PeerStreamer

OBJS-$(CONFIG_AC3_ENCODER)             += ac3enc_float.o ac3tab.o ac3.o \

                                          ac3dsp.o

OBJS-$(CONFIG_AC3_FIXED_ENCODER)       += ac3enc_fixed.o ac3tab.o ac3.o \

                                          ac3dsp.o

/*

 * AC-3 DSP utils

 * Copyright (c) 2011 Justin Ruggles

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

 */

#include "avcodec.h"

#include "ac3dsp.h"

static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)

{

    int blk, i;

    if (!num_reuse_blocks)

        return;

    for (i = 0; i < nb_coefs; i++) {

        uint8_t min_exp = *exp;

        uint8_t *exp1 = exp + 256;

        for (blk = 0; blk < num_reuse_blocks; blk++) {

            uint8_t next_exp = *exp1;

            if (next_exp < min_exp)

                min_exp = next_exp;

            exp1 += 256;

        }

        *exp++ = min_exp;

    }

}

av_cold void ff_ac3dsp_init(AC3DSPContext *c)

{

    c->ac3_exponent_min = ac3_exponent_min_c;

    if (HAVE_MMX)

        ff_ac3dsp_init_x86(c);

}

/*

 * AC-3 DSP utils

 * Copyright (c) 2011 Justin Ruggles

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

 */

#ifndef AVCODEC_AC3DSP_H

#define AVCODEC_AC3DSP_H

#include <stdint.h>

typedef struct AC3DSPContext {

    /**

     * Set each encoded exponent in a block to the minimum of itself and the

     * exponents in the same frequency bin of up to 5 following blocks.

     * @param exp   pointer to the start of the current block of exponents.

     *              constraints: align 16

     * @param num_reuse_blocks  number of blocks that will reuse exponents from the current block.

     *                          constraints: range 0 to 5

     * @param nb_coefs  number of frequency coefficients.

     */

    void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs);

} AC3DSPContext;

void ff_ac3dsp_init    (AC3DSPContext *c);

void ff_ac3dsp_init_x86(AC3DSPContext *c);

#endif /* AVCODEC_AC3DSP_H */

#include "ac3dsp.h"

    AC3DSPContext ac3dsp;                   ///< AC-3 optimized functions

            s->ac3dsp.ac3_exponent_min(exp, num_reuse_blocks, nb_coefs);

    emms_c();

    ff_ac3dsp_init(&s->ac3dsp);

MMX-OBJS-$(CONFIG_AC3_ENCODER)         += x86/ac3dsp_mmx.o

MMX-OBJS-$(CONFIG_AC3_FIXED_ENCODER)   += x86/ac3dsp_mmx.o

YASM-OBJS-$(CONFIG_AC3_ENCODER)        += x86/ac3dsp.o

YASM-OBJS-$(CONFIG_AC3_FIXED_ENCODER)  += x86/ac3dsp.o

;*****************************************************************************

;* x86-optimized AC-3 DSP utils

;* Copyright (c) 2011 Justin Ruggles

;*

;* This file is part of FFmpeg.

;*

;* FFmpeg 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.

;*

;* FFmpeg 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 FFmpeg; if not, write to the Free Software

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

;******************************************************************************

%include "x86inc.asm"

%include "x86util.asm"

SECTION .text

;-----------------------------------------------------------------------------

; void ff_ac3_exponent_min(uint8_t *exp, int num_reuse_blocks, int nb_coefs)

;-----------------------------------------------------------------------------

%macro AC3_EXPONENT_MIN 1

cglobal ac3_exponent_min_%1, 3,4,2, exp, reuse_blks, expn, offset

    shl  reuse_blksq, 8

    jz .end

    LOOP_ALIGN

.nextexp:

    mov      offsetq, reuse_blksq

    mova          m0, [expq+offsetq]

    sub      offsetq, 256

    LOOP_ALIGN

.nextblk:

    PMINUB        m0, [expq+offsetq], m1

    sub      offsetq, 256

    jae .nextblk

    mova      [expq], m0

    add         expq, mmsize

    sub        expnq, mmsize

    jg .nextexp

.end:

    REP_RET

%endmacro

%define PMINUB PMINUB_MMX

%define LOOP_ALIGN

INIT_MMX

AC3_EXPONENT_MIN mmx

%ifdef HAVE_MMX2

%define PMINUB PMINUB_MMXEXT

%define LOOP_ALIGN ALIGN 16

AC3_EXPONENT_MIN mmxext

%endif

%ifdef HAVE_SSE

INIT_XMM

AC3_EXPONENT_MIN sse2

%endif

%undef PMINUB

%undef LOOP_ALIGN

/*

 * x86-optimized AC-3 DSP utils

 * Copyright (c) 2011 Justin Ruggles

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg 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.

 *

 * FFmpeg 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 FFmpeg; if not, write to the Free Software

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

 */

#include "libavutil/x86_cpu.h"

#include "dsputil_mmx.h"

#include "libavcodec/ac3dsp.h"

extern void ff_ac3_exponent_min_mmx   (uint8_t *exp, int num_reuse_blocks, int nb_coefs);

extern void ff_ac3_exponent_min_mmxext(uint8_t *exp, int num_reuse_blocks, int nb_coefs);

extern void ff_ac3_exponent_min_sse2  (uint8_t *exp, int num_reuse_blocks, int nb_coefs);

av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c)

{

    int mm_flags = av_get_cpu_flags();

#if HAVE_YASM

    if (mm_flags & AV_CPU_FLAG_MMX) {

        c->ac3_exponent_min = ff_ac3_exponent_min_mmx;

    }

    if (mm_flags & AV_CPU_FLAG_MMX2 && HAVE_MMX2) {

        c->ac3_exponent_min = ff_ac3_exponent_min_mmxext;

    }

    if (mm_flags & AV_CPU_FLAG_SSE2 && HAVE_SSE) {

        c->ac3_exponent_min = ff_ac3_exponent_min_sse2;

    }

#endif

}

%macro PMINUB_MMX 3 ; dst, src, tmp

    mova     %3, %1

    psubusb  %3, %2

    psubb    %1, %3

%endmacro

%macro PMINUB_MMXEXT 3 ; dst, src, ignored

    pminub   %1, %2

%endmacro