[Webkit-unassigned] [Bug 241513] New: [GStreamer][EME] Restore the "CDMInstanceProxy::releaseDecryptionResources" virtual method

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241513

            Bug ID: 241513
           Summary: [GStreamer][EME] Restore the
                    "CDMInstanceProxy::releaseDecryptionResources" virtual
                    method
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bandou.yacine at gmail.com

This method is removed since this commit "https://github.com/WebKit/WebKit/commit/7b806050f2bbebb".

We should restore this method, in order to be overloaded when we need release the DRM resources.

In some proprietary embedded DRM implementation we need to release some resources in order to
be able change the DRM system (like passing from PlayReady to Widevine), and start a new playback,
without the javascript GC is performed.

For example, in some chipsets, we can not initialize the TEE for multiple DRM systems at the same time.

In this EME test page "https://ytlr-cert.appspot.com/2020/main.html?test_type=encryptedmedia-test" we change DRM
system from Widevine to Playready.

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