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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - WebRTC: Make MediaEndpointPeerConnection handle remotely assigned mids correctly"
href="https://bugs.webkit.org/show_bug.cgi?id=163202">163202</a>
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<th>Summary</th>
<td>WebRTC: Make MediaEndpointPeerConnection handle remotely assigned mids correctly
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>WebCore Misc.
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>adam.bergkvist@ericsson.com
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<pre>An RTCRtpTransceiver has a null mid until it's been associated with a media description (with a mid) [1]. During that time, it's identified by a provisional mid that might become its real mid, but the transceiver can also get its mid assigned by a remote media description. In the second case, the mid value is initially unknown. A transceiver's RTCRtpSender must directly (synchronously in the script) provide a muted remote source that is playable by, for example, media element. This source is initially registered in the MediaEndpoint (WebRTC backend) with the transceiver's provisional mid. So, if the real mid is set by a remote description, the registered mid must be updated to preserve the association between the registered source and the transceiver.
[1] <a href="https://w3c.github.io/webrtc-pc/archives/20160913/webrtc.html#dom-rtcrtptransceiver-mid">https://w3c.github.io/webrtc-pc/archives/20160913/webrtc.html#dom-rtcrtptransceiver-mid</a></pre>
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