3 * Copyright (c) 2001, 2002 Fabrice Bellard
7 * Copyright (c) 2009 Daniel Verkamp
9 * This file is part of FFmpeg.
11 * FFmpeg is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU Lesser General Public
13 * License as published by the Free Software Foundation; either
14 * version 2.1 of the License, or (at your option) any later version.
16 * FFmpeg is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * Lesser General Public License for more details.
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with FFmpeg; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "libavutil/avassert.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/intreadwrite.h"
31 #include "libavutil/log.h"
32 #include "libavutil/mathematics.h"
33 #include "libavutil/opt.h"
36 #include "avio_internal.h"
44 typedef struct WAVDemuxContext {
50 int smv_frames_per_jpeg;
59 int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended
60 int rifx; // RIFX: integer byte order for parameters is big endian
63 #if CONFIG_WAV_DEMUXER
65 static int64_t next_tag(AVIOContext *pb, uint32_t *tag, int big_endian)
75 /* RIFF chunks are always at even offsets relative to where they start. */
76 static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)
78 offset += offset < INT64_MAX && offset + wav->unaligned & 1;
80 return avio_seek(s, offset, whence);
83 /* return the size of the found tag */
84 static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)
92 size = next_tag(pb, &tag, wav->rifx);
95 wav_seek_tag(wav, pb, size, SEEK_CUR);
100 static int wav_probe(AVProbeData *p)
102 /* check file header */
103 if (p->buf_size <= 32)
105 if (!memcmp(p->buf + 8, "WAVE", 4)) {
106 if (!memcmp(p->buf, "RIFF", 4) || !memcmp(p->buf, "RIFX", 4))
107 /* Since the ACT demuxer has a standard WAV header at the top of
108 * its own, the returned score is decreased to avoid a probe
109 * conflict between ACT and WAV. */
110 return AVPROBE_SCORE_MAX - 1;
111 else if (!memcmp(p->buf, "RF64", 4) &&
112 !memcmp(p->buf + 12, "ds64", 4))
113 return AVPROBE_SCORE_MAX;
118 static void handle_stream_probing(AVStream *st)
120 if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {
121 st->request_probe = AVPROBE_SCORE_EXTENSION;
122 st->probe_packets = FFMIN(st->probe_packets, 32);
126 static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
128 AVIOContext *pb = s->pb;
129 WAVDemuxContext *wav = s->priv_data;
132 /* parse fmt header */
133 *st = avformat_new_stream(s, NULL);
135 return AVERROR(ENOMEM);
137 ret = ff_get_wav_header(s, pb, (*st)->codec, size, wav->rifx);
140 handle_stream_probing(*st);
142 (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
144 avpriv_set_pts_info(*st, 64, 1, (*st)->codec->sample_rate);
149 static int wav_parse_xma2_tag(AVFormatContext *s, int64_t size, AVStream **st)
151 AVIOContext *pb = s->pb;
152 int num_streams, i, channels = 0;
155 return AVERROR_INVALIDDATA;
157 *st = avformat_new_stream(s, NULL);
159 return AVERROR(ENOMEM);
161 (*st)->codec->codec_type = AVMEDIA_TYPE_AUDIO;
162 (*st)->codec->codec_id = AV_CODEC_ID_XMA2;
163 (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
166 num_streams = avio_r8(pb);
167 if (size < 40 + num_streams * 4)
168 return AVERROR_INVALIDDATA;
170 (*st)->codec->sample_rate = avio_rb32(pb);
172 (*st)->duration = avio_rb32(pb);
175 for (i = 0; i < num_streams; i++) {
176 channels += avio_r8(pb);
179 (*st)->codec->channels = channels;
181 if ((*st)->codec->channels <= 0 || (*st)->codec->sample_rate <= 0)
182 return AVERROR_INVALIDDATA;
184 avpriv_set_pts_info(*st, 64, 1, (*st)->codec->sample_rate);
185 if (ff_alloc_extradata((*st)->codec, 34))
186 return AVERROR(ENOMEM);
187 memset((*st)->codec->extradata, 0, 34);
192 static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
198 av_assert0(length <= sizeof(temp));
199 if ((ret = avio_read(s->pb, temp, length)) < 0)
205 return av_dict_set(&s->metadata, key, temp, 0);
210 static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
212 char temp[131], *coding_history;
214 uint64_t time_reference;
215 int64_t umid_parts[8], umid_mask = 0;
217 if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
218 (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
219 (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
220 (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
221 (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
224 time_reference = avio_rl64(s->pb);
