forked from bartvdbraak/blender
129 lines
3.0 KiB
C
129 lines
3.0 KiB
C
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/*
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* $Id$
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*
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* ***** BEGIN LGPL LICENSE BLOCK *****
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*
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* Copyright 2009 Jörg Hermann Müller
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*
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* This file is part of AudaSpace.
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*
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* AudaSpace is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* AudaSpace is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
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*
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* ***** END LGPL LICENSE BLOCK *****
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*/
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#ifndef AUD_SDLMIXERREADER
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#define AUD_SDLMIXERREADER
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#include "AUD_IReader.h"
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class AUD_Buffer;
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#include <SDL.h>
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/**
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* This class mixes a sound source with help of the SDL library.
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* Unfortunately SDL is only capable of 8 and 16 bit audio, mono and stereo, as
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* well as resampling only 2^n sample rate relationships where n is a natural
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* number.
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* \warning Although SDL can only resample 2^n sample rate relationships, this
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* class doesn't check for compliance, so in case of other factors,
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* the behaviour is undefined.
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*/
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class AUD_SDLMixerReader : public AUD_IReader
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{
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private:
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/**
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* The reader that is being mixed.
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*/
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AUD_IReader* m_reader;
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/**
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* The current reading position in the resampling buffer.
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*/
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int m_rsposition;
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/**
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* The count of mixed samples in the resampling buffer.
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*/
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int m_rssize;
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/**
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* The smallest count of source samples to get a fractionless resampling
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* factor.
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*/
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int m_ssize;
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/**
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* The smallest count of target samples to get a fractionless resampling
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* factor.
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*/
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int m_tsize;
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/**
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* The sound output buffer.
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*/
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AUD_Buffer *m_buffer;
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/**
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* The resampling buffer.
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*/
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AUD_Buffer *m_rsbuffer;
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/**
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* The target specification.
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*/
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AUD_Specs m_tspecs;
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/**
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* The sample specification of the source.
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*/
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AUD_Specs m_sspecs;
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/**
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* Saves whether the end of the source has been reached.
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*/
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bool m_eor;
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/**
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* The SDL_AudioCVT structure used for resampling.
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*/
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SDL_AudioCVT m_cvt;
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public:
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/**
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* Creates a resampling reader.
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* \param reader The reader to mix.
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* \param specs The target specification.
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* \exception AUD_Exception Thrown if the source specification cannot be
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* mixed to the target specification or if the reader is
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* NULL.
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*/
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AUD_SDLMixerReader(AUD_IReader* reader, AUD_Specs specs);
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/**
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* Destroys the reader.
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*/
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~AUD_SDLMixerReader();
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virtual bool isSeekable();
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virtual void seek(int position);
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virtual int getLength();
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virtual int getPosition();
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virtual AUD_Specs getSpecs();
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virtual AUD_ReaderType getType();
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virtual bool notify(AUD_Message &message);
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virtual void read(int & length, sample_t* & buffer);
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};
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#endif //AUD_SDLMIXERREADER
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