00001 /* 00002 * Copyright (C) 2003-2009 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, 00040 unsigned num_samples); 00041 00042 void 00043 pcm_dither_32_to_16(struct pcm_dither *dither, 00044 int16_t *dest, const int32_t *src, 00045 unsigned num_samples); 00046 00047 #endif