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, ret;
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  if ((ret = ff_get_extradata(s, (*st)->codecpar, pb, size)) < 0)
224  return ret;
225 
226  return 0;
227 }
228 
229 static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
230  int length)
231 {
232  char temp[257];
233  int ret;
234 
235  av_assert0(length < sizeof(temp));
236  if ((ret = avio_read(s->pb, temp, length)) != length)
237  return ret < 0 ? ret : AVERROR_INVALIDDATA;
238 
239  temp[length] = 0;
240 
241  if (strlen(temp))
242  return av_dict_set(&s->metadata, key, temp, 0);
243 
244  return 0;
245 }
246 
247 static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
248 {
249  char temp[131], *coding_history;
250  int ret, x;
251  uint64_t time_reference;
252  int64_t umid_parts[8], umid_mask = 0;
253 
254  if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
255  (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
256  (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
257  (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
258  (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
259  return ret;
260 
261  time_reference = avio_rl64(s->pb);
262  snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
263  if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
264  return ret;
265 
266  /* check if version is >= 1, in which case an UMID may be present */
267  if (avio_rl16(s->pb) >= 1) {
268  for (x = 0; x < 8; x++)
269  umid_mask |= umid_parts[x] = avio_rb64(s->pb);
270 
271  if (umid_mask) {
272  /* the string formatting below is per SMPTE 330M-2004 Annex C */
273  if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
274  umid_parts[6] == 0 && umid_parts[7] == 0) {
275  /* basic UMID */
276  snprintf(temp, sizeof(temp),
277  "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
278  umid_parts[0], umid_parts[1],
279  umid_parts[2], umid_parts[3]);
280  } else {
281  /* extended UMID */
282  snprintf(temp, sizeof(temp),
283  "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
284  "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
285  umid_parts[0], umid_parts[1],
286  umid_parts[2], umid_parts[3],
287  umid_parts[4], umid_parts[5],
288  umid_parts[6], umid_parts[7]);
289  }
290 
291  if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
292  return ret;
293  }
294 
295  avio_skip(s->pb, 190);
296  } else
297  avio_skip(s->pb, 254);
298 
299  if (size > 602) {
300  /* CodingHistory present */
301  size -= 602;
302 
303  if (!(coding_history = av_malloc(size + 1)))
304  return AVERROR(ENOMEM);
305 
306  if ((ret = avio_read(s->pb, coding_history, size)) != size) {
307  av_free(coding_history);
308  return ret < 0 ? ret : AVERROR_INVALIDDATA;
309  }
310 
311  coding_history[size] = 0;
312  if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
314  return ret;
315  }
316 
317  return 0;
318 }
319 
320 static const AVMetadataConv wav_metadata_conv[] = {
321  { "description", "comment" },
322  { "originator", "encoded_by" },
323  { "origination_date", "date" },
324  { "origination_time", "creation_time" },
325  { 0 },
326 };
327 
328 /* wav input */
329 static int wav_read_header(AVFormatContext *s)
330 {
331  int64_t size, av_uninit(data_size);
332  int64_t sample_count = 0;
333  int rf64 = 0;
334  uint32_t tag;
335  AVIOContext *pb = s->pb;
336  AVStream *st = NULL;
337  WAVDemuxContext *wav = s->priv_data;
338  int ret, got_fmt = 0, got_xma2 = 0;
339  int64_t next_tag_ofs, data_ofs = -1;
340 
341  wav->unaligned = avio_tell(s->pb) & 1;
342 
343  wav->smv_data_ofs = -1;
344 
345  /* read chunk ID */
346  tag = avio_rl32(pb);
347  switch (tag) {
348  case MKTAG('R', 'I', 'F', 'F'):
349  break;
350  case MKTAG('R', 'I', 'F', 'X'):
351  wav->rifx = 1;
352  break;
353  case MKTAG('R', 'F', '6', '4'):
354  rf64 = 1;
355  break;
356  default:
357  av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
358  av_fourcc2str(tag));
359  return AVERROR_INVALIDDATA;
360  }
361 
362  /* read chunk size */
363  avio_rl32(pb);
364 
365  /* read format */
366  if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
367  av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
368  return AVERROR_INVALIDDATA;
369  }
370 
371  if (rf64) {
