/* * Copyright (C) 2003-2009 The Music Player Daemon Project * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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, uint8_t dest_channels, uint8_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, uint8_t dest_channels, uint8_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, uint8_t dest_channels, uint8_t src_channels, const int32_t *src, size_t src_size, size_t *dest_size_r); #endif