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.
var sdpMLineIndex = RTCIceCandidate.sdpMLineIndex;
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.
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| Specification | Status | Comment |
|---|---|---|
| WebRTC 1.0: Real-time Communication Between Browsers The definition of 'RTCIceCandidate.sdpMLineIndex' in that specification. | Candidate Recommendation | Initial definition. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | 15 | 22 | ? | Yes | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Yes | Yes | Yes | ? | Yes | ? | Yes |
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/RTCIceCandidate/sdpMLineIndex