[Bug 739685] New: RFC: add API to GstPreset to compare presets

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739685
  GStreamer | gstreamer (core) | 1.x

           Summary: RFC: add API to GstPreset to compare presets
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: ensonic at sonicpulse.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Applications using the preset system will e.g. show a list of presets and the
properties of the element. When selecting a preset the properties get updated.
When the user now edits the properties further, the user derives the preset.

It would be nice if the UI could check if the current settings are still equal
to what was initially set by the preset and if not how they differ.

One way to do this could be a function in the preset iface that returns the
distance between the current settings and a given preset. Patch follows.

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