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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. #include "libavutil/attributes.h"
  23. #include "libavutil/cpu.h"
  24. #include "libavutil/mem.h"
  25. #include "libavutil/ppc/cpu.h"
  26. #include "libavutil/ppc/util_altivec.h"
  27. #include "libavcodec/fmtconvert.h"
  28.  
  29. #if HAVE_ALTIVEC
  30.  
  31. static void int32_to_float_fmul_scalar_altivec(float *dst, const int32_t *src,
  32.                                                float mul, int len)
  33. {
  34.     union {
  35.         vector float v;
  36.         float s[4];
  37.     } mul_u;
  38.     int i;
  39.     vector float src1, src2, dst1, dst2, mul_v, zero;
  40.  
  41.     zero = (vector float)vec_splat_u32(0);
  42.     mul_u.s[0] = mul;
  43.     mul_v = vec_splat(mul_u.v, 0);
  44.  
  45.     for (i = 0; i < len; i += 8) {
  46.         src1 = vec_ctf(vec_ld(0,  src+i), 0);
  47.         src2 = vec_ctf(vec_ld(16, src+i), 0);
  48.         dst1 = vec_madd(src1, mul_v, zero);
  49.         dst2 = vec_madd(src2, mul_v, zero);
  50.         vec_st(dst1,  0, dst+i);
  51.         vec_st(dst2, 16, dst+i);
  52.     }
  53. }
  54.  
  55. #endif /* HAVE_ALTIVEC */
  56.  
  57. av_cold void ff_fmt_convert_init_ppc(FmtConvertContext *c,
  58.                                      AVCodecContext *avctx)
  59. {
  60. #if HAVE_ALTIVEC
  61.     if (!PPC_ALTIVEC(av_get_cpu_flags()))
  62.         return;
  63.  
  64.     c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_altivec;
  65. #endif /* HAVE_ALTIVEC */
  66. }
  67.