Now i’m working in the Full Circle Magazine Notifier to run on Fedora distro’s, Full Circle is a great Ubuntu magazine that every linux dude has to read.
Some screenshots:
Full Circle Notifier Running
Full Circle i686 RPM
Currently now the project is in development, more news about this follow the blog.
Have to explain the code ? :
# Author:Alexis Tejeda <alexis.tejeda@gmail.com>
# Copyright: Alexis Tejeda - www.backorg.com
# License: GPLv3
# Date: Sep, 17 2009
#
# 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/>.
#
# About to: This program is capable to connect to a DLink IP camera
# DCS-2102 through HTTP to get the images or frame of the camera
# streaming in multipart/x-mixed-replace format.
#OpenCV Cameron Test Python Dependencies
from opencv import highgui
from opencv.highgui import cvNamedWindow, cvCreateCameraCapture, cvShowImage,\
cvQueryFrame, cvSetCaptureProperty, cvWaitKey
from opencv.cv import cvGetSize
i = 0
win = 'OpenCVTest'
camera = cvCreateCameraCapture(0)
cvNamedWindow(win, highgui.CV_WINDOW_AUTOSIZE)
cvSetCaptureProperty(camera, highgui.CV_CAP_PROP_FRAME_WIDTH, 640)
cvSetCaptureProperty(camera, highgui.CV_CAP_PROP_FRAME_HEIGHT, 480)
while 1:
frame = cvQueryFrame(camera)
cvShowImage(win, frame)
if frame is None:
break
k = cvWaitKey(10)
if k == 0x1b: # ESC
print 'ESC pressed. Exiting ...'
break
Working on my project, i decided to use ruby on rails or python as the system back end, for that reason i have to make a driver for the Dlink IP Camera in ruby and python that connects to the camera and get the jpg streaming frames..
The usage is very simple, just create the object and connect, instantly would be downloading the images on your file system like this…
c = BaseDlinkDriver('admin','cameron1', 'http://my.url.com:80/video/mjpg.cgi')
c.get_frames
'''Driver for DLink IP Camera DCS-2102'''
# Author:Alexis Tejeda
# Copyright: Alexis Tejeda - www.backorg.com
# License: GPLv3
# Date: Sep, 17 2009
#
# 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 .
#
# About to: This program is capable to connect to a DLink IP camera
# DCS-2102 through HTTP to get the images or frame of the camera
# streaming in multipart/x-mixed-replace format.
import time
import urllib2
from urllib2 import HTTPError
class BaseDlinkDriver:
"""Class Driver for DLink IP Camera DCS-2102"""
def __init__(self, user, password, uri):
"""Constructor"""
self.user = user
self.password = password
self.uri = uri
self.auth = None
self.http = None
self.setup_connection()
self.last_frame_time = time.time()
self.iterator = 0
self.events = []
self.fps = None
self.frame = None
def setup_connection(self):
"""Setup the initial connection"""
self.auth = urllib2.HTTPPasswordMgrWithDefaultRealm()
self.auth.add_password(None, self.uri, self.user, self.password)
handler = urllib2.HTTPBasicAuthHandler(self.auth)
opener = urllib2.build_opener(handler)
opener.open(self.uri)
urllib2.install_opener(opener)
def get_frame(self):
"""Get the camera frame, return the binary data in a byte array"""
try:
response = urllib2.urlopen(self.uri)
content_length = None
#find the content length
while 1:
line = response.readline()
if line.split(':')[0] == "Content-Length":
content_length = line
response.readline()
break
frame_length = int(content_length.strip().split()[1])
self.frame = response.read(frame_length)
self.calculateFPS()
return list(bytearray(self.frame))
except HTTPError, exception:
print exception.code
return None
def calculateFPS(self):
"""Calc the fps per second"""
self.fps = round((1/(time.time() - self.last_frame_time)),2)
self.last_frame_time = time.time()
Install OpenCV devel librarys.
1 | [atejeda@backorg ~]$ sudo yum install opencv-devel -y |
The edit your bash profile adding this line in the end of the file (in this case edited with VI).
1 2 | [atejeda@backorg ~]$ vi ~/.bash_profile export LD_LIBRARY_PATH=/usr/lib:$LD_LIBRARY_PATH |
Then include in uour script the header files located in :
/usr/include/opencv/
Once you have installed Fedora 13 in your computer, you will notice that they are no media support, so you will have to install some repositories (Livna, Rpm-fusion free and non free) list for download codecs, apps, etc.. etc..:
Open a terminal or console and install the RPM under superuser(su) or sudo mode :
RPM FUSION (also for F11, F12)
su -c 'rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm' su -c 'rpm -Uvh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm'
LIVNA
su -c 'rpm -Uvh http://rpm.livna.org/repo/13/i386/livna-release-1-1.noarch.rpm' su -c 'rpm -Uvh http://rpm.livna.org/repo/13/i386/libdvdcss-1.2.10-1.i386.rpm'
Update with : yum update, and that’s it, the repositories are for 32 or i386 machines.
Install the passenger gem in ruby:
[atejeda@backorg ~]$ sudo gem install passenger
Install the passenger apache module:
[atejeda@backorg ~]$ sudo passenger-install-apache2-module
Add this lines to httpd.conf:
LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-2.2.15/ext/apache2/mod_passenger.so PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-2.2.15 PassengerRuby /usr/bin/ruby
Add a virtual host in httpd.conf (example):
<virtualhost *:80 >
ServerName atejeda.backorg.com
DocumentRoot /var/www/html
# RailsEnv development
# RailsBaseURI /atejeda
<Directory /var/www/html>
# AllowOverride all
# Options -MultiViews
Options Indexes FollowSymLinks
Order allow,deny
Allow from all
</Directory>
RailsBaseURI /atejeda
<Directory /var/www/html/atejeda>
Options -MultiViews
</Directory>
</virtualhost>
Create the symbolic link
[atejeda@backorg ~]$ ln -s /home/atejeda/www/blogs/public /var/www/html/blog
Restart the service (graceful o full restart):
[atejeda@backorg ~]$ sudo service httpd graceful
or
[atejeda@backorg ~]$ sudo service httpd restart
An important note: This only works when the ruby app is in the production enviroment !!.
And config the SELinux to Permissive or Disable, how to to this: http://www.crypt.gen.nz/selinux/disable_selinux.html
More info can be found: http://www.modrails.com/documentation/Users%20guide%20Apache.html
Symlink problem fix: http://www.zsoltmolnar.hu/blog/tech/2006/07/symbolic-link-not-allowed-or-link.html
A good syadmin, always check the log’s file, check yours in case of any errors.
Axel is a download accelerator for linux, it’s almost the same like wget, but, makes 3 or 4 connections to download a file.
So, i have a bunch URL in a text file, that i want download, so, i’ve created a ruby script to download each file with axel.
1 2 3 4 5 6 7 8 9 | #!/usr/bin/env ruby begin file = File.new(ARGV[0], "r") while (line = file.gets) system("axel -a #{line}") end rescue puts "Theres a problem to open the file..." end |
Easy to use :
1 | ./downloader.rb MyTexFileWithURL.txt |
