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Diffstat (limited to 'intern/audaspace/SDL/AUD_SDLMixerReader.h')
-rw-r--r-- | intern/audaspace/SDL/AUD_SDLMixerReader.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/intern/audaspace/SDL/AUD_SDLMixerReader.h b/intern/audaspace/SDL/AUD_SDLMixerReader.h new file mode 100644 index 00000000000..56668d02171 --- /dev/null +++ b/intern/audaspace/SDL/AUD_SDLMixerReader.h @@ -0,0 +1,128 @@ +/* + * $Id$ + * + * ***** 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 |