aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/wavenc.c
blob: f6f5710802d1c95cdbcec1d5590264e9eff5b0c8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
/*
 * WAV muxer
 * Copyright (c) 2001, 2002 Fabrice Bellard
 *
 * Sony Wave64 muxer
 * Copyright (c) 2012 Paul B Mahol
 *
 * WAV muxer RF64 support
 * Copyright (c) 2013 Daniel Verkamp <daniel@drv.nu>
 *
 * EBU Tech 3285 - Supplement 3 - Peak Envelope Chunk encoder
 * Copyright (c) 2014 Georg Lippitsch <georg.lippitsch@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>
#include <string.h>

#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/time_internal.h"

#include "avformat.h"
#include "avio.h"
#include "avio_internal.h"
#include "internal.h"
#include "riff.h"

#define RF64_AUTO   (-1)
#define RF64_NEVER  0
#define RF64_ALWAYS 1

#define PEAK_BUFFER_SIZE   1024

typedef enum {
    PEAK_OFF = 0,
    PEAK_ON,
    PEAK_ONLY
} PeakType;

typedef enum {
    PEAK_FORMAT_UINT8 = 1,
    PEAK_FORMAT_UINT16
} PeakFormat;

typedef struct WAVMuxContext {
    const AVClass *class;
    int64_t data;
    int64_t fact_pos;
    int64_t ds64;
    int64_t minpts;
    int64_t maxpts;
    int16_t *peak_maxpos, *peak_maxneg;
    uint32_t peak_num_frames;
    uint32_t peak_outbuf_size;
    uint32_t peak_outbuf_bytes;
    uint8_t *peak_output;
    int last_duration;
    int write_bext;
    int write_peak;
    int rf64;
    int peak_block_size;
    int peak_format;
    int peak_block_pos;
    int peak_ppv;
    int peak_bps;
} WAVMuxContext;

#if CONFIG_WAV_MUXER
static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
{
    AVDictionaryEntry *tag;
    size_t len = 0;

    if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
        len = strlen(tag->value);
        len = FFMIN(len, maxlen);
        avio_write(s->pb, tag->value, len);
    }

    ffio_fill(s->pb, 0, maxlen - len);
}

static void bwf_write_bext_chunk(AVFormatContext *s)
{
    AVDictionaryEntry *tmp_tag;
    uint64_t time_reference = 0;
    int64_t bext = ff_start_tag(s->pb, "bext");

    bwf_write_bext_string(s, "description", 256);
    bwf_write_bext_string(s, "originator", 32);
    bwf_write_bext_string(s, "originator_reference", 32);
    bwf_write_bext_string(s, "origination_date", 10);
    bwf_write_bext_string(s, "origination_time", 8);

    if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
        time_reference = strtoll(tmp_tag->value, NULL, 10);
    avio_wl64(s->pb, time_reference);
    avio_wl16(s->pb, 1);  // set version to 1

    if ((tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) && strlen(tmp_tag->value) > 2) {
        unsigned char umidpart_str[17] = {0};
        int64_t i;
        uint64_t umidpart;
        size_t len = strlen(tmp_tag->value+2);

        for (i = 0; i < len/16; i++) {
            memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
            umidpart = strtoll(umidpart_str, NULL, 16);
            avio_wb64(s->pb, umidpart);
        }
        ffio_fill(s->pb, 0, 64 - i*8);
    } else
        ffio_fill(s->pb, 0, 64); // zero UMID

    ffio_fill(s->pb, 0, 190); // Reserved

    if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
        avio_put_str(s->pb, tmp_tag->value);

    ff_end_tag(s->pb, bext);
}

static av_cold void wav_deinit(AVFormatContext *s)
{
    WAVMuxContext *wav = s->priv_data;

    av_freep(&wav->peak_maxpos);
    av_freep(&wav->peak_maxneg);
    av_freep(&wav->peak_output);
}

static av_cold int peak_init_writer(AVFormatContext *s)
{
    WAVMuxContext *wav = s->priv_data;
    AVCodecParameters *par = s->streams[0]->codecpar;

