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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 "libavutil/avassert.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/log.h"
30 #include "libavutil/mathematics.h"
31 #include "libavutil/opt.h"
32 #include "avformat.h"
33 #include "avio.h"
34 #include "avio_internal.h"
35 #include "internal.h"
36 #include "metadata.h"
37 #include "pcm.h"
38 #include "riff.h"
39 #include "w64.h"
40 #include "spdif.h"
41 
42 typedef struct WAVDemuxContext {
43  const AVClass *class;
44  int64_t data_end;
45  int w64;
46  int64_t smv_data_ofs;
49  int smv_block;
51  int smv_eof;
52  int audio_eof;
54  int spdif;
57  int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended
59 
60 #if CONFIG_WAV_DEMUXER
61 
62 static int64_t next_tag(AVIOContext *pb, uint32_t *tag)
63 {
64  *tag = avio_rl32(pb);
65  return avio_rl32(pb);
66 }
67 
68 /* RIFF chunks are always at even offsets relative to where they start. */
69 static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)
70 {
71  offset += offset < INT64_MAX && offset + wav->unaligned & 1;
72 
73  return avio_seek(s, offset, whence);
74 }
75 
76 /* return the size of the found tag */
77 static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)
78 {
79  unsigned int tag;
80  int64_t size;
81 
82  for (;;) {
83  if (url_feof(pb))
84  return AVERROR_EOF;
85  size = next_tag(pb, &tag);
86  if (tag == tag1)
87  break;
88  wav_seek_tag(wav, pb, size, SEEK_CUR);
89  }
90  return size;
91 }
92 
93 static int wav_probe(AVProbeData *p)
94 {
95  /* check file header */
96  if (p->buf_size <= 32)
97  return 0;
98  if (!memcmp(p->buf + 8, "WAVE", 4)) {
99  if (!memcmp(p->buf, "RIFF", 4))
100  /* Since the ACT demuxer has a standard WAV header at the top of
101  * its own, the returned score is decreased to avoid a probe
102  * conflict between ACT and WAV. */
103  return AVPROBE_SCORE_MAX - 1;
104  else if (!memcmp(p->buf, "RF64", 4) &&
105  !memcmp(p->buf + 12, "ds64", 4))
106  return AVPROBE_SCORE_MAX;
107  }
108  return 0;
109 }
110 
111 static void handle_stream_probing(AVStream *st)
112 {
113  if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {
115  st->probe_packets = FFMIN(st->probe_packets, 4);
116  }
117 }
118 
119 static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
120 {
121  AVIOContext *pb = s->pb;
122  int ret;
123 
124  /* parse fmt header */
125  *st = avformat_new_stream(s, NULL);
126  if (!*st)
127  return AVERROR(ENOMEM);
128 
129  ret = ff_get_wav_header(pb, (*st)->codec, size);
130  if (ret < 0)
131  return ret;
132  handle_stream_probing(*st);
133 
134  (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
135 
136  avpriv_set_pts_info(*st, 64, 1, (*st)->codec->sample_rate);
137 
138  return 0;
139 }
140 
141 static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
142  int length)
143 {
144  char temp[257];
145  int ret;
146 
147  av_assert0(length <= sizeof(temp));
148  if ((ret = avio_read(s->pb, temp, length)) < 0)
149  return ret;
150 
151  temp[length] = 0;
152 
153  if (strlen(temp))
154  return av_dict_set(&s->metadata, key, temp, 0);
155 
156  return 0;
157 }
158 
159 static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
160 {
161  char temp[131], *coding_history;
162  int ret, x;
163  uint64_t time_reference;
164  int64_t umid_parts[8], umid_mask = 0;
165 
166  if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
167  (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
168  (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
169  (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
170  (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
171  return ret;
172 
173  time_reference = avio_rl64(s->pb);
174  snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
175  if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
176  return ret;
177 
178  /* check if version is >= 1, in which case an UMID may be present */
179  if (avio_rl16(s->pb) >= 1) {
180  for (x = 0; x < 8; x++)
181  umid_mask |= umid_parts[x] = avio_rb64(s->pb);
182 
183  if (umid_mask) {
184  /* the string formatting below is per SMPTE 330M-2004 Annex C */
185  if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
186  umid_parts[6] == 0 && umid_parts[7] == 0) {
