src/dsp/window.rs

   1 use std::f32::consts;
   2
   3 #[derive(Debug,Clone,Copy,PartialEq)]
   4 pub enum WindowType {
   5     Square,
   6     Sine,
   7     KaiserBessel,
   8 }
   9
  10 pub fn generate_window(mode: WindowType, scale: f32, size: usize, half: bool, dst: &mut [f32]) {
  11     match mode {
  12         WindowType::Square => {
  13                 for n in 0..size { dst[n] = scale; }
  14             },
  15         WindowType::Sine => {
  16                 let param;
  17                 if half {
  18                     param = consts::PI / ((2 * size) as f32);
  19                 } else {
  20                     param = consts::PI / (size as f32);
  21                 }
  22                 for n in 0..size {
  23                     dst[n] = (((n as f32) + 0.5) * param).sin() * scale;
  24                 }
  25             },
  26         WindowType::KaiserBessel => {
  27 unimplemented!();
  28             },
  29     };
  30 }