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RTCRtpSynchronizationSource.voiceActivityFlag

The read-only voiceActivityFlag property of the RTCRtpSynchronizationSource interface indicates whether or not the most recent RTP packet on the source includes voice activity. This is only present if the stream is using the voice activity detection feature; see the RTCOfferOptions flag voiceActivityDetection.

Syntax

var voiceActivity = RTCRtpSynchronizationSource.voiceActivityFlag

Value

A Boolean value which is true if voice activity is present in the most recently received RTP packet played by the associated source, or false if voice activity is not present.

This property is omitted entirely if voice activity detection is not enabled on the source, or if the RFC 6464 extension header isn't present.

Specifications

Specification	Status	Comment
WebRTC 1.0: Real-time Communication Between Browsers The definition of 'voiceActivityFlag' in that specification.	Candidate Recommendation	Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	No	?	59 Disabled 59 Disabled Disabled From version 59: this feature is behind the `media.peerconnection.rtpsourcesapi.enable` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	No	No	?

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	No	No	?	59 Disabled 59 Disabled Disabled From version 59: this feature is behind the `media.peerconnection.rtpsourcesapi.enable` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config.	No	?	No

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https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpSynchronizationSource/voiceActivityFlag