public MorphicResult <MMDevice, WindowsComError> GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role)
{
IMMDevice?immDevice;
var result = _mmDeviceEnumerator.GetDefaultAudioEndpoint(dataFlow, role, out immDevice);
if (result != ExtendedPInvoke.S_OK)
{
if (result == ExtendedPInvoke.E_NOTFOUND)
{
throw new NoDeviceIsAvailableException();
}
else
{
// TODO: consider throwing more granular exceptions here
var comException = new COMException("IMMDeviceEnumerator.GetDefaultAudioEndpoint failed", Marshal.GetExceptionForHR(result));
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
}
if (immDevice is null)
{
// NOTE: this code should never be executed since GetDefaultAudioEndpoint should have returned an HRESULT of E_POINTER if it failed
var comException = new COMException("IMMDeviceEnumerator.GetDefaultAudioEndpoint returned a null pointer", new NullReferenceException());
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
var mmDevice = MMDevice.CreateFromIMMDevice(immDevice !);
return(MorphicResult.OkResult(mmDevice));
}
public static MorphicResult <MMDeviceEnumerator, WindowsComError> CreateNew()
{
// get a Type reference for MMDeviceEnumerator
Type MMDeviceEnumeratorType;
try
{
MMDeviceEnumeratorType = Type.GetTypeFromCLSID(new Guid(CLSID_MMDeviceEnumerator), true) !;
}
catch
{
// TODO: consider providing a more specific exception result
return(MorphicResult.ErrorResult(WindowsComError.ComException(new COMException())));
}
MMDeviceEnumerator result;
try
{
// NOTE: objects created by Activator.CreateInstance do not need to be manually freed
var mmDeviceEnumeratorAsNullable = Activator.CreateInstance(MMDeviceEnumeratorType) as IMMDeviceEnumerator;
if (mmDeviceEnumeratorAsNullable is null)
{
throw new COMException();
}
result = new MMDeviceEnumerator(mmDeviceEnumeratorAsNullable !);
}
catch
{
// TODO: in the future, consider throwing different exceptions for different failure conditions
throw new COMException();
}
return(MorphicResult.OkResult(result));
}
public MorphicResult <MorphicUnit, WindowsComError> SetMasterMuteState(bool muteState)
{
// set the master mute state
var result = this._audioEndpointVolume.SetMute(muteState ? 1 : 0, IntPtr.Zero);
if (result != ExtendedPInvoke.S_OK)
{
// TODO: consider throwing more granular exceptions here
var comException = new COMException("IAudioEndpointVolume.SetMute failed", Marshal.GetExceptionForHR(result));
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
return(MorphicResult.OkResult());
}
public MorphicResult <float, WindowsComError> GetMasterVolumeLevel()
{
// get the master volume level
Single volumeLevelScalar;
var result = this._audioEndpointVolume.GetMasterVolumeLevelScalar(out volumeLevelScalar);
if (result != ExtendedPInvoke.S_OK)
{
// TODO: consider throwing more granular exceptions here
var comException = new COMException("IAudioEndpointVolume.GetMasterVolumeLevelScalar failed", Marshal.GetExceptionForHR(result));
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
_lastMasterVolumeLevel = volumeLevelScalar;
return(MorphicResult.OkResult(volumeLevelScalar));
}
public MorphicResult <bool, WindowsComError> GetMasterMuteState()
{
// get the master mute state
Int32 isMutedAsInt32;
var result = this._audioEndpointVolume.GetMute(out isMutedAsInt32);
if (result != ExtendedPInvoke.S_OK)
{
// TODO: consider throwing more granular exceptions here
var comException = new COMException("IAudioEndpointVolume.GetMute failed", Marshal.GetExceptionForHR(result));
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
var muteState = (isMutedAsInt32 != 0) ? true : false;
_lastMasterMuteState = muteState;
return(MorphicResult.OkResult(muteState));
}
public MorphicResult <MorphicUnit, WindowsComError> SetMasterVolumeLevel(float volumeLevel)
{
if (volumeLevel < 0.0 || volumeLevel > 1.0)
{
throw new ArgumentOutOfRangeException(nameof(volumeLevel));
}
// set the master volume level
var result = this._audioEndpointVolume.SetMasterVolumeLevelScalar(volumeLevel, IntPtr.Zero);
if (result != ExtendedPInvoke.S_OK)
{
// TODO: consider throwing more granular exceptions here
var comException = new COMException("IAudioEndpointVolume.GetMasterVolumeLevelScalar failed", Marshal.GetExceptionForHR(result));
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
return(MorphicResult.OkResult());
}
public MorphicResult <Object, WindowsComError> Activate(Guid iid, CLSCTX clsCtx)
{
Object? @interface;
var result = _immDevice.Activate(iid, clsCtx, IntPtr.Zero, out @interface);
if (result != ExtendedPInvoke.S_OK)
{
// TODO: consider throwing more granular exceptions here
var comException = new COMException("IMMDeviceEnumerator.GetDefaultAudioEndpoint failed", Marshal.GetExceptionForHR(result));
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
if (@interface is null)
{
// NOTE: this code should never be executed since Activate should have returned an HRESULT of E_POINTER if it failed
var comException = new COMException("IMMDevice.Activate returned a null pointer", new NullReferenceException());
return(MorphicResult.ErrorResult(WindowsComError.ComException(comException)));
}
return(MorphicResult.OkResult(@interface !));
}
