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avformat/mo: Add experimental demuxing support for Opus in ISO BMFF (MP4).

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Based on the draft spec at http://vfrmaniac.fushizen.eu/contents/opus_in_isobmff.html

Signed-off-by: Matthew Gregan <kinetik@flim.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Matthew Gregan 2017-03-16 14:17:21 +13:00 committed by Michael Niedermayer
parent 0c4d208296
commit 3041b5d03b
1 changed files with 49 additions and 0 deletions
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49
libavformat/mov.c
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@ -5264,6 +5264,54 @@ static int cenc_filter(MOVContext *c, MOVStreamContext *sc, int64_t index, uint8
return 0;
}
static int mov_read_dops(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
const int OPUS_SEEK_PREROLL_MS = 80;
AVStream *st;
size_t size;
int16_t pre_skip;
if (c->fc->nb_streams < 1)
return 0;
st = c->fc->streams[c->fc->nb_streams-1];
if ((uint64_t)atom.size > (1<<30) || atom.size < 11)
return AVERROR_INVALIDDATA;
/* Check OpusSpecificBox version. */
if (avio_r8(pb) != 0) {
av_log(c->fc, AV_LOG_ERROR, "unsupported OpusSpecificBox version\n");
return AVERROR_INVALIDDATA;
}
/* OpusSpecificBox size plus magic for Ogg OpusHead header. */
size = atom.size + 8;
if (ff_alloc_extradata(st->codecpar, size))
return AVERROR(ENOMEM);
AV_WL32(st->codecpar->extradata, MKTAG('O','p','u','s'));
AV_WL32(st->codecpar->extradata + 4, MKTAG('H','e','a','d'));
AV_WB8(st->codecpar->extradata + 8, 1); /* OpusHead version */
avio_read(pb, st->codecpar->extradata + 9, size - 9);
/* OpusSpecificBox is stored in big-endian, but OpusHead is
little-endian; aside from the preceeding magic and version they're
otherwise currently identical. Data after output gain at offset 16
doesn't need to be bytewapped. */
pre_skip = AV_RB16(st->codecpar->extradata + 10);
AV_WL16(st->codecpar->extradata + 10, pre_skip);
AV_WL32(st->codecpar->extradata + 12, AV_RB32(st->codecpar->extradata + 12));
AV_WL16(st->codecpar->extradata + 16, AV_RB16(st->codecpar->extradata + 16));
st->codecpar->initial_padding = pre_skip;
st->codecpar->seek_preroll = av_rescale_q(OPUS_SEEK_PREROLL_MS,
(AVRational){1, 1000},
(AVRational){1, 48000});
return 0;
}
static const MOVParseTableEntry mov_default_parse_table[] = {
{ MKTAG('A','C','L','R'), mov_read_aclr },
{ MKTAG('A','P','R','G'), mov_read_avid },
@ -5345,6 +5393,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
{ MKTAG('d','f','L','a'), mov_read_dfla },
{ MKTAG('s','t','3','d'), mov_read_st3d }, /* stereoscopic 3D video box */
{ MKTAG('s','v','3','d'), mov_read_sv3d }, /* spherical video box */
{ MKTAG('d','O','p','s'), mov_read_dops },
{ 0, NULL }
};