import { Filter, FilterStreamRef } from '../../../Filter';
import { Stream } from '../../../Compiler';
/**
  * 9.8 sine
  * Generate an audio signal made of a sine wave with amplitude 1/8.
  *
  * The audio signal is bit-exact.
  *
  * The filter accepts the following options:
  */
export declare class AudioSine extends Filter<AudioSineParameters> {
    outputs: FilterStreamRef<AudioSineParameters, AudioSine>[];
    constructor(inputs?: Stream | Stream[], parameters?: AudioSineParameters);
}
export interface AudioSineParameters {
    /**
      * Set the carrier frequency. Default is 440 Hz.
      * @aliases f
      */
    frequency?: string | number;
    /**
      * Set the carrier frequency. Default is 440 Hz.
      * @aliasof frequency
      */
    f?: string | number;
    /**
      * Enable a periodic beep every second with frequency beep_factor times the carrier frequency. Default is 0, meaning the beep is disabled.
      * @aliases b
      */
    beep_factor?: string | number;
    /**
      * Enable a periodic beep every second with frequency beep_factor times the carrier frequency. Default is 0, meaning the beep is disabled.
      * @aliasof beep_factor
      */
    b?: string | number;
    /**
      * Specify the sample rate, default is 44100.
      * @aliases r
      */
    sample_rate?: string | number;
    /**
      * Specify the sample rate, default is 44100.
      * @aliasof sample_rate
      */
    r?: string | number;
    /**
      * Specify the duration of the generated audio stream.
      * @aliases d
      */
    duration?: string | number;
    /**
      * Specify the duration of the generated audio stream.
      * @aliasof duration
      */
    d?: string | number;
    /**
      * Set the number of samples per output frame.
      * The expression can contain the following constants:
      * n
      * The (sequential) number of the output audio frame, starting from 0.
      * pts
      * The PTS (Presentation TimeStamp) of the output audio frame, expressed in TB units.
      * t
      * The PTS of the output audio frame, expressed in seconds.
      * TB
      * The timebase of the output audio frames.
      * Default is 1024.
      */
    samples_per_frame?: string | number;
    [key: string]: string | number;
}
/**
  * 9.8 sine
  * Generate an audio signal made of a sine wave with amplitude 1/8.
  *
  * The audio signal is bit-exact.
  *
  * The filter accepts the following options:
  */
export declare function audioSine(inputs?: Stream | Stream[], parameters?: AudioSineParameters): AudioSine;