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remove dithering of filter coefficients, improves precision by 1-2 bits and 

improves subjective sound quality on artificial sample (udial.wav resampling
to 32khz)

Originally committed as revision 8467 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-03-21 22:02:52 +00:00
parent 8076609a40
commit 66a148a19a
1 changed files with 1 additions and 3 deletions
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4
libavcodec/resample2.c
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@ -93,7 +93,6 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun
for(ph=0;ph<phase_count;ph++) {
double norm = 0;
double e= 0;
for(i=0;i<tap_count;i++) {
x = M_PI * ((double)(i - center) - (double)ph / phase_count) * factor;
if (x == 0) y = 1.0;
@ -121,9 +120,8 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun
/* normalize so that an uniform color remains the same */
for(i=0;i<tap_count;i++) {
v = av_clip(lrintf(tab[i] * scale / norm + e), FELEM_MIN, FELEM_MAX);
v = av_clip(lrintf(tab[i] * scale / norm), FELEM_MIN, FELEM_MAX);
filter[ph * tap_count + i] = v;
e += tab[i] * scale / norm - v;
}
}
}