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avformat/wavdec: add support for chapters 

Support parsing 'cue ' and 'adtl' chunks.
This commit is contained in:
Paul B Mahol 2020-08-31 14:18:37 +02:00
parent 97c73ba565
commit 2a14d55a7c
1 changed files with 46 additions and 0 deletions
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46
libavformat/wavdec.c
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@ -500,6 +500,7 @@ static int wav_read_header(AVFormatContext *s)
wav->smv_cur_pt = 0;
goto break_loop;
case MKTAG('L', 'I', 'S', 'T'):
case MKTAG('l', 'i', 's', 't'):
if (size < 4) {
av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
return AVERROR_INVALIDDATA;
@ -507,6 +508,33 @@ static int wav_read_header(AVFormatContext *s)
switch (avio_rl32(pb)) {
case MKTAG('I', 'N', 'F', 'O'):
ff_read_riff_info(s, size - 4);
break;
case MKTAG('a', 'd', 't', 'l'):
if (s->nb_chapters > 0) {
while (avio_tell(pb) < next_tag_ofs &&
!avio_feof(pb)) {
char cue_label[512];
unsigned id, sub_size;
if (avio_rl32(pb) != MKTAG('l', 'a', 'b', 'l'))
break;
sub_size = avio_rl32(pb);
if (sub_size < 5)
break;
id = avio_rl32(pb);
avio_get_str(pb, sub_size - 4, cue_label, sizeof(cue_label));
avio_skip(pb, avio_tell(pb) & 1);
for (int i = 0; i < s->nb_chapters; i++) {
if (s->chapters[i]->id == id) {
av_dict_set(&s->chapters[i]->metadata, "title", cue_label, 0);
break;
}
}
}
}
break;
}
break;
case MKTAG('I', 'D', '3', ' '):
@ -521,6 +549,24 @@ static int wav_read_header(AVFormatContext *s)
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
}
break;
case MKTAG('c', 'u', 'e', ' '):
if (size >= 4 && got_fmt && st->codecpar->sample_rate > 0) {
AVRational tb = {1, st->codecpar->sample_rate};
unsigned nb_cues = avio_rl32(pb);
if (size >= nb_cues * 24LL + 4LL) {
for (int i = 0; i < nb_cues; i++) {
unsigned offset, id = avio_rl32(pb);
avio_skip(pb, 16);
offset = avio_rl32(pb);
if (!avpriv_new_chapter(s, id, tb, offset, AV_NOPTS_VALUE, NULL))
return AVERROR(ENOMEM);
}
}
}
break;
}
/* seek to next tag unless we know that we'll run into EOF */