OpenShot Library | OpenShotAudio  0.2.2
juce_ToneGeneratorAudioSource.cpp
1 /*
2  ==============================================================================
3 
4  This file is part of the JUCE library.
5  Copyright (c) 2017 - ROLI Ltd.
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 
27  : frequency (1000.0),
28  sampleRate (44100.0),
29  currentPhase (0.0),
30  phasePerSample (0.0),
31  amplitude (0.5f)
32 {
33 }
34 
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 
60 {
61 }
62 
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
void releaseResources() override
Implementation of the AudioSource method.
int numSamples
The number of samples in the buffer which the callback is expected to fill with data.
ToneGeneratorAudioSource()
Creates a ToneGeneratorAudioSource.
void getNextAudioBlock(const AudioSourceChannelInfo &) override
Implementation of the AudioSource method.
int getNumChannels() const noexcept
Returns the number of channels of audio data that this buffer contains.
int startSample
The first sample in the buffer from which the callback is expected to write data. ...
AudioBuffer< float > * buffer
The destination buffer to fill with audio data.
void prepareToPlay(int samplesPerBlockExpected, double sampleRate) override
Implementation of the AudioSource method.
void setSample(int destChannel, int destSample, Type newValue) noexcept
Sets a sample in the buffer.
Commonly used mathematical constants.
Used by AudioSource::getNextAudioBlock().
void setFrequency(double newFrequencyHz)
Sets the signal&#39;s frequency.
void setAmplitude(float newAmplitude)
Sets the signal&#39;s amplitude.