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AUD_SRCResampleReader.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_SRCRESAMPLEREADER
#define AUD_SRCRESAMPLEREADER

#include "AUD_EffectReader.h"
class AUD_Buffer;

#include <samplerate.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_SRCResampleReader : public AUD_EffectReader
{
private:
      /**
       * The resampling factor.
       */
00049       double m_factor;

      /**
       * The sound output buffer.
       */
00054       AUD_Buffer *m_buffer;

      /**
       * The target specification.
       */
00059       AUD_Specs m_tspecs;

      /**
       * The sample specification of the source.
       */
00064       AUD_Specs m_sspecs;

      /**
       * The src state structure.
       */
00069       SRC_STATE* m_src;

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_SRCResampleReader(AUD_IReader* reader, AUD_Specs specs);

      /**
       * Destroys the reader.
       */
      ~AUD_SRCResampleReader();

      /**
       * The callback function for SRC.
       * \warning Do not call!
       * \param data The pointer to the float data.
       * \return The count of samples in the float data.
       */
      long doCallback(float** data);

      virtual void seek(int position);
      virtual int getLength();
      virtual int getPosition();
      virtual AUD_Specs getSpecs();
      virtual void read(int & length, sample_t* & buffer);
};

#endif //AUD_SRCRESAMPLEREADER

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