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wavenc.c
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1 /*
2  * WAV muxer
3  * Copyright (c) 2001, 2002 Fabrice Bellard
4  *
5  * Sony Wave64 muxer
6  * Copyright (c) 2012 Paul B Mahol
7  *
8  * WAV muxer RF64 support
9  * Copyright (c) 2013 Daniel Verkamp <daniel@drv.nu>
10  *
11  * EBU Tech 3285 - Supplement 3 - Peak Envelope Chunk encoder
12  * Copyright (c) 2014 Georg Lippitsch <georg.lippitsch@gmx.at>
13  *
14  * This file is part of FFmpeg.
15  *
16  * FFmpeg is free software; you can redistribute it and/or
17  * modify it under the terms of the GNU Lesser General Public
18  * License as published by the Free Software Foundation; either
19  * version 2.1 of the License, or (at your option) any later version.
20  *
21  * FFmpeg is distributed in the hope that it will be useful,
22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24  * Lesser General Public License for more details.
25  *
26  * You should have received a copy of the GNU Lesser General Public
27  * License along with FFmpeg; if not, write to the Free Software
28  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29  */
30 
31 #include <stdint.h>
32 #include <string.h>
33 
34 #include "libavutil/avstring.h"
35 #include "libavutil/dict.h"
36 #include "libavutil/common.h"
37 #include "libavutil/intreadwrite.h"
38 #include "libavutil/mathematics.h"
39 #include "libavutil/opt.h"
40 #include "libavutil/time.h"
42 
43 #include "avformat.h"
44 #include "avio.h"
45 #include "avio_internal.h"
46 #include "internal.h"
47 #include "riff.h"
48 
49 #define RF64_AUTO (-1)
50 #define RF64_NEVER 0
51 #define RF64_ALWAYS 1
52 
53 #define PEAK_BUFFER_SIZE 1024
54 
55 typedef enum {
56  PEAK_OFF = 0,
59 } PeakType;
60 
61 typedef enum {
64 } PeakFormat;
65 
66 typedef struct WAVMuxContext {
67  const AVClass *class;
68  int64_t data;
69  int64_t fact_pos;
70  int64_t ds64;
71  int64_t minpts;
72  int64_t maxpts;
74  uint32_t peak_num_frames;
75  uint32_t peak_outbuf_size;
77  uint32_t peak_pos_pop;
78  uint16_t peak_pop;
83  int rf64;
87  int peak_ppv;
88  int peak_bps;
90 
91 #if CONFIG_WAV_MUXER
92 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
93 {
95  int len = 0;
96 
97  if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
98  len = strlen(tag->value);
99  len = FFMIN(len, maxlen);
100  avio_write(s->pb, tag->value, len);
101  }
102 
103  ffio_fill(s->pb, 0, maxlen - len);
104 }
105 
106 static void bwf_write_bext_chunk(AVFormatContext *s)
107 {
108  AVDictionaryEntry *tmp_tag;
109  uint64_t time_reference = 0;
110  int64_t bext = ff_start_tag(s->pb, "bext");
111 
112  bwf_write_bext_string(s, "description", 256);
113  bwf_write_bext_string(s, "originator", 32);
114  bwf_write_bext_string(s, "originator_reference", 32);
115  bwf_write_bext_string(s, "origination_date", 10);
116  bwf_write_bext_string(s, "origination_time", 8);
117 
118  if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
119  time_reference = strtoll(tmp_tag->value, NULL, 10);
120  avio_wl64(s->pb, time_reference);
121  avio_wl16(s->pb, 1); // set version to 1
122 
123  if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
124  unsigned char umidpart_str[17] = {0};
125  int i;
126  uint64_t umidpart;
127  int len = strlen(tmp_tag->value+2);
128 
129  for (i = 0; i < len/16; i++) {
130  memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
131  umidpart = strtoll(umidpart_str, NULL, 16);
132  avio_wb64(s->pb, umidpart);
133  }
134  ffio_fill(s->pb, 0, 64 - i*8);
135  } else
136  ffio_fill(s->pb, 0, 64); // zero UMID
137 
138  ffio_fill(s->pb, 0, 190); // Reserved
139 
140  if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
