diff options
Diffstat (limited to 'libavcodec/h264idct.c')
-rw-r--r-- | libavcodec/h264idct.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/libavcodec/h264idct.c b/libavcodec/h264idct.c index f5b05ac24f..53e70a22df 100644 --- a/libavcodec/h264idct.c +++ b/libavcodec/h264idct.c @@ -250,4 +250,26 @@ void ff_h264_luma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qmul){ output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8)); output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8)); } +#undef stride +} + +void ff_chroma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qmul){ + const int stride= 16*2; + const int xStride= 16; + int a,b,c,d,e; + + a= input[0]; + b= input[1]; + c= input[2]; + d= input[3]; + + e= a-b; + a= a+b; + b= c-d; + c= c+d; + + output[stride*0 + xStride*0]= ((a+c)*qmul) >> 7; + output[stride*0 + xStride*1]= ((e+b)*qmul) >> 7; + output[stride*1 + xStride*0]= ((a-c)*qmul) >> 7; + output[stride*1 + xStride*1]= ((e-b)*qmul) >> 7; } |