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avoid useless normalization and 10l fix 

Originally committed as revision 3229 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-06-17 16:34:46 +00:00
parent aaaf1635c0
commit 08f7073a6f
1 changed files with 12 additions and 5 deletions
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17
libavcodec/resample2.c
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@ -93,7 +93,7 @@ void av_build_filter(int16_t *filter, double factor, int tap_count, int phase_co
break;
case 2:
w = 2.0*x / (factor*tap_count*M_PI);
y *= bessel(16*sqrt(FFMAX(1-w*w, 0))) / bessel(16);
y *= bessel(16*sqrt(FFMAX(1-w*w, 0)));
break;
}
@ -139,10 +139,9 @@ void av_resample_close(AVResampleContext *c){
}
void av_resample_compensate(AVResampleContext *c, int sample_delta, int compensation_distance){
assert(!c->compensation_distance); //FIXME
// sample_delta += (c->ideal_dst_incr - c->dst_incr)*(int64_t)c->compensation_distance / c->ideal_dst_incr;
c->compensation_distance= compensation_distance;
c->dst_incr-= c->ideal_dst_incr * sample_delta / compensation_distance;
c->dst_incr = c->ideal_dst_incr - c->ideal_dst_incr * (int64_t)sample_delta / compensation_distance;
}
/**
@ -202,7 +201,7 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
}
if(update_ctx){
if(c->compensation_distance){
c->compensation_distance -= index;
c->compensation_distance -= dst_index;
if(!c->compensation_distance)
c->dst_incr= c->ideal_dst_incr;
}
@ -210,5 +209,13 @@ int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int
c->index=0;
}
*consumed= index >> PHASE_SHIFT;
#if 0
if(update_ctx && !c->compensation_distance){
#undef rand
av_resample_compensate(c, rand() % (8000*2) - 8000, 8000*2);
av_log(NULL, AV_LOG_DEBUG, "%d %d %d\n", c->dst_incr, c->ideal_dst_incr, c->compensation_distance);
}
#endif
return dst_index;
}