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73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief FSK Modem Support
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* \note Includes code and algorithms from the Zapata library.
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* \todo Translate Emiliano Zapata's spanish comments to english, please.
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*/
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#ifndef _ASTERISK_FSKMODEM_H
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#define _ASTERISK_FSKMODEM_H
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#define PARITY_NONE 0
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#define PARITY_EVEN 1
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#define PARITY_ODD 2
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#define NCOLA 0x4000
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typedef struct {
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float spb; /*!< Samples / Bit */
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int nbit; /*!< Number of Data Bits (5,7,8) */
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float nstop; /*!< Number of Stop Bits 1,1.5,2 */
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int paridad; /*!< Parity 0=none 1=even 2=odd */
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int hdlc; /*!< Modo Packet */
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float x0;
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float x1;
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float x2;
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float cont;
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int bw; /*!< Ancho de Banda */
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double fmxv[8],fmyv[8]; /*!< filter stuff for M filter */
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int fmp; /*!< pointer for M filter */
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double fsxv[8],fsyv[8]; /*!< filter stuff for S filter */
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int fsp; /*!< pointer for S filter */
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double flxv[8],flyv[8]; /*!< filter stuff for L filter */
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int flp; /*!< pointer for L filter */
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int f_mark_idx; /*!< Indice de frecuencia de marca (f_M-500)/5 */
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int f_space_idx; /*!< Indice de frecuencia de espacio (f_S-500)/5 */
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int state;
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int pcola; /*!< Puntero de las colas de datos */
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float cola_in[NCOLA]; /*!< Cola de muestras de entrada */
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float cola_filtro[NCOLA]; /*!< Cola de muestras tras filtros */
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float cola_demod[NCOLA]; /*!< Cola de muestras demoduladas */
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} fsk_data;
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/* \brief Retrieve a serial byte into outbyte.
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Buffer is a pointer into a series of
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shorts and len records the number of bytes in the buffer. len will be
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overwritten with the number of bytes left that were not consumed.
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\return return value is as follows:
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\arg 0: Still looking for something...
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\arg 1: An output byte was received and stored in outbyte
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\arg -1: An error occured in the transmission
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He must be called with at least 80 bytes of buffer. */
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int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte);
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#endif /* _ASTERISK_FSKMODEM_H */
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