MPD 0.17~git
src/pcm_dither.h
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00001 /*
00002  * Copyright (C) 2003-2011 The Music Player Daemon Project
00003  * http://www.musicpd.org
00004  *
00005  * This program is free software; you can redistribute it and/or modify
00006  * it under the terms of the GNU General Public License as published by
00007  * the Free Software Foundation; either version 2 of the License, or
00008  * (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License along
00016  * with this program; if not, write to the Free Software Foundation, Inc.,
00017  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00018  */
00019 
00020 #ifndef MPD_PCM_DITHER_H
00021 #define MPD_PCM_DITHER_H
00022 
00023 #include <stdint.h>
00024 
00025 struct pcm_dither {
00026         int32_t error[3];
00027         int32_t random;
00028 };
00029 
00030 static inline void
00031 pcm_dither_24_init(struct pcm_dither *dither)
00032 {
00033         dither->error[0] = dither->error[1] = dither->error[2] = 0;
00034         dither->random = 0;
00035 }
00036 
00037 void
00038 pcm_dither_24_to_16(struct pcm_dither *dither,
00039                     int16_t *dest, const int32_t *src, const int32_t *src_end);
00040 
00041 void
00042 pcm_dither_32_to_16(struct pcm_dither *dither,
00043                     int16_t *dest, const int32_t *src, const int32_t *src_end);
00044 
00045 #endif