372  if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
373  return AVERROR_INVALIDDATA;
374  size = avio_rl32(pb);
375  if (size < 24)
376  return AVERROR_INVALIDDATA;
377  avio_rl64(pb); /* RIFF size */
378 
379  data_size = avio_rl64(pb);
380  sample_count = avio_rl64(pb);
381 
382  if (data_size < 0 || sample_count < 0) {
383  av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
384  "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
385  data_size, sample_count);
386  return AVERROR_INVALIDDATA;
387  }
388  avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
389 
390  }
391 
392  for (;;) {
393  AVStream *vst;
394  size = next_tag(pb, &tag, wav->rifx);
395  next_tag_ofs = avio_tell(pb) + size;
396 
397  if (avio_feof(pb))
398  break;
399 
400  switch (tag) {
401  case MKTAG('f', 'm', 't', ' '):
402  /* only parse the first 'fmt ' tag found */
403  if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
404  return ret;
405  } else if (got_fmt)
406  av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
407 
408  got_fmt = 1;
409  break;
410  case MKTAG('X', 'M', 'A', '2'):
411  /* only parse the first 'XMA2' tag found */
412  if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, &st)) < 0) {
413  return ret;
414  } else if (got_xma2)
415  av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
416 
417  got_xma2 = 1;
418  break;
419  case MKTAG('d', 'a', 't', 'a'):
420  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) && !got_fmt && !got_xma2) {
421  av_log(s, AV_LOG_ERROR,
422  "found no 'fmt ' tag before the 'data' tag\n");
423  return AVERROR_INVALIDDATA;
424  }
425 
426  if (rf64) {
427  next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
428  } else if (size != 0xFFFFFFFF) {
429  data_size = size;
430  next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
431  } else {
432  av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
433  "file may be invalid\n");
434  data_size = 0;
435  next_tag_ofs = wav->data_end = INT64_MAX;
436  }
437 
438  data_ofs = avio_tell(pb);
439 
440  /* don't look for footer metadata if we can't seek or if we don't
441  * know where the data tag ends
442  */
443  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || (!rf64 && !size))
444  goto break_loop;
445  break;
446  case MKTAG('f', 'a', 'c', 't'):
447  if (!sample_count)
448  sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
449  break;
450  case MKTAG('b', 'e', 'x', 't'):
451  if ((ret = wav_parse_bext_tag(s, size)) < 0)
452  return ret;
453  break;
454  case MKTAG('S','M','V','0'):
455  if (!got_fmt) {
456  av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
457  return AVERROR_INVALIDDATA;
458  }
459  // SMV file, a wav file with video appended.
460  if (size != MKTAG('0','2','0','0')) {
461  av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
462  goto break_loop;
463  }
464  av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
465  wav->smv_given_first = 0;
466  vst = avformat_new_stream(s, NULL);
467  if (!vst)
468  return AVERROR(ENOMEM);
469  avio_r8(pb);
470  vst->id = 1;
473  vst->codecpar->width = avio_rl24(pb);
474  vst->codecpar->height = avio_rl24(pb);
475  if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0) {
476  av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
477  return ret;
478  }
479  size = avio_rl24(pb);
480  wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
481  avio_rl24(pb);
482  wav->smv_block_size = avio_rl24(pb);
483  avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
484  vst->duration = avio_rl24(pb);
485  avio_rl24(pb);
486  avio_rl24(pb);
487  wav->smv_frames_per_jpeg = avio_rl24(pb);
488  if (wav->smv_frames_per_jpeg > 65536) {
489  av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
490  return AVERROR_INVALIDDATA;
491  }
493  wav->smv_cur_pt = 0;
494  goto break_loop;
495  case MKTAG('L', 'I', 'S', 'T'):
496  if (size < 4) {
497  av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
498  return AVERROR_INVALIDDATA;
499  }
500  switch (avio_rl32(pb)) {
501  case MKTAG('I', 'N', 'F', 'O'):
502  ff_read_riff_info(s, size - 4);
503  }
504  break;
505  case MKTAG('I', 'D', '3', ' '):
506  case MKTAG('i', 'd', '3', ' '): {
507  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
