import { SoundStateChangeHandler } from './sound-detector';
export declare class RNSpeechDetector {
    private readonly pc1;
    private readonly pc2;
    private audioStream;
    private externalAudioStream;
    private isStopped;
    constructor(externalAudioStream?: MediaStream);
    /**
     * Starts the speech detection.
     */
    start(onSoundDetectedStateChanged: SoundStateChangeHandler): Promise<() => void>;
    /**
     * Stops the speech detection and releases all allocated resources.
     */
    private stop;
    /**
     * Public method that detects the audio levels and returns the status.
     */
    private onSpeakingDetectedStateChange;
    private cleanupAudioStream;
    private forwardIceCandidate;
}