    if (par->codec_id != AV_CODEC_ID_PCM_S8 &&
        par->codec_id != AV_CODEC_ID_PCM_S16LE &&
        par->codec_id != AV_CODEC_ID_PCM_U8 &&
        par->codec_id != AV_CODEC_ID_PCM_U16LE) {
        AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
        av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
               codec ? codec->name : "NONE");
        return -1;
    }

    wav->peak_bps = av_get_bits_per_sample(par->codec_id) / 8;

    if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
        av_log(s, AV_LOG_ERROR,
               "Writing 16 bit peak for 8 bit audio does not make sense\n");
        return AVERROR(EINVAL);
    }

    wav->peak_maxpos = av_mallocz_array(par->channels, sizeof(*wav->peak_maxpos));
    wav->peak_maxneg = av_mallocz_array(par->channels, sizeof(*wav->peak_maxneg));
    wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
    if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
        goto nomem;

    wav->peak_outbuf_size = PEAK_BUFFER_SIZE;

    return 0;

nomem:
    av_log(s, AV_LOG_ERROR, "Out of memory\n");
    return AVERROR(ENOMEM);
}

static void peak_write_frame(AVFormatContext *s)
{
    WAVMuxContext *wav = s->priv_data;
    AVCodecParameters *par = s->streams[0]->codecpar;
    int c;

    if (!wav->peak_output)
        return;

    for (c = 0; c < par->channels; c++) {
        wav->peak_maxneg[c] = -wav->peak_maxneg[c];

        if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
            wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
            wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
        }

        if (wav->peak_ppv == 1)
            wav->peak_maxpos[c] =
                FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);

        if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
            wav->peak_format * wav->peak_ppv) {
            wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
            wav->peak_output = av_realloc(wav->peak_output,
                                          wav->peak_outbuf_size);
            if (!wav->peak_output) {
                av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
                return;
            }
        }

        if (wav->peak_format == PEAK_FORMAT_UINT8) {
            wav->peak_output[wav->peak_outbuf_bytes++] =
                wav->peak_maxpos[c];
            if (wav->peak_ppv == 2) {
                wav->peak_output[wav->peak_outbuf_bytes++] =
                    wav->peak_maxneg[c];
            }
        } else {
            AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
                    wav->peak_maxpos[c]);
            wav->peak_outbuf_bytes += 2;
            if (wav->peak_ppv == 2) {
                AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
                        wav->peak_maxneg[c]);
                wav->peak_outbuf_bytes += 2;
            }
        }
        wav->peak_maxpos[c] = 0;
        wav->peak_maxneg[c] = 0;
    }
    wav->peak_num_frames++;
}

static int peak_write_chunk(AVFormatContext *s)
{
    WAVMuxContext *wav = s->priv_data;
    AVIOContext *pb = s->pb;
    AVCodecParameters *par = s->streams[0]->codecpar;
    int64_t peak = ff_start_tag(s->pb, "levl");
    int64_t now0;
    time_t now_secs;
    char timestamp[28];

    /* Peak frame of incomplete block at end */
    if (wav->peak_block_pos)
        peak_write_frame(s);

    memset(timestamp, 0, sizeof(timestamp));
    if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
        struct tm tmpbuf;
        av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
        now0 = av_gettime();
        now_secs = now0 / 1000000;
        if (strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf))) {
            av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
        } else {
            av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
            return -1;
        }
    }

    avio_wl32(pb, 1);                           /* version */
    avio_wl32(pb, wav->peak_format);            /* 8 or 16 bit */
    avio_wl32(pb, wav->peak_ppv);               /* positive and negative */
    avio_wl32(pb, wav->peak_block_size);        /* frames per value */
    avio_wl32(pb, par->channels);               /* number of channels */
    avio_wl32(pb, wav->peak_num_frames);        /* number of peak frames */
    avio_wl32(pb, -1);                          /* audio sample frame position (not implemented) */
    avio_wl32(pb, 128);                         /* equal to size of header */
    avio_write(pb, timestamp, 28);              /* ASCII time stamp */
    ffio_fill(pb, 0, 60);

    avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);

    ff_end_tag(pb, peak);

    if (!wav->data)
        wav->data = peak;

    return 0;
}

static int wav_write_header(AVFormatContext *s)
{
    WAVMuxContext *wav = s->priv_data;
    AVIOContext *pb = s->pb;
    int64_t fmt;

