FFmpeg
wavdec.c
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1 /*
2  * WAV demuxer
3  * Copyright (c) 2001, 2002 Fabrice Bellard
4  *
5  * Sony Wave64 demuxer
6  * RF64 demuxer
7  * Copyright (c) 2009 Daniel Verkamp
8  *
9  * This file is part of FFmpeg.
10  *
11  * FFmpeg is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * FFmpeg is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * Lesser General Public License for more details.
20  *
21  * You should have received a copy of the GNU Lesser General Public
22  * License along with FFmpeg; if not, write to the Free Software
23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24  */
25 
26 #include <stdint.h>
27 
28 #include "libavutil/avassert.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/log.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
34 #include "avformat.h"
35 #include "avio.h"
36 #include "avio_internal.h"
37 #include "id3v2.h"
38 #include "internal.h"
39 #include "metadata.h"
40 #include "pcm.h"
41 #include "riff.h"
42 #include "w64.h"
43 #include "spdif.h"
44 
45 typedef struct WAVDemuxContext {
46  const AVClass *class;
47  int64_t data_end;
48  int w64;
49  int64_t smv_data_ofs;
52  int smv_block;
54  int smv_eof;
55  int audio_eof;
57  int spdif;
60  int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended
61  int rifx; // RIFX: integer byte order for parameters is big endian
63 
65 {
66  if (CONFIG_SPDIF_DEMUXER && s->streams[0]->codecpar->codec_tag == 1) {
67  enum AVCodecID codec;
68  int len = 1<<16;
69  int ret = ffio_ensure_seekback(s->pb, len);
70 
71  if (ret >= 0) {
72  uint8_t *buf = av_malloc(len);
73  if (!buf) {
74  ret = AVERROR(ENOMEM);
75  } else {
76  int64_t pos = avio_tell(s->pb);
77  len = ret = avio_read(s->pb, buf, len);
78  if (len >= 0) {
79  ret = ff_spdif_probe(buf, len, &codec);
80  if (ret > AVPROBE_SCORE_EXTENSION) {
81  s->streams[0]->codecpar->codec_id = codec;
82  wav->spdif = 1;
83  }
84  }
85  avio_seek(s->pb, pos, SEEK_SET);
86  av_free(buf);
87  }
88  }
89 
90  if (ret < 0)
91  av_log(s, AV_LOG_WARNING, "Cannot check for SPDIF\n");
92  }
93 }
94 
95 #if CONFIG_WAV_DEMUXER
96 
97 static int64_t next_tag(AVIOContext *pb, uint32_t *tag, int big_endian)
98 {
99  *tag = avio_rl32(pb);
100  if (!big_endian) {
101  return avio_rl32(pb);
102  } else {
103  return avio_rb32(pb);
104  }
105 }
106 
107 /* RIFF chunks are always at even offsets relative to where they start. */
108 static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)
109 {
110  offset += offset < INT64_MAX && offset + wav->unaligned & 1;
111 
112  return avio_seek(s, offset, whence);
113 }
114 
115 /* return the size of the found tag */
116 static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)
117 {
118  unsigned int tag;
119  int64_t size;
120 
121  for (;;) {
122  if (avio_feof(pb))
123  return AVERROR_EOF;
124  size = next_tag(pb, &tag, wav->rifx);
125  if (tag == tag1)
126  break;
127  wav_seek_tag(wav, pb, size, SEEK_CUR);
128  }
129  return size;
130 }
131 
132 static int wav_probe(const AVProbeData *p)
133 {
134  /* check file header */
135  if (p->buf_size <= 32)
136  return 0;
137  if (!memcmp(p->buf + 8, "WAVE", 4)) {
138  if (!memcmp(p->buf, "RIFF", 4) || !memcmp(p->buf, "RIFX", 4))
139  /* Since the ACT demuxer has a standard WAV header at the top of
140  * its own, the returned score is decreased to avoid a probe
141  * conflict between ACT and WAV. */
142  return AVPROBE_SCORE_MAX - 1;
143  else if (!memcmp(p->buf, "RF64", 4) &&
144  !memcmp(p->buf + 12, "ds64", 4))
145  return AVPROBE_SCORE_MAX;
146  }
147  return 0;
148 }
149 
150 static void handle_stream_probing(AVStream *st)
151 {
154  st->probe_packets = FFMIN(st->probe_packets, 32);
155  }
156 }
157 
158 static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
159 {
160  AVIOContext *pb = s->pb;
161  WAVDemuxContext *wav = s->priv_data;
162  int ret;
163 
164  /* parse fmt header */
165  *st = avformat_new_stream(s, NULL);
166  if (!*st)
167  return AVERROR(ENOMEM);
168 
169  ret = ff_get_wav_header(s, pb, (*st)->codecpar, size, wav->rifx);
170  if (ret < 0)
171  return ret;
172  handle_stream_probing(*st);
173 
