mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
153 lines
6.1 KiB
153 lines
6.1 KiB
/* |
|
* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder |
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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 2.1 of the License, or (at your option) any later version. |
|
* |
|
* Libav 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 Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
/** |
|
* @file |
|
* H.264 / AVC / MPEG4 part10 codec. |
|
* non-MMX i386-specific optimizations for H.264 |
|
* @author Michael Niedermayer <michaelni@gmx.at> |
|
*/ |
|
|
|
#ifndef AVCODEC_X86_H264_I386_H |
|
#define AVCODEC_X86_H264_I386_H |
|
|
|
#include "libavcodec/cabac.h" |
|
|
|
//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet |
|
//as that would make optimization work hard) |
|
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS) |
|
static int decode_significance_x86(CABACContext *c, int max_coeff, |
|
uint8_t *significant_coeff_ctx_base, |
|
int *index){ |
|
void *end= significant_coeff_ctx_base + max_coeff - 1; |
|
int minusstart= -(int)significant_coeff_ctx_base; |
|
int minusindex= 4-(int)index; |
|
int coeff_count; |
|
__asm__ volatile( |
|
"movl "RANGE "(%3), %%esi \n\t" |
|
"movl "LOW "(%3), %%ebx \n\t" |
|
|
|
"2: \n\t" |
|
|
|
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", |
|
"%%bx", "%%esi", "%%eax", "%%al") |
|
|
|
"test $1, %%edx \n\t" |
|
" jz 3f \n\t" |
|
|
|
BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", |
|
"%%bx", "%%esi", "%%eax", "%%al") |
|
|
|
"mov %2, %%"REG_a" \n\t" |
|
"movl %4, %%ecx \n\t" |
|
"add %1, %%"REG_c" \n\t" |
|
"movl %%ecx, (%%"REG_a") \n\t" |
|
|
|
"test $1, %%edx \n\t" |
|
" jnz 4f \n\t" |
|
|
|
"add $4, %%"REG_a" \n\t" |
|
"mov %%"REG_a", %2 \n\t" |
|
|
|
"3: \n\t" |
|
"add $1, %1 \n\t" |
|
"cmp %5, %1 \n\t" |
|
" jb 2b \n\t" |
|
"mov %2, %%"REG_a" \n\t" |
|
"movl %4, %%ecx \n\t" |
|
"add %1, %%"REG_c" \n\t" |
|
"movl %%ecx, (%%"REG_a") \n\t" |
|
"4: \n\t" |
|
"add %6, %%eax \n\t" |
|
"shr $2, %%eax \n\t" |
|
|
|
"movl %%esi, "RANGE "(%3) \n\t" |
|
"movl %%ebx, "LOW "(%3) \n\t" |
|
:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index) |
|
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex) |
|
: "%"REG_c, "%ebx", "%edx", "%esi", "memory" |
|
); |
|
return coeff_count; |
|
} |
|
|
|
static int decode_significance_8x8_x86(CABACContext *c, |
|
uint8_t *significant_coeff_ctx_base, |
|
int *index, const uint8_t *sig_off){ |
|
int minusindex= 4-(int)index; |
|
int coeff_count; |
|
x86_reg last=0; |
|
__asm__ volatile( |
|
"movl "RANGE "(%3), %%esi \n\t" |
|
"movl "LOW "(%3), %%ebx \n\t" |
|
|
|
"mov %1, %%"REG_D" \n\t" |
|
"2: \n\t" |
|
|
|
"mov %6, %%"REG_a" \n\t" |
|
"movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t" |
|
"add %5, %%"REG_D" \n\t" |
|
|
|
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", |
|
"%%bx", "%%esi", "%%eax", "%%al") |
|
|
|
"mov %1, %%edi \n\t" |
|
"test $1, %%edx \n\t" |
|
" jz 3f \n\t" |
|
|
|
"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t" |
|
"add %5, %%"REG_D" \n\t" |
|
|
|
BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx", |
|
"%%bx", "%%esi", "%%eax", "%%al") |
|
|
|
"mov %2, %%"REG_a" \n\t" |
|
"mov %1, %%edi \n\t" |
|
"movl %%edi, (%%"REG_a") \n\t" |
|
|
|
"test $1, %%edx \n\t" |
|
" jnz 4f \n\t" |
|
|
|
"add $4, %%"REG_a" \n\t" |
|
"mov %%"REG_a", %2 \n\t" |
|
|
|
"3: \n\t" |
|
"addl $1, %%edi \n\t" |
|
"mov %%edi, %1 \n\t" |
|
"cmpl $63, %%edi \n\t" |
|
" jb 2b \n\t" |
|
"mov %2, %%"REG_a" \n\t" |
|
"movl %%edi, (%%"REG_a") \n\t" |
|
"4: \n\t" |
|
"addl %4, %%eax \n\t" |
|
"shr $2, %%eax \n\t" |
|
|
|
"movl %%esi, "RANGE "(%3) \n\t" |
|
"movl %%ebx, "LOW "(%3) \n\t" |
|
:"=&a"(coeff_count),"+m"(last), "+m"(index) |
|
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off) |
|
: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory" |
|
); |
|
return coeff_count; |
|
} |
|
#endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */ |
|
/* !defined(BROKEN_RELOCATIONS) */ |
|
|
|
#endif /* AVCODEC_X86_H264_I386_H */
|
|
|