diff options
Diffstat (limited to 'libswresample')
| -rw-r--r-- | libswresample/rematrix.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/libswresample/rematrix.c b/libswresample/rematrix.c index 27c4e1b2dc..7728445407 100644 --- a/libswresample/rematrix.c +++ b/libswresample/rematrix.c @@ -184,8 +184,15 @@ static int auto_matrix(SwrContext *s) if(unaccounted & AV_CH_SIDE_LEFT){ if(s->out_ch_layout & AV_CH_BACK_LEFT){ - matrix[ BACK_LEFT][ SIDE_LEFT]+= 1.0; - matrix[BACK_RIGHT][SIDE_RIGHT]+= 1.0; + /* if back channels do not exist in the input, just copy side + channels to back channels, otherwise mix side into back */ + if (s->in_ch_layout & AV_CH_BACK_LEFT) { + matrix[BACK_LEFT ][SIDE_LEFT ] += M_SQRT1_2; + matrix[BACK_RIGHT][SIDE_RIGHT] += M_SQRT1_2; + } else { + matrix[BACK_LEFT ][SIDE_LEFT ] += 1.0; + matrix[BACK_RIGHT][SIDE_RIGHT] += 1.0; + } }else if(s->out_ch_layout & AV_CH_BACK_CENTER){ matrix[BACK_CENTER][ SIDE_LEFT]+= M_SQRT1_2; matrix[BACK_CENTER][SIDE_RIGHT]+= M_SQRT1_2; |