Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / wavenc.c
... / ...
CommitLineData
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"
41#include "libavutil/time_internal.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
55typedef enum {
56 PEAK_OFF = 0,
57 PEAK_ON,
58 PEAK_ONLY
59} PeakType;
60
61typedef enum {
62 PEAK_FORMAT_UINT8 = 1,
63 PEAK_FORMAT_UINT16
64} PeakFormat;
65
66typedef 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;
73 int16_t *peak_maxpos, *peak_maxneg;
74 uint32_t peak_num_frames;
75 uint32_t peak_outbuf_size;
76 uint32_t peak_outbuf_bytes;
77 uint32_t peak_pos_pop;
78 uint16_t peak_pop;
79 uint8_t *peak_output;
80 int last_duration;
81 int write_bext;
82 int write_peak;
83 int rf64;
84 int peak_block_size;
85 PeakFormat peak_format;
86 int peak_block_pos;
87 int peak_ppv;
88 int peak_bps;
89} WAVMuxContext;
90
91#if CONFIG_WAV_MUXER
92static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
93{
94 AVDictionaryEntry *tag;
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
106static 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
146static 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
155static 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 &&
161 enc->codec_id != AV_CODEC_ID_PCM_S16LE &&
162 enc->codec_id != AV_CODEC_ID_PCM_U8 &&
163 enc->codec_id != AV_CODEC_ID_PCM_U16LE) {
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));
179 wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
180 if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
181 goto nomem;
182
183 wav->peak_outbuf_size = PEAK_BUFFER_SIZE;
184
185 return 0;
186
187nomem:
188 av_log(s, AV_LOG_ERROR, "Out of memory\n");
189 peak_free_buffers(s);
190 return AVERROR(ENOMEM);
191}
192
193static 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) {
223 wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
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 {
240 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
241 wav->peak_maxpos[c]);
242 wav->peak_outbuf_bytes += 2;
243 if (wav->peak_ppv == 2) {
244 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
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
255static void 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 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 }
278
279 avio_wl32(pb, 1); /* version */
280 avio_wl32(pb, wav->peak_format); /* 8 or 16 bit */
281 avio_wl32(pb, wav->peak_ppv); /* positive and negative */
282 avio_wl32(pb, wav->peak_block_size); /* frames per value */
283 avio_wl32(pb, enc->channels); /* number of channels */
284 avio_wl32(pb, wav->peak_num_frames); /* number of peak frames */
285 avio_wl32(pb, wav->peak_pos_pop); /* audio sample frame index */
286 avio_wl32(pb, 128); /* equal to size of header */
287 avio_write(pb, timestamp, 28); /* ASCII time stamp */
288 ffio_fill(pb, 0, 60);
289
290 avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
291
292 ff_end_tag(pb, peak);
293
294 if (!wav->data)
295 wav->data = peak;
296}
297
298static int wav_write_header(AVFormatContext *s)
299{
300 WAVMuxContext *wav = s->priv_data;
301 AVIOContext *pb = s->pb;
302 int64_t fmt;
303
304 if (s->nb_streams != 1) {
305 av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
306 return AVERROR(EINVAL);
307 }
308
309 if (wav->rf64 == RF64_ALWAYS) {
310 ffio_wfourcc(pb, "RF64");
311 avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
312 } else {
313 ffio_wfourcc(pb, "RIFF");
314 avio_wl32(pb, -1); /* file length */
315 }
316
317 ffio_wfourcc(pb, "WAVE");
318
319 if (wav->rf64 != RF64_NEVER) {
320 /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
321 ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
322 avio_wl32(pb, 28); /* chunk size */
323 wav->ds64 = avio_tell(pb);
324 ffio_fill(pb, 0, 28);
325 }
326
327 if (wav->write_peak != 2) {
328 /* format header */
329 fmt = ff_start_tag(pb, "fmt ");
330 if (ff_put_wav_header(pb, s->streams[0]->codec, 0) < 0) {
331 const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codec->codec_id);
332 av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
333 desc ? desc->name : "unknown");
334 return AVERROR(ENOSYS);
335 }
336 ff_end_tag(pb, fmt);
337 }
338
339 if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
340 && s->pb->seekable) {
