The getSynchronizationSources() method of the RTCRtpReceiver interface returns an array of RTCRtpContributingSource instances, each corresponding to one SSRC (synchronization source) identifier received by the current RTCRtpReceiver in the last ten seconds.
RTCRtpReceiver.getSynchronizationSources()
Syntax
getSynchronizationSources()
Parameters
None.
Return value
An array of object describing one of the synchronization sources that provided data to the incoming stream in the past ten seconds. These objects contain the following properties:
-
audioLevelOptional -
A double-precision floating-point value between 0.0 and 1.0 specifying the audio level (in dBov) contained in the last RTP packet played from this source.
-
rtpTimestampOptional -
The RTP timestamp of the media played out at the time indicated by
timestamp. This value is a source-generated time value which can be used to help with sequencing and synchronization. -
sourceOptional -
A 32-bit unsigned integer value specifying the CSRC identifier of the contributing source.
-
timestampOptional -
A
DOMHighResTimeStampindicating the most recent time at which a frame originating from this source was delivered to the receiver'sMediaStreamTrack.
Specifications
| Specification |
|---|
| WebRTC 1.0: Real-Time Communication Between Browsers # dom-rtcrtpreceiver-getsynchronizationsources |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
getSynchronizationSources |
73
|
79
|
59
|
No
|
60
|
12.1
|
73
|
73
|
No
|
52
|
12.2
|
11.0
|
audio_tracks_supported |
73
|
79
|
59
|
No
|
60
|
12.1
|
73
|
73
|
No
|
52
|
12.2
|
11.0
|
video_tracks_supported |
73
|
≤79
|
68
|
No
|
60
|
12.1
|
73
|
73
|
No
|
52
|
12.2
|
11.0
|
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpReceiver/getSynchronizationSources
