/**
 * A handle on a session's outgoing audio that lets you push raw PCM audio,
 * interrupt the agent, check whether it is speaking, and observe when the last
 * audio byte has played. Constructed against a session, to whose events it
 * subscribes.
 *
 * Note: {@link AudioTrack.pause}, {@link AudioTrack.resume}, and
 * {@link AudioTrack.markSynthesisComplete} have no runtime effect in this SDK and
 * are kept for API compatibility.
 */
/**
 * Callback invoked when the last audio byte of a response has played.
 * @param durationSeconds Duration in seconds of the audio that just finished.
 */
export type LastAudioByteCallback = (durationSeconds: number) => void | Promise<void>;
/** See the module-level description for usage. */
export declare class AudioTrack {
    protected _session: any;
    protected _sampleRate: number;
    protected _lastAudioByteCallback: LastAudioByteCallback | null;
    /**
     * @param session The session this track sends audio to and listens on.
     * @param sampleRate Sample rate of pushed PCM audio, in Hz. Default: `48000`.
     */
    constructor(session: any, sampleRate?: number);
    /** Sample rate of pushed PCM audio, in Hz. */
    get sampleRate(): number;
    /** Whether the agent is currently speaking. */
    get isSpeaking(): boolean;
    /** Whether the active TTS provider supports pausing playback. */
    get canPause(): boolean;
    /**
     * Push a chunk of raw PCM audio to the session's outgoing audio.
     * @param pcm Raw PCM samples.
     * @param sampleRate Sample rate of `pcm` in Hz; defaults to {@link sampleRate}.
     */
    addNewBytes(pcm: Uint8Array, sampleRate?: number | null): Promise<void>;
    /** Interrupt the agent, cancelling any in-progress generation. */
    interrupt(): Promise<void>;
    /** No-op in this SDK; retained for API compatibility. */
    pause(): Promise<void>;
    /** No-op in this SDK; retained for API compatibility. */
    resume(): Promise<void>;
    /** No-op in this SDK; retained for API compatibility. */
    markSynthesisComplete(): void;
    /** Register a callback fired when the last audio byte of a response has played. */
    onLastAudioByte(callback: LastAudioByteCallback): void;
    protected _onLastAudioByte(payload: Record<string, any>): void;
}