174  (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
175 
176  avpriv_set_pts_info(*st, 64, 1, (*st)->codecpar->sample_rate);
177 
178  return 0;
179 }
180 
181 static int wav_parse_xma2_tag(AVFormatContext *s, int64_t size, AVStream **st)
182 {
183  AVIOContext *pb = s->pb;
184  int version, num_streams, i, channels = 0;
185 
186  if (size < 36)
187  return AVERROR_INVALIDDATA;
188 
189  *st = avformat_new_stream(s, NULL);
190  if (!*st)
191  return AVERROR(ENOMEM);
192 
193  (*st)->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
194  (*st)->codecpar->codec_id = AV_CODEC_ID_XMA2;
195  (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
196 
197  version = avio_r8(pb);
198  if (version != 3 && version != 4)
199  return AVERROR_INVALIDDATA;
200  num_streams = avio_r8(pb);
201  if (size != (32 + ((version==3)?0:8) + 4*num_streams))
202  return AVERROR_INVALIDDATA;
203  avio_skip(pb, 10);
204  (*st)->codecpar->sample_rate = avio_rb32(pb);
205  if (version == 4)
206  avio_skip(pb, 8);
207  avio_skip(pb, 4);
208  (*st)->duration = avio_rb32(pb);
209  avio_skip(pb, 8);
210 
211  for (i = 0; i < num_streams; i++) {
212  channels += avio_r8(pb);
213  avio_skip(pb, 3);
214  }
215  (*st)->codecpar->channels = channels;
216 
217  if ((*st)->codecpar->channels <= 0 || (*st)->codecpar->sample_rate <= 0)
218  return AVERROR_INVALIDDATA;
219 
220  avpriv_set_pts_info(*st, 64, 1, (*st)->codecpar->sample_rate);
221 
222  avio_seek(pb, -size, SEEK_CUR);
223  av_freep(&(*st)->codecpar->extradata);
224  if (ff_get_extradata(s, (*st)->codecpar, pb, size) < 0)
225  return AVERROR(ENOMEM);
226 
227  return 0;
228 }
229 
230 static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
231  int length)
232 {
233  char temp[257];
234  int ret;
235 
236  av_assert0(length < sizeof(temp));
237  if ((ret = avio_read(s->pb, temp, length)) != length)
238  return ret < 0 ? ret : AVERROR_INVALIDDATA;
239 
240  temp[length] = 0;
241 
242  if (strlen(temp))
243  return av_dict_set(&s->metadata, key, temp, 0);
244 
245  return 0;
246 }
247 
248 static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
249 {
250  char temp[131], *coding_history;
251  int ret, x;
252  uint64_t time_reference;
253  int64_t umid_parts[8], umid_mask = 0;
254 
255  if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
256  (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
257  (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
258  (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
259  (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
260  return ret;
261 
262  time_reference = avio_rl64(s->pb);
263  snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
264  if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
265  return ret;
266 
267  /* check if version is >= 1, in which case an UMID may be present */
268  if (avio_rl16(s->pb) >= 1) {
269  for (x = 0; x < 8; x++)
270  umid_mask |= umid_parts[x] = avio_rb64(s->pb);
271 
272  if (umid_mask) {
273  /* the string formatting below is per SMPTE 330M-2004 Annex C */
274  if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
275  umid_parts[6] == 0 && umid_parts[7] == 0) {
276  /* basic UMID */
277  snprintf(temp, sizeof(temp),
278  "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
279  umid_parts[0], umid_parts[1],
280  umid_parts[2], umid_parts[3]);
281  } else {
282  /* extended UMID */
283  snprintf(temp, sizeof(temp),
284  "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
285  "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
286  umid_parts[0], umid_parts[1],
287  umid_parts[2], umid_parts[3],
288  umid_parts[4], umid_parts[5],
289  umid_parts[6], umid_parts[7]);
290  }
291 
292  if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
293  return ret;
294  }
295 
296  avio_skip(s->pb, 190);
297  } else
298  avio_skip(s->pb, 254);
299 
300  if (size > 602) {
301  /* CodingHistory present */
302  size -= 602;
303 
304  if (!(coding_history = av_malloc(size + 1)))
305  return AVERROR(ENOMEM);
306 
307  if ((ret = avio_read(s->pb, coding_history, size)) != size) {
308  av_free(coding_history);
309  return ret < 0 ? ret : AVERROR_INVALIDDATA;
310  }
311 
312  coding_history[size] = 0;
