FFmpeg  4.3
mvdec.c
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1 /*
2  * Silicon Graphics Movie demuxer
3  * Copyright (c) 2012 Peter Ross
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * Silicon Graphics Movie demuxer
25  */
26 
28 #include "libavutil/eval.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/rational.h"
31 
32 #include "avformat.h"
33 #include "internal.h"
34 
35 typedef struct MvContext {
38 
39  int eof_count; ///< number of streams that have finished
40  int stream_index; ///< current stream index
41  int frame[2]; ///< frame nb for current stream
42 
43  int acompression; ///< compression level for audio stream
44  int aformat; ///< audio format
45 } MvContext;
46 
47 #define AUDIO_FORMAT_SIGNED 401
48 
49 static int mv_probe(const AVProbeData *p)
50 {
51  if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
52  AV_RB16(p->buf + 4) < 3)
53  return AVPROBE_SCORE_MAX;
54  return 0;
55 }
56 
57 static char *var_read_string(AVIOContext *pb, int size)
58 {
59  int n;
60  char *str;
61 
62  if (size < 0 || size == INT_MAX)
63  return NULL;
64 
65  str = av_malloc(size + 1);
66  if (!str)
67  return NULL;
68  n = avio_get_str(pb, size, str, size + 1);
69  if (n < size)
70  avio_skip(pb, size - n);
71  return str;
72 }
73 
74 static int var_read_int(AVIOContext *pb, int size)
75 {
76  int v;
77  char *s = var_read_string(pb, size);
78  if (!s)
79  return 0;
80  v = strtol(s, NULL, 10);
81  av_free(s);
82  return v;
83 }
84 
86 {
87  AVRational v;
88  char *s = var_read_string(pb, size);
89  if (!s)
90  return (AVRational) { 0, 0 };
91  v = av_d2q(av_strtod(s, NULL), INT_MAX);
92  av_free(s);
93  return v;
94 }
95 
96 static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
97 {
98  char *value = var_read_string(avctx->pb, size);
99  if (value)
101 }
102 
103 static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
104 {
105  if (channels <= 0) {
106  av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
107  return AVERROR_INVALIDDATA;
108  }
109  st->codecpar->channels = channels;
112  return 0;
113 }
114 
115 /**
116  * Parse global variable
117  * @return < 0 if unknown
118  */
120  const char *name, int size)
121 {
122  MvContext *mv = avctx->priv_data;
123  AVIOContext *pb = avctx->pb;
124  if (!strcmp(name, "__NUM_I_TRACKS")) {
125  mv->nb_video_tracks = var_read_int(pb, size);
126  } else if (!strcmp(name, "__NUM_A_TRACKS")) {
127  mv->nb_audio_tracks = var_read_int(pb, size);
128  } else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
129  var_read_metadata(avctx, name, size);
130  } else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") ||
131  !strcmp(name, "OPTIMIZED")) {
132  avio_skip(pb, size); // ignore
133  } else
134  return AVERROR_INVALIDDATA;
135 
136  return 0;
137 }
138 
139 /**
140  * Parse audio variable
141  * @return < 0 if unknown
142  */
143 static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
144  const char *name, int size)
145 {
146  MvContext *mv = avctx->priv_data;
147  AVIOContext *pb = avctx->pb;
148  if (!strcmp(name, "__DIR_COUNT")) {
149  st->nb_frames = var_read_int(pb, size);
150  } else if (!strcmp(name, "AUDIO_FORMAT")) {
151  mv->aformat = var_read_int(pb, size);
152  } else if (!strcmp(name, "COMPRESSION")) {
153  mv->acompression = var_read_int(pb, size);
154  } else if (!strcmp(name, "DEFAULT_VOL")) {
155  var_read_metadata(avctx, name, size);
156  } else if (!strcmp(name, "NUM_CHANNELS")) {
157  return set_channels(avctx, st, var_read_int(pb, size));
158  } else if (!strcmp(name, "SAMPLE_RATE")) {
160  avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
161  } else if (!strcmp(name, "SAMPLE_WIDTH")) {
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")) {
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 < 0 || mv->nb_video_tracks < 0 ||
367  (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
368  av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
369  return AVERROR_INVALIDDATA;
370  }
371 
372  if (mv->nb_audio_tracks > 1) {
373  avpriv_request_sample(avctx, "Multiple audio streams support");
374  return AVERROR_PATCHWELCOME;
375  } else if (mv->nb_audio_tracks) {
376  ast = avformat_new_stream(avctx, NULL);
377  if (!ast)
378  return AVERROR(ENOMEM);
380  if ((read_table(avctx, ast, parse_audio_var)) < 0)
381  return ret;
382  if (mv->acompression == 100 &&
383  mv->aformat == AUDIO_FORMAT_SIGNED &&
384  ast->codecpar->bits_per_coded_sample == 16) {
386  } else {
387  avpriv_request_sample(avctx,
388  "Audio compression %i (format %i, sr %i)",
389  mv->acompression, mv->aformat,
392  }
393  if (ast->codecpar->channels <= 0) {
394  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
395  return AVERROR_INVALIDDATA;
396  }
397  }
398 
399  if (mv->nb_video_tracks > 1) {
400  avpriv_request_sample(avctx, "Multiple video streams support");
401  return AVERROR_PATCHWELCOME;
402  } else if (mv->nb_video_tracks) {
403  vst = avformat_new_stream(avctx, NULL);
404  if (!vst)
405  return AVERROR(ENOMEM);
406  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
407  if ((ret = read_table(avctx, vst, parse_video_var))<0)
408  return ret;
409  }
410 
411  if (mv->nb_audio_tracks)
412  read_index(pb, ast);
413 
414  if (mv->nb_video_tracks)
415  read_index(pb, vst);
416  } else {
417  avpriv_request_sample(avctx, "Version %i", version);
418  return AVERROR_PATCHWELCOME;
419  }
420 
421  return 0;
422 }
423 
425 {
426  MvContext *mv = avctx->priv_data;
427  AVIOContext *pb = avctx->pb;
