// ******************************** Audio Devices - System Audio Notification Client EventHandler
#region Audio Devices - System Audio Notification Client EventHandler
// handles the events from the System Audio Notification Client (one client for all Players) for this player only
// gets the main ui thread for the events (so the end user doesn't have to use "InvokeRequired")
// or should the "ISynchronizeInvoke" be used instead of the "control" method used here?
internal void SystemAudioDevicesChanged(object sender, SystemAudioDevicesEventArgs e)
{
if (_mediaSystemAudioDevicesChanged != null)
{
Control control = _display;
if (control == null)
{
FormCollection forms = Application.OpenForms;
if (forms != null && forms.Count > 0)
{
control = forms[0];
}
}
if (control != null)
{
OnSystemDevicesChangedDelegate d = new OnSystemDevicesChangedDelegate(OnSystemAudioDevicesChanged);
control.BeginInvoke(d, new object[] { e });
// what's the best?
//control.Invoke(new Action<SystemAudioDevicesEventArgs>(RaiseDeviceChangedEvent), new object[] { e });
//control.Invoke((MethodInvoker)delegate { RaiseDeviceChangedEvent(e); });
}
else
{
// no ui thread found, just fire away...
_mediaSystemAudioDevicesChanged(this, e);
}
}
}
internal static void AudioDevicesClientClose()
{
if (pm_AudioDevicesCallback != null)
{
try
{
IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator());
deviceEnumerator.UnregisterEndpointNotificationCallback(pm_AudioDevicesCallback);
pm_AudioDevicesCallback = null;
pm_AudioDevicesEventArgs = null;
if (deviceEnumerator != null)
{
Marshal.ReleaseComObject(deviceEnumerator); deviceEnumerator = null;
}
}
catch { /* ignore */ }
}
}
internal static bool AudioDevicesClientOpen()
{
bool result = true;
if (pm_AudioDevicesCallback == null)
{
try
{
IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator());
pm_AudioDevicesCallback = new AudioDevicesClient();
deviceEnumerator.RegisterEndpointNotificationCallback(pm_AudioDevicesCallback);
pm_AudioDevicesEventArgs = new SystemAudioDevicesEventArgs();
if (deviceEnumerator != null)
{
Marshal.ReleaseComObject(deviceEnumerator);
}
}
catch { result = false; }
}
return(result);
}
private void SystemDevicesChangedHandler(object sender, SystemAudioDevicesEventArgs e)
{
if (e.IsInputDevice)
{
return;
}
IMMDeviceCollection deviceCollection;
uint count;
IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator) new MMDeviceEnumerator();
deviceEnumerator.EnumAudioEndpoints(EDataFlow.eRender, (uint)DeviceState.Active, out deviceCollection);
deviceCollection.GetCount(out count);
Marshal.ReleaseComObject(deviceEnumerator);
if (deviceCollection != null)
{
Marshal.ReleaseComObject(deviceCollection);
}
if (e._notification == SystemAudioDevicesNotification.Activated)
{
if (count == 1)
{
if (_playing && !_paused)
{
// cannot resume playback
//if (pm_HasPeakMeter)
//{
// PeakMeter_Open(_audioDevice, true);
//}
// maybe this
Control control = _display;
if (control == null)
{
FormCollection forms = Application.OpenForms;
if (forms != null && forms.Count > 0)
{
control = forms[0];
}
}
if (control != null)
{
control.BeginInvoke(new MethodInvoker(delegate { AV_UpdateTopology(); }));
}
}
if (_mediaAudioDeviceChanged != null)
{
_mediaAudioDeviceChanged(this, EventArgs.Empty);
}
}
}
else if (_audioDevice == null)
{
if (pm_HasPeakMeter && e._notification == SystemAudioDevicesNotification.DefaultChanged)
{
if (count != 0)
{
PeakMeter_Open(_audioDevice, true);
}
else
{
pm_PeakMeterChannelCount = 0;
}
if (_mediaAudioDeviceChanged != null)
{
_mediaAudioDeviceChanged(this, EventArgs.Empty);
}
}
}
else
{
if (e._deviceId == _audioDevice.Id && (e._notification == SystemAudioDevicesNotification.Removed || e._notification == SystemAudioDevicesNotification.Disabled))
{
if (count != 0)
{
_audioDevice = null;
if (pm_HasPeakMeter)
{
PeakMeter_Open(_audioDevice, true);
}
}
else
{
pm_PeakMeterChannelCount = 0;
}
if (_mediaAudioDeviceChanged != null)
{
_mediaAudioDeviceChanged(this, EventArgs.Empty);
}
}
}
}
// raise the SystemAudioDevicesChanged event on the player's main ui thread
private void OnSystemAudioDevicesChanged(SystemAudioDevicesEventArgs e)
{
_mediaSystemAudioDevicesChanged(this, e);
}