225 snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
226 if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
229 /* check if version is >= 1, in which case an UMID may be present */
230 if (avio_rl16(s->pb) >= 1) {
231 for (x = 0; x < 8; x++)
232 umid_mask |= umid_parts[x] = avio_rb64(s->pb);
235 /* the string formatting below is per SMPTE 330M-2004 Annex C */
236 if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
237 umid_parts[6] == 0 && umid_parts[7] == 0) {
239 snprintf(temp, sizeof(temp),
240 "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
241 umid_parts[0], umid_parts[1],
242 umid_parts[2], umid_parts[3]);
245 snprintf(temp, sizeof(temp),
246 "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
247 "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
248 umid_parts[0], umid_parts[1],
249 umid_parts[2], umid_parts[3],
250 umid_parts[4], umid_parts[5],
251 umid_parts[6], umid_parts[7]);
254 if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
258 avio_skip(s->pb, 190);
260 avio_skip(s->pb, 254);
263 /* CodingHistory present */
266 if (!(coding_history = av_malloc(size + 1)))
267 return AVERROR(ENOMEM);
269 if ((ret = avio_read(s->pb, coding_history, size)) < 0)
272 coding_history[size] = 0;
273 if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
274 AV_DICT_DONT_STRDUP_VAL)) < 0)
281 static const AVMetadataConv wav_metadata_conv[] = {
282 { "description", "comment" },
283 { "originator", "encoded_by" },
284 { "origination_date", "date" },
285 { "origination_time", "creation_time" },
290 static int wav_read_header(AVFormatContext *s)
292 int64_t size, av_uninit(data_size);
293 int64_t sample_count = 0;
297 AVIOContext *pb = s->pb;
299 WAVDemuxContext *wav = s->priv_data;
300 int ret, got_fmt = 0, got_xma2 = 0;
301 int64_t next_tag_ofs, data_ofs = -1;
303 wav->unaligned = avio_tell(s->pb) & 1;
305 wav->smv_data_ofs = -1;
310 case MKTAG('R', 'I', 'F', 'F'):
312 case MKTAG('R', 'I', 'F', 'X'):
315 case MKTAG('R', 'F', '6', '4'):
319 av_get_codec_tag_string(start_code, sizeof(start_code), tag);
320 av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n", start_code);
321 return AVERROR_INVALIDDATA;
324 /* read chunk size */
328 if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
329 av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
330 return AVERROR_INVALIDDATA;
334 if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
335 return AVERROR_INVALIDDATA;
336 size = avio_rl32(pb);
338 return AVERROR_INVALIDDATA;
339 avio_rl64(pb); /* RIFF size */
341 data_size = avio_rl64(pb);
342 sample_count = avio_rl64(pb);
344 if (data_size < 0 || sample_count < 0) {
345 av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
346 "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
347 data_size, sample_count);
348 return AVERROR_INVALIDDATA;
350 avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
356 size = next_tag(pb, &tag, wav->rifx);
357 next_tag_ofs = avio_tell(pb) + size;
363 case MKTAG('f', 'm', 't', ' '):
364 /* only parse the first 'fmt ' tag found */
365 if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
368 av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
372 case MKTAG('X', 'M', 'A', '2'):
373 /* only parse the first 'XMA2' tag found */
374 if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, &st)) < 0) {
377 av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
381 case MKTAG('d', 'a', 't', 'a'):
382 if (!pb->seekable && !got_fmt && !got_xma2) {
383 av_log(s, AV_LOG_ERROR,
384 "found no 'fmt ' tag before the 'data' tag\n");
385 return AVERROR_INVALIDDATA;
389 next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
390 } else if (size != 0xFFFFFFFF) {
392 next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
394 av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
395 "file may be invalid\n");
397 next_tag_ofs = wav->data_end = INT64_MAX;
400 data_ofs = avio_tell(pb);
402 /* don't look for footer metadata if we can't seek or if we don't
403 * know where the data tag ends
405 if (!pb->seekable || (!rf64 && !size))
408 case MKTAG('f', 'a', 'c', 't'):
410 sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
412 case MKTAG('b', 'e', 'x', 't'):
413 if ((ret = wav_parse_bext_tag(s, size)) < 0)
416 case MKTAG('S','M','V','0'):
418 av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
419 return AVERROR_INVALIDDATA;
421 // SMV file, a wav file with video appended.
