I haven't programmed gstreammer with C++.
The plugin audiotestsrc is part of gst-plugins-base, so you need to have
gst-plugins-base installed. You can check if the plugin is available in your
system with:
gst-inspect-1.0 audiotestsrc
Partial output:
Plugin Details:
Name audiotestsrc
Description Creates audio test signals of given frequency and
volume
Filename
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstaudiotestsrc.so
Version 1.10.4
License LGPL
* Source module gst-plugins-base*
Source release date 2017-02-23
Binary package GStreamer Base Plugins (Debian)
Origin URL
http://packages.qa.debian.org/gst-plugins-base1.0--
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