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swr: special case for empty channels in rematrix.

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Speed += 10% overall for pan=stereo:FL=FL+FR from wav to null.
This commit is contained in:
Nicolas George 2012-02-20 23:55:28 +01:00
parent 1ea3b657d6
commit a8cdb7b95a
1 changed files with 3 additions and 0 deletions
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libswresample/rematrix.c
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@ -280,6 +280,9 @@ int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mus
for(out_i=0; out_i<out->ch_count; out_i++){ for(out_i=0; out_i<out->ch_count; out_i++){
switch(s->matrix_ch[out_i][0]){ switch(s->matrix_ch[out_i][0]){
case 0:
memset(out->ch[out_i], 0, len * (s->int_sample_fmt == AV_SAMPLE_FMT_FLT ? sizeof(float) : sizeof(int16_t)));
break;
case 1: case 1:
in_i= s->matrix_ch[out_i][1]; in_i= s->matrix_ch[out_i][1];
if(mustcopy || s->matrix[out_i][in_i]!=1.0){ if(mustcopy || s->matrix[out_i][in_i]!=1.0){