aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/wav.c
blob: c01121f9dbd9d3a01dedd15d6126cf71b85facfb (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
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
/*
 * WAV muxer and demuxer
 * Copyright (c) 2001, 2002 Fabrice Bellard
 *
 * Sony Wave64 demuxer
 * RF64 demuxer
 * Copyright (c) 2009 Daniel Verkamp
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/avassert.h"
#include "libavutil/dict.h"
#include "libavutil/log.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "pcm.h"
#include "riff.h"
#include "avio.h"
#include "metadata.h"

typedef struct {
    const AVClass *class;
    int64_t data;
    int64_t data_end;
    int64_t minpts;
    int64_t maxpts;
    int last_duration;
    int w64;
    int write_bext;
} WAVContext;

#if CONFIG_WAV_MUXER
static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
{
    AVDictionaryEntry *tag;
    int 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)) {
        unsigned char umidpart_str[17] = {0};
        int i;
        uint64_t umidpart;
        int 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 int wav_write_header(AVFormatContext *s)
{
    WAVContext *wav = s->priv_data;
    AVIOContext *pb = s->pb;
    int64_t fmt, fact;

    ffio_wfourcc(pb, "RIFF");
    avio_wl32(pb, 0); /* file length */
    ffio_wfourcc(pb, "WAVE");

    /* format header */
    fmt = ff_start_tag(pb, "fmt ");
    if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
        av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
               s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
        return -1;
    }
    ff_end_tag(pb, fmt);

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

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

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

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

    avio_flush(pb);

    return 0;
}

static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIOContext *pb  = s->pb;
    WAVContext    *wav = s->priv_data;
    avio_write(pb, pkt->data, pkt->size);
    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;
    WAVContext    *wav = s->priv_data;
    int64_t file_size;

    avio_flush(pb);

    if (s->pb->seekable) {
        ff_end_tag(pb, wav->data);

        /* update file size */
        file_size = avio_tell(pb);
        avio_seek(pb, 4, SEEK_SET);
        avio_wl32(pb, (uint32_t)(file_size - 8));
        avio_seek(pb, file_size, SEEK_SET);

        avio_flush(pb);

        if(s->streams[0]->codec->codec_tag != 0x01) {
            /* Update num_samps in fact chunk */
            int number_of_samples;
            number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
                                           s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
                                           s->streams[0]->time_base.den);
            avio_seek(pb, wav->data-12, SEEK_SET);
            avio_wl32(pb, number_of_samples);
            avio_seek(pb, file_size, SEEK_SET);
            avio_flush(pb);
        }
    }
    return 0;
}

#define OFFSET(x) offsetof(WAVContext, x)
#define ENC AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { 0 }, 0, 1, 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 format"),
    .mime_type         = "audio/x-wav",
    .extensions        = "wav",
    .priv_data_size    = sizeof(WAVContext),
    .audio_codec       = CODEC_ID_PCM_S16LE,
    .video_codec       = CODEC_ID_NONE,
    .write_header      = wav_write_header,
    .write_packet      = wav_write_packet,
    .write_trailer     = wav_write_trailer,
    .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_WAV_DEMUXER

static int64_t next_tag(AVIOContext *pb, uint32_t *tag)
{
    *tag = avio_rl32(pb);
    return avio_rl32(pb);
}

/* return the size of the found tag */
static int64_t find_tag(AVIOContext *pb, uint32_t tag1)
{
    unsigned int tag;
    int64_t size;

    for (;;) {
        if (pb->eof_reached)
            return -1;
        size = next_tag(pb, &tag);
        if (tag == tag1)
            break;
        avio_skip(pb, size);
    }
    return size;
}

static int wav_probe(AVProbeData *p)
{
    /* check file header */
    if (p->buf_size <= 32)
        return 0;
    if (!memcmp(p->buf + 8, "WAVE", 4)) {
        if (!memcmp(p->buf, "RIFF", 4))
            /*
              Since ACT demuxer has standard WAV header at top of it's own,
              returning score is decreased to avoid probe conflict
              between ACT and WAV.
            */
            return AVPROBE_SCORE_MAX - 1;
        else if (!memcmp(p->buf,      "RF64", 4) &&
                 !memcmp(p->buf + 12, "ds64", 4))
            return AVPROBE_SCORE_MAX;
    }
    return 0;
}

static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
{
    AVIOContext *pb = s->pb;
    int ret;

    /* parse fmt header */
    *st = avformat_new_stream(s, NULL);
    if (!*st)
        return AVERROR(ENOMEM);

    ret = ff_get_wav_header(pb, (*st)->codec, size);
    if (ret < 0)
        return ret;
    (*st)->need_parsing = AVSTREAM_PARSE_FULL;

    avpriv_set_pts_info(*st, 64, 1, (*st)->codec->sample_rate);

    return 0;
}

static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
                                        int length)
{
    char temp[257];
    int ret;

    av_assert0(length <= sizeof(temp));
    if ((ret = avio_read(s->pb, temp, length)) < 0)
        return ret;

    temp[length] = 0;

    if (strlen(temp))
        return av_dict_set(&s->metadata, key, temp, 0);

    return 0;
}

static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
{
    char temp[131], *coding_history;
    int ret, x;
    uint64_t time_reference;
    int64_t umid_parts[8], umid_mask = 0;

    if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
        (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
        (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
        (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
        (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
        return ret;

    time_reference = avio_rl64(s->pb);
    snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
    if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
        return ret;

