diff options
Diffstat (limited to 'libavresample/audio_mix.c')
| -rw-r--r-- | libavresample/audio_mix.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/libavresample/audio_mix.c b/libavresample/audio_mix.c index 487bddf746..b69bfbcf3e 100644 --- a/libavresample/audio_mix.c +++ b/libavresample/audio_mix.c @@ -572,11 +572,22 @@ static void reduce_matrix(AudioMix *am, const double *matrix, int stride) int skip = 1; for (o = 0; o < am->out_channels; o++) { + int i0; if ((o != i && matrix[o * stride + i] != 0.0) || (o == i && matrix[o * stride + i] != 1.0)) { skip = 0; break; } + /* if the input contributes fully to the output, also check that no + other inputs contribute to this output */ + if (o == i) { + for (i0 = 0; i0 < am->in_channels; i0++) { + if (i0 != i && matrix[o * stride + i0] != 0.0) { + skip = 0; + break; + } + } + } } if (skip) { am->input_skip[i] = 1; |