141  avio_put_str(s->pb, tmp_tag->value);
142 
143  ff_end_tag(s->pb, bext);
144 }
145 
146 static av_cold void peak_free_buffers(AVFormatContext *s)
147 {
148  WAVMuxContext *wav = s->priv_data;
149 
150  av_freep(&wav->peak_maxpos);
151  av_freep(&wav->peak_maxneg);
152  av_freep(&wav->peak_output);
153 }
154 
155 static av_cold int peak_init_writer(AVFormatContext *s)
156 {
157  WAVMuxContext *wav = s->priv_data;
158  AVCodecContext *enc = s->streams[0]->codec;
159 
160  if (enc->codec_id != AV_CODEC_ID_PCM_S8 &&
162  enc->codec_id != AV_CODEC_ID_PCM_U8 &&
164  av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
165  s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
166  return -1;
167  }
168 
169  wav->peak_bps = av_get_bits_per_sample(enc->codec_id) / 8;
170 
171  if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
172  av_log(s, AV_LOG_ERROR,
173  "Writing 16 bit peak for 8 bit audio does not make sense\n");
174  return AVERROR(EINVAL);
175  }
176 
177  wav->peak_maxpos = av_mallocz_array(enc->channels, sizeof(*wav->peak_maxpos));
178  wav->peak_maxneg = av_mallocz_array(enc->channels, sizeof(*wav->peak_maxneg));
180  if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
181  goto nomem;
182 
184 
185  return 0;
186 
187 nomem:
188  av_log(s, AV_LOG_ERROR, "Out of memory\n");
189  peak_free_buffers(s);
190  return AVERROR(ENOMEM);
191 }
192 
193 static void peak_write_frame(AVFormatContext *s)
194 {
195  WAVMuxContext *wav = s->priv_data;
196  AVCodecContext *enc = s->streams[0]->codec;
197  int peak_of_peaks;
198  int c;
199 
200  if (!wav->peak_output)
201  return;
202 
203  for (c = 0; c < enc->channels; c++) {
204  wav->peak_maxneg[c] = -wav->peak_maxneg[c];
205 
206  if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
207  wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
208  wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
209  }
210 
211  if (wav->peak_ppv == 1)
212  wav->peak_maxpos[c] =
213  FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
214 
215  peak_of_peaks = FFMAX3(wav->peak_maxpos[c], wav->peak_maxneg[c],
216  wav->peak_pop);
217  if (peak_of_peaks > wav->peak_pop)
218  wav->peak_pos_pop = wav->peak_num_frames;
219  wav->peak_pop = peak_of_peaks;
220 
221  if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
222  wav->peak_format * wav->peak_ppv) {
224  wav->peak_output = av_realloc(wav->peak_output,
225  wav->peak_outbuf_size);
226  if (!wav->peak_output) {
227  av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
228  return;
229  }
230  }
231 
232  if (wav->peak_format == PEAK_FORMAT_UINT8) {
233  wav->peak_output[wav->peak_outbuf_bytes++] =
234  wav->peak_maxpos[c];
235  if (wav->peak_ppv == 2) {
236  wav->peak_output[wav->peak_outbuf_bytes++] =
237  wav->peak_maxneg[c];
238  }
239  } else {
241  wav->peak_maxpos[c]);
242  wav->peak_outbuf_bytes += 2;
243  if (wav->peak_ppv == 2) {
245  wav->peak_maxneg[c]);
246  wav->peak_outbuf_bytes += 2;
247  }
248  }
249  wav->peak_maxpos[c] = 0;
250  wav->peak_maxneg[c] = 0;
251  }
252  wav->peak_num_frames++;
253 }
254 
255 static int peak_write_chunk(AVFormatContext *s)
256 {
257  WAVMuxContext *wav = s->priv_data;
258  AVIOContext *pb = s->pb;
259  AVCodecContext *enc = s->streams[0]->codec;
260  int64_t peak = ff_start_tag(s->pb, "levl");
261  int64_t now0;
262  time_t now_secs;
263  char timestamp[28];
264 
265  /* Peak frame of incomplete block at end */
266  if (wav->peak_block_pos)
267  peak_write_frame(s);
268 
269  memset(timestamp, 0, sizeof(timestamp));
270  if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
271  struct tm tmpbuf;
272  av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
273  now0 = av_gettime();
274  now_secs = now0 / 1000000;