    /* check if version is >= 1, in which case an UMID may be present */
    if (avio_rl16(s->pb) >= 1) {
        for (x = 0; x < 8; x++)
            umid_mask |= umid_parts[x] = avio_rb64(s->pb);

        if (umid_mask) {
            /* the string formatting below is per SMPTE 330M-2004 Annex C */
            if (umid_parts[4] == 0 && umid_parts[5] == 0 && umid_parts[6] == 0 && umid_parts[7] == 0) {
                /* basic UMID */
                snprintf(temp, sizeof(temp), "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
                         umid_parts[0], umid_parts[1], umid_parts[2], umid_parts[3]);
            } else {
                /* extended UMID */
                snprintf(temp, sizeof(temp), "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
                                             "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
                         umid_parts[0], umid_parts[1], umid_parts[2], umid_parts[3],
                         umid_parts[4], umid_parts[5], umid_parts[6], umid_parts[7]);
            }

            if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
                return ret;
        }

        avio_skip(s->pb, 190);
    } else
        avio_skip(s->pb, 254);

    if (size > 602) {
        /* CodingHistory present */
        size -= 602;

        if (!(coding_history = av_malloc(size+1)))
            return AVERROR(ENOMEM);

        if ((ret = avio_read(s->pb, coding_history, size)) < 0)
            return ret;

        coding_history[size] = 0;
        if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
                               AV_DICT_DONT_STRDUP_VAL)) < 0)
            return ret;
    }

    return 0;
}

static const AVMetadataConv wav_metadata_conv[] = {
    {"description",      "comment"      },
    {"originator",       "encoded_by"   },
    {"origination_date", "date"         },
    {"origination_time", "creation_time"},
    {0},
};

/* wav input */
static int wav_read_header(AVFormatContext *s)
{
    int64_t size, av_uninit(data_size);
    int64_t sample_count=0;
    int rf64;
    uint32_t tag, list_type;
    AVIOContext *pb = s->pb;
    AVStream *st;
    WAVContext *wav = s->priv_data;
    int ret, got_fmt = 0;
    int64_t next_tag_ofs, data_ofs = -1;

    /* check RIFF header */
    tag = avio_rl32(pb);

    rf64 = tag == MKTAG('R', 'F', '6', '4');
    if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))
        return -1;
    avio_rl32(pb); /* file size */
    tag = avio_rl32(pb);
    if (tag != MKTAG('W', 'A', 'V', 'E'))
        return -1;

    if (rf64) {
        if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
            return -1;
        size = avio_rl32(pb);
        if (size < 16)
            return -1;
        avio_rl64(pb); /* RIFF size */
        data_size = avio_rl64(pb);
        sample_count = avio_rl64(pb);
        if (data_size < 0 || sample_count < 0) {
            av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
                   "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
                   data_size, sample_count);
            return AVERROR_INVALIDDATA;
        }
        avio_skip(pb, size - 16); /* skip rest of ds64 chunk */
    }

    for (;;) {
        size = next_tag(pb, &tag);
        next_tag_ofs = avio_tell(pb) + size;

        if (pb->eof_reached)
            break;

        switch (tag) {
        case MKTAG('f', 'm', 't', ' '):
            /* only parse the first 'fmt ' tag found */
            if (!got_fmt && (ret = wav_parse_fmt_tag(s, size, &st) < 0)) {
                return ret;
            } else if (got_fmt)
                av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");

            got_fmt = 1;
            break;
        case MKTAG('d', 'a', 't', 'a'):
            if (!got_fmt) {
                av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'data' tag\n");
                return AVERROR_INVALIDDATA;
            }

            if (rf64) {
                next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
            } else {
                data_size = size;
                next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
            }

            data_ofs = avio_tell(pb);

            /* don't look for footer metadata if we can't seek or if we don't
             * know where the data tag ends
             */
            if (!pb->seekable || (!rf64 && !size))
                goto break_loop;
            break;
        case MKTAG('f','a','c','t'):
            if (!sample_count)
                sample_count = avio_rl32(pb);
            break;
        case MKTAG('b','e','x','t'):
            if ((ret = wav_parse_bext_tag(s, size)) < 0)
                return ret;
            break;
        case MKTAG('L', 'I', 'S', 'T'):
            list_type = avio_rl32(pb);
            if (size <= 4) {
                av_log(s, AV_LOG_ERROR, "too short LIST");
                return AVERROR_INVALIDDATA;
            }
            switch (list_type) {
            case MKTAG('I', 'N', 'F', 'O'):
                if ((ret = ff_read_riff_info(s, size - 4)) < 0)
                    return ret;
            }
            break;
        }

