/usr/include/spandsp/telephony.h is in libspandsp-dev 0.0.6~pre20-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 | /*
* SpanDSP - a series of DSP components for telephony
*
* telephony.h - some very basic telephony definitions
*
* Written by Steve Underwood <steveu@coppice.org>
*
* Copyright (C) 2003 Steve Underwood
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#if !defined(_SPANDSP_TELEPHONY_H_)
#define _SPANDSP_TELEPHONY_H_
#if defined(_M_IX86) || defined(_M_X64)
#if defined(LIBSPANDSP_EXPORTS)
#define SPAN_DECLARE(type) __declspec(dllexport) type __stdcall
#define SPAN_DECLARE_NONSTD(type) __declspec(dllexport) type __cdecl
#define SPAN_DECLARE_DATA __declspec(dllexport)
#else
#define SPAN_DECLARE(type) __declspec(dllimport) type __stdcall
#define SPAN_DECLARE_NONSTD(type) __declspec(dllimport) type __cdecl
#define SPAN_DECLARE_DATA __declspec(dllimport)
#endif
#elif defined(SPANDSP_USE_EXPORT_CAPABILITY) && (defined(__GNUC__) || defined(__SUNCC__))
#define SPAN_DECLARE(type) __attribute__((visibility("default"))) type
#define SPAN_DECLARE_NONSTD(type) __attribute__((visibility("default"))) type
#define SPAN_DECLARE_DATA __attribute__((visibility("default")))
#else
#define SPAN_DECLARE(type) /**/ type
#define SPAN_DECLARE_NONSTD(type) /**/ type
#define SPAN_DECLARE_DATA /**/
#endif
#define SAMPLE_RATE 8000
/* This is based on A-law, but u-law is only 0.03dB different */
#define DBM0_MAX_POWER (3.14f + 3.02f)
#define DBM0_MAX_SINE_POWER (3.14f)
/* This is based on the ITU definition of dbOv in G.100.1 */
#define DBOV_MAX_POWER (0.0f)
#define DBOV_MAX_SINE_POWER (-3.02f)
/*! \brief A handler for pure receive. The buffer cannot be altered. */
typedef int (span_rx_handler_t)(void *s, const int16_t amp[], int len);
/*! \brief A handler for receive, where the buffer can be altered. */
typedef int (span_mod_handler_t)(void *s, int16_t amp[], int len);
/*! \brief A handler for missing receive data fill-in. */
typedef int (span_rx_fillin_handler_t)(void *s, int len);
/*! \brief A handler for transmit, where the buffer will be filled. */
typedef int (span_tx_handler_t)(void *s, int16_t amp[], int max_len);
#define ms_to_samples(t) ((t)*(SAMPLE_RATE/1000))
#define us_to_samples(t) ((t)/(1000000/SAMPLE_RATE))
#if !defined(FALSE)
#define FALSE 0
#endif
#if !defined(TRUE)
#define TRUE (!FALSE)
#endif
#if defined(__cplusplus)
/* C++ doesn't seem to have sane rounding functions/macros yet */
#if !defined(WIN32)
#define lrint(x) ((long int) (x))
#define lrintf(x) ((long int) (x))
#endif
#endif
#endif
/*- End of file ------------------------------------------------------------*/
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