vst = avformat_new_stream(avctx, NULL);
310  if (!vst)
311  return AVERROR(ENOMEM);
312  avpriv_set_pts_info(vst, 64, 1, 15);
313  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
314  vst->avg_frame_rate = av_inv_q(vst->time_base);
315  vst->nb_frames = avio_rb32(pb);
316  v = avio_rb32(pb);
317  switch (v) {
318  case 1:
319  vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
320  break;
321  case 2:
322  vst->codecpar->format = AV_PIX_FMT_ARGB;
323  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
324  break;
325  default:
326  avpriv_request_sample(avctx, "Video compression %i", v);
327  break;
328  }
329  vst->codecpar->codec_tag = 0;
330  vst->codecpar->width = avio_rb32(pb);
331  vst->codecpar->height = avio_rb32(pb);
332  avio_skip(pb, 12);
333 
335  ast->nb_frames = vst->nb_frames;
336  ast->codecpar->sample_rate = avio_rb32(pb);
337  if (ast->codecpar->sample_rate <= 0) {
338  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
339  return AVERROR_INVALIDDATA;
340  }
341  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
342  if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
343  return AVERROR_INVALIDDATA;
344 
345  v = avio_rb32(pb);
346  if (v == AUDIO_FORMAT_SIGNED) {
348  } else {
349  avpriv_request_sample(avctx, "Audio compression (format %i)", v);
350  }
351 
352  avio_skip(pb, 12);
353  var_read_metadata(avctx, "title", 0x80);
354  var_read_metadata(avctx, "comment", 0x100);
355  avio_skip(pb, 0x80);
356 
357  timestamp = 0;
358  for (i = 0; i < vst->nb_frames; i++) {
359  uint32_t pos = avio_rb32(pb);
360  uint32_t asize = avio_rb32(pb);
361  uint32_t vsize = avio_rb32(pb);
362  if (avio_feof(pb))
363  return AVERROR_INVALIDDATA;
364  avio_skip(pb, 8);
365  av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
366  av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
367  timestamp += asize / (ast->codecpar->channels * 2LL);
368  }
369  } else if (!version && avio_rb16(pb) == 3) {
370  avio_skip(pb, 4);
371 
372  if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
373  return ret;
374 
375  if (mv->nb_audio_tracks < 0 || mv->nb_video_tracks < 0 ||
376  (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
377  av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
378  return AVERROR_INVALIDDATA;
379  }
380 
381  if (mv->nb_audio_tracks > 1) {
382  avpriv_request_sample(avctx, "Multiple audio streams support");
383  return AVERROR_PATCHWELCOME;
384  } else if (mv->nb_audio_tracks) {
385  ast = avformat_new_stream(avctx, NULL);
386  if (!ast)
387  return AVERROR(ENOMEM);
389  if ((read_table(avctx, ast, parse_audio_var)) < 0)
390  return ret;
391  if (mv->acompression == 100 &&
392  mv->aformat == AUDIO_FORMAT_SIGNED &&
393  ast->codecpar->bits_per_coded_sample == 16) {
395  } else {
396  avpriv_request_sample(avctx,
397  "Audio compression %i (format %i, sr %i)",
398  mv->acompression, mv->aformat,
401  }
402  if (ast->codecpar->channels <= 0) {
403  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
404  return AVERROR_INVALIDDATA;
405  }
406  }
407 
408  if (mv->nb_video_tracks > 1) {
409  avpriv_request_sample(avctx, "Multiple video streams support");
410  return AVERROR_PATCHWELCOME;
411  } else if (mv->nb_video_tracks) {
412  vst = avformat_new_stream(avctx, NULL);
413  if (!vst)
414  return AVERROR(ENOMEM);
415  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
416  if ((ret = read_table(avctx, vst, parse_video_var))<0)
417  return ret;
418  }
419 
420  if (mv->nb_audio_tracks)
421  read_index(pb, ast);
422 
423  if (mv->nb_video_tracks)
424  read_index(pb, vst);
425  } else {
426  avpriv_request_sample(avctx, "Version %i", version);
427  return AVERROR_PATCHWELCOME;
428  }
429 
430  return 0;
431 }
432 
434 {
435  MvContext *mv = avctx->priv_data;
436  AVIOContext *pb = avctx->pb;
437  AVStream *st = avctx->streams[mv->stream_index];
