1/* 2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder 3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file libavcodec/x86/h264_i386.h 24 * H.264 / AVC / MPEG4 part10 codec. 25 * non-MMX i386-specific optimizations for H.264 26 * @author Michael Niedermayer <michaelni@gmx.at> 27 */ 28 29#ifndef AVCODEC_X86_H264_I386_H 30#define AVCODEC_X86_H264_I386_H 31 32#include "libavcodec/cabac.h" 33 34//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet 35//as that would make optimization work hard) 36#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) 37static int decode_significance_x86(CABACContext *c, int max_coeff, 38 uint8_t *significant_coeff_ctx_base, 39 int *index){ 40 void *end= significant_coeff_ctx_base + max_coeff - 1; 41 int minusstart= -(int)significant_coeff_ctx_base; 42 int minusindex= 4-(int)index; 43 int coeff_count; 44 __asm__ volatile( 45 "movl "RANGE "(%3), %%esi \n\t" 46 "movl "LOW "(%3), %%ebx \n\t" 47 48 "2: \n\t" 49 50 BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", 51 "%%bx", "%%esi", "%%eax", "%%al") 52 53 "test $1, %%edx \n\t" 54 " jz 3f \n\t" 55 56 BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", 57 "%%bx", "%%esi", "%%eax", "%%al") 58 59 "mov %2, %%"REG_a" \n\t" 60 "movl %4, %%ecx \n\t" 61 "add %1, %%"REG_c" \n\t" 62 "movl %%ecx, (%%"REG_a") \n\t" 63 64 "test $1, %%edx \n\t" 65 " jnz 4f \n\t" 66 67 "add $4, %%"REG_a" \n\t" 68 "mov %%"REG_a", %2 \n\t" 69 70 "3: \n\t" 71 "add $1, %1 \n\t" 72 "cmp %5, %1 \n\t" 73 " jb 2b \n\t" 74 "mov %2, %%"REG_a" \n\t" 75 "movl %4, %%ecx \n\t" 76 "add %1, %%"REG_c" \n\t" 77 "movl %%ecx, (%%"REG_a") \n\t" 78 "4: \n\t" 79 "add %6, %%eax \n\t" 80 "shr $2, %%eax \n\t" 81 82 "movl %%esi, "RANGE "(%3) \n\t" 83 "movl %%ebx, "LOW "(%3) \n\t" 84 :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index) 85 :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex) 86 : "%"REG_c, "%ebx", "%edx", "%esi", "memory" 87 ); 88 return coeff_count; 89} 90 91static int decode_significance_8x8_x86(CABACContext *c, 92 uint8_t *significant_coeff_ctx_base, 93 int *index, const uint8_t *sig_off){ 94 int minusindex= 4-(int)index; 95 int coeff_count; 96 x86_reg last=0; 97 __asm__ volatile( 98 "movl "RANGE "(%3), %%esi \n\t" 99 "movl "LOW "(%3), %%ebx \n\t" 100 101 "mov %1, %%"REG_D" \n\t" 102 "2: \n\t" 103 104 "mov %6, %%"REG_a" \n\t" 105 "movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t" 106 "add %5, %%"REG_D" \n\t" 107 108 BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", 109 "%%bx", "%%esi", "%%eax", "%%al") 110 111 "mov %1, %%edi \n\t" 112 "test $1, %%edx \n\t" 113 " jz 3f \n\t" 114 115 "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t" 116 "add %5, %%"REG_D" \n\t" 117 118 BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx", 119 "%%bx", "%%esi", "%%eax", "%%al") 120 121 "mov %2, %%"REG_a" \n\t" 122 "mov %1, %%edi \n\t" 123 "movl %%edi, (%%"REG_a") \n\t" 124 125 "test $1, %%edx \n\t" 126 " jnz 4f \n\t" 127 128 "add $4, %%"REG_a" \n\t" 129 "mov %%"REG_a", %2 \n\t" 130 131 "3: \n\t" 132 "addl $1, %%edi \n\t" 133 "mov %%edi, %1 \n\t" 134 "cmpl $63, %%edi \n\t" 135 " jb 2b \n\t" 136 "mov %2, %%"REG_a" \n\t" 137 "movl %%edi, (%%"REG_a") \n\t" 138 "4: \n\t" 139 "addl %4, %%eax \n\t" 140 "shr $2, %%eax \n\t" 141 142 "movl %%esi, "RANGE "(%3) \n\t" 143 "movl %%ebx, "LOW "(%3) \n\t" 144 :"=&a"(coeff_count),"+m"(last), "+m"(index) 145 :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off) 146 : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory" 147 ); 148 return coeff_count; 149} 150#endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */ 151 /* !defined(BROKEN_RELOCATIONS) */ 152 153#endif /* AVCODEC_X86_H264_I386_H */ 154