Struct FftAnalyzer 

pub struct FftAnalyzer {
    pub magnitudes: Vec<f32>,
    pub smoothed: Vec<f32>,
    /* private fields */
}

Holds the rolling sample buffer and performs FFT analysis.

Fields

magnitudes: Vec<f32>

Latest magnitude spectrum (fft_size/2 bins).

smoothed: Vec<f32>

Smoothed magnitudes for visuals.

Implementations

impl FftAnalyzer

pub fn new(fft_size: usize, sample_rate: u32) -> Self

Create an analyser with the given FFT window size and sample rate. Typical sizes: 512, 1024, 2048, 4096.

pub fn set_window(&mut self, w: Window)

pub fn push_samples(&mut self, samples: &[f32])

Push new audio samples (mono f32). Keeps a rolling window.

pub fn freq_bands(&self, bands: usize) -> Vec<f32>

Return bands logarithmically-spaced frequency magnitudes. Index 0 = bass, index bands-1 = treble.

pub fn dominant_freq(&self) -> f32

Dominant frequency in Hz (peak of magnitude spectrum).

pub fn rms(&self) -> f32

RMS level of the current window.

pub fn is_beat(&self) -> bool

Beat detection: true if current frame energy significantly exceeds average.

pub fn beat_ratio(&self) -> f32

Beat energy ratio (1.0 = at threshold, >1 = strong beat).