85191 2012-04-30 07:16:03 -0700 MediaStream should not be an ActiveDOMObject 2012-05-07 08:02:14 -0700 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 adam.bergkvist webkit-unassigned abarth eric.carlson feature-media-reviews ojan per-erik.brodin tommyw webkit.review.bot oldest_to_newest 612609 0 adam.bergkvist 2012-04-30 07:16:03 -0700 The model with MediaStreamDescriptor and MediaStream (and LocalMediaStream) allows the JavaScript objects (MediaStream and LocalMediaStream) to be cleaned up while the MediaStreamDescriptor lives on to manage the stream in the platform. This happens for example when a URL is created to represent a MediaStream (using createObjectURL). The MediaStreamDescriptor is put into the MediaStreamRegistry and even though the MediaStream object is lost, the URL still works since the descriptor is kept in the registry. The changes introduced in r113460 turned MediaStream and LocalMediaStream into ActiveDOMObjects. On page reload, LocalMediaStream calls MediaStreamCenter::didStopLocalMediaStream() via its ActiveDOMObject::stop() method. However, when a page reload occurs, the LocalMediaStream object may have been cleaned up already. As a result, the behavior is different since MediaStreamCenter::didStopLocalMediaStream() is called when the LocalMediaStream object exists, but not if only the MediaStreamDescriptor is left. One way to make the behavior consistent would be to call MediaStreamCenter::didStopLocalMediaStream() when the descriptor is cleaned up, cause then we wouldn't be dependent on the LocalMediaStream object being alive. However, calling MediaStreamCenter::didStopLocalMediaStream() might not be the correct thing to do when all references to the descriptor are lost since there can be MediaStream objects constructed from the tracks of the LocalMediaStream that should continue to work. MediaStreamCenter::didStopLocalMediaStream() was intended for LocalMediaStream.stop() which is used to revoke access to devices; that should not necessarily happen when the descriptor of a LocalMediaStream is cleaned up. If it's necessary for some ports to signal to the platform that a MediaStreamDescriptor is cleaned up, then I would suggest adding a new function, willDestroyMediaStreamDescriptor(), to the MediaStreamCenter interface. 612611 1 139448 adam.bergkvist 2012-04-30 07:22:26 -0700 Created attachment 139448 Proposed patch 614129 2 tommyw 2012-05-02 02:44:17 -0700 After discussing this with Adam I agree that this is the best solution. 614358 3 139448 abarth 2012-05-02 09:34:22 -0700 Comment on attachment 139448 Proposed patch View in context: https://bugs.webkit.org/attachment.cgi?id=139448&action=review I didn't quite follow all the details in Comment #0, but if you and Tommy agree that this is the right thing to do, I'm willing to believe it. :) > Source/WebCore/ChangeLog:8 > + Made MediaStream a ContextDestructionObserver instead. Consider copying the text from comment #0 in the but to the ChangeLog. That's really helpful information and it would be nice to have it in the ChangeLog rather than a click away in the bug. 615157 4 adam.bergkvist 2012-05-03 04:17:38 -0700 Thank you. I'll update the ChangeLog before committing. 616217 5 tommyw 2012-05-04 07:54:28 -0700 Will you be committing this patch soon? 617449 6 adam.bergkvist 2012-05-07 01:18:51 -0700 I'll commit it today. 617560 7 140518 adam.bergkvist 2012-05-07 06:21:25 -0700 Created attachment 140518 Patch for landing 617602 8 140518 webkit.review.bot 2012-05-07 08:01:59 -0700 Comment on attachment 140518 Patch for landing Clearing flags on attachment: 140518 Committed r116311: <http://trac.webkit.org/changeset/116311> 617603 9 webkit.review.bot 2012-05-07 08:02:14 -0700 All reviewed patches have been landed. Closing bug. 139448 2012-04-30 07:22:26 -0700 2012-05-07 06:21:25 -0700 Proposed patch mediastream_cdo_1.patch text/plain 6273 adam.bergkvist ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJDb3JlL0No YW5nZUxvZwppbmRleCA5ZGQ0NzJlLi40OWQxM2Q0IDEwMDY0NAotLS0gYS9Tb3VyY2UvV2ViQ29y ZS9DaGFuZ2VMb2cKKysrIGIvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMjUg QEAKKzIwMTItMDQtMzAgIEFkYW0gQmVyZ2t2aXN0ICA8YWRhbS5iZXJna3Zpc3RAZXJpY3Nzb24u Y29tPgorCisgICAgICAgIE1lZGlhU3RyZWFtIHNob3VsZCBub3QgYmUgYW4gQWN0aXZlRE9NT2Jq ZWN0CisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD04NTE5 MQorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIE1hZGUg TWVkaWFTdHJlYW0gYSBDb250ZXh0RGVzdHJ1Y3Rpb25PYnNlcnZlciBpbnN0ZWFkLgorCisgICAg ICAgIEN1cnJlbnRseSBub3QgdGVzdGFibGUuCisKKyAgICAgICAgKiBNb2R1bGVzL21lZGlhc3Ry ZWFtL0xvY2FsTWVkaWFTdHJlYW0uY3BwOgorICAgICAgICAoV2ViQ29yZTo6TG9jYWxNZWRpYVN0 cmVhbTo6Y3JlYXRlKToKKyAgICAgICAgKiBNb2R1bGVzL21lZGlhc3RyZWFtL0xvY2FsTWVkaWFT 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