341 wav->fact_pos = ff_start_tag(pb, "fact");
342 avio_wl32(pb, 0);
343 ff_end_tag(pb, wav->fact_pos);
344 }
345
346 if (wav->write_bext)
347 bwf_write_bext_chunk(s);
348
349 if (wav->write_peak) {
350 int ret;
351 if ((ret = peak_init_writer(s)) < 0)
352 return ret;
353 }
354
355 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
356 wav->maxpts = wav->last_duration = 0;
357 wav->minpts = INT64_MAX;
358
359 if (wav->write_peak != 2) {
360 /* info header */
361 ff_riff_write_info(s);
362
363 /* data header */
364 wav->data = ff_start_tag(pb, "data");
365 }
366
367 avio_flush(pb);
368
369 return 0;
370}
371
372static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
373{
374 AVIOContext *pb = s->pb;
375 WAVMuxContext *wav = s->priv_data;
376
377 if (wav->write_peak != 2)
378 avio_write(pb, pkt->data, pkt->size);
379
380 if (wav->write_peak) {
381 int c = 0;
382 int i;
383 for (i = 0; i < pkt->size; i += wav->peak_bps) {
384 if (wav->peak_bps == 1) {
385 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
386 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
387 } else {
388 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
389 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
390 }
391 if (++c == s->streams[0]->codec->channels) {
392 c = 0;
393 if (++wav->peak_block_pos == wav->peak_block_size) {
394 peak_write_frame(s);
395 wav->peak_block_pos = 0;
396 }
397 }
398 }
399 }
400
401 if(pkt->pts != AV_NOPTS_VALUE) {
402 wav->minpts = FFMIN(wav->minpts, pkt->pts);
403 wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
404 wav->last_duration = pkt->duration;
405 } else
406 av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
407 return 0;
408}
409
410static int wav_write_trailer(AVFormatContext *s)
411{
412 AVIOContext *pb = s->pb;
413 WAVMuxContext *wav = s->priv_data;
414 int64_t file_size, data_size;
415 int64_t number_of_samples = 0;
416 int rf64 = 0;
417
418 avio_flush(pb);
419
420 if (s->pb->seekable) {
421 if (wav->write_peak != 2) {
422 ff_end_tag(pb, wav->data);
423 avio_flush(pb);
424 }
425
426 if (wav->write_peak && wav->peak_output) {
427 peak_write_chunk(s);
428 avio_flush(pb);
429 }
430
431 /* update file size */
432 file_size = avio_tell(pb);
433 data_size = file_size - wav->data;
434 if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
435 rf64 = 1;
436 } else {
437 avio_seek(pb, 4, SEEK_SET);
438 avio_wl32(pb, (uint32_t)(file_size - 8));
439 avio_seek(pb, file_size, SEEK_SET);
440
441 avio_flush(pb);
442 }
443
444 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
445 s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
446 s->streams[0]->time_base.den);
447
448 if(s->streams[0]->codec->codec_tag != 0x01) {
449 /* Update num_samps in fact chunk */
450 avio_seek(pb, wav->fact_pos, SEEK_SET);
451 if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
452 rf64 = 1;
453 avio_wl32(pb, -1);
454 } else {
455 avio_wl32(pb, number_of_samples);
456 avio_seek(pb, file_size, SEEK_SET);
457 avio_flush(pb);
458 }
459 }
460
461 if (rf64) {
462 /* overwrite RIFF with RF64 */
463 avio_seek(pb, 0, SEEK_SET);
464 ffio_wfourcc(pb, "RF64");
465 avio_wl32(pb, -1);
466
467 /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
468 avio_seek(pb, wav->ds64 - 8, SEEK_SET);
469 ffio_wfourcc(pb, "ds64");
470 avio_wl32(pb, 28); /* ds64 chunk size */
471 avio_wl64(pb, file_size - 8); /* RF64 chunk size */
472 avio_wl64(pb, data_size); /* data chunk size */
473 avio_wl64(pb, number_of_samples); /* fact chunk number of samples */
474 avio_wl32(pb, 0); /* number of table entries for non-'data' chunks */
475
476 /* write -1 in data chunk size */
477 avio_seek(pb, wav->data - 4, SEEK_SET);
478 avio_wl32(pb, -1);
479
480 avio_seek(pb, file_size, SEEK_SET);
481 avio_flush(pb);
482 }
483 }
484
485 if (wav->write_peak)
486 peak_free_buffers(s);
487
488 return 0;
489}
490
491#define OFFSET(x) offsetof(WAVMuxContext, x)
492#define ENC AV_OPT_FLAG_ENCODING_PARAM
493static const AVOption options[] = {
494 { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
495 { "write_peak", "Write Peak Envelope chunk.", OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
496 { "off", "Do not write peak chunk.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF }, 0, 0, ENC, "peak" },
