/// <summary>
/// The Initialize Audio Client
/// </summary>
/// <param name="audioFlow"></param>
/// <param name="_deviceEnumerator"></param>
private void InitializeAudioClient()
{
//Get Audio Client from device
COMResult result = _audioDevice.Activate(typeof(IAudioClient).GUID, 0, IntPtr.Zero, out object obj);
_audioClient = (IAudioClient)obj;
//Get Audio Meter from device
result = _audioDevice.Activate(typeof(IAudioMeterInformation).GUID, 0, IntPtr.Zero, out obj);
_audioMeter = (IAudioMeterInformation)obj;
//Get Audio End Point
result = _audioDevice.Activate(typeof(IAudioEndpointVolume).GUID, 0, IntPtr.Zero, out obj);
_audioEndpointVolume = (IAudioEndpointVolume)obj;
_audioEndpointVolume.RegisterControlChangeNotify(classCallBack);
//Initialize Audio Client.
_sessionGuid = new Guid();
result = _audioClient.GetMixFormat(out waveFormat);
AudioClientStreamFlags streamFlag = AudioClientStreamFlags.None;
if (_audioDataFlow == AudioDataFlow.eRender)
{
streamFlag = AudioClientStreamFlags.Loopback;
}
result = _audioClient.Initialize(AudioClientMode.Shared, streamFlag, 10000000, 0, waveFormat, ref _sessionGuid);
result = _audioClient.Start();
//Change wave format here
SetupWaveFormat(waveFormat);
result = _audioEndpointVolume.GetChannelCount(out _channelCount);
}
private void InitializeAudio(AudioDataFlow audioFlow, IMMDeviceEnumerator deviceEnumerator)
{
//Get Audio Device
COMResult result = deviceEnumerator.GetDefaultAudioEndpoint(audioFlow, EndPointRole.eMultimedia, out _audioDevice);
//Register End point notification
_notifyClient = new MMNotificationClient();
result = deviceEnumerator.RegisterEndpointNotificationCallback(_notifyClient);
//Get Audio Client from device
result = _audioDevice.Activate(typeof(IAudioClient).GUID, 0, IntPtr.Zero, out object obj);
_audioClient = (IAudioClient)obj;
//Get Audio Meter from device
result = _audioDevice.Activate(typeof(IAudioMeterInformation).GUID, 0, IntPtr.Zero, out obj);
_audioMeter = (IAudioMeterInformation)obj;
//Initialize Audio Client.
_sessionGuid = new Guid();
result = _audioClient.GetMixFormat(out waveFormat);
AudioClientStreamFlags streamFlag = AudioClientStreamFlags.None;
if (audioFlow == AudioDataFlow.eRender)
{
streamFlag = AudioClientStreamFlags.Loopback;
}
result = _audioClient.Initialize(AudioClientMode.Shared, streamFlag, 10000000, 0, waveFormat, ref _sessionGuid);
//Get Capture Client.
result = _audioClient.GetService(typeof(IAudioCaptureClient).GUID, out obj);
Marshal.ThrowExceptionForHR((int)result);
_audioCaptureClient = (IAudioCaptureClient)obj;
result = _audioClient.Start();
//Change wave format here
SetupWaveFormat(waveFormat);
}
/// <summary>
/// Get HID Audio Device UUID
/// </summary>
/// <param name="dataFlow"></param>
/// <param name="pid"></param>
/// <param name="vid"></param>
/// <returns></returns>
private string GetHIDAudioDeviceUUID(AudioDataFlow dataFlow, string pid, string vid)
{
COMResult result = COMResult.E_FAIL;
PropertyKey proKey;
PropVariant proVar;
result = _deviceEnumerator.EnumAudioEndpoints(dataFlow, AudioDeviceState.DEVICE_STATE_ACTIVE, out IMMDeviceCollection devCollect);
result = devCollect.GetCount(out int devCnt);
for (int i = 0; i < devCnt; i++)
{
result = devCollect.Item(i, out IMMDevice tDev);
tDev.GetId(out string devID);
tDev.OpenPropertyStore(StorageAccessMode.STGM_READ, out IPropertyStore ppt);
ppt.GetCount(out int ppCnt);
for (int j = 0; j < ppCnt; j++)
{
result = ppt.GetAt(j, out proKey);
result = ppt.GetValue(ref proKey, out proVar);
if (proVar.DataType == System.Runtime.InteropServices.VarEnum.VT_LPWSTR ||
proVar.DataType == System.Runtime.InteropServices.VarEnum.VT_LPSTR)
{
if (proKey.formatId.ToString().Equals(PKEY_AUDIOENDPOINT_HWID.formatId.ToString()) &&
proKey.propertyId == PKEY_AUDIOENDPOINT_HWID.propertyId)
{
string hwID = proVar.Value.ToString();
if (!GetPIDVIDFromHWIDString(hwID, out string hwPid, out string hwVid))
{
continue;
}
if (vid.Equals(hwVid, StringComparison.CurrentCultureIgnoreCase) &&
pid.Equals(hwPid, StringComparison.CurrentCultureIgnoreCase))
{
return(devID);
}
}
}
}
}
return(string.Empty);
}
/// <summary>
/// Get IMMDevice
/// </summary>
/// <param name="initFlow"></param>
/// <param name="pid"></param>
/// <param name="vid"></param>
/// <returns>Null means Failed</returns>
private IMMDevice GetIMMDevice(AudioDataFlow initFlow, string pid, string vid)
{
COMResult result = COMResult.E_FAIL;
IMMDevice _device = null;
if (initFlow == AudioDataFlow.eAll)
{
//Not support get both render and capture.
return(_device);
}
string devUUID = GetHIDAudioDeviceUUID(initFlow, pid, vid);
if (string.IsNullOrEmpty(devUUID))
{
//Failed to get UUID, Get Default Endpoint
result = _deviceEnumerator.GetDefaultAudioEndpoint(initFlow, EndPointRole.eCommunications, out _device);
}
else
{
result = _deviceEnumerator.GetDevice(devUUID, out _device);
}
return(_device);
}