source/modules/juce_audio_basics/sources/juce_ToneGeneratorAudioSource.cpp

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library.
   5    Copyright (c) 2022 - Raw Material Software Limited
   6
   7    JUCE is an open source library subject to commercial or open-source
   8    licensing.
   9
  10    The code included in this file is provided under the terms of the ISC license
  11    http://www.isc.org/downloads/software-support-policy/isc-license. Permission
  12    To use, copy, modify, and/or distribute this software for any purpose with or
  13    without fee is hereby granted provided that the above copyright notice and
  14    this permission notice appear in all copies.
  15
  16    JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
  17    EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
  18    DISCLAIMED.
  19
  20   ==============================================================================
  21 */
  22
  23 namespace juce
  24 {
  25
  26 ToneGeneratorAudioSource::ToneGeneratorAudioSource()
  27     : frequency (1000.0),
  28       sampleRate (44100.0),
  29       currentPhase (0.0),
  30       phasePerSample (0.0),
  31       amplitude (0.5f)
  32 {
  33 }
  34
  35 ToneGeneratorAudioSource::~ToneGeneratorAudioSource()
  36 {
  37 }
  38
  39 //==============================================================================
  40 void ToneGeneratorAudioSource::setAmplitude (const float newAmplitude)
  41 {
  42     amplitude = newAmplitude;
  43 }
  44
  45 void ToneGeneratorAudioSource::setFrequency (const double newFrequencyHz)
  46 {
  47     frequency = newFrequencyHz;
  48     phasePerSample = 0.0;
  49 }
  50
  51 //==============================================================================
  52 void ToneGeneratorAudioSource::prepareToPlay (int /*samplesPerBlockExpected*/, double rate)
  53 {
  54     currentPhase = 0.0;
  55     phasePerSample = 0.0;
  56     sampleRate = rate;
  57 }
  58
  59 void ToneGeneratorAudioSource::releaseResources()
  60 {
  61 }
  62
  63 void ToneGeneratorAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
  64 {
  65     if (phasePerSample == 0.0)
  66         phasePerSample = MathConstants<double>::twoPi / (sampleRate / frequency);
  67
  68     for (int i = 0; i < info.numSamples; ++i)
  69     {
  70         const float sample = amplitude * (float) std::sin (currentPhase);
  71         currentPhase += phasePerSample;
  72
  73         for (int j = info.buffer->getNumChannels(); --j >= 0;)
  74             info.buffer->setSample (j, info.startSample + i, sample);
  75     }
  76 }
  77
  78 } // namespace juce