mpegvideo_mmx.c

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

/*
 * The simplest mpeg encoder (well, it was the simplest!)
 * Copyright (c) 2000,2001 Fabrice Bellard.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Optimized for ia32 cpus by Nick Kurshev <[e-mail]>
 * h263, mpeg1, mpeg2 dequantizer & draw_edges by Michael Niedermayer <[e-mail]>
 */

#include "../dsputil.h"
#include "../mpegvideo.h"
#include "../avcodec.h"

extern uint8_t zigzag_direct_noperm[64];
extern uint16_t inv_zigzag_direct16[64];

static const unsigned long long int mm_wabs __attribute__ ((aligned(8))) = 0xffffffffffffffffULL;
static const unsigned long long int mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001ULL;


static void dct_unquantize_h263_mmx(MpegEncContext *s,
                                  DCTELEM *block, int n, int qscale)
{
    int level, qmul, qadd, nCoeffs;

    qmul = qscale << 1;
    qadd = (qscale - 1) | 1;

    assert(s->block_last_index[n]>=0);
        
    if (s->mb_intra) {
        if (!s->h263_aic) {
            if (n < 4)
                level = block[0] * s->y_dc_scale;
            else
                level = block[0] * s->c_dc_scale;
        }else{
            qadd = 0;
            level= block[0];
        }
        nCoeffs=63;
    } else {
	nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
        level = 0;/* keep gcc quiet */
    }
//printf("%d %d  ", qmul, qadd);
asm volatile(
		"movd %1, %%mm6			\n\t" //qmul
		"packssdw %%mm6, %%mm6		\n\t"
		"packssdw %%mm6, %%mm6		\n\t"
		"movd %2, %%mm5			\n\t" //qadd
		"pxor %%mm7, %%mm7		\n\t"
		"packssdw %%mm5, %%mm5		\n\t"
		"packssdw %%mm5, %%mm5		\n\t"
		"psubw %%mm5, %%mm7		\n\t"
		"pxor %%mm4, %%mm4		\n\t"
		".balign 16\n\t"
		"1:				\n\t"
		"movq (%0, %3), %%mm0		\n\t"
		"movq 8(%0, %3), %%mm1		\n\t"

		"pmullw %%mm6, %%mm0		\n\t"
		"pmullw %%mm6, %%mm1		\n\t"

		"movq (%0, %3), %%mm2		\n\t"
		"movq 8(%0, %3), %%mm3		\n\t"

		"pcmpgtw %%mm4, %%mm2		\n\t" // block[i] < 0 ? -1 : 0
		"pcmpgtw %%mm4, %%mm3		\n\t" // block[i] < 0 ? -1 : 0

		"pxor %%mm2, %%mm0		\n\t"
		"pxor %%mm3, %%mm1		\n\t"

		"paddw %%mm7, %%mm0		\n\t"
		"paddw %%mm7, %%mm1		\n\t"

		"pxor %%mm0, %%mm2		\n\t"
		"pxor %%mm1, %%mm3		\n\t"

		"pcmpeqw %%mm7, %%mm0		\n\t" // block[i] == 0 ? -1 : 0
		"pcmpeqw %%mm7, %%mm1		\n\t" // block[i] == 0 ? -1 : 0

		"pandn %%mm2, %%mm0		\n\t"
		"pandn %%mm3, %%mm1		\n\t"

		"movq %%mm0, (%0, %3)		\n\t"
		"movq %%mm1, 8(%0, %3)		\n\t"

		"addl $16, %3			\n\t"
		"jng 1b				\n\t"
		::"r" (block+nCoeffs), "g"(qmul), "g" (qadd), "r" (2*(-nCoeffs))
		: "memory"
	);
        if(s->mb_intra)
            block[0]= level;
}


/*
  NK:
  Note: looking at PARANOID:
  "enable all paranoid tests for rounding, overflows, etc..."

