AC3_CHMODE_3F2R   393 libavcodec/ac3dec.c     if (s->channel_mode == AC3_CHMODE_2F2R || s->channel_mode == AC3_CHMODE_3F2R) {
AC3_CHMODE_3F2R   739 libavcodec/ac3dec.c     case AC3_CHMODE_3F2R:
AC3_CHMODE_3F2R  2092 libavcodec/ac3enc.c     case AV_CH_LAYOUT_5POINT0_BACK:   s->channel_mode = AC3_CHMODE_3F2R;   break;