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")) {
159  int sample_rate = var_read_int(pb, size);
160  if (sample_rate <= 0)
161  return AVERROR_INVALIDDATA;
163  avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
164  } else if (!strcmp(name, "SAMPLE_WIDTH")) {
165  uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
166  if (bpc > 16)
167  return AVERROR_INVALIDDATA;
168  st->codecpar->bits_per_coded_sample = bpc;
169  } else
170  return AVERROR_INVALIDDATA;
171 
172  return 0;
173 }
174 
175 /**
176  * Parse video variable
177  * @return < 0 if unknown
178  */
179 static int parse_video_var(AVFormatContext *avctx, AVStream *st,
180  const char *name, int size)
181 {
182  AVIOContext *pb = avctx->pb;
183  if (!strcmp(name, "__DIR_COUNT")) {
184  st->nb_frames = st->duration = var_read_int(pb, size);
185  } else if (!strcmp(name, "COMPRESSION")) {
186  char *str = var_read_string(pb, size);
187  if (!str)
188  return AVERROR_INVALIDDATA;
189  if (!strcmp(str, "1")) {
191  } else if (!strcmp(str, "2")) {
194  } else if (!strcmp(str, "3")) {
196  } else if (!strcmp(str, "10")) {
198  } else if (!strcmp(str, "MVC2")) {
200  } else {
201  avpriv_request_sample(avctx, "Video compression %s", str);
202  }
203  av_free(str);
204  } else if (!strcmp(name, "FPS")) {
205  AVRational fps = var_read_float(pb, size);
206  avpriv_set_pts_info(st, 64, fps.den, fps.num);
207  st->avg_frame_rate = fps;
208  } else if (!strcmp(name, "HEIGHT")) {
209  st->codecpar->height = var_read_int(pb, size);
210  } else if (!strcmp(name, "PIXEL_ASPECT")) {
214  INT_MAX);
215  } else if (!strcmp(name, "WIDTH")) {
216  st->codecpar->width = var_read_int(pb, size);
217  } else if (!strcmp(name, "ORIENTATION")) {
218  if (var_read_int(pb, size) == 1101) {
219  if (!st->codecpar->extradata) {
220  st->codecpar->extradata = av_strdup("BottomUp");
221  if (!st->codecpar->extradata)
222  return AVERROR(ENOMEM);
223  st->codecpar->extradata_size = 9;
224  }
225  }
226  } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
227  var_read_metadata(avctx, name, size);
228  } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
229  avio_skip(pb, size); // ignore
230  } else
231  return AVERROR_INVALIDDATA;
232 
233  return 0;
234 }
235 
236 static int read_table(AVFormatContext *avctx, AVStream *st,
237  int (*parse)(AVFormatContext *avctx, AVStream *st,
238  const char *name, int size))
239 {
240  unsigned count;
241  int i;
242 
243  AVIOContext *pb = avctx->pb;
244  avio_skip(pb, 4);
245  count = avio_rb32(pb);
246  avio_skip(pb, 4);
247  for (i = 0; i < count; i++) {
248  char name[17];
249  int size;
250 
251  if (avio_feof(pb))
252  return AVERROR_EOF;
253 
254  avio_read(pb, name, 16);
255  name[sizeof(name) - 1] = 0;
256  size = avio_rb32(pb);
257  if (size < 0) {
258  av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
259  return AVERROR_INVALIDDATA;
260  }
261  if (parse(avctx, st, name, size) < 0) {
262  avpriv_request_sample(avctx, "Variable %s", name);
263  avio_skip(pb, size);
264  }
265  }
266  return 0;
267 }
268 
269 static void read_index(AVIOContext *pb, AVStream *st)
270 {
271  uint64_t timestamp = 0;
272  int i;
273  for (i = 0; i < st->nb_frames; i++) {
274  uint32_t pos = avio_rb32(pb);
275  uint32_t size = avio_rb32(pb);
276  avio_skip(pb, 8);
277  if (avio_feof(pb))
278  return ;
279  av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
280  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
281  timestamp += size / (st->codecpar->channels * 2LL);
282  } else {
283  timestamp++;
284  }
285  }
286 }
287 
288 static int mv_read_header(AVFormatContext *avctx)
289 {
290  MvContext *mv = avctx->priv_data;
291  AVIOContext *pb = avctx->pb;
292  AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
293  int version, i;
294  int ret;
295 
296  avio_skip(pb, 4);
297 
298  version = avio_rb16(pb);
299  if (version == 2) {
300  uint64_t timestamp;
301  int v;
302  avio_skip(pb, 22);
303 
304  /* allocate audio track first to prevent unnecessary seeking
305  * (audio packet always precede video packet for a given frame) */
306  ast = avformat_new_stream(avctx, NULL);
307  if (!ast)
308  return AVERROR(ENOMEM);
309 
310  vst = avformat_new_stream(avctx, NULL);
311  if (!vst)
312  return AVERROR(ENOMEM);
313  avpriv_set_pts_info(vst, 64, 1, 15);
314  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
315  vst->avg_frame_rate = av_inv_q(vst->time_base);
316  vst->nb_frames = avio_rb32(pb);
317  v = avio_rb32(pb);
318  switch (v) {
319  case 1:
320  vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
321  break;
322  case 2:
323  vst->codecpar->format = AV_PIX_FMT_ARGB;
324  vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
325  break;
326  default:
