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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_MIXER
#define AUD_MIXER
#include "AUD_ConverterFunctions.h"
#include "AUD_Buffer.h"
class AUD_IReader;
#include <list>
struct AUD_MixerBuffer
{
sample_t* buffer;
int start;
int length;
float volume;
};
/**
* This abstract class is able to mix audiosignals of different channel count
* and sample rate and convert it to a specific output format.
*/
class AUD_Mixer
{
protected:
/**
* The list of buffers to superpose.
*/
std::list<AUD_MixerBuffer> m_buffers;
/**
* The output specification.
*/
const AUD_DeviceSpecs m_specs;
/**
* The temporary mixing buffer.
*/
AUD_Buffer m_buffer;
/**
* Converter function.
*/
AUD_convert_f m_convert;
public:
/**
* Creates the mixer.
*/
AUD_Mixer(AUD_DeviceSpecs specs);
/**
* Destroys the mixer.
*/
virtual ~AUD_Mixer() {}
/**
* Returns the target specification for superposing.
* \return The target specification.
*/
AUD_DeviceSpecs getSpecs() const;
/**
* This funuction prepares a reader for playback.
* \param reader The reader to prepare.
* \return The reader that should be used for playback.
*/
virtual AUD_IReader* prepare(AUD_IReader* reader)=0;
/**
* Adds a buffer for superposition.
* \param buffer The buffer to superpose.
* \param start The start sample of the buffer.
* \param length The length of the buffer in samples.
* \param volume The mixing volume. Must be a value between 0.0 and 1.0.
*/
virtual void add(sample_t* buffer, int start, int length, float volume);
/**
* Superposes all added buffers into an output buffer.
* \param buffer The target buffer for superposing.
* \param length The length of the buffer in samples.
* \param volume The mixing volume. Must be a value between 0.0 and 1.0.
*/
virtual void superpose(data_t* buffer, int length, float volume);
};
#endif //AUD_MIXER
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