/// <summary>
/// Stop Recording
/// </summary>
public void StopRecording()
{
if (captureState == WasapiCaptureState.Disposed)
{
throw new ObjectDisposedException(nameof(WasapiCaptureRT));
}
if (captureState != WasapiCaptureState.Recording)
{
return;
}
captureState = WasapiCaptureState.Stopped;
captureTask?.Wait(5000);
Debug.WriteLine("WasapiCaptureRT stopped");
}
/// <summary>
/// Initializes the capture device. Must be called on the UI (STA) thread.
/// If not called manually then StartRecording() will call it internally.
/// </summary>
public async Task InitAsync()
{
if (captureState == WasapiCaptureState.Disposed)
{
throw new ObjectDisposedException(nameof(WasapiCaptureRT));
}
if (captureState != WasapiCaptureState.Uninitialized)
{
throw new InvalidOperationException("Already initialized");
}
/* var icbh = new ActivateAudioInterfaceCompletionHandler(ac2 => InitializeCaptureDevice((IAudioClient)ac2));
* IActivateAudioInterfaceAsyncOperation activationOperation;
* // must be called on UI thread
* NativeMethods.ActivateAudioInterfaceAsync(device, IID_IAudioClient2, IntPtr.Zero, icbh, out activationOperation);
*
* audioClient = new AudioClient((IAudioClient)(await icbh));
*
* hEvent = NativeMethods.CreateEventExW(IntPtr.Zero, IntPtr.Zero, 0, EventAccess.EVENT_ALL_ACCESS);
* audioClient.SetEventHandle(hEvent);*/
var icbh = new ActivateAudioInterfaceCompletionHandler(ac2 =>
{
if (this.audioClientProperties != null)
{
IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(this.audioClientProperties.Value));
Marshal.StructureToPtr(this.audioClientProperties.Value, p, false);
ac2.SetClientProperties(p);
Marshal.FreeHGlobal(p);
// TODO: consider whether we can marshal this without the need for AllocHGlobal
}
InitializeCaptureDevice((IAudioClient2)ac2);
audioClient = new AudioClient((IAudioClient2)ac2);
hEvent = NativeMethods.CreateEventExW(IntPtr.Zero, IntPtr.Zero, 0, EventAccess.EVENT_ALL_ACCESS);
audioClient.SetEventHandle(hEvent);
});
IActivateAudioInterfaceAsyncOperation activationOperation;
// must be called on UI thread
NativeMethods.ActivateAudioInterfaceAsync(device, IID_IAudioClient2, IntPtr.Zero, icbh, out activationOperation);
await icbh;
captureState = WasapiCaptureState.Stopped;
}
/// <summary>
/// Start Recording
/// </summary>
public async void StartRecording()
{
if (captureState == WasapiCaptureState.Disposed)
{
throw new ObjectDisposedException(nameof(WasapiCaptureRT));
}
if (captureState == WasapiCaptureState.Uninitialized)
{
await InitAsync();
}
captureState = WasapiCaptureState.Recording;
captureTask = Task.Run(() => DoRecording());
Debug.WriteLine("Recording...");
}
/// <summary>
/// Initializes the capture device. Must be called on the UI (STA) thread.
/// If not called manually then StartRecording() will call it internally.
/// </summary>
public async Task InitAsync()
{
if (captureState == WasapiCaptureState.Disposed)
{
throw new ObjectDisposedException(nameof(WasapiCaptureRT));
}
if (captureState != WasapiCaptureState.Uninitialized)
{
throw new InvalidOperationException("Already initialized");
}
var icbh = new ActivateAudioInterfaceCompletionHandler(ac2 => InitializeCaptureDevice((IAudioClient)ac2));
IActivateAudioInterfaceAsyncOperation activationOperation;
// must be called on UI thread
NativeMethods.ActivateAudioInterfaceAsync(device, IID_IAudioClient2, IntPtr.Zero, icbh, out activationOperation);
audioClient = new AudioClient((IAudioClient)(await icbh));
hEvent = NativeMethods.CreateEventExW(IntPtr.Zero, IntPtr.Zero, 0, EventAccess.EVENT_ALL_ACCESS);
audioClient.SetEventHandle(hEvent);
captureState = WasapiCaptureState.Stopped;
}
/// <summary>
/// Dispose
/// </summary>
public void Dispose()
{
if (captureState == WasapiCaptureState.Disposed)
{
return;
}
try
{
StopRecording();
NativeMethods.CloseHandle(hEvent);
audioClient?.Dispose();
}
catch (Exception ex)
{
Debug.WriteLine("Exception disposing WasapiCaptureRT: " + ex.ToString());
}
hEvent = IntPtr.Zero;
audioClient = null;
captureState = WasapiCaptureState.Disposed;
}