438  const AVIndexEntry *index;
439  int frame = mv->frame[mv->stream_index];
440  int64_t ret;
441  uint64_t pos;
442 
443  if (frame < st->internal->nb_index_entries) {
445  pos = avio_tell(pb);
446  if (index->pos > pos)
447  avio_skip(pb, index->pos - pos);
448  else if (index->pos < pos) {
449  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
450  return AVERROR(EIO);
451  ret = avio_seek(pb, index->pos, SEEK_SET);
452  if (ret < 0)
453  return ret;
454  }
455  ret = av_get_packet(pb, pkt, index->size);
456  if (ret < 0)
457  return ret;
458 
459  pkt->stream_index = mv->stream_index;
460  pkt->pts = index->timestamp;
462 
463  mv->frame[mv->stream_index]++;
464  mv->eof_count = 0;
465  } else {
466  mv->eof_count++;
467  if (mv->eof_count >= avctx->nb_streams)
468  return AVERROR_EOF;
469 
470  // avoid returning 0 without a packet
471  return AVERROR(EAGAIN);
472  }
473 
474  mv->stream_index++;
475  if (mv->stream_index >= avctx->nb_streams)
476  mv->stream_index = 0;
477 
478  return 0;
479 }
480 
481 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
482  int64_t timestamp, int flags)
483 {
484  MvContext *mv = avctx->priv_data;
485  AVStream *st = avctx->streams[stream_index];
486  int frame, i;
487 
489  return AVERROR(ENOSYS);
490 
491  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
492  return AVERROR(EIO);
493 
494  frame = av_index_search_timestamp(st, timestamp, flags);
495  if (frame < 0)
496  return AVERROR_INVALIDDATA;
497 
498  for (i = 0; i < avctx->nb_streams; i++)
499  mv->frame[i] = frame;
500  return 0;
501 }
502 
504  .name = "mv",
505  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
506  .priv_data_size = sizeof(MvContext),
507  .read_probe = mv_probe,
511 };
MvContext::nb_video_tracks
int nb_video_tracks
Definition: mvdec.c:36
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
name
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option name
Definition: writing_filters.txt:88
MvContext::eof_count
int eof_count
number of streams that have finished
Definition: mvdec.c:39
MvContext::frame
int frame[2]
frame nb for current stream
Definition: mvdec.c:41
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4374
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2159
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
var_read_string
static char * var_read_string(AVIOContext *pb, int size)
Definition: mvdec.c:57
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
set_channels
static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
Definition: mvdec.c:103
rational.h
mv
static const int8_t mv[256][2]
Definition: 4xm.c:79
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
AV_CODEC_ID_MVC2
@ AV_CODEC_ID_MVC2
Definition: codec_id.h:234
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1174
index
fg index
Definition: ffmpeg_filter.c:168
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1008
parse
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
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:899
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2157
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:396
AVIndexEntry
Definition: avformat.h:762
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:770
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
return
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a it should return
Definition: filter_design.txt:264
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:313
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
av_add_index_entry
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:1937
AUDIO_FORMAT_SIGNED
#define AUDIO_FORMAT_SIGNED
Definition: mvdec.c:47
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:875
var_read_int
static int var_read_int(AVIOContext *pb, int size)
Definition: mvdec.c:74
av_reduce
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::num
int num
Numerator.