187  /* basic UMID */
188  snprintf(temp, sizeof(temp),
189  "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
190  umid_parts[0], umid_parts[1],
191  umid_parts[2], umid_parts[3]);
192  } else {
193  /* extended UMID */
194  snprintf(temp, sizeof(temp),
195  "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
196  "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
197  umid_parts[0], umid_parts[1],
198  umid_parts[2], umid_parts[3],
199  umid_parts[4], umid_parts[5],
200  umid_parts[6], umid_parts[7]);
201  }
202 
203  if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
204  return ret;
205  }
206 
207  avio_skip(s->pb, 190);
208  } else
209  avio_skip(s->pb, 254);
210 
211  if (size > 602) {
212  /* CodingHistory present */
213  size -= 602;
214 
215  if (!(coding_history = av_malloc(size + 1)))
216  return AVERROR(ENOMEM);
217 
218  if ((ret = avio_read(s->pb, coding_history, size)) < 0)
219  return ret;
220 
221  coding_history[size] = 0;
222  if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
224  return ret;
225  }
226 
227  return 0;
228 }
229 
230 static const AVMetadataConv wav_metadata_conv[] = {
231  { "description", "comment" },
232  { "originator", "encoded_by" },
233  { "origination_date", "date" },
234  { "origination_time", "creation_time" },
235  { 0 },
236 };
237 
238 /* wav input */
239 static int wav_read_header(AVFormatContext *s)
240 {
241  int64_t size, av_uninit(data_size);
242  int64_t sample_count = 0;
243  int rf64;
244  uint32_t tag;
245  AVIOContext *pb = s->pb;
246  AVStream *st = NULL;
247  WAVDemuxContext *wav = s->priv_data;
248  int ret, got_fmt = 0;
249  int64_t next_tag_ofs, data_ofs = -1;
250 
251  wav->unaligned = avio_tell(s->pb) & 1;
252 
253  wav->smv_data_ofs = -1;
254 
255  /* check RIFF header */
256  tag = avio_rl32(pb);
257 
258  rf64 = tag == MKTAG('R', 'F', '6', '4');
259  if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))
260  return AVERROR_INVALIDDATA;
261  avio_rl32(pb); /* file size */
262  tag = avio_rl32(pb);
263  if (tag != MKTAG('W', 'A', 'V', 'E'))
264  return AVERROR_INVALIDDATA;
265 
266  if (rf64) {
267  if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
268  return AVERROR_INVALIDDATA;
269  size = avio_rl32(pb);
270  if (size < 24)
271  return AVERROR_INVALIDDATA;
272  avio_rl64(pb); /* RIFF size */
273 
274  data_size = avio_rl64(pb);
275  sample_count = avio_rl64(pb);
276 
277  if (data_size < 0 || sample_count < 0) {
278  av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
279  "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
280  data_size, sample_count);
281  return AVERROR_INVALIDDATA;
282  }
283  avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
284 
285  }
286 
287  for (;;) {
288  AVStream *vst;
289  size = next_tag(pb, &tag);
290  next_tag_ofs = avio_tell(pb) + size;
291 
292  if (url_feof(pb))
293  break;
294 
295  switch (tag) {
296  case MKTAG('f', 'm', 't', ' '):
297  /* only parse the first 'fmt ' tag found */
298  if (!got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
299  return ret;
300  } else if (got_fmt)
301  av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
302 
303  got_fmt = 1;
304  break;
305  case MKTAG('d', 'a', 't', 'a'):
306  if (!got_fmt) {
307  av_log(s, AV_LOG_ERROR,
308  "found no 'fmt ' tag before the 'data' tag\n");
309  return AVERROR_INVALIDDATA;
310  }
311 
312  if (rf64) {
313  next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
314  } else {
315  data_size = size;
316  next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
317  }
318 
319  data_ofs = avio_tell(pb);
320 
321  /* don't look for footer metadata if we can't seek or if we don't
322  * know where the data tag ends
323  */
324  if (!pb->seekable || (!rf64 && !size))
325  goto break_loop;
326  break;
327  case MKTAG('f', 'a', 'c', 't'):
328  if (!sample_count)
329  sample_count = avio_rl32(pb);
330  break;
331  case MKTAG('b', 'e', 'x', 't'):
332  if ((ret = wav_parse_bext_tag(s, size)) < 0)
333  return ret;
334  break;
335  case MKTAG('S','M','V','0'):
336  if (!got_fmt) {
337  av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
338  return AVERROR_INVALIDDATA;
339  }
340  // SMV file, a wav file with video appended.
