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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 
ff_dither_init_x86(DitherDSPContext * ddsp,enum AVResampleDitherMethod method)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_FAST(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_FAST(cpu_flags)) {
57             ddsp->dither_int_to_float = ff_dither_int_to_float_triangular_avx;
58         }
59     }
60 }
61