[Bug 772610] New: rtspsrc doesn't support redirect on play

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772610

            Bug ID: 772610
           Summary: rtspsrc doesn't support redirect on play
    Classification: Platform
           Product: GStreamer
           Version: 1.9.90
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: staples255 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 337233
  --> https://bugzilla.gnome.org/attachment.cgi?id=337233&action=edit
If a redirect is encountered on RTSP PLAY, close, reset protocols and restart
the play command

As mentioned by comments in rtspsrc.c, redirect is only implemented for the
RTSP DESCRIBE call.
For servers that redirect on PLAY, redirect sort of works, but only because UDP
recv times out and the reconnect behavior ends up doing the job.

I suspect that's what was going on with related bug,
https://bugzilla.gnome.org/show_bug.cgi?id=768232

The fix for that bug makes sure protocols aren't forced to tcp-only in
gst_rtspsrc_reconnect if a src->needs_reconnect is set.  However, since
reconnect only happens after a successful connect, it must have been trying to
reconnect on PLAY.  I suspect that only appeared to worked because the initial
PLAY call ignored the redirect but then UDP recv subsequently timed out, and
then reconnect used the new URL.

A better fix would be to implement redirect-on-play as shown in the attached
patch.

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