422 if (size != MKTAG('0','2','0','0')) {
423 av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
426 av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
427 wav->smv_given_first = 0;
428 vst = avformat_new_stream(s, NULL);
430 return AVERROR(ENOMEM);
433 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
434 vst->codec->codec_id = AV_CODEC_ID_SMVJPEG;
435 vst->codec->width = avio_rl24(pb);
436 vst->codec->height = avio_rl24(pb);
437 if (ff_alloc_extradata(vst->codec, 4)) {
438 av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
439 return AVERROR(ENOMEM);
441 size = avio_rl24(pb);
442 wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
444 wav->smv_block_size = avio_rl24(pb);
445 avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
446 vst->duration = avio_rl24(pb);
449 wav->smv_frames_per_jpeg = avio_rl24(pb);
450 if (wav->smv_frames_per_jpeg > 65536) {
451 av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
452 return AVERROR_INVALIDDATA;
454 AV_WL32(vst->codec->extradata, wav->smv_frames_per_jpeg);
457 case MKTAG('L', 'I', 'S', 'T'):
459 av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
460 return AVERROR_INVALIDDATA;
462 switch (avio_rl32(pb)) {
463 case MKTAG('I', 'N', 'F', 'O'):
464 ff_read_riff_info(s, size - 4);
469 /* seek to next tag unless we know that we'll run into EOF */
470 if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
471 wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
477 if (!got_fmt && !got_xma2) {
478 av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
479 return AVERROR_INVALIDDATA;
483 av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
484 return AVERROR_INVALIDDATA;
487 avio_seek(pb, data_ofs, SEEK_SET);
489 if (data_size > (INT64_MAX>>3)) {
490 av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
494 if ( st->codec->bit_rate > 0 && data_size > 0
495 && st->codec->sample_rate > 0
496 && sample_count > 0 && st->codec->channels > 1
497 && sample_count % st->codec->channels == 0) {
498 if (fabs(8.0 * data_size * st->codec->channels * st->codec->sample_rate /
499 sample_count /st->codec->bit_rate - 1.0) < 0.3)
500 sample_count /= st->codec->channels;
503 if ( data_size > 0 && sample_count && st->codec->channels
504 && (data_size << 3) / sample_count / st->codec->channels > st->codec->bits_per_coded_sample + 1) {
505 av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
509 /* G.729 hack (for Ticket4577)
510 * FIXME: Come up with cleaner, more general solution */
511 if (st->codec->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
512 av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
516 if (!sample_count || av_get_exact_bits_per_sample(st->codec->codec_id) > 0)
517 if ( st->codec->channels
519 && av_get_bits_per_sample(st->codec->codec_id)
520 && wav->data_end <= avio_size(pb))
521 sample_count = (data_size << 3)
523 (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
526 st->duration = sample_count;
528 ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
529 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
535 * Find chunk with w64 GUID by skipping over other chunks.
