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path: root/libavformat/wavenc.c (plain)
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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"
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 int 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 size_t 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)) && strlen(tmp_tag->value) > 2) {
124 unsigned char umidpart_str[17] = {0};
125 int64_t i;
126 uint64_t umidpart;
127 size_t 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 AVCodecParameters *par = s->streams[0]->codecpar;
159
160 if (par->codec_id != AV_CODEC_ID_PCM_S8 &&
161 par->codec_id != AV_CODEC_ID_PCM_S16LE &&
162 par->codec_id != AV_CODEC_ID_PCM_U8 &&
163 par->codec_id != AV_CODEC_ID_PCM_U16LE) {
164 AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
165 av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
166 codec ? codec->name : "NONE");
167 return -1;
168 }
169
170 wav->peak_bps = av_get_bits_per_sample(par->codec_id) / 8;
171
172 if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
173 av_log(s, AV_LOG_ERROR,
174 "Writing 16 bit peak for 8 bit audio does not make sense\n");
175 return AVERROR(EINVAL);
176 }
177
178 wav->peak_maxpos = av_mallocz_array(par->channels, sizeof(*wav->peak_maxpos));
179 wav->peak_maxneg = av_mallocz_array(par->channels, sizeof(*wav->peak_maxneg));
180 wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
181 if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
182 goto nomem;
183
184 wav->peak_outbuf_size = PEAK_BUFFER_SIZE;
185
186 return 0;
187
188nomem:
189 av_log(s, AV_LOG_ERROR, "Out of memory\n");
190 peak_free_buffers(s);
191 return AVERROR(ENOMEM);
192}
193
194static void peak_write_frame(AVFormatContext *s)
195{
196 WAVMuxContext *wav = s->priv_data;
197 AVCodecParameters *par = s->streams[0]->codecpar;
198 int peak_of_peaks;
199 int c;
200
201 if (!wav->peak_output)
202 return;
203
204 for (c = 0; c < par->channels; c++) {
205 wav->peak_maxneg[c] = -wav->peak_maxneg[c];
206
207 if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
208 wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
209 wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
210 }
211
212 if (wav->peak_ppv == 1)
213 wav->peak_maxpos[c] =
214 FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
215
216 peak_of_peaks = FFMAX3(wav->peak_maxpos[c], wav->peak_maxneg[c],
217 wav->peak_pop);
218 if (peak_of_peaks > wav->peak_pop)
219 wav->peak_pos_pop = wav->peak_num_frames;
220 wav->peak_pop = peak_of_peaks;
221
222 if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
223 wav->peak_format * wav->peak_ppv) {
224 wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
225 wav->peak_output = av_realloc(wav->peak_output,
226 wav->peak_outbuf_size);
227 if (!wav->peak_output) {
228 av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
229 return;
230 }
231 }
232
233 if (wav->peak_format == PEAK_FORMAT_UINT8) {
234 wav->peak_output[wav->peak_outbuf_bytes++] =
235 wav->peak_maxpos[c];
236 if (wav->peak_ppv == 2) {
237 wav->peak_output[wav->peak_outbuf_bytes++] =
238 wav->peak_maxneg[c];
239 }
240 } else {
241 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
242 wav->peak_maxpos[c]);
243 wav->peak_outbuf_bytes += 2;
244 if (wav->peak_ppv == 2) {
245 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
246 wav->peak_maxneg[c]);
247 wav->peak_outbuf_bytes += 2;
248 }
249 }
250 wav->peak_maxpos[c] = 0;
251 wav->peak_maxneg[c] = 0;
252 }
253 wav->peak_num_frames++;
254}
255
256static int peak_write_chunk(AVFormatContext *s)
257{
258 WAVMuxContext *wav = s->priv_data;
259 AVIOContext *pb = s->pb;
260 AVCodecParameters *par = s->streams[0]->codecpar;
261 int64_t peak = ff_start_tag(s->pb, "levl");
262 int64_t now0;
263 time_t now_secs;
264 char timestamp[28];
265
266 /* Peak frame of incomplete block at end */
