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AUD_FaderReader.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_FADERREADER
#define AUD_FADERREADER

#include "AUD_EffectReader.h"
#include "AUD_ConverterFunctions.h"
class AUD_Buffer;

/**
 * This class fades another reader.
 * If the fading type is AUD_FADE_IN, everything before the fading start will be
 * silenced, for AUD_FADE_OUT that's true for everything after fading ends.
 */
00038 class AUD_FaderReader : public AUD_EffectReader
{
private:
      /**
       * The playback buffer.
       */
00044       AUD_Buffer *m_buffer;

      /**
       * The fading type.
       */
00049       AUD_FadeType m_type;

      /**
       * The fading start.
       */
00054       float m_start;

      /**
       * The fading length.
       */
00059       float m_length;

      /**
       * Volume adjustment function.
       */
00064       AUD_volume_adjust_f m_adjust;

public:
      /**
       * Creates a new fader reader.
       * \param type The fading type.
       * \param start The time where fading should start in seconds.
       * \param length How long fading should last in seconds.
       * \exception AUD_Exception Thrown if the reader specified is NULL.
       */
      AUD_FaderReader(AUD_IReader* reader, AUD_FadeType type,
                              float start,float length);

      /**
       * Destroys the reader.
       */
      virtual ~AUD_FaderReader();

      virtual bool notify(AUD_Message &message);
      virtual void read(int & length, sample_t* & buffer);
};

#endif //AUD_FADERREADER

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