audiodsp.c

   1 /*
   2  * Copyright (c) 2007 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 /**
  22  * @file
  23  * miscellaneous audio operations
  24  */
  25
  26 #include "config.h"
  27 #if HAVE_ALTIVEC_H
  28 #include <altivec.h>
  29 #endif
  30
  31 #include "libavutil/attributes.h"
  32 #include "libavutil/cpu.h"
  33 #include "libavutil/ppc/cpu.h"
  34 #include "libavutil/ppc/types_altivec.h"
  35 #include "libavutil/ppc/util_altivec.h"
  36 #include "libavcodec/audiodsp.h"
  37
  38 #if HAVE_ALTIVEC
  39
  40 static int32_t scalarproduct_int16_altivec(const int16_t *v1, const int16_t *v2,
  41                                            int order)
  42 {
  43     int i;
  44     LOAD_ZERO;
  45     register vec_s16 vec1;
  46     register vec_s32 res = vec_splat_s32(0), t;
  47     int32_t ires;
  48
  49     for (i = 0; i < order; i += 8) {
  50         vec1 = vec_unaligned_load(v1);
  51         t    = vec_msum(vec1, vec_ld(0, v2), zero_s32v);
  52         res  = vec_sums(t, res);
  53         v1  += 8;
  54         v2  += 8;
  55     }
  56     res = vec_splat(res, 3);
  57     vec_ste(res, 0, &ires);
  58
  59     return ires;
  60 }
  61
  62 #endif /* HAVE_ALTIVEC */
  63
  64 av_cold void ff_audiodsp_init_ppc(AudioDSPContext *c)
  65 {
  66 #if HAVE_ALTIVEC
  67     if (!PPC_ALTIVEC(av_get_cpu_flags()))
  68         return;
  69
  70     c->scalarproduct_int16 = scalarproduct_int16_altivec;
  71 #endif /* HAVE_ALTIVEC */
  72 }