/// <summary>
/// Initializes a new instance of the <see cref="SessionCreatedEventArgs"/> class.
/// </summary>
/// <param name="newSession">The <see cref="AudioSessionControl"/> object of the audio session that was created.</param>
/// <exception cref="System.ArgumentNullException"><paramref name="newSession"/> must not be null.</exception>
public SessionCreatedEventArgs(AudioSessionControl newSession)
{
if (newSession == null)
{
throw new ArgumentNullException("newSession");
}
NewSession = newSession;
}
/// <summary>
/// Notifies the registered processes that the audio session has been created.
/// </summary>
/// <param name="newSession">Pointer to the <see cref="AudioSessionControl"/> object of the audio session that was created.</param>
/// <returns>HRESULT</returns>
int IAudioSessionNotification.OnSessionCreated([In] IntPtr newSession)
{
if (SessionCreated != null)
{
var sessionControl = new AudioSessionControl(newSession);
//make sure, the reference can be used within our application
//in order to prevent the instance from being released, add a reference
//if it won't be used in our application (eventhandlers and so on), the
//destructor will release the instance.
((IUnknown)sessionControl).AddRef();
SessionCreated(this, new SessionCreatedEventArgs(sessionControl));
}
return((int)HResult.S_OK);
}
/// <summary>
/// Retrieves an audio session control.
/// </summary>
/// <param name="audioSessionGuid">If the GUID does not identify a session that has been previously opened, the call opens a new but empty session. If the value is Guid.Empty, the method assigns the stream to the default session.</param>
/// <param name="streamFlags">Specifies the status of the flags for the audio stream.</param>
/// <param name="sessionControl">The <see cref="AudioSessionControl"/> of the specified <paramref name="audioSessionGuid"/>.</param>
/// <returns>HRESULT</returns>
public unsafe int GetAudioSessionControlNative(Guid audioSessionGuid, int streamFlags,
out AudioSessionControl sessionControl)
{
sessionControl = null;
IntPtr ptr = IntPtr.Zero;
int result = LocalInterop.Calli(UnsafeBasePtr, &audioSessionGuid, streamFlags, &ptr,
((void **)(*(void **)UnsafeBasePtr))[3]);
if (ptr != IntPtr.Zero)
{
sessionControl = new AudioSessionControl(ptr);
}
return(result);
}