79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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The code included in this file is provided under the terms of the ISC license
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http://www.isc.org/downloads/software-support-policy/isc-license. Permission
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To use, copy, modify, and/or distribute this software for any purpose with or
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without fee is hereby granted provided that the above copyright notice and
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this permission notice appear in all copies.
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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ToneGeneratorAudioSource::ToneGeneratorAudioSource()
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: frequency (1000.0),
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sampleRate (44100.0),
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currentPhase (0.0),
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phasePerSample (0.0),
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amplitude (0.5f)
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{
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}
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ToneGeneratorAudioSource::~ToneGeneratorAudioSource()
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{
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}
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//==============================================================================
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void ToneGeneratorAudioSource::setAmplitude (const float newAmplitude)
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{
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amplitude = newAmplitude;
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}
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void ToneGeneratorAudioSource::setFrequency (const double newFrequencyHz)
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{
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frequency = newFrequencyHz;
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phasePerSample = 0.0;
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}
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//==============================================================================
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void ToneGeneratorAudioSource::prepareToPlay (int /*samplesPerBlockExpected*/, double rate)
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{
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currentPhase = 0.0;
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phasePerSample = 0.0;
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sampleRate = rate;
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}
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void ToneGeneratorAudioSource::releaseResources()
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{
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}
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void ToneGeneratorAudioSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
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{
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if (phasePerSample == 0.0)
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phasePerSample = MathConstants<double>::twoPi / (sampleRate / frequency);
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for (int i = 0; i < info.numSamples; ++i)
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{
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const float sample = amplitude * (float) std::sin (currentPhase);
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currentPhase += phasePerSample;
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for (int j = info.buffer->getNumChannels(); --j >= 0;)
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info.buffer->setSample (j, info.startSample + i, sample);
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}
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}
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} // namespace juce
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