[Bug 756968] New: rtsp-stream: GstBin leak in udp-mcast case

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=756968

            Bug ID: 756968
           Summary: rtsp-stream: GstBin leak in udp-mcast case
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-rtsp-server
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: davidsf at axis.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 313862
  --> https://bugzilla.gnome.org/attachment.cgi?id=313862&action=edit
rtsp-stream: plug GstBin leak in udp-mcast case

When setting a GstRTSPMedia to playing, GstRTSPStreamTransports are added to
GstRTSPStreams. Then, the function update_transport() in rtsp-stream.c is
called. We have found a leak here for udp-mcast transports. Part of a valgrind
log:

Running suite(s): rtp
==27802== 19,599 (776 direct, 18,823 indirect) bytes in 1 blocks are definitely
lost in loss record 4,271 of 4,276
==27802==    at 0x7653B8C: g_type_create_instance (gtype.c:1847)
==27802==    by 0x7637F30: g_object_new_internal (gobject.c:1724)
==27802==    by 0x7639B9C: g_object_newv (gobject.c:1868)
==27802==    by 0x7262B86: gst_element_factory_create (gstelementfactory.c:376)
==27802==    by 0x72630A3: gst_element_factory_make (gstelementfactory.c:446)
==27802==    by 0x7344852: priv_gst_parse_yyparse (grammar.y:688)
==27802==    by 0x734891F: priv_gst_parse_launch (grammar.y:1050)
==27802==    by 0x7334E02: gst_parse_launch_full (gstparse.c:325)
==27802==    by 0x7334C79: gst_parse_launch (gstparse.c:290)
==27802==    by 0x6C528FC: default_create_element (rtsp-media-factory.c:1176)
==27802==    by 0x6C5324A: gst_rtsp_media_factory_create_element
(rtsp-media-factory.c:1344)
...
100%: Checks: 3, Failures: 0, Errors: 0
Makefile:3762: recipe for target 'rtp/rtp.valgrind' failed
make: *** [rtp/rtp.valgrind] Error 1

It is a GstBin that leaks in update_transport(). The attached patch contains a
fix for this.

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