327  avpriv_request_sample(avctx, "Video compression %i", v);
328  break;
329  }
330  vst->codecpar->codec_tag = 0;
331  vst->codecpar->width = avio_rb32(pb);
332  vst->codecpar->height = avio_rb32(pb);
333  avio_skip(pb, 12);
334 
336  ast->nb_frames = vst->nb_frames;
337  ast->codecpar->sample_rate = avio_rb32(pb);
338  if (ast->codecpar->sample_rate <= 0) {
339  av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
340  return AVERROR_INVALIDDATA;
341  }
342  avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
343  if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
344  return AVERROR_INVALIDDATA;
345 
346  v = avio_rb32(pb);
347  if (v == AUDIO_FORMAT_SIGNED) {
349  } else {
350  avpriv_request_sample(avctx, "Audio compression (format %i)", v);
351  }
352 
353  avio_skip(pb, 12);
354  var_read_metadata(avctx, "title", 0x80);
355  var_read_metadata(avctx, "comment", 0x100);
356  avio_skip(pb, 0x80);
357 
358  timestamp = 0;
359  for (i = 0; i < vst->nb_frames; i++) {
360  uint32_t pos = avio_rb32(pb);
361  uint32_t asize = avio_rb32(pb);
362  uint32_t vsize = avio_rb32(pb);
363  if (avio_feof(pb))
364  return AVERROR_INVALIDDATA;
365  avio_skip(pb, 8);
366  av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
367  av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
368  timestamp += asize / (ast->codecpar->channels * 2LL);
369  }
370  } else if (!version && avio_rb16(pb) == 3) {
371  avio_skip(pb, 4);
372 
373  if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
374  return ret;
375 
376  if (mv->nb_audio_tracks < 0 || mv->nb_video_tracks < 0 ||
377  (mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
378  av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
379  return AVERROR_INVALIDDATA;
380  }
381 
382  if (mv->nb_audio_tracks > 1) {
383  avpriv_request_sample(avctx, "Multiple audio streams support");
384  return AVERROR_PATCHWELCOME;
385  } else if (mv->nb_audio_tracks) {
386  ast = avformat_new_stream(avctx, NULL);
387  if (!ast)
388  return AVERROR(ENOMEM);
390  if ((ret = read_table(avctx, ast, parse_audio_var)) < 0)
391  return ret;
392  if (mv->acompression == 100 &&
393  mv->aformat == AUDIO_FORMAT_SIGNED &&
394  ast->codecpar->bits_per_coded_sample == 16) {
396  } else {
397  avpriv_request_sample(avctx,
398  "Audio compression %i (format %i, sr %i)",
399  mv->acompression, mv->aformat,
402  }
403  if (ast->codecpar->channels <= 0) {
404  av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
405  return AVERROR_INVALIDDATA;
406  }
407  }
408 
409  if (mv->nb_video_tracks > 1) {
410  avpriv_request_sample(avctx, "Multiple video streams support");
411  return AVERROR_PATCHWELCOME;
412  } else if (mv->nb_video_tracks) {
413  vst = avformat_new_stream(avctx, NULL);
414  if (!vst)
415  return AVERROR(ENOMEM);
416  vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
417  if ((ret = read_table(avctx, vst, parse_video_var))<0)
418  return ret;
419  }
420 
421  if (mv->nb_audio_tracks)
422  read_index(pb, ast);
423 
424  if (mv->nb_video_tracks)
425  read_index(pb, vst);
426  } else {
427  avpriv_request_sample(avctx, "Version %i", version);
428  return AVERROR_PATCHWELCOME;
429  }
430 
431  return 0;
432 }
433 
435 {
436  MvContext *mv = avctx->priv_data;
437  AVIOContext *pb = avctx->pb;
438  AVStream *st = avctx->streams[mv->stream_index];
439  FFStream *const sti = ffstream(st);
440  const AVIndexEntry *index;
441  int frame = mv->frame[mv->stream_index];
442  int64_t ret;
443  uint64_t pos;
444 
445  if (frame < sti->nb_index_entries) {
446  index = &sti->index_entries[frame];
447  pos = avio_tell(pb);
448  if (index->pos > pos)
449  avio_skip(pb, index->pos - pos);
450  else if (index->pos < pos) {
451  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
452  return AVERROR(EIO);
453  ret = avio_seek(pb, index->pos, SEEK_SET);
454  if (ret < 0)
455  return ret;
456  }
457  ret = av_get_packet(pb, pkt, index->size);
458  if (ret < 0)
459  return ret;
460 
461  pkt->stream_index = mv->stream_index;
462  pkt->pts = index->timestamp;
464 
465  mv->frame[mv->stream_index]++;
466  mv->eof_count = 0;
467  } else {
468  mv->eof_count++;
469  if (mv->eof_count >= avctx->nb_streams)
470  return AVERROR_EOF;
471 
472  // avoid returning 0 without a packet
473  return AVERROR(EAGAIN);
474  }
475 
476  mv->stream_index++;
477  if (mv->stream_index >= avctx->nb_streams)
478  mv->stream_index = 0;
479 
480  return 0;
481 }
482 
483 static int mv_read_seek(AVFormatContext *avctx, int stream_index,
484  int64_t timestamp, int flags)
485 {
486  MvContext *mv = avctx->priv_data;
487  AVStream *st = avctx->streams[stream_index];
488  int frame, i;
489 
491  return AVERROR(ENOSYS);
492 
493  if (!(avctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
