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/*

 * Altivec optimized MP3 decoding functions

 * Copyright (c) 2010 Vitor Sessak

 *

 * 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 "config.h"

#include "libavutil/attributes.h"

#include "libavutil/cpu.h"

#include "libavutil/internal.h"

#include "libavutil/ppc/util_altivec.h"

#include "libavcodec/mpegaudiodsp.h"

#include "dsputil_altivec.h"

#if HAVE_ALTIVEC

#define MACS(rt, ra, rb) rt+=(ra)*(rb)

#define MLSS(rt, ra, rb) rt-=(ra)*(rb)

#define SUM8(op, sum, w, p)               \

{                                         \

    op(sum, (w)[0 * 64], (p)[0 * 64]);    \

    op(sum, (w)[1 * 64], (p)[1 * 64]);    \

    op(sum, (w)[2 * 64], (p)[2 * 64]);    \

    op(sum, (w)[3 * 64], (p)[3 * 64]);    \

    op(sum, (w)[4 * 64], (p)[4 * 64]);    \

    op(sum, (w)[5 * 64], (p)[5 * 64]);    \

    op(sum, (w)[6 * 64], (p)[6 * 64]);    \

    op(sum, (w)[7 * 64], (p)[7 * 64]);    \

}

static void apply_window(const float *buf, const float *win1,

                         const float *win2, float *sum1, float *sum2, int len)

{

    const vector float *win1a = (const vector float *) win1;

    const vector float *win2a = (const vector float *) win2;

    const vector float *bufa  = (const vector float *) buf;

    vector float *sum1a = (vector float *) sum1;

    vector float *sum2a = (vector float *) sum2;

    vector float av_uninit(v0), av_uninit(v4);

    vector float v1, v2, v3;

    len = len >> 2;

#define MULT(a, b)                         \

    {                                      \

        v1 = vec_ld(a, win1a);             \

        v2 = vec_ld(b, win2a);             \

        v3 = vec_ld(a, bufa);              \

        v0 = vec_madd(v3, v1, v0);         \

        v4 = vec_madd(v2, v3, v4);         \

    }

    while (len--) {

        v0 = vec_xor(v0, v0);

        v4 = vec_xor(v4, v4);

        MULT(   0,   0);

        MULT( 256,  64);

        MULT( 512, 128);

        MULT( 768, 192);

        MULT(1024, 256);

        MULT(1280, 320);

        MULT(1536, 384);

        MULT(1792, 448);

        vec_st(v0, 0, sum1a);

        vec_st(v4, 0, sum2a);

        sum1a++;

        sum2a++;

        win1a++;

        win2a++;

        bufa++;

    }

}

static void apply_window_mp3(float *in, float *win, int *unused, float *out,

                             int incr)

{

    LOCAL_ALIGNED_16(float, suma, [17]);

    LOCAL_ALIGNED_16(float, sumb, [17]);

    LOCAL_ALIGNED_16(float, sumc, [17]);

    LOCAL_ALIGNED_16(float, sumd, [17]);

    float sum;

    int j;

    float *out2 = out + 32 * incr;

    /* copy to avoid wrap */

    memcpy(in + 512, in, 32 * sizeof(*in));

    apply_window(in + 16, win     , win + 512, suma, sumc, 16);

    apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16);

    SUM8(MLSS, suma[0], win + 32, in + 48);

    sumc[ 0] = 0;

    sumb[16] = 0;

    sumd[16] = 0;

    out[0  ]  = suma[   0];

    out += incr;

    out2 -= incr;

    for(j=1;j<16;j++) {

        *out  =  suma[   j] - sumd[16-j];

        *out2 = -sumb[16-j] - sumc[   j];

        out  += incr;

        out2 -= incr;

    }

    sum = 0;

    SUM8(MLSS, sum, win + 16 + 32, in + 32);

    *out = sum;

}

#endif /* HAVE_ALTIVEC */

av_cold void ff_mpadsp_init_ppc(MPADSPContext *s)

{

#if HAVE_ALTIVEC

    if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))

        return;

    s->apply_window_float = apply_window_mp3;

#endif /* HAVE_ALTIVEC */

}