#ifdef PARANOID
                if (level < -2048 || level > 2047)
                    fprintf(stderr, "unquant error %d %d\n", i, level);
#endif
  We can suppose that result of two multiplications can't be greate of 0xFFFF
  i.e. is 16-bit, so we use here only PMULLW instruction and can avoid
  a complex multiplication.
=====================================================
 Full formula for multiplication of 2 integer numbers
 which are represent as high:low words:
 input: value1 = high1:low1
        value2 = high2:low2
 output: value3 = value1*value2
 value3=high3:low3 (on overflow: modulus 2^32 wrap-around)
 this mean that for 0x123456 * 0x123456 correct result is 0x766cb0ce4
 but this algorithm will compute only 0x66cb0ce4
 this limited by 16-bit size of operands
 ---------------------------------
 tlow1 = high1*low2
 tlow2 = high2*low1
 tlow1 = tlow1 + tlow2
 high3:low3 = low1*low2
 high3 += tlow1
*/
static void dct_unquantize_mpeg1_mmx(MpegEncContext *s,
                                     DCTELEM *block, int n, int qscale)
{
    int nCoeffs;
    const uint16_t *quant_matrix;

    assert(s->block_last_index[n]>=0);

    nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ]+1;

    if (s->mb_intra) {
        int block0;
        if (n < 4) 
            block0 = block[0] * s->y_dc_scale;
        else
            block0 = block[0] * s->c_dc_scale;
        /* XXX: only mpeg1 */
        quant_matrix = s->intra_matrix;
asm volatile(
		"pcmpeqw %%mm7, %%mm7		\n\t"
		"psrlw $15, %%mm7		\n\t"
		"movd %2, %%mm6			\n\t"
		"packssdw %%mm6, %%mm6		\n\t"
		"packssdw %%mm6, %%mm6		\n\t"
                "movl %3, %%eax			\n\t"
		".balign 16\n\t"
		"1:				\n\t"
		"movq (%0, %%eax), %%mm0	\n\t"
		"movq 8(%0, %%eax), %%mm1	\n\t"
		"movq (%1, %%eax), %%mm4	\n\t"
		"movq 8(%1, %%eax), %%mm5	\n\t"
		"pmullw %%mm6, %%mm4		\n\t" // q=qscale*quant_matrix[i]
		"pmullw %%mm6, %%mm5		\n\t" // q=qscale*quant_matrix[i]
		"pxor %%mm2, %%mm2		\n\t"
		"pxor %%mm3, %%mm3		\n\t"
		"pcmpgtw %%mm0, %%mm2		\n\t" // block[i] < 0 ? -1 : 0
		"pcmpgtw %%mm1, %%mm3		\n\t" // block[i] < 0 ? -1 : 0
		"pxor %%mm2, %%mm0		\n\t"
		"pxor %%mm3, %%mm1		\n\t"
		"psubw %%mm2, %%mm0		\n\t" // abs(block[i])
		"psubw %%mm3, %%mm1		\n\t" // abs(block[i])
		"pmullw %%mm4, %%mm0		\n\t" // abs(block[i])*q
		"pmullw %%mm5, %%mm1		\n\t" // abs(block[i])*q
		"pxor %%mm4, %%mm4		\n\t"
		"pxor %%mm5, %%mm5		\n\t" // FIXME slow
		"pcmpeqw (%0, %%eax), %%mm4	\n\t" // block[i] == 0 ? -1 : 0
		"pcmpeqw 8(%0, %%eax), %%mm5	\n\t" // block[i] == 0 ? -1 : 0
		"psraw $3, %%mm0		\n\t"
		"psraw $3, %%mm1		\n\t"
		"psubw %%mm7, %%mm0		\n\t"
		"psubw %%mm7, %%mm1		\n\t"
		"por %%mm7, %%mm0		\n\t"
		"por %%mm7, %%mm1		\n\t"
		"pxor %%mm2, %%mm0		\n\t"
		"pxor %%mm3, %%mm1		\n\t"
		"psubw %%mm2, %%mm0		\n\t"
		"psubw %%mm3, %%mm1		\n\t"
		"pandn %%mm0, %%mm4		\n\t"
		"pandn %%mm1, %%mm5		\n\t"
		"movq %%mm4, (%0, %%eax)	\n\t"
		"movq %%mm5, 8(%0, %%eax)	\n\t"

