|Microsoft DirectX 9.0|
The BlockOutputPin method blocks the pin. While the pin is blocked, the CDynamicOutputPin::StartUsingOutputPin method waits for the pin to become unblocked. The blocked state prevents the output pin from delivering samples, changing its output format, or reconnecting itself.
Before calling this method, hold the CDynamicOutputPin::m_BlockStateLock critical section. Do not call this method if a streaming thread is using the pin, either to deliver data or to change the connection. To check whether a streaming thread is using the pin, call the CDynamicOutputPin::StreamingThreadUsingOutputPin method.