    if (s->nb_streams != 1) {
        av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
        return AVERROR(EINVAL);
    }

    if (wav->rf64 == RF64_ALWAYS) {
        ffio_wfourcc(pb, "RF64");
        avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
    } else {
        ffio_wfourcc(pb, "RIFF");
        avio_wl32(pb, -1); /* file length */
    }

    ffio_wfourcc(pb, "WAVE");

    if (wav->rf64 != RF64_NEVER) {
        /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
        ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
        avio_wl32(pb, 28); /* chunk size */
        wav->ds64 = avio_tell(pb);
        ffio_fill(pb, 0, 28);
    }

    if (wav->write_peak != PEAK_ONLY) {
        /* format header */
        fmt = ff_start_tag(pb, "fmt ");
        if (ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0) < 0) {
            const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codecpar->codec_id);
            av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
                   desc ? desc->name : "unknown");
            return AVERROR(ENOSYS);
        }
        ff_end_tag(pb, fmt);
    }

    if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
        && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
        wav->fact_pos = ff_start_tag(pb, "fact");
        avio_wl32(pb, 0);
        ff_end_tag(pb, wav->fact_pos);
    }

    if (wav->write_bext)
        bwf_write_bext_chunk(s);

    if (wav->write_peak) {
        int ret;
        if ((ret = peak_init_writer(s)) < 0)
            return ret;
    }

    avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
    wav->maxpts = wav->last_duration = 0;
    wav->minpts = INT64_MAX;

    if (wav->write_peak != PEAK_ONLY) {
        /* info header */
        ff_riff_write_info(s);

        /* data header */
        wav->data = ff_start_tag(pb, "data");
    }

    return 0;
}

static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIOContext *pb  = s->pb;
    WAVMuxContext    *wav = s->priv_data;

    if (wav->write_peak != PEAK_ONLY)
        avio_write(pb, pkt->data, pkt->size);

    if (wav->write_peak) {
        int c = 0;
        int i;
        for (i = 0; i < pkt->size; i += wav->peak_bps) {
            if (wav->peak_bps == 1) {
                wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
                wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
            } else {
                wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
                wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
            }
            if (++c == s->streams[0]->codecpar->channels) {
                c = 0;
                if (++wav->peak_block_pos == wav->peak_block_size) {
                    peak_write_frame(s);
                    wav->peak_block_pos = 0;
                }
            }
        }
    }

    if(pkt->pts != AV_NOPTS_VALUE) {
        wav->minpts        = FFMIN(wav->minpts, pkt->pts);
        wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
        wav->last_duration = pkt->duration;
    } else
        av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
    return 0;
}

static int wav_write_trailer(AVFormatContext *s)
{
    AVIOContext *pb  = s->pb;
    WAVMuxContext    *wav = s->priv_data;
    int64_t file_size, data_size;
    int64_t number_of_samples = 0;
    int rf64 = 0;
    int ret = 0;

    if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
        if (wav->write_peak != PEAK_ONLY && avio_tell(pb) - wav->data < UINT32_MAX) {
            ff_end_tag(pb, wav->data);
        }

        if (wav->write_peak && wav->peak_output) {
            ret = peak_write_chunk(s);
        }

        /* update file size */
        file_size = avio_tell(pb);
        data_size = file_size - wav->data;
        if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
            rf64 = 1;
        } else if (file_size - 8 <= UINT32_MAX) {
            avio_seek(pb, 4, SEEK_SET);
            avio_wl32(pb, (uint32_t)(file_size - 8));
            avio_seek(pb, file_size, SEEK_SET);
        } else {
            av_log(s, AV_LOG_ERROR,
                   "Filesize %"PRId64" invalid for wav, output file will be broken\n",
                   file_size);
        }

        number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
                                       s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
                                       s->streams[0]->time_base.den);

        if(s->streams[0]->codecpar->codec_tag != 0x01) {
            /* Update num_samps in fact chunk */
            avio_seek(pb, wav->fact_pos, SEEK_SET);
            if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
                rf64 = 1;
                avio_wl32(pb, -1);
            } else {
                avio_wl32(pb, number_of_samples);
                avio_seek(pb, file_size, SEEK_SET);
            }
        }

        if (rf64) {
            /* overwrite RIFF with RF64 */
            avio_seek(pb, 0, SEEK_SET);
            ffio_wfourcc(pb, "RF64");
            avio_wl32(pb, -1);

