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Code Issues Releases Activity

msmpeg4: Fix ff_msmpeg4_pred_dc() so it works with lowres>0

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Fixes Ticket2532

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-24 03:44:30 +02:00
parent 46312fc2a9
commit 5dba888dd5
1 changed files with 8 additions and 7 deletions
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15
libavcodec/msmpeg4.c
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@ -175,13 +175,13 @@ int ff_msmpeg4_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block
return pred;
}
static int get_dc(uint8_t *src, int stride, int scale)
static int get_dc(uint8_t *src, int stride, int scale, int block_size)
{
int y;
int sum=0;
for(y=0; y<8; y++){
for(y=0; y<block_size; y++){
int x;
for(x=0; x<8; x++){
for(x=0; x<block_size; x++){
sum+=src[x + y*stride];
}
}
@ -276,17 +276,18 @@ int ff_msmpeg4_pred_dc(MpegEncContext *s, int n,
*dir_ptr = 0;
}
}else{
int bs = 8 >> s->avctx->lowres;
if(n<4){
wrap= s->linesize;
dest= s->current_picture.f.data[0] + (((n >> 1) + 2*s->mb_y) * 8* wrap ) + ((n & 1) + 2*s->mb_x) * 8;
dest= s->current_picture.f.data[0] + (((n >> 1) + 2*s->mb_y) * bs* wrap ) + ((n & 1) + 2*s->mb_x) * bs;
}else{
wrap= s->uvlinesize;
dest= s->current_picture.f.data[n - 3] + (s->mb_y * 8 * wrap) + s->mb_x * 8;
dest= s->current_picture.f.data[n - 3] + (s->mb_y * bs * wrap) + s->mb_x * bs;
}
if(s->mb_x==0) a= (1024 + (scale>>1))/scale;
else a= get_dc(dest-8, wrap, scale*8);
else a= get_dc(dest-bs, wrap, scale*8>>(2*s->avctx->lowres), bs);
if(s->mb_y==0) c= (1024 + (scale>>1))/scale;
else c= get_dc(dest-8*wrap, wrap, scale*8);
else c= get_dc(dest-bs*wrap, wrap, scale*8>>(2*s->avctx->lowres), bs);
if (s->h263_aic_dir==0) {
pred= a;