Bug 133138

Summary: [Mac] DataCues do not work properly when rewinding video
Product: WebKit Reporter: Brent Fulgham <bfulgham>
Component: WebKit Misc.Assignee: Brent Fulgham <bfulgham>
Status: RESOLVED FIXED    
Severity: Normal CC: bfulgham, calvaris, commit-queue, eric.carlson, esprehn+autocc, gyuyoung.kim, philipj, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on: 132715    
Bug Blocks:    
Attachments:
Description Flags
Patch
none
Patch eric.carlson: review+

Description Brent Fulgham 2014-05-20 14:46:11 PDT 
If you play a video that has embedded WebKitDataCue elements, the cues are displayed properly as you watch the video. However, if you rewind the video, the data cues are not re-displayed.
Comment 1 Brent Fulgham 2014-05-20 14:49:39 PDT 
This bug was introduced with Bug 132715 (Changeset <http://trac.webkit.org/changeset/168519>).

1. DataCue objects do not provide the correct startTimeVariance value for AVFoundation use.
2. The comparison in "hasEquivalentStartTime" should be "<=", rather than "<" to handle the case of zero startTimeVariance.
Comment 2 Radar WebKit Bug Importer 2014-05-20 14:52:00 PDT 
<rdar://problem/16979086>
Comment 3 Brent Fulgham 2014-05-20 14:57:52 PDT 
Created attachment 231796 [details]
Patch
Comment 4 Eric Carlson 2014-05-20 17:02:19 PDT 
Comment on attachment 231796 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=231796&action=review

Did you mean to mark this r? If so, this looks good to me modulo the TextTrack.h change I don't understand.

> Source/WebCore/html/track/TextTrack.h:162
> +    virtual double startTimeVariance() const { return 0; }
> +

Why is this needed?
Comment 5 Brent Fulgham 2014-05-20 18:06:14 PDT 
Created attachment 231804 [details]
Patch
Comment 6 Brent Fulgham 2014-05-20 19:21:21 PDT 
Comment on attachment 231796 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=231796&action=review

>> Source/WebCore/html/track/TextTrack.h:162
>> +
> 
> Why is this needed?

This patch wasn't complete. Please check the current one.
Comment 7 Brent Fulgham 2014-05-20 21:09:24 PDT 
Committed r169146: <http://trac.webkit.org/changeset/169146>