1 /********************************************************************
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
9 * by the XIPHOPHORUS Company http://www.xiph.org/ *
11 ********************************************************************
13 function: LPC low level routines
14 last mod: $Id: lpc.h,v 1.19 2002/07/11 06:40:49 xiphmont Exp $
16 ********************************************************************/
21 #include "vorbis/codec.h"
24 typedef struct lpclook{
25 /* en/decode lookups */
33 extern void lpc_init(lpc_lookup *l,long mapped, int m);
34 extern void lpc_clear(lpc_lookup *l);
36 /* simple linear scale LPC code */
37 extern float vorbis_lpc_from_data(float *data,float *lpc,int n,int m);
38 extern float vorbis_lpc_from_curve(float *curve,float *lpc,lpc_lookup *l);
40 extern void vorbis_lpc_predict(float *coeff,float *prime,int m,