[ NoWrapper ]
[ Version ( since = "1.20" ) ]
public virtual void prepare_frame_start (Aggregator videoaggregator, Buffer buffer, Frame prepared_frame)
Begin preparing the frame from the pad buffer and sets it to prepared_frame.
If overriden, `prepare_frame_finish` must also be overriden.
| this |
the AggregatorPad |
| videoaggregator |
the parent Aggregator |
| buffer |
the input Buffer to prepare |
| prepared_frame |
the Frame to prepare into |