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ffmpeg / libavcodec / ppc / mpegaudiodec_altivec.c @ 2912e87a

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/*
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 * Altivec optimized MP3 decoding functions
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 * Copyright (c) 2010 Vitor Sessak
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "dsputil_altivec.h"
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#include "util_altivec.h"
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#define CONFIG_FLOAT 1
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#include "libavcodec/mpegaudio.h"
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#define MACS(rt, ra, rb) rt+=(ra)*(rb)
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#define MLSS(rt, ra, rb) rt-=(ra)*(rb)
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#define SUM8(op, sum, w, p)               \
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{                                         \
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    op(sum, (w)[0 * 64], (p)[0 * 64]);    \
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    op(sum, (w)[1 * 64], (p)[1 * 64]);    \
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    op(sum, (w)[2 * 64], (p)[2 * 64]);    \
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    op(sum, (w)[3 * 64], (p)[3 * 64]);    \
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    op(sum, (w)[4 * 64], (p)[4 * 64]);    \
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    op(sum, (w)[5 * 64], (p)[5 * 64]);    \
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    op(sum, (w)[6 * 64], (p)[6 * 64]);    \
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    op(sum, (w)[7 * 64], (p)[7 * 64]);    \
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}
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static void apply_window(const float *buf, const float *win1,
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                         const float *win2, float *sum1, float *sum2, int len)
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{
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    const vector float *win1a = (const vector float *) win1;
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    const vector float *win2a = (const vector float *) win2;
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    const vector float *bufa  = (const vector float *) buf;
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    vector float *sum1a = (vector float *) sum1;
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    vector float *sum2a = (vector float *) sum2;
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    vector float av_uninit(v0), av_uninit(v4);
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    vector float v1, v2, v3;
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    len = len >> 2;
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#define MULT(a, b)                         \
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    {                                      \
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        v1 = vec_ld(a, win1a);             \
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        v2 = vec_ld(b, win2a);             \
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        v3 = vec_ld(a, bufa);              \
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        v0 = vec_madd(v3, v1, v0);         \
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        v4 = vec_madd(v2, v3, v4);         \
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    }
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    while (len--) {
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        v0 = vec_xor(v0, v0);
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        v4 = vec_xor(v4, v4);
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        MULT(   0,   0);
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        MULT( 256,  64);
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        MULT( 512, 128);
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        MULT( 768, 192);
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        MULT(1024, 256);
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        MULT(1280, 320);
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        MULT(1536, 384);
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        MULT(1792, 448);
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        vec_st(v0, 0, sum1a);
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        vec_st(v4, 0, sum2a);
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        sum1a++;
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        sum2a++;
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        win1a++;
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        win2a++;
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        bufa++;
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    }
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}
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static void apply_window_mp3(float *in, float *win, int *unused, float *out,
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                             int incr)
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{
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    LOCAL_ALIGNED_16(float, suma, [17]);
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    LOCAL_ALIGNED_16(float, sumb, [17]);
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    LOCAL_ALIGNED_16(float, sumc, [17]);
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    LOCAL_ALIGNED_16(float, sumd, [17]);
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    float sum;
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    int j;
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    float *out2 = out + 32 * incr;
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    /* copy to avoid wrap */
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    memcpy(in + 512, in, 32 * sizeof(*in));
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    apply_window(in + 16, win     , win + 512, suma, sumc, 16);
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    apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16);
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    SUM8(MLSS, suma[0], win + 32, in + 48);
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    sumc[ 0] = 0;
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    sumb[16] = 0;
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    sumd[16] = 0;
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    out[0  ]  = suma[   0];
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    out += incr;
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    out2 -= incr;
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    for(j=1;j<16;j++) {
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        *out  =  suma[   j] - sumd[16-j];
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        *out2 = -sumb[16-j] - sumc[   j];
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        out  += incr;
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        out2 -= incr;
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    }
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    sum = 0;
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    SUM8(MLSS, sum, win + 16 + 32, in + 32);
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    *out = sum;
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}
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void ff_mpegaudiodec_init_altivec(MPADecodeContext *s)
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{
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    s->apply_window_mp3 = apply_window_mp3;
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}