508  ff_id3v2_read_dict(pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
509  if (id3v2_extra_meta) {
510  ff_id3v2_parse_apic(s, id3v2_extra_meta);
511  ff_id3v2_parse_chapters(s, id3v2_extra_meta);
512  ff_id3v2_parse_priv(s, id3v2_extra_meta);
513  }
514  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
515  }
516  break;
517  }
518 
519  /* seek to next tag unless we know that we'll run into EOF */
520  if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
521  wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
522  break;
523  }
524  }
525 
526 break_loop:
527  if (!got_fmt && !got_xma2) {
528  av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
529  return AVERROR_INVALIDDATA;
530  }
531 
532  if (data_ofs < 0) {
533  av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
534  return AVERROR_INVALIDDATA;
535  }
536 
537  avio_seek(pb, data_ofs, SEEK_SET);
538 
539  if (data_size > (INT64_MAX>>3)) {
540  av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
541  data_size = 0;
542  }
543 
544  if ( st->codecpar->bit_rate > 0 && data_size > 0
545  && st->codecpar->sample_rate > 0
546  && sample_count > 0 && st->codecpar->channels > 1
547  && sample_count % st->codecpar->channels == 0) {
548  if (fabs(8.0 * data_size * st->codecpar->channels * st->codecpar->sample_rate /
549  sample_count /st->codecpar->bit_rate - 1.0) < 0.3)
550  sample_count /= st->codecpar->channels;
551  }
552 
553  if ( data_size > 0 && sample_count && st->codecpar->channels
554  && (data_size << 3) / sample_count / st->codecpar->channels > st->codecpar->bits_per_coded_sample + 1) {
555  av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
556  sample_count = 0;
557  }
558 
559  /* G.729 hack (for Ticket4577)
560  * FIXME: Come up with cleaner, more general solution */
561  if (st->codecpar->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
562  av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
563  sample_count = 0;
564  }
565 
566  if (!sample_count || av_get_exact_bits_per_sample(st->codecpar->codec_id) > 0)
567  if ( st->codecpar->channels
568  && data_size
570  && wav->data_end <= avio_size(pb))
571  sample_count = (data_size << 3)
572  /
573  (st->codecpar->channels * (uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));
574 
575  if (sample_count)
576  st->duration = sample_count;
577 
579  st->codecpar->block_align == st->codecpar->channels * 4 &&
580  st->codecpar->bits_per_coded_sample == 32 &&
581  st->codecpar->extradata_size == 2 &&
582  AV_RL16(st->codecpar->extradata) == 1) {
585  } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE &&
586  st->codecpar->block_align == st->codecpar->channels * 4 &&
587  st->codecpar->bits_per_coded_sample == 24) {
589  } else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
591  st->codecpar->block_align = 2048;
592  } else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2) {
593  st->codecpar->block_align *= st->codecpar->channels;
594  }
595 
596  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
598 
599  set_spdif(s, wav);
600 
601  return 0;
602 }
603 
604 /**
605  * Find chunk with w64 GUID by skipping over other chunks.
606  * @return the size of the found chunk
607  */
608 static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
609 {
610  uint8_t guid[16];
611  int64_t size;
612 
613  while (!avio_feof(pb)) {
614  avio_read(pb, guid, 16);
615  size = avio_rl64(pb);
616  if (size <= 24)
617  return AVERROR_INVALIDDATA;
618  if (!memcmp(guid, guid1, 16))
619  return size;
620  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
621  }
622  return AVERROR_EOF;
623 }
624 
625 #define MAX_SIZE 4096
626 
627 static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
628 {
629  int ret, size;
630  int64_t left;
631  AVStream *st;
632  WAVDemuxContext *wav = s->priv_data;
633 
634  if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
635  return ff_spdif_read_packet(s, pkt);
636 
637  if (wav->smv_data_ofs > 0) {
638  int64_t audio_dts, video_dts;
639 smv_retry:
640  audio_dts = (int32_t)s->streams[0]->cur_dts;
641  video_dts = (int32_t)s->streams[1]->cur_dts;
642 
643  if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
644  /*We always return a video frame first to get the pixel format first*/
645  wav->smv_last_stream = wav->smv_given_first ?
