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 compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`voiceActivityFlag`	Chrome No support No	Edge No support No	Firefox Full support 59 Disabled Full support 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.	IE No support No	Opera No support No	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 59 Disabled Full support 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.	Opera Android No support No	Safari iOS ?	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
User must explicitly enable this feature.: User must explicitly enable this feature.