[Bug 705977] New: Performance regression because of planar format support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=705977
  GStreamer | gst-libav | git

           Summary: Performance regression because of planar format
                    support
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: wim.taymans at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


With the upgrade of libav, support for S16 and planar conversions were removed
internally and gst-libav now receives the raw planar F32 samples.

For AAC, gst-libav converts the planar F32 samples to interleaved and then
audioconvert converts the F32 samples to S16. This is a lot less efficient than
the tight single conversion loop that was previously used.

We should:

 - let the audio decoder render planar samples directly into the output buffer
 - make gst-libav output planar formats
 - add support for planar formats in audioconvert and possibly other elements
   that could be used in a typical playbin pipeline

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