[gstreamer-bugs] [Bug 567642] New: spectrum element has undocumented arbitrary limitation on interval

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: 0.10.8
           Summary: spectrum element has undocumented arbitrary limitation
                    on interval
           Product: GStreamer
           Version: 0.10.8
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: cdhowie at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.21/2.22
   GNOME milestone: Unspecified


Please describe the problem:
I've been working on a project to bring visualization to Banshee, and the
spectrum element has been giving me headaches lately.  I have interval set to
GST_SECOND/60, expecting 60 messages to be posted to the bus per second, so I
can multiplex that with the audio stream and push it to a visualizer.

Unfortunately, the spectrum element has a fixed window size of 1024 samples
(per channel) and will only post once per 1024 samples.  At 44100Hz, this means
44100/1024 =~ 43.07 posts per second, not 60.  In order to achieve 60 posts per
second I would need a samplerate of 1024*60 = 61440Hz.  The resample would
degrade performance noticeably on mid-lower end boxes.

Can this be fixed so that the window size is not declared at compile-time and
is instead a function of the samplerate and requested interval?  Or could this
limitation at least be documented somewhere?

Thanks,
Chris

Steps to reproduce:


Actual results:


Expected results:


Does this happen every time?


Other information:


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