Mercurial > hg > audiostuff
view spandsp-0.0.3/spandsp-0.0.3/src/spandsp/telephony.h @ 5:f762bf195c4b
import spandsp-0.0.3
author | Peter Meerwald <pmeerw@cosy.sbg.ac.at> |
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date | Fri, 25 Jun 2010 16:00:21 +0200 |
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/* * 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 General Public License version 2, 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * $Id: telephony.h,v 1.9 2006/11/28 16:59:57 steveu Exp $ */ #if !defined(_TELEPHONY_H_) #define _TELEPHONY_H_ #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 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) #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 */ #ifndef _MSC_VER #define lrint(x) ((long int) (x)) #define lrintf(x) ((long int) (x)) #endif #endif #endif /*- End of file ------------------------------------------------------------*/