/*

 * TAK decoder

 * Copyright (c) 2015 Paul B Mahol

 *

 * 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/attributes.h"

#include "takdsp.h"

#include "config.h"

static void decorrelate_ls(const int32_t *p1, int32_t *p2, int length)

{

    int i;

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

        uint32_t a = p1[i];

        uint32_t b = p2[i];

        p2[i]     = a + b;

    }

}

static void decorrelate_sr(int32_t *p1, const int32_t *p2, int length)

{

    int i;

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

        uint32_t a = p1[i];

        uint32_t b = p2[i];

        p1[i]     = b - a;

    }

}

static void decorrelate_sm(int32_t *p1, int32_t *p2, int length)

{

    int i;

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

        uint32_t a = p1[i];

        int32_t b = p2[i];

        a        -= b >> 1;

        p1[i]     = a;

        p2[i]     = a + b;

    }

}

static void decorrelate_sf(int32_t *p1, const int32_t *p2, int length, int dshift, int dfactor)

{

    int i;

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

        uint32_t a = p1[i];

        int32_t b = p2[i];

        b         = (unsigned)((int)(dfactor * (unsigned)(b >> dshift) + 128) >> 8) << dshift;

        p1[i]     = b - a;

    }

}

av_cold void ff_takdsp_init(TAKDSPContext *c)

{

    c->decorrelate_ls = decorrelate_ls;

    c->decorrelate_sr = decorrelate_sr;

    c->decorrelate_sm = decorrelate_sm;

    c->decorrelate_sf = decorrelate_sf;

#if ARCH_RISCV

    ff_takdsp_init_riscv(c);

#elif ARCH_X86 && HAVE_X86ASM

    ff_takdsp_init_x86(c);

#endif

}