[Bug 766020] New: pulse: default volume should be the last from the stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766020

            Bug ID: 766020
           Summary: pulse: default volume should be the last from the
                    stream
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: bugzilla at victortoso.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When I use pulseaudio backend in Spice, I retrieve the last volume from the
stream using pa_ext_stream_restore_read[0] and I can sync volume between
machines before any audio starts.

[0]
http://b045.isibrno.cz/share/doc/pulseaudio-libs-devel-0.9.21/html/ext-stream-restore_8h.html#a3e83c1723e241f9e308be4097e1d3973

With pulsesink/pulsesrc, if I try to get the volume before the stream has
started, I'll get the default "1.0" [1].

[1]
https://cgit.freedesktop.org/gstreamer/gst-plugins-good/tree/ext/pulse/pulsesink.c#n2612

I think we could use pa_ext_stream_restore if we have the stream-name and
return that instead of 100%

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