Get the buffer reference a given data plane is stored in.
@param plane index of the data plane of interest in frame->extended_data.
@return the buffer reference that contains the plane or NULL if the input frame is not valid.
See Implementation
Get the buffer reference a given data plane is stored in.
@param plane index of the data plane of interest in frame->extended_data.
@return the buffer reference that contains the plane or NULL if the input frame is not valid.