536 * @return the size of the found chunk
538 static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
543 while (!avio_feof(pb)) {
544 avio_read(pb, guid, 16);
545 size = avio_rl64(pb);
547 return AVERROR_INVALIDDATA;
548 if (!memcmp(guid, guid1, 16))
550 avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
555 #define MAX_SIZE 4096
557 static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
562 WAVDemuxContext *wav = s->priv_data;
564 if (CONFIG_SPDIF_DEMUXER && wav->spdif == 0 &&
565 s->streams[0]->codec->codec_tag == 1) {
566 enum AVCodecID codec;
567 ret = ff_spdif_probe(s->pb->buffer, s->pb->buf_end - s->pb->buffer,
569 if (ret > AVPROBE_SCORE_EXTENSION) {
570 s->streams[0]->codec->codec_id = codec;
576 if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
577 return ff_spdif_read_packet(s, pkt);
579 if (wav->smv_data_ofs > 0) {
580 int64_t audio_dts, video_dts;
582 audio_dts = (int32_t)s->streams[0]->cur_dts;
583 video_dts = (int32_t)s->streams[1]->cur_dts;
585 if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
586 /*We always return a video frame first to get the pixel format first*/
587 wav->smv_last_stream = wav->smv_given_first ?
588 av_compare_ts(video_dts, s->streams[1]->time_base,
589 audio_dts, s->streams[0]->time_base) > 0 : 0;
590 wav->smv_given_first = 1;
592 wav->smv_last_stream = !wav->smv_last_stream;
593 wav->smv_last_stream |= wav->audio_eof;
594 wav->smv_last_stream &= !wav->smv_eof;
595 if (wav->smv_last_stream) {
596 uint64_t old_pos = avio_tell(s->pb);
597 uint64_t new_pos = wav->smv_data_ofs +
598 wav->smv_block * wav->smv_block_size;
599 if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
603 size = avio_rl24(s->pb);
604 ret = av_get_packet(s->pb, pkt, size);
608 pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
610 if (wav->smv_frames_per_jpeg > 0)
611 wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
612 if (!wav->smv_cur_pt)
615 pkt->stream_index = 1;
617 avio_seek(s->pb, old_pos, SEEK_SET);
618 if (ret == AVERROR_EOF) {
628 left = wav->data_end - avio_tell(s->pb);
629 if (wav->ignore_length)
632 if (CONFIG_W64_DEMUXER && wav->w64)
633 left = find_guid(s->pb, ff_w64_guid_data) - 24;
635 left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
638 if (wav->smv_data_ofs > 0 && !wav->smv_eof)
642 wav->data_end = avio_tell(s->pb) + left;
646 if (st->codec->block_align > 1) {
647 if (size < st->codec->block_align)
648 size = st->codec->block_align;
649 size = (size / st->codec->block_align) * st->codec->block_align;
651 size = FFMIN(size, left);
652 ret = av_get_packet(s->pb, pkt, size);
655 pkt->stream_index = 0;
660 static int wav_read_seek(AVFormatContext *s,
661 int stream_index, int64_t timestamp, int flags)
663 WAVDemuxContext *wav = s->priv_data;
667 if (wav->smv_data_ofs > 0) {
668 int64_t smv_timestamp = timestamp;
669 if (stream_index == 0)
670 smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
672 timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
673 if (wav->smv_frames_per_jpeg > 0) {
674 wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
675 wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
680 switch (st->codec->codec_id) {
681 case AV_CODEC_ID_MP2:
682 case AV_CODEC_ID_MP3:
683 case AV_CODEC_ID_AC3:
684 case AV_CODEC_ID_DTS:
685 /* use generic seeking with dynamically generated indexes */
690 return ff_pcm_read_seek(s, stream_index, timestamp, flags);
693 #define OFFSET(x) offsetof(WAVDemuxContext, x)
694 #define DEC AV_OPT_FLAG_DECODING_PARAM
695 static const AVOption demux_options[] = {
696 { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
700 static const AVClass wav_demuxer_class = {
