eessppeelllloo/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2026-01-06 14:15:29 +01:00
Code Issues Packages Projects Releases Wiki Activity

vp3: DC-only IDCT

Browse Source 
2-4% faster overall decode

Originally committed as revision 22896 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad
2010-04-17 02:04:30 +00:00
parent f32f7d8b24
commit eb6a6cd788
9 changed files with 118 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
libavcodec/vp3dsp.c
View File

@@ -223,6 +223,25 @@ void ff_vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*
idct(dest, line_size, block, 2);
}
void ff_vp3_idct_dc_add_c(uint8_t *dest/*align 8*/, int line_size, const DCTELEM *block/*align 16*/){
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int i, dc = block[0];
dc = (46341*dc)>>16;
dc = (46341*dc + (8<<16))>>20;
for(i = 0; i < 8; i++){
dest[0] = cm[dest[0]+dc];
dest[1] = cm[dest[1]+dc];
dest[2] = cm[dest[2]+dc];
dest[3] = cm[dest[3]+dc];
dest[4] = cm[dest[4]+dc];
dest[5] = cm[dest[5]+dc];
dest[6] = cm[dest[6]+dc];
dest[7] = cm[dest[7]+dc];
dest += line_size;
}
}
void ff_vp3_v_loop_filter_c(uint8_t *first_pixel, int stride, int *bounding_values)
{
unsigned char *end;