www.pudn.com > MPEG4Codec.zip > deblock_horiz_useDC.c
/**************************************************************************
* *
* This code has been developed by John Funnell. This software is an *
* implementation of a part of one or more MPEG-4 Video tools as *
* specified in ISO/IEC 14496-2 standard. Those intending to use this *
* software module in hardware or software products are advised that its *
* use may infringe existing patents or copyrights, and any such use *
* would be at such party's own risk. The original developer of this *
* software module and his/her company, and subsequent editors and their *
* companies (including Project Mayo), will have no liability for use of *
* this software or modifications or derivatives thereof. *
* *
* Project Mayo gives users of the Codec a license to this software *
* module or modifications thereof for use in hardware or software *
* products claiming conformance to the MPEG-4 Video Standard as *
* described in the Open DivX license. *
* *
* The complete Open DivX license can be found at *
* http://www.projectmayo.com/opendivx/license.php *
* *
**************************************************************************/
/**
* Copyright (C) 2001 - Project Mayo
*
* John Funnell
*
* DivX Advanced Research Center
*
**/
/***
References:
* ISO/IEC 14496-2
* MoMuSys-FDIS-V1.0-990812
* Intel Architecture Software Developer's Manual
Volume 2: Instruction Set Reference
***/
#include "postprocess_mmx.h"
/* John Funnell, December 2000 */
/* decide DC mode or default mode for the horizontal filter */
INLINE int deblock_horiz_useDC(uint8_t *v, int stride) {
const uint64_t mm64_mask = 0x00fefefefefefefe;
uint32_t mm32_result;
uint64_t *pmm1;
int eq_cnt, useDC;
#ifdef PP_SELF_CHECK
int eq_cnt2, j, k;
#endif
pmm1 = (uint64_t *)(&(v[1])); /* this is a 32-bit aligned pointer, not 64-aligned */
__asm {
push eax
mov eax, pmm1
/* first load some constants into mm4, mm5, mm6, mm7 */
movq mm6, mm64_mask /*mm6 = 0x00fefefefefefefe */
pxor mm4, mm4 /*mm4 = 0x0000000000000000 */
movq mm1, qword ptr [eax] /* mm1 = *pmm 0 1 2 3 4 5 6 7 */
add eax, stride /* eax += stride/8 0 1 2 3 4 5 6 7 */
movq mm5, mm1 /* mm5 = mm1 0 1 2 3 4 5 6 7 */
psrlq mm1, 8 /* mm1 >>= 8 0 1 2 3 4 5 6 7 */
movq mm2, mm5 /* mm2 = mm5 0 1 2 3 4 5 6 7 */
psubusb mm5, mm1 /* mm5 -= mm1 0 1 2 3 4 5 6 7 */
movq mm3, qword ptr [eax] /* mm3 = *pmm 0 1 2 3 4 5 6 7 */
psubusb mm1, mm2 /* mm1 -= mm2 0 1 2 3 4 5 6 7 */
add eax, stride /* eax += stride/8 0 1 2 3 4 5 6 7 */
