JUCE/modules/juce_audio_basics/sources/juce_ToneGeneratorAudioSource.h

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-11 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE 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 General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#ifndef __JUCE_TONEGENERATORAUDIOSOURCE_JUCEHEADER__
#define __JUCE_TONEGENERATORAUDIOSOURCE_JUCEHEADER__

#include "juce_AudioSource.h"


//==============================================================================
/**
    A simple AudioSource that generates a sine wave.

*/
class JUCE_API  ToneGeneratorAudioSource  : public AudioSource
{
public:
    //==============================================================================
    /** Creates a ToneGeneratorAudioSource. */
    ToneGeneratorAudioSource();

    /** Destructor. */
    ~ToneGeneratorAudioSource();

    //==============================================================================
    /** Sets the signal's amplitude. */
    void setAmplitude (float newAmplitude);

    /** Sets the signal's frequency. */
    void setFrequency (double newFrequencyHz);


    //==============================================================================
    /** Implementation of the AudioSource method. */
    void prepareToPlay (int samplesPerBlockExpected, double sampleRate);

    /** Implementation of the AudioSource method. */
    void releaseResources();

    /** Implementation of the AudioSource method. */
    void getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill);


private:
    //==============================================================================
    double frequency, sampleRate;
    double currentPhase, phasePerSample;
    float amplitude;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ToneGeneratorAudioSource);
};


#endif   // __JUCE_TONEGENERATORAUDIOSOURCE_JUCEHEADER__