267 if (wav->peak_block_pos)
268 peak_write_frame(s);
269
270 memset(timestamp, 0, sizeof(timestamp));
271 if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
272 struct tm tmpbuf;
273 av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
274 now0 = av_gettime();
275 now_secs = now0 / 1000000;
276 if (strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf))) {
277 av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
278 } else {
279 av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
280 return -1;
281 }
282 }
283
284 avio_wl32(pb, 1); /* version */
285 avio_wl32(pb, wav->peak_format); /* 8 or 16 bit */
286 avio_wl32(pb, wav->peak_ppv); /* positive and negative */
287 avio_wl32(pb, wav->peak_block_size); /* frames per value */
288 avio_wl32(pb, par->channels); /* number of channels */
289 avio_wl32(pb, wav->peak_num_frames); /* number of peak frames */
290 avio_wl32(pb, wav->peak_pos_pop); /* audio sample frame index */
291 avio_wl32(pb, 128); /* equal to size of header */
292 avio_write(pb, timestamp, 28); /* ASCII time stamp */
293 ffio_fill(pb, 0, 60);
294
295 avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
296
297 ff_end_tag(pb, peak);
298
299 if (!wav->data)
300 wav->data = peak;
301
302 return 0;
303}
304
305static int wav_write_header(AVFormatContext *s)
306{
307 WAVMuxContext *wav = s->priv_data;
308 AVIOContext *pb = s->pb;
309 int64_t fmt;
310
311 if (s->nb_streams != 1) {
312 av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
313 return AVERROR(EINVAL);
314 }
315
316 if (wav->rf64 == RF64_ALWAYS) {
317 ffio_wfourcc(pb, "RF64");
318 avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
319 } else {
320 ffio_wfourcc(pb, "RIFF");
321 avio_wl32(pb, -1); /* file length */
322 }
323
324 ffio_wfourcc(pb, "WAVE");
325
326 if (wav->rf64 != RF64_NEVER) {
327 /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
328 ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
329 avio_wl32(pb, 28); /* chunk size */
330 wav->ds64 = avio_tell(pb);
331 ffio_fill(pb, 0, 28);
332 }
333
334 if (wav->write_peak != 2) {
335 /* format header */
336 fmt = ff_start_tag(pb, "fmt ");
337 if (ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0) < 0) {
338 const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codecpar->codec_id);
339 av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
340 desc ? desc->name : "unknown");
341 return AVERROR(ENOSYS);
342 }
343 ff_end_tag(pb, fmt);
344 }
345
346 if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
347 && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
348 wav->fact_pos = ff_start_tag(pb, "fact");
349 avio_wl32(pb, 0);
350 ff_end_tag(pb, wav->fact_pos);
351 }
352
353 if (wav->write_bext)
354 bwf_write_bext_chunk(s);
355
356 if (wav->write_peak) {
357 int ret;
358 if ((ret = peak_init_writer(s)) < 0)
359 return ret;
360 }
361
362 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
363 wav->maxpts = wav->last_duration = 0;
364 wav->minpts = INT64_MAX;
365
366 if (wav->write_peak != 2) {
367 /* info header */
368 ff_riff_write_info(s);
369
370 /* data header */
371 wav->data = ff_start_tag(pb, "data");
372 }
373
374 avio_flush(pb);
375
376 return 0;
377}
378
379static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
380{
381 AVIOContext *pb = s->pb;
382 WAVMuxContext *wav = s->priv_data;
383
384 if (wav->write_peak != 2)
385 avio_write(pb, pkt->data, pkt->size);
386
387 if (wav->write_peak) {
388 int c = 0;
389 int i;
390 for (i = 0; i < pkt->size; i += wav->peak_bps) {
391 if (wav->peak_bps == 1) {
392 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
393 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
394 } else {
395 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
396 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
397 }
398 if (++c == s->streams[0]->codecpar->channels) {
399 c = 0;