313  if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
315  return ret;
316  }
317 
318  return 0;
319 }
320 
321 static const AVMetadataConv wav_metadata_conv[] = {
322  { "description", "comment" },
323  { "originator", "encoded_by" },
324  { "origination_date", "date" },
325  { "origination_time", "creation_time" },
326  { 0 },
327 };
328 
329 /* wav input */
330 static int wav_read_header(AVFormatContext *s)
331 {
332  int64_t size, av_uninit(data_size);
333  int64_t sample_count = 0;
334  int rf64 = 0;
335  uint32_t tag;
336  AVIOContext *pb = s->pb;
337  AVStream *st = NULL;
338  WAVDemuxContext *wav = s->priv_data;
339  int ret, got_fmt = 0, got_xma2 = 0;
340  int64_t next_tag_ofs, data_ofs = -1;
341 
342  wav->unaligned = avio_tell(s->pb) & 1;
343 
344  wav->smv_data_ofs = -1;
345 
346  /* read chunk ID */
347  tag = avio_rl32(pb);
348  switch (tag) {
349  case MKTAG('R', 'I', 'F', 'F'):
350  break;
351  case MKTAG('R', 'I', 'F', 'X'):
352  wav->rifx = 1;
353  break;
354  case MKTAG('R', 'F', '6', '4'):
355  rf64 = 1;
356  break;
357  default:
358  av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
359  av_fourcc2str(tag));
360  return AVERROR_INVALIDDATA;
361  }
362 
363  /* read chunk size */
364  avio_rl32(pb);
365 
366  /* read format */
367  if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
368  av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
369  return AVERROR_INVALIDDATA;
370  }
371 
372  if (rf64) {
373  if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
374  return AVERROR_INVALIDDATA;
375  size = avio_rl32(pb);
376  if (size < 24)
377  return AVERROR_INVALIDDATA;
378  avio_rl64(pb); /* RIFF size */
379 
380  data_size = avio_rl64(pb);
381  sample_count = avio_rl64(pb);
382 
383  if (data_size < 0 || sample_count < 0) {
384  av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
385  "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
386  data_size, sample_count);
387  return AVERROR_INVALIDDATA;
388  }
389  avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
390 
391  }
392 
393  for (;;) {
394  AVStream *vst;
395  size = next_tag(pb, &tag, wav->rifx);
396  next_tag_ofs = avio_tell(pb) + size;
397 
398  if (avio_feof(pb))
399  break;
400 
401  switch (tag) {
402  case MKTAG('f', 'm', 't', ' '):
403  /* only parse the first 'fmt ' tag found */
404  if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
405  return ret;
406  } else if (got_fmt)
407  av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
408 
409  got_fmt = 1;
410  break;
411  case MKTAG('X', 'M', 'A', '2'):
412  /* only parse the first 'XMA2' tag found */
413  if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, &st)) < 0) {
414  return ret;
415  } else if (got_xma2)
416  av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
417 
418  got_xma2 = 1;
419  break;
420  case MKTAG('d', 'a', 't', 'a'):
421  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) && !got_fmt && !got_xma2) {
422  av_log(s, AV_LOG_ERROR,
423  "found no 'fmt ' tag before the 'data' tag\n");
424  return AVERROR_INVALIDDATA;
425  }
426 
427  if (rf64) {
428  next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
429  } else if (size != 0xFFFFFFFF) {
430  data_size = size;
431  next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
432  } else {
433  av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
434  "file may be invalid\n");
435  data_size = 0;
436  next_tag_ofs = wav->data_end = INT64_MAX;
437  }
438 
439  data_ofs = avio_tell(pb);
440 
441  /* don't look for footer metadata if we can't seek or if we don't
442  * know where the data tag ends
443  */
444  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || (!rf64 && !size))
445  goto break_loop;
446  break;
447  case MKTAG('f', 'a', 'c', 't'):
448  if (!sample_count)
449  sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
450  break;
451  case MKTAG('b', 'e', 'x', 't'):
452  if ((ret = wav_parse_bext_tag(s, size)) < 0)
453  return ret;
454  break;
455  case MKTAG('S','M','V','0'):
456  if (!got_fmt) {
457  av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
458  return AVERROR_INVALIDDATA;
459  }
460  // SMV file, a wav file with video appended.
