/** Non-interleaved PCM audio. Every channel must contain the same number of frames. */
export interface AudioData {
    readonly sampleRate: number;
    readonly channels: Float32Array[];
}
export type QualityPreset = "fast" | "balanced" | "high";
/** Named Signalsmith controls. Frequencies are expressed in Hz at the public API. */
export interface AdvancedSignalsmithOptions {
    /** Upper frequency where pitch mapping preserves more tonality. Zero disables the limit. */
    readonly tonalityLimitHz?: number;
    /** Independent formant shift. Cannot be combined with formantScale. */
    readonly formantSemitones?: number;
    /** Independent formant multiplier. Cannot be combined with formantSemitones. */
    readonly formantScale?: number;
    /** Compensate the formants for the configured pitch shift. */
    readonly formantCompensation?: boolean;
    /** Approximate fundamental frequency used for formant analysis. Zero enables detection. */
    readonly formantBaseHz?: number;
}
export interface ProcessOptions extends AudioData {
    /** Output duration divided by input duration. Greater than one is slower/longer. */
    readonly timeRatio?: number;
    /** Pitch multiplier. Two is one octave up; 0.5 is one octave down. */
    readonly pitchScale?: number;
    /** Friendly alternative to pitchScale. Cannot be specified together with pitchScale. */
    readonly pitchSemitones?: number;
    readonly quality?: QualityPreset;
    readonly advanced?: AdvancedSignalsmithOptions;
}
export interface StreamProcessorOptions {
    readonly sampleRate: number;
    readonly channels: number;
    readonly timeRatio?: number;
    readonly pitchScale?: number;
    readonly pitchSemitones?: number;
    readonly quality?: QualityPreset;
    readonly advanced?: AdvancedSignalsmithOptions;
    readonly maxBlockSize?: number;
}
export interface SignalsmithStretchStreamProcessor {
    process(channels: Float32Array[]): Float32Array[];
    flush(): Float32Array[];
    setTimeRatio(value: number): void;
    setPitchScale(value: number): void;
    setPitchSemitones(value: number): void;
    reset(): void;
    dispose(): void;
    readonly latencyFrames: number;
    readonly disposed: boolean;
}
export interface SignalsmithStretch {
    process(options: ProcessOptions): Promise<AudioData>;
    createStreamProcessor(options: StreamProcessorOptions): Promise<SignalsmithStretchStreamProcessor>;
    dispose(): void;
    readonly disposed: boolean;
    readonly version: string;
}
export interface CreateSignalsmithStretchOptions {
    readonly wasmUrl?: string | URL;
    readonly locateFile?: (path: string) => string;
}
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