400 if (++wav->peak_block_pos == wav->peak_block_size) {
401 peak_write_frame(s);
402 wav->peak_block_pos = 0;
403 }
404 }
405 }
406 }
407
408 if(pkt->pts != AV_NOPTS_VALUE) {
409 wav->minpts = FFMIN(wav->minpts, pkt->pts);
410 wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
411 wav->last_duration = pkt->duration;
412 } else
413 av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
414 return 0;
415}
416
417static int wav_write_trailer(AVFormatContext *s)
418{
419 AVIOContext *pb = s->pb;
420 WAVMuxContext *wav = s->priv_data;
421 int64_t file_size, data_size;
422 int64_t number_of_samples = 0;
423 int rf64 = 0;
424 int ret = 0;
425
426 avio_flush(pb);
427
428 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
429 if (wav->write_peak != 2 && avio_tell(pb) - wav->data < UINT32_MAX) {
430 ff_end_tag(pb, wav->data);
431 avio_flush(pb);
432 }
433
434 if (wav->write_peak && wav->peak_output) {
435 ret = peak_write_chunk(s);
436 avio_flush(pb);
437 }
438
439 /* update file size */
440 file_size = avio_tell(pb);
441 data_size = file_size - wav->data;
442 if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
443 rf64 = 1;
444 } else if (file_size - 8 <= UINT32_MAX) {
445 avio_seek(pb, 4, SEEK_SET);
446 avio_wl32(pb, (uint32_t)(file_size - 8));
447 avio_seek(pb, file_size, SEEK_SET);
448
449 avio_flush(pb);
450 } else {
451 av_log(s, AV_LOG_ERROR,
452 "Filesize %"PRId64" invalid for wav, output file will be broken\n",
453 file_size);
454 }
455
456 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
457 s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
458 s->streams[0]->time_base.den);
459
460 if(s->streams[0]->codecpar->codec_tag != 0x01) {
461 /* Update num_samps in fact chunk */
462 avio_seek(pb, wav->fact_pos, SEEK_SET);
463 if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
464 rf64 = 1;
465 avio_wl32(pb, -1);
466 } else {
467 avio_wl32(pb, number_of_samples);
468 avio_seek(pb, file_size, SEEK_SET);
469 avio_flush(pb);
470 }
471 }
472
473 if (rf64) {
474 /* overwrite RIFF with RF64 */
475 avio_seek(pb, 0, SEEK_SET);
476 ffio_wfourcc(pb, "RF64");
477 avio_wl32(pb, -1);
478
479 /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
480 avio_seek(pb, wav->ds64 - 8, SEEK_SET);
481 ffio_wfourcc(pb, "ds64");
482 avio_wl32(pb, 28); /* ds64 chunk size */
483 avio_wl64(pb, file_size - 8); /* RF64 chunk size */
484 avio_wl64(pb, data_size); /* data chunk size */
485 avio_wl64(pb, number_of_samples); /* fact chunk number of samples */
486 avio_wl32(pb, 0); /* number of table entries for non-'data' chunks */
487
488 /* write -1 in data chunk size */
489 avio_seek(pb, wav->data - 4, SEEK_SET);
490 avio_wl32(pb, -1);
491
492 avio_seek(pb, file_size, SEEK_SET);
493 avio_flush(pb);
494 }
495 }
496
497 if (wav->write_peak)
498 peak_free_buffers(s);
499
500 return ret;
501}
502
503#define OFFSET(x) offsetof(WAVMuxContext, x)
504#define ENC AV_OPT_FLAG_ENCODING_PARAM
505static const AVOption options[] = {
506 { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
507 { "write_peak", "Write Peak Envelope chunk.", OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
508 { "off", "Do not write peak chunk.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF }, 0, 0, ENC, "peak" },
509 { "on", "Append peak chunk after wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ON }, 0, 0, ENC, "peak" },
510 { "only", "Write only peak chunk, omit wav data.", 0, AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
511 { "rf64", "Use RF64 header rather than RIFF for large files.", OFFSET(rf64), AV_OPT_TYPE_INT, { .i64 = RF64_NEVER },-1, 1, ENC, "rf64" },
512 { "auto", "Write RF64 header if file grows large enough.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO }, 0, 0, ENC, "rf64" },
513 { "always", "Always write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
514 { "never", "Never write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER }, 0, 0, ENC, "rf64" },
