[Webkit-unassigned] [Bug 222448] New: [MSE] Overlapping MediaSamples are not deleted

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222448

            Bug ID: 222448
           Summary: [MSE] Overlapping MediaSamples are not deleted
           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: toshio.ogasawara at access-company.com

In WebKit's SourceBuffer design, MediaSamples can handle plural frames but the eviction process seemingly expects that a MediaSample should be linked to one frame. With this precondition, some unnecessary MediaSamples in SourceBuffer are not deleted when overlapped MediaSamples are appended.

When overlapped MediaSamples are composed of multiple frame data with DTS order and the following Condition A) or Condition B) is valid, the overlapped MediaSamples are not deleted; such MediaSamples are leaked.

Condition A): A MediaSample's PTS + its duration exceeds the next MediaSample's PTS
Condition B): The I-Frame start position of a newly appended MediaSample doesn't match the I-Frame start position of a MediaSample which is already buffered.

To make the SourceBuffer eviction algorithm more general, the eviction process should check the end of MediaSample instead of presentation timestamp (PTS).

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