CH_LAYOUT_7POINT1   98 libavcodec/audioconvert.c     case 8: return CH_LAYOUT_7POINT1;
CH_LAYOUT_7POINT1  115 libavcodec/audioconvert.c     { "7.1",         8,  CH_LAYOUT_7POINT1 },
CH_LAYOUT_7POINT1  117 libavcodec/audioconvert.c     { "7.1+downmix", 10, CH_LAYOUT_7POINT1|CH_LAYOUT_STEREO_DOWNMIX, },