494  return AVERROR(EIO);
495 
496  frame = av_index_search_timestamp(st, timestamp, flags);
497  if (frame < 0)
498  return AVERROR_INVALIDDATA;
499 
500  for (i = 0; i < avctx->nb_streams; i++)
501  mv->frame[i] = frame;
502  return 0;
503 }
504 
506  .name = "mv",
507  .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
508  .priv_data_size = sizeof(MvContext),
509  .read_probe = mv_probe,
513 };
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:724
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:2166
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
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:63
AV_CODEC_ID_MVC2
@ AV_CODEC_ID_MVC2
Definition: codec_id.h:235
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1177
index
fg index
Definition: ffmpeg_filter.c:168
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:924
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2164
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
sample_rate
sample_rate
Definition: ffmpeg_filter.c:156
AVIndexEntry
Definition: avformat.h:789
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:797
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
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
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:429
AV_CODEC_ID_PCM_S16BE
@ AV_CODEC_ID_PCM_S16BE
Definition: codec_id.h:315
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:149
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: seek.c:117
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:486
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:900
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:72
avio_rb32
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:773
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:180
AVFormatContext::metadata
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1338
AVInputFormat
Definition: avformat.h:638
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:643
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
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:1109
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1004
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:64
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:434
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1151
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
parse_video_var
static int parse_video_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
Parse video variable.
Definition: mvdec.c:179
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:902
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:1165
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:262
FFStream
Definition: internal.h:191
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:878
size
int size
Definition: twinvq_data.h:10344
ff_mv_demuxer
const AVInputFormat ff_mv_demuxer
Definition: mvdec.c:505
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
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
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:913
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
mv_probe
static int mv_probe(const AVProbeData *p)
Definition: mvdec.c:49
version
version
Definition: libkvazaar.c:307
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:57
mv_read_seek
static int mv_read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
Definition: mvdec.c:483
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:271
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
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:234
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:196
read_index
static void read_index(AVIOContext *pb, AVStream *st)
Definition: mvdec.c:269
tag
uint32_t tag
Definition: movenc.c:1595
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:857
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
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:758
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
mv_read_header
static int mv_read_header(AVFormatContext *avctx)
Definition: mvdec.c:288
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:625
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:274
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:279
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:37
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:350
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:233
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:236
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:61
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:1137
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: seek.c:237
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360