843491 - onaddstream fires a non-usable MediaStream when a peer connection is given the same SDP to localDescription and remoteDescription

Status: RESOLVED INCOMPLETE

(Core :: WebRTC: Audio/Video, defect)

Description

[Jason Smith [:jsmith]]

Attachment: Testcase Zip File

Steps:

1. Load pc_realdevices_test.html
2. Select "Turn on local video 1 with gum video only"
3. Select "Create Peer Connection 1"
4. Select "Handle onaddstream PC 1"
5. Select "Add User 1 Video Stream to PC 1"
6. Select "PC 1 Offer"
7. Select "PC 1 Set Local Description First Offer"
8. Select "PC 1 Set Remote Description First Offer"

Expected:

If onaddstream was expected to fire, we should at least get a workable MediaStream that can be played back. If it's not expected, we should be getting an exception thrown somewhere in this execution process.

Actual:

onaddstream fires with a MediaStream that plays nothing.

Why would even bother firing onaddstream with a stream that can't even be played?

Comment 1

[Randell Jesup [:jesup] (needinfo me)]

Note: there may be a more general bug here which isn't covered by the summary of problems with local SDP == remote SDP.  That's not (on it's own) a real-world usecase.  But this particular case would be blocking-