234131 2021-12-10 01:28:48 -0800 [Cocoa] -[AVPlayerItem liveUpdateTime] can hang the main thread for ~60ms 2021-12-11 00:48:39 -0800 1 1 1 Unclassified WebKit Media WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 jer.noble jer.noble eric.carlson ews-watchlist glenn philipj sergio webkit-bug-importer oldest_to_newest 1822575 0 jer.noble 2021-12-10 01:28:48 -0800 [Cocoa] -[AVPlayerItem liveUpdateThread] can hang the main thread for ~60ms 1822576 1 jer.noble 2021-12-10 01:29:17 -0800 <rdar://86307593> 1822578 2 446682 jer.noble 2021-12-10 01:34:04 -0800 Created attachment 446682 Patch 1822728 3 446682 eric.carlson 2021-12-10 08:39:36 -0800 Comment on attachment 446682 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=446682&action=review > Source/WebCore/ChangeLog:3 > + [Cocoa] -[AVPlayerItem liveUpdateThread] can hang the main thread for ~60ms Do you mean -[AVPlayerItem liveUpdateInterval]? > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3839 > + auto queueTaskOnEventLoopWithPlayer = [self, strongSelf = retainPtr(self)] (Function<void(MediaPlayerPrivateAVFoundationObjC&)>&& function) mutable { s/strongSelf = retainPtr(self)/strongSelf = RetainPtr { self }/ > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3856 > + auto seekableTimeRanges = retainPtr((NSArray*)newValue); s/ = retainPtr( ... )/ = RetainPtr { ... }/ > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3858 > + auto playerItem = retainPtr((AVPlayerItem*)object); The player doesn't need to be kept alive so you could avoid the refcount churn by just casting to an AVPlayerItem > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3866 > + queueTaskOnEventLoopWithPlayer([keyPath = retainPtr(keyPath), change = retainPtr(change), object = retainPtr(object), context] (auto& player) mutable { s/ = retainPtr( ... )/ = RetainPtr { ... }/ 1822750 4 jer.noble 2021-12-10 09:20:40 -0800 (In reply to Eric Carlson from comment #3) > Comment on attachment 446682 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=446682&action=review > > > Source/WebCore/ChangeLog:3 > > + [Cocoa] -[AVPlayerItem liveUpdateThread] can hang the main thread for ~60ms > > Do you mean -[AVPlayerItem liveUpdateInterval]? Whoops, yes I do. > > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3839 > > + auto queueTaskOnEventLoopWithPlayer = [self, strongSelf = retainPtr(self)] (Function<void(MediaPlayerPrivateAVFoundationObjC&)>&& function) mutable { > > s/strongSelf = retainPtr(self)/strongSelf = RetainPtr { self }/ Ok. > > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3856 > > + auto seekableTimeRanges = retainPtr((NSArray*)newValue); > > s/ = retainPtr( ... )/ = RetainPtr { ... }/ > > > Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:3858 > > + auto playerItem = retainPtr((AVPlayerItem*)object); > > The player doesn't need to be kept alive so you could avoid the refcount > churn by just casting to an AVPlayerItem So, I think I'm going to have to modify the patch to explicitly do this query on a background queue. The KVO will happen on the main thread most of the time, in which case, I need to keep this a RetainPtr so I can pass it through to a background queue. 1822792 5 446753 jer.noble 2021-12-10 10:30:11 -0800 Created attachment 446753 Patch for landing 1823177 6 ews-feeder 2021-12-11 00:48:37 -0800 Committed r286907 (245133@main): <https://commits.webkit.org/245133@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 446753. 446682 2021-12-10 01:34:04 -0800 2021-12-10 08:39:36 -0800 Patch bug-234131-20211210013403.patch text/plain 18098 jer.noble U3VidmVyc2lvbiBSZXZpc2lvbjogMjg2ODM4CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggYTcyOTUzNTU0OTEwMzk4 Y2ZiZTk1YzMzM2U5NzkwZmUyY2IzMTQyZS4uNDI2MmMxYWI0ODA0NjM4ZGI0YWIzZjliYjk0MGYy ODk3ZmI2YzQwZCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIzIEBACisyMDIxLTEyLTEwICBKZXIg Tm9ibGUgIDxqZXIubm9ibGVAYXBwbGUuY29tPgorCisgICAgICAgIFtDb2NvYV0gLVtBVlBsYXll ckl0ZW0gbGl2ZVVwZGF0ZVRocmVhZF0gY2FuIGhhbmcgdGhlIG1haW4gdGhyZWFkIGZvciB+NjBt cworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjM0MTMx CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgRGlyZWN0 IHByb3BlcnR5IGFjY2VzcyBvZiBBVkZvdW5kYXRpb24gb2JqZWN0cyBjYW4gdGFrZSB0ZW5zIG9m 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