/// <summary>
/// Returns a list of the system's enabled audio input devices. Returns null if no enabled audio input devices are present. See also: Player.AudioInput.DeviceCount and Player.AudioInput.GetDefaultDevice.
/// </summary>
public AudioInputDevice[] GetDevices()
{
AudioInputDevice[] audioDevices = null;
_base._lastError = HResult.MF_E_NO_AUDIO_RECORDING_DEVICE;
IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator) new MMDeviceEnumerator();
deviceEnumerator.EnumAudioEndpoints(EDataFlow.eCapture, (uint)DeviceState.Active, out IMMDeviceCollection deviceCollection);
Marshal.ReleaseComObject(deviceEnumerator);
if (deviceCollection != null)
{
deviceCollection.GetCount(out uint count);
if (count > 0)
{
audioDevices = new AudioInputDevice[count];
for (int i = 0; i < count; i++)
{
audioDevices[i] = new AudioInputDevice();
deviceCollection.Item((uint)i, out IMMDevice device);
Player.GetDeviceInfo(device, audioDevices[i]);
Marshal.ReleaseComObject(device);
}
_base._lastError = Player.NO_ERROR;
}
Marshal.ReleaseComObject(deviceCollection);
}
return(audioDevices);
}
// ******************************** 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);
}
/// <summary>
/// Returns the system's default audio input device. Returns null if no default audio input device is present. See also: Player.AudioInput.GetDevices.
/// </summary>
public AudioInputDevice GetDefaultDevice()
{
AudioInputDevice audioDevice = null;
IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator) new MMDeviceEnumerator();
deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out IMMDevice device);
Marshal.ReleaseComObject(deviceEnumerator);
if (device != null)
{
audioDevice = new AudioInputDevice();
Player.GetDeviceInfo(device, audioDevice);
Marshal.ReleaseComObject(device);
_base._lastError = Player.NO_ERROR;
}
else
{
_base._lastError = HResult.MF_E_NO_AUDIO_RECORDING_DEVICE;
}
return(audioDevice);
}