515 { "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 },
516 { "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 },
517 { "peak_ppv", "Number of peak points per peak value (1 or 2).", OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
518 { NULL },
519};
520
521static const AVClass wav_muxer_class = {
522 .class_name = "WAV muxer",
523 .item_name = av_default_item_name,
524 .option = options,
525 .version = LIBAVUTIL_VERSION_INT,
526};
527
528AVOutputFormat ff_wav_muxer = {
529 .name = "wav",
530 .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
531 .mime_type = "audio/x-wav",
532 .extensions = "wav",
533 .priv_data_size = sizeof(WAVMuxContext),
534 .audio_codec = AV_CODEC_ID_PCM_S16LE,
535 .video_codec = AV_CODEC_ID_NONE,
536 .write_header = wav_write_header,
537 .write_packet = wav_write_packet,
538 .write_trailer = wav_write_trailer,
539 .flags = AVFMT_TS_NONSTRICT,
540 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
541 .priv_class = &wav_muxer_class,
542};
543#endif /* CONFIG_WAV_MUXER */
544
545#if CONFIG_W64_MUXER
546#include "w64.h"
547
548static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
549{
550 *pos = avio_tell(pb);
551
552 avio_write(pb, guid, 16);
553 avio_wl64(pb, INT64_MAX);
554}
555
556static void end_guid(AVIOContext *pb, int64_t start)
557{
558 int64_t end, pos = avio_tell(pb);
559
560 end = FFALIGN(pos, 8);
561 ffio_fill(pb, 0, end - pos);
562 avio_seek(pb, start + 16, SEEK_SET);
563 avio_wl64(pb, end - start);
564 avio_seek(pb, end, SEEK_SET);
565}
566
567static int w64_write_header(AVFormatContext *s)
568{
569 WAVMuxContext *wav = s->priv_data;
570 AVIOContext *pb = s->pb;
571 int64_t start;
572 int ret;
573
574 avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
575 avio_wl64(pb, -1);
576 avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
577 start_guid(pb, ff_w64_guid_fmt, &start);
578 if ((ret = ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0)) < 0) {
579 AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
580 av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
581 codec ? codec->name : "NONE");
582 return ret;
583 }
584 end_guid(pb, start);
585
586 if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
587 && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
588 start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
589 avio_wl64(pb, 0);
590 end_guid(pb, wav->fact_pos);
591 }
592
593 start_guid(pb, ff_w64_guid_data, &wav->data);
594
595 return 0;
596}
597
598static int w64_write_trailer(AVFormatContext *s)
599{
600 AVIOContext *pb = s->pb;
601 WAVMuxContext *wav = s->priv_data;
602 int64_t file_size;
603
604 if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
605 end_guid(pb, wav->data);
606
607 file_size = avio_tell(pb);
608 avio_seek(pb, 16, SEEK_SET);
609 avio_wl64(pb, file_size);
610
611 if (s->streams[0]->codecpar->codec_tag != 0x01) {
612 int64_t number_of_samples;
613
614 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
615 s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
616 s->streams[0]->time_base.den);
617 avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
618 avio_wl64(pb, number_of_samples);
619 }
620
621 avio_seek(pb, file_size, SEEK_SET);
622 avio_flush(pb);
623 }
624
625 return 0;
626}
627
628AVOutputFormat ff_w64_muxer = {
629 .name = "w64",
630 .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
631 .extensions = "w64",
632 .priv_data_size = sizeof(WAVMuxContext),
633 .audio_codec = AV_CODEC_ID_PCM_S16LE,
634 .video_codec = AV_CODEC_ID_NONE,
635 .write_header = w64_write_header,
636 .write_packet = wav_write_packet,
637 .write_trailer = w64_write_trailer,
638 .flags = AVFMT_TS_NONSTRICT,
639 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
640};
641#endif /* CONFIG_W64_MUXER */
642
generated by cgit at 2024-05-17 02:26:24 (GMT)