mpegaudiodsp_altivec.c 4 KB
Newer Older
1 2 3 4
/*
 * Altivec optimized MP3 decoding functions
 * Copyright (c) 2010 Vitor Sessak
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav is free software; you can redistribute it and/or
8 9 10 11
 * 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.
 *
12
 * Libav is distributed in the hope that it will be useful,
13 14 15 16 17
 * 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
18
 * License along with Libav; if not, write to the Free Software
19 20 21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

22
#include "config.h"
23
#include "libavutil/attributes.h"
24
#include "libavutil/cpu.h"
25
#include "libavutil/internal.h"
26
#include "libavutil/ppc/cpu.h"
27
#include "libavutil/ppc/util_altivec.h"
28
#include "libavcodec/mpegaudiodsp.h"
29

30
#if HAVE_ALTIVEC && HAVE_BIGENDIAN
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130

#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;
}

131 132 133
#endif /* HAVE_ALTIVEC */

av_cold void ff_mpadsp_init_ppc(MPADSPContext *s)
134
{
135
#if HAVE_ALTIVEC && HAVE_BIGENDIAN
136
    if (!PPC_ALTIVEC(av_get_cpu_flags()))
137 138
        return;

139
    s->apply_window_float = apply_window_mp3;
140
#endif /* HAVE_ALTIVEC */
141
}