646  av_compare_ts(video_dts, s->streams[1]->time_base,
647  audio_dts, s->streams[0]->time_base) > 0 : 0;
648  wav->smv_given_first = 1;
649  }
650  wav->smv_last_stream = !wav->smv_last_stream;
651  wav->smv_last_stream |= wav->audio_eof;
652  wav->smv_last_stream &= !wav->smv_eof;
653  if (wav->smv_last_stream) {
654  uint64_t old_pos = avio_tell(s->pb);
655  uint64_t new_pos = wav->smv_data_ofs +
656  wav->smv_block * wav->smv_block_size;
657  if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
658  ret = AVERROR_EOF;
659  goto smv_out;
660  }
661  size = avio_rl24(s->pb);
662  ret = av_get_packet(s->pb, pkt, size);
663  if (ret < 0)
664  goto smv_out;
665  pkt->pos -= 3;
666  pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
667  wav->smv_cur_pt++;
668  if (wav->smv_frames_per_jpeg > 0)
669  wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
670  if (!wav->smv_cur_pt)
671  wav->smv_block++;
672 
673  pkt->stream_index = 1;
674 smv_out:
675  avio_seek(s->pb, old_pos, SEEK_SET);
676  if (ret == AVERROR_EOF) {
677  wav->smv_eof = 1;
678  goto smv_retry;
679  }
680  return ret;
681  }
682  }
683 
684  st = s->streams[0];
685 
686  left = wav->data_end - avio_tell(s->pb);
687  if (wav->ignore_length)
688  left = INT_MAX;
689  if (left <= 0) {
690  if (CONFIG_W64_DEMUXER && wav->w64)
691  left = find_guid(s->pb, ff_w64_guid_data) - 24;
692  else
693  left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
694  if (left < 0) {
695  wav->audio_eof = 1;
696  if (wav->smv_data_ofs > 0 && !wav->smv_eof)
697  goto smv_retry;
698  return AVERROR_EOF;
699  }
700  wav->data_end = avio_tell(s->pb) + left;
701  }
702 
703  size = MAX_SIZE;
704  if (st->codecpar->block_align > 1) {
705  if (size < st->codecpar->block_align)
706  size = st->codecpar->block_align;
707  size = (size / st->codecpar->block_align) * st->codecpar->block_align;
708  }
709  size = FFMIN(size, left);
710  ret = av_get_packet(s->pb, pkt, size);
711  if (ret < 0)
712  return ret;
713  pkt->stream_index = 0;
714 
715  return ret;
716 }
717 
718 static int wav_read_seek(AVFormatContext *s,
719  int stream_index, int64_t timestamp, int flags)
720 {
721  WAVDemuxContext *wav = s->priv_data;
722  AVStream *st;
723  wav->smv_eof = 0;
724  wav->audio_eof = 0;
725  if (wav->smv_data_ofs > 0) {
726  int64_t smv_timestamp = timestamp;
727  if (stream_index == 0)
728  smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
729  else
730  timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
731  if (wav->smv_frames_per_jpeg > 0) {
732  wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
733  wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
734  }
735  }
736 
737  st = s->streams[0];
738  switch (st->codecpar->codec_id) {
739  case AV_CODEC_ID_MP2:
740  case AV_CODEC_ID_MP3:
741  case AV_CODEC_ID_AC3:
742  case AV_CODEC_ID_DTS:
743  case AV_CODEC_ID_XMA2:
744  /* use generic seeking with dynamically generated indexes */
745  return -1;
746  default:
747  break;
748  }
749  return ff_pcm_read_seek(s, stream_index, timestamp, flags);
750 }
751 
752 #define OFFSET(x) offsetof(WAVDemuxContext, x)
753 #define DEC AV_OPT_FLAG_DECODING_PARAM
754 static const AVOption demux_options[] = {
755  { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
756  { NULL },
757 };
758 
759 static const AVClass wav_demuxer_class = {
760  .class_name = "WAV demuxer",
761  .item_name = av_default_item_name,
762  .option = demux_options,
763  .version = LIBAVUTIL_VERSION_INT,
764 };
766  .name = "wav",
767  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
768  .priv_data_size = sizeof(WAVDemuxContext),
769  .read_probe = wav_probe,
770  .read_header = wav_read_header,
771  .read_packet = wav_read_packet,
772  .read_seek = wav_read_seek,
774  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
775  .priv_class = &wav_demuxer_class,
776 };
777 #endif /* CONFIG_WAV_DEMUXER */
778 
779 #if CONFIG_W64_DEMUXER
