/// <summary>
/// Initializes the audio capture device.
/// </summary>
/// <param name="deviceDescription">
/// The friendly name description of the device to capture from. This is usually
/// something like "Microphone Array (USB Audio)". To capture from
/// the default device, pass in NULL or an empty string.
/// </param>
public void Initialize(string deviceDescription)
{
// Activate native audio COM objects on a thread-pool thread to ensure that they are in an MTA
Task.Run(() =>
{
if (string.IsNullOrEmpty(deviceDescription))
{
// use the default console device
this.audioDevice = DeviceUtil.GetDefaultDevice(EDataFlow.Capture, ERole.Console);
}
else
{
this.audioDevice = DeviceUtil.GetDeviceByName(EDataFlow.Capture, deviceDescription);
}
if (this.audioDevice != null)
{
// Try to get the volume control
object obj = this.audioDevice.Activate(new Guid(Guids.IAudioEndpointVolumeIIDString), ClsCtx.ALL, IntPtr.Zero);
this.volume = (IAudioEndpointVolume)obj;
// Now create an IAudioEndpointVolumeCallback object that wraps the callback and register it with the endpoint.
this.volumeCallback = new AudioEndpointVolumeCallback(this.AudioVolumeCallback);
this.volume.RegisterControlChangeNotify(this.volumeCallback);
}
}).Wait();
}
/// <summary>
/// Initializes the audio capture device.
/// </summary>
/// <param name="deviceDescription">
/// The friendly name description of the device to capture from. This is usually
/// something like "Microphone Array (USB Audio)". To capture from
/// the default device, pass in NULL or an empty string.
/// </param>
public void Initialize(string deviceDescription)
{
Exception taskException = null;
// Activate native audio COM objects on a thread-pool thread to ensure that they are in an MTA
Task.Run(() =>
{
try
{
if (string.IsNullOrEmpty(deviceDescription))
{
// use the default console device
this.audioDevice = DeviceUtil.GetDefaultDevice(EDataFlow.Capture, ERole.Console);
}
else
{
this.audioDevice = DeviceUtil.GetDeviceByName(EDataFlow.Capture, deviceDescription);
}
if (this.audioDevice != null)
{
// Try to get the volume control
object obj = this.audioDevice.Activate(new Guid(Guids.IAudioEndpointVolumeIIDString), ClsCtx.ALL, IntPtr.Zero);
this.volume = (IAudioEndpointVolume)obj;
// Now create an IAudioEndpointVolumeCallback object that wraps the callback and register it with the endpoint.
this.volumeCallback = new AudioEndpointVolumeCallback(this.AudioVolumeCallback);
this.volume.RegisterControlChangeNotify(this.volumeCallback);
}
}
catch (Exception e)
{
taskException = e;
}
}).Wait();
// do error checking on the main thread
if (taskException != null)
{
// rethrow exception
throw taskException;
}
else if (this.audioDevice == null)
{
throw new IOException(string.IsNullOrEmpty(deviceDescription) ?
"No default audio capture device found." :
$"Audio capture device {deviceDescription} not found.");
}
}
