Struct CeltDecoder 

pub struct CeltDecoder {
    pub config: CeltFrameConfig,
    pub prev_energy: CeltEnergy,
}

CELT frame decoder scaffold.

Provides energy decoding and the MDCT-IV inverse transform. Full entropy-coded CELT decoding (PVQ, fine energy, band prediction …) is provided by crate::opus::celt; this type is intentionally lightweight and intended for testing and scaffolding.

Fields

config: CeltFrameConfig

Frame configuration.

prev_energy: CeltEnergy

Per-band energy state carried across frames.

Implementations

impl CeltDecoder

pub fn new(config: CeltFrameConfig) -> Self

Creates a new CeltDecoder for the given configuration.

pub fn decode_frame(&mut self, data: &[u8]) -> Result<CeltFrame, String>

Parses energy values from the first bytes of data and returns a CeltFrame with zeroed samples.

Each active band contributes one byte to the energy encoding: the byte is interpreted as a signed i8 and scaled by 1/16 to produce a log-domain energy value. Bands beyond the end of data default to 0.0.

Full PVQ coefficient decoding is not performed; this method is a scaffold.

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

Computes the Type-IV MDCT inverse transform (IMDCT-IV).

Given N = coeffs.len() spectral coefficients X[k], the output time-domain samples are:

x[n] = sqrt(2/N) * sum_{k=0}^{N-1} X[k] * cos(π/N * (n + 0.5 + N/2) * (k + 0.5))

for n = 0 .. N-1.

Returns an empty vector if coeffs is empty.

Trait Implementations

impl Debug for CeltDecoder

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

Formats the value using the given formatter.