780 static int w64_probe(const AVProbeData *p)
781 {
782  if (p->buf_size <= 40)
783  return 0;
784  if (!memcmp(p->buf, ff_w64_guid_riff, 16) &&
785  !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
786  return AVPROBE_SCORE_MAX;
787  else
788  return 0;
789 }
790 
791 static int w64_read_header(AVFormatContext *s)
792 {
793  int64_t size, data_ofs = 0;
794  AVIOContext *pb = s->pb;
795  WAVDemuxContext *wav = s->priv_data;
796  AVStream *st;
797  uint8_t guid[16];
798  int ret;
799 
800  avio_read(pb, guid, 16);
801  if (memcmp(guid, ff_w64_guid_riff, 16))
802  return AVERROR_INVALIDDATA;
803 
804  /* riff + wave + fmt + sizes */
805  if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
806  return AVERROR_INVALIDDATA;
807 
808  avio_read(pb, guid, 16);
809  if (memcmp(guid, ff_w64_guid_wave, 16)) {
810  av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
811  return AVERROR_INVALIDDATA;
812  }
813 
814  wav->w64 = 1;
815 
816  st = avformat_new_stream(s, NULL);
817  if (!st)
818  return AVERROR(ENOMEM);
819 
820  while (!avio_feof(pb)) {
821  if (avio_read(pb, guid, 16) != 16)
822  break;
823  size = avio_rl64(pb);
824  if (size <= 24 || INT64_MAX - size < avio_tell(pb))
825  return AVERROR_INVALIDDATA;
826 
827  if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
828  /* subtract chunk header size - normal wav file doesn't count it */
829  ret = ff_get_wav_header(s, pb, st->codecpar, size - 24, 0);
830  if (ret < 0)
831  return ret;
832  avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
833 
834  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
835  } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
836  int64_t samples;
837 
838  samples = avio_rl64(pb);
839  if (samples > 0)
840  st->duration = samples;
841  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 32);
842  } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
843  wav->data_end = avio_tell(pb) + size - 24;
844 
845  data_ofs = avio_tell(pb);
846  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
847  break;
848 
849  avio_skip(pb, size - 24);
850  } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
851  int64_t start, end, cur;
852  uint32_t count, chunk_size, i;
853 
854  start = avio_tell(pb);
855  end = start + FFALIGN(size, INT64_C(8)) - 24;
856  count = avio_rl32(pb);
857 
858  for (i = 0; i < count; i++) {
859  char chunk_key[5], *value;
860 
861  if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
862  break;
863 
864  chunk_key[4] = 0;
865  avio_read(pb, chunk_key, 4);
866  chunk_size = avio_rl32(pb);
867  if (chunk_size == UINT32_MAX)
868  return AVERROR_INVALIDDATA;
869 
870  value = av_mallocz(chunk_size + 1);
871  if (!value)
872  return AVERROR(ENOMEM);
873 
874  ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
875  avio_skip(pb, chunk_size - ret);
876 
877  av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
878  }
879 
880  avio_skip(pb, end - avio_tell(pb));
881  } else {
882  av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
883  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
884  }
885  }
886 
887  if (!data_ofs)
888  return AVERROR_EOF;
889 
890  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
892 
893  handle_stream_probing(st);
895 
896  avio_seek(pb, data_ofs, SEEK_SET);
897 
898  set_spdif(s, wav);
899 
900  return 0;
901 }
902 
904  .name = "w64",
905  .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
906  .priv_data_size = sizeof(WAVDemuxContext),
907  .read_probe = w64_probe,
908  .read_header = w64_read_header,
909  .read_packet = wav_read_packet,
910  .read_seek = wav_read_seek,
912  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
913 };
914 #endif /* CONFIG_W64_DEMUXER */
int ff_read_riff_info(AVFormatContext *s, int64_t size)
Definition: riffdec.c:228
#define NULL
Definition: coverity.c:32
int ff_id3v2_parse_priv(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Add metadata for all PRIV tags in the ID3v2 header.
