111 lines
4.7 KiB
C
111 lines
4.7 KiB
C
/*
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* SpanDSP - a series of DSP components for telephony
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*
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* telephony.h - some very basic telephony definitions
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*
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* Written by Steve Underwood <steveu@coppice.org>
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*
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* Copyright (C) 2003 Steve Underwood
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 2.1,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#if !defined(_SPANDSP_TELEPHONY_H_)
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#define _SPANDSP_TELEPHONY_H_
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#if defined(_M_IX86) || defined(_M_X64)
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#if defined(LIBSPANDSP_EXPORTS)
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#define SPAN_DECLARE(type) __declspec(dllexport) type __stdcall
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#define SPAN_DECLARE_NONSTD(type) __declspec(dllexport) type __cdecl
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#define SPAN_DECLARE_DATA __declspec(dllexport)
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#else
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#define SPAN_DECLARE(type) __declspec(dllimport) type __stdcall
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#define SPAN_DECLARE_NONSTD(type) __declspec(dllimport) type __cdecl
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#define SPAN_DECLARE_DATA __declspec(dllimport)
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#endif
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#elif defined(SPANDSP_USE_EXPORT_CAPABILITY) && (defined(__GNUC__) || defined(__SUNCC__))
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#define SPAN_DECLARE(type) __attribute__((visibility("default"))) type
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#define SPAN_DECLARE_NONSTD(type) __attribute__((visibility("default"))) type
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#define SPAN_DECLARE_DATA __attribute__((visibility("default")))
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#else
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#define SPAN_DECLARE(type) /**/ type
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#define SPAN_DECLARE_NONSTD(type) /**/ type
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#define SPAN_DECLARE_DATA /**/
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#endif
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#define SAMPLE_RATE 8000
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/* This is based on A-law, but u-law is only 0.03dB different */
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#define DBM0_MAX_POWER (3.14f + 3.02f)
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#define DBM0_MAX_SINE_POWER (3.14f)
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/* This is based on the ITU definition of dbOv in G.100.1 */
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#define DBOV_MAX_POWER (0.0f)
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#define DBOV_MAX_SINE_POWER (-3.02f)
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/*! \brief A handler for pure receive. The buffer cannot be altered. */
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typedef int (*span_rx_handler_t)(void *s, const int16_t amp[], int len);
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/*! \brief A handler for receive, where the buffer can be altered. */
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typedef int (*span_mod_handler_t)(void *s, int16_t amp[], int len);
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/*! \brief A handler for missing receive data fill-in. */
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typedef int (*span_rx_fillin_handler_t)(void *s, int len);
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/*! \brief A handler for transmit, where the buffer will be filled. */
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typedef int (*span_tx_handler_t)(void *s, int16_t amp[], int max_len);
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#define ms_to_samples(t) ((t)*(SAMPLE_RATE/1000))
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#define us_to_samples(t) ((t)/(1000000/SAMPLE_RATE))
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#if !defined(FALSE)
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#define FALSE 0
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#endif
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#if !defined(TRUE)
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#define TRUE (!FALSE)
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#endif
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/* Fixed point constant macros */
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#define FP_Q_9_7(x) ((int16_t) (128.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_8_8(x) ((int16_t) (256.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_7_9(x) ((int16_t) (512.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_6_10(x) ((int16_t) (1024.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_5_11(x) ((int16_t) (2048.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_4_12(x) ((int16_t) (4096.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_3_13(x) ((int16_t) (8192.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_2_14(x) ((int16_t) (16384.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_1_15(x) ((int16_t) (32768.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_9_23(x) ((int32_t) (65536.0*128.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_8_24(x) ((int32_t) (65536.0*256.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_7_25(x) ((int32_t) (65536.0*512.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_6_26(x) ((int32_t) (65536.0*1024.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_5_27(x) ((int32_t) (65536.0*2048.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_4_28(x) ((int32_t) (65536.0*4096.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_3_29(x) ((int32_t) (65536.0*8192.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_2_30(x) ((int32_t) (65536.0*16384.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#define FP_Q_1_31(x) ((int32_t) (65536.0*32768.0*x + ((x >= 0.0) ? 0.5 : -0.5)))
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#if defined(__cplusplus)
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/* C++ doesn't seem to have sane rounding functions/macros yet */
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#if !defined(WIN32)
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#define lrint(x) ((long int) (x))
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#define lrintf(x) ((long int) (x))
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#endif
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#endif
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#endif
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/*- End of file ------------------------------------------------------------*/
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