git.sesse.net Git - ffmpeg/blob - libavcodec/i386/h264_i386.h

   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 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 FFMPEG_H264_I386_H
  30 #define FFMPEG_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 defined(ARCH_X86) && defined(HAVE_7REGS)     && \
  37     defined(HAVE_EBX_AVAILABLE)                  && \
  38     !defined(BROKEN_RELOCATIONS)
  39 static int decode_significance_x86(CABACContext *c, int max_coeff,
  40                                    uint8_t *significant_coeff_ctx_base,
  41                                    int *index){
  42     void *end= significant_coeff_ctx_base + max_coeff - 1;
  43     int minusstart= -(int)significant_coeff_ctx_base;
  44     int minusindex= 4-(int)index;
  45     int coeff_count;
  46     asm volatile(
  47         "movl "RANGE    "(%3), %%esi            \n\t"
  48         "movl "LOW      "(%3), %%ebx            \n\t"
  49
  50         "2:                                     \n\t"
  51
  52         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
  53                              "%%bx", "%%esi", "%%eax", "%%al")
  54
  55         "test $1, %%edx                         \n\t"
  56         " jz 3f                                 \n\t"
  57
  58         BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx",
  59                              "%%bx", "%%esi", "%%eax", "%%al")
  60
  61         "mov  %2, %%"REG_a"                     \n\t"
  62         "movl %4, %%ecx                         \n\t"
  63         "add  %1, %%"REG_c"                     \n\t"
  64         "movl %%ecx, (%%"REG_a")                \n\t"
  65
  66         "test $1, %%edx                         \n\t"
  67         " jnz 4f                                \n\t"
  68
  69         "add  $4, %%"REG_a"                     \n\t"
  70         "mov  %%"REG_a", %2                     \n\t"
  71
  72         "3:                                     \n\t"
  73         "add  $1, %1                            \n\t"
  74         "cmp  %5, %1                            \n\t"
  75         " jb 2b                                 \n\t"
  76         "mov  %2, %%"REG_a"                     \n\t"
  77         "movl %4, %%ecx                         \n\t"
  78         "add  %1, %%"REG_c"                     \n\t"
  79         "movl %%ecx, (%%"REG_a")                \n\t"
  80         "4:                                     \n\t"
  81         "add  %6, %%eax                         \n\t"
  82         "shr $2, %%eax                          \n\t"
  83
  84         "movl %%esi, "RANGE    "(%3)            \n\t"
  85         "movl %%ebx, "LOW      "(%3)            \n\t"
  86         :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
  87         :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)
  88         : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
  89     );
  90     return coeff_count;
  91 }
  92
  93 static int decode_significance_8x8_x86(CABACContext *c,
  94                                        uint8_t *significant_coeff_ctx_base,
  95                                        int *index, const uint8_t *sig_off){
  96     int minusindex= 4-(int)index;
  97     int coeff_count;
  98     x86_reg last=0;
  99     asm volatile(
 100         "movl "RANGE    "(%3), %%esi            \n\t"
 101         "movl "LOW      "(%3), %%ebx            \n\t"
 102
 103         "mov %1, %%"REG_D"                      \n\t"
 104         "2:                                     \n\t"
 105
 106         "mov %6, %%"REG_a"                      \n\t"
 107         "movzbl (%%"REG_a", %%"REG_D"), %%edi   \n\t"
 108         "add %5, %%"REG_D"                      \n\t"
 109
 110         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
 111                              "%%bx", "%%esi", "%%eax", "%%al")
 112
 113         "mov %1, %%edi                          \n\t"
 114         "test $1, %%edx                         \n\t"
 115         " jz 3f                                 \n\t"
 116
 117         "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
 118         "add %5, %%"REG_D"                      \n\t"
 119
 120         BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx",
 121                              "%%bx", "%%esi", "%%eax", "%%al")
 122
 123         "mov %2, %%"REG_a"                      \n\t"
 124         "mov %1, %%edi                          \n\t"
 125         "movl %%edi, (%%"REG_a")                \n\t"
 126
 127         "test $1, %%edx                         \n\t"
 128         " jnz 4f                                \n\t"
 129
 130         "add $4, %%"REG_a"                      \n\t"
 131         "mov %%"REG_a", %2                      \n\t"
 132
 133         "3:                                     \n\t"
 134         "addl $1, %%edi                         \n\t"
 135         "mov %%edi, %1                          \n\t"
 136         "cmpl $63, %%edi                        \n\t"
 137         " jb 2b                                 \n\t"
 138         "mov %2, %%"REG_a"                      \n\t"
 139         "movl %%edi, (%%"REG_a")                \n\t"
 140         "4:                                     \n\t"
 141         "addl %4, %%eax                         \n\t"
 142         "shr $2, %%eax                          \n\t"
 143
 144         "movl %%esi, "RANGE    "(%3)            \n\t"
 145         "movl %%ebx, "LOW      "(%3)            \n\t"
 146         :"=&a"(coeff_count),"+m"(last), "+m"(index)
 147         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)
 148         : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
 149     );
 150     return coeff_count;
 151 }
 152 #endif /* defined(ARCH_X86) && defined(HAVE_7REGS) &&                 */
 153        /* defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */
 154
 155 #endif /* FFMPEG_H264_I386_H */