juce/source/src/audio/audio_sources/juce_ToneGeneratorAudioSource.h

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library - "Jules' Utility Class Extensions"
   5    Copyright 2004-11 by Raw Material Software Ltd.
   6
   7   ------------------------------------------------------------------------------
   8
   9    JUCE can be redistributed and/or modified under the terms of the GNU General
  10    Public License (Version 2), as published by the Free Software Foundation.
  11    A copy of the license is included in the JUCE distribution, or can be found
  12    online at www.gnu.org/licenses.
  13
  14    JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
  15    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  16    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  17
  18   ------------------------------------------------------------------------------
  19
  20    To release a closed-source product which uses JUCE, commercial licenses are
  21    available: visit www.rawmaterialsoftware.com/juce for more information.
  22
  23   ==============================================================================
  24 */
  25
  26 #ifndef __JUCE_TONEGENERATORAUDIOSOURCE_JUCEHEADER__
  27 #define __JUCE_TONEGENERATORAUDIOSOURCE_JUCEHEADER__
  28
  29 #include "juce_AudioSource.h"
  30
  31
  32 //==============================================================================
  33 /**
  34     A simple AudioSource that generates a sine wave.
  35
  36 */
  37 class JUCE_API  ToneGeneratorAudioSource  : public AudioSource
  38 {
  39 public:
  40     //==============================================================================
  41     /** Creates a ToneGeneratorAudioSource. */
  42     ToneGeneratorAudioSource();
  43
  44     /** Destructor. */
  45     ~ToneGeneratorAudioSource();
  46
  47     //==============================================================================
  48     /** Sets the signal's amplitude. */
  49     void setAmplitude (float newAmplitude);
  50
  51     /** Sets the signal's frequency. */
  52     void setFrequency (double newFrequencyHz);
  53
  54
  55     //==============================================================================
  56     /** Implementation of the AudioSource method. */
  57     void prepareToPlay (int samplesPerBlockExpected, double sampleRate);
  58
  59     /** Implementation of the AudioSource method. */
  60     void releaseResources();
  61
  62     /** Implementation of the AudioSource method. */
  63     void getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill);
  64
  65
  66 private:
  67     //==============================================================================
  68     double frequency, sampleRate;
  69     double currentPhase, phasePerSample;
  70     float amplitude;
  71
  72     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ToneGeneratorAudioSource);
  73 };
  74
  75
  76 #endif   // __JUCE_TONEGENERATORAUDIOSOURCE_JUCEHEADER__