497 { "on", "Append peak chunk after wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ON }, 0, 0, ENC, "peak" },
498 { "only", "Write only peak chunk, omit wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
499 { "rf64", "Use RF64 header rather than RIFF for large files.", OFFSET(rf64), AV_OPT_TYPE_INT, { .i64 = RF64_NEVER },-1, 1, ENC, "rf64" },
500 { "auto", "Write RF64 header if file grows large enough.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO }, 0, 0, ENC, "rf64" },
501 { "always", "Always write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
502 { "never", "Never write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER }, 0, 0, ENC, "rf64" },
503 { "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 },
504 { "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 },
505 { "peak_ppv", "Number of peak points per peak value (1 or 2).", OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
506 { NULL },
507};
508
509static const AVClass wav_muxer_class = {
510 .class_name = "WAV muxer",
511 .item_name = av_default_item_name,
512 .option = options,
513 .version = LIBAVUTIL_VERSION_INT,
514};
515
516AVOutputFormat ff_wav_muxer = {
517 .name = "wav",
518 .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
519 .mime_type = "audio/x-wav",
520 .extensions = "wav",
521 .priv_data_size = sizeof(WAVMuxContext),
522 .audio_codec = AV_CODEC_ID_PCM_S16LE,
523 .video_codec = AV_CODEC_ID_NONE,
524 .write_header = wav_write_header,
525 .write_packet = wav_write_packet,
526 .write_trailer = wav_write_trailer,
527 .flags = AVFMT_TS_NONSTRICT,
528 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
529 .priv_class = &wav_muxer_class,
530};
531#endif /* CONFIG_WAV_MUXER */
532
533#if CONFIG_W64_MUXER
534#include "w64.h"
535
536static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
537{
538 *pos = avio_tell(pb);
539
540 avio_write(pb, guid, 16);
541 avio_wl64(pb, INT64_MAX);
542}
543
544static void end_guid(AVIOContext *pb, int64_t start)
545{
546 int64_t end, pos = avio_tell(pb);
547
548 end = FFALIGN(pos, 8);
549 ffio_fill(pb, 0, end - pos);
550 avio_seek(pb, start + 16, SEEK_SET);
551 avio_wl64(pb, end - start);
552 avio_seek(pb, end, SEEK_SET);
553}
554
555static int w64_write_header(AVFormatContext *s)
556{
557 WAVMuxContext *wav = s->priv_data;
558 AVIOContext *pb = s->pb;
559 int64_t start;
560 int ret;
561
562 avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
563 avio_wl64(pb, -1);
564 avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
565 start_guid(pb, ff_w64_guid_fmt, &start);
566 if ((ret = ff_put_wav_header(pb, s->streams[0]->codec, 0)) < 0) {
567 av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
568 s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
569 return ret;
570 }
571 end_guid(pb, start);
572
573 if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
574 && s->pb->seekable) {
575 start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
576 avio_wl64(pb, 0);
577 end_guid(pb, wav->fact_pos);
578 }
579
580 start_guid(pb, ff_w64_guid_data, &wav->data);
581
582 return 0;
583}
584
585static int w64_write_trailer(AVFormatContext *s)
586{
587 AVIOContext *pb = s->pb;
588 WAVMuxContext *wav = s->priv_data;
589 int64_t file_size;
590
591 if (pb->seekable) {
592 end_guid(pb, wav->data);
593
594 file_size = avio_tell(pb);
595 avio_seek(pb, 16, SEEK_SET);
596 avio_wl64(pb, file_size);
597
598 if (s->streams[0]->codec->codec_tag != 0x01) {
599 int64_t number_of_samples;
600
601 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
602 s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
603 s->streams[0]->time_base.den);
604 avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
605 avio_wl64(pb, number_of_samples);
606 }
607
608 avio_seek(pb, file_size, SEEK_SET);
609 avio_flush(pb);
610 }
611
612 return 0;
613}
614
615AVOutputFormat ff_w64_muxer = {
616 .name = "w64",
617 .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
618 .extensions = "w64",
619 .priv_data_size = sizeof(WAVMuxContext),
620 .audio_codec = AV_CODEC_ID_PCM_S16LE,
621 .video_codec = AV_CODEC_ID_NONE,
622 .write_header = w64_write_header,
623 .write_packet = wav_write_packet,
624 .write_trailer = w64_write_trailer,
625 .flags = AVFMT_TS_NONSTRICT,
626 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
627};
628#endif /* CONFIG_W64_MUXER */