275  if (strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf))) {
276  av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
277  } else {
278  av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
279  return -1;
280  }
281  }
282 
283  avio_wl32(pb, 1); /* version */
284  avio_wl32(pb, wav->peak_format); /* 8 or 16 bit */
285  avio_wl32(pb, wav->peak_ppv); /* positive and negative */
286  avio_wl32(pb, wav->peak_block_size); /* frames per value */
287  avio_wl32(pb, enc->channels); /* number of channels */
288  avio_wl32(pb, wav->peak_num_frames); /* number of peak frames */
289  avio_wl32(pb, wav->peak_pos_pop); /* audio sample frame index */
290  avio_wl32(pb, 128); /* equal to size of header */
291  avio_write(pb, timestamp, 28); /* ASCII time stamp */
292  ffio_fill(pb, 0, 60);
293 
294  avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
295 
296  ff_end_tag(pb, peak);
297 
298  if (!wav->data)
299  wav->data = peak;
300 
301  return 0;
302 }
303 
304 static int wav_write_header(AVFormatContext *s)
305 {
306  WAVMuxContext *wav = s->priv_data;
307  AVIOContext *pb = s->pb;
308  int64_t fmt;
309 
310  if (s->nb_streams != 1) {
311  av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
312  return AVERROR(EINVAL);
313  }
314 
315  if (wav->rf64 == RF64_ALWAYS) {
316  ffio_wfourcc(pb, "RF64");
317  avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
318  } else {
319  ffio_wfourcc(pb, "RIFF");
320  avio_wl32(pb, -1); /* file length */
321  }
322 
323  ffio_wfourcc(pb, "WAVE");
324 
325  if (wav->rf64 != RF64_NEVER) {
326  /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
327  ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
328  avio_wl32(pb, 28); /* chunk size */
329  wav->ds64 = avio_tell(pb);
330  ffio_fill(pb, 0, 28);
331  }
332 
333  if (wav->write_peak != 2) {
334  /* format header */
335  fmt = ff_start_tag(pb, "fmt ");
336  if (ff_put_wav_header(pb, s->streams[0]->codec, 0) < 0) {
338  av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
339  desc ? desc->name : "unknown");
340  return AVERROR(ENOSYS);
341  }
342  ff_end_tag(pb, fmt);
343  }
344 
345  if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
346  && s->pb->seekable) {
347  wav->fact_pos = ff_start_tag(pb, "fact");
348  avio_wl32(pb, 0);
349  ff_end_tag(pb, wav->fact_pos);
350  }
351 
352  if (wav->write_bext)
353  bwf_write_bext_chunk(s);
354 
355  if (wav->write_peak) {
356  int ret;
357  if ((ret = peak_init_writer(s)) < 0)
358  return ret;
359  }
360 
361  avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
362  wav->maxpts = wav->last_duration = 0;
363  wav->minpts = INT64_MAX;
364 
365  if (wav->write_peak != 2) {
366  /* info header */
368 
369  /* data header */
370  wav->data = ff_start_tag(pb, "data");
371  }
372 
373  avio_flush(pb);
374 
375  return 0;
376 }
377 
378 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
379 {
380  AVIOContext *pb = s->pb;
381  WAVMuxContext *wav = s->priv_data;
382 
383  if (wav->write_peak != 2)
384  avio_write(pb, pkt->data, pkt->size);
385 
386  if (wav->write_peak) {
387  int c = 0;
388  int i;
389  for (i = 0; i < pkt->size; i += wav->peak_bps) {
390  if (wav->peak_bps == 1) {
391  wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
392  wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
393  } else {
394  wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
395  wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
396  }
397  if (++c == s->streams[0]->codec->channels) {
398  c = 0;
399  if (++wav->peak_block_pos == wav->peak_block_size) {
400  peak_write_frame(s);
401  wav->peak_block_pos = 0;
402  }
403  }
404  }
405  }
406 
407  if(pkt->pts != AV_NOPTS_VALUE) {