por mm5, mm1 /* mm5 |= mm1 0 1 2 3 4 5 6 7 */
movq mm0, mm3 /* mm0 = mm3 0 1 2 3 4 5 6 7 */
pand mm5, mm6 /* mm5 &= 0xfefefefefefefefe */
pxor mm7, mm7 /*mm7 = 0x0000000000000000 */
pcmpeqb mm5, mm4 /* are the bytes of mm5 == 0 ? */
movq mm1, qword ptr [eax] /* mm3 = *pmm 0 1 2 3 4 5 6 7 */
psubb mm7, mm5 /* mm7 has running total of eqcnts */
psrlq mm3, 8 /* mm3 >>= 8 0 1 2 3 4 5 6 7 */
movq mm5, mm0 /* mm5 = mm0 0 1 2 3 4 5 6 7 */
psubusb mm0, mm3 /* mm0 -= mm3 0 1 2 3 4 5 6 7 */
add eax, stride /* eax += stride/8 0 1 2 3 4 5 6 7 */
psubusb mm3, mm5 /* mm3 -= mm5 0 1 2 3 4 5 6 7 */
movq mm5, qword ptr [eax] /* mm5 = *pmm 0 1 2 3 4 5 6 7 */
por mm0, mm3 /* mm0 |= mm3 0 1 2 3 4 5 6 7 */
movq mm3, mm1 /* mm3 = mm1 0 1 2 3 4 5 6 7 */
pand mm0, mm6 /* mm0 &= 0xfefefefefefefefe */
psrlq mm1, 8 /* mm1 >>= 8 0 1 2 3 4 5 6 7 */
pcmpeqb mm0, mm4 /* are the bytes of mm0 == 0 ? */
movq mm2, mm3 /* mm2 = mm3 0 1 2 3 4 5 6 7 */
psubb mm7, mm0 /* mm7 has running total of eqcnts */
psubusb mm3, mm1 /* mm3 -= mm1 0 1 2 3 4 5 6 7 */
psubusb mm1, mm2 /* mm1 -= mm2 0 1 2 3 4 5 6 7 */
por mm3, mm1 /* mm3 |= mm1 0 1 2 3 4 5 6 7 */
movq mm1, mm5 /* mm1 = mm5 0 1 2 3 4 5 6 7 */
pand mm3, mm6 /* mm3 &= 0xfefefefefefefefe */
psrlq mm5, 8 /* mm5 >>= 8 0 1 2 3 4 5 6 7 */
pcmpeqb mm3, mm4 /* are the bytes of mm3 == 0 ? */
movq mm0, mm1 /* mm0 = mm1 0 1 2 3 4 5 6 7 */
psubb mm7, mm3 /* mm7 has running total of eqcnts */
psubusb mm1, mm5 /* mm1 -= mm5 0 1 2 3 4 5 6 7 */
psubusb mm5, mm0 /* mm5 -= mm0 0 1 2 3 4 5 6 7 */
por mm1, mm5 /* mm1 |= mm5 0 1 2 3 4 5 6 7 */
pand mm1, mm6 /* mm1 &= 0xfefefefefefefefe */
pcmpeqb mm1, mm4 /* are the bytes of mm1 == 0 ? */
psubb mm7, mm1 /* mm7 has running total of eqcnts */
movq mm1, mm7 /* mm1 = mm7 0 1w2 3 4 5 6 7r */
psllq mm7, 8 /* mm7 >>= 24 0 1 2 3 4 5 6 7m */
psrlq mm1, 24 /* mm7 >>= 24 0 1 2 3 4 5 6 7m */
paddb mm7, mm1 /* mm7 has running total of eqcnts */
movq mm1, mm7 /* mm1 = mm7 0 1w2 3 4 5 6 7r */
psrlq mm7, 16 /* mm7 >>= 16 0 1 2 3 4 5 6 7m */
paddb mm7, mm1 /* mm7 has running total of eqcnts */
movq mm1, mm7 /* mm1 = mm7 0 1w2 3 4 5 6 7r */
psrlq mm7, 8 /* mm7 >>= 8 0 1 2 3 4 5 6 7m */
paddb mm7, mm1 /* mm7 has running total of eqcnts */
movd mm32_result, mm7
pop eax
};
eq_cnt = mm32_result & 0xff;
#ifdef PP_SELF_CHECK
eq_cnt2 = 0;
for (k=0; k<4; k++) {
for (j=1; j<=7; j++) {
if (ABS(v[j+k*stride]-v[1+j+k*stride]) <= 1) eq_cnt2++;
}
}
if (eq_cnt2 != eq_cnt) printf("ERROR: MMX version of useDC is incorrect\n");
#endif
useDC = eq_cnt >= DEBLOCK_HORIZ_USEDC_THR;
return useDC;
}