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)) < 0)
238  return ret;
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)) < 0)
308  return ret;
309 
310  coding_history[size] = 0;
311  if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
313  return ret;
314  }
315 
316  return 0;
317 }
318 
319 static const AVMetadataConv wav_metadata_conv[] = {
320  { "description", "comment" },
321  { "originator", "encoded_by" },
322  { "origination_date", "date" },
323  { "origination_time", "creation_time" },
324  { 0 },
325 };
326 
327 /* wav input */
328 static int wav_read_header(AVFormatContext *s)
329 {
330  int64_t size, av_uninit(data_size);
331  int64_t sample_count = 0;
332  int rf64 = 0;
333  uint32_t tag;
334  AVIOContext *pb = s->pb;
335  AVStream *st = NULL;
336  WAVDemuxContext *wav = s->priv_data;
337  int ret, got_fmt = 0, got_xma2 = 0;
338  int64_t next_tag_ofs, data_ofs = -1;
339 
340  wav->unaligned = avio_tell(s->pb) & 1;
341 
342  wav->smv_data_ofs = -1;
343 
344  /* read chunk ID */
345  tag = avio_rl32(pb);
346  switch (tag) {
347  case MKTAG('R', 'I', 'F', 'F'):
348  break;
349  case MKTAG('R', 'I', 'F', 'X'):
350  wav->rifx = 1;
351  break;
352  case MKTAG('R', 'F', '6', '4'):
353  rf64 = 1;
354  break;
355  default:
356  av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
357  av_fourcc2str(tag));
358  return AVERROR_INVALIDDATA;
359  }
360 
361  /* read chunk size */
362  avio_rl32(pb);
363 
364  /* read format */
365  if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
366  av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
367  return AVERROR_INVALIDDATA;
368  }
369 
370  if (rf64) {
371  if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
372  return AVERROR_INVALIDDATA;
373  size = avio_rl32(pb);
374  if (size < 24)
375  return AVERROR_INVALIDDATA;
376  avio_rl64(pb); /* RIFF size */
377 
378  data_size = avio_rl64(pb);
379  sample_count = avio_rl64(pb);
380 
381  if (data_size < 0 || sample_count < 0) {
382  av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
383  "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
384  data_size, sample_count);
385  return AVERROR_INVALIDDATA;
386  }
387  avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
388 
389  }
390 
391  for (;;) {
392  AVStream *vst;
393  size = next_tag(pb, &tag, wav->rifx);
394  next_tag_ofs = avio_tell(pb) + size;
395 
396  if (avio_feof(pb))
397  break;
398 
399  switch (tag) {
400  case MKTAG('f', 'm', 't', ' '):
401  /* only parse the first 'fmt ' tag found */
402  if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
403  return ret;
404  } else if (got_fmt)
405  av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
406 
407  got_fmt = 1;
408  break;
409  case MKTAG('X', 'M', 'A', '2'):
410  /* only parse the first 'XMA2' tag found */
411  if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, &st)) < 0) {
412  return ret;
413  } else if (got_xma2)
414  av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
415 
416  got_xma2 = 1;
417  break;
418  case MKTAG('d', 'a', 't', 'a'):
419  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) && !got_fmt && !got_xma2) {
420  av_log(s, AV_LOG_ERROR,
421  "found no 'fmt ' tag before the 'data' tag\n");
422  return AVERROR_INVALIDDATA;
423  }
424 
425  if (rf64) {
426  next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
427  } else if (size != 0xFFFFFFFF) {
428  data_size = size;
429  next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
430  } else {
431  av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
432  "file may be invalid\n");
433  data_size = 0;
434  next_tag_ofs = wav->data_end = INT64_MAX;
435  }
436 
437  data_ofs = avio_tell(pb);
438 
439  /* don't look for footer metadata if we can't seek or if we don't
440  * know where the data tag ends
441  */
442  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || (!rf64 && !size))
443  goto break_loop;
444  break;
445  case MKTAG('f', 'a', 'c', 't'):
446  if (!sample_count)
447  sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
448  break;
449  case MKTAG('b', 'e', 'x', 't'):
450  if ((ret = wav_parse_bext_tag(s, size)) < 0)
451  return ret;
452  break;
453  case MKTAG('S','M','V','0'):
454  if (!got_fmt) {
455  av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
456  return AVERROR_INVALIDDATA;
457  }
458  // SMV file, a wav file with video appended.
