[Bug 678546] New: [hlsdemux] supply a more useful user-agent

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=678546
  GStreamer | gst-plugins-bad | git

           Summary: [hlsdemux] supply a more useful user-agent
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bugzilla.gnome at gpost.dk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The hlsdemux component use the default uri handler to fetch the required
resources. When this is HTTP(s) based, it talks to a remote server and
exchanges a user-agent that the remote server can use to log the client type
and serve specific content to work around known implementation bugs, etc.

A simple "gst-launch playbin uri=xxx" playback on my system reports the
user-agent:
 GStreamer souphttpsrc libsoup/2.38.1

Compared to CoreMedia based players this is rather uninformative, where a
sample agent is:
 AppleCoreMedia/1.0.0.11E53 (Macintosh; U; Intel Mac OS X 10_7_4; en_us)

I suggest to construct a slightly more informative user-agent, like:
 GStreamer/1.0.0 hlsdemux/0.11.92.1 libsoup/2.38.1

In order to do this reliably (since there is no standardised user-agent get/set
interface)  I suggest to always try to use the "souphttpsrc" plugin to fetch
the required files, and only use the default uri handler when it fails.

I will attach patches with both features,

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