protected override void UpdateBackend()
{
try
{
// Check if the context is initialized.
if (!_layerContext.Initialized)
{
// Fill buffer before starting to prevent noise.
FillBuffer(_layerContext.RenderClient, _bufferLengthInFrames);
_layerContext.Start();
}
// Start if not started.
if (!_layerContext.Started)
{
_layerContext.Start();
}
// Get more frames.
int error = _layerContext.AudioClient.GetCurrentPadding(out int padding);
if (error != 0)
{
Engine.Log.Warning($"Couldn't get device padding, error {error}.", MessageSource.WasApi);
}
FillBuffer(_layerContext.RenderClient, _bufferLengthInFrames - padding);
}
catch (COMException ex)
{
// Audio device is the same, but the configuration has changed.
// Tracking these changes in the adapter is a huge drag, so we just catch the error instead.
// https://www.hresult.info/FACILITY_AUDCLNT/0x88890004
if ((uint)ex.ErrorCode == 0x88890004)
{
SetDevice(_context.DefaultDevice);
Engine.Log.Trace("Default audio device changed.", MessageSource.WasApi);
}
else
{
Engine.Log.Error(ex.ToString(), MessageSource.WasApi);
}
}
}
private void LayerThread()
{
if (Thread.CurrentThread.Name == null)
{
Thread.CurrentThread.Name = $"Audio Layer - {Name}";
}
Engine.Log.Trace($"Layer {Name} started.", MessageSource.Audio);
while (_alive && Engine.Status != EngineStatus.Stopped)
{
// Check if the device has changed.
if (_updateDevice)
{
SetDevice(_parent.DefaultDevice);
_updateDevice = false;
}
// If not playing, wait for it to start playing.
if (Status != PlaybackStatus.Playing)
{
_playWait.WaitOne();
continue;
}
if (_playlist.Count == 0 || _currentTrack == -1 || _currentTrack > _playlist.Count - 1)
{
Debug.Assert(false);
}
try
{
// Get the number of frames the buffer can hold total.
var frameCount = (int)_layerContext.BufferSize;
// Check if the context is initialized.
if (!_layerContext.Initialized)
{
FillBuffer(_layerContext.RenderClient, (int)_layerContext.BufferSize);
_layerContext.Start();
}
// Start if not started.
if (!_layerContext.Started)
{
_layerContext.Start();
}
// Wait until more of the buffer is requested.
bool success = _layerContext.WaitHandle.WaitOne(_layerContext.TimeoutPeriod);
if (!success)
{
Engine.Log.Warning($"Layer {Name} audio context timeout.", MessageSource.WasApi);
continue;
}
// Get more frames.
int error = _layerContext.AudioClient.GetCurrentPadding(out int padding);
if (error != 0)
{
Engine.Log.Warning($"Couldn't get device padding, error {error}.", MessageSource.WasApi);
}
if (!FillBuffer(_layerContext.RenderClient, frameCount - padding))
{
continue;
}
}
catch (COMException ex)
{
// Audio device has disappeared or whatever.
if ((uint)ex.ErrorCode == 0x88890004)
{
_updateDevice = true;
continue;
}
Engine.Log.Error(ex.ToString(), MessageSource.WasApi);
}
// If done, reset the audio client.
Task.Delay(_layerContext.TimeoutPeriod).Wait();
_layerContext.Stop();
_layerContext.Reset();
}
Engine.Log.Trace($"Layer {Name} exited.", MessageSource.Audio);
_layerContext.Stop();
_layerContext = null;
}