459  if (size != MKTAG('0','2','0','0')) {
460  av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
461  goto break_loop;
462  }
463  av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
464  wav->smv_given_first = 0;
465  vst = avformat_new_stream(s, NULL);
466  if (!vst)
467  return AVERROR(ENOMEM);
468  avio_r8(pb);
469  vst->id = 1;
472  vst->codecpar->width = avio_rl24(pb);
473  vst->codecpar->height = avio_rl24(pb);
474  if (ff_alloc_extradata(vst->codecpar, 4)) {
475  av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
476  return AVERROR(ENOMEM);
477  }
478  size = avio_rl24(pb);
479  wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
480  avio_rl24(pb);
481  wav->smv_block_size = avio_rl24(pb);
482  avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
483  vst->duration = avio_rl24(pb);
484  avio_rl24(pb);
485  avio_rl24(pb);
486  wav->smv_frames_per_jpeg = avio_rl24(pb);
487  if (wav->smv_frames_per_jpeg > 65536) {
488  av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
489  return AVERROR_INVALIDDATA;
490  }
492  wav->smv_cur_pt = 0;
493  goto break_loop;
494  case MKTAG('L', 'I', 'S', 'T'):
495  if (size < 4) {
496  av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
497  return AVERROR_INVALIDDATA;
498  }
499  switch (avio_rl32(pb)) {
500  case MKTAG('I', 'N', 'F', 'O'):
501  ff_read_riff_info(s, size - 4);
502  }
503  break;
504  case MKTAG('I', 'D', '3', ' '):
505  case MKTAG('i', 'd', '3', ' '): {
506  ID3v2ExtraMeta *id3v2_extra_meta = NULL;
507  ff_id3v2_read_dict(pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
508  if (id3v2_extra_meta) {
509  ff_id3v2_parse_apic(s, &id3v2_extra_meta);
510  ff_id3v2_parse_chapters(s, &id3v2_extra_meta);
511  ff_id3v2_parse_priv(s, &id3v2_extra_meta);
512  }
513  ff_id3v2_free_extra_meta(&id3v2_extra_meta);
514  }
515  break;
516  }
517 
518  /* seek to next tag unless we know that we'll run into EOF */
519  if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
520  wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
521  break;
522  }
523  }
524 
525 break_loop:
526  if (!got_fmt && !got_xma2) {
527  av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
528  return AVERROR_INVALIDDATA;
529  }
530 
531  if (data_ofs < 0) {
532  av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
533  return AVERROR_INVALIDDATA;
534  }
535 
536  avio_seek(pb, data_ofs, SEEK_SET);
537 
538  if (data_size > (INT64_MAX>>3)) {
539  av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
540  data_size = 0;
541  }
542 
543  if ( st->codecpar->bit_rate > 0 && data_size > 0
544  && st->codecpar->sample_rate > 0
545  && sample_count > 0 && st->codecpar->channels > 1
546  && sample_count % st->codecpar->channels == 0) {
547  if (fabs(8.0 * data_size * st->codecpar->channels * st->codecpar->sample_rate /
548  sample_count /st->codecpar->bit_rate - 1.0) < 0.3)
549  sample_count /= st->codecpar->channels;
550  }
551 
552  if ( data_size > 0 && sample_count && st->codecpar->channels
553  && (data_size << 3) / sample_count / st->codecpar->channels > st->codecpar->bits_per_coded_sample + 1) {
554  av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
555  sample_count = 0;
556  }
557 
558  /* G.729 hack (for Ticket4577)
559  * FIXME: Come up with cleaner, more general solution */
560  if (st->codecpar->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
561  av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
562  sample_count = 0;
563  }
564 
565  if (!sample_count || av_get_exact_bits_per_sample(st->codecpar->codec_id) > 0)
566  if ( st->codecpar->channels
567  && data_size
569  && wav->data_end <= avio_size(pb))
570  sample_count = (data_size << 3)
571  /
572  (st->codecpar->channels * (uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));
573 
574  if (sample_count)
575  st->duration = sample_count;
576 
578  st->codecpar->block_align == st->codecpar->channels * 4 &&
579  st->codecpar->bits_per_coded_sample == 32 &&
