RTCRtpSynchronizationSource

The RTCRtpSynchronizationSource dictionary of the the WebRTC API is used by getSynchronizationSources() to describe a particular synchronization source (SSRC). A synchronization source is a single source that shares timing and sequence number space. Since RTCRtpSynchronizationSource implements RTCRtpContributingSource, its properties are also available.

The information provided is based on the last ten seconds of media received.

While the published specification describes this as an interface, it has since been changed to a dictionary in follow-up drafts.

Properties

Also implements the properties of RTCRtpContributingSource.

voiceActivityFlag Optional
A Boolean value indicating whether or not voice activity is included in the last RTP packet played from the source. If the peer has indicated that it's not supporting voice activity detection, this field is not provided.

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome No support NoEdge ? 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 NoOpera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? 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 NoSafari iOS ? Samsung Internet Android No support No
voiceActivityFlagChrome No support NoEdge ? 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 NoOpera No support NoSafari ? WebView Android No support NoChrome Android No support NoEdge Mobile ? 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 NoSafari 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.

Document Tags and Contributors

Contributors to this page: fscholz, Sheppy
Last updated by: fscholz,