            /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
            avio_seek(pb, wav->ds64 - 8, SEEK_SET);
            ffio_wfourcc(pb, "ds64");
            avio_wl32(pb, 28);                  /* ds64 chunk size */
            avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
            avio_wl64(pb, data_size);           /* data chunk size */
            avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
            avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */

            /* write -1 in data chunk size */
            avio_seek(pb, wav->data - 4, SEEK_SET);
            avio_wl32(pb, -1);

            avio_seek(pb, file_size, SEEK_SET);
        }
    }

    return ret;
}

#define OFFSET(x) offsetof(WAVMuxContext, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
    { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
    { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
    { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
    { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
    { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
    { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
    { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
    { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
    { "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 },
    { "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 },
    { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
    { NULL },
};

static const AVClass wav_muxer_class = {
    .class_name = "WAV muxer",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVOutputFormat ff_wav_muxer = {
    .name              = "wav",
    .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
    .mime_type         = "audio/x-wav",
    .extensions        = "wav",
    .priv_data_size    = sizeof(WAVMuxContext),
    .audio_codec       = AV_CODEC_ID_PCM_S16LE,
    .video_codec       = AV_CODEC_ID_NONE,
    .write_header      = wav_write_header,
    .write_packet      = wav_write_packet,
    .write_trailer     = wav_write_trailer,
    .deinit            = wav_deinit,
    .flags             = AVFMT_TS_NONSTRICT,
    .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
    .priv_class        = &wav_muxer_class,
};
#endif /* CONFIG_WAV_MUXER */

#if CONFIG_W64_MUXER
#include "w64.h"

static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
{
    *pos = avio_tell(pb);

    avio_write(pb, guid, 16);
    avio_wl64(pb, INT64_MAX);
}

static void end_guid(AVIOContext *pb, int64_t start)
{
    int64_t end, pos = avio_tell(pb);

    end = FFALIGN(pos, 8);
    ffio_fill(pb, 0, end - pos);
    avio_seek(pb, start + 16, SEEK_SET);
    avio_wl64(pb, end - start);
    avio_seek(pb, end, SEEK_SET);
}

static int w64_write_header(AVFormatContext *s)
{
    WAVMuxContext *wav = s->priv_data;
    AVIOContext *pb = s->pb;
    int64_t start;
    int ret;

    avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
    avio_wl64(pb, -1);
    avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
    start_guid(pb, ff_w64_guid_fmt, &start);
    if ((ret = ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0)) < 0) {
        AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
        av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
               codec ? codec->name : "NONE");
        return ret;
    }
    end_guid(pb, start);

    if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
        && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
        start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
        avio_wl64(pb, 0);
        end_guid(pb, wav->fact_pos);
    }

    start_guid(pb, ff_w64_guid_data, &wav->data);

    return 0;
}

static int w64_write_trailer(AVFormatContext *s)
{
    AVIOContext    *pb = s->pb;
    WAVMuxContext *wav = s->priv_data;
    int64_t file_size;

    if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
        end_guid(pb, wav->data);

        file_size = avio_tell(pb);
        avio_seek(pb, 16, SEEK_SET);
        avio_wl64(pb, file_size);

        if (s->streams[0]->codecpar->codec_tag != 0x01) {
            int64_t number_of_samples;

            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
                                           s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
                                           s->streams[0]->time_base.den);
            avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
            avio_wl64(pb, number_of_samples);
        }

        avio_seek(pb, file_size, SEEK_SET);
    }

    return 0;
}

AVOutputFormat ff_w64_muxer = {
    .name              = "w64",
    .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
    .extensions        = "w64",
    .priv_data_size    = sizeof(WAVMuxContext),
    .audio_codec       = AV_CODEC_ID_PCM_S16LE,
    .video_codec       = AV_CODEC_ID_NONE,
    .write_header      = w64_write_header,
    .write_packet      = wav_write_packet,
    .write_trailer     = w64_write_trailer,
    .flags             = AVFMT_TS_NONSTRICT,
    .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
};
#endif /* CONFIG_W64_MUXER */