📄 deblock_vert_usedc.c
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/**************************************************************************
* *
* 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 <darc@projectmayo.com>
*
**/
/***
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 in assembler */
INLINE int deblock_vert_useDC(uint8_t *v, int stride) {
const uint64_t mask = 0xfefefefefefefefe;
uint32_t mm_data1;
uint64_t *pmm1;
int eq_cnt, useDC;
#ifdef PP_SELF_CHECK
int useDC2, i, j;
#endif
#ifdef PP_SELF_CHECK
/* C-code version for testing */
eq_cnt = 0;
for (j=1; j<8; j++) {
for (i=0; i<8; i++) {
if (ABS(v[j*stride+i] - v[(j+1)*stride+i]) <= 1) eq_cnt++;
}
}
useDC2 = (eq_cnt > DEBLOCK_VERT_USEDC_THR);
#endif
/* starting pointer is at v[stride] == v1 in mpeg4 notation */
pmm1 = (uint64_t *)(&(v[stride]));
/* first load some constants into mm4, mm6, mm7 */
__asm {
push eax
mov eax, pmm1
movq mm6, mask /*mm6 = 0xfefefefefefefefe */
pxor mm7, mm7 /*mm7 = 0x0000000000000000 */
movq mm2, [eax] /* mm2 = *p_data */
pxor mm4, mm4 /*mm4 = 0x0000000000000000 */
add eax, stride /* p_data += stride */
movq mm3, mm2 /* mm3 = *p_data */
};
__asm {
movq mm2, [eax] /* mm2 = *p_data */
movq mm0, mm3 /* mm0 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm0 /* mm1 = mm0 */
psubusb mm0, mm2 /* mm0 -= mm2 */
add eax, stride /* p_data += stride */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm0, mm2 /* mm0 |= mm2 */
pand mm0, mm6 /* mm0 &= 0xfefefefefefefefe */
pcmpeqb mm0, mm4 /* is mm0 == 0 ? */
movq mm2, [eax] /* mm2 = *p_data */
psubb mm7, mm0 /* mm7 has running total of eqcnts */
movq mm5, mm3 /* mm5 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm5 /* mm1 = mm5 */
psubusb mm5, mm2 /* mm5 -= mm2 */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm5, mm2 /* mm5 |= mm2 */
add eax, stride /* p_data += stride */
pand mm5, mm6 /* mm5 &= 0xfefefefefefefefe */
pcmpeqb mm5, mm4 /* is mm0 == 0 ? */
psubb mm7, mm5 /* mm7 has running total of eqcnts */
movq mm2, [eax] /* mm2 = *p_data */
movq mm0, mm3 /* mm0 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm0 /* mm1 = mm0 */
psubusb mm0, mm2 /* mm0 -= mm2 */
add eax, stride /* p_data += stride */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm0, mm2 /* mm0 |= mm2 */
pand mm0, mm6 /* mm0 &= 0xfefefefefefefefe */
pcmpeqb mm0, mm4 /* is mm0 == 0 ? */
movq mm2, [eax] /* mm2 = *p_data */
psubb mm7, mm0 /* mm7 has running total of eqcnts */
movq mm5, mm3 /* mm5 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm5 /* mm1 = mm5 */
psubusb mm5, mm2 /* mm5 -= mm2 */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm5, mm2 /* mm5 |= mm2 */
add eax, stride /* p_data += stride */
pand mm5, mm6 /* mm5 &= 0xfefefefefefefefe */
pcmpeqb mm5, mm4 /* is mm0 == 0 ? */
psubb mm7, mm5 /* mm7 has running total of eqcnts */
movq mm2, [eax] /* mm2 = *p_data */
movq mm0, mm3 /* mm0 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm0 /* mm1 = mm0 */
psubusb mm0, mm2 /* mm0 -= mm2 */
add eax, stride /* p_data += stride */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm0, mm2 /* mm0 |= mm2 */
pand mm0, mm6 /* mm0 &= 0xfefefefefefefefe */
pcmpeqb mm0, mm4 /* is mm0 == 0 ? */
movq mm2, [eax] /* mm2 = *p_data */
psubb mm7, mm0 /* mm7 has running total of eqcnts */
movq mm5, mm3 /* mm5 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm5 /* mm1 = mm5 */
psubusb mm5, mm2 /* mm5 -= mm2 */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm5, mm2 /* mm5 |= mm2 */
add eax, stride /* p_data += stride */
pand mm5, mm6 /* mm5 &= 0xfefefefefefefefe */
pcmpeqb mm5, mm4 /* is mm0 == 0 ? */
psubb mm7, mm5 /* mm7 has running total of eqcnts */
movq mm2, [eax] /* mm2 = *p_data */
movq mm0, mm3 /* mm0 = mm3 */
movq mm3, mm2 /* mm3 = *p_data */
movq mm1, mm0 /* mm1 = mm0 */
psubusb mm0, mm2 /* mm0 -= mm2 */
add eax, stride /* p_data += stride */
psubusb mm2, mm1 /* mm2 -= mm1 */
por mm0, mm2 /* mm0 |= mm2 */
pand mm0, mm6 /* mm0 &= 0xfefefefefefefefe */
pcmpeqb mm0, mm4 /* is mm0 == 0 ? */
psubb mm7, mm0 /* mm7 has running total of eqcnts */
pop eax
};
/* now mm7 contains negative eq_cnt for all 8-columns */
/* copy this to mm_data1 */
/* sum all 8 bytes in mm7 */
__asm {
movq mm1, mm7 /* mm1 = mm7 0 1w2 3 4 5 6 7r */
psrlq mm7, 32 /* mm7 >>= 32 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 mm1, mm7 /* mm7 has running total of eqcnts */
movq mm7, mm1 /* 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 mm_data1, mm7 /* mm_data1 = mm7 */
};
eq_cnt = mm_data1 & 0xff;
useDC = (eq_cnt > DEBLOCK_VERT_USEDC_THR);
#ifdef PP_SELF_CHECK
if (useDC != useDC2) printf("ERROR: MMX version of useDC is incorrect\n");
#endif
return useDC;
}
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