Meta XR Audio Plug-in

The following component is licensed under FFTPACK License 2004 reproduced below:

  As confirmed by the NCAR fftpack software curators, the following
  FFTPACKv5 license applies to FFTPACKv4 sources. My changes are
  released under the same terms.

  FFTPACK license:

  http://www.cisl.ucar.edu/css/software/fftpack5/ftpk.html

  Copyright (c) 2004 the University Corporation for Atmospheric
  Research ("UCAR"). All rights reserved. Developed by NCAR's
  Computational and Information Systems Laboratory, UCAR,
  www.cisl.ucar.edu.

  Redistribution and use of the Software in source and binary forms,
  with or without modification, is permitted provided that the
  following conditions are met:

  - Neither the names of NCAR's Computational and Information Systems
  Laboratory, the University Corporation for Atmospheric Research,
  nor the names of its sponsors or contributors may be used to
  endorse or promote products derived from this Software without
  specific prior written permission.

  - Redistributions of source code must retain the above copyright
  notices, this list of conditions, and the disclaimer below.

  - Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions, and the disclaimer below in the
  documentation and/or other materials provided with the
  distribution.

  THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
  HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
  EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
  SOFTWARE.