1 /*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * lpc10_encdecs.h - LPC10 low bit rate speech codec.
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2006 Steve Underwood
9 *
10 * All rights reserved.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU Lesser General Public License version 2.1,
14 * as published by the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU Lesser General Public License for more details.
20 *
21 * You should have received a copy of the GNU Lesser General Public
22 * License along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * $Id: lpc10_encdecs.h,v 1.11 2008/04/17 14:26:56 steveu Exp $
26 */
27
28 #define LPC10_ORDER 10
29
30 #if !defined(min)
31 #define min(a,b) ((a) <= (b) ? (a) : (b))
32 #endif
33 #if !defined(max)
34 #define max(a,b) ((a) >= (b) ? (a) : (b))
35 #endif
36
37 void lpc10_placea(int32_t *ipitch,
38 int32_t voibuf[4][2],
39 int32_t *obound,
40 int32_t af,
41 int32_t vwin[3][2],
42 int32_t awin[3][2],
43 int32_t ewin[3][2],
44 int32_t lframe,
45 int32_t maxwin);
46
47 void lpc10_placev(int32_t *osbuf,
48 int32_t *osptr,
49 int32_t oslen,
50 int32_t *obound,
51 int32_t vwin[3][2],
52 int32_t af,
53 int32_t lframe,
54 int32_t minwin,
55 int32_t maxwin,
56 int32_t dvwinl,
57 int32_t dvwinh);
58
59 void lpc10_voicing(lpc10_encode_state_t *st,
60 int32_t *vwin,
61 float *inbuf,
62 float *lpbuf,
63 const int32_t buflim[],
64 int32_t half,
65 float *minamd,
66 float *maxamd,
67 int32_t *mintau,
68 float *ivrc,
69 int32_t *obound);
70
71 void lpc10_analyse(lpc10_encode_state_t *st, float *speech, int32_t *voice, int32_t *pitch, float *rms, float rc[]);
72
pow_ii(int32_t x,int32_t n)73 static __inline__ int32_t pow_ii(int32_t x, int32_t n)
74 {
75 int32_t pow;
76 uint32_t u;
77
78 if (n <= 0)
79 {
80 if (n == 0 || x == 1)
81 return 1;
82 if (x != -1)
83 return (x == 0) ? 1/x : 0;
84 n = -n;
85 }
86 u = n;
87 for (pow = 1; ; )
88 {
89 if ((u & 1))
90 pow *= x;
91 if ((u >>= 1) == 0)
92 break;
93 x *= x;
94 }
95 return pow;
96 }
97 /*- End of function --------------------------------------------------------*/
98
r_sign(float a,float b)99 static __inline__ float r_sign(float a, float b)
100 {
101 float x;
102
103 x = fabsf(a);
104 return (b >= 0.0f) ? x : -x;
105 }
106 /*- End of function --------------------------------------------------------*/
107 /*- End of file ------------------------------------------------------------*/
108