428  AVStream *st = avctx->streams[mv->stream_index];
429  const AVIndexEntry *index;
430  int frame = mv->frame[mv->stream_index];
431  int64_t ret;
432  uint64_t pos;
433 
434  if (frame < st->nb_index_entries) {
435  index = &st->index_entries[frame];
436  pos = avio_tell(pb);
437  if (index->pos > pos)
438  avio_skip(pb, index->pos - pos);
439  else if (index->pos < pos) {
440  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
441  return AVERROR(EIO);
442  ret = avio_seek(pb, index->pos, SEEK_SET);
443  if (ret < 0)
444  return ret;
445  }
446  ret = av_get_packet(pb, pkt, index->size);
447  if (ret < 0)
448  return ret;
449 
450  pkt->stream_index = mv->stream_index;
451  pkt->pts = index->timestamp;
453 
454  mv->frame[mv->stream_index]++;
455  mv->eof_count = 0;
456  } else {
457  mv->eof_count++;
458  if (mv->eof_count >= avctx->nb_streams)
459  return AVERROR_EOF;
460 
461  // avoid returning 0 without a packet
462  return AVERROR(EAGAIN);
463  }
464 
465  mv->stream_index++;
466  if (mv->stream_index >= avctx->nb_streams)
467  mv->stream_index = 0;
468 
469  return 0;
470 }
471 
472 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
473  int64_t timestamp, int flags)
474 {
475  MvContext *mv = avctx->priv_data;
476  AVStream *st = avctx->streams[stream_index];
477  int frame, i;
478 
480  return AVERROR(ENOSYS);
481 
482  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
483  return AVERROR(EIO);
484 
485  frame = av_index_search_timestamp(st, timestamp, flags);
486  if (frame < 0)
487  return AVERROR_INVALIDDATA;
488 
489  for (i = 0; i < avctx->nb_streams; i++)
490  mv->frame[i] = frame;
491  return 0;
492 }
493 
495  .name = "mv",
496  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
497  .priv_data_size = sizeof(MvContext),
498  .read_probe = mv_probe,
502 };
AVStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1094
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:4519
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:2499
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:85
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:77
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:1403
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:938
AV_RB16
#define AV_RB16
Definition: intreadwrite.h:53
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2497
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:388
ff_mv_demuxer
AVInputFormat ff_mv_demuxer
Definition: mvdec.c:494
AVIndexEntry
Definition: avformat.h:795
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:803
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
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:302
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:2045
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:914
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:86
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:778
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1575
AVInputFormat
Definition: avformat.h:636
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:641
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:1335
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1012
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:424
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1377
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:173
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_RB32
#define AV_RB32
Definition: intreadwrite.h:130
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
index
int index
Definition: gxfenc.c:89
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:916
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:1391
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:186
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:4938
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:857
size
int size
Definition: twinvq_data.h:11134
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: common.h:407
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:927
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:361
mv_probe
static int mv_probe(const AVProbeData *p)
Definition: mvdec.c:49
version
version
Definition: libkvazaar.c:292
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:472
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
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:304
read_index
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:261
tag
uint32_t tag
Definition: movenc.c:1532
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:865
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:241
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:763
pos
unsigned int pos
Definition: spdifenc.c:410
avformat.h
mv_read_header
static int mv_read_header(AVFormatContext *avctx)
Definition: mvdec.c:278
channel_layout.h
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
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:625
AVPacket::stream_index
int stream_index
Definition: packet.h:357
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:329
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:253
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:332
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:228
convert_header.str
string str
Definition: convert_header.py:20
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:564
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:1363
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:2162
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356