SessionPoolFilterFunc

This function will be called by the filter.

An implementation should return a value of FilterResult.

When this function returns REMOVE, session will be removed from pool.

A return value of KEEP will leave session untouched in pool.

A value of GST_RTSP_FILTER_REF will add session to the result List of filter.

Parameters:

pool	a SessionPool object
session	a Session in pool
user_data	user data that has been given to filter

Returns:

a FilterResult.