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AUD_SinusReader.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_SINUSREADER
#define AUD_SINUSREADER

#include "AUD_IReader.h"
class AUD_Buffer;

/**
 * This class is used for sine tone playback.
 * The output format is in the 16 bit format and stereo, the sample rate can be
 * specified.
 * As the two channels both play the same the output could also be mono, but
 * in most cases this will result in having to resample for output, so stereo
 * sound is created directly.
 */
00040 class AUD_SinusReader : public AUD_IReader
{
private:
      /**
       * The frequency of the sine wave.
       */
00046       double m_frequency;

      /**
       * The current position in samples.
       */
00051       int m_position;

      /**
       * The playback buffer.
       */
00056       AUD_Buffer* m_buffer;

      /**
       * The sample rate for the output.
       */
00061       AUD_SampleRate m_sampleRate;

public:
      /**
       * Creates a new reader.
       * \param frequency The frequency of the sine wave.
       * \param sampleRate The output sample rate.
       */
      AUD_SinusReader(double frequency, AUD_SampleRate sampleRate);

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

      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_SINUSREADER

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