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AUD_SDLMixerReader.h

/*
 * $Id$
 *
 * ***** 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.
 */
00043 class AUD_SDLMixerReader : public AUD_IReader
{
private:
      /**
       * The reader that is being mixed.
       */
00049       AUD_IReader* m_reader;

      /**
       * The current reading position in the resampling buffer.
       */
00054       int m_rsposition;

      /**
       * The count of mixed samples in the resampling buffer.
       */
00059       int m_rssize;

      /**
       * The smallest count of source samples to get a fractionless resampling
       * factor.
       */
00065       int m_ssize;

      /**
       * The smallest count of target samples to get a fractionless resampling
       * factor.
       */
00071       int m_tsize;

      /**
       * The sound output buffer.
       */
00076       AUD_Buffer *m_buffer;

      /**
       * The resampling buffer.
       */
00081       AUD_Buffer *m_rsbuffer;

      /**
       * The target specification.
       */
00086       AUD_Specs m_tspecs;

      /**
       * The sample specification of the source.
       */
00091       AUD_Specs m_sspecs;

      /**
       * Saves whether the end of the source has been reached.
       */
00096       bool m_eor;

      /**
       * The SDL_AudioCVT structure used for resampling.
       */
00101       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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