[Bug 774112] New: mpdparser: MS PlayReady ContentProtection event is truncated

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774112

            Bug ID: 774112
           Summary: mpdparser: MS PlayReady ContentProtection event is
                    truncated
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: philn at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When the demuxer emits the protection event it uses strlen() to get the data
length but in some cases (PlayReady...) the data can have a \0 before the end
of the actual data.

The proposed fix is to store the base64 decoded_len in the descriptor and
fallback to strlen() in other cases.

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