From bc010612318ea0bbd31d4b92cbb90ccfbed09631 Mon Sep 17 00:00:00 2001 From: James Almer Date: Thu, 15 Apr 2021 01:28:27 -0300 Subject: avformat/movenc: fix writing dOps atoms Don't blindly copy all bytes in extradata past ChannelMappingFamily. Instead check if ChannelMappingFamily is not 0 and then only write the correct amount of bytes from ChannelMappingTable, as defined in the spec[1]. Fixes part of ticket #9190. [1] https://opus-codec.org/docs/opus_in_isobmff.html#4.3.2 Signed-off-by: James Almer --- libavformat/movenc.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) (limited to 'libavformat/movenc.c') diff --git a/libavformat/movenc.c b/libavformat/movenc.c index 0b620a802d..8e6ed817d8 100644 --- a/libavformat/movenc.c +++ b/libavformat/movenc.c @@ -797,6 +797,7 @@ static int mov_write_dfla_tag(AVIOContext *pb, MOVTrack *track) static int mov_write_dops_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *track) { int64_t pos = avio_tell(pb); + int channels, channel_map; avio_wb32(pb, 0); ffio_wfourcc(pb, "dOps"); avio_w8(pb, 0); /* Version */ @@ -807,12 +808,22 @@ static int mov_write_dops_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *tra /* extradata contains an Ogg OpusHead, other than byte-ordering and OpusHead's preceeding magic/version, OpusSpecificBox is currently identical. */ - avio_w8(pb, AV_RB8(track->par->extradata + 9)); /* OuputChannelCount */ + channels = AV_RB8(track->par->extradata + 9); + channel_map = AV_RB8(track->par->extradata + 18); + + avio_w8(pb, channels); /* OuputChannelCount */ avio_wb16(pb, AV_RL16(track->par->extradata + 10)); /* PreSkip */ avio_wb32(pb, AV_RL32(track->par->extradata + 12)); /* InputSampleRate */ avio_wb16(pb, AV_RL16(track->par->extradata + 16)); /* OutputGain */ + avio_w8(pb, channel_map); /* ChannelMappingFamily */ /* Write the rest of the header out without byte-swapping. */ - avio_write(pb, track->par->extradata + 18, track->par->extradata_size - 18); + if (channel_map) { + if (track->par->extradata_size < 21 + channels) { + av_log(s, AV_LOG_ERROR, "invalid extradata size\n"); + return AVERROR_INVALIDDATA; + } + avio_write(pb, track->par->extradata + 19, 2 + channels); /* ChannelMappingTable */ + } return update_size(pb, pos); } -- cgit v1.2.3