[Bug 765600] New: Add gst_memory_try_map or new GstMapFlags to silent GST_ERROR on some situation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765600

            Bug ID: 765600
           Summary: Add gst_memory_try_map or new GstMapFlags to silent
                    GST_ERROR on some situation
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: julien.isorce at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently gst_memory_map always outputs a GST_ERROR on alocator->mem_map
failutre:
https://cgit.freedesktop.org/gstreamer/gstreamer/tree/gst/gstmemory.c#n324

There is at least one situation where we would like to use gst_memory_map as a
try function: dmabuf.
Indeed we need to check at runtime if the given dmabuf is mappable and try
another caps if not. So even if it fails it would be part of the caps
negotiation phase so no need a GST_ERROR:
https://github.com/CapOM/gstreamer-vaapi/commit/2a55a5fc774eb8bba68094ba231f06b8b07b3969#diff-bec9172c05be682d331c790d8a50ba95R195

Other solution would be to add a new GstMapFlags that would silent the error.

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