Struct Preprocessor 

pub struct Preprocessor { /* private fields */ }

Audio preprocessor that applies configured processing stages.

Each instance maintains its own filter state, so you should create one Preprocessor per audio stream (or per VAD config in vad-lab).

Processing Order

1. High-pass filter (removes low-frequency noise)
2. Noise suppression (RNNoise, resamples internally if not 48kHz)
3. Normalization (RMS-based amplitude adjustment)

Implementations

impl Preprocessor

pub fn new(config: &PreprocessorConfig, sample_rate: u32) -> Self

Create a new preprocessor with the given configuration.

Arguments

• config - Preprocessing configuration
• sample_rate - Audio sample rate in Hz

pub fn sample_rate(&self) -> u32

Returns the sample rate this preprocessor was configured for.

pub fn is_enabled(&self) -> bool

Returns true if any preprocessing stages are enabled.

pub fn is_denoising(&self) -> bool

Returns true if noise suppression is active.

pub fn is_normalizing(&self) -> bool

Returns true if normalization is active.

pub fn process(&mut self, samples: &[i16]) -> Vec<i16>

Process audio samples and return the preprocessed result.

Returns a new Vec<i16> with the processed samples. If no preprocessing is enabled, returns a clone of the input.

pub fn reset(&mut self)

Reset all filter states.

Call this when starting a new audio stream or after a long pause.

Trait Implementations

impl Debug for Preprocessor

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

Formats the value using the given formatter.