461  if (size != MKTAG('0','2','0','0')) {
462  av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
463  goto break_loop;
464  }
465  av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
466  wav->smv_given_first = 0;
467  vst = avformat_new_stream(s, NULL);
468  if (!vst)
469  return AVERROR(ENOMEM);
470  avio_r8(pb);
471  vst->id = 1;
474  vst->codecpar->width = avio_rl24(pb);
475  vst->codecpar->height = avio_rl24(pb);
476  if (ff_alloc_extradata(vst->codecpar, 4)) {
477  av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
478  return AVERROR(ENOMEM);
479  }
480  size = avio_rl24(pb);
481  wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
482  avio_rl24(pb);
483  wav->smv_block_size = avio_rl24(pb);
484  avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
485  vst->duration = avio_rl24(pb);
486  avio_rl24(pb);
487  avio_rl24(pb);
488  wav->smv_frames_per_jpeg = avio_rl24(pb);
489  if (wav->smv_frames_per_jpeg > 65536) {
490  av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
491  return AVERROR_INVALIDDATA;
492  }
494  wav->smv_cur_pt = 0;
495  goto break_loop;
496  case MKTAG('L', 'I', 'S', 'T'):
497  if (size < 4) {
498  av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
499  return AVERROR_INVALIDDATA;
500  }
501  switch (avio_rl32(pb)) {
502  case MKTAG('I', 'N', 'F', 'O'):
503  ff_read_riff_info(s, size - 4);
504  }
505  break;
506  case MKTAG('I', 'D', '3', ' '):
507  case MKTAG('i', 'd', '3', ' '): {
508  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
509  ff_id3v2_read_dict(pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
510  if (id3v2_extra_meta) {
511  ff_id3v2_parse_apic(s, &id3v2_extra_meta);
512  ff_id3v2_parse_chapters(s, &id3v2_extra_meta);
513  ff_id3v2_parse_priv(s, &id3v2_extra_meta);
514  }
515  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
516  }
517  break;
518  }
519 
520  /* seek to next tag unless we know that we'll run into EOF */
521  if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
522  wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
523  break;
524  }
525  }
526 
527 break_loop:
528  if (!got_fmt && !got_xma2) {
529  av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
530  return AVERROR_INVALIDDATA;
531  }
532 
533  if (data_ofs < 0) {
534  av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
535  return AVERROR_INVALIDDATA;
536  }
537 
538  avio_seek(pb, data_ofs, SEEK_SET);
539 
540  if (data_size > (INT64_MAX>>3)) {
541  av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
542  data_size = 0;
543  }
544 
545  if ( st->codecpar->bit_rate > 0 && data_size > 0
546  && st->codecpar->sample_rate > 0
547  && sample_count > 0 && st->codecpar->channels > 1
548  && sample_count % st->codecpar->channels == 0) {
549  if (fabs(8.0 * data_size * st->codecpar->channels * st->codecpar->sample_rate /
550  sample_count /st->codecpar->bit_rate - 1.0) < 0.3)
551  sample_count /= st->codecpar->channels;
552  }
553 
554  if ( data_size > 0 && sample_count && st->codecpar->channels
555  && (data_size << 3) / sample_count / st->codecpar->channels > st->codecpar->bits_per_coded_sample + 1) {
556  av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
557  sample_count = 0;
558  }
559 
560  /* G.729 hack (for Ticket4577)
561  * FIXME: Come up with cleaner, more general solution */
562  if (st->codecpar->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
563  av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
564  sample_count = 0;
565  }
566 
567  if (!sample_count || av_get_exact_bits_per_sample(st->codecpar->codec_id) > 0)
568  if ( st->codecpar->channels
569  && data_size
571  && wav->data_end <= avio_size(pb))
572  sample_count = (data_size << 3)
573  /
574  (st->codecpar->channels * (uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));
575 
576  if (sample_count)
577  st->duration = sample_count;
578 
580  st->codecpar->block_align == st->codecpar->channels * 4 &&
581  st->codecpar->bits_per_coded_sample == 32 &&
582  st->codecpar->extradata_size == 2 &&
583  AV_RL16(st->codecpar->extradata) == 1) {
586  } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE &&
587  st->codecpar->block_align == st->codecpar->channels * 4 &&
588  st->codecpar->bits_per_coded_sample == 24) {
590  } else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
592  st->codecpar->block_align = 2048;
593  } else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2) {
594  st->codecpar->block_align *= st->codecpar->channels;
595  }
596 
597  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
599 
600  set_spdif(s, wav);
601 
602  return 0;
603 }
604 
605 /**
606  * Find chunk with w64 GUID by skipping over other chunks.