        /* seek to next tag unless we know that we'll run into EOF */
        if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
            avio_seek(pb, next_tag_ofs, SEEK_SET) < 0) {
            break;
        }
    }
break_loop:
    if (data_ofs < 0) {
        av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
        return AVERROR_INVALIDDATA;
    }

    avio_seek(pb, data_ofs, SEEK_SET);

    if (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id))
        sample_count = (data_size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
    if (sample_count)
        st->duration = sample_count;

    ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
    ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);

    return 0;
}

/** Find chunk with w64 GUID by skipping over other chunks
 * @return the size of the found chunk
 */
static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
{
    uint8_t guid[16];
    int64_t size;

    while (!pb->eof_reached) {
        avio_read(pb, guid, 16);
        size = avio_rl64(pb);
        if (size <= 24)
            return -1;
        if (!memcmp(guid, guid1, 16))
            return size;
        avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
    }
    return -1;
}

static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };

#define MAX_SIZE 4096

static int wav_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
{
    int ret, size;
    int64_t left;
    AVStream *st;
    WAVContext *wav = s->priv_data;

    st = s->streams[0];

    left = wav->data_end - avio_tell(s->pb);
    if (left <= 0){
        if (CONFIG_W64_DEMUXER && wav->w64)
            left = find_guid(s->pb, guid_data) - 24;
        else
            left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
        if (left < 0)
            return AVERROR_EOF;
        wav->data_end= avio_tell(s->pb) + left;
    }

    size = MAX_SIZE;
    if (st->codec->block_align > 1) {
        if (size < st->codec->block_align)
            size = st->codec->block_align;
        size = (size / st->codec->block_align) * st->codec->block_align;
    }
    size = FFMIN(size, left);
    ret  = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;
    pkt->stream_index = 0;

    return ret;
}

static int wav_read_seek(AVFormatContext *s,
                         int stream_index, int64_t timestamp, int flags)
{
    AVStream *st;

    st = s->streams[0];
    switch (st->codec->codec_id) {
    case CODEC_ID_MP2:
    case CODEC_ID_MP3:
    case CODEC_ID_AC3:
    case CODEC_ID_DTS:
        /* use generic seeking with dynamically generated indexes */
        return -1;
    default:
        break;
    }
    return ff_pcm_read_seek(s, stream_index, timestamp, flags);
}

AVInputFormat ff_wav_demuxer = {
    .name           = "wav",
    .long_name      = NULL_IF_CONFIG_SMALL("WAV format"),
    .priv_data_size = sizeof(WAVContext),
    .read_probe     = wav_probe,
    .read_header    = wav_read_header,
    .read_packet    = wav_read_packet,
    .read_seek      = wav_read_seek,
    .flags          = AVFMT_GENERIC_INDEX,
    .codec_tag      = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
};
#endif /* CONFIG_WAV_DEMUXER */


#if CONFIG_W64_DEMUXER
static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
    0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };

static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };

static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
    0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };

static int w64_probe(AVProbeData *p)
{
    if (p->buf_size <= 40)
        return 0;
    if (!memcmp(p->buf,      guid_riff, 16) &&
        !memcmp(p->buf + 24, guid_wave, 16))
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

static int w64_read_header(AVFormatContext *s)
{
    int64_t size;
    AVIOContext *pb  = s->pb;
    WAVContext    *wav = s->priv_data;
    AVStream *st;
    uint8_t guid[16];
    int ret;

    avio_read(pb, guid, 16);
    if (memcmp(guid, guid_riff, 16))
        return -1;

    if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
        return -1;

    avio_read(pb, guid, 16);
    if (memcmp(guid, guid_wave, 16)) {
        av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
        return -1;
    }

    size = find_guid(pb, guid_fmt);
    if (size < 0) {
        av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
        return -1;
    }

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    /* subtract chunk header size - normal wav file doesn't count it */
    ret = ff_get_wav_header(pb, st->codec, size - 24);
    if (ret < 0)
        return ret;
    avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);

    st->need_parsing = AVSTREAM_PARSE_FULL;

    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);

    size = find_guid(pb, guid_data);
    if (size < 0) {
        av_log(s, AV_LOG_ERROR, "could not find data guid\n");
        return -1;
    }
    wav->data_end = avio_tell(pb) + size - 24;
    wav->w64      = 1;

    return 0;
}

AVInputFormat ff_w64_demuxer = {
    .name           = "w64",
    .long_name      = NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
    .priv_data_size = sizeof(WAVContext),
    .read_probe     = w64_probe,
    .read_header    = w64_read_header,
    .read_packet    = wav_read_packet,
    .read_seek      = wav_read_seek,
    .flags          = AVFMT_GENERIC_INDEX,
    .codec_tag      = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
};
#endif /* CONFIG_W64_DEMUXER */