The ITU G.722 codec, encode and decode part.

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 /*
  * SpanDSP - a series of DSP components for telephony
  *
  * g722_decode.c - The ITU G.722 codec, decode part.
  *
  * Written by Steve Underwood &lt;steveu@coppice.org&gt;
  *
  * Copyright (C) 2005 Steve Underwood
  *
  *  Despite my general liking of the GPL, I place my own contributions
  *  to this code in the public domain for the benefit of all mankind -
  *  even the slimy ones who might try to proprietize my work and use it
  *  to my detriment.
  *
  * Based in part on a single channel G.722 codec which is:
  *
  * Copyright (c) CMU 1993
  * Computer Science, Speech Group
  * Chengxiang Lu and Alex Hauptmann
  * /