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  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/util_altivec.h"
  27. #include "libavcodec/mpegaudiodsp.h"
  28. #include "dsputil_altivec.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 (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
  137.         return;
  138.  
  139.     s->apply_window_float = apply_window_mp3;
  140. #endif /* HAVE_ALTIVEC */
  141. }
  142.