[Bug 791736] New: wavenc: fix tag and toc handling

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791736

            Bug ID: 791736
           Summary: wavenc: fix tag and toc handling
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fengalin at free.fr
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 365692
  --> https://bugzilla.gnome.org/attachment.cgi?id=365692&action=edit
Test cases

Wavenc uses local tag list and toc which are initialized when receiving tag/toc
events. Upon EOS, the tag list and toc are written and wavenc decides what to
do with the tags/toc set by the user using the TAG_SETTER/TOC_SETTER
interfaces. The way it worked was such that the upstream tags/toc couldn't be
reseted nor replaced.

The first commit introduces test cases, which show the faulty behaviours:
- Receiving tags/toc from upstream.
- User triggered tags/toc reset.
- User triggered tags/toc replacement & tags append.

The third commit modifies tags/toc handling to use TAG_SETTER/TOC_SETTER for
both upstream tags/toc and user defined tags/toc.

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