import { Promise } from "../../common/Exports";
import { AudioStreamFormat } from "../Exports";
export declare const bufferSize: number;
/**
 * Represents audio input stream used for custom audio input configurations.
 * @class AudioInputStream
 */
export declare abstract class AudioOutputStream {
    /**
     * Creates and initializes an instance.
     * @constructor
     */
    protected constructor();
    /**
     * Creates a memory backed PullAudioOutputStream with the specified audio format.
     * @member AudioInputStream.createPullStream
     * @function
     * @public
     * @param {AudioStreamFormat} format - The audio data format in which audio will be
     *        written to the push audio stream's write() method (currently only support 16 kHz 16bit mono PCM).
     * @returns {PullAudioOutputStream} The audio input stream being created.
     */
    static createPullStream(format?: AudioStreamFormat): PullAudioOutputStream;
    /**
     * Explicitly frees any external resource attached to the object
     * @member AudioInputStream.prototype.close
     * @function
     * @public
     */
    abstract close(): void;
}
/**
 * Represents memory backed push audio input stream used for custom audio input configurations.
 * @class PullAudioOutputStream
 */
export declare abstract class PullAudioOutputStream extends AudioOutputStream {
    /**
     * Creates a memory backed PullAudioOutputStream with the specified audio format.
     * @member PullAudioOutputStream.create
     * @function
     * @public
     * @param {AudioStreamFormat} format - The audio data format in which audio will be written to the
     *        push audio stream's write() method (currently only support 16 kHz 16bit mono PCM).
     * @returns {PullAudioOutputStream} The push audio input stream being created.
     */
    static create(format?: AudioStreamFormat): PullAudioOutputStream;
    /**
     * Reads audio data from the internal buffer.
     * @member PullAudioOutputStream.prototype.read
     * @function
     * @public
     * @returns {Promise<ArrayBuffer>} Audio buffer data.
     */
    abstract read(): Promise<ArrayBuffer>;
    /**
     * Closes the stream.
     * @member PullAudioOutputStream.prototype.close
     * @function
     * @public
     */
    abstract close(): void;
}
/**
 * Represents memory backed push audio input stream used for custom audio input configurations.
 * @private
 * @class PullAudioOutputStreamImpl
 */
export declare class PullAudioOutputStreamImpl extends PullAudioOutputStream {
    private privFormat;
    private privId;
    private privStream;
    private streamReader;
    /**
     * Creates and initalizes an instance with the given values.
     * @constructor
     * @param {AudioStreamFormat} format - The audio stream format.
     */
    constructor(chunkSize: number, format?: AudioStreamFormat);
    /**
     * Format information for the audio
     */
    readonly format: AudioStreamFormat;
    /**
     * Checks if the stream is closed
     * @member PullAudioOutputStreamImpl.prototype.isClosed
     * @property
     * @public
     */
    readonly isClosed: boolean;
    /**
     * Gets the id of the stream
     * @member PullAudioOutputStreamImpl.prototype.id
     * @property
     * @public
     */
    readonly id: string;
    /**
     * Reads data from the buffer
     * @member PullAudioOutputStreamImpl.prototype.read
     * @function
     * @public
     * @param {ArrayBuffer} dataBuffer - The audio buffer of which this function will make a copy.
     */
    read(): Promise<ArrayBuffer>;
    /**
     * Writes the audio data specified by making an internal copy of the data.
     * @member PullAudioOutputStreamImpl.prototype.write
     * @function
     * @public
     * @param {ArrayBuffer} dataBuffer - The audio buffer of which this function will make a copy.
     */
    write(dataBuffer: ArrayBuffer): void;
    /**
     * Closes the stream.
     * @member PullAudioOutputStreamImpl.prototype.close
     * @function
     * @public
     */
    close(): void;
}