580  st->codecpar->extradata_size == 2 &&
581  AV_RL16(st->codecpar->extradata) == 1) {
584  } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE &&
585  st->codecpar->block_align == st->codecpar->channels * 4 &&
586  st->codecpar->bits_per_coded_sample == 24) {
588  } else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
590  st->codecpar->block_align = 2048;
591  }
592 
593  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
595 
596  set_spdif(s, wav);
597 
598  return 0;
599 }
600 
601 /**
602  * Find chunk with w64 GUID by skipping over other chunks.
603  * @return the size of the found chunk
604  */
605 static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
606 {
607  uint8_t guid[16];
608  int64_t size;
609 
610  while (!avio_feof(pb)) {
611  avio_read(pb, guid, 16);
612  size = avio_rl64(pb);
613  if (size <= 24)
614  return AVERROR_INVALIDDATA;
615  if (!memcmp(guid, guid1, 16))
616  return size;
617  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
618  }
619  return AVERROR_EOF;
620 }
621 
622 #define MAX_SIZE 4096
623 
624 static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
625 {
626  int ret, size;
627  int64_t left;
628  AVStream *st;
629  WAVDemuxContext *wav = s->priv_data;
630 
631  if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
632  return ff_spdif_read_packet(s, pkt);
633 
634  if (wav->smv_data_ofs > 0) {
635  int64_t audio_dts, video_dts;
636 smv_retry:
637  audio_dts = (int32_t)s->streams[0]->cur_dts;
638  video_dts = (int32_t)s->streams[1]->cur_dts;
639 
640  if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
641  /*We always return a video frame first to get the pixel format first*/
642  wav->smv_last_stream = wav->smv_given_first ?
643  av_compare_ts(video_dts, s->streams[1]->time_base,
644  audio_dts, s->streams[0]->time_base) > 0 : 0;
645  wav->smv_given_first = 1;
646  }
647  wav->smv_last_stream = !wav->smv_last_stream;
648  wav->smv_last_stream |= wav->audio_eof;
649  wav->smv_last_stream &= !wav->smv_eof;
650  if (wav->smv_last_stream) {
651  uint64_t old_pos = avio_tell(s->pb);
652  uint64_t new_pos = wav->smv_data_ofs +
653  wav->smv_block * wav->smv_block_size;
654  if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
655  ret = AVERROR_EOF;
656  goto smv_out;
657  }
658  size = avio_rl24(s->pb);
659  ret = av_get_packet(s->pb, pkt, size);
660  if (ret < 0)
661  goto smv_out;
662  pkt->pos -= 3;
663  pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
664  wav->smv_cur_pt++;
665  if (wav->smv_frames_per_jpeg > 0)
666  wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
667  if (!wav->smv_cur_pt)
668  wav->smv_block++;
669 
670  pkt->stream_index = 1;
671 smv_out:
672  avio_seek(s->pb, old_pos, SEEK_SET);
673  if (ret == AVERROR_EOF) {
674  wav->smv_eof = 1;
675  goto smv_retry;
676  }
677  return ret;
678  }
679  }
680 
681  st = s->streams[0];
682 
683  left = wav->data_end - avio_tell(s->pb);
684  if (wav->ignore_length)
685  left = INT_MAX;
686  if (left <= 0) {
687  if (CONFIG_W64_DEMUXER && wav->w64)
688  left = find_guid(s->pb, ff_w64_guid_data) - 24;
689  else
690  left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
691  if (left < 0) {
692  wav->audio_eof = 1;
693  if (wav->smv_data_ofs > 0 && !wav->smv_eof)
694  goto smv_retry;
695  return AVERROR_EOF;
696  }
697  wav->data_end = avio_tell(s->pb) + left;
698  }
699 
700  size = MAX_SIZE;
701  if (st->codecpar->block_align > 1) {
702  if (size < st->codecpar->block_align)
703  size = st->codecpar->block_align;
704  size = (size / st->codecpar->block_align) * st->codecpar->block_align;
705  }
706  size = FFMIN(size, left);
707  ret = av_get_packet(s->pb, pkt, size);
708  if (ret < 0)
709  return ret;
710  pkt->stream_index = 0;
711 
712  return ret;
713 }
714 
715 static int wav_read_seek(AVFormatContext *s,
716  int stream_index, int64_t timestamp, int flags)
717 {
718  WAVDemuxContext *wav = s->priv_data;
719  AVStream *st;
720  wav->smv_eof = 0;
