Managers are elements that add a function or unify the function of
another (series of) element(s). Managers are generally a
GstBin with one or more ghostpads. Inside them
is/are the actual element(s) that matters. There is several cases where
this is useful. For example:
To add support for private events with custom event handling to another element.
To add support for custom pad
_convert () handling to another element.
To add custom data handling before or after another element's data
handler function (generally its
To embed an element, or a series of elements, into something that looks and works like a simple element to the outside world. This is particular handy for implementing sources and sink elements with multiple pads.
Making a manager is about as simple as it gets. You can derive from a
GstBin, and in most cases, you can embed the
required elements in the
_init () already, including
setup of ghostpads. If you need any custom data handlers, you can connect
signals or embed a second element which you control.