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    Interface ConstantSourceNode

    The ConstantSourceNode interface—part of the Web Audio API—represents an audio source (based upon AudioScheduledSourceNode) whose output is single unchanging value. This makes it useful for cases in which you need a constant value coming in from an audio source. In addition, it can be used like a constructible AudioParam by automating the value of its offset or by connecting another node to it; see Controlling multiple parameters with ConstantSourceNode.

    MDN Reference

    interface ConstantSourceNode {
        channelCount: number;
        channelCountMode: ChannelCountMode;
        channelInterpretation: ChannelInterpretation;
        context: BaseAudioContext;
        numberOfInputs: number;
        numberOfOutputs: number;
        offset: AudioParam;
        onended: ((this: AudioScheduledSourceNode, ev: Event) => any) | null;
        addEventListener<K extends "ended">(
            type: K,
            listener: (
                this: ConstantSourceNode,
                ev: AudioScheduledSourceNodeEventMap[K],
            ) => any,
            options?: boolean | AddEventListenerOptions,
        ): void;
        addEventListener(
            type: string,
            listener: EventListenerOrEventListenerObject,
            options?: boolean | AddEventListenerOptions,
        ): void;
        connect(
            destinationNode: AudioNode,
            output?: number,
            input?: number,
        ): AudioNode;
        connect(destinationParam: AudioParam, output?: number): void;
        disconnect(): void;
        disconnect(output: number): void;
        disconnect(destinationNode: AudioNode): void;
        disconnect(destinationNode: AudioNode, output: number): void;
        disconnect(destinationNode: AudioNode, output: number, input: number): void;
        disconnect(destinationParam: AudioParam): void;
        disconnect(destinationParam: AudioParam, output: number): void;
        dispatchEvent(event: Event): boolean;
        removeEventListener<K extends "ended">(
            type: K,
            listener: (
                this: ConstantSourceNode,
                ev: AudioScheduledSourceNodeEventMap[K],
            ) => any,
            options?: boolean | EventListenerOptions,
        ): void;
        removeEventListener(
            type: string,
            listener: EventListenerOrEventListenerObject,
            options?: boolean | EventListenerOptions,
        ): void;
        start(when?: number): void;
        stop(when?: number): void;
    }

    Hierarchy (View Summary)

    Index

    Properties

    channelCount channelCountMode channelInterpretation context numberOfInputs numberOfOutputs offset onended

    Methods

    addEventListener connect disconnect dispatchEvent removeEventListener start stop

    Properties

    channelCount: number

    The channelCount property of the AudioNode interface represents an integer used to determine how many channels are used when up-mixing and down-mixing connections to any inputs to the node.

    MDN Reference

    channelCountMode: ChannelCountMode

    The channelCountMode property of the AudioNode interface represents an enumerated value describing the way channels must be matched between the node's inputs and outputs.

    MDN Reference

    channelInterpretation: ChannelInterpretation

    The channelInterpretation property of the AudioNode interface represents an enumerated value describing how input channels are mapped to output channels when the number of inputs/outputs is different. For example, this setting defines how a mono input will be up-mixed to a stereo or 5.1 channel output, or how a quad channel input will be down-mixed to a stereo or mono output.

    MDN Reference

    context: BaseAudioContext

    The read-only context property of the AudioNode interface returns the associated BaseAudioContext, that is the object representing the processing graph the node is participating in.

    MDN Reference

    numberOfInputs: number

    The numberOfInputs property of the AudioNode interface returns the number of inputs feeding the node. Source nodes are defined as nodes having a numberOfInputs property with a value of 0.

    MDN Reference

    numberOfOutputs: number

    The numberOfOutputs property of the AudioNode interface returns the number of outputs coming out of the node. Destination nodes — like AudioDestinationNode — have a value of 0 for this attribute.

    MDN Reference

    offset: AudioParam

    The read-only offset property of the ConstantSourceNode interface returns an AudioParam object indicating the numeric a-rate value which is always returned by the source when asked for the next sample.

    MDN Reference

    onended: ((this: AudioScheduledSourceNode, ev: Event) => any) | null

    MDN Reference

    Methods

    • The connect() method of the AudioNode interface lets you connect one of the node's outputs to a target, which may be either another AudioNode (thereby directing the sound data to the specified node) or an AudioParam, so that the node's output data is automatically used to change the value of that parameter over time.

      MDN Reference

      Parameters

      • destinationNode: AudioNode
      • Optionaloutput: number
      • Optionalinput: number

      Returns AudioNode

    • Parameters

      • destinationParam: AudioParam
      • Optionaloutput: number

      Returns void

    • The disconnect() method of the AudioNode interface lets you disconnect one or more nodes from the node on which the method is called.

      MDN Reference

      Returns void

    • Parameters

      • output: number

      Returns void

    • Parameters

      Returns void

    • Parameters

      Returns void

    • Parameters

      • destinationNode: AudioNode
      • output: number
      • input: number

      Returns void

    • Parameters

      Returns void

    • Parameters

      Returns void

    • The dispatchEvent() method of the EventTarget sends an Event to the object, (synchronously) invoking the affected event listeners in the appropriate order. The normal event processing rules (including the capturing and optional bubbling phase) also apply to events dispatched manually with dispatchEvent().

      MDN Reference

      Parameters

      Returns boolean

    • The removeEventListener() method of the EventTarget interface removes an event listener previously registered with EventTarget.addEventListener() from the target. The event listener to be removed is identified using a combination of the event type, the event listener function itself, and various optional options that may affect the matching process; see Matching event listeners for removal.

      MDN Reference

      Type Parameters

      • K extends "ended"

      Parameters

      Returns void

    • The removeEventListener() method of the EventTarget interface removes an event listener previously registered with EventTarget.addEventListener() from the target. The event listener to be removed is identified using a combination of the event type, the event listener function itself, and various optional options that may affect the matching process; see Matching event listeners for removal.

      MDN Reference

      Parameters

      Returns void

    • The start() method on AudioScheduledSourceNode schedules a sound to begin playback at the specified time. If no time is specified, then the sound begins playing immediately.

      MDN Reference

      Parameters

      • Optionalwhen: number

      Returns void

    • The stop() method on AudioScheduledSourceNode schedules a sound to cease playback at the specified time. If no time is specified, then the sound stops playing immediately.

      MDN Reference

      Parameters

      • Optionalwhen: number

      Returns void

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