The read-only sdpMLineIndex property on the RTCIceCandidate interface is a zero-based index of the m-line describing the media associated with the candidate.
This value is specified when creating the RTCIceCandidate by setting the corresponding sdpMLineIndex value in the RTCIceCandidateInit object when creating a new candidate with new RTCIceCandidate().
If you instead call RTCIceCandidate() with a string parameter containing the candidate m-line text, the value of sdpMLineIndex is extracted from the m-line.
Syntax
var sdpMLineIndex = RTCIceCandidate.sdpMLineIndex;
Value
A number containing a 0-based index into the set of m-lines providing media descriptions, indicating which media source is associated with the candidate, or null if no such association is available.
Note: Attempting to add a candidate (using addIceCandidate()) that has a value of null for either sdpMid or sdpMLineIndex will throw a TypeError exception.
Example
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Specifications
| Specification | Status | Comment |
| WebRTC 1.0: Real-time Communication Between BrowsersThe definition of 'RTCIceCandidate.sdpMLineIndex' in that specification. | Candidate Recommendation | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
sdpMLineIndex
|
Chrome
Full support 23 |
Edge
Full support 15 |
Firefox
Full support 22 |
IE
No support No |
Opera
Full support 15 |
Safari
Full support Yes |
WebView Android
Full support Yes |
Chrome Android
Full support 25 |
Firefox Android
Full support Yes |
Opera Android
Full support 14 |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.5 |
Legend
- Full support
- Full support
- No support
- No support
RTCIceCandidate.sdpMLineIndex by Mozilla Contributors is licensed under CC-BY-SA 2.5.
