Microsoft DirectX 9.0

IVMRMixerControl::GetAlpha

The GetAlpha method retrieves the constant alpha value that is applied to this video stream.

Syntax

HRESULT GetAlpha(
  DWORD dwStreamID,
  float*  pAlpha
);

Parameters

dwStreamID

[in] Specifies the input stream.

pAlpha

[out]  Pointer to a variable of type float that receives the current alpha value.

Return Values

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

Error Code Description
E_POINTER pAlpha is invalid.
VFW_E_NOT_CONNECTED The pin is not connected.

See Also