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/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* AudaSpace is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AudaSpace 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#ifndef AUD_SDLMIXERREADER
#define AUD_SDLMIXERREADER
#include "AUD_IReader.h"
class AUD_Buffer;
#include <SDL.h>
/**
* This class mixes a sound source with help of the SDL library.
* Unfortunately SDL is only capable of 8 and 16 bit audio, mono and stereo, as
* well as resampling only 2^n sample rate relationships where n is a natural
* number.
* \warning Although SDL can only resample 2^n sample rate relationships, this
* class doesn't check for compliance, so in case of other factors,
* the behaviour is undefined.
*/
class AUD_SDLMixerReader : public AUD_IReader
{
private:
/**
* The reader that is being mixed.
*/
AUD_IReader* m_reader;
/**
* The current reading position in the resampling buffer.
*/
int m_rsposition;
/**
* The count of mixed samples in the resampling buffer.
*/
int m_rssize;
/**
* The smallest count of source samples to get a fractionless resampling
* factor.
*/
int m_ssize;
/**
* The smallest count of target samples to get a fractionless resampling
* factor.
*/
int m_tsize;
/**
* The sound output buffer.
*/
AUD_Buffer *m_buffer;
/**
* The resampling buffer.
*/
AUD_Buffer *m_rsbuffer;
/**
* The target specification.
*/
AUD_Specs m_tspecs;
/**
* The sample specification of the source.
*/
AUD_Specs m_sspecs;
/**
* Saves whether the end of the source has been reached.
*/
bool m_eor;
/**
* The SDL_AudioCVT structure used for resampling.
*/
SDL_AudioCVT m_cvt;
public:
/**
* Creates a resampling reader.
* \param reader The reader to mix.
* \param specs The target specification.
* \exception AUD_Exception Thrown if the source specification cannot be
* mixed to the target specification or if the reader is
* NULL.
*/
AUD_SDLMixerReader(AUD_IReader* reader, AUD_Specs specs);
/**
* Destroys the reader.
*/
~AUD_SDLMixerReader();
virtual bool isSeekable();
virtual void seek(int position);
virtual int getLength();
virtual int getPosition();
virtual AUD_Specs getSpecs();
virtual AUD_ReaderType getType();
virtual bool notify(AUD_Message &message);
virtual void read(int & length, sample_t* & buffer);
};
#endif //AUD_SDLMIXERREADER
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