wmradio/radio.c

   1 /*
   2  * Copyright (C) 12 Jun 2003 Tomas Cermak
   3  *
   4  * This file is part of wmradio program.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/time.h>
  28 #include <sys/ioctl.h>
  29
  30 #include <linux/videodev.h>
  31
  32 char *device = "/dev/radio";
  33
  34 int get_freq_fact(int fd)
  35 {
  36     struct video_tuner tuner;
  37
  38     tuner.tuner = 0;
  39     if (ioctl (fd, VIDIOCGTUNER, &tuner) < 0)
  40         return 16;
  41     if ((tuner.flags & VIDEO_TUNER_LOW) == 0)
  42         return 16;
  43     return 16000;
  44 }
  45
  46 int radio_setfreq(int fd, int freq)
  47 {
  48     int ifreq = (freq/100.0+1.0/32.0)*get_freq_fact(fd);
  49     return ioctl(fd, VIDIOCSFREQ, &ifreq);
  50 }
  51
  52 void radio_unmute(int fd)
  53 {
  54     struct video_audio vid_aud;
  55
  56     if (ioctl(fd, VIDIOCGAUDIO, &vid_aud))
  57         perror("VIDIOCGAUDIO");
  58     if (vid_aud.volume == 0)
  59         vid_aud.volume = 65535;
  60     vid_aud.flags &= ~VIDEO_AUDIO_MUTE;
  61     if (ioctl(fd, VIDIOCSAUDIO, &vid_aud))
  62         perror("VIDIOCSAUDIO");
  63 }
  64
  65 void radio_mute(int fd)
  66 {
  67     struct video_audio vid_aud;
  68
  69     if (ioctl(fd, VIDIOCGAUDIO, &vid_aud))
  70         perror("VIDIOCGAUDIO");
  71     vid_aud.flags |= VIDEO_AUDIO_MUTE;
  72     if (ioctl(fd, VIDIOCSAUDIO, &vid_aud))
  73         perror("VIDIOCSAUDIO");
  74 }
  75
  76 int radio_getstereo(int fd)
  77 {
  78     struct video_audio va;
  79     va.mode=-1;
  80     if(ioctl(fd, VIDIOCGAUDIO, &va) < 0) return 0;
  81     return va.mode == VIDEO_SOUND_STEREO ? 1 : 0;
  82 }
  83
  84 int radio_getsignal(int fd)
  85 {
  86     struct video_tuner vt;
  87     int signal;
  88
  89     memset(&vt,0,sizeof(vt));
  90     ioctl (fd, VIDIOCGTUNER, &vt);
  91     signal=vt.signal>>13;
  92
  93     return signal;
  94 };
  95