341  if (size != MKTAG('0','2','0','0')) {
342  av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
343  goto break_loop;
344  }
345  av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
346  wav->smv_given_first = 0;
347  vst = avformat_new_stream(s, NULL);
348  if (!vst)
349  return AVERROR(ENOMEM);
350  avio_r8(pb);
351  vst->id = 1;
354  vst->codec->width = avio_rl24(pb);
355  vst->codec->height = avio_rl24(pb);
356  if (ff_alloc_extradata(vst->codec, 4)) {
357  av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
358  return AVERROR(ENOMEM);
359  }
360  size = avio_rl24(pb);
361  wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
362  avio_rl24(pb);
363  wav->smv_block_size = avio_rl24(pb);
364  avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
365  vst->duration = avio_rl24(pb);
366  avio_rl24(pb);
367  avio_rl24(pb);
368  wav->smv_frames_per_jpeg = avio_rl24(pb);
369  if (wav->smv_frames_per_jpeg > 65536) {
370  av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
371  return AVERROR_INVALIDDATA;
372  }
374  wav->smv_cur_pt = 0;
375  goto break_loop;
376  case MKTAG('L', 'I', 'S', 'T'):
377  if (size < 4) {
378  av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
379  return AVERROR_INVALIDDATA;
380  }
381  switch (avio_rl32(pb)) {
382  case MKTAG('I', 'N', 'F', 'O'):
383  ff_read_riff_info(s, size - 4);
384  }
385  break;
386  }
387 
388  /* seek to next tag unless we know that we'll run into EOF */
389  if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
390  wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
391  break;
392  }
393  }
394 
395 break_loop:
396  if (data_ofs < 0) {
397  av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
398  return AVERROR_INVALIDDATA;
399  }
400 
401  avio_seek(pb, data_ofs, SEEK_SET);
402 
403  if (!sample_count || av_get_exact_bits_per_sample(st->codec->codec_id) > 0)
404  if ( st->codec->channels
405  && data_size
407  && wav->data_end <= avio_size(pb))
408  sample_count = (data_size << 3)
409  /
410  (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
411 
412  if (sample_count)
413  st->duration = sample_count;
414 
415  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
417 
418  return 0;
419 }
420 
421 /**
422  * Find chunk with w64 GUID by skipping over other chunks.
423  * @return the size of the found chunk
424  */
425 static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
426 {
427  uint8_t guid[16];
428  int64_t size;
429 
430  while (!url_feof(pb)) {
431  avio_read(pb, guid, 16);
432  size = avio_rl64(pb);
433  if (size <= 24)
434  return AVERROR_INVALIDDATA;
435  if (!memcmp(guid, guid1, 16))
436  return size;
437  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
438  }
439  return AVERROR_EOF;
440 }
441 
442 #define MAX_SIZE 4096
443 
444 static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
445 {
446  int ret, size;
447  int64_t left;
448  AVStream *st;
449  WAVDemuxContext *wav = s->priv_data;
450 
451  if (CONFIG_SPDIF_DEMUXER && wav->spdif == 0 &&
452  s->streams[0]->codec->codec_tag == 1) {
453  enum AVCodecID codec;
454  ret = ff_spdif_probe(s->pb->buffer, s->pb->buf_end - s->pb->buffer,
455  &codec);
456  if (ret > AVPROBE_SCORE_EXTENSION) {
457  s->streams[0]->codec->codec_id = codec;
458  wav->spdif = 1;
459  } else {
460  wav->spdif = -1;
461  }
462  }
463  if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
464  return ff_spdif_read_packet(s, pkt);
465 
466  if (wav->smv_data_ofs > 0) {
467  int64_t audio_dts, video_dts;
468 smv_retry:
469  audio_dts = (int32_t)s->streams[0]->cur_dts;
470  video_dts = (int32_t)s->streams[1]->cur_dts;
471 
472  if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
473  /*We always return a video frame first to get the pixel format first*/
474  wav->smv_last_stream = wav->smv_given_first ?
