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comparison spandsp-0.0.6pre17/src/spandsp/telephony.h @ 4:26cd8f1ef0b1

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import spandsp-0.0.6pre17
author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Fri, 25 Jun 2010 15:50:58 +0200
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3:c6c5a16ce2f2 4:26cd8f1ef0b1
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 * $Id: telephony.h,v 1.18.4.2 2009/12/21 18:38:06 steveu Exp $
26 */
27
28 #if !defined(_SPANDSP_TELEPHONY_H_)
29 #define _SPANDSP_TELEPHONY_H_
30
31 #if defined(_M_IX86) || defined(_M_X64)
32 #if defined(LIBSPANDSP_EXPORTS)
33 #define SPAN_DECLARE(type) __declspec(dllexport) type __stdcall
34 #define SPAN_DECLARE_NONSTD(type) __declspec(dllexport) type __cdecl
35 #define SPAN_DECLARE_DATA __declspec(dllexport)
36 #else
37 #define SPAN_DECLARE(type) __declspec(dllimport) type __stdcall
38 #define SPAN_DECLARE_NONSTD(type) __declspec(dllimport) type __cdecl
39 #define SPAN_DECLARE_DATA __declspec(dllimport)
40 #endif
41 #elif defined(SPANDSP_USE_EXPORT_CAPABILITY) && (defined(__GNUC__) || defined(__SUNCC__))
42 #define SPAN_DECLARE(type) __attribute__((visibility("default"))) type
43 #define SPAN_DECLARE_NONSTD(type) __attribute__((visibility("default"))) type
44 #define SPAN_DECLARE_DATA __attribute__((visibility("default")))
45 #else
46 #define SPAN_DECLARE(type) /**/ type
47 #define SPAN_DECLARE_NONSTD(type) /**/ type
48 #define SPAN_DECLARE_DATA /**/
49 #endif
50
51 #define SAMPLE_RATE 8000
52
53 /* This is based on A-law, but u-law is only 0.03dB different */
54 #define DBM0_MAX_POWER (3.14f + 3.02f)
55 #define DBM0_MAX_SINE_POWER (3.14f)
56 /* This is based on the ITU definition of dbOv in G.100.1 */
57 #define DBOV_MAX_POWER (0.0f)
58 #define DBOV_MAX_SINE_POWER (-3.02f)
59
60 /*! \brief A handler for pure receive. The buffer cannot be altered. */
61 typedef int (span_rx_handler_t)(void *s, const int16_t amp[], int len);
62
63 /*! \brief A handler for receive, where the buffer can be altered. */
64 typedef int (span_mod_handler_t)(void *s, int16_t amp[], int len);
65
66 /*! \brief A handler for missing receive data fill-in. */
67 typedef int (span_rx_fillin_handler_t)(void *s, int len);
68
69 /*! \brief A handler for transmit, where the buffer will be filled. */
70 typedef int (span_tx_handler_t)(void *s, int16_t amp[], int max_len);
71
72 #define ms_to_samples(t) ((t)*(SAMPLE_RATE/1000))
73 #define us_to_samples(t) ((t)/(1000000/SAMPLE_RATE))
74
75 #if !defined(FALSE)
76 #define FALSE 0
77 #endif
78 #if !defined(TRUE)
79 #define TRUE (!FALSE)
80 #endif
81
82 #if defined(__cplusplus)
83 /* C++ doesn't seem to have sane rounding functions/macros yet */
84 #if !defined(WIN32)
85 #define lrint(x) ((long int) (x))
86 #define lrintf(x) ((long int) (x))
87 #endif
88 #endif
89
90 #endif
91 /*- End of file ------------------------------------------------------------*/

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