607  * @return the size of the found chunk
608  */
609 static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
610 {
611  uint8_t guid[16];
612  int64_t size;
613 
614  while (!avio_feof(pb)) {
615  avio_read(pb, guid, 16);
616  size = avio_rl64(pb);
617  if (size <= 24)
618  return AVERROR_INVALIDDATA;
619  if (!memcmp(guid, guid1, 16))
620  return size;
621  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
622  }
623  return AVERROR_EOF;
624 }
625 
626 #define MAX_SIZE 4096
627 
628 static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
629 {
630  int ret, size;
631  int64_t left;
632  AVStream *st;
633  WAVDemuxContext *wav = s->priv_data;
634 
635  if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
636  return ff_spdif_read_packet(s, pkt);
637 
638  if (wav->smv_data_ofs > 0) {
639  int64_t audio_dts, video_dts;
640 smv_retry:
641  audio_dts = (int32_t)s->streams[0]->cur_dts;
642  video_dts = (int32_t)s->streams[1]->cur_dts;
643 
644  if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
645  /*We always return a video frame first to get the pixel format first*/
646  wav->smv_last_stream = wav->smv_given_first ?
647  av_compare_ts(video_dts, s->streams[1]->time_base,
648  audio_dts, s->streams[0]->time_base) > 0 : 0;
649  wav->smv_given_first = 1;
650  }
651  wav->smv_last_stream = !wav->smv_last_stream;
652  wav->smv_last_stream |= wav->audio_eof;
653  wav->smv_last_stream &= !wav->smv_eof;
654  if (wav->smv_last_stream) {
655  uint64_t old_pos = avio_tell(s->pb);
656  uint64_t new_pos = wav->smv_data_ofs +
657  wav->smv_block * wav->smv_block_size;
658  if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
659  ret = AVERROR_EOF;
660  goto smv_out;
661  }
662  size = avio_rl24(s->pb);
663  ret = av_get_packet(s->pb, pkt, size);
664  if (ret < 0)
665  goto smv_out;
666  pkt->pos -= 3;
667  pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
668  wav->smv_cur_pt++;
669  if (wav->smv_frames_per_jpeg > 0)
670  wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
671  if (!wav->smv_cur_pt)
672  wav->smv_block++;
673 
674  pkt->stream_index = 1;
675 smv_out:
676  avio_seek(s->pb, old_pos, SEEK_SET);
677  if (ret == AVERROR_EOF) {
678  wav->smv_eof = 1;
679  goto smv_retry;
680  }
681  return ret;
682  }
683  }
684 
685  st = s->streams[0];
686 
687  left = wav->data_end - avio_tell(s->pb);
688  if (wav->ignore_length)
689  left = INT_MAX;
690  if (left <= 0) {
691  if (CONFIG_W64_DEMUXER && wav->w64)
692  left = find_guid(s->pb, ff_w64_guid_data) - 24;
693  else
694  left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
695  if (left < 0) {
696  wav->audio_eof = 1;
697  if (wav->smv_data_ofs > 0 && !wav->smv_eof)
698  goto smv_retry;
699  return AVERROR_EOF;
700  }
701  wav->data_end = avio_tell(s->pb) + left;
702  }
703 
704  size = MAX_SIZE;
705  if (st->codecpar->block_align > 1) {
706  if (size < st->codecpar->block_align)
707  size = st->codecpar->block_align;
708  size = (size / st->codecpar->block_align) * st->codecpar->block_align;
709  }
710  size = FFMIN(size, left);
711  ret = av_get_packet(s->pb, pkt, size);
712  if (ret < 0)
713  return ret;
714  pkt->stream_index = 0;
715 
716  return ret;
717 }
718 
719 static int wav_read_seek(AVFormatContext *s,
720  int stream_index, int64_t timestamp, int flags)
721 {
722  WAVDemuxContext *wav = s->priv_data;
723  AVStream *st;
724  wav->smv_eof = 0;
725  wav->audio_eof = 0;
726  if (wav->smv_data_ofs > 0) {
727  int64_t smv_timestamp = timestamp;
728  if (stream_index == 0)
729  smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
730  else
731  timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
732  if (wav->smv_frames_per_jpeg > 0) {
733  wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
734  wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
735  }
736  }
737 
738  st = s->streams[0];
739  switch (st->codecpar->codec_id) {
740  case AV_CODEC_ID_MP2:
741  case AV_CODEC_ID_MP3:
742  case AV_CODEC_ID_AC3:
743  case AV_CODEC_ID_DTS:
744  case AV_CODEC_ID_XMA2:
745  /* use generic seeking with dynamically generated indexes */
746  return -1;
747  default:
748  break;
749  }
750  return ff_pcm_read_seek(s, stream_index, timestamp, flags);
751 }
752 
753 #define OFFSET(x) offsetof(WAVDemuxContext, x)
754 #define DEC AV_OPT_FLAG_DECODING_PARAM
