AudioStreamGeneratorExample.cs

public partial class Main : Control
{
	AudioStreamPlayer _audioStreamPlayer = default!;
	AudioStreamGenerator _streamGenerator = default!;
	AudioStreamPlayback _streamPlayback = default!;
	SineWave _sineWave = new SineWave();

	int _sampleHz = 22050;
	int _pulseHz = 440;
	
	public override void _Ready()
	{
		_audioStreamPlayer = GetNode<AudioStreamPlayer>("AudioStreamPlayer");
		_streamGenerator = (AudioStreamGenerator) _audioStreamPlayer.Stream;
		_streamGenerator.MixRate = 22050f;
		_audioStreamPlayer.Play();
		_streamPlayback = _audioStreamPlayer.GetStreamPlayback();
		FillBuffer();
	}

	void FillBuffer()
	{
		var toFill = ((AudioStreamGeneratorPlayback)_streamPlayback).GetFramesAvailable();
		
		((AudioStreamGeneratorPlayback)_streamPlayback).PushBuffer(_sineWave.GetBuffer(toFill));
	}

	// Called every frame. 'delta' is the elapsed time since the previous frame.
	public override void _Process(double delta)
	{
		FillBuffer();
	}
}