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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@255 65c4cc65-6c06-0410-ace0-fbb531ad65f3
64 lines
1.9 KiB
C
Executable File
64 lines
1.9 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* FSK Modem Support
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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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.
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*
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* Includes code and algorithms from the Zapata library.
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*
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*/
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#ifndef _FSKMODEM_H
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#define _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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/* Retrieve a serial byte into outbyte. 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, and the
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return value is as follows:
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0: Still looking for something...
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1: An output byte was received and stored in outbyte
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-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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extern int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte);
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#endif
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