export interface AudioVisualizationData {
    frequency: Uint8Array;
    waveform: Uint8Array;
}
export type AudioDataCallback = (data: AudioVisualizationData) => void;
export interface IAudioNoiseSuppressionProvider {
    createNode(context: AudioContext): Promise<AudioNode> | AudioNode;
    destroy?(): void;
}
export interface IAudioProcessingPipeline {
    isRunning(): boolean;
    start(track: MediaStreamTrack): Promise<void>;
    stop(): void;
    getOutputTrack(): MediaStreamTrack | null;
    setGain(value: number): void;
    getGain(): number;
    getFrequencyData(): Uint8Array;
    getWaveformData(): Uint8Array;
    onAudioData(cb: AudioDataCallback): VoidFunction;
    setNoiseSuppressionProvider(provider: IAudioNoiseSuppressionProvider | null): Promise<void>;
}
export declare class AudioProcessingPipelineService implements IAudioProcessingPipeline {
    private context;
    private source;
    private gainNode;
    private analyser;
    private destination;
    private mlNode;
    private inputTrack;
    private running;
    private gainValue;
    private provider;
    private frequencyData;
    private waveformData;
    private audioDataCallbacks;
    private rafId;
    isRunning(): boolean;
    start(track: MediaStreamTrack): Promise<void>;
    stop(): void;
    destroy(): void;
    getOutputTrack(): MediaStreamTrack | null;
    setGain(value: number): void;
    getGain(): number;
    getFrequencyData(): Uint8Array;
    getWaveformData(): Uint8Array;
    onAudioData(cb: AudioDataCallback): VoidFunction;
    setNoiseSuppressionProvider(provider: IAudioNoiseSuppressionProvider | null): Promise<void>;
    private createProviderNode;
    private connectGraph;
    private disconnectGraph;
    private startAnalysisLoop;
}