		"addl $16, %%eax		\n\t"
		"js 1b				\n\t"
		::"r" (block+nCoeffs), "r"(quant_matrix+nCoeffs), "g" (qscale), "g" (-2*nCoeffs)
		: "%eax", "memory"
	);    
        block[0]= block0;

        } else {
        quant_matrix = s->inter_matrix;
asm volatile(
		"pcmpeqw %%mm7, %%mm7		\n\t"
		"psrlw $15, %%mm7		\n\t"
		"movd %2, %%mm6			\n\t"
		"packssdw %%mm6, %%mm6		\n\t"
		"packssdw %%mm6, %%mm6		\n\t"
                "movl %3, %%eax			\n\t"
		".balign 16\n\t"
		"1:				\n\t"
		"movq (%0, %%eax), %%mm0	\n\t"
		"movq 8(%0, %%eax), %%mm1	\n\t"
		"movq (%1, %%eax), %%mm4	\n\t"
		"movq 8(%1, %%eax), %%mm5	\n\t"
		"pmullw %%mm6, %%mm4		\n\t" // q=qscale*quant_matrix[i]
		"pmullw %%mm6, %%mm5		\n\t" // q=qscale*quant_matrix[i]
		"pxor %%mm2, %%mm2		\n\t"
		"pxor %%mm3, %%mm3		\n\t"
		"pcmpgtw %%mm0, %%mm2		\n\t" // block[i] < 0 ? -1 : 0
		"pcmpgtw %%mm1, %%mm3		\n\t" // block[i] < 0 ? -1 : 0
		"pxor %%mm2, %%mm0		\n\t"
		"pxor %%mm3, %%mm1		\n\t"
		"psubw %%mm2, %%mm0		\n\t" // abs(block[i])
		"psubw %%mm3, %%mm1		\n\t" // abs(block[i])
		"paddw %%mm0, %%mm0		\n\t" // abs(block[i])*2
		"paddw %%mm1, %%mm1		\n\t" // abs(block[i])*2
		"paddw %%mm7, %%mm0		\n\t" // abs(block[i])*2 + 1
		"paddw %%mm7, %%mm1		\n\t" // abs(block[i])*2 + 1
		"pmullw %%mm4, %%mm0		\n\t" // (abs(block[i])*2 + 1)*q
		"pmullw %%mm5, %%mm1		\n\t" // (abs(block[i])*2 + 1)*q
		"pxor %%mm4, %%mm4		\n\t"
		"pxor %%mm5, %%mm5		\n\t" // FIXME slow
		"pcmpeqw (%0, %%eax), %%mm4	\n\t" // block[i] == 0 ? -1 : 0
		"pcmpeqw 8(%0, %%eax), %%mm5	\n\t" // block[i] == 0 ? -1 : 0
		"psraw $4, %%mm0		\n\t"
		"psraw $4, %%mm1		\n\t"
		"psubw %%mm7, %%mm0		\n\t"
		"psubw %%mm7, %%mm1		\n\t"
		"por %%mm7, %%mm0		\n\t"
		"por %%mm7, %%mm1		\n\t"
		"pxor %%mm2, %%mm0		\n\t"
		"pxor %%mm3, %%mm1		\n\t"
		"psubw %%mm2, %%mm0		\n\t"
		"psubw %%mm3, %%mm1		\n\t"
		"pandn %%mm0, %%mm4		\n\t"
		"pandn %%mm1, %%mm5		\n\t"
		"movq %%mm4, (%0, %%eax)	\n\t"
		"movq %%mm5, 8(%0, %%eax)	\n\t"

		"addl $16, %%eax		\n\t"
		"js 1b				\n\t"
		::"r" (block+nCoeffs), "r"(quant_matrix+nCoeffs), "g" (qscale), "g" (-2*nCoeffs)