fn output(&mut self, dst: &mut [f32], off0: usize, off1: usize, chno: usize) {
match self.transform {
Transform::DCT(ref mut dct) => {
fn output(&mut self, dst: &mut [f32], off0: usize, off1: usize, chno: usize) {
match self.transform {
Transform::DCT(ref mut dct) => {