Struct Interpolator 

pub struct Interpolator { /* private fields */ }

The band-limited interpolation a clip played at another speed reads its source through: the same Kaiser-windowed sinc as Resampler (16 taps a side at unity, cutoff 0.97 of the Nyquist frequency, beta 9), at any real source position. Played faster than unity, the cutoff falls to the output’s Nyquist frequency and the filter widens in proportion, as a falling rate does, so what the speed raises past the output’s Nyquist frequency is removed rather than folded back. Slower, the source’s Nyquist frequency bounds it, so no image of the source’s spectrum is heard.

Every weight comes from one table computed with libm’s portable functions, interpolated linearly, and every sum runs in one fixed order, so the same samples give bit-identical output natively and in wasm.

Implementations

impl Interpolator

pub fn new(speed: f64) -> Self

The filter for a clip playing speed source samples per output sample. A speed that is not a positive finite number takes the unity filter.

pub const fn half_taps(&self) -> i64

Source samples on each side of a position that it weighs: an output at whole + fraction reads source samples whole - half + 1 ..= whole + half.

pub fn weights(&self, fraction: f64, weights: &mut Vec<f64>)

Writes into weights the 2 * half weights, summing to one, of source samples whole - half + 1 ..= whole + half for a position fraction (in 0..1) past source sample whole.

Trait Implementations

impl Clone for Interpolator

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Interpolator

impl Debug for Interpolator

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.