#!/usr/bin/perl

use Video::Capture::V4l;

sub print_capability {
   my $c=shift;
   print "Device: ";
   print "name ",$c->name;
   print ", type";
   for (qw(capture tuner teletext overlay chromakey clipping frameram scales monochrome subcapture)) {
      print " $_" if eval "\$c->$_";
   }
   print ", channels ",$c->channels;
   print ", audios ",$c->audios;
   print ", sizes ",$c->minwidth,"x",$c->minheight,"-",$c->maxwidth,"x",$c->maxheight;
   print "\n";
}

sub print_channel {
   my $c=shift;
   print "Channel ",$c->channel,": ";
   print "name ",$c->name;
   print ", tuners ",$c->tuners;
   print ", flags";
   for (qw(tuner audio)) {
      print " $_" if eval "\$c->$_";
   }
   print ", type";
   for (qw(tv camera)) {
      print " $_" if eval "\$c->$_";
   }
   # PAL, NTSC, SECAM, PAL-NC, PAL-M, PAL-N, NTSC-Japan
   print ", norm ",$c->norm;
   print "\n";
}

sub print_tuner {
   my $c=shift;
   print "Tuner ",$c->tuner,": ";
   print "name ",$c->name;
   print ", range ",$c->rangelow,"-",$c->rangehigh;
   print ", flags";
   for (qw(pal ntsc secam low norm stereo_on rds_on mbs_on)) {
      print " $_" if eval "\$c->$_";
   }
   print ", mode ",$c->mode;
   print ", signal ",$c->signal;
   print "\n";
}

sub print_audio {
   my $c=shift;
   print "Audio Channel ",$c->audio,": ";
   print "volume ",$c->volume;
   print ", bass ",$c->bass;
   print ", treble ",$c->treble;
   print ", flags";
   for (qw(mute mutable volume bass treble)) {
      print " $_" if eval "\$c->$_";
   }
   print ", name ",$c->name;
   print ", mode ",$c->mode;
   print ", balance ",$c->balance;
   print ", step ",$c->step;
   print "\n";
}

sub print_picture {
   my $c=shift;
   print "Picture Settings: ";
   print "brightness ",$c->brightness;
   print ", hue ",$c->hue;
   print ", colour ",$c->colour;
   print ", contrast ",$c->contrast;
   print ", whiteness ",$c->whiteness;
   print ", depth ",$c->depth;
   print ", palette ",$c->palette;
   print "\n";
}

$grab = new Video::Capture::V4l
   or die "Unable to open Videodevice: $!";

print_capability $grab->capability;
for (0..$grab->capability->channels-1) {
   print_channel $grab->channel($_);
}

for($_=0; my $tuner = $grab->tuner($_); $_++) {
   last if $tuner->tuner != $_;
   print_tuner $tuner;
}

for($_=0; my $audio = $grab->audio($_); $_++) {
   last if $audio->audio != $_;
   print_audio $audio;
}

print_picture $grab->picture;

my $channel = $grab->channel (0);
my $tuner = $grab->tuner (0);
$tuner->mode(MODE_PAL);
$channel->norm(MODE_PAL);
$tuner->set;
$channel->set;

$RTL2 = 154250;

print $grab->freq ($RTL2),"\n";

$|=1;

my $frame=0;
my $fr=$grab->capture ($frame, 64, 48);

for(;;) {
   my $nfr = $grab->capture (1-$frame, 64, 48);
   $grab->sync($frame) or die "unable to sync";

   # save $fr now, as it contains the raw BGR data
   print ".";

   $frame = 1-$frame;
   $fr = $nfr;
}