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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 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 #if HAVE_INLINE_ASM
  38
  39 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
  40 //as that would make optimization work hard)
  41 #if HAVE_7REGS
  42 #define decode_significance decode_significance_x86
  43 static int decode_significance_x86(CABACContext *c, int max_coeff,
  44                                    uint8_t *significant_coeff_ctx_base,
  45                                    int *index, x86_reg last_off){
  46     void *end= significant_coeff_ctx_base + max_coeff - 1;
  47     int minusstart= -(intptr_t)significant_coeff_ctx_base;
  48     int minusindex= 4-(intptr_t)index;
  49     int bit;
  50     x86_reg coeff_count;
  51
  52 #ifdef BROKEN_RELOCATIONS
  53     void *tables;
  54
  55     __asm__ volatile(
  56         "lea   "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
  57         : "=&r"(tables)
  58     );
  59 #endif
  60
  61     __asm__ volatile(
  62         "3:                                     \n\t"
  63
  64         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
  65                              "%5", "%q5", "%k0", "%b0",
  66                              "%a11(%6)", "%a12(%6)", "%a13", "%a14", "%a15", "%16")
  67
  68         "test $1, %4                            \n\t"
  69         " jz 4f                                 \n\t"
  70         "add  %10, %1                           \n\t"
  71
  72         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
  73                              "%5", "%q5", "%k0", "%b0",
  74                              "%a11(%6)", "%a12(%6)", "%a13", "%a14", "%a15", "%16")
  75
  76         "sub  %10, %1                           \n\t"
  77         "mov  %2, %0                            \n\t"
  78         "movl %7, %%ecx                         \n\t"
  79         "add  %1, %%"REG_c"                     \n\t"
  80         "movl %%ecx, (%0)                       \n\t"
  81
  82         "test $1, %4                            \n\t"
  83         " jnz 5f                                \n\t"
  84
  85         "add"OPSIZE"  $4, %2                    \n\t"
  86
  87         "4:                                     \n\t"
  88         "add  $1, %1                            \n\t"
  89         "cmp  %8, %1                            \n\t"
  90         " jb 3b                                 \n\t"
  91         "mov  %2, %0                            \n\t"
  92         "movl %7, %%ecx                         \n\t"
  93         "add  %1, %%"REG_c"                     \n\t"
  94         "movl %%ecx, (%0)                       \n\t"
  95         "5:                                     \n\t"
  96         "add  %9, %k0                           \n\t"
  97         "shr $2, %k0                            \n\t"
  98         : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
  99           "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
 100         : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
 101           "i"(offsetof(CABACContext, bytestream)),
 102           "i"(offsetof(CABACContext, bytestream_end)),
 103           "i"(H264_NORM_SHIFT_OFFSET),
 104           "i"(H264_LPS_RANGE_OFFSET),
 105           "i"(H264_MLPS_STATE_OFFSET) TABLES_ARG
 106         : "%"REG_c, "memory"
 107     );
 108     return coeff_count;
 109 }
 110
 111 #define decode_significance_8x8 decode_significance_8x8_x86
 112 static int decode_significance_8x8_x86(CABACContext *c,
 113                                        uint8_t *significant_coeff_ctx_base,
 114                                        int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
 115     int minusindex= 4-(intptr_t)index;
 116     int bit;
 117     x86_reg coeff_count;
 118     x86_reg last=0;
 119     x86_reg state;
 120
 121 #ifdef BROKEN_RELOCATIONS
 122     void *tables;
 123
 124     __asm__ volatile(
 125         "lea    "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
 126         : "=&r"(tables)
 127     );
 128 #endif
 129
 130     __asm__ volatile(
 131         "mov %1, %6                             \n\t"
 132         "3:                                     \n\t"
 133
 134         "mov %10, %0                            \n\t"
 135         "movzbl (%0, %6), %k6                   \n\t"
 136         "add %9, %6                             \n\t"
 137
 138         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
 139                              "%5", "%q5", "%k0", "%b0",
 140                              "%a12(%7)", "%a13(%7)", "%a14", "%a15", "%a16", "%18")
 141
 142         "mov %1, %k6                            \n\t"
 143         "test $1, %4                            \n\t"
 144         " jz 4f                                 \n\t"
 145
 146 #ifdef BROKEN_RELOCATIONS
 147         "movzbl %a17(%18, %q6), %k6\n\t"
 148 #else
 149         "movzbl "MANGLE(ff_h264_cabac_tables)"+%a17(%k6), %k6\n\t"
 150 #endif
 151         "add %11, %6                            \n\t"
 152
 153         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
 154                              "%5", "%q5", "%k0", "%b0",
 155                              "%a12(%7)", "%a13(%7)", "%a14", "%a15", "%a16", "%18")
 156
 157         "mov %2, %0                             \n\t"
 158         "mov %1, %k6                            \n\t"
 159         "movl %k6, (%0)                         \n\t"
 160
 161         "test $1, %4                            \n\t"
 162         " jnz 5f                                \n\t"
 163
 164         "add"OPSIZE"  $4, %2                    \n\t"
 165
 166         "4:                                     \n\t"
 167         "addl $1, %k6                           \n\t"
 168         "mov %k6, %1                            \n\t"
 169         "cmpl $63, %k6                          \n\t"
 170         " jb 3b                                 \n\t"
 171         "mov %2, %0                             \n\t"
 172         "movl %k6, (%0)                         \n\t"
 173         "5:                                     \n\t"
 174         "addl %8, %k0                           \n\t"
 175         "shr $2, %k0                            \n\t"
 176         : "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),
 177           "=&r"(bit), "+&r"(c->range), "=&r"(state)
 178         : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
 179           "m"(sig_off), "m"(last_coeff_ctx_base),
 180           "i"(offsetof(CABACContext, bytestream)),
 181           "i"(offsetof(CABACContext, bytestream_end)),
 182           "i"(H264_NORM_SHIFT_OFFSET),
 183           "i"(H264_LPS_RANGE_OFFSET),
 184           "i"(H264_MLPS_STATE_OFFSET),
 185           "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG
 186         : "%"REG_c, "memory"
 187     );
 188     return coeff_count;
 189 }
 190 #endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
 191
 192 #endif /* HAVE_INLINE_ASM */
 193 #endif /* AVCODEC_X86_H264_I386_H */