The optional property sdpMLineIndex in the RTCIceCandidateInit dictionary specifies the value of the RTCIceCandidate object's sdpMLineIndex property.
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 'RTCIceCandidateInit.sdpMLineIndex' in that specification. | Candidate Recommendation | Initial specification. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | Yes | Yes | 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 | ? | Yes |
RTCIceCandidate.sdpMLineIndexRTCPeerConnection.addIceCandidate()icecandidate
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https://developer.mozilla.org/en-US/docs/Web/API/RTCIceCandidateInit/sdpMLineIndex