[Webkit-unassigned] [Bug 227865] New: [MSE] SourceBuffer.appendState is only ever WaitingForSegment

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sun Jul 11 20:04:14 PDT 2021


            Bug ID: 227865
           Summary: [MSE] SourceBuffer.appendState is only ever
           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: jean-yves.avenard at apple.com

Per MSE spec, a source buffer has a parsing state attribute that can be of any 3 values: WAITING_FOR_SEGMENT, PARSING_INIT_SEGMENT, PARSING_MEDIA_SEGMENT

This internal state is used to safeguard incorrectly calling SourceBuffer.setAppendMode [1] or modifying SourceBuffer.timeStampOffset [2] while we're in the middle of processing a media segment and to throw an exception if we are.

However, in the current code, SourceBuffer::m_appendState is only ever set to AppendStateType::WaitingForSegment

The state value should be updated in the Segment Parser Loop that is handled by SourceBufferPrivate but isn't.

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