408  wav->minpts = FFMIN(wav->minpts, pkt->pts);
409  wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
410  wav->last_duration = pkt->duration;
411  } else
412  av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
413  return 0;
414 }
415 
416 static int wav_write_trailer(AVFormatContext *s)
417 {
418  AVIOContext *pb = s->pb;
419  WAVMuxContext *wav = s->priv_data;
420  int64_t file_size, data_size;
421  int64_t number_of_samples = 0;
422  int rf64 = 0;
423  int ret = 0;
424 
425  avio_flush(pb);
426 
427  if (s->pb->seekable) {
428  if (wav->write_peak != 2) {
429  ff_end_tag(pb, wav->data);
430  avio_flush(pb);
431  }
432 
433  if (wav->write_peak && wav->peak_output) {
434  ret = peak_write_chunk(s);
435  avio_flush(pb);
436  }
437 
438  /* update file size */
439  file_size = avio_tell(pb);
440  data_size = file_size - wav->data;
441  if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
442  rf64 = 1;
443  } else {
444  avio_seek(pb, 4, SEEK_SET);
445  avio_wl32(pb, (uint32_t)(file_size - 8));
446  avio_seek(pb, file_size, SEEK_SET);
447 
448  avio_flush(pb);
449  }
450 
451  number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
452  s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
453  s->streams[0]->time_base.den);
454 
455  if(s->streams[0]->codec->codec_tag != 0x01) {
456  /* Update num_samps in fact chunk */
457  avio_seek(pb, wav->fact_pos, SEEK_SET);
458  if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
459  rf64 = 1;
460  avio_wl32(pb, -1);
461  } else {
462  avio_wl32(pb, number_of_samples);
463  avio_seek(pb, file_size, SEEK_SET);
464  avio_flush(pb);
465  }
466  }
467 
468  if (rf64) {
469  /* overwrite RIFF with RF64 */
470  avio_seek(pb, 0, SEEK_SET);
471  ffio_wfourcc(pb, "RF64");
472  avio_wl32(pb, -1);
473 
474  /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
475  avio_seek(pb, wav->ds64 - 8, SEEK_SET);
476  ffio_wfourcc(pb, "ds64");
477  avio_wl32(pb, 28); /* ds64 chunk size */
478  avio_wl64(pb, file_size - 8); /* RF64 chunk size */
479  avio_wl64(pb, data_size); /* data chunk size */
480  avio_wl64(pb, number_of_samples); /* fact chunk number of samples */
481  avio_wl32(pb, 0); /* number of table entries for non-'data' chunks */
482 
483  /* write -1 in data chunk size */
484  avio_seek(pb, wav->data - 4, SEEK_SET);
485  avio_wl32(pb, -1);
486 
487  avio_seek(pb, file_size, SEEK_SET);
488  avio_flush(pb);
489  }
490  }
491 
492  if (wav->write_peak)
493  peak_free_buffers(s);
494 
495  return ret;
496 }
497 
498 #define OFFSET(x) offsetof(WAVMuxContext, x)
499 #define ENC AV_OPT_FLAG_ENCODING_PARAM
500 static const AVOption options[] = {
501  { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
502  { "write_peak", "Write Peak Envelope chunk.", OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
503  { "off", "Do not write peak chunk.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF }, 0, 0, ENC, "peak" },
504  { "on", "Append peak chunk after wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ON }, 0, 0, ENC, "peak" },
505  { "only", "Write only peak chunk, omit wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
506  { "rf64", "Use RF64 header rather than RIFF for large files.", OFFSET(rf64), AV_OPT_TYPE_INT, { .i64 = RF64_NEVER },-1, 1, ENC, "rf64" },
507  { "auto", "Write RF64 header if file grows large enough.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO }, 0, 0, ENC, "rf64" },
508  { "always", "Always write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
509  { "never", "Never write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER }, 0, 0, ENC, "rf64" },
510  { "peak_block_size", "Number of audio samples used to generate each peak frame.", OFFSET(peak_block_size), AV_OPT_TYPE_INT, { .i64 = 256 }, 0, 65536, ENC },
