[Bug 707606] New: emit a signal when reverse-funnel-mode is enabled in output-selector

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=707606
  GStreamer | gstreamer (core) | git

           Summary: emit a signal when reverse-funnel-mode is enabled in
                    output-selector
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: hoonh83.lee at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=254224)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=254224)
This patch file contains the diff information with reverse funnel. 

Overview:
In case of using reverse-funnel-mode,
emit a signal when a src pad is created internally to upper layer.

Expected Results:
1. 'reverse-funnel-mode' of property is set as TRUE.
   (it is not permitted to create src pads by requesting from external)
2. When a GST_EVENT_CAPS event is received, create a src pad.
   And then maps it with stream-id.
3. Emit a signal with the created pad to upper layer.
4. Upper layer is able to know that information of the src pad with caps.

Additional Information:
This patch has dependency with 707605
(https://bugzilla.gnome.org/show_bug.cgi?id=707605)

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