RTCRtpTransceiver - Web APIs 编辑

The WebRTC interface RTCRtpTransceiver describes a permanent pairing of an RTCRtpSender and an RTCRtpReceiver, along with some shared state.

Each SDP media section describes one bidirectional SRTP ("Secure Real Time Protocol") stream (excepting the media section for RTCDataChannel, if present). This pairing of send and receive SRTP streams is significant for some applications, so RTCRtpTransceiver is used to represent this pairing, along with other important state from the media section. Each non-disabled SRTP media section is always represented by exactly one transceiver.

A transceiver is uniquely identified using its mid property, which is the same as the media ID (mid) of its corresponding m-line. An RTCRtpTransceiver is associated with an m-line if its mid is non-null; otherwise it's considered disassociated.

Properties

currentDirection Read only

A read-only string from the enum RTCRtpTransceiverDirection which indicates the transceiver's current directionality, or null if the transceiver is stopped or has never participated in an exchange of offers and answers. To change the transceiver's directionality, set the value of the direction property.

direction

A string from the enum RTCRtpTransceiverDirection which is used to set the transceiver's desired direction.

mid Read only

The media ID of the m-line associated with this transceiver. This association is established, when possible, whenever either a local or remote description is applied. This field is null if neither a local or remote description has been applied, or if its associated m-line is rejected by either a remote offer or any answer.

receiver Read only

The RTCRtpReceiver object that handles receiving and decoding incoming media.

sender Read only

The RTCRtpSender object responsible for encoding and sending data to the remote peer.

stopped

Indicates whether or not sending and receiving using the paired RTCRtpSender and RTCRtpReceiver has been permanently disabled, either due to SDP offer/answer, or due to a call to stop().

Methods

setCodecPreferences()

A list of RTCRtpCodecParameters objects which override the default preferences used by the user agent for the transceiver's codecs.

stop()

Permanently stops the RTCRtpTransceiver. The associated sender stops sending data, and the associated receiver likewise stops receiving and decoding incoming data.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• WebRTC API
• Introduction to the Real-time Transport Protocol (RTP)
• RTCPeerConnection.addTrack() and RTCPeerConnection.addTransceiver() both create transceivers
• RTCRtpReceiver and RTCRtpSender