Struct SilkDecoder 

pub struct SilkDecoder {
    pub bandwidth: SilkBandwidth,
    pub frame_size: usize,
    pub prev_samples: Vec<i16>,
}

SILK frame decoder scaffold.

This type parses the SILK frame header and exposes helpers for LPC synthesis. Full entropy-coded SILK decoding is extremely complex and is provided by the Opus implementation in crate::opus::silk. This struct is intentionally lightweight and suitable for testing and scaffolding.

Fields

bandwidth: SilkBandwidth

Operating bandwidth.

frame_size: usize

Expected frame size in samples.

prev_samples: Vec<i16>

Previous output samples kept for LPC synthesis state (history).

Implementations

impl SilkDecoder

pub fn new(bandwidth: SilkBandwidth) -> Self

Creates a new SilkDecoder for the given bandwidth.

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

Parses the frame header and returns a SilkFrame with zeroed samples.

Full SILK decoding (excitation decoding, LTP, noise shaping …) is not implemented here; the goal of this method is to validate the header and set up the frame scaffold so that higher-level code can fill in the decoded samples.

pub fn apply_lpc_synthesis( &mut self, excitation: &[i16], lpc: &SilkLpcCoeffs, ) -> Vec<i16>

Applies the LPC synthesis filter to an excitation signal.

The synthesis filter is:

s[n] = excitation[n] + sum_{k=0}^{order-1} (lpc.coeffs[k] * s[n-k-1]) / 4096

where the division by 4096 converts Q12 fixed-point coefficients back to the integer domain.

The decoder’s prev_samples buffer is used as the initial state and is updated to the last order samples of the output on return.

Trait Implementations

impl Debug for SilkDecoder

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

Formats the value using the given formatter.