Working codec2 support

libs/libcodec2/src/lpc.h

@@ -0,0 +1,42 @@
+/*---------------------------------------------------------------------------*\
+                                                                           
+  FILE........: lpc.h                                                            
+  AUTHOR......: David Rowe                                                      
+  DATE CREATED: 24/8/09                                                   
+                                                                          
+  Linear Prediction functions written in C.                                
+                                                                          
+\*---------------------------------------------------------------------------*/
+
+/*
+  Copyright (C) 2009 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  This program is
+  distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+  License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with this program; if not, write to the Free Software
+  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef __LPC__
+#define __LPC__
+
+#define LPC_MAX_ORDER 20
+
+void hanning_window(float Sn[],	float Wn[], int Nsam);
+void autocorrelate(float Sn[], float Rn[], int Nsam, int order);
+void levinson_durbin(float R[],	float lpcs[], int order);
+void inverse_filter(float Sn[], float a[], int Nsam, float res[], int order);
+void synthesis_filter(float res[], float a[], int Nsam,	int order, float Sn_[]);
+void find_aks(float Sn[], float a[], int Nsam, int order, float *E);
+void weight(float ak[],	float gamma, int order,	float akw[]);
+
+#endif