internal int GetCount()
{
int result;
Marshal.ThrowExceptionForHR(_AudioMeterInformation.GetMeteringChannelCount(out result));
return(result);
}
public static float[] ReadPeakValues(IAudioMeterInformation meter)
{
var ret = new float[2];
try
{
uint chanCount = meter.GetMeteringChannelCount();
if (chanCount > 0)
{
var arrayPtr = Marshal.AllocHGlobal((int)chanCount * 4); // 4 bytes in float
if (meter.GetChannelsPeakValues(chanCount, arrayPtr) == HRESULT.S_OK)
{
var values = new float[chanCount];
Marshal.Copy(arrayPtr, values, 0, (int)chanCount);
if (chanCount == 1)
{
ret[0] = values[0];
ret[1] = values[0];
}
else
{
ret[0] = values[0];
ret[1] = values[1];
}
}
}
}
catch (Exception ex) when(ex.Is(HRESULT.AUDCLNT_E_DEVICE_INVALIDATED))
{
// Expected in some cases.
}
return(ret);
}
// ******************************** Audio Devices - Audio Input Peak Meter - Open / Close / GetValues
#region Audio Devices - Audio Input Peak Meter - Open / Close / GetValues
internal bool InputMeter_Open(AudioInputDevice device, bool change)
{
// tested for null at event subscription
if (!pm_HasInputMeter || change)
{
IMMDeviceEnumerator deviceEnumerator = null;
IMMDevice levelDevice = null;
if (pm_HasInputMeter)
{
InputMeter_Close();
}
try
{
deviceEnumerator = (IMMDeviceEnumerator) new MMDeviceEnumerator();
deviceEnumerator.GetDevice(device._id, out levelDevice);
if (levelDevice != null)
{
levelDevice.Activate(ref IID_IAudioMeterInformation, 3, IntPtr.Zero, out object levelDeviceInfo);
pm_InputMeterInfo = (IAudioMeterInformation)levelDeviceInfo;
pm_InputMeterInfo.GetMeteringChannelCount(out pm_InputMeterChannelCount);
if (pm_InputMeterChannelCount > MAX_AUDIO_CHANNELS)
{
pm_InputMeterChannelCount = MAX_AUDIO_CHANNELS;
}
if (pm_InputMeterValues == null)
{
pm_InputMeterValues = new float[MAX_AUDIO_CHANNELS];
pm_InputMeterValuesStop = new float[MAX_AUDIO_CHANNELS];
for (int i = 0; i < MAX_AUDIO_CHANNELS; i++)
{
pm_InputMeterValuesStop[i] = STOP_VALUE;
}
}
pm_HasInputMeter = true;
//StartSystemDevicesChangedHandlerCheck();
}
}
catch
{ /* ignore */
}
if (levelDevice != null)
{
Marshal.ReleaseComObject(levelDevice);
}
if (deviceEnumerator != null)
{
Marshal.ReleaseComObject(deviceEnumerator);
}
}
return(pm_HasInputMeter);
}
// ******************************** Player Peak Meter - Open / Close / GetValues
#region Player Peak Meter - Open / Close / GetValues
internal bool PeakMeter_Open(AudioDevice device, bool change)
{
if (!pm_HasPeakMeter || change)
{
IMMDeviceEnumerator deviceEnumerator = null;
IMMDevice levelDevice = null;
object levelDeviceInfo;
if (pm_HasPeakMeter)
{
PeakMeter_Close();
}
try
{
deviceEnumerator = (IMMDeviceEnumerator) new MMDeviceEnumerator();
if (device == null)
{
deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out levelDevice);
}
else
{
deviceEnumerator.GetDevice(device._id, out levelDevice);
}
if (levelDevice != null)
{
levelDevice.Activate(ref IID_IAudioMeterInformation, 3, IntPtr.Zero, out levelDeviceInfo);
pm_PeakMeterInfo = (IAudioMeterInformation)levelDeviceInfo;
pm_PeakMeterInfo.GetMeteringChannelCount(out pm_PeakMeterChannelCount);
if (pm_PeakMeterChannelCount > MAX_AUDIO_CHANNELS)
{
pm_PeakMeterChannelCount = MAX_AUDIO_CHANNELS;
}
if (pm_PeakMeterValues == null)
{
pm_PeakMeterValues = new float[MAX_AUDIO_CHANNELS];
pm_PeakMeterValuesStop = new float[MAX_AUDIO_CHANNELS];
for (int i = 0; i < MAX_AUDIO_CHANNELS; i++)
{
pm_PeakMeterValuesStop[i] = STOP_VALUE;
}
}
pm_HasPeakMeter = true;
StartSystemDevicesChangedHandlerCheck();
}
}
catch
{ /* ignore */
}
if (levelDevice != null)
{
Marshal.ReleaseComObject(levelDevice);
}
if (deviceEnumerator != null)
{
Marshal.ReleaseComObject(deviceEnumerator);
}
}
return(pm_HasPeakMeter);
}