git.sesse.net Git - ffmpeg/blob - libavcodec/x86/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
  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 #include "cabac.h"
  36
  37 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
  38 //as that would make optimization work hard)
  39 #if ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
  40 static int decode_significance_x86(CABACContext *c, int max_coeff,
  41                                    uint8_t *significant_coeff_ctx_base,
  42                                    int *index, x86_reg last_off){
  43     void *end= significant_coeff_ctx_base + max_coeff - 1;
  44     int minusstart= -(intptr_t)significant_coeff_ctx_base;
  45     int minusindex= 4-(intptr_t)index;
  46     int bit;
  47     x86_reg coeff_count;
  48     __asm__ volatile(
  49         "2:                                     \n\t"
  50
  51         BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
  52                              "%w3", "%5", "%k0", "%b0", "%a11")
  53
  54         "test $1, %4                            \n\t"
  55         " jz 3f                                 \n\t"
  56         "add  %10, %1                           \n\t"
  57
  58         BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
  59                              "%w3", "%5", "%k0", "%b0", "%a11")
  60
  61         "sub  %10, %1                           \n\t"
  62         "mov  %2, %0                            \n\t"
  63         "movl %7, %%ecx                         \n\t"
  64         "add  %1, %%"REG_c"                     \n\t"
  65         "movl %%ecx, (%0)                       \n\t"
  66
  67         "test $1, %4                            \n\t"
  68         " jnz 4f                                \n\t"
  69
  70         "add"OPSIZE"  $4, %2                    \n\t"
  71
  72         "3:                                     \n\t"
  73         "add  $1, %1                            \n\t"
  74         "cmp  %8, %1                            \n\t"
  75         " jb 2b                                 \n\t"
  76         "mov  %2, %0                            \n\t"
  77         "movl %7, %%ecx                         \n\t"
  78         "add  %1, %%"REG_c"                     \n\t"
  79         "movl %%ecx, (%0)                       \n\t"
  80         "4:                                     \n\t"
  81         "add  %9, %k0                           \n\t"
  82         "shr $2, %k0                            \n\t"
  83         :"=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
  84          "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
  85         :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
  86          "i"(offsetof(CABACContext, bytestream))
  87         : "%"REG_c, "memory"
  88     );
  89     return coeff_count;
  90 }
  91
  92 static int decode_significance_8x8_x86(CABACContext *c,
  93                                        uint8_t *significant_coeff_ctx_base,
  94                                        int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
  95     int minusindex= 4-(intptr_t)index;
  96     int bit;
  97     x86_reg coeff_count;
  98     x86_reg last=0;
  99     x86_reg state;
 100     __asm__ volatile(
 101         "mov %1, %6                             \n\t"
 102         "2:                                     \n\t"
 103
 104         "mov %10, %0                            \n\t"
 105         "movzbl (%0, %6), %k6                   \n\t"
 106         "add %9, %6                             \n\t"
 107
 108         BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
 109                              "%w3", "%5", "%k0", "%b0", "%a12")
 110
 111         "mov %1, %k6                            \n\t"
 112         "test $1, %4                            \n\t"
 113         " jz 3f                                 \n\t"
 114
 115         "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%k6), %k6\n\t"
 116         "add %11, %6                            \n\t"
 117
 118         BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
 119                              "%w3", "%5", "%k0", "%b0", "%a12")
 120
 121         "mov %2, %0                             \n\t"
 122         "mov %1, %k6                            \n\t"
 123         "movl %k6, (%0)                         \n\t"
 124
 125         "test $1, %4                            \n\t"
 126         " jnz 4f                                \n\t"
 127
 128         "add"OPSIZE"  $4, %2                    \n\t"
 129
 130         "3:                                     \n\t"
 131         "addl $1, %k6                           \n\t"
 132         "mov %k6, %1                            \n\t"
 133         "cmpl $63, %k6                          \n\t"
 134         " jb 2b                                 \n\t"
 135         "mov %2, %0                             \n\t"
 136         "movl %k6, (%0)                         \n\t"
 137         "4:                                     \n\t"
 138         "addl %8, %k0                           \n\t"
 139         "shr $2, %k0                            \n\t"
 140         :"=&q"(coeff_count),"+m"(last), "+m"(index), "+&r"(c->low), "=&r"(bit),
 141          "+&r"(c->range), "=&r"(state)
 142         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_coeff_ctx_base),
 143          "i"(offsetof(CABACContext, bytestream))
 144         : "%"REG_c, "memory"
 145     );
 146     return coeff_count;
 147 }
 148 #endif /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
 149
 150 #endif /* AVCODEC_X86_H264_I386_H */