mirror of
https://github.com/asterisk/asterisk.git
synced 2025-09-23 14:44:28 +00:00
89e58f12a8
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
/*
|
|
* Asterisk -- A telephony toolkit for Linux.
|
|
*
|
|
* FSK Modem Support
|
|
*
|
|
* Copyright (C) 1999, Mark Spencer
|
|
*
|
|
* Mark Spencer <markster@linux-support.net>
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License.
|
|
*
|
|
* Includes code and algorithms from the Zapata library.
|
|
*
|
|
*/
|
|
|
|
#ifndef _FSKMODEM_H
|
|
#define _FSKMODEM_H
|
|
|
|
#define PARITY_NONE 0
|
|
#define PARITY_EVEN 1
|
|
#define PARITY_ODD 2
|
|
|
|
|
|
#define NCOLA 0x4000
|
|
|
|
typedef struct {
|
|
float spb; /* Samples / Bit */
|
|
int nbit; /* Number of Data Bits (5,7,8) */
|
|
float nstop; /* Number of Stop Bits 1,1.5,2 */
|
|
int paridad; /* Parity 0=none 1=even 2=odd */
|
|
int hdlc; /* Modo Packet */
|
|
float x0;
|
|
float x1;
|
|
float x2;
|
|
float cont;
|
|
int bw; /* Ancho de Banda */
|
|
double fmxv[8],fmyv[8]; /* filter stuff for M filter */
|
|
int fmp; /* pointer for M filter */
|
|
double fsxv[8],fsyv[8]; /* filter stuff for S filter */
|
|
int fsp; /* pointer for S filter */
|
|
double flxv[8],flyv[8]; /* filter stuff for L filter */
|
|
int flp; /* pointer for L filter */
|
|
int f_mark_idx; /* Indice de frecuencia de marca (f_M-500)/5 */
|
|
int f_space_idx;/* Indice de frecuencia de espacio (f_S-500)/5 */
|
|
int state;
|
|
int pcola; /* Puntero de las colas de datos */
|
|
float cola_in[NCOLA]; /* Cola de muestras de entrada */
|
|
float cola_filtro[NCOLA]; /* Cola de muestras tras filtros */
|
|
float cola_demod[NCOLA]; /* Cola de muestras demoduladas */
|
|
} fsk_data;
|
|
|
|
/* Retrieve a serial byte into outbyte. Buffer is a pointer into a series of
|
|
shorts and len records the number of bytes in the buffer. len will be
|
|
overwritten with the number of bytes left that were not consumed, and the
|
|
return value is as follows:
|
|
0: Still looking for something...
|
|
1: An output byte was received and stored in outbyte
|
|
-1: An error occured in the transmission
|
|
He must be called with at least 80 bytes of buffer. */
|
|
extern int fsk_serie(fsk_data *fskd, short *buffer, int *len, int *outbyte);
|
|
|
|
#endif
|