import type { RateTransposerInterpolationStrategy, SampleBufferType, StretchParameters } from '@soundtouchjs/core';
/**
 * Options for offline rendering with `FormantCorrectionNode`.
 */
export interface ProcessOfflineOptions {
    /** Source audio buffer to process. */
    input: AudioBuffer;
    /** URL or path to the formant-correction processor script. */
    processorUrl: string | URL;
    /** Pitch multiplier (1.0 = original pitch). */
    pitch?: number;
    /** Pitch shift in semitones, combined with `pitch`. */
    pitchSemitones?: number;
    /** Playback rate multiplier. Output length is scaled by `1 / playbackRate`. */
    playbackRate?: number;
    /** Formant correction strength (`0` raw, `1` full correction). */
    formantStrength?: number;
    /** Interpolation strategy for the internal rate transposer. */
    interpolationStrategy?: RateTransposerInterpolationStrategy;
    /** WSOLA timing parameters for the SoundTouch stretch stage. */
    stretchParameters?: StretchParameters;
    /** Internal sample buffer strategy. */
    sampleBufferType?: SampleBufferType;
}
/**
 * Renders an `AudioBuffer` through `FormantCorrectionNode` in an `OfflineAudioContext`.
 *
 * @param options Offline processing options.
 * @returns The rendered output `AudioBuffer`.
 */
export declare function processOffline(options: ProcessOfflineOptions): Promise<AudioBuffer>;
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