[Bug 750111] New: rtsp-media: emit signal for preparing dynamic payloads

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750111

            Bug ID: 750111
           Summary: rtsp-media: emit signal for preparing dynamic payloads
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-rtsp-server
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: george.kiagiadakis at collabora.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 304268
  --> https://bugzilla.gnome.org/attachment.cgi?id=304268&action=edit
patch

When using dynamic payloads, it is useful to know when rtsp-media has connected
to the pad-added signal, so that the application code can continue to add those
pads. If the dynpay element is a decodebin, the pads are always added after the
element changes state to PAUSED, which is set after connecting the pad-added
signal internally and therefore it works fine. However, there can be other
cases where the application needs to add the pads externally and therefore it
needs to know when is the right moment to do so.

This patch adds a "preparing" signal that is emitted at the end of
start_prepare, and compliments the "prepared" and "unprepared" signals.

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