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#!/usr/bin/perl -w
# Copyright 2007, 2008 Robert ("Bob") Igo of StormLogic, LLC and mythic.tv.
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
use Switch;
use Tweaker::Script;
package Tweaker::Script;
set_known_options( 'low', 'medium', 'high' );
# ??? Need to make this update a class variable so it only ever needs to run once.
sub determine_RAM_size() {
my $result = execute_shell_command("cat /proc/meminfo | grep MemTotal");
if ($result =~ m/.*MemTotal:\s*(\d+) .*/) {
return $1;
}
return 0;
}
# Try to implement the given option.
sub implement_option {
my($option) = @_;
$dbconnectionstring = get_mythtv_connection_string();
if (connect_to_db("DBI:mysql:$dbconnectionstring")) {
# MythTV's GUI allows setting this value in multiples of 4700kB.
# We will arbitrarily set the HDRingbufferSize to the value that is closest to
# 3.3% of the total RAM.
my $RAM_size = determine_RAM_size();
my $ringbuffer_size = int($RAM_size * 0.033 / 4700) * 4700;
change_or_make_setting('HDRingbufferSize', $ringbuffer_size) || exit -1;
# change any existing mplayer cache setting to one based on available RAM size
# We will arbitrarily set the cache size to 1/16 of available RAM
my $cachesize = int($RAM_size / 16);
execute_shell_command("sed -i 's/cache.*=.*/cache=$cachesize/g' /etc/mplayer/mplayer.conf") || exit -1;
} else {
exit -1; # You may not have to do this. It's only when you need to change MySQL settings for MythTV.
} # You may not have to do this. It's only when you need to change MySQL settings for MythTV.
disconnect_from_db(); # You may not have to do this. It's only when you need to change MySQL settings for MythTV.
}
# Poll the system to see what recommendationlevel the given option has on the system.
sub poll_options {
my($option) = @_;
my $fudge_factor = .985;
my $low_RAM = int($fudge_factor * 512*1024); # ~512MB
my $medium_RAM = int($fudge_factor * 1024*1024); # ~1GB
my $high_RAM = int($fudge_factor * 2048*1024); # ~2GB
threshold_test($option, determine_RAM_size(), "RAM", $low_RAM, $medium_RAM, $high_RAM);
}
# Unimplemented in 0.7
sub check_option {
help;
}
# Unimplemented in 0.7
sub count_iterations {
help;
}
process_parameters;
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