+ if ((in_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO) {
+ matrix[FRONT_LEFT ][FRONT_CENTER] += center_mix_level;
+ matrix[FRONT_RIGHT][FRONT_CENTER] += center_mix_level;
+ } else {
+ matrix[FRONT_LEFT ][FRONT_CENTER] += M_SQRT1_2;
+ matrix[FRONT_RIGHT][FRONT_CENTER] += M_SQRT1_2;
+ }