Struct chfft::Mdct1D
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pub struct Mdct1D<T, F: Fn(usize, usize) -> T> { /* fields omitted */ }
Perform a Modified discrete cosine transform
Example
extern crate chfft; use chfft::Mdct1D; fn main() { let input = [2.0 as f64, 0.0, 1.0, 1.0, 0.0, 3.0, 2.0, 4.0]; let mut mdct = Mdct1D::with_sine(input.len()); let output = mdct.forward(&input); println!("the transform of {:?} is {:?}", input, output); }
Methods
impl<T: Float + FloatConst + NumAssign> Mdct1D<T, fn(_: usize, _: usize) -> T>
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pub fn with_sine(len: usize) -> Self
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Returns a instances to execute DCT with sine window
use chfft::Mdct1D; let mut mdct = Mdct1D::<f64, _>::with_sine(1024);
pub fn with_vorbis(len: usize) -> Self
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Returns a instances to execute DCT with vorbis window
use chfft::Mdct1D; let mut mdct = Mdct1D::<f64, _>::with_vorbis(1024);
impl<T: Float + FloatConst + NumAssign, F: Fn(usize, usize) -> T> Mdct1D<T, F>
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pub fn new(window_func: F, len: usize) -> Self
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Returns a instances to execute DCT
extern crate chfft; let mut mdct = chfft::Mdct1D::new(|l, p| (std::f64::consts::PI * (p as f64 + 0.5) / l as f64).sin(), 1024);
pub fn setup(&mut self, len: usize)
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Reinitialize length
use chfft::Mdct1D; let mut mdct = Mdct1D::<f64, _>::with_sine(1024); // reinitialize mdct.setup(2048);
pub fn forward(&mut self, source: &[T]) -> Vec<T>
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The 1 scaling factor forward transform
extern crate chfft; let input = [2.0 as f64, 0.0, 1.0, 1.0, 0.0, 3.0, 2.0, 4.0]; let mut mdct = chfft::Mdct1D::with_sine(input.len()); let output = mdct.forward(&input);
pub fn backward(&mut self, source: &[T]) -> Vec<T>
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The 1 scaling factor backward transform
extern crate chfft; let input = [2.0 as f64, 0.0, 1.0, 1.0, 0.0, 3.0, 2.0, 4.0]; let mut mdct = chfft::Mdct1D::with_sine(input.len() << 1); let output = mdct.backward(&input);
pub fn forwardu(&mut self, source: &[T]) -> Vec<T>
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The \(\sqrt{\frac 2 n}\) scaling factor forward transform
extern crate chfft; let input = [2.0 as f64, 0.0, 1.0, 1.0, 0.0, 3.0, 2.0, 4.0]; let mut mdct = chfft::Mdct1D::with_sine(input.len()); let output = mdct.forward(&input);
pub fn backwardu(&mut self, source: &[T]) -> Vec<T>
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The \(\sqrt{\frac 2 n}\) scaling factor backward transform
extern crate chfft; let input = [2.0 as f64, 0.0, 1.0, 1.0, 0.0, 3.0, 2.0, 4.0]; let mut mdct = chfft::Mdct1D::with_sine(input.len() << 1); let output = mdct.backward(&input);