private object GetPropertyValue(IPropertyStore propertyStore, PROPERTYKEY propertyKey)
{
object returnObj = null;
PROPVARIANT propVariant;
var result = propertyStore.GetValue(ref propertyKey, out propVariant);
AssertCoreAudio.IsHResultOk(result);
var vType = (VarEnum)propVariant.vt;
if (vType == VarEnum.VT_EMPTY)
return null;
switch (vType)
{
case VarEnum.VT_BOOL:
returnObj = propVariant.Data.AsBoolean;
break;
case VarEnum.VT_UI4:
returnObj = propVariant.Data.AsUInt32;
break;
case VarEnum.VT_LPWSTR:
case VarEnum.VT_CLSID:
returnObj = Marshal.PtrToStringUni(propVariant.Data.AsStringPtr);
break;
case VarEnum.VT_BLOB:
returnObj = propVariant.Data.AsFormatPtr;
break;
}
if (propertyKey.fmtid == PropertyKeys.PKEY_AudioEngine_DeviceFormat ||
propertyKey.fmtid == PropertyKeys.PKEY_AudioEngine_OEMFormat)
{
Assert.AreEqual(VarEnum.VT_BLOB, vType, "The device format property was not of varient type VT_BLOB.");
var format = (WAVEFORMATEX)Marshal.PtrToStructure((IntPtr)returnObj, typeof(WAVEFORMATEX));
if (format.nChannels != 0 && format.nSamplesPerSec != 0 && format.wBitsPerSample != 0)
Assert.AreEqual(format.nChannels * format.nSamplesPerSec * format.wBitsPerSample, format.nAvgBytesPerSec * 8, "The wave format was not valid.");
}
return returnObj;
}
internal void SetExpected(EDataFlow dataflow, ERole role, string deviceId, int newState, PROPERTYKEY propertyKey)
{
_dataFlow = dataflow;
_role = role;
_deviceId = deviceId;
_newState = newState;
_propertyKey = propertyKey;
}
/// <summary>
/// Verifies the returned property key is valid.
/// </summary>
/// <param name="propertyKey">The property key.</param>
public static void IsPropertyKeyValid(PROPERTYKEY propertyKey)
{
Assert.IsNotNull(propertyKey, "The property key is null.");
Assert.AreNotEqual(Guid.Empty, propertyKey.fmtid, "The property key format ID is not valid.");
Assert.AreNotEqual(0, propertyKey.pid, "The property key property ID is not valid.");
}
public void OnPropertyValueChanged(string deviceId, PROPERTYKEY propertyKey)
{
Assert.AreEqual(_deviceId, deviceId);
Assert.AreEqual(_propertyKey, propertyKey);
}
