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Weak deblock filter function for future RV40 loop filter 

Originally committed as revision 15827 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2008-11-15 14:15:24 +00:00
parent 536cd1db71
commit 70f42303e7
1 changed files with 38 additions and 0 deletions
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38
libavcodec/rv40.c
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@ -247,6 +247,44 @@ static int rv40_decode_mb_info(RV34DecContext *r)
return 0;
}
#define CLIP_SYMM(a, b) av_clip(a, -(b), b)
/**
* weaker deblocking very similar to the one described in 4.4.2 of JVT-A003r1
*/
static inline void rv40_weak_loop_filter(uint8_t *src, const int step,
const int filter_p1, const int filter_q1,
const int alpha, const int beta,
const int lim_p0q0,
const int lim_q1, const int lim_p1,
const int diff_p1p0, const int diff_q1q0,
const int diff_p1p2, const int diff_q1q2)
{
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int t, u, diff;
t = src[0*step] - src[-1*step];
if(!t)
return;
u = (alpha * FFABS(t)) >> 7;
if(u > 3 - (filter_p1 && filter_q1))
return;
t <<= 2;
if(filter_p1 && filter_q1)
t += src[-2*step] - src[1*step];
diff = CLIP_SYMM((t + 4) >> 3, lim_p0q0);
src[-1*step] = cm[src[-1*step] + diff];
src[ 0*step] = cm[src[ 0*step] - diff];
if(FFABS(diff_p1p2) <= beta && filter_p1){
t = (diff_p1p0 + diff_p1p2 - diff) >> 1;
src[-2*step] = cm[src[-2*step] - CLIP_SYMM(t, lim_p1)];
}
if(FFABS(diff_q1q2) <= beta && filter_q1){
t = (diff_q1q0 + diff_q1q2 + diff) >> 1;
src[ 1*step] = cm[src[ 1*step] - CLIP_SYMM(t, lim_q1)];
}
}
/**
* Initialize decoder.
*/