spandsp 0.0.6

telephony.h
1/*
2 * SpanDSP - a series of DSP components for telephony
3 *
4 * telephony.h - some very basic telephony definitions
5 *
6 * Written by Steve Underwood <steveu@coppice.org>
7 *
8 * Copyright (C) 2003 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#if !defined(_SPANDSP_TELEPHONY_H_)
27#define _SPANDSP_TELEPHONY_H_
28
29#if defined(_M_IX86) || defined(_M_X64)
30#if defined(LIBSPANDSP_EXPORTS)
31#define SPAN_DECLARE(type) __declspec(dllexport) type __stdcall
32#define SPAN_DECLARE_NONSTD(type) __declspec(dllexport) type __cdecl
33#define SPAN_DECLARE_DATA __declspec(dllexport)
34#else
35#define SPAN_DECLARE(type) __declspec(dllimport) type __stdcall
36#define SPAN_DECLARE_NONSTD(type) __declspec(dllimport) type __cdecl
37#define SPAN_DECLARE_DATA __declspec(dllimport)
38#endif
39#elif defined(SPANDSP_USE_EXPORT_CAPABILITY) && (defined(__GNUC__) || defined(__SUNCC__))
40#define SPAN_DECLARE(type) __attribute__((visibility("default"))) type
41#define SPAN_DECLARE_NONSTD(type) __attribute__((visibility("default"))) type
42#define SPAN_DECLARE_DATA __attribute__((visibility("default")))
43#else
44#define SPAN_DECLARE(type) /**/ type
45#define SPAN_DECLARE_NONSTD(type) /**/ type
46#define SPAN_DECLARE_DATA /**/
47#endif
48
49#define SAMPLE_RATE 8000
50
51/* This is based on A-law, but u-law is only 0.03dB different */
52#define DBM0_MAX_POWER (3.14f + 3.02f)
53#define DBM0_MAX_SINE_POWER (3.14f)
54/* This is based on the ITU definition of dbOv in G.100.1 */
55#define DBOV_MAX_POWER (0.0f)
56#define DBOV_MAX_SINE_POWER (-3.02f)
57
58/*! \brief A handler for pure receive. The buffer cannot be altered. */
59 typedef int (span_rx_handler_t)(void *s, const int16_t amp[], int len);
60
61/*! \brief A handler for receive, where the buffer can be altered. */
62 typedef int (span_mod_handler_t)(void *s, int16_t amp[], int len);
63
64/*! \brief A handler for missing receive data fill-in. */
65 typedef int (span_rx_fillin_handler_t)(void *s, int len);
66
67/*! \brief A handler for transmit, where the buffer will be filled. */
68 typedef int (span_tx_handler_t)(void *s, int16_t amp[], int max_len);
69
70#define ms_to_samples(t) ((t)*(SAMPLE_RATE/1000))
71#define us_to_samples(t) ((t)/(1000000/SAMPLE_RATE))
72
73#if !defined(FALSE)
74#define FALSE 0
75#endif
76#if !defined(TRUE)
77#define TRUE (!FALSE)
78#endif
79
80/* Fixed point constant macros */
81#define FP_Q_9_7(x) ((int16_t) (128.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
82#define FP_Q_8_8(x) ((int16_t) (256.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
83#define FP_Q_7_9(x) ((int16_t) (512.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
84#define FP_Q_6_10(x) ((int16_t) (1024.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
85#define FP_Q_5_11(x) ((int16_t) (2048.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
86#define FP_Q_4_12(x) ((int16_t) (4096.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
87#define FP_Q_3_13(x) ((int16_t) (8192.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
88#define FP_Q_2_14(x) ((int16_t) (16384.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
89#define FP_Q_1_15(x) ((int16_t) (32768.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
90
91#define FP_Q_9_23(x) ((int32_t) (65536.0*128.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
92#define FP_Q_8_24(x) ((int32_t) (65536.0*256.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
93#define FP_Q_7_25(x) ((int32_t) (65536.0*512.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
94#define FP_Q_6_26(x) ((int32_t) (65536.0*1024.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
95#define FP_Q_5_27(x) ((int32_t) (65536.0*2048.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
96#define FP_Q_4_28(x) ((int32_t) (65536.0*4096.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
97#define FP_Q_3_29(x) ((int32_t) (65536.0*8192.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
98#define FP_Q_2_30(x) ((int32_t) (65536.0*16384.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
99#define FP_Q_1_31(x) ((int32_t) (65536.0*32768.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
100
101#if defined(__cplusplus)
102/* C++ doesn't seem to have sane rounding functions/macros yet */
103#if !defined(WIN32)
104#define lrint(x) ((long int) (x))
105#define lrintf(x) ((long int) (x))
106#endif
107#endif
108
109#endif
110/*- End of file ------------------------------------------------------------*/