MPD
pcm_dither.h
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1 /*
2  * Copyright (C) 2003-2010 The Music Player Daemon Project
3  * http://www.musicpd.org
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #ifndef MPD_PCM_DITHER_H
21 #define MPD_PCM_DITHER_H
22 
23 #include <stdint.h>
24 
25 struct pcm_dither {
26  int32_t error[3];
27  int32_t random;
28 };
29 
30 static inline void
32 {
33  dither->error[0] = dither->error[1] = dither->error[2] = 0;
34  dither->random = 0;
35 }
36 
37 void
38 pcm_dither_24_to_16(struct pcm_dither *dither,
39  int16_t *dest, const int32_t *src,
40  unsigned num_samples);
41 
42 void
43 pcm_dither_32_to_16(struct pcm_dither *dither,
44  int16_t *dest, const int32_t *src,
45  unsigned num_samples);
46 
47 #endif