1 /********************************************************************
3 * THIS FILE IS PART OF THE Ogg Vorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
5 * THE GNU PUBLIC LICENSE 2, WHICH IS INCLUDED WITH THIS SOURCE. *
6 * PLEASE READ THESE TERMS DISTRIBUTING. *
8 * THE OggSQUISH SOURCE CODE IS (C) COPYRIGHT 1994-2000 *
9 * by Monty <monty@xiph.org> and The XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: LPC low level routines
15 last mod: $Id: lpc.h,v 1.10 2000/05/08 20:49:49 xiphmont Exp $
17 ********************************************************************/
22 #include "vorbis/codec.h"
25 typedef struct lpclook{
26 /* en/decode lookups */
34 extern void lpc_init(lpc_lookup *l,long mapped, int m);
35 extern void lpc_clear(lpc_lookup *l);
37 /* simple linear scale LPC code */
38 extern double vorbis_lpc_from_data(double *data,double *lpc,int n,int m);
39 extern double vorbis_lpc_from_curve(double *curve,double *lpc,lpc_lookup *l);
40 extern void vorbis_lpc_to_curve(double *curve,double *lpc,double amp,
43 /* standard lpc stuff */
44 extern void vorbis_lpc_residue(double *coeff,double *prime,int m,
46 extern void vorbis_lpc_predict(double *coeff,double *prime,int m,