/**
 * Create an incremental RMS meter.
 *
 * Emits one RMS value per complete frame:
 *   rms = sqrt(mean(frame^2))
 * For a steady sine of amplitude g, RMS ≈ g / sqrt(2).
 *
 * @param {Object} [opts]
 * @param {number} [opts.frameSize=2048] - samples per analysis frame
 * @param {number} [opts.hop=512] - samples between successive frames
 * @returns {{
 *   push: (chunk: Float32Array) => number[],
 *   read: () => {current: number|null, frameCount: number, pendingSamples: number},
 *   reset: () => void,
 * }} push() returns the RMS values newly completed by this chunk; read()
 *   reports the most recent value and totals without consuming anything.
 */
export function createRmsMeter({ frameSize, hop }?: {
    frameSize?: number;
    hop?: number;
}): {
    push: (chunk: Float32Array) => number[];
    read: () => {
        current: number | null;
        frameCount: number;
        pendingSamples: number;
    };
    reset: () => void;
};
/**
 * Create an incremental spectral-flux analyzer.
 *
 * Each complete frame is Hann-windowed and transformed (nFft-point FFT);
 * flux is the sum of positive magnitude increases versus the previous
 * frame's spectrum:
 *   flux[t] = sum_k max(0, |X_t[k]| - |X_{t-1}[k]|)
 * The first frame has no predecessor and reports flux 0. Flux spikes at
 * energy/amplitude onsets (e.g. an amplitude step in the input).
 *
 * @param {Object} [opts]
 * @param {number} [opts.nFft=2048] - frame/FFT size in samples
 * @param {number} [opts.hop=512] - samples between successive frames
 * @returns {{
 *   push: (chunk: Float32Array) => number[],
 *   read: () => {current: number|null, frameCount: number, pendingSamples: number},
 *   reset: () => void,
 * }} push() returns the flux values newly completed by this chunk; read()
 *   reports the most recent value and totals without consuming anything.
 */
export function createFluxAnalyzer({ nFft, hop }?: {
    nFft?: number;
    hop?: number;
}): {
    push: (chunk: Float32Array) => number[];
    read: () => {
        current: number | null;
        frameCount: number;
        pendingSamples: number;
    };
    reset: () => void;
};