Bug 58637

Summary: REGRESSION: Rendering in <video> element appears to render quickly to catch up if it has been playing in a background tab
Product: WebKit Reporter: Jer Noble <jer.noble>
Component: MediaAssignee: Jer Noble <jer.noble>
Status: RESOLVED FIXED    
Severity: Normal CC: eric.carlson, mrowe
Priority: P2 Keywords: InRadar, PlatformOnly
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.6   
URL: http://flyingmeat.com/stuff/doubledoubleyourstrokestyle.mov
Attachments:
Description Flags
Patch
none
Patch eric.carlson: review+

Description Jer Noble 2011-04-14 23:21:53 PDT 
1. Load <http://flyingmeat.com/stuff/doubledoubleyourstrokestyle.mov> in a tab, then switch to a background tab.
2. Wait around 30 seconds.
3. Switch back to the tab with the video.

The video renders at high speed as it catches back up to the correct playback position.
Comment 1 Jer Noble 2011-04-14 23:22:12 PDT 
<rdar://problem/9144405>
Comment 2 Jer Noble 2011-04-14 23:27:51 PDT 
Created attachment 89742 [details]
Patch
Comment 3 Eric Carlson 2011-04-15 07:09:15 PDT 
Comment on attachment 89742 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=89742&action=review

> Source/WebKit2/WebProcess/WebPage/ca/mac/LayerTreeHostCAMac.mm:119
> +    CALayer* root = rootLayer()->platformLayer();
> +    [[NSNotificationCenter defaultCenter] postNotificationName:@"NSCAViewRenderDidPauseNotification" object:nil userInfo:[NSDictionary dictionaryWithObject:root forKey:@"layer"]];
> +    [root setValue:(id)kCFBooleanTrue forKey:@"NSCAViewRenderPaused"];

Shouldn't you set the property before posting the notification?

> Source/WebKit2/WebProcess/WebPage/ca/mac/LayerTreeHostCAMac.mm:126
> +    CALayer* root = rootLayer()->platformLayer();
> +    [[NSNotificationCenter defaultCenter] postNotificationName:@"NSCAViewRenderDidResumeNotification" object:nil userInfo:[NSDictionary dictionaryWithObject:root forKey:@"layer"]];
> +     [root setValue:(id)kCFBooleanFalse forKey:@"NSCAViewRenderPaused"];

Ditto.
Comment 4 Jer Noble 2011-04-15 10:34:22 PDT 
Created attachment 89806 [details]
Patch
Comment 5 Jer Noble 2011-04-15 11:07:44 PDT 
Committed r83994: <http://trac.webkit.org/changeset/83994>