721  wav->audio_eof = 0;
722  if (wav->smv_data_ofs > 0) {
723  int64_t smv_timestamp = timestamp;
724  if (stream_index == 0)
725  smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
726  else
727  timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
728  if (wav->smv_frames_per_jpeg > 0) {
729  wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
730  wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
731  }
732  }
733 
734  st = s->streams[0];
735  switch (st->codecpar->codec_id) {
736  case AV_CODEC_ID_MP2:
737  case AV_CODEC_ID_MP3:
738  case AV_CODEC_ID_AC3:
739  case AV_CODEC_ID_DTS:
740  case AV_CODEC_ID_XMA2:
741  /* use generic seeking with dynamically generated indexes */
742  return -1;
743  default:
744  break;
745  }
746  return ff_pcm_read_seek(s, stream_index, timestamp, flags);
747 }
748 
749 #define OFFSET(x) offsetof(WAVDemuxContext, x)
750 #define DEC AV_OPT_FLAG_DECODING_PARAM
751 static const AVOption demux_options[] = {
752  { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
753  { NULL },
754 };
755 
756 static const AVClass wav_demuxer_class = {
757  .class_name = "WAV demuxer",
758  .item_name = av_default_item_name,
759  .option = demux_options,
760  .version = LIBAVUTIL_VERSION_INT,
761 };
763  .name = "wav",
764  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
765  .priv_data_size = sizeof(WAVDemuxContext),
766  .read_probe = wav_probe,
767  .read_header = wav_read_header,
768  .read_packet = wav_read_packet,
769  .read_seek = wav_read_seek,
771  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
772  .priv_class = &wav_demuxer_class,
773 };
774 #endif /* CONFIG_WAV_DEMUXER */
775 
776 #if CONFIG_W64_DEMUXER
777 static int w64_probe(const AVProbeData *p)
778 {
779  if (p->buf_size <= 40)
780  return 0;
781  if (!memcmp(p->buf, ff_w64_guid_riff, 16) &&
782  !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
783  return AVPROBE_SCORE_MAX;
784  else
785  return 0;
786 }
787 
788 static int w64_read_header(AVFormatContext *s)
789 {
790  int64_t size, data_ofs = 0;
791  AVIOContext *pb = s->pb;
792  WAVDemuxContext *wav = s->priv_data;
793  AVStream *st;
794  uint8_t guid[16];
795  int ret;
796 
797  avio_read(pb, guid, 16);
798  if (memcmp(guid, ff_w64_guid_riff, 16))
799  return AVERROR_INVALIDDATA;
800 
801  /* riff + wave + fmt + sizes */
802  if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
803  return AVERROR_INVALIDDATA;
804 
805  avio_read(pb, guid, 16);
806  if (memcmp(guid, ff_w64_guid_wave, 16)) {
807  av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
808  return AVERROR_INVALIDDATA;
809  }
810 
811  wav->w64 = 1;
812 
813  st = avformat_new_stream(s, NULL);
814  if (!st)
815  return AVERROR(ENOMEM);
816 
817  while (!avio_feof(pb)) {
818  if (avio_read(pb, guid, 16) != 16)
819  break;
820  size = avio_rl64(pb);
821  if (size <= 24 || INT64_MAX - size < avio_tell(pb))
822  return AVERROR_INVALIDDATA;
823 
824  if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
825  /* subtract chunk header size - normal wav file doesn't count it */
826  ret = ff_get_wav_header(s, pb, st->codecpar, size - 24, 0);
827  if (ret < 0)
828  return ret;
829  avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
830 
831  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
832  } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
833  int64_t samples;
834 
835  samples = avio_rl64(pb);
836  if (samples > 0)
837  st->duration = samples;
838  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 32);
839  } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
840  wav->data_end = avio_tell(pb) + size - 24;
841 
842  data_ofs = avio_tell(pb);
843  if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
844  break;
845 
846  avio_skip(pb, size - 24);
847  } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
848  int64_t start, end, cur;
849  uint32_t count, chunk_size, i;
850 
851  start = avio_tell(pb);
