102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
#pragma once
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#include "AudioBufferQueue.h"
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//==============================================================================
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template <typename SampleType>
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class ScopeComponent : public juce::Component,
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private juce::Timer
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{
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public:
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using Queue = AudioBufferQueue<SampleType>;
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//==============================================================================
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ScopeComponent(Queue& queueToUse)
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: audioBufferQueue(queueToUse)
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{
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sampleData.fill(SampleType(0));
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setFramesPerSecond(30);
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}
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//==============================================================================
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void setFramesPerSecond(int framesPerSecond)
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{
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jassert(framesPerSecond > 0 && framesPerSecond < 1000);
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startTimerHz(framesPerSecond);
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}
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//==============================================================================
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void paint(juce::Graphics& g) override
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{
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g.fillAll(juce::Colours::black);
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g.setColour(juce::Colours::white);
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auto area = getLocalBounds();
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auto h = (SampleType)area.getHeight();
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auto w = (SampleType)area.getWidth();
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// Oscilloscope
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auto scopeRect = juce::Rectangle<SampleType>{ SampleType(0), SampleType(0), w, h / 2 };
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plot(sampleData.data(), sampleData.size(), g, scopeRect, SampleType(1), h / 4);
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// Spectrum
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auto spectrumRect = juce::Rectangle<SampleType>{ SampleType(0), h / 2, w, h / 2 };
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plot(spectrumData.data(), spectrumData.size() / 4, g, spectrumRect);
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}
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//==============================================================================
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void resized() override {}
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private:
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//==============================================================================
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Queue& audioBufferQueue;
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std::array<SampleType, Queue::bufferSize> sampleData;
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juce::dsp::FFT fft{ Queue::order };
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using WindowFun = juce::dsp::WindowingFunction<SampleType>;
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WindowFun windowFun{ (size_t)fft.getSize(), WindowFun::hann };
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std::array<SampleType, 2 * Queue::bufferSize> spectrumData;
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//==============================================================================
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void timerCallback() override
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{
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audioBufferQueue.pop(sampleData.data());
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juce::FloatVectorOperations::copy(spectrumData.data(), sampleData.data(), (int)sampleData.size());
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auto fftSize = (size_t)fft.getSize();
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jassert(spectrumData.size() == 2 * fftSize);
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windowFun.multiplyWithWindowingTable(spectrumData.data(), fftSize);
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fft.performFrequencyOnlyForwardTransform(spectrumData.data());
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static constexpr auto mindB = SampleType(-160);
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static constexpr auto maxdB = SampleType(0);
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for (auto& s : spectrumData)
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s = juce::jmap(juce::jlimit(mindB, maxdB, juce::Decibels::gainToDecibels(s) - juce::Decibels::gainToDecibels(SampleType(fftSize))), mindB, maxdB, SampleType(0), SampleType(1));
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repaint();
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}
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//==============================================================================
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static void plot(const SampleType* data,
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size_t numSamples,
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juce::Graphics& g,
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juce::Rectangle<SampleType> rect,
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SampleType scaler = SampleType(1),
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SampleType offset = SampleType(0))
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{
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auto w = rect.getWidth();
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auto h = rect.getHeight();
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auto right = rect.getRight();
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auto center = rect.getBottom() - offset;
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auto gain = h * scaler;
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for (size_t i = 1; i < numSamples; ++i)
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g.drawLine({ juce::jmap(SampleType(i - 1), SampleType(0), SampleType(numSamples - 1), SampleType(right - w), SampleType(right)),
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center - gain * data[i - 1],
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juce::jmap(SampleType(i), SampleType(0), SampleType(numSamples - 1), SampleType(right - w), SampleType(right)),
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center - gain * data[i] });
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}
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}; |