/* * The simplest mpeg encoder (well, it was the simplest!) * Copyright (c) 2000,2001 Gerard Lantau. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Optimized for ia32 cpus by Nick Kurshev */ void MPV_frame_start(MpegEncContext *s) { if (s->pict_type == B_TYPE) { __asm __volatile( "movl (%1), %%eax\n\t" "movl 4(%1), %%edx\n\t" "movl 8(%1), %%ecx\n\t" "movl %%eax, (%0)\n\t" "movl %%edx, 4(%0)\n\t" "movl %%ecx, 8(%0)\n\t" : :"r"(s->current_picture), "r"(s->aux_picture) :"eax","edx","ecx","memory"); } else { /* swap next and last */ __asm __volatile( "movl (%1), %%eax\n\t" "movl 4(%1), %%edx\n\t" "movl 8(%1), %%ecx\n\t" "xchgl (%0), %%eax\n\t" "xchgl 4(%0), %%edx\n\t" "xchgl 8(%0), %%ecx\n\t" "movl %%eax, (%1)\n\t" "movl %%edx, 4(%1)\n\t" "movl %%ecx, 8(%1)\n\t" "movl %%eax, (%2)\n\t" "movl %%edx, 4(%2)\n\t" "movl %%ecx, 8(%2)\n\t" : :"r"(s->last_picture), "r"(s->next_picture), "r"(s->current_picture) :"eax","edx","ecx","memory"); } } static void dct_unquantize(MpegEncContext *s, DCTELEM *block, int n, int qscale); #ifdef HAVE_MMX static const unsigned long long int mm_wabs __attribute__ ((aligned(8))) = 0xffffffffffffffffULL; static const unsigned long long int mm_wone __attribute__ ((aligned(8))) = 0x0001000100010001ULL; /* 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 */ #ifdef BIN_PORTABILITY static void dct_unquantize_mmx #else #define HAVE_DCT_UNQUANTIZE 1 static void dct_unquantize #endif (MpegEncContext *s,DCTELEM *block, int n, int qscale) { int i, level; const UINT16 *quant_matrix; if (s->mb_intra) { if (n < 4) block[0] = block[0] * s->y_dc_scale; else block[0] = block[0] * s->c_dc_scale; if (s->out_format == FMT_H263) { i = 1; goto unquant_even; } /* XXX: only mpeg1 */ quant_matrix = s->intra_matrix; i=1; /* Align on 4 elements boundary */ while(i&3) { level = block[i]; if (level) { if (level < 0) level = -level; level = (int)(level * qscale * quant_matrix[i]) >> 3; level = (level - 1) | 1; if (block[i] < 0) level = -level; block[i] = level; } i++; } __asm __volatile( "movd %0, %%mm6\n\t" /* mm6 = qscale | 0 */ "punpckldq %%mm6, %%mm6\n\t" /* mm6 = qscale | qscale */ "movq %2, %%mm4\n\t" "movq %%mm6, %%mm7\n\t" "movq %1, %%mm5\n\t" "packssdw %%mm6, %%mm7\n\t" /* mm7 = qscale | qscale | qscale | qscale */ "pxor %%mm6, %%mm6\n\t" ::"g"(qscale),"m"(mm_wone),"m"(mm_wabs):"memory"); for(;i<64;i+=4) { __asm __volatile( "movq %1, %%mm0\n\t" "movq %%mm7, %%mm1\n\t" "movq %%mm0, %%mm2\n\t" "movq %%mm0, %%mm3\n\t" "pcmpgtw %%mm6, %%mm2\n\t" "pmullw %2, %%mm1\n\t" "pandn %%mm4, %%mm2\n\t" "por %%mm5, %%mm2\n\t" "pmullw %%mm2, %%mm0\n\t" /* mm0 = abs(block[i]). */ "pcmpeqw %%mm6, %%mm3\n\t" "pmullw %%mm0, %%mm1\n\t" "psraw $3, %%mm1\n\t" "psubw %%mm5, %%mm1\n\t" /* block[i] --; */ "pandn %%mm4, %%mm3\n\t" /* fake of pcmpneqw : mm0 != 0 then mm1 = -1 */ "por %%mm5, %%mm1\n\t" /* block[i] |= 1 */ "pmullw %%mm2, %%mm1\n\t" /* change signs again */ "pand %%mm3, %%mm1\n\t" /* nullify if was zero */ "movq %%mm1, %0" :"=m"(block[i]) :"m"(block[i]), "m"(quant_matrix[i]) :"memory"); } } else { i = 0; unquant_even: quant_matrix = s->non_intra_matrix; /* Align on 4 elements boundary */ while(i&3) { level = block[i]; if (level) { if (level < 0) level = -level; level = (((level << 1) + 1) * qscale * ((int) quant_matrix[i])) >> 4; level = (level - 1) | 1; if(block[i] < 0) level = -level; block[i] = level; } i++; } __asm __volatile( "movd %0, %%mm6\n\t" /* mm6 = qscale | 0 */ "punpckldq %%mm6, %%mm6\n\t" /* mm6 = qscale | qscale */ "movq %2, %%mm4\n\t" "movq %%mm6, %%mm7\n\t" "movq %1, %%mm5\n\t" "packssdw %%mm6, %%mm7\n\t" /* mm7 = qscale | qscale | qscale | qscale */ "pxor %%mm6, %%mm6\n\t" ::"g"(qscale),"m"(mm_wone),"m"(mm_wabs):"memory"); for(;i<64;i+=4) { __asm __volatile( "movq %1, %%mm0\n\t" "movq %%mm7, %%mm1\n\t" "movq %%mm0, %%mm2\n\t" "movq %%mm0, %%mm3\n\t" "pcmpgtw %%mm6, %%mm2\n\t" "pmullw %2, %%mm1\n\t" "pandn %%mm4, %%mm2\n\t" "por %%mm5, %%mm2\n\t" "pmullw %%mm2, %%mm0\n\t" /* mm0 = abs(block[i]). */ "psllw $1, %%mm0\n\t" /* block[i] <<= 1 */ "paddw %%mm5, %%mm0\n\t" /* block[i] ++ */ "pmullw %%mm0, %%mm1\n\t" "psraw $4, %%mm1\n\t" "pcmpeqw %%mm6, %%mm3\n\t" "psubw %%mm5, %%mm1\n\t" /* block[i] --; */ "pandn %%mm4, %%mm3\n\t" /* fake of pcmpneqw : mm0 != 0 then mm1 = -1 */ "por %%mm5, %%mm1\n\t" /* block[i] |= 1 */ "pmullw %%mm2, %%mm1\n\t" /* change signs again */ "pand %%mm3, %%mm1\n\t" /* nullify if was zero */ "movq %%mm1, %0" :"=m"(block[i]) :"m"(block[i]), "m"(quant_matrix[i]) :"memory"); } } } #ifdef BIN_PORTABILITY static void (*dct_unquantize_ptr)(MpegEncContext *s, DCTELEM *block, int n, int qscale); void MPV_common_init_mmx(void) { int mm_flags; mm_flags = mm_support(); if (mm_flags & MM_MMX) { dct_unquantize_ptr = dct_unquantize_mmx; } else { dct_unquantize_ptr = dct_unquantize; } } #define DCT_UNQUANTIZE(a,b,c,d) (*dct_unquantize_ptr)(a,b,c,d) #else #define DCT_UNQUANTIZE(a,b,c,d) dct_unquantize(a,b,c,d) #endif /* BIN_PORTABILITY */ #endif /* HAVE_MMX */