The RTCIceCandidateStats
dictionary's priority
property is a positive integer value indicating the priority (or desirability) of the described candidate. During ICE negotiation while setting up a WebRTC peer connection, the priority values reported to the remote peer by a user agent are used to determine which candidates are considered "more desirable". The higher the value, the more desirable the candidate is.
Syntax
priority = rtcIceCandidateStats.priority;
Value
A positive integer indicating the priority of the RTCIceCandidate
described by the RTCIceCandidateStats
object. The value may be anywhere from 1 to 2,147,483,647.
Determining priority
The ICE specification describes how user agents and other software using WebRTC should calculate the priority. The priority of a candidate is calculated using the following variables as inputs:
- The preferability of the candidate type (local, server reflexive, peer reflexive, or relayed)
- The preferability of the candidate's specific IP address (for multihomed agents)
- The candidate's component ID (1 for RTP, 2 for RTCP)
The candidate's priority is computed using the formula (ptype is the priority of the candidate's type and plocal is the priority of the IP address):
This is equivalent to mapping the priorities of teh candidate type, the local IP, and the component ID into various bit ranges within the 32-bit priority
value.
Specifications
Specification | Status | Comment |
---|---|---|
Identifiers for WebRTC's Statistics API The definition of 'RTCIceCandidateStats.port' in that specification. |
Candidate Recommendation | Initial specification. |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
port | Chrome No support No | Edge No support No | Firefox
Full support
27
| IE No support No | Opera ? | Safari ? | WebView Android No support No | Chrome Android No support No | Firefox Android
Full support
27
| Opera Android ? | Safari iOS ? | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Uses a non-standard name.
- Uses a non-standard name.
See also
- RFC 5245: 4.1.2.1: Recommended Formula section in the ICE specification