Hi, The attached patch adds demuxing support for Opus audio codec in ISOBMFF/MP4. This is based on v0.6.8 of the draft spec at https://vfrmaniac.fushizen.eu/contents/opus_in_isobmff.html.
Firefox supports demuxing/playback of these files since Firefox 50.
>From 9d6f1b4c12b08cf5fbba61bdeb31c785aa1a6a5f Mon Sep 17 00:00:00 2001 From: Matthew Gregan <kine...@flim.org> Date: Thu, 16 Mar 2017 14:17:21 +1300 Subject: [PATCH 2/2] Add experimental demuxing support for Opus in ISO BMFF (MP4). Based on the draft spec at http://vfrmaniac.fushizen.eu/contents/opus_in_isobmff.html Signed-off-by: Matthew Gregan <kine...@flim.org> --- libavformat/mov.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/libavformat/mov.c b/libavformat/mov.c index d5c3949050..324d628985 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -5246,6 +5246,54 @@ 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 + 16; + + 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 - 17); + + /* 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 }, @@ -5327,6 +5375,7 @@ 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 } }; -- 2.12.0
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