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make kaiser windows with other beta than 16 available

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Originally committed as revision 8472 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-03-21 23:44:49 +00:00
parent f88e7c833b
commit 20cf58c32b
1 changed files with 3 additions and 3 deletions
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6
libavcodec/resample2.c
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@ -80,7 +80,7 @@ static double bessel(double x){
* builds a polyphase filterbank.
* @param factor resampling factor
* @param scale wanted sum of coefficients for each filter
* @param type 0->cubic, 1->blackman nuttall windowed sinc, 2->kaiser windowed sinc beta=16
* @param type 0->cubic, 1->blackman nuttall windowed sinc, 2..16->kaiser windowed sinc beta=2..16
*/
void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_count, int scale, int type){
int ph, i, v;
@ -108,9 +108,9 @@ void av_build_filter(FELEM *filter, double factor, int tap_count, int phase_coun
w = 2.0*x / (factor*tap_count) + M_PI;
y *= 0.3635819 - 0.4891775 * cos(w) + 0.1365995 * cos(2*w) - 0.0106411 * cos(3*w);
break;
case 2:
default:
w = 2.0*x / (factor*tap_count*M_PI);
y *= bessel(16*sqrt(FFMAX(1-w*w, 0)));
y *= bessel(type*sqrt(FFMAX(1-w*w, 0)));
break;
}