mpegaudiodsp_altivec.c

   1 /*
   2  * Altivec optimized MP3 decoding functions
   3  * Copyright (c) 2010 Vitor Sessak
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  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
  31
  32 #define MACS(rt, ra, rb) rt+=(ra)*(rb)
  33 #define MLSS(rt, ra, rb) rt-=(ra)*(rb)
  34
  35 #define SUM8(op, sum, w, p)               \
  36 {                                         \
  37     op(sum, (w)[0 * 64], (p)[0 * 64]);    \
  38     op(sum, (w)[1 * 64], (p)[1 * 64]);    \
  39     op(sum, (w)[2 * 64], (p)[2 * 64]);    \
  40     op(sum, (w)[3 * 64], (p)[3 * 64]);    \
  41     op(sum, (w)[4 * 64], (p)[4 * 64]);    \
  42     op(sum, (w)[5 * 64], (p)[5 * 64]);    \
  43     op(sum, (w)[6 * 64], (p)[6 * 64]);    \
  44     op(sum, (w)[7 * 64], (p)[7 * 64]);    \
  45 }
  46
  47 static void apply_window(const float *buf, const float *win1,
  48                          const float *win2, float *sum1, float *sum2, int len)
  49 {
  50     const vector float *win1a = (const vector float *) win1;
  51     const vector float *win2a = (const vector float *) win2;
  52     const vector float *bufa  = (const vector float *) buf;
  53     vector float *sum1a = (vector float *) sum1;
  54     vector float *sum2a = (vector float *) sum2;
  55     vector float av_uninit(v0), av_uninit(v4);
  56     vector float v1, v2, v3;
  57
  58     len = len >> 2;
  59
  60 #define MULT(a, b)                         \
  61     {                                      \
  62         v1 = vec_ld(a, win1a);             \
  63         v2 = vec_ld(b, win2a);             \
  64         v3 = vec_ld(a, bufa);              \
  65         v0 = vec_madd(v3, v1, v0);         \
  66         v4 = vec_madd(v2, v3, v4);         \
  67     }
  68
  69     while (len--) {
  70         v0 = vec_xor(v0, v0);
  71         v4 = vec_xor(v4, v4);
  72
  73         MULT(   0,   0);
  74         MULT( 256,  64);
  75         MULT( 512, 128);
  76         MULT( 768, 192);
  77         MULT(1024, 256);
  78         MULT(1280, 320);
  79         MULT(1536, 384);
  80         MULT(1792, 448);
  81
  82         vec_st(v0, 0, sum1a);
  83         vec_st(v4, 0, sum2a);
  84         sum1a++;
  85         sum2a++;
  86         win1a++;
  87         win2a++;
  88         bufa++;
  89     }
  90 }
  91
  92 static void apply_window_mp3(float *in, float *win, int *unused, float *out,
  93                              int incr)
  94 {
  95     LOCAL_ALIGNED_16(float, suma, [17]);
  96     LOCAL_ALIGNED_16(float, sumb, [17]);
  97     LOCAL_ALIGNED_16(float, sumc, [17]);
  98     LOCAL_ALIGNED_16(float, sumd, [17]);
  99
 100     float sum;
 101     int j;
 102     float *out2 = out + 32 * incr;
 103
 104     /* copy to avoid wrap */
 105     memcpy(in + 512, in, 32 * sizeof(*in));
 106
 107     apply_window(in + 16, win     , win + 512, suma, sumc, 16);
 108     apply_window(in + 32, win + 48, win + 640, sumb, sumd, 16);
 109
 110     SUM8(MLSS, suma[0], win + 32, in + 48);
 111
 112     sumc[ 0] = 0;
 113     sumb[16] = 0;
 114     sumd[16] = 0;
 115
 116     out[0  ]  = suma[   0];
 117     out += incr;
 118     out2 -= incr;
 119     for(j=1;j<16;j++) {
 120         *out  =  suma[   j] - sumd[16-j];
 121         *out2 = -sumb[16-j] - sumc[   j];
 122         out  += incr;
 123         out2 -= incr;
 124     }
 125
 126     sum = 0;
 127     SUM8(MLSS, sum, win + 16 + 32, in + 32);
 128     *out = sum;
 129 }
 130
 131 #endif /* HAVE_ALTIVEC */
 132
 133 av_cold void ff_mpadsp_init_ppc(MPADSPContext *s)
 134 {
 135 #if HAVE_ALTIVEC
 136     if (!PPC_ALTIVEC(av_get_cpu_flags()))
 137         return;
 138
 139     s->apply_window_float = apply_window_mp3;
 140 #endif /* HAVE_ALTIVEC */
 141 }