IVMRMixerControl::GetAlpha
| Microsoft DirectShow 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. |
Requirements
Header: Declared in Strmif.h; include Dshow.h.
Library: Use Strmiids.lib.
See Also