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Code Issues Releases Activity

Fix visual artifacts in 4XM decoding on big-endian system

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Originally committed as revision 25734 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2010-11-12 19:55:26 +00:00
parent 38b3bda18f
commit c4e8733ac1
1 changed files with 24 additions and 7 deletions
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31
libavcodec/4xm.c
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@ -260,6 +260,23 @@ static void init_mv(FourXContext *f){
}
}
#if HAVE_BIGENDIAN
#define LE_CENTRIC_MUL(dst, src, scale, dc) \
{ \
unsigned tmpval = AV_RN32(src); \
tmpval = (tmpval << 16) | (tmpval >> 16); \
tmpval = tmpval * (scale) + (dc); \
tmpval = (tmpval << 16) | (tmpval >> 16); \
AV_WN32A(dst, tmpval); \
}
#else
#define LE_CENTRIC_MUL(dst, src, scale, dc) \
{ \
unsigned tmpval = AV_RN32(src) * (scale) + (dc); \
AV_WN32A(dst, tmpval); \
}
#endif
static inline void mcdc(uint16_t *dst, uint16_t *src, int log2w, int h, int stride, int scale, int dc){
int i;
dc*= 0x10001;
@ -274,25 +291,25 @@ static inline void mcdc(uint16_t *dst, uint16_t *src, int log2w, int h, int stri
break;
case 1:
for(i=0; i<h; i++){
((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
LE_CENTRIC_MUL(dst, src, scale, dc);
if(scale) src += stride;
dst += stride;
}
break;
case 2:
for(i=0; i<h; i++){
((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc;
LE_CENTRIC_MUL(dst, src, scale, dc);
LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
if(scale) src += stride;
dst += stride;
}
break;
case 3:
for(i=0; i<h; i++){
((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc;
((uint32_t*)dst)[2] = scale*((uint32_t*)src)[2] + dc;
((uint32_t*)dst)[3] = scale*((uint32_t*)src)[3] + dc;
LE_CENTRIC_MUL(dst, src, scale, dc);
LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc);
LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc);
if(scale) src += stride;
dst += stride;
}