RTCRtpTransceiver: direction property

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

* Some parts of this feature may have varying levels of support.

See full compatibility

The RTCRtpTransceiver property direction is a string that indicates the transceiver's preferred directionality.

The directionality indicates whether the transceiver will offer to send and/or receive RTP data, or whether it is inactive or stopped (terminated). When setting the transceiver's direction, the value is not applied immediately. The current direction is indicated by the currentDirection property.

Value

A string with one of the following values:

"sendrecv"

Transceiver offers to send and receive RTP data:

RTCRtpSender: Offers to send RTP data, and will do so if the remote peer accepts the connection and at least one of the sender's encodings is active.
RTCRtpReceiver: Offers to receive RTP data, and does so if the remote peer accepts.

"sendonly"

Transceiver offers to send but not receive RTP data:

RTCRtpSender: Offers to send RTP data, and will do so if the remote peer accepts the connection and at least one of the sender's encodings is active.
RTCRtpReceiver: Does not offer to receive RTP data and will not do so.

"recvonly"

Transceiver offers to receive but not set RTP data:

RTCRtpSender: Does not offer to send RTP data, and will not do so.
RTCRtpReceiver: Offers to receive RTP data, and will do so if the remote peer offers.

"inactive"

Transceiver is inactive:

RTCRtpSender: Does not offer to send RTP data, and will not do so.
RTCRtpReceiver: Does not offer to receive RTP data and will not do so.

"stopped"

This is the terminal state of the transceiver. The transceiver is stopped and will not send or receive RTP data or offer to do so. Setting this value when the transceiver is not already stopped raises a TypeError.

RTCRtpSender: Does not offer to send RTP data, and will not do so.
RTCRtpReceiver: Does not offer to receive RTP data and will not do so.

Exceptions

When setting the value of direction, the following exception can occur:

InvalidStateError DOMException: The receiver's RTCPeerConnection is closed or the RTCRtpReceiver is stopped.
TypeError: The value is being set to stopped when the current value is anything other than stopped.

Description

The direction property can be used to set or get the transceiver's preferred directionality.

Updating the directionality does not take effect immediately. If the new value of direction is different from the existing value, renegotiation of the connection is required, so a negotiationneeded event is sent to the RTCPeerConnection. A direction value (other than stopped) is then used by RTCPeerConnection.createOffer() or RTCPeerConnection.createAnswer() in order to generate the SDP message created those methods. For example, if the direction is specified as "sendrecv", the corresponding SDP a-line indicates the directionality:

a=sendrecv

The new directionality takes effect once the negotiation process is completed and the new session description is successfully applied.

The transceiver's current direction is indicated by the currentDirection property.

Specifications

Specification
WebRTC: Real-Time Communication in Browsers # dom-rtcrtptransceiver-direction

Browser compatibility

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`direction`	Chrome – Full support Chrome 69 (Release date: 2018-09-04) footnote Full support	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote Full support	Firefox – Full support Firefox 59 (Release date: 2018-03-13) footnote Full support	Opera – Full support Opera 56 (Release date: 2018-09-25) footnote Full support	Safari – Full support Safari 11 (Release date: 2017-09-19) footnote Full support	Chrome Android – Full support Chrome Android 69 (Release date: 2018-09-04) footnote Full support	Firefox for Android – Full support Firefox for Android 59 (Release date: 2018-03-13) footnote Full support	Opera Android – Full support Opera Android 48 (Release date: 2018-11-08) footnote Full support	Safari on iOS – Full support Safari on iOS 11 (Release date: 2017-09-19) footnote Full support	Samsung Internet – Full support Samsung Internet 10 (Release date: 2019-08-22) footnote Full support	WebView Android – Full support WebView Android 69 (Release date: 2018-09-04) footnote Full support	WebView on iOS – Full support WebView on iOS 11 (Release date: 2017-09-19) footnote Full support
`"stopped"` value	Chrome – Full support Chrome 103 (Release date: 2022-06-21) footnote Full support	Edge – Full support Edge 103 (Release date: 2022-06-23) footnote Full support	Firefox – Full support Firefox 118 (Release date: 2023-09-26) footnote Full support	Opera – Full support Opera 89 (Release date: 2022-07-07) footnote Full support	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 103 (Release date: 2022-06-21) footnote Full support	Firefox for Android – Full support Firefox for Android 118 (Release date: 2023-09-26) footnote Full support	Opera Android – Full support Opera Android 71 (Release date: 2022-09-16) footnote Full support	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 20 (Release date: 2023-02-10) footnote Full support	WebView Android – Full support WebView Android 103 (Release date: 2022-06-21) footnote Full support	WebView on iOS – No support WebView on iOS footnote No support

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Full support: Full support
No support: No support