As usual Real actually took something existing and rebranded it.

Cook looks very much like G.722.1.

Originally committed as revision 8723 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/cook.c

@@ -23,7 +23,7 @@
 
 /**
  * @file cook.c
- * Cook compatible decoder.
+ * Cook compatible decoder. Bastardization of the G.722.1 standard.
  * This decoder handles RealNetworks, RealAudio G2 data.
  * Cook is identified by the codec name cook in RM files.
  *