Definition: rational.h:59
AV_CH_LAYOUT_STEREO
#define AV_CH_LAYOUT_STEREO
Definition: channel_layout.h:91
AV_DICT_DONT_STRDUP_VAL
#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
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:764
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1329
AVInputFormat
Definition: avformat.h:616
MvContext::aformat
int aformat
audio format
Definition: mvdec.c:44
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:621
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
channels
channels
Definition: aptx.h:33
AVFormatContext
Format I/O context.
Definition: avformat.h:1106
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:979
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
parse_audio_var
static int parse_audio_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse audio variable.
Definition: mvdec.c:143
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
var_read_metadata
static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
Definition: mvdec.c:96
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
mv_read_packet
static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: mvdec.c:433
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1148
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
parse_video_var
static int parse_video_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse video variable.
Definition: mvdec.c:178
parse_global_var
static int parse_global_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse global variable.
Definition: mvdec.c:119
AV_PIX_FMT_ABGR
@ AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:94
MvContext::stream_index
int stream_index
current stream index
Definition: mvdec.c:40
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:877
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1162
eval.h
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AVIOContext::seekable
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
avpriv_set_pts_info
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:4799
avio_get_str
int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a string from pb into buf.
Definition: aviobuf.c:843
size
int size
Definition: twinvq_data.h:10344
ff_mv_demuxer
const AVInputFormat ff_mv_demuxer
Definition: mvdec.c:503
AV_RB32
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:96
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: common.h:479
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:888
AVStreamInternal::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:250
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:371
mv_probe
static int mv_probe(const AVProbeData *p)
Definition: mvdec.c:49
version
version
Definition: libkvazaar.c:306
AV_PIX_FMT_ARGB
@ AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:92
AV_CODEC_ID_MJPEG
@ AV_CODEC_ID_MJPEG
Definition: codec_id.h:56
mv_read_seek
static int mv_read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mvdec.c:481
i
int i
Definition: input.c:407
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:358
AVCodecParameters::height
int height
Definition: codec_par.h:127
value
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default value
Definition: writing_filters.txt:86
av_d2q
AVRational av_d2q(double d, int max)
Convert a double precision floating point number to a rational.
Definition: rational.c:106
av_inv_q
static av_always_inline AVRational av_inv_q(AVRational q)
Invert a rational.
Definition: rational.h:159
MvContext
Definition: mvdec.c:35
AV_CODEC_ID_MVC1
@ AV_CODEC_ID_MVC1
Definition: codec_id.h:233
av_get_packet
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:280
read_index
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:268
tag
uint32_t tag
Definition: movenc.c:1594
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:832
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:243
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
av_strtod
double av_strtod(const char *numstr, char **tail)
Parse the string in numstr and return its value as a double.
Definition: eval.c:106
avio_rb16
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:749
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
mv_read_header
static int mv_read_header(AVFormatContext *avctx)
Definition: mvdec.c:287
channel_layout.h
AVIO_SEEKABLE_NORMAL
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
AVRational::den
int den
Denominator.
Definition: rational.h:60
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
AVPacket::stream_index
int stream_index
Definition: packet.h:367
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:327
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:259
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
MvContext::nb_audio_tracks
int nb_audio_tracks
Definition: mvdec.c:37
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
AVCodecParameters::format
int format
Definition: codec_par.h:84
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:342
MvContext::acompression
int acompression
compression level for audio stream
Definition: mvdec.c:43
AV_CODEC_ID_SGIRLE
@ AV_CODEC_ID_SGIRLE
Definition: codec_id.h:232
av_dict_set
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
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
read_table
static int read_table(AVFormatContext *avctx, AVStream *st, int(*parse)(AVFormatContext *avctx, AVStream *st, const char *name, int size))
Definition: mvdec.c:235
convert_header.str
string str
Definition: convert_header.py:20
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
var_read_float
static AVRational var_read_float(AVIOContext *pb, int size)
Definition: mvdec.c:85
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1134
AV_RB16
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:98
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2054
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:354