~ubuntu-branches/debian/experimental/libav/experimental

/*

 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder

 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of Libav.

 *

 * Libav is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * Libav is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * H.264 / AVC / MPEG4 part10 codec.

 * non-MMX i386-specific optimizations for H.264

 * @author Michael Niedermayer <michaelni@gmx.at>

 */

#ifndef AVCODEC_X86_H264_I386_H

#define AVCODEC_X86_H264_I386_H

#include <stddef.h>

#include "libavcodec/cabac.h"

#include "cabac.h"

#if HAVE_INLINE_ASM

//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet

//as that would make optimization work hard)

#if HAVE_7REGS

#define decode_significance decode_significance_x86

static int decode_significance_x86(CABACContext *c, int max_coeff,

                                   uint8_t *significant_coeff_ctx_base,

                                   int *index, x86_reg last_off){

    void *end= significant_coeff_ctx_base + max_coeff - 1;

    int minusstart= -(intptr_t)significant_coeff_ctx_base;

    int minusindex= 4-(intptr_t)index;

    int bit;

    x86_reg coeff_count;

#ifdef BROKEN_RELOCATIONS

    void *tables;

    __asm__ volatile(

        "lea   "MANGLE(ff_h264_cabac_tables)", %0      \n\t"

        : "=&r"(tables)

    );

#endif

    __asm__ volatile(

        "3:                                     \n\t"

        BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",

                             "%5", "%q5", "%k0", "%b0",

                             "%c11(%6)", "%c12(%6)",

                             AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),

                             AV_STRINGIFY(H264_LPS_RANGE_OFFSET),

                             AV_STRINGIFY(H264_MLPS_STATE_OFFSET),

                             "%13")

        "test $1, %4                            \n\t"

        " jz 4f                                 \n\t"

        "add  %10, %1                           \n\t"

        BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",

                             "%5", "%q5", "%k0", "%b0",

                             "%c11(%6)", "%c12(%6)",

                             AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),

                             AV_STRINGIFY(H264_LPS_RANGE_OFFSET),

                             AV_STRINGIFY(H264_MLPS_STATE_OFFSET),

                             "%13")

        "sub  %10, %1                           \n\t"

        "mov  %2, %0                            \n\t"

        "movl %7, %%ecx                         \n\t"

        "add  %1, %%"REG_c"                     \n\t"

        "movl %%ecx, (%0)                       \n\t"

        "test $1, %4                            \n\t"

        " jnz 5f                                \n\t"

        "add"OPSIZE"  $4, %2                    \n\t"

        "4:                                     \n\t"

        "add  $1, %1                            \n\t"

        "cmp  %8, %1                            \n\t"

        " jb 3b                                 \n\t"

        "mov  %2, %0                            \n\t"

        "movl %7, %%ecx                         \n\t"

        "add  %1, %%"REG_c"                     \n\t"

        "movl %%ecx, (%0)                       \n\t"

        "5:                                     \n\t"

        "add  %9, %k0                           \n\t"

        "shr $2, %k0                            \n\t"

        : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),

          "+&r"(c->low), "=&r"(bit), "+&r"(c->range)

        : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),

          "i"(offsetof(CABACContext, bytestream)),

          "i"(offsetof(CABACContext, bytestream_end))

          TABLES_ARG

        : "%"REG_c, "memory"

    );

    return coeff_count;

}

#define decode_significance_8x8 decode_significance_8x8_x86

static int decode_significance_8x8_x86(CABACContext *c,

                                       uint8_t *significant_coeff_ctx_base,

                                       int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){

    int minusindex= 4-(intptr_t)index;

    int bit;

    x86_reg coeff_count;

    x86_reg last=0;

    x86_reg state;

#ifdef BROKEN_RELOCATIONS

    void *tables;

    __asm__ volatile(

        "lea    "MANGLE(ff_h264_cabac_tables)", %0      \n\t"

        : "=&r"(tables)

    );

#endif

    __asm__ volatile(

        "mov %1, %6                             \n\t"

        "3:                                     \n\t"

        "mov %10, %0                            \n\t"

        "movzbl (%0, %6), %k6                   \n\t"

        "add %9, %6                             \n\t"

        BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",

                             "%5", "%q5", "%k0", "%b0",

                             "%c12(%7)", "%c13(%7)",

                             AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),

                             AV_STRINGIFY(H264_LPS_RANGE_OFFSET),

                             AV_STRINGIFY(H264_MLPS_STATE_OFFSET),

                             "%15")

        "mov %1, %k6                            \n\t"

        "test $1, %4                            \n\t"

        " jz 4f                                 \n\t"

#ifdef BROKEN_RELOCATIONS

        "movzbl %c14(%15, %q6), %k6\n\t"

#else

        "movzbl "MANGLE(ff_h264_cabac_tables)"+%c14(%k6), %k6\n\t"

#endif

        "add %11, %6                            \n\t"

        BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",

                             "%5", "%q5", "%k0", "%b0",

                             "%c12(%7)", "%c13(%7)",

                             AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),

                             AV_STRINGIFY(H264_LPS_RANGE_OFFSET),

                             AV_STRINGIFY(H264_MLPS_STATE_OFFSET),

                             "%15")

        "mov %2, %0                             \n\t"

        "mov %1, %k6                            \n\t"

        "movl %k6, (%0)                         \n\t"

        "test $1, %4                            \n\t"

        " jnz 5f                                \n\t"

        "add"OPSIZE"  $4, %2                    \n\t"

        "4:                                     \n\t"

        "addl $1, %k6                           \n\t"

        "mov %k6, %1                            \n\t"

        "cmpl $63, %k6                          \n\t"

        " jb 3b                                 \n\t"

        "mov %2, %0                             \n\t"

        "movl %k6, (%0)                         \n\t"

        "5:                                     \n\t"

        "addl %8, %k0                           \n\t"

        "shr $2, %k0                            \n\t"

        : "=&q"(coeff_count), "+m"(last), "+m"(index), "+&r"(c->low),

          "=&r"(bit), "+&r"(c->range), "=&r"(state)

        : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),

          "m"(sig_off), "m"(last_coeff_ctx_base),

          "i"(offsetof(CABACContext, bytestream)),

          "i"(offsetof(CABACContext, bytestream_end)),

          "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG

        : "%"REG_c, "memory"

    );

    return coeff_count;

}

#endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */

#endif /* HAVE_INLINE_ASM */

#endif /* AVCODEC_X86_H264_I386_H */