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faster and slightly less accurate nearest neighbor resampler
Originally committed as revision 3789 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -193,22 +193,20 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
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int dst_incr_frac= c->dst_incr % c->src_incr;
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int dst_incr= c->dst_incr / c->src_incr;
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int compensation_distance= c->compensation_distance;
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if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
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assert(index >= 0);
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for(dst_index=0; dst_index < dst_size; dst_index++){
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if(index < src_size)
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dst[dst_index] = src[index];
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else
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break;
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frac += dst_incr_frac;
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index += dst_incr;
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if(frac >= c->src_incr){
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frac -= c->src_incr;
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index++;
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}
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if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
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int64_t index2= ((int64_t)index)<<32;
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int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;
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dst_size= FFMIN(dst_size, (src_size-1-index) * (int64_t)c->src_incr / c->dst_incr);
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for(dst_index=0; dst_index < dst_size; dst_index++){
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dst[dst_index] = src[index2>>32];
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index2 += incr;
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}
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frac += dst_index * dst_incr_frac;
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index += dst_index * dst_incr;
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index += frac / c->src_incr;
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frac %= c->src_incr;
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}else{
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for(dst_index=0; dst_index < dst_size; dst_index++){
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FELEM *filter= c->filter_bank + c->filter_length*(index & c->phase_mask);
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