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special case for filter_length==1 

Originally committed as revision 3787 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-12-31 12:58:46 +00:00
parent 579448a083
commit 6cb5dcb392
1 changed files with 18 additions and 1 deletions
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19
libavcodec/resample2.c
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@ -141,7 +141,7 @@ AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_size,
c->phase_mask= phase_count-1;
c->linear= linear;
c->filter_length= ceil(filter_size/factor);
c->filter_length= FFMAX(ceil(filter_size/factor), 1);
c->filter_bank= av_mallocz(c->filter_length*(phase_count+1)*sizeof(FELEM));
av_build_filter(c->filter_bank, factor, c->filter_length, phase_count, 1<<FILTER_SHIFT, 1);
memcpy(&c->filter_bank[c->filter_length*phase_count+1], c->filter_bank, (c->filter_length-1)*sizeof(FELEM));
@ -194,6 +194,22 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
int dst_incr= c->dst_incr / c->src_incr;
int compensation_distance= c->compensation_distance;
if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
assert(index >= 0);
for(dst_index=0; dst_index < dst_size; dst_index++){
if(index < src_size)
dst[dst_index] = src[index];
else
break;
frac += dst_incr_frac;
index += dst_incr;
if(frac >= c->src_incr){
frac -= c->src_incr;
index++;
}
}
}else{
for(dst_index=0; dst_index < dst_size; dst_index++){
FELEM *filter= c->filter_bank + c->filter_length*(index & c->phase_mask);
int sample_index= index >> c->phase_shift;
@ -234,6 +250,7 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
dst_incr= c->ideal_dst_incr / c->src_incr;
}
}
}
*consumed= FFMAX(index, 0) >> c->phase_shift;
if(index>=0) index &= c->phase_mask;