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libavcodec/opus: Add channel mapping 2 to extradata parser

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This allows libavcodec/opus to demux ambisonics in an ogg/opus container.
Channel mapping family 2 is being added in this standards track IETF draft:
tools.ietf.org/html/draft-ietf-codec-ambisonics-00

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Graczyk 2016-09-01 11:17:30 -07:00 committed by Michael Niedermayer
parent a2c912c3b6
commit be07c25896
1 changed files with 10 additions and 1 deletions
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11
libavcodec/opus.c
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@ -347,7 +347,7 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
streams = 1;
stereo_streams = channels - 1;
channel_map = default_channel_map;
} else if (map_type == 1 || map_type == 255) {
} else if (map_type == 1 || map_type == 2 || map_type == 255) {
if (extradata_size < 21 + channels) {
av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
extradata_size);
@ -371,6 +371,15 @@ av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
}
layout = ff_vorbis_channel_layouts[channels - 1];
channel_reorder = channel_reorder_vorbis;
} else if (map_type == 2) {
int ambisonic_order = ff_sqrt(channels) - 1;
if (channels != (ambisonic_order + 1) * (ambisonic_order + 1)) {
av_log(avctx, AV_LOG_ERROR,
"Channel mapping 2 is only specified for channel counts"
" which can be written as (n + 1)^2 for nonnegative integer n\n");
return AVERROR_INVALIDDATA;
}
layout = 0;
} else
layout = 0;