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[Bug 21364] New: Simplify Coded Frame Processing (remove overlapped frame)

From: <bugzilla@jessica.w3.org>
Date: Thu, 21 Mar 2013 17:24:14 +0000
To: public-html-media@w3.org
Message-ID: <bug-21364-5436@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=21364

            Bug ID: 21364
           Summary: Simplify Coded Frame Processing (remove overlapped
                    frame)
    Classification: Unclassified
           Product: HTML WG
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Media Source Extensions
          Assignee: adrianba@microsoft.com
          Reporter: cyril.concolato@telecom-paristech.fr
        QA Contact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-media@w3.org

The Coded Frame Processing says:

13. If last decode timestamp for track buffer is unset and there is a coded
frame in track buffer with a presentation timestamp less than or equal to
presentation timestamp and presentation timestamp is less than this coded
frame's presentation timestamp plus its frame duration, then run the following
steps:
1. Let overlapped frame be the coded frame in track buffer that matches the
condition above.
2. If track buffer contains audio coded frames, then run the audio splice frame
algorithm and if a splice frame is returned, assign it to spliced frame.
3. Let overlapped frame presentation timestamp equal the presentation timestamp
of overlapped frame.
4. Let remove window timestamp equal overlapped frame presentation timestamp
plus 1 microsecond.
5. If track buffer contains video coded frames and the presentation timestamp
is greater than or equal to the overlapped frame presentation timestamp and the
presentation timestamp is less than the remove window timestamp, then remove
overlapped frame and any coded frames that depend on it from track buffer.

Step 5 is unnecessarily complicated: According to 1, the overlapped frame
satisfies the conditions in 13 so a) the track buffer contains video coded
frames and b) the presentation timestamp is greater or equal to the overlapped
frame presentation timestamp.

Step 5 can be rewritten as:

5. If the presentation timestamp is less than the remove window timestamp, then
remove overlapped frame and any coded frames that depend on it from track
buffer.

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Received on Thursday, 21 March 2013 17:24:16 UTC

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