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  1. /*
  2.  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
  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/cpu.h"
  23. #include "libavutil/x86/cpu.h"
  24. #include "libavresample/dither.h"
  25.  
  26. void ff_quantize_sse2(int16_t *dst, const float *src, float *dither, int len);
  27.  
  28. void ff_dither_int_to_float_rectangular_sse2(float *dst, int *src, int len);
  29. void ff_dither_int_to_float_rectangular_avx(float *dst, int *src, int len);
  30.  
  31. void ff_dither_int_to_float_triangular_sse2(float *dst, int *src0, int len);
  32. void ff_dither_int_to_float_triangular_avx(float *dst, int *src0, int len);
  33.  
  34. av_cold void ff_dither_init_x86(DitherDSPContext *ddsp,
  35.                                 enum AVResampleDitherMethod method)
  36. {
  37.     int cpu_flags = av_get_cpu_flags();
  38.  
  39.     if (EXTERNAL_SSE2(cpu_flags)) {
  40.         ddsp->quantize      = ff_quantize_sse2;
  41.         ddsp->ptr_align     = 16;
  42.         ddsp->samples_align = 8;
  43.     }
  44.  
  45.     if (method == AV_RESAMPLE_DITHER_RECTANGULAR) {
  46.         if (EXTERNAL_SSE2(cpu_flags)) {
  47.             ddsp->dither_int_to_float = ff_dither_int_to_float_rectangular_sse2;
  48.         }
  49.         if (EXTERNAL_AVX(cpu_flags)) {
  50.             ddsp->dither_int_to_float = ff_dither_int_to_float_rectangular_avx;
  51.         }
  52.     } else {
  53.         if (EXTERNAL_SSE2(cpu_flags)) {
  54.             ddsp->dither_int_to_float = ff_dither_int_to_float_triangular_sse2;
  55.         }
  56.         if (EXTERNAL_AVX(cpu_flags)) {
  57.             ddsp->dither_int_to_float = ff_dither_int_to_float_triangular_avx;
  58.         }
  59.     }
  60. }
  61.