755 static const AVOption demux_options[] = {
756  { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
757  { NULL },
758 };
759 
760 static const AVClass wav_demuxer_class = {
761  .class_name = "WAV demuxer",
762  .item_name = av_default_item_name,
763  .option = demux_options,
764  .version = LIBAVUTIL_VERSION_INT,
765 };
767  .name = "wav",
768  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
769  .priv_data_size = sizeof(WAVDemuxContext),
770  .read_probe = wav_probe,
771  .read_header = wav_read_header,
772  .read_packet = wav_read_packet,
773  .read_seek = wav_read_seek,
775  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
776  .priv_class = &wav_demuxer_class,
777 };
778 #endif /* CONFIG_WAV_DEMUXER */
779 
780 #if CONFIG_W64_DEMUXER
781 static int w64_probe(const AVProbeData *p)
782 {
783  if (p->buf_size <= 40)
784  return 0;
785  if (!memcmp(p->buf, ff_w64_guid_riff, 16) &&
786  !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
787  return AVPROBE_SCORE_MAX;
788  else
789  return 0;
790 }
791 
792 static int w64_read_header(AVFormatContext *s)
793 {
794  int64_t size, data_ofs = 0;
795  AVIOContext *pb = s->pb;
796  WAVDemuxContext *wav = s->priv_data;
797  AVStream *st;
798  uint8_t guid[16];
799  int ret;
800 
801  avio_read(pb, guid, 16);
802  if (memcmp(guid, ff_w64_guid_riff, 16))
803  return AVERROR_INVALIDDATA;
804 
805  /* riff + wave + fmt + sizes */
806  if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
807  return AVERROR_INVALIDDATA;
808 
809  avio_read(pb, guid, 16);
810  if (memcmp(guid, ff_w64_guid_wave, 16)) {
811  av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
812  return AVERROR_INVALIDDATA;
813  }
814 
815  wav->w64 = 1;
816 
817  st = avformat_new_stream(s, NULL);
818  if (!st)
819  return AVERROR(ENOMEM);
820 
821  while (!avio_feof(pb)) {
822  if (avio_read(pb, guid, 16) != 16)
823  break;
824  size = avio_rl64(pb);
825  if (size <= 24 || INT64_MAX - size < avio_tell(pb))
826  return AVERROR_INVALIDDATA;
827 
828  if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
829  /* subtract chunk header size - normal wav file doesn't count it */
830  ret = ff_get_wav_header(s, pb, st->codecpar, size - 24, 0);
831  if (ret < 0)
832  return ret;
833  avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
834 
835  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
836  } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
837  int64_t samples;
838 
839  samples = avio_rl64(pb);
840  if (samples > 0)
841  st->duration = samples;
842  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 32);
843  } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
844  wav->data_end = avio_tell(pb) + size - 24;
845 
846  data_ofs = avio_tell(pb);
847  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
848  break;
849 
850  avio_skip(pb, size - 24);
851  } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
852  int64_t start, end, cur;
853  uint32_t count, chunk_size, i;
854 
855  start = avio_tell(pb);
856  end = start + FFALIGN(size, INT64_C(8)) - 24;
857  count = avio_rl32(pb);
858 
859  for (i = 0; i < count; i++) {
860  char chunk_key[5], *value;
861 
862  if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
863  break;
864 
865  chunk_key[4] = 0;
866  avio_read(pb, chunk_key, 4);
867  chunk_size = avio_rl32(pb);
868  if (chunk_size == UINT32_MAX)
869  return AVERROR_INVALIDDATA;
870 
871  value = av_mallocz(chunk_size + 1);
872  if (!value)
873  return AVERROR(ENOMEM);
874 
875  ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
876  avio_skip(pb, chunk_size - ret);
877 
878  av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
879  }
880 
881  avio_skip(pb, end - avio_tell(pb));
882  } else {
883  av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
884  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
885  }
886  }
887 
888  if (!data_ofs)
889  return AVERROR_EOF;
890 
891  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
893 
894  handle_stream_probing(st);
896 
897  avio_seek(pb, data_ofs, SEEK_SET);
898 
899  set_spdif(s, wav);
900 
901  return 0;
902 }
903 
905  .name = "w64",
906  .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
907  .priv_data_size = sizeof(WAVDemuxContext),
908  .read_probe = w64_probe,
909  .read_header = w64_read_header,
910  .read_packet = wav_read_packet,
