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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 "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 ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
  37 static int decode_significance_x86(CABACContext *c, int max_coeff,
  38                                    uint8_t *significant_coeff_ctx_base,
  39                                    int *index, x86_reg last_off){
  40     void *end= significant_coeff_ctx_base + max_coeff - 1;
  41     int minusstart= -(int)significant_coeff_ctx_base;
  42     int minusindex= 4-(int)index;
  43     int coeff_count;
  44     __asm__ volatile(
  45         "movl "RANGE    "(%3), %%esi            \n\t"
  46         "movl "LOW      "(%3), %%ebx            \n\t"
  47
  48         "2:                                     \n\t"
  49
  50         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
  51                              "%%bx", "%%esi", "%%eax", "%%al")
  52
  53         "test $1, %%edx                         \n\t"
  54         " jz 3f                                 \n\t"
  55         "add  %7, %1                            \n\t"
  56
  57         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
  58                              "%%bx", "%%esi", "%%eax", "%%al")
  59
  60         "sub  %7, %1                            \n\t"
  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), "m"(last_off)
  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, x86_reg last_off, 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         "add %7, %%"REG_D"                      \n\t"
 120
 121         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
 122                              "%%bx", "%%esi", "%%eax", "%%al")
 123
 124         "mov %2, %%"REG_a"                      \n\t"
 125         "mov %1, %%edi                          \n\t"
 126         "movl %%edi, (%%"REG_a")                \n\t"
 127
 128         "test $1, %%edx                         \n\t"
 129         " jnz 4f                                \n\t"
 130
 131         "add $4, %%"REG_a"                      \n\t"
 132         "mov %%"REG_a", %2                      \n\t"
 133
 134         "3:                                     \n\t"
 135         "addl $1, %%edi                         \n\t"
 136         "mov %%edi, %1                          \n\t"
 137         "cmpl $63, %%edi                        \n\t"
 138         " jb 2b                                 \n\t"
 139         "mov %2, %%"REG_a"                      \n\t"
 140         "movl %%edi, (%%"REG_a")                \n\t"
 141         "4:                                     \n\t"
 142         "addl %4, %%eax                         \n\t"
 143         "shr $2, %%eax                          \n\t"
 144
 145         "movl %%esi, "RANGE    "(%3)            \n\t"
 146         "movl %%ebx, "LOW      "(%3)            \n\t"
 147         :"=&a"(coeff_count),"+m"(last), "+m"(index)
 148         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off)
 149         : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
 150     );
 151     return coeff_count;
 152 }
 153 #endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
 154        /* !defined(BROKEN_RELOCATIONS) */
 155
 156 #endif /* AVCODEC_X86_H264_I386_H */