475  av_compare_ts(video_dts, s->streams[1]->time_base,
476  audio_dts, s->streams[0]->time_base) > 0 : 0;
477  wav->smv_given_first = 1;
478  }
479  wav->smv_last_stream = !wav->smv_last_stream;
480  wav->smv_last_stream |= wav->audio_eof;
481  wav->smv_last_stream &= !wav->smv_eof;
482  if (wav->smv_last_stream) {
483  uint64_t old_pos = avio_tell(s->pb);
484  uint64_t new_pos = wav->smv_data_ofs +
485  wav->smv_block * wav->smv_block_size;
486  if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
487  ret = AVERROR_EOF;
488  goto smv_out;
489  }
490  size = avio_rl24(s->pb);
491  ret = av_get_packet(s->pb, pkt, size);
492  if (ret < 0)
493  goto smv_out;
494  pkt->pos -= 3;
495  pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
496  wav->smv_cur_pt++;
497  if (wav->smv_frames_per_jpeg > 0)
498  wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
499  if (!wav->smv_cur_pt)
500  wav->smv_block++;
501 
502  pkt->stream_index = 1;
503 smv_out:
504  avio_seek(s->pb, old_pos, SEEK_SET);
505  if (ret == AVERROR_EOF) {
506  wav->smv_eof = 1;
507  goto smv_retry;
508  }
509  return ret;
510  }
511  }
512 
513  st = s->streams[0];
514 
515  left = wav->data_end - avio_tell(s->pb);
516  if (wav->ignore_length)
517  left = INT_MAX;
518  if (left <= 0) {
519  if (CONFIG_W64_DEMUXER && wav->w64)
520  left = find_guid(s->pb, ff_w64_guid_data) - 24;
521  else
522  left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
523  if (left < 0) {
524  wav->audio_eof = 1;
525  if (wav->smv_data_ofs > 0 && !wav->smv_eof)
526  goto smv_retry;
527  return AVERROR_EOF;
528  }
529  wav->data_end = avio_tell(s->pb) + left;
530  }
531 
532  size = MAX_SIZE;
533  if (st->codec->block_align > 1) {
534  if (size < st->codec->block_align)
535  size = st->codec->block_align;
536  size = (size / st->codec->block_align) * st->codec->block_align;
537  }
538  size = FFMIN(size, left);
539  ret = av_get_packet(s->pb, pkt, size);
540  if (ret < 0)
541  return ret;
542  pkt->stream_index = 0;
543 
544  return ret;
545 }
546 
547 static int wav_read_seek(AVFormatContext *s,
548  int stream_index, int64_t timestamp, int flags)
549 {
550  WAVDemuxContext *wav = s->priv_data;
551  AVStream *st;
552  wav->smv_eof = 0;
553  wav->audio_eof = 0;
554  if (wav->smv_data_ofs > 0) {
555  int64_t smv_timestamp = timestamp;
556  if (stream_index == 0)
557  smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
558  else
559  timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
560  if (wav->smv_frames_per_jpeg > 0) {
561  wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
562  wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
563  }
564  }
565 
566  st = s->streams[0];
567  switch (st->codec->codec_id) {
568  case AV_CODEC_ID_MP2:
569  case AV_CODEC_ID_MP3:
570  case AV_CODEC_ID_AC3:
571  case AV_CODEC_ID_DTS:
572  /* use generic seeking with dynamically generated indexes */
573  return -1;
574  default:
575  break;
576  }
577  return ff_pcm_read_seek(s, stream_index, timestamp, flags);
578 }
579 
580 #define OFFSET(x) offsetof(WAVDemuxContext, x)
581 #define DEC AV_OPT_FLAG_DECODING_PARAM
582 static const AVOption demux_options[] = {
583  { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, DEC },
584  { NULL },
585 };
586 
587 static const AVClass wav_demuxer_class = {
588  .class_name = "WAV demuxer",
589  .item_name = av_default_item_name,
590  .option = demux_options,
591  .version = LIBAVUTIL_VERSION_INT,
592 };
593 AVInputFormat ff_wav_demuxer = {
594  .name = "wav",
595  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
596  .priv_data_size = sizeof(WAVDemuxContext),
597  .read_probe = wav_probe,
598  .read_header = wav_read_header,
599  .read_packet = wav_read_packet,
600  .read_seek = wav_read_seek,
601  .flags = AVFMT_GENERIC_INDEX,
