|Microsoft DirectX 9.0|
The SynchronousBlockOutputPin method blocks the pin; does not return until the pin is blocked.
Returns an HRESULT value. Possible values include those shown in the following table.
|VFW_E_PIN_ALREADY_BLOCKED||Pin is already blocked on another thread.|
|VFW_E_PIN_ALREADY_BLOCKED_ON_THIS_THREAD||Pin is already blocked on the calling thread.|
Do not call this method from the streaming thread.