/*
* Copyright (C) 2003-2013 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 PCM_CONVERT_HXX
#define PCM_CONVERT_HXX
#include "PcmDither.hxx"
#include "PcmDsd.hxx"
#include "PcmResample.hxx"
#include "PcmBuffer.hxx"
#include "AudioFormat.hxx"
#include <stddef.h>
template<typename T> struct ConstBuffer;
class Error;
class Domain;
/**
* This object is statically allocated (within another struct), and
* holds buffer allocations and the state for all kinds of PCM
* conversions.
*/
class PcmConvert {
PcmDsd dsd;
PcmResampler resampler;
PcmDither dither;
/** the buffer for converting the sample format */
PcmBuffer format_buffer;
/** the buffer for converting the channel count */
PcmBuffer channels_buffer;
AudioFormat src_format, dest_format;
/**
* Do we get DSD source data? Then this flag is true and
* src_format.format is set to SampleFormat::FLOAT, because
* the #PcmDsd class will convert it to floating point.
*/
bool is_dsd;
public:
PcmConvert();
~PcmConvert();
/**
* Prepare the object. Call Close() when done.
*/
bool Open(AudioFormat _src_format, AudioFormat _dest_format,
Error &error);
/**
* Close the object after it was prepared with Open(). After
* that, it may be reused by calling Open() again.
*/
void Close();
/**
* Converts PCM data between two audio formats.
*
* @param src_format the source audio format
* @param src the source PCM buffer
* @param src_size the size of #src in bytes
* @param dest_format the requested destination audio format
* @param dest_size_r returns the number of bytes of the destination buffer
* @param error_r location to store the error occurring, or NULL to
* ignore errors
* @return the destination buffer, or NULL on error
*/
const void *Convert(const void *src, size_t src_size,
size_t *dest_size_r,
Error &error);
private:
ConstBuffer<int16_t> Convert16(ConstBuffer<void> src, Error &error);
ConstBuffer<int32_t> Convert24(ConstBuffer<void> src, Error &error);
ConstBuffer<int32_t> Convert32(ConstBuffer<void> src, Error &error);
ConstBuffer<float> ConvertFloat(ConstBuffer<void> src, Error &error);
};
extern const Domain pcm_convert_domain;
bool
pcm_convert_global_init(Error &error);
#endif
