RTCDataChannel.bufferedAmountLowThreshold

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The RTCDataChannel property bufferedAmountLowThreshold is used to specify the number of bytes of buffered outgoing data that is considered "low." The default value is 0. When the number of buffered outgoing bytes, as indicated by the bufferedAmount property, falls to or below this value, a bufferedamountlow event is fired. This event may be used, for example, to implement code which queues more messages to be sent whenever there's room to buffer them. Listeners may be added with onbufferedamountlow or addEventListener().

The user agent may implement the process of actually sending data in any way it chooses; this may be done periodically during the event loop or truly asynchronously. As messages are actually sent, this value is reduced accordingly.

bufferedamountlow events are not fired after the data channel is closed.

Syntax

var threshold = aDataChannel.bufferedAmountLowThreshold;

aDataChannel.bufferedAmountLowThreshold = threshold;

Value

The number of queued outgoing data bytes below which the buffer is considered to be "low."

Example

In this snippet of code, bufferedAmountLowThreshold is set to 64kB, and a handler for the bufferedamountlow event is established by setting the RTCDataChannel.onbufferedamountlow property to a function which should send more data into the buffer by calling send().

var dc = peerConnection.createDataChannel("File Transfer");
dc.bufferedAmountLowThreshold = 65535;

dc.onbufferedamountlow = function() {
  /* use send() to queue more data to be sent */
};

Specifications

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

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 56Edge ? Firefox No support NoIE No support NoOpera Full support 43Safari No support NoWebView Android Full support 56Chrome Android Full support 56Edge Mobile ? Firefox Android No support NoOpera Android Full support 43Safari iOS ? Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.

See also

Document Tags and Contributors

Contributors to this page: fscholz, dbrgn, Sheppy, jpmedley, Jib
Last updated by: fscholz,