[Webkit-unassigned] [Bug 223742] New: [EME][GStreamer] Abort decryptor operations immediately and without errors on flush

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223742

            Bug ID: 223742
           Summary: [EME][GStreamer] Abort decryptor operations
                    immediately and without errors on flush
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eocanha at igalia.com
                CC: bugs-noreply at webkitgtk.org

A decryptor transformInPlace() operation can cause potentially long waits in two situations:

- transformInPlace() is waiting to get the cdmProxy.
- The CDMProxy::decrypt() method is internally waiting for a specific key to become available.

If a seek operation is performed during those long waits, the main thread will be blocked until the seek finishes the conditions those long waits are waiting for will never be fulfilled (because the operations that complete them happen in the main thread, which is blocked), the internal wait timeouts will trigger and the decoder will trigger an unrecoverable error.

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