852  end = start + FFALIGN(size, INT64_C(8)) - 24;
853  count = avio_rl32(pb);
854 
855  for (i = 0; i < count; i++) {
856  char chunk_key[5], *value;
857 
858  if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
859  break;
860 
861  chunk_key[4] = 0;
862  avio_read(pb, chunk_key, 4);
863  chunk_size = avio_rl32(pb);
864  if (chunk_size == UINT32_MAX)
865  return AVERROR_INVALIDDATA;
866 
867  value = av_mallocz(chunk_size + 1);
868  if (!value)
869  return AVERROR(ENOMEM);
870 
871  ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
872  avio_skip(pb, chunk_size - ret);
873 
874  av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
875  }
876 
877  avio_skip(pb, end - avio_tell(pb));
878  } else {
879  av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
880  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
881  }
882  }
883 
884  if (!data_ofs)
885  return AVERROR_EOF;
886 
887  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
889 
890  handle_stream_probing(st);
892 
893  avio_seek(pb, data_ofs, SEEK_SET);
894 
895  set_spdif(s, wav);
896 
897  return 0;
898 }
899 
901  .name = "w64",
902  .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
903  .priv_data_size = sizeof(WAVDemuxContext),
904  .read_probe = w64_probe,
905  .read_header = w64_read_header,
906  .read_packet = wav_read_packet,
907  .read_seek = wav_read_seek,
909  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
910 };
911 #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:336
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:1497
else temp
Definition: vf_mcdeint.c:256
#define FF_ARG_GUID(g)
Definition: riff.h:103
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:4882
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:3953
#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:331
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:4019
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:801
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:4455
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
uint32_t tag
Definition: movenc.c:1496
#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:922
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:648
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:3982
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:260
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:1506
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#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:565
#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:3949
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:493
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:3971
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:639
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:4070
#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:3287
#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:1423
#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:577
#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:1052
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:930
int sample_rate
Audio only.
Definition: avcodec.h:4063
#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:754
Main libavformat public API header.
#define FF_PRI_GUID
Definition: riff.h:99
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:3305
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:3995
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3967
int channels
Audio only.
Definition: avcodec.h:4059
#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:358
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: avcodec.h:3957
unsigned int avio_rl24(AVIOContext *s)
Definition: aviobuf.c:762
int stream_index
Definition: avcodec.h:1479
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:1454
uint64_t avio_rl64(AVIOContext *s)
Definition: aviobuf.c:778
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470
#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