eessppeelllloo/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2026-01-06 06:05:32 +01:00
Code Issues Packages Projects Releases Wiki Activity

exploit mdct symmetry

Browse Source 
2% faster vorbis on conroe, k8. 7% on celeron.

Originally committed as revision 14207 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt
2008-07-13 15:03:58 +00:00
parent eb2cd99c73
commit b9fa32082c
8 changed files with 241 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
libavcodec/dsputil.c
View File

@@ -3931,9 +3931,18 @@ void ff_vector_fmul_add_add_c(float *dst, const float *src0, const float *src1,
}
void ff_vector_fmul_window_c(float *dst, const float *src0, const float *src1, const float *win, float add_bias, int len){
int i;
for(i=0; i<len; i++)
dst[i] = src0[i]*win[len-i-1] + src1[i]*win[i] + add_bias;
int i,j;
dst += len;
win += len;
src0+= len;
for(i=-len, j=len-1; i<0; i++, j--) {
float s0 = src0[i];
float s1 = src1[j];
float wi = win[i];
float wj = win[j];
dst[i] = s0*wj - s1*wi + add_bias;
dst[j] = s0*wi + s1*wj + add_bias;
}
}
static av_always_inline int float_to_int16_one(const float *src){