CH_LAYOUT_5POINT1   97 libavcodec/audioconvert.c     case 6: return CH_LAYOUT_5POINT1;
CH_LAYOUT_5POINT1  113 libavcodec/audioconvert.c     { "5.1",         6,  CH_LAYOUT_5POINT1 },
CH_LAYOUT_5POINT1  114 libavcodec/audioconvert.c     { "5.1+downmix", 8,  CH_LAYOUT_5POINT1|CH_LAYOUT_STEREO_DOWNMIX, },
CH_LAYOUT_5POINT1  382 libavcodec/avcodec.h #define CH_LAYOUT_7POINT1           (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)