911  .read_seek = wav_read_seek,
913  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
914 };
915 #endif /* CONFIG_W64_DEMUXER */
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:230
#define NULL
Definition: coverity.c:32
AVDictionary * id3v2_meta
ID3v2 tag useful for MP3 demuxing.
Definition: internal.h:141
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int64_t video_dts
Definition: movenc.c:60
void ff_metadata_conv_ctx(AVFormatContext *ctx, const AVMetadataConv *d_conv, const AVMetadataConv *s_conv)
Definition: metadata.c:59
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:339
const uint8_t ff_w64_guid_wave[16]
Definition: w64.c:28
Buffered I/O operations.
int ff_spdif_probe(const uint8_t *p_buf, int buf_size, enum AVCodecID *codec)
Definition: spdifdec.c:116
AVOption.
Definition: opt.h:246
const uint8_t ff_w64_guid_fact[16]
Definition: w64.c:38
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1500
else temp
Definition: vf_mcdeint.c:256
#define FF_ARG_GUID(g)
Definition: riff.h:105
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4926
int probe_packets
Number of packets to buffer for codec probing.
Definition: avformat.h:1091
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
channels
Definition: aptx.c:30
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
#define ID3v2_DEFAULT_MAGIC
Default magic bytes for ID3v2 header: "ID3".
Definition: id3v2.h:35
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1811
int smv_frames_per_jpeg
Definition: wavdec.c:51
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
Definition: wavdec.c:64
const char * key
int version
Definition: avisynth_c.h:858
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static AVPacket pkt
int ff_id3v2_parse_apic(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create a stream for each APIC (attached picture) extracted from the ID3v2 header. ...
Definition: id3v2.c:1143
#define MAX_SIZE
Definition: vf_unsharp.c:303
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:87
int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen)
Read a UTF-16 string from pb and convert it to UTF-8.
int ignore_length
Definition: wavdec.c:56
Format I/O context.
Definition: avformat.h:1358
static const GUIDParseTable * find_guid(ff_asf_guid guid)
Definition: asfdec_o.c:1658
int64_t audio_dts
Definition: movenc.c:60
int64_t cur_dts
Definition: avformat.h:1084
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
internal metadata API header see avformat.h or the public API!
Public dictionary API.
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4034
AVOptions.
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1183
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
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 offset
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
enum AVStreamParseType need_parsing
Definition: avformat.h:1099
int id
Format-specific stream ID.
Definition: avformat.h:888
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:108
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4499
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
uint32_t tag
Definition: movenc.c:1531
#define AVERROR_EOF
End of file.
Definition: error.h:55
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:924
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
#define FFALIGN(x, a)
Definition: macros.h:48
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:804
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par, int size, int big_endian)
Definition: riffdec.c:91
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3997
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
int ff_spdif_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: spdifdec.c:173
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1528
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta **extra_meta)
Add metadata for all PRIV tags in the ID3v2 header.
Definition: id3v2.c:1276
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:566
#define av_fourcc2str(fourcc)
Definition: avutil.h:348
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 keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your local see the OFFSET() macro
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1127
simple assert() macros that are a bit more flexible than ISO C assert().
