mirror of
https://github.com/FFmpeg/FFmpeg.git
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156 lines
6.2 KiB
C
156 lines
6.2 KiB
C
/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file h264_i386.h
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* H.264 / AVC / MPEG4 part10 codec.
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* non-MMX i386-specific optimizations for H.264
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#ifndef FFMPEG_H264_I386_H
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#define FFMPEG_H264_I386_H
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#include "libavcodec/cabac.h"
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//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
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//as that would make optimization work hard)
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#if defined(ARCH_X86) && defined(HAVE_7REGS) && \
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defined(HAVE_EBX_AVAILABLE) && \
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!defined(BROKEN_RELOCATIONS)
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static int decode_significance_x86(CABACContext *c, int max_coeff,
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uint8_t *significant_coeff_ctx_base,
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int *index){
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void *end= significant_coeff_ctx_base + max_coeff - 1;
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int minusstart= -(int)significant_coeff_ctx_base;
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int minusindex= 4-(int)index;
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int coeff_count;
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asm volatile(
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"movl "RANGE "(%3), %%esi \n\t"
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"movl "LOW "(%3), %%ebx \n\t"
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"2: \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"test $1, %%edx \n\t"
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" jz 3f \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"mov %2, %%"REG_a" \n\t"
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"movl %4, %%ecx \n\t"
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"add %1, %%"REG_c" \n\t"
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"movl %%ecx, (%%"REG_a") \n\t"
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"test $1, %%edx \n\t"
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" jnz 4f \n\t"
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"add $4, %%"REG_a" \n\t"
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"mov %%"REG_a", %2 \n\t"
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"3: \n\t"
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"add $1, %1 \n\t"
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"cmp %5, %1 \n\t"
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" jb 2b \n\t"
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"mov %2, %%"REG_a" \n\t"
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"movl %4, %%ecx \n\t"
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"add %1, %%"REG_c" \n\t"
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"movl %%ecx, (%%"REG_a") \n\t"
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"4: \n\t"
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"add %6, %%eax \n\t"
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"shr $2, %%eax \n\t"
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"movl %%esi, "RANGE "(%3) \n\t"
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"movl %%ebx, "LOW "(%3) \n\t"
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:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
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:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)
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: "%"REG_c, "%ebx", "%edx", "%esi", "memory"
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);
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return coeff_count;
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}
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static int decode_significance_8x8_x86(CABACContext *c,
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uint8_t *significant_coeff_ctx_base,
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int *index, const uint8_t *sig_off){
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int minusindex= 4-(int)index;
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int coeff_count;
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x86_reg last=0;
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asm volatile(
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"movl "RANGE "(%3), %%esi \n\t"
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"movl "LOW "(%3), %%ebx \n\t"
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"mov %1, %%"REG_D" \n\t"
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"2: \n\t"
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"mov %6, %%"REG_a" \n\t"
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"movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t"
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"add %5, %%"REG_D" \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"mov %1, %%edi \n\t"
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"test $1, %%edx \n\t"
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" jz 3f \n\t"
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"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
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"add %5, %%"REG_D" \n\t"
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BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx",
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"%%bx", "%%esi", "%%eax", "%%al")
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"mov %2, %%"REG_a" \n\t"
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"mov %1, %%edi \n\t"
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"movl %%edi, (%%"REG_a") \n\t"
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"test $1, %%edx \n\t"
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" jnz 4f \n\t"
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"add $4, %%"REG_a" \n\t"
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"mov %%"REG_a", %2 \n\t"
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"3: \n\t"
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"addl $1, %%edi \n\t"
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"mov %%edi, %1 \n\t"
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"cmpl $63, %%edi \n\t"
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" jb 2b \n\t"
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"mov %2, %%"REG_a" \n\t"
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"movl %%edi, (%%"REG_a") \n\t"
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"4: \n\t"
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"addl %4, %%eax \n\t"
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"shr $2, %%eax \n\t"
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"movl %%esi, "RANGE "(%3) \n\t"
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"movl %%ebx, "LOW "(%3) \n\t"
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:"=&a"(coeff_count),"+m"(last), "+m"(index)
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:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)
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: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
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);
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return coeff_count;
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}
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#endif /* defined(ARCH_X86) && defined(HAVE_7REGS) && */
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/* defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */
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#endif /* FFMPEG_H264_I386_H */
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