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/*
ACfax - Fax reception with X11-interface for amateur radio
Copyright (C) 1995-1998 Andreas Czechanowski, DL4SDC
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
andreas.czechanowski@ins.uni-stuttgart.de
*/
/*
* sblaster.h - header file for sblaster.c, that handles the dsp-interface
* for Linux.
*/
#define DSPDEV "/dev/dsp"
#define MIXDEV "/dev/mixer"
/* adjust the values below to your SoundBlaster to obtain fax-pictures
without azimut-errors. Adjustment can also be done in the program, and
you can enter the calculated frequency here. Accuracy should be about
+/- 0.01 Hz
*/
#define FM_SMPLF 4000.976
#define AM_SMPLF 4801.109
void interface_init(char **, int*);
void interface_stop(void);
void setup_mode(int, int, int, unsigned *);
void do_receive(void);
void do_transmit(void);
int signal_level(void);
void tune_frequency(unsigned);
extern int dspfd; /* file descriptor of /dev/dsp, used for select() */
extern int rx_level; /* audio frequency input level, from 0 to 255 */
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