511  { "peak_format", "The format of the peak envelope data (1: uint8, 2: uint16).", OFFSET(peak_format), AV_OPT_TYPE_INT, { .i64 = PEAK_FORMAT_UINT16 }, PEAK_FORMAT_UINT8, PEAK_FORMAT_UINT16, ENC },
512  { "peak_ppv", "Number of peak points per peak value (1 or 2).", OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
513  { NULL },
514 };
515 
516 static const AVClass wav_muxer_class = {
517  .class_name = "WAV muxer",
518  .item_name = av_default_item_name,
519  .option = options,
520  .version = LIBAVUTIL_VERSION_INT,
521 };
522 
523 AVOutputFormat ff_wav_muxer = {
524  .name = "wav",
525  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
526  .mime_type = "audio/x-wav",
527  .extensions = "wav",
528  .priv_data_size = sizeof(WAVMuxContext),
529  .audio_codec = AV_CODEC_ID_PCM_S16LE,
530  .video_codec = AV_CODEC_ID_NONE,
531  .write_header = wav_write_header,
532  .write_packet = wav_write_packet,
533  .write_trailer = wav_write_trailer,
535  .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
536  .priv_class = &wav_muxer_class,
537 };
538 #endif /* CONFIG_WAV_MUXER */
539 
540 #if CONFIG_W64_MUXER
541 #include "w64.h"
542 
543 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
544 {
545  *pos = avio_tell(pb);
546 
547  avio_write(pb, guid, 16);
548  avio_wl64(pb, INT64_MAX);
549 }
550 
551 static void end_guid(AVIOContext *pb, int64_t start)
552 {
553  int64_t end, pos = avio_tell(pb);
554 
555  end = FFALIGN(pos, 8);
556  ffio_fill(pb, 0, end - pos);
557  avio_seek(pb, start + 16, SEEK_SET);
558  avio_wl64(pb, end - start);
559  avio_seek(pb, end, SEEK_SET);
560 }
561 
562 static int w64_write_header(AVFormatContext *s)
563 {
564  WAVMuxContext *wav = s->priv_data;
565  AVIOContext *pb = s->pb;
566  int64_t start;
567  int ret;
568 
570  avio_wl64(pb, -1);
572  start_guid(pb, ff_w64_guid_fmt, &start);
573  if ((ret = ff_put_wav_header(pb, s->streams[0]->codec, 0)) < 0) {
574  av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
575  s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
576  return ret;
577  }
578  end_guid(pb, start);
579 
580  if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
581  && s->pb->seekable) {
582  start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
583  avio_wl64(pb, 0);
584  end_guid(pb, wav->fact_pos);
585  }
586 
587  start_guid(pb, ff_w64_guid_data, &wav->data);
588 
589  return 0;
590 }
591 
592 static int w64_write_trailer(AVFormatContext *s)
593 {
594  AVIOContext *pb = s->pb;
595  WAVMuxContext *wav = s->priv_data;
596  int64_t file_size;
597 
598  if (pb->seekable) {
599  end_guid(pb, wav->data);
600 
601  file_size = avio_tell(pb);
602  avio_seek(pb, 16, SEEK_SET);
603  avio_wl64(pb, file_size);
604 
605  if (s->streams[0]->codec->codec_tag != 0x01) {
606  int64_t number_of_samples;
607 
608  number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
609  s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
610  s->streams[0]->time_base.den);
611  avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
612  avio_wl64(pb, number_of_samples);
613  }
614 
615  avio_seek(pb, file_size, SEEK_SET);
616  avio_flush(pb);
617  }
618 
619  return 0;
620 }
621 
622 AVOutputFormat ff_w64_muxer = {
623  .name = "w64",
624  .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
625  .extensions = "w64",
626  .priv_data_size = sizeof(WAVMuxContext),
627  .audio_codec = AV_CODEC_ID_PCM_S16LE,
628  .video_codec = AV_CODEC_ID_NONE,
629  .write_header = w64_write_header,
630  .write_packet = wav_write_packet,
631  .write_trailer = w64_write_trailer,
633  .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
634 };
635 #endif /* CONFIG_W64_MUXER */