| /* |
| * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder |
| * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file libavcodec/x86/h264_i386.h |
| * 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 */ |