spandsp  3.0.0
lpc10_encdecs.h
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 
26 #define LPC10_ORDER 10
27 #define LPC10_MAX_PITCH 20
28 #define LPC10_MIN_PITCH 156
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 
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 
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 ------------------------------------------------------------*/
Definition: private/lpc10.h:34