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   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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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
  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 <stddef.h>
  33
  34 #include "libavcodec/cabac.h"
  35
  36 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
  37 //as that would make optimization work hard)
  38 #if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
  39 static int decode_significance_x86(CABACContext *c, int max_coeff,
  40                                    uint8_t *significant_coeff_ctx_base,
  41                                    int *index, x86_reg last_off){
  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 %a8(%3), %%esi                    \n\t"
  48         "movl %a9(%3), %%ebx                    \n\t"
  49
  50         "2:                                     \n\t"
  51
  52         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
  53                              "%%bx", "%%esi", "%%eax", "%%al", "%a10")
  54
  55         "test $1, %%edx                         \n\t"
  56         " jz 3f                                 \n\t"
  57         "add  %7, %1                            \n\t"
  58
  59         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
  60                              "%%bx", "%%esi", "%%eax", "%%al", "%a10")
  61
  62         "sub  %7, %1                            \n\t"
  63         "mov  %2, %%"REG_a"                     \n\t"
  64         "movl %4, %%ecx                         \n\t"
  65         "add  %1, %%"REG_c"                     \n\t"
  66         "movl %%ecx, (%%"REG_a")                \n\t"
  67
  68         "test $1, %%edx                         \n\t"
  69         " jnz 4f                                \n\t"
  70
  71         "add  $4, %%"REG_a"                     \n\t"
  72         "mov  %%"REG_a", %2                     \n\t"
  73
  74         "3:                                     \n\t"
  75         "add  $1, %1                            \n\t"
  76         "cmp  %5, %1                            \n\t"
  77         " jb 2b                                 \n\t"
  78         "mov  %2, %%"REG_a"                     \n\t"
  79         "movl %4, %%ecx                         \n\t"
  80         "add  %1, %%"REG_c"                     \n\t"
  81         "movl %%ecx, (%%"REG_a")                \n\t"
  82         "4:                                     \n\t"
  83         "add  %6, %%eax                         \n\t"
  84         "shr $2, %%eax                          \n\t"
  85
  86         "movl %%esi, %a8(%3)                    \n\t"
  87         "movl %%ebx, %a9(%3)                    \n\t"
  88         :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
  89         :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
  90          "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
  91          "i"(offsetof(CABACContext, bytestream))
  92         : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
  93     );
  94     return coeff_count;
  95 }
  96
  97 static int decode_significance_8x8_x86(CABACContext *c,
  98                                        uint8_t *significant_coeff_ctx_base,
  99                                        int *index, x86_reg last_off, const uint8_t *sig_off){
 100     int minusindex= 4-(int)index;
 101     int coeff_count;
 102     x86_reg last=0;
 103     __asm__ volatile(
 104         "movl %a8(%3), %%esi                    \n\t"
 105         "movl %a9(%3), %%ebx                    \n\t"
 106
 107         "mov %1, %%"REG_D"                      \n\t"
 108         "2:                                     \n\t"
 109
 110         "mov %6, %%"REG_a"                      \n\t"
 111         "movzbl (%%"REG_a", %%"REG_D"), %%edi   \n\t"
 112         "add %5, %%"REG_D"                      \n\t"
 113
 114         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
 115                              "%%bx", "%%esi", "%%eax", "%%al", "%a10")
 116
 117         "mov %1, %%edi                          \n\t"
 118         "test $1, %%edx                         \n\t"
 119         " jz 3f                                 \n\t"
 120
 121         "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
 122         "add %5, %%"REG_D"                      \n\t"
 123         "add %7, %%"REG_D"                      \n\t"
 124
 125         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
 126                              "%%bx", "%%esi", "%%eax", "%%al", "%a10")
 127
 128         "mov %2, %%"REG_a"                      \n\t"
 129         "mov %1, %%edi                          \n\t"
 130         "movl %%edi, (%%"REG_a")                \n\t"
 131
 132         "test $1, %%edx                         \n\t"
 133         " jnz 4f                                \n\t"
 134
 135         "add $4, %%"REG_a"                      \n\t"
 136         "mov %%"REG_a", %2                      \n\t"
 137
 138         "3:                                     \n\t"
 139         "addl $1, %%edi                         \n\t"
 140         "mov %%edi, %1                          \n\t"
 141         "cmpl $63, %%edi                        \n\t"
 142         " jb 2b                                 \n\t"
 143         "mov %2, %%"REG_a"                      \n\t"
 144         "movl %%edi, (%%"REG_a")                \n\t"
 145         "4:                                     \n\t"
 146         "addl %4, %%eax                         \n\t"
 147         "shr $2, %%eax                          \n\t"
 148
 149         "movl %%esi, %a8(%3)                    \n\t"
 150         "movl %%ebx, %a9(%3)                    \n\t"
 151         :"=&a"(coeff_count),"+m"(last), "+m"(index)
 152         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off),
 153          "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
 154          "i"(offsetof(CABACContext, bytestream))
 155         : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
 156     );
 157     return coeff_count;
 158 }
 159 #endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
 160        /* !defined(BROKEN_RELOCATIONS) */
 161
 162 #endif /* AVCODEC_X86_H264_I386_H */