Overview of NSAPI Functions for Filter Development

NSAPI provides a set of C functions that are used to implement SAFs and filters. All of the public routines are described in detail in Chapter 6, NSAPI Function and Macro Reference.

The NSAPI functions specific to the development of filters are:

• filter_create() creates a new filter

• filter_insert() inserts the specified filter into a filter stack

• filter_remove() removes the specified filter from a filter stack

• filter_name() returns the name of the specified filter

• filter_find() finds an existing filter given a filter name

• filter_layer() returns the layer in a filter stack that corresponds to the specified filter