path: root/rcaudio/bvcommon.h (plain)
blob: 1316d8495eee2b64b6064d19372c389aec1864a3

1	/*****************************************************************************/
2	/* BroadVoice(R)32 (BV32) Floating-Point ANSI-C Source Code */
3	/* Revision Date: October 5, 2012 */
4	/* Version 1.2 */
5	/*****************************************************************************/
6
7	/*****************************************************************************/
8	/* Copyright 2000-2012 Broadcom Corporation */
9	/* */
10	/* This software is provided under the GNU Lesser General Public License, */
11	/* version 2.1, as published by the Free Software Foundation ("LGPL"). */
12	/* This program is distributed in the hope that it will be useful, but */
13	/* WITHOUT ANY SUPPORT OR WARRANTY; without even the implied warranty of */
14	/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the LGPL for */
15	/* more details. A copy of the LGPL is available at */
16	/* http://www.broadcom.com/licenses/LGPLv2.1.php, */
17	/* or by writing to the Free Software Foundation, Inc., */
18	/* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19	/*****************************************************************************/
20
21
22	/*****************************************************************************
23	bvcommon.h : Common #defines and prototypes
24
25	$Log$
26	******************************************************************************/
27
28	#ifndef BVCOMMON_H
29	#define BVCOMMON_H
30
31	/* Function Prototypes */
32
33
34	void pp3dec(
35	short idx,
36	Float *b);
37
38	void apfilter(
39	Float *a, /* (i) a[m+1] prediction coefficients (m=10) */
40	int m, /* (i) LPC order */
41	Float *x, /* (i) input signal */
42	Float *y, /* (o) output signal */
43	int lg, /* (i) size of filtering */
44	Float *mem, /* (i/o) input memory */
45	short update);/* (i) flag for memory update */
46
47	void azfilter(
48	Float *a, /* (i) prediction coefficients */
49	int m, /* (i) LPC order */
50	Float *x, /* (i) input signal vector */
51	Float *y, /* (o) output signal vector */
52	int lg, /* (i) size of filtering */
53	Float *mem, /* (i/o) filter memory before filtering */
54	short update); /* (i) flag for memory update */
55
56	void Autocor(
57	Float *r, /* (o) : Autocorrelations */
58	Float *x, /* (i) : Input signal */
59	Float *window, /* (i) : LPC Analysis window */
60	int l_window,/* (i) : window length */
61	int m); /* (i) : LPC order */
62
63	void Levinson(
64	Float *r, /* (i): autocorrelation coefficients */
65	Float *a, /* (o): LPC coefficients */
66	Float *old_a, /* (i/o): LPC coefficients of previous frame */
67	int m); /* (i): LPC order */
68
69	void a2lsp(
70	Float pc[], /* (i) input the np+1 predictor coeff. */
71	Float lsp[], /* (o) line spectral pairs */
72	Float old_lsp[]); /* (i/o) old lsp[] (in case not found 10 roots) */
73
74	void lsp2a(
75	Float *lsp, /* (i) LSP vector */
76	Float *a); /* (o) LPC coefficients */
77
78	void stblz_lsp(Float *lsp, int order);
79	int stblchck(Float *x, int vdim);
80
81	/* LPC to LSP Conversion */
82	extern Float grid[];
83
84	/* LPC bandwidth expansion */
85	extern Float bwel[];
86
87	/* LPC WEIGHTING FILTER */
88	extern Float STWAL[];
89
90	/* ----- Basic Codec Parameters ----- */
91	#define LPCO 8 /* LPC Order */
92	#define Ngrd 60 /* LPC to LSP Conversion */
93
94	#define LSPMIN 0.00150f /* minimum lsp frequency, 6/12 Hz for BV16/BV32 */
95	#define LSPMAX 0.99775f /* maximum lsp frequency, 3991/7982 Hz for BV16/BV32 */
96	#define DLSPMIN 0.01250f /* minimum lsp spacing, 50/100 Hz for BV16/BV32 */
97	#define STBLDIM 3 /* dimension of stability enforcement */
98
99	extern Float pp9cb[];
100
101	#endif /* BVCOMMON_H */
102
103