[gstreamer-bugs] [Bug 634687] New: RFC: operation hints for GstElement

GStreamer (bugzilla.gnome.org) bugzilla at gnome.org
Fri Nov 12 07:49:17 PST 2010


https://bugzilla.gnome.org/show_bug.cgi?id=634687
  GStreamer | gstreamer (core) | git

           Summary: RFC: operation hints for GstElement
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: ensonic at sonicpulse.de
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Bug #564749 mostly blocks on the GstTagReaderIface. An alternative would be to
have a set of hint-flags on GstElement. Those flags can be set on the pipeline,
individual bins and even elements. Bins could propagate the hints to new
children and hint-changes to existing children.

The purpose of the hints is to specify the intended use case a bit more to give
elements a chances for optimization. Right now gstreamer elements prepare to
support everything.

Some use cases
1) quickly play something from start to end
- no need for metadata
- no seeking/no playback rate changes
- no  mucking with the pipeline at all until eos

2) quick metadata reading
- no prerolling
- no seektable building

3) no caps changes (video in fullscreen)
- quicker pad_alloc or even no need to check for caps changes in basetransform

No proposal for a set of hints yet :/

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