/*
 * call-seq:
 *   new "name" [, inputs] [, AudioPort|VideoPort|PostPort...] -> object
 *
 * Initializes the post plugin with the given name and connects its
 * outputs to given VideoPort, AudioPort or PostPort instances. Some plugins
 * also care about the number of inputs you request (e.g. mixer plugins), with
 * other plugins this number can be omitted.
 */
static VALUE p_new(int argc, VALUE *argv, VALUE class) {