import type { MoviWasmModule } from "../wasm/types";
/**
 * Ensure the movi WASM module is loaded. Single-flight, shared with the
 * FFmpeg pipeline. Returns null if loading fails so the caller can fall back
 * to a different stretcher.
 */
export declare function loadSignalsmith(): Promise<MoviWasmModule | null>;
/**
 * SoundTouch-shaped facade around movi's Signalsmith Stretch API.
 * Stereo only — AudioRenderer always upmixes to interleaved 2-channel before
 * calling, matching the SoundTouch / Rubberband paths.
 */
export declare class SignalsmithStretcher {
    private mod;
    private handle;
    private channels;
    private inPtr;
    private outPtr;
    private inCapacityFrames;
    private outCapacityFrames;
    private pendingInput;
    private pendingInputFrames;
    private lastOutputFrames;
    private _tempo;
    private _pitch;
    readonly inputBuffer: {
        putSamples: (samples: Float32Array, position?: number, numFrames?: number) => void;
    };
    readonly outputBuffer: {
        readonly frameCount: number;
        receiveSamples: (output: Float32Array, numFrames: number) => void;
    };
    constructor(mod: MoviWasmModule, sampleRate: number, channels?: number);
    set tempo(t: number);
    get tempo(): number;
    set pitch(p: number);
    get pitch(): number;
    /**
     * SoundTouch's `process()` is a no-op trigger. We defer the actual WASM
     * call to receiveSamples() so we know the requested output size, which
     * Signalsmith needs upfront (it doesn't auto-buffer like SoundTouch).
     * Setting lastOutputFrames here gives the caller's frameCount check the
     * correct value before they call receiveSamples.
     */
    process(): void;
    clear(): void;
    destroy(): void;
    private stashInput;
    /**
     * Lazily allocate / regrow a WASM heap buffer for `frames * channels`
     * float samples. Returns the pointer.
     */
    private ensureBuffer;
    private runProcessIfNeeded;
}
/**
 * Convenience: load the WASM module + construct a stretcher in one call.
 */
export declare function createSignalsmithStretcher(sampleRate: number, channels?: number): Promise<SignalsmithStretcher | null>;
//# sourceMappingURL=signalsmith.d.ts.map