AV_CH_LAYOUT_2POINT1  182 libavformat/mov_chan.c     { MOV_CH_LAYOUT_DVD_4,              AV_CH_LAYOUT_2POINT1  }, // L, R, LFE
AV_CH_LAYOUT_2POINT1   81 libavutil/channel_layout.c     { "2.1",         3,  AV_CH_LAYOUT_2POINT1 },