701 .class_name = "WAV demuxer",
702 .item_name = av_default_item_name,
703 .option = demux_options,
704 .version = LIBAVUTIL_VERSION_INT,
706 AVInputFormat ff_wav_demuxer = {
708 .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
709 .priv_data_size = sizeof(WAVDemuxContext),
710 .read_probe = wav_probe,
711 .read_header = wav_read_header,
712 .read_packet = wav_read_packet,
713 .read_seek = wav_read_seek,
714 .flags = AVFMT_GENERIC_INDEX,
715 .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
716 .priv_class = &wav_demuxer_class,
718 #endif /* CONFIG_WAV_DEMUXER */
720 #if CONFIG_W64_DEMUXER
721 static int w64_probe(AVProbeData *p)
723 if (p->buf_size <= 40)
725 if (!memcmp(p->buf, ff_w64_guid_riff, 16) &&
726 !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
727 return AVPROBE_SCORE_MAX;
732 static int w64_read_header(AVFormatContext *s)
734 int64_t size, data_ofs = 0;
735 AVIOContext *pb = s->pb;
736 WAVDemuxContext *wav = s->priv_data;
741 avio_read(pb, guid, 16);
742 if (memcmp(guid, ff_w64_guid_riff, 16))
743 return AVERROR_INVALIDDATA;
745 /* riff + wave + fmt + sizes */
746 if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
747 return AVERROR_INVALIDDATA;
749 avio_read(pb, guid, 16);
750 if (memcmp(guid, ff_w64_guid_wave, 16)) {
751 av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
752 return AVERROR_INVALIDDATA;
757 st = avformat_new_stream(s, NULL);
759 return AVERROR(ENOMEM);
761 while (!avio_feof(pb)) {
762 if (avio_read(pb, guid, 16) != 16)
764 size = avio_rl64(pb);
765 if (size <= 24 || INT64_MAX - size < avio_tell(pb))
766 return AVERROR_INVALIDDATA;
768 if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
769 /* subtract chunk header size - normal wav file doesn't count it */
770 ret = ff_get_wav_header(s, pb, st->codec, size - 24, 0);
773 avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
775 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
776 } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
779 samples = avio_rl64(pb);
781 st->duration = samples;
782 } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
783 wav->data_end = avio_tell(pb) + size - 24;
785 data_ofs = avio_tell(pb);
789 avio_skip(pb, size - 24);
790 } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
791 int64_t start, end, cur;
792 uint32_t count, chunk_size, i;
794 start = avio_tell(pb);
795 end = start + FFALIGN(size, INT64_C(8)) - 24;
796 count = avio_rl32(pb);
798 for (i = 0; i < count; i++) {
799 char chunk_key[5], *value;
801 if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
805 avio_read(pb, chunk_key, 4);
806 chunk_size = avio_rl32(pb);
808 value = av_mallocz(chunk_size + 1);
810 return AVERROR(ENOMEM);
812 ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
813 avio_skip(pb, chunk_size - ret);
815 av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
818 avio_skip(pb, end - avio_tell(pb));
820 av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
821 avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
828 ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
829 ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
831 handle_stream_probing(st);
832 st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
834 avio_seek(pb, data_ofs, SEEK_SET);
839 AVInputFormat ff_w64_demuxer = {
841 .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
842 .priv_data_size = sizeof(WAVDemuxContext),
843 .read_probe = w64_probe,
844 .read_header = w64_read_header,
845 .read_packet = wav_read_packet,
846 .read_seek = wav_read_seek,
847 .flags = AVFMT_GENERIC_INDEX,
848 .codec_tag = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
850 #endif /* CONFIG_W64_DEMUXER */