private void Timer_UpdatePeakValue(long ticks)
{
if (_isUpdatingPeakValue || AudioMeterInformation == null)
{
return;
}
_isUpdatingPeakValue = true;
var peakValue = _peakValue;
if (_isDisposed)
{
return;
}
try
{
AudioMeterInformation.GetPeakValue(out peakValue);
}
catch
{
//ignored - usually means the com object has been released, but the timer is still ticking
}
if (Math.Abs(_peakValue - peakValue) > 0.001)
{
_peakValue = peakValue;
OnPeakValueChanged(peakValue * 100);
}
_isUpdatingPeakValue = false;
}
private void LoadAudioMeterInformation(IMMDevice device)
{
//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_METER_INFORMATION_IID);
ex = Marshal.GetExceptionForHR(device.Activate(ref clsGuid, ClsCtx.Inproc, IntPtr.Zero, out result));
}
catch (Exception e)
{
ex = e;
}
if (ex != null)
{
ClearAudioMeterInformation();
return;
}
_audioMeterInformation = new AudioMeterInformation(result as IAudioMeterInformation);
}
private void ClearAudioMeterInformation()
{
if (_audioMeterInformation != null)
{
_audioMeterInformation.Dispose();
_audioMeterInformation = null;
}
}
private void LoadAudioMeterInformation(IMMDevice device)
{
//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_METER_INFORMATION_IID);
ex = Marshal.GetExceptionForHR(device.Activate(ref clsGuid, ClsCtx.Inproc, IntPtr.Zero, out result));
}
catch (Exception e)
{
ex = e;
}
if (ex != null)
{
ClearAudioMeterInformation();
return;
}
_audioMeterInformation = new AudioMeterInformation(result as IAudioMeterInformation);
}
private void ClearAudioMeterInformation()
{
if (_audioMeterInformation != null)
{
_audioMeterInformation.Dispose();
_audioMeterInformation = null;
}
}
