Mercurial > hg > audiostuff
comparison spandsp-0.0.6pre17/src/spandsp/telephony.h @ 4:26cd8f1ef0b1
import spandsp-0.0.6pre17
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 15:50:58 +0200 |
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3:c6c5a16ce2f2 | 4:26cd8f1ef0b1 |
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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 ------------------------------------------------------------*/ |