Subclasses can override any of the available virtual methods or not, as needed. At minimum handle_frame needs to be overridden, and set_format and get_caps are likely needed as well.
handle_frame
set_format
get_caps
Subclasses can override any of the available virtual methods or not, as needed. At minimum
handle_frameneeds to be overridden, andset_formatandget_capsare likely needed as well.