/* 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_CHANNELS_H
#define MPD_PCM_CHANNELS_H
#include <stdint.h>
#include <stddef.h>
struct pcm_buffer;
/**
* Changes the number of channels in 16 bit PCM data.
*
* @param buffer the destination pcm_buffer object
* @param dest_channels the number of channels requested
* @param src_channels the number of channels in the source buffer
* @param src the source PCM buffer
* @param src_size the number of bytes in #src
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const int16_t *
pcm_convert_channels_16(struct pcm_buffer *buffer,
int8_t dest_channels,
int8_t src_channels, const int16_t *src,
size_t src_size, size_t *dest_size_r);
/**
* Changes the number of channels in 24 bit PCM data (aligned at 32
* bit boundaries).
*
* @param buffer the destination pcm_buffer object
* @param dest_channels the number of channels requested
* @param src_channels the number of channels in the source buffer
* @param src the source PCM buffer
* @param src_size the number of bytes in #src
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const int32_t *
pcm_convert_channels_24(struct pcm_buffer *buffer,
int8_t dest_channels,
int8_t src_channels, const int32_t *src,
size_t src_size, size_t *dest_size_r);
/**
* Changes the number of channels in 32 bit PCM data.
*
* @param buffer the destination pcm_buffer object
* @param dest_channels the number of channels requested
* @param src_channels the number of channels in the source buffer
* @param src the source PCM buffer
* @param src_size the number of bytes in #src
* @param dest_size_r returns the number of bytes of the destination buffer
* @return the destination buffer
*/
const int32_t *
pcm_convert_channels_32(struct pcm_buffer *buffer,
int8_t dest_channels,
int8_t src_channels, const int32_t *src,
size_t src_size, size_t *dest_size_r);
#endif