GLsizei GLsizei * length
Definition: opengl_enc.c:114
int smv_block_size
Definition: wavdec.c:50
int smv_cur_pt
Definition: wavdec.c:58
GLsizei count
Definition: opengl_enc.c:108
const AVCodecTag ff_codec_wav_tags[]
Definition: riff.c:500
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare two timestamps each in its own time base.
Definition: mathematics.c:147
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3986
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:641
AVInputFormat ff_wav_demuxer
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:449
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
int block_align
Audio only.
Definition: avcodec.h:4085
#define DEC
Definition: librsvgdec.c:105
int seekable
A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
Definition: avio.h:260
int ff_alloc_extradata(AVCodecParameters *par, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0...
Definition: utils.c:3321
#define FFMIN(a, b)
Definition: common.h:96
int smv_last_stream
Definition: wavdec.c:53
int av_get_exact_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1445
#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
const uint8_t ff_w64_guid_data[16]
Definition: w64.c:42
internal header for RIFF based (de)muxers do NOT include this in end user applications ...
int32_t
const uint8_t ff_w64_guid_riff[16]
Definition: w64.c:23
#define s(width, name)
Definition: cbs_vp9.c:257
int audio_eof
Definition: wavdec.c:55
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:52
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
#define AVIO_SEEKABLE_NORMAL
Seeking works like for a local file.
Definition: avio.h:40
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2]...the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so...,+,-,+,-,+,+,-,+,-,+,...hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32-hcoeff[1]-hcoeff[2]-...a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2}an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||.........intra?||||:Block01:yes no||||:Block02:.................||||:Block03::y DC::ref index:||||:Block04::cb DC::motion x:||||.........:cr DC::motion y:||||.................|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------------------------------|||Y subbands||Cb subbands||Cr subbands||||------||------||------|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||------||------||------||||------||------||------|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||------||------||------||||------||------||------|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||------||------||------||||------||------||------|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------------------------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction------------|\Dequantization-------------------\||Reference frames|\IDWT|--------------|Motion\|||Frame 0||Frame 1||Compensation.OBMC v-------|--------------|--------------.\------> Frame n output Frame Frame<----------------------------------/|...|-------------------Range Coder:============Binary Range Coder:-------------------The implemented range coder is an adapted version based upon"Range encoding: an algorithm for removing redundancy from a digitised message."by G.N.N.Martin.The symbols encoded by the Snow range coder are bits(0|1).The associated probabilities are not fix but change depending on the symbol mix seen so far.bit seen|new state---------+-----------------------------------------------0|256-state_transition_table[256-old_state];1|state_transition_table[old_state];state_transition_table={0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:-------------------------FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1.the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:206
void * buf
Definition: avisynth_c.h:766
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
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
int64_t smv_data_ofs
Definition: wavdec.c:49
#define snprintf
Definition: snprintf.h:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:456
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:585
#define flags(name, subs,...)
Definition: cbs_av1.c:561
const uint8_t ff_w64_guid_fmt[16]
Definition: w64.c:33
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size)
Ensures that the requested seekback buffer size will be available.
Definition: aviobuf.c:1054
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
int smv_given_first
Definition: wavdec.c:59
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
Main libavformat public API header.
#define FF_PRI_GUID
Definition: riff.h:101
int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)
Allocate extradata with additional AV_INPUT_BUFFER_PADDING_SIZE at end which is always set to 0 and f...
Definition: utils.c:3339
int64_t data_end
Definition: wavdec.c:47
#define av_free(p)
void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *magic, ID3v2ExtraMeta **extra_meta)
Read an ID3v2 tag into specified dictionary and retrieve supported extra metadata.
Definition: id3v2.c:1115
int smv_block
Definition: wavdec.c:52
int len
void * priv_data
Format private data.
Definition: avformat.h:1386
const uint8_t ff_w64_guid_summarylist[16]
Definition: w64.c:47
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: avcodec.h:4010
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3982
int channels
Audio only.
Definition: avcodec.h:4074
#define av_uninit(x)
Definition: attributes.h:148
AVInputFormat ff_w64_demuxer
Filter the word “frame” indicates either a video frame or a group of audio samples
#define av_freep(p)
void INT64 start
Definition: avisynth_c.h:766
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_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3972
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:764
int stream_index
Definition: avcodec.h:1482
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
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 MKTAG(a, b, c, d)
Definition: common.h:366
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1139
This structure stores compressed data.
Definition: avcodec.h:1457
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:780
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
int unaligned
Definition: wavdec.c:60
#define AV_WL32(p, v)
Definition: intreadwrite.h:426