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/*
* Copyright 2003-2021 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_HXX
#define MPD_PCM_CHANNELS_HXX
#include <cstdint>
class PcmBuffer;
template<typename T> struct ConstBuffer;
/**
* 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
* @return the destination buffer
*/
ConstBuffer<int16_t>
pcm_convert_channels_16(PcmBuffer &buffer,
unsigned dest_channels,
unsigned src_channels,
ConstBuffer<int16_t> src) noexcept;
/**
* 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
* @return the destination buffer
*/
ConstBuffer<int32_t>
pcm_convert_channels_24(PcmBuffer &buffer,
unsigned dest_channels,
unsigned src_channels,
ConstBuffer<int32_t> src) noexcept;
/**
* 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
* @return the destination buffer
*/
ConstBuffer<int32_t>
pcm_convert_channels_32(PcmBuffer &buffer,
unsigned dest_channels,
unsigned src_channels,
ConstBuffer<int32_t> src) noexcept;
/**
* Changes the number of channels in 32 bit float 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
* @return the destination buffer
*/
ConstBuffer<float>
pcm_convert_channels_float(PcmBuffer &buffer,
unsigned dest_channels,
unsigned src_channels,
ConstBuffer<float> src) noexcept;
#endif
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