generic-library/ffmpeg
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Merge remote-tracking branch 'qatar/master'

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* qatar/master:
  lavr: fix mixing matrix reduction when normalization is disabled
  lavr: fix matrix reduction for upmixing in certain cases
  lavr: cosmetics: reindent

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-13 12:58:24 +01:00
commit 845fa2f5c9
1 changed files with 35 additions and 14 deletions
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21
libavresample/audio_mix.c
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@ -572,11 +572,22 @@ static void reduce_matrix(AudioMix *am, const double *matrix, int stride)
int skip = 1; int skip = 1;
for (o = 0; o < am->out_channels; o++) { for (o = 0; o < am->out_channels; o++) {
int i0;
if ((o != i && matrix[o * stride + i] != 0.0) || if ((o != i && matrix[o * stride + i] != 0.0) ||
(o == i && matrix[o * stride + i] != 1.0)) { (o == i && matrix[o * stride + i] != 1.0)) {
skip = 0; skip = 0;
break; 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) { if (skip) {
am->input_skip[i] = 1; am->input_skip[i] = 1;
@ -607,6 +618,7 @@ static void reduce_matrix(AudioMix *am, const double *matrix, int stride)
corresponding input channel */ corresponding input channel */
for (o = 0; o < FFMIN(am->in_channels, am->out_channels); o++) { for (o = 0; o < FFMIN(am->in_channels, am->out_channels); o++) {
int skip = 1; int skip = 1;
int o0;
for (i = 0; i < am->in_channels; i++) { for (i = 0; i < am->in_channels; i++) {
if ((o != i && matrix[o * stride + i] != 0.0) || if ((o != i && matrix[o * stride + i] != 0.0) ||
@ -615,6 +627,15 @@ static void reduce_matrix(AudioMix *am, const double *matrix, int stride)
break; break;
} }
} }
/* check if the corresponding input channel makes a contribution to
any other output channel */
i = o;
for (o0 = 0; o0 < am->out_channels; o0++) {
if (o0 != i && matrix[o0 * stride + i] != 0.0) {
skip = 0;
break;
}
}
if (skip) { if (skip) {
am->output_skip[o] = 1; am->output_skip[o] = 1;
am->out_matrix_channels--; am->out_matrix_channels--;