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  1. /*
  2.  * Copyright (c) 2006 Luca Barbato <lu_zero@gentoo.org>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "config.h"
  22. #if HAVE_ALTIVEC_H
  23. #include <altivec.h>
  24. #endif
  25. #include "libavutil/attributes.h"
  26. #include "libavutil/cpu.h"
  27. #include "libavcodec/vorbisdsp.h"
  28.  
  29. #if HAVE_ALTIVEC
  30. static void vorbis_inverse_coupling_altivec(float *mag, float *ang,
  31.                                             intptr_t blocksize)
  32. {
  33.     int i;
  34.     vector float m, a;
  35.     vector bool int t0, t1;
  36.     const vector unsigned int v_31 = //XXX
  37.         vec_add(vec_add(vec_splat_u32(15),vec_splat_u32(15)),vec_splat_u32(1));
  38.     for (i = 0; i < blocksize; i += 4) {
  39.         m = vec_ld(0, mag+i);
  40.         a = vec_ld(0, ang+i);
  41.         t0 = vec_cmple(m, (vector float)vec_splat_u32(0));
  42.         t1 = vec_cmple(a, (vector float)vec_splat_u32(0));
  43.         a = vec_xor(a, (vector float) vec_sl((vector unsigned int)t0, v_31));
  44.         t0 = (vector bool int)vec_and(a, t1);
  45.         t1 = (vector bool int)vec_andc(a, t1);
  46.         a = vec_sub(m, (vector float)t1);
  47.         m = vec_add(m, (vector float)t0);
  48.         vec_stl(a, 0, ang+i);
  49.         vec_stl(m, 0, mag+i);
  50.     }
  51. }
  52. #endif /* HAVE_ALTIVEC */
  53.  
  54. av_cold void ff_vorbisdsp_init_ppc(VorbisDSPContext *c)
  55. {
  56. #if HAVE_ALTIVEC
  57.     if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
  58.         return;
  59.  
  60.     c->vorbis_inverse_coupling = vorbis_inverse_coupling_altivec;
  61. #endif /* HAVE_ALTIVEC */
  62. }
  63.