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https://github.com/netfun2000/lcd4linux.git
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799b8e7819
very minor changes git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@270 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
135 lines
2.9 KiB
C
135 lines
2.9 KiB
C
/* $Id: dvb.c,v 1.7 2003/11/11 04:30:41 reinelt Exp $
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*
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* DVB specific functions
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*
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* Copyright 2003 Michael Reinelt <reinelt@eunet.at>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*
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* $Log: dvb.c,v $
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* Revision 1.7 2003/11/11 04:30:41 reinelt
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* very minor changes
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*
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* Revision 1.6 2003/10/05 17:58:50 reinelt
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* libtool junk; copyright messages cleaned up
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*
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* Revision 1.5 2003/08/08 23:08:38 reinelt
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* CVS Id and Log missing from dvb.{c,h}
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*
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*/
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/*
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* exported functions:
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*
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* DVB (int *strength, int *snr)
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* returns 0 if ok, -1 if error
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* sets *strength to the signal strength
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* sets *snr to the signal/noise ratio
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <time.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include "config.h"
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#include "debug.h"
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#ifndef HAVE_LINUX_DVB_FRONTEND_H
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#warning linux/dvb/frontend.h not found.
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#warning DVB client will be disabled.
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int DVB (double *strength, double *snr)
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{
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static int flag=0;
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if (flag==0) {
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error("lcd4linux has been compiled without DVB support");
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error("DVB client will be disabled");
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flag=1;
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}
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*strength=0.0;
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*snr=0.0;
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return 0;
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}
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#else
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#include <linux/dvb/frontend.h>
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#include "dvb.h"
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int DVB (double *strength, double *snr)
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{
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static time_t now=0;
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static int fd=-2;
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static double strength0=0.0;
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static double snr0=0.0;
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unsigned short raw_strength;
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unsigned short raw_snr;
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*strength=strength0;
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*snr=snr0;
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if (fd==-1) return -1;
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if (time(NULL)==now) return 0;
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time(&now);
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if (fd==-2) {
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fd = open("/dev/dvb/adapter0/frontend0", O_RDONLY);
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if (fd==-1) {
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error ("open(/dev/dvb/adapter0/frontend0) failed: %s", strerror(errno));
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return -1;
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}
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debug ("open (/dev/dvb/adapter0/frontend0)=%d", fd);
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}
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if (ioctl(fd, FE_READ_SIGNAL_STRENGTH, &raw_strength)!=0) {
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error("ioctl(FE_READ_SIGNAL_STRENGTH) failed: %s", strerror(errno));
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fd=-1;
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return -1;
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}
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if (ioctl(fd, FE_READ_SNR, &raw_snr)!=0) {
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error("ioctl(FE_READ_SNR) failed: %s", strerror(errno));
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fd=-1;
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return -1;
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}
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// Normalize to 1.0
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strength0=raw_strength/65535.0;
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snr0=raw_snr/65535.0;
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*strength=strength0;
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*snr=snr0;
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return 0;
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}
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#endif
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