602  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
603  .priv_class = &wav_demuxer_class,
604 };
605 #endif /* CONFIG_WAV_DEMUXER */
606 
607 #if CONFIG_W64_DEMUXER
608 static int w64_probe(AVProbeData *p)
609 {
610  if (p->buf_size <= 40)
611  return 0;
612  if (!memcmp(p->buf, ff_w64_guid_riff, 16) &&
613  !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
614  return AVPROBE_SCORE_MAX;
615  else
616  return 0;
617 }
618 
619 static int w64_read_header(AVFormatContext *s)
620 {
621  int64_t size, data_ofs = 0;
622  AVIOContext *pb = s->pb;
623  WAVDemuxContext *wav = s->priv_data;
624  AVStream *st;
625  uint8_t guid[16];
626  int ret;
627 
628  avio_read(pb, guid, 16);
629  if (memcmp(guid, ff_w64_guid_riff, 16))
630  return AVERROR_INVALIDDATA;
631 
632  /* riff + wave + fmt + sizes */
633  if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
634  return AVERROR_INVALIDDATA;
635 
636  avio_read(pb, guid, 16);
637  if (memcmp(guid, ff_w64_guid_wave, 16)) {
638  av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
639  return AVERROR_INVALIDDATA;
640  }
641 
642  wav->w64 = 1;
643 
644  st = avformat_new_stream(s, NULL);
645  if (!st)
646  return AVERROR(ENOMEM);
647 
648  while (!url_feof(pb)) {
649  if (avio_read(pb, guid, 16) != 16)
650  break;
651  size = avio_rl64(pb);
652  if (size <= 24 || INT64_MAX - size < avio_tell(pb))
653  return AVERROR_INVALIDDATA;
654 
655  if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
656  /* subtract chunk header size - normal wav file doesn't count it */
657  ret = ff_get_wav_header(pb, st->codec, size - 24);
658  if (ret < 0)
659  return ret;
660  avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
661 
662  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
663  } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
664  int64_t samples;
665 
666  samples = avio_rl64(pb);
667  if (samples > 0)
668  st->duration = samples;
669  } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
670  wav->data_end = avio_tell(pb) + size - 24;
671 
672  data_ofs = avio_tell(pb);
673  if (!pb->seekable)
674  break;
675 
676  avio_skip(pb, size - 24);
677  } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
678  int64_t start, end, cur;
679  uint32_t count, chunk_size, i;
680 
681  start = avio_tell(pb);
682  end = start + FFALIGN(size, INT64_C(8)) - 24;
683  count = avio_rl32(pb);
684 
685  for (i = 0; i < count; i++) {
686  char chunk_key[5], *value;
687 
688  if (url_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
689  break;
690 
691  chunk_key[4] = 0;
692  avio_read(pb, chunk_key, 4);
693  chunk_size = avio_rl32(pb);
694 
695  value = av_mallocz(chunk_size + 1);
696  if (!value)
697  return AVERROR(ENOMEM);
698 
699  ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
700  avio_skip(pb, chunk_size - ret);
701 
702  av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
703  }
704 
705  avio_skip(pb, end - avio_tell(pb));
706  } else {
707  av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
708  avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
709  }
710  }
711 
712  if (!data_ofs)
713  return AVERROR_EOF;
714 
715  ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
717 
718  handle_stream_probing(st);
720 
721  avio_seek(pb, data_ofs, SEEK_SET);
722 
723  return 0;
724 }
725 
726 AVInputFormat ff_w64_demuxer = {
727  .name = "w64",
728  .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
729  .priv_data_size = sizeof(WAVDemuxContext),
730  .read_probe = w64_probe,
731  .read_header = w64_read_header,
732  .read_packet = wav_read_packet,
733  .read_seek = wav_read_seek,
734  .flags = AVFMT_GENERIC_INDEX,
735  .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
736 };
737 #endif /* CONFIG_W64_DEMUXER */