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 1994-1999 *
9 * by 1999 Monty <monty@xiph.org> and The XIPHOPHORUS Company *
10 * http://www.xiph.org/ *
12 ********************************************************************
14 function: LPC low level routines
16 ********************************************************************/
23 extern void lpc_init(lpc_lookup *l,int n, int mapped,
24 int m, int oct, int encode_p);
25 extern void lpc_clear(lpc_lookup *l);
27 /* simple linear scale LPC code */
28 extern double vorbis_lpc_from_data(double *data,double *lpc,int n,int m);
29 extern double vorbis_lpc_from_spectrum(double *curve,double *lpc,lpc_lookup *l);
32 extern double vorbis_curve_to_lpc(double *curve,double *lpc,lpc_lookup *l);
33 extern void vorbis_lpc_to_curve(double *curve,double *lpc, double amp,
35 extern void vorbis_lpc_apply(double *residue,double *lpc, double amp,
38 /* standard lpc stuff */
39 extern void vorbis_lpc_residue(double *coeff,double *prime,int m,
41 extern void vorbis_lpc_predict(double *coeff,double *prime,int m,