Definition: id3v2.c:1261
AVDictionary * id3v2_meta
ID3v2 tag useful for MP3 demuxing.
Definition: internal.h:139
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:346
const uint8_t ff_w64_guid_wave[16]
Definition: w64.c:28
Buffered I/O operations.
version
Definition: libkvazaar.c:292
int ff_spdif_probe(const uint8_t *p_buf, int buf_size, enum AVCodecID *codec)
Definition: spdifdec.c:116
AVOption.
Definition: opt.h:248
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:200
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:383
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:4938
int probe_packets
Number of packets to buffer for codec probing.
Definition: avformat.h:1086
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
#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:253
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVFormatInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1804
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:341
static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
Definition: wavdec.c:64
const char * key
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
static AVPacket pkt
#define MAX_SIZE
Definition: vf_unsharp.c:305
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:1351
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:1079
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: codec_par.h:126
AVOptions.
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:790
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:1094
int id
Format-specific stream ID.
Definition: avformat.h:883
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:4519
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
int ff_id3v2_parse_chapters(AVFormatContext *s, ID3v2ExtraMeta *extra_meta)
Create chapters for all CHAP tags found in the ID3v2 header.
Definition: id3v2.c:1170
uint32_t tag
Definition: movenc.c:1532
#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:304
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t avio_rb64(AVIOContext *s)
Definition: aviobuf.c:911
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
channels
Definition: aptx.h:33
#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:799
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:637
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: codec_par.h:89
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
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:46
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
Definition: utils.c:1561
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1591
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:153
unsigned int pos
Definition: spdifenc.c:410
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:215
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:412
#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: codec_par.h:56
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)
Free memory allocated parsing special (non-text) metadata.
Definition: id3v2.c:1114
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:506
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: codec_par.h:78
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:628
AVInputFormat ff_wav_demuxer
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
int block_align
Audio only.
Definition: codec_par.h:177
#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:1477
#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:527
Stream structure.
Definition: avformat.h:876
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:1393
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
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:1130
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:463
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:451
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
const AVMetadataConv ff_riff_info_conv[]
Definition: riff.c:591
#define flags(name, subs,...)
Definition: cbs_av1.c:560
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:994
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:925
int sample_rate
Audio only.
Definition: codec_par.h:170
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
int smv_given_first
Definition: wavdec.c:59
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
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:1102
int smv_block
Definition: wavdec.c:52
int len
void * priv_data
Format private data.
Definition: avformat.h:1379
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: codec_par.h:102
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
int channels
Audio only.
Definition: codec_par.h:166
#define av_uninit(x)
Definition: attributes.h:154
AVInputFormat ff_w64_demuxer
Filter the word “frame” indicates either a video frame or a group of audio samples
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:650
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1023
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:368
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:751
int stream_index
Definition: packet.h:365
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:905
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:406
int request_probe
stream probing state -1 -> probing finished 0 -> no probing requested rest -> perform probing with re...
Definition: avformat.h:1133
This structure stores compressed data.
Definition: packet.h:340
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:767
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:356
int i
Definition: input.c:406
#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