export type MediaCaptureResult = {
    stream: MediaStream;
    sourceStreams: MediaStream[];
    cleanupContext?: AudioContext;
};
export declare function getMediaStream(deviceId?: string, virtualMode?: boolean, debug_displayAudio?: boolean): Promise<MediaCaptureResult>;
export declare function createAudioAnalyzer(mediaStream: MediaStream): {
    audioContext: AudioContext;
    analyser: AnalyserNode;
};
export declare function calculateAudioLevel(analyser: AnalyserNode): number;