[Bug 754450] New: Increase the limit of frequency and channel number for audiotestsrc

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754450

            Bug ID: 754450
           Summary: Increase the limit of frequency and channel number for
                    audiotestsrc
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: cmertes at techfak.uni-bielefeld.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 310487
  --> https://bugzilla.gnome.org/attachment.cgi?id=310487&action=edit
The patch implementing the changes.

As discussed on
http://gstreamer-devel.966125.n4.nabble.com/Ultrasound-and-audiotestsrc-tt4673383.html
the limitation of generated frequencies to the audible range is not really
necessary and there are use cases where it might be desirable to be able to
produce ultrasound. Furthermore, the restriction to mono and stereo signals is
also a needless limitation.

I therefore created a patch that lifts both these limitations while also
extending the caps negotiation code to make sure that the sample rate is always
at least four times as high as the frequency that ought to be generated. The
reasons for this not being twice the frequency were mentioned on the list but
mainly boil down to avoiding artifacts or digital silence being generated with
certain wave forms at or close to the Nyquist frequency with existing code.

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