[Bug 793059] New: Implement automatic stream management in WASAPI

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793059

            Bug ID: 793059
           Summary: Implement automatic stream management in WASAPI
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nirbheek.chauhan at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently, when using wasapisrc/wasapisink, if the default source devices
changes WASAPI captures and sends us silence, and if the default sink device
changes WASAPI throws away all rendered audio. Starting with Windows 10, WASAPI
now has automatic stream management:

https://msdn.microsoft.com/en-us/library/windows/desktop/mt784437(v=vs.85).aspx

We should implement this in such a way that this mechanism is used at runtime
if running on Windows 10, and a fallback mechanism (manually switching devices)
is used when running on Windows 7 or 8.

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