[Bug 760590] New: query: recursive accept-caps query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760590

            Bug ID: 760590
           Summary: query: recursive accept-caps query
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: thiagossantos at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: christophevr at telenet.be, slomo at coaxion.net,
                    thiagossantos at gmail.com
        Depends on: 760477
     GNOME version: ---

+++ This bug was initially created as a clone of Bug #760477 +++

As we are replacing the current misused accept-caps queries we noticed that
there is a certain feature gap.

Before we were believing that using an accept-caps query would cause all the
pipeline downstream to verify if it would be able to accept a certain caps but
the accept-caps was created to be a pre-check of a caps event and only goes to
the next element.

Right now we have replaced accept-caps with a caps query +
gst_caps_can_intersect() or gst_caps_is_subset() but for some elements we need
to do a is_subset() while for others an intersect is enough.

Perhaps we should have a 'recursive' flag to a accept-caps query?

If we decide to do this in 1.x, we keep the current behavior and enable the
flag when needed. Every baseclass and lots of elements out there will need to
be updated so I'm not sure if this is a backwards compatible change.

Decided to open a bug so we can discuss and, if we defer it to 2.0, we can mark
it as so to discuss it again once the time arrives.

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