[Webkit-unassigned] [Bug 213107] New: timestampOffset doesn't subtract presentationTimestamp from m_groupStartTimestamp

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213107

            Bug ID: 213107
           Summary: timestampOffset doesn't subtract presentationTimestamp
                    from m_groupStartTimestamp
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yuki.sekiguchi at access-company.com

Media Source spec defines

https://www.w3.org/TR/media-source/#sourcebuffer-coded-frame-processing
> 1.3.1 Set timestampOffset equal to group start timestamp - presentation timestamp.

The comment matches to the spec, but the code is different from the spec and the comment
https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/Modules/mediasource/SourceBuffer.cpp?rev=%09262766#L1485
> 1485	            // 1.3.1 Set timestampOffset equal to group start timestamp - presentation timestamp.
> 1486	            m_timestampOffset = m_groupStartTimestamp;

I couldn't create a content which reproduce this bug. Sorry.

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