Struct Mdct 

pub struct Mdct { /* private fields */ }

MDCT processor with pre-computed windows and FFT plans

Provides O(N log N) MDCT/IMDCT transforms using FFT acceleration.

Implementations

impl Mdct

pub fn new(channels: usize, window_type: WindowType) -> Self

Create a new MDCT processor

pub fn sine_window(n: usize) -> Vec<f32>

Sine window: w[n] = sin(π(n+0.5)/N)

pub fn vorbis_window(n: usize) -> Vec<f32>

Vorbis window: sin(π/2 * sin²(π(n+0.5)/N))

pub fn forward(&self, samples: &[f32], block_size: BlockSize) -> Vec<f32>

Forward MDCT: N time samples → N/2 frequency coefficients

X[k] = Σ x[n] * w[n] * cos(π/N * (n + 0.5 + N/2) * (k + 0.5))

pub fn inverse(&self, coeffs: &[f32], block_size: BlockSize) -> Vec<f32>

Inverse MDCT: N/2 frequency coefficients → N time samples

y[n] = 2/N * Σ(k=0 to N-1) X[k] * cos(π/N * (n + 0.5 + N/2) * (k + 0.5))

pub fn process_frame( &mut self, samples: &[f32], channel: usize, block_size: BlockSize, ) -> (Vec<f32>, Vec<f32>)

Process a frame with overlap-add for perfect reconstruction Returns N/2 output samples (the middle half after overlap-add)

pub fn reset(&mut self)

Reset overlap buffers (e.g., for seeking)

pub fn analyze( &mut self, samples: &[f32], block_size: BlockSize, ) -> Vec<Vec<f32>>

Encode samples to MDCT coefficients for all channels Input: interleaved samples [L, R, L, R, …] Output: MDCT coefficients per channel

pub fn synthesize( &mut self, coeffs: &[Vec<f32>], block_size: BlockSize, ) -> Vec<f32>

Synthesize samples from MDCT coefficients with overlap-add Input: MDCT coefficients per channel Output: interleaved samples