public static IList <AudioDevice> RequestAllDevices()
{
List <AudioDevice> list = new List <AudioDevice>();
NativeMethods.IMMDeviceEnumerator deviceEnumerator = null;
deviceEnumerator = (NativeMethods.IMMDeviceEnumerator)(new NativeMethods.MMDeviceEnumerator());
if (deviceEnumerator == null)
{
return(list);
}
NativeMethods.IMMDeviceCollection collection;
Marshal.ThrowExceptionForHR(deviceEnumerator.EnumAudioEndpoints(NativeMethods.EDataFlow.eRender, NativeMethods.DEVICE_STATE.MASK_ALL, out collection));
if (collection == null)
{
return(list);
}
int count;
Marshal.ThrowExceptionForHR(collection.GetCount(out count));
for (int i = 0; i < count; i++)
{
NativeMethods.IMMDevice dev;
Marshal.ThrowExceptionForHR(collection.Item(i, out dev));
if (dev != null)
{
list.Add(CreateDevice(dev));
}
}
return(list);
}
private static NativeMethods.IMMDevice GetDefaultSpeakers()
{
// get the speakers (1st render + multimedia) device
NativeMethods.IMMDeviceEnumerator deviceEnumerator = (NativeMethods.IMMDeviceEnumerator)(new NativeMethods.MMDeviceEnumerator());
NativeMethods.IMMDevice speakers;
int errorCode = deviceEnumerator.GetDefaultAudioEndpoint(NativeMethods.EDataFlow.eRender, NativeMethods.ERole.eMultimedia, out speakers);
Debug.Assert(errorCode == 0, "Error obtaining information from windows API - error code: " + errorCode);
return(speakers);
}
public static IList <AudioSession> RequestAllSessions(AudioDevice device)
{
if (device == null)
{
throw new ArgumentNullException(nameof(device));
}
List <AudioSession> list = new List <AudioSession>();
NativeMethods.IMMDeviceEnumerator deviceEnumerator = (NativeMethods.IMMDeviceEnumerator)(new NativeMethods.MMDeviceEnumerator());
NativeMethods.IMMDevice immDevice;
Marshal.ThrowExceptionForHR(deviceEnumerator.GetDevice(device.Id, out immDevice));
Debug.Assert(immDevice != null, "Unable to retrieve IMMDevice with EnumeratorName of AudioDevice");
NativeMethods.IAudioSessionManager2 mgr = GetAudioSessionManager(immDevice);
if (mgr == null)
{
return(list);
}
NativeMethods.IAudioSessionEnumerator sessionEnumerator;
Marshal.ThrowExceptionForHR(mgr.GetSessionEnumerator(out sessionEnumerator));
int count;
Marshal.ThrowExceptionForHR(sessionEnumerator.GetCount(out count));
for (int i = 0; i < count; i++)
{
NativeMethods.IAudioSessionControl ctl;
Marshal.ThrowExceptionForHR(sessionEnumerator.GetSession(i, out ctl));
if (ctl == null)
{
continue;
}
NativeMethods.IAudioSessionControl2 ctl2 = ctl as NativeMethods.IAudioSessionControl2;
NativeMethods.ISimpleAudioVolume sav = ctl as NativeMethods.ISimpleAudioVolume;
if (ctl2 != null && sav != null)
{
list.Add(new AudioSession(ctl2, sav));
}
}
Marshal.ReleaseComObject(sessionEnumerator);
Marshal.ReleaseComObject(mgr);
return(list);
}
