/// <summary>
/// Generates the PC speaker waveform.
/// </summary>
private async Task GenerateWaveformAsync()
{
using var player = Audio.CreatePlayer();
FillWithSilence(player);
var buffer = new byte[4096];
var writeBuffer = buffer;
bool expandToStereo = false;
if (player.Format.Channels == 2)
{
writeBuffer = new byte[buffer.Length * 2];
expandToStereo = true;
}
player.BeginPlayback();
int idleCount = 0;
while (idleCount < 10000)
{
if (this.queuedNotes.TryDequeue(out var note))
{
int samples = GenerateSquareWave(buffer, note.Period);
int periods = note.PeriodCount;
if (expandToStereo)
{
ChannelAdapter.MonoToStereo(buffer.AsSpan(0, samples), writeBuffer.AsSpan(0, samples * 2));
samples *= 2;
}
while (periods > 0)
{
Audio.WriteFullBuffer(player, writeBuffer.AsSpan(0, samples));
periods--;
}
GenerateSilence(buffer);
idleCount = 0;
}
else
{
while (player.WriteData(buffer) > 0)
{
}
await Task.Delay(5, this.cancelGenerateWaveform.Token);
idleCount++;
}
this.cancelGenerateWaveform.Token.ThrowIfCancellationRequested();
}
}
private void GenerateWaveforms()
{
var buffer = new float[1024];
float[] playBuffer;
bool expandToStereo = this.audioPlayer.Format.Channels == 2;
if (expandToStereo)
{
playBuffer = new float[buffer.Length * 2];
}
else
{
playBuffer = buffer;
}
this.audioPlayer.BeginPlayback();
fillBuffer();
while (!endThread)
{
Audio.WriteFullBuffer(this.audioPlayer, playBuffer);
fillBuffer();
}
this.audioPlayer.StopPlayback();
void fillBuffer()
{
this.synth.GetData(buffer);
if (expandToStereo)
{
ChannelAdapter.MonoToStereo(buffer.AsSpan(), playBuffer.AsSpan());
}
}
}