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Code Issues Releases Activity

10l trocadero: ZMBV encoder used zero score to detect whether block should be

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XORed with source one or not, which went wrong with new block comparing code.
So track this condition explicitly.

Originally committed as revision 20558 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2009-11-20 07:22:41 +00:00
parent cb893cf386
commit dd562761d9
1 changed files with 14 additions and 10 deletions
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24
libavcodec/zmbvenc.c
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@ -61,15 +61,19 @@ static int score_tab[256];
* XXX should be optimized and moved to DSPContext
* TODO handle out of edge ME
*/
static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, int bw, int bh)
static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, int bw, int bh, int *xored)
{
int sum = 0;
int i, j;
uint8_t histogram[256]={0};
*xored = 0;
for(j = 0; j < bh; j++){
for(i = 0; i < bw; i++)
histogram[src[i] ^ src2[i]]++;
for(i = 0; i < bw; i++){
int t = src[i] ^ src2[i];
histogram[t]++;
*xored |= t;
}
src += stride;
src2 += stride2;
}
@ -84,21 +88,21 @@ static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2
* TODO make better ME decisions
*/
static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev, int pstride,
int x, int y, int *mx, int *my)
int x, int y, int *mx, int *my, int *xored)
{
int dx, dy, tx, ty, tv, bv, bw, bh;
*mx = *my = 0;
bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
bv = block_cmp(src, sstride, prev, pstride, bw, bh);
bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored);
if(!bv) return 0;
for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
if(tx == x && ty == y) continue; // we already tested this block
dx = tx - x;
dy = ty - y;
tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh);
tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored);
if(tv < bv){
bv = tv;
*mx = dx;
@ -173,7 +177,7 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
work_size += avctx->width;
}
}else{
int x, y, bh2, bw2;
int x, y, bh2, bw2, xored;
uint8_t *tsrc, *tprev;
uint8_t *mv;
int mx, my, bv;
@ -192,11 +196,11 @@ static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void
tsrc = src + x;
tprev = prev + x;
bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my);
mv[0] = (mx << 1) | !!bv;
bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
mv[0] = (mx << 1) | !!xored;
mv[1] = my << 1;
tprev += mx + my * c->pstride;
if(bv){
if(xored){
for(j = 0; j < bh2; j++){
for(i = 0; i < bw2; i++)
c->work_buf[work_size++] = tsrc[i] ^ tprev[i];