private void ClearAudioEndpointVolume()
{
if (_audioEndpointVolume != null)
{
_audioEndpointVolume.OnVolumeNotification -= AudioEndpointVolume_OnVolumeNotification;
_audioEndpointVolume.Dispose();
_audioEndpointVolume = null;
}
}
private void GetAudioEndpointVolume(IMMDevice device)
{
//Prevent further look ups
if (_audioEndpointVolumeUnavailable)
{
return;
}
//Don't even bother looking up volume for disconnected devices
if (State == DeviceState.NotPresent || State == DeviceState.Unplugged)
{
return;
}
//This should be all on the COM thread to avoid any
//weird lookups on the result COM object not on an STA Thread
ComThread.Assert();
object result = null;
Exception ex;
//Need to catch here, as there is a chance that unauthorized is thrown.
//It's not an HR exception, but bubbles up through the .net call stack
try
{
var clsGuid = new Guid(ComIIds.AUDIO_ENDPOINT_VOLUME_IID);
ex = Marshal.GetExceptionForHR(device.Activate(ref clsGuid, ClsCtx.Inproc, IntPtr.Zero, out result));
}
catch (Exception e)
{
ex = e;
}
_audioEndpointVolumeUnavailable = ex != null;
if (_audioEndpointVolumeUnavailable)
{
return;
}
_audioEndpointVolume = new AudioEndpointVolume(result as IAudioEndpointVolume);
}
private void LoadAudioEndpointVolume()
{
//Don't even bother looking up volume for disconnected devices
if (!State.HasFlag(DeviceState.Active))
{
ClearAudioEndpointVolume();
return;
}
//This should be all on the COM thread to avoid any
//weird lookups on the result COM object not on an STA Thread
ComThread.Assert();
object result = null;
Exception ex;
//Need to catch here, as there is a chance that unauthorized is thrown.
//It's not an HR exception, but bubbles up through the .net call stack
try
{
var clsGuid = new Guid(ComInterfaceIds.AUDIO_ENDPOINT_VOLUME_IID);
ex = Marshal.GetExceptionForHR(Device.Activate(ref clsGuid, ClassContext.Inproc, IntPtr.Zero, out result));
}
catch (Exception e)
{
ex = e;
}
if (ex != null)
{
ClearAudioEndpointVolume();
return;
}
_audioEndpointVolume = new AudioEndpointVolume(result as IAudioEndpointVolume);
_isMuted = _audioEndpointVolume.Mute;
_volume = _audioEndpointVolume.MasterVolumeLevelScalar.DeNormalizeVolume();
}
internal AudioEndpointVolumeCallback(AudioEndpointVolume handler)
{
_handler = new WeakReference(handler);
}
internal AudioEndpointVolumeCallback(AudioEndpointVolume handler)
{
_handler = new WeakReference(handler);
}
private void LoadAudioEndpointVolume(IMMDevice device)
{
//Don't even bother looking up volume for disconnected devices
if (!State.HasFlag(DeviceState.Active))
{
ClearAudioEndpointVolume();
return;
}
//This should be all on the COM thread to avoid any
//weird lookups on the result COM object not on an STA Thread
ComThread.Assert();
object result = null;
Exception ex;
//Need to catch here, as there is a chance that unauthorized is thrown.
//It's not an HR exception, but bubbles up through the .net call stack
try
{
var clsGuid = new Guid(ComIIds.AUDIO_ENDPOINT_VOLUME_IID);
ex = Marshal.GetExceptionForHR(device.Activate(ref clsGuid, ClsCtx.Inproc, IntPtr.Zero, out result));
}
catch (Exception e)
{
ex = e;
}
if (ex != null)
{
ClearAudioEndpointVolume();
return;
}
_audioEndpointVolume = new AudioEndpointVolume(result as IAudioEndpointVolume);
}
private void ClearAudioEndpointVolume()
{
if (_audioEndpointVolume != null)
{
_audioEndpointVolume.OnVolumeNotification -= AudioEndpointVolume_OnVolumeNotification;
_audioEndpointVolume.Dispose();
_audioEndpointVolume = null;
}
}
