vorbisdsp_altivec.c

   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 "libavutil/ppc/cpu.h"
  28 #include "libavcodec/vorbisdsp.h"
  29
  30 #if HAVE_ALTIVEC
  31 static void vorbis_inverse_coupling_altivec(float *mag, float *ang,
  32                                             intptr_t blocksize)
  33 {
  34     int i;
  35     vector float m, a;
  36     vector bool int t0, t1;
  37     const vector unsigned int v_31 = //XXX
  38         vec_add(vec_add(vec_splat_u32(15),vec_splat_u32(15)),vec_splat_u32(1));
  39     for (i = 0; i < blocksize; i += 4) {
  40         m = vec_ld(0, mag+i);
  41         a = vec_ld(0, ang+i);
  42         t0 = vec_cmple(m, (vector float)vec_splat_u32(0));
  43         t1 = vec_cmple(a, (vector float)vec_splat_u32(0));
  44         a = vec_xor(a, (vector float) vec_sl((vector unsigned int)t0, v_31));
  45         t0 = (vector bool int)vec_and(a, t1);
  46         t1 = (vector bool int)vec_andc(a, t1);
  47         a = vec_sub(m, (vector float)t1);
  48         m = vec_add(m, (vector float)t0);
  49         vec_stl(a, 0, ang+i);
  50         vec_stl(m, 0, mag+i);
  51     }
  52 }
  53 #endif /* HAVE_ALTIVEC */
  54
  55 av_cold void ff_vorbisdsp_init_ppc(VorbisDSPContext *c)
  56 {
  57 #if HAVE_ALTIVEC
  58     if (!PPC_ALTIVEC(av_get_cpu_flags()))
  59         return;
  60
  61     c->vorbis_inverse_coupling = vorbis_inverse_coupling_altivec;
  62 #endif /* HAVE_ALTIVEC */
  63 }