MainComponent.h

// Requires the Juce audio_utils module for AudioProcessorPlayer

class MyAudioProcessor : public AudioProcessor
{
public:
	MyAudioProcessor() {}
	const String getName() const override { return "MyAudioProcessor"; }
	void prepareToPlay(double sampleRate, int maximumExpectedSamplesPerBlock) override {}
	void releaseResources() override {}
	void processBlock(AudioBuffer<float>& buffer, MidiBuffer & midiMessages) override
	{
		for (int i = 0; i < buffer.getNumSamples(); ++i)
		{
			float sample = jmap(m_rnd.nextFloat(), 0.0f, 1.0f, -0.1f, 0.1f);
			for (int j = 0; j < buffer.getNumChannels(); ++j)
			{
				buffer.setSample(j, i, sample);
			}
		}
	}
	double getTailLengthSeconds() const override { return 0.0; }
	bool acceptsMidi() const override { return false; }
	bool producesMidi() const override { return false; }
	AudioProcessorEditor * createEditor() override { return nullptr; }
	bool hasEditor() const override { return false; }
	int getNumPrograms() override { return 0; }
	int getCurrentProgram() override { return 0; }
	void setCurrentProgram(int index) override {}
	const String getProgramName(int index) override { return String(); }
	void changeProgramName(int index, const String & newName) override {}
	void getStateInformation(juce::MemoryBlock & destData) override {}
	void setStateInformation(const void * data, int sizeInBytes) override {}
private:
	Random m_rnd;
};

class MainComponent   : public Component
{
public:
    MainComponent()
    {
		m_adman.initialiseWithDefaultDevices(0, 2);
		m_processorplayer.setProcessor(&m_aproc);
		m_adman.addAudioCallback(&m_processorplayer);
		setSize (600, 400);
    }
	~MainComponent()
    {
	}
	void paint (Graphics& g) override
    {
        g.fillAll (getLookAndFeel().findColour (ResizableWindow::backgroundColourId));
		g.setFont (Font (16.0f));
        g.setColour (Colours::white);
        g.drawText ("Hello World!", getLocalBounds(), Justification::centred, true);
    }
	void resized() override
    {}
private:
	MyAudioProcessor m_aproc;
	AudioProcessorPlayer m_processorplayer;
	AudioDeviceManager m_adman;
	JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainComponent)
};