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| author | michael <michael@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2003-10-27 21:12:29 +0000 |
|---|---|---|
| committer | michael <michael@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2003-10-27 21:12:29 +0000 |
| commit | eb14533f92b0af945e830e098aefa1fd6a5ab3ba (patch) | |
| tree | d3d4f04089040dc7809e3bb8c288421cd6789a87 /libmpcodecs | |
| parent | 0259d347c81461edeb5d028ba4628404d36a47b9 (diff) | |
| download | mpv-eb14533f92b0af945e830e098aefa1fd6a5ab3ba.tar.bz2 mpv-eb14533f92b0af945e830e098aefa1fd6a5ab3ba.tar.xz | |
different / faster / simpler "quantization"
filtered images look like with the old quantization (to me at least) if anyone notices a difference then tell me ASAP
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@11297 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libmpcodecs')
| -rw-r--r-- | libmpcodecs/vf_spp.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/libmpcodecs/vf_spp.c b/libmpcodecs/vf_spp.c index c62cb2bb20..40a9f9e23c 100644 --- a/libmpcodecs/vf_spp.c +++ b/libmpcodecs/vf_spp.c @@ -86,28 +86,20 @@ struct vf_priv_s { static inline void requantize(DCTELEM dst[64], DCTELEM src[64], int qp, uint8_t *permutation){ int i; const int qmul= qp<<1; - const int qadd= (qp-1)|1; - const int qinv= ((1<<(SHIFT-3)) + qmul/2)/ qmul; int bias= 0; //FIXME unsigned int threshold1, threshold2; - - threshold1= (1<<SHIFT) - bias - 1; + + threshold1= qmul*((1<<3) - bias) - 1; threshold2= (threshold1<<1); memset(dst, 0, 64*sizeof(DCTELEM)); - dst[0]= (src[0] + 4)>>3;; + dst[0]= (src[0] + 4)>>3; - for(i=1; i<64; i++){ - int level= qinv*src[i]; + for(i=1; i<64; i++){ + int level= src[i]; if(((unsigned)(level+threshold1))>threshold2){ const int j= permutation[i]; - if(level>0){ - level= (bias + level)>>SHIFT; - dst[j]= level*qmul + qadd; - }else{ - level= (bias - level)>>SHIFT; - dst[j]= -level*qmul - qadd; - } + dst[j]= (level + 4)>>3; } } } |