/// <summary>
/// Set the audio device the layer will output into.
/// </summary>
public void SetDevice(WasApiAudioDevice device)
{
if (device == null)
{
_layerContext = null;
return;
}
_layerContext = device.CreateLayerContext(out uint bufferSize);
_bufferLengthInFrames = (int)bufferSize;
}
/// <summary>
/// Late initialization for the WasApi backend's representation of this device.
/// Todo: Catch and handle all the possible COM exceptions here :/
/// </summary>
public WasApiLayerContext CreateLayerContext(out uint bufferSize)
{
var context = new WasApiLayerContext(this);
// Activate the device.
int error = ComHandle.Activate(ref IdAudioClient, ClsCtx.ALL, IntPtr.Zero, out object audioDevice);
var audioClient = (IAudioClient)audioDevice;
if (error != 0)
{
Win32Platform.CheckError($"Couldn't activate audio device of name {Name}.", true);
}
context.AudioClient = audioClient;
// Get device format.
error = audioClient.GetMixFormat(out IntPtr deviceFormat);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't detect the mix format of the audio client of {Name}.", true);
}
var audioClientFormat = Marshal.PtrToStructure <WaveFormat>(deviceFormat);
if (audioClientFormat !.ExtraSize >= 22)
{
audioClientFormat = Marshal.PtrToStructure <WaveFormatExtensible>(deviceFormat);
}
context.AudioClientFormat = audioClientFormat !.ToEmotionFormat();
long ticks = TimeSpan.FromMilliseconds(AudioLayer.BackendBufferExpectedAhead).Ticks;
error = audioClient.Initialize(AudioClientShareMode.Shared, AudioClientStreamFlags.None, ticks, 0, deviceFormat, Guid.Empty);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't initialize the audio client of device {Name}. Mix format is of the {audioClientFormat.Tag} type.", true);
}
error = audioClient.GetBufferSize(out bufferSize);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't get device {Name} buffer size.", true);
}
error = audioClient.GetService(IdAudioRenderClient, out object audioRenderClient);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't get the audio render client for device {Name}.", true);
}
context.RenderClient = (IAudioRenderClient)audioRenderClient;
return(context);
}
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($"Layer {Name} exited.", MessageSource.Audio);
_layerContext.Stop();
_layerContext = null;
}
/// <summary>
/// Late initialization for the WasApi backend's representation of this device.
/// </summary>
public WasApiLayerContext CreateLayerContext()
{
var context = new WasApiLayerContext(this);
// Activate the device.
int error = ComHandle.Activate(ref IdAudioClient, ClsCtx.ALL, IntPtr.Zero, out object audioDevice);
var audioClient = (IAudioClient)audioDevice;
if (error != 0)
{
Win32Platform.CheckError($"Couldn't activate audio device of name {Name}.", true);
}
context.AudioClient = audioClient;
// Get device format.
error = audioClient.GetMixFormat(out IntPtr deviceFormat);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't detect the mix format of the audio client of {Name}.", true);
}
var audioClientFormat = Marshal.PtrToStructure <WaveFormat>(deviceFormat);
if (audioClientFormat.ExtraSize >= 22)
{
audioClientFormat = Marshal.PtrToStructure <WaveFormatExtensible>(deviceFormat);
}
context.AudioClientFormat = audioClientFormat.ToEmotionFormat();
error = audioClient.Initialize(AudioClientShareMode.Shared, AudioClientStreamFlags.EventCallback, 0, 0, deviceFormat, Guid.Empty);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't initialize the audio client of device {Name}. Mix format is of the {audioClientFormat.Tag} type.", true);
}
// Get data.
error = audioClient.GetDevicePeriod(out long _, out long minPeriod);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't get device {Name} period.", true);
}
context.UpdatePeriod = minPeriod;
error = audioClient.GetBufferSize(out context.BufferSize);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't get device {Name} buffer size.", true);
}
// Set wait handle for when the client is ready to process a buffer.
context.WaitHandle = new EventWaitHandle(false, EventResetMode.AutoReset);
error = audioClient.SetEventHandle(context.WaitHandle.SafeWaitHandle.DangerousGetHandle());
if (error != 0)
{
Win32Platform.CheckError($"Couldn't set audio wait handle for device {Name}.", true);
}
error = audioClient.GetService(IdAudioRenderClient, out object audioRenderClient);
if (error != 0)
{
Win32Platform.CheckError($"Couldn't get the audio render client for device {Name}.", true);
}
context.RenderClient = (IAudioRenderClient)audioRenderClient;
return(context);
}
private void SetDevice(WasApiAudioDevice device)
{
_layerContext = device.CreateLayerContext();
}
