1/* 2 * Copyright (c) 2000,2001 Fabrice Bellard 3 * 4 * MMI optimization by Leon van Stuivenberg 5 * 6 * This file is part of FFmpeg. 7 * 8 * FFmpeg is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2.1 of the License, or (at your option) any later version. 12 * 13 * FFmpeg is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with FFmpeg; if not, write to the Free Software 20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 21 */ 22 23#include "libavcodec/avcodec.h" 24#include "libavcodec/dsputil.h" 25#include "libavcodec/mpegvideo.h" 26 27static void dct_unquantize_h263_mmi(MpegEncContext *s, 28 DCTELEM *block, int n, int qscale) 29{ 30 int level=0, qmul, qadd; 31 int nCoeffs; 32 33 assert(s->block_last_index[n]>=0); 34 35 qadd = (qscale - 1) | 1; 36 qmul = qscale << 1; 37 38 if (s->mb_intra) { 39 if (!s->h263_aic) { 40 if (n < 4) 41 level = block[0] * s->y_dc_scale; 42 else 43 level = block[0] * s->c_dc_scale; 44 }else { 45 qadd = 0; 46 level = block[0]; 47 } 48 nCoeffs= 63; //does not always use zigzag table 49 } else { 50 nCoeffs= s->intra_scantable.raster_end[ s->block_last_index[n] ]; 51 } 52 53 __asm__ volatile( 54 "add $14, $0, %3 \n\t" 55 "pcpyld $8, %0, %0 \n\t" 56 "pcpyh $8, $8 \n\t" //r8 = qmul 57 "pcpyld $9, %1, %1 \n\t" 58 "pcpyh $9, $9 \n\t" //r9 = qadd 59 ".p2align 2 \n\t" 60 "1: \n\t" 61 "lq $10, 0($14) \n\t" //r10 = level 62 "addi $14, $14, 16 \n\t" //block+=8 63 "addi %2, %2, -8 \n\t" 64 "pcgth $11, $0, $10 \n\t" //r11 = level < 0 ? -1 : 0 65 "pcgth $12, $10, $0 \n\t" //r12 = level > 0 ? -1 : 0 66 "por $12, $11, $12 \n\t" 67 "pmulth $10, $10, $8 \n\t" 68 "paddh $13, $9, $11 \n\t" 69 "pxor $13, $13, $11 \n\t" //r13 = level < 0 ? -qadd : qadd 70 "pmfhl.uw $11 \n\t" 71 "pinteh $10, $11, $10 \n\t" //r10 = level * qmul 72 "paddh $10, $10, $13 \n\t" 73 "pand $10, $10, $12 \n\t" 74 "sq $10, -16($14) \n\t" 75 "bgez %2, 1b \n\t" 76 :: "r"(qmul), "r" (qadd), "r" (nCoeffs), "r" (block) : "$8", "$9", "$10", "$11", "$12", "$13", "$14", "memory" ); 77 78 if(s->mb_intra) 79 block[0]= level; 80} 81 82 83void MPV_common_init_mmi(MpegEncContext *s) 84{ 85 s->dct_unquantize_h263_intra = 86 s->dct_unquantize_h263_inter = dct_unquantize_h263_mmi; 87} 88 89 90