import { DuplicateDisposeAction, EnhancedDisposable, type EventRegister } from '@idlebox/common';
interface IRecorder {
    onDataAvailable: EventRegister<Uint8Array<ArrayBuffer>>;
    onFinished: EventRegister<void>;
    dispose(): void;
}
/**
 * TODO: 新api要求使用webworker 这里模拟worker
 */
export declare class RawPcmStreamNode extends EnhancedDisposable implements IRecorder {
    private readonly audioContext;
    private readonly bitDepth;
    private readonly latency;
    protected duplicateDispose: DuplicateDisposeAction;
    private readonly _onDataAvailable;
    readonly onDataAvailable: EventRegister<Uint8Array<ArrayBuffer>>;
    /**
     * 由于AudioNode没有类似end的事件，只能用延迟模拟一个
     */
    private readonly _onFinished;
    readonly onFinished: EventRegister<void>;
    /**
     * 被要求结束后，只有连续没有收到音频，才真正触发 onFinished
     * 这和决定录音何时结束无关
     */
    private readonly willFinish;
    private _node?;
    constructor(audioContext: AudioContext, bitDepth?: number, latency?: number);
    get bufferSize(): number;
    private _getNode;
    connectFrom(source: AudioNode): void;
    /**
     * 外部不要调用
     *
     * 优雅结束
     * @private
     */
    shutdown(): void;
}
export declare class RawPcmStreamRecorder extends EnhancedDisposable {
    readonly bitDepth: number;
    readonly sampleRate: number;
    protected duplicateDispose: DuplicateDisposeAction;
    private readonly channels;
    private readonly dfd;
    constructor(bitDepth?: number, sampleRate?: number);
    get context(): AudioContext;
    private started?;
    /**
     * 开始录音（可以重复调用，返回相同）
     * stop之后不能重新start
     */
    startRecording(latency?: number): Promise<IRecorder>;
    private _microphone?;
    private _analyze?;
    private _recorder?;
    _startRecording(latency: number): Promise<RawPcmStreamNode>;
    private caclculateVolume;
    getPromise(): Promise<void> & import("@idlebox/common").IProgressHolder<void, any>;
    private hasClosed;
    private close_microphone;
    stopRecording(): Promise<void>;
}
export {};
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