817455 - Diagnose and fix stream underruns with getUserMedia

Status: RESOLVED WORKSFORME

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

Description

[Robert O'Callahan (:roc) (email my personal email if necessary)]

According to the logs in https://bugzilla.mozilla.org/show_bug.cgi?id=816664#c10, in the testcase(s) in that bug MediaStreamGraphImpl::WillUnderrun is showing underruns for the getUserMedia audio+video stream. We need to figure out why. It may be because we just haven't received any audio data yet.

Comment 1

[Paul Adenot (:padenot)]

So, I've investigated a bit on this. We are doing exactly two periods of underrun, at the, when we start the testcase (that is, at the very beginning), and we never underrun after those initial two (I've run the test case several time, each time for a while, with some logging to make sure).

I don't know enough about the whole MediaStream framework to draw conclusion yet, though, but I'm working on that.

Comment 2

[Jason Smith [:jsmith]]

I believe this bug was fixed when jesup landed the patch to fix the underrun stream asserts that we're firing in the gUM tests.