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comparison spandsp-0.0.3/spandsp-0.0.3/src/lpc10_encdecs.h @ 5:f762bf195c4b
import spandsp-0.0.3
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 16:00:21 +0200 |
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4:26cd8f1ef0b1 | 5:f762bf195c4b |
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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 General Public License version 2, as | |
14 * 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 General Public License for more details. | |
20 * | |
21 * You should have received a copy of the GNU General Public License | |
22 * 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 1.9 2006/11/30 15:41:47 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 | |
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 ------------------------------------------------------------*/ |