path: root/src/pcm_dither.h

/* the Music Player Daemon (MPD)
 * Copyright (C) 2008 Max Kellermann <max@duempel.org>
 * This project's homepage is: http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef MPD_PCM_DITHER_H
#define MPD_PCM_DITHER_H

#include <stdint.h>

struct pcm_dither_24 {
	int32_t error[3];
	int32_t random;
};

static inline void
pcm_dither_24_init(struct pcm_dither_24 *dither)
{
	dither->error[0] = dither->error[1] = dither->error[2] = 0;
	dither->random = 0;
}

void
pcm_dither_24_to_16(struct pcm_dither_24 *dither,
		    int16_t *dest, const int32_t *src,
		    unsigned num_samples);

#endif