From b5d7f5c066d7ca666d63a71a57b8f9d65c739535 Mon Sep 17 00:00:00 2001
From: Jan Klopper <janklopper@innerheight.com>
Date: Wed, 2 Mar 2016 12:21:03 +0100
Subject: [PATCH] First version of PixelVloed, a UDP/Binary PixelFlut
 server/client

---
 client.py | 56 ++++++++++++++++++++++++++++++++++++++
 vloed.py  | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 137 insertions(+)
 create mode 100755 client.py
 create mode 100755 vloed.py

diff --git a/client.py b/client.py
new file mode 100755
index 0000000..476cc03
--- /dev/null
+++ b/client.py
@@ -0,0 +1,56 @@
+#!/usr/bin/python
+"""This is a udp / binary client
+
+Inspired by the PixelFlut beamer on eth0:winter 2016 and
+code from https://github.com/defnull/pixelflut/
+"""
+
+__version__ = 0.1
+__author__ = "Jan Klopper <jan@underdark.nl>"
+
+import socket
+import struct
+import random
+
+def RGBPixel(x, y, r, g, b, a=None): # pylint: disable=C0103
+  """Generates the packed data for a pixel"""
+  if a:
+    return struct.pack("<2H4B", x, y, r, g, b, a)
+  return struct.pack("<2H3B", x, y, r, g, b)
+
+def SetRGBAMode(mode):
+  """Generate the rgb/rgba bit"""
+  return struct.pack("<?", mode)
+
+def SetVersionBit(protocol=1):
+  """Generate the Version bit"""
+  return struct.pack("<B", protocol)
+
+def RandomFill(width=640, height=480):
+  """Generates a random number of pixels with a random color"""
+  message = SetRGBAMode(False)
+  message += SetVersionBit()
+  for pixel in xrange(0, random.randint(10, 100)):
+    message += RGBPixel(random.randint(0, width),
+                        random.randint(0, height),
+                        random.randint(0, 255),
+                        random.randint(0, 255),
+                        random.randint(0, 255))
+  return message
+
+def SendPacket(ipaddress, port, message):
+  """Sends the message to the udp server"""
+  sock = socket.socket(socket.AF_INET, # Internet
+                       socket.SOCK_DGRAM) # UDP
+  sock.sendto(message, (ipaddress, port))
+
+def main():
+  """Sends some random pixels untill we break with ctrl+c"""
+  ipaddress = "127.0.0.1"
+  port = 5005
+
+  while True:
+    SendPacket(ipaddress, port, RandomFill())
+
+if __name__ == '__main__':
+  main()
diff --git a/vloed.py b/vloed.py
new file mode 100755
index 0000000..2c38942
--- /dev/null
+++ b/vloed.py
@@ -0,0 +1,81 @@
+#!/usr/bin/python
+"""This is a udp / binary version of PixelFlut
+
+Inspired by the PixelFlut beamer on eth0:winter 2016 and
+code from https://github.com/defnull/pixelflut/
+"""
+
+__version__ = 0.1
+__author__ = "Jan Klopper <jan@underdark.nl>"
+
+import pygame
+import socket
+import struct
+
+def main():
+  """Runs a pixelvloed server"""
+  PixelVloed(debug=True)
+
+class PixelVloed(object):
+  """PixelVloed server class"""
+
+  def __init__(self, udp_ip="127.0.0.1", udp_port=5005, debug=False):
+    """Init the pixelVloed server"""
+    self.debug = debug
+    self.pixeloffset = 2
+    self.screen = None
+    self.canvas()
+    self.set_title()
+    self.Socket(udp_ip, udp_port)
+
+  @staticmethod
+  def set_title(text=None):
+    """Sets the window title"""
+    title = 'PixelVloed %0.02f' % __version__
+    if text:
+      title += ' ' + text
+    pygame.display.set_caption(title)
+
+  def canvas(self, width=640, height=480):
+    """Init the pygame canvas"""
+    pygame.init()
+    self.screen = pygame.display.set_mode((width, height))
+
+  def clear(self, r=0, g=0, b=0): # pylint: disable=C0103
+    """ Fill the entire screen with a solid colour (default: black)"""
+    self.screen.fill((r, g, b))
+
+  def Pixel(self, x, y, r, g, b, a=255): # pylint: disable=C0103
+    """Print a pixel to the screen"""
+    self.screen.set_at((x, y), (r, g, b, a))
+
+  def Socket(self, ipaddress, port):
+    """Sets up a udp listening socket and handles the incoming binary data"""
+    sock = socket.socket(socket.AF_INET, # Internet
+                         socket.SOCK_DGRAM) # UDP
+    sock.bind((ipaddress, port))
+
+    while True:
+      data, addr = sock.recvfrom(1024)
+      preamble = struct.unpack_from("<?", data)[0]
+      protocol = struct.unpack_from("<B", data, 1)[0]
+      pixellength = 7 #xx,yy,r,g,b
+      if preamble:
+        if self.debug:
+          print 'rgba mode for %s:%d' % (addr[0], addr[1])
+        pixellength = 8 #xx,yy,r,g,b,a
+      pixelcount = (len(data)-1) / pixellength
+      if self.debug:
+        print '%d pixels received, protocol V %d ' % (pixelcount, protocol)
+      for i in xrange(0, pixelcount):
+        pixel = struct.unpack_from(
+            ("<2H4B" if preamble else "<2H3B"),
+            data,
+            self.pixeloffset + (i*pixellength))
+        if self.debug:
+          print pixel
+        self.Pixel(*pixel)
+      pygame.display.flip()
+
+if __name__ == '__main__':
+  main()