cloud_laser/stupid_artnet/StupidArtnet.py

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"""(Very) Simple Implementation of Artnet.
Python Version: 3.6
Source: http://artisticlicence.com/WebSiteMaster/User%20Guides/art-net.pdf
http://art-net.org.uk/wordpress/structure/streaming-packets/artdmx-packet-definition/
NOTES
- For simplicity: NET and SUBNET not used by default but optional
"""
import socket
from threading import Timer
class StupidArtnet():
"""(Very) simple implementation of Artnet."""
UDP_PORT = 6454
def __init__(self, targetIP='127.0.0.1', universe=0, packet_size=512, fps=30, receiver_needs_even_packet_size=True, broadcast=False):
"""Class Initialization."""
# Instance variables
self.TARGET_IP = targetIP
self.SEQUENCE = 0
self.PHYSICAL = 0
self.UNIVERSE = universe
self.SUB = 0
self.NET = 0
self.PACKET_SIZE = self.put_in_range(packet_size, 2, 512, receiver_needs_even_packet_size)
self.HEADER = bytearray()
self.BUFFER = bytearray(self.PACKET_SIZE)
self.bMakeEven = receiver_needs_even_packet_size
self.bIsSimplified = True # simplify use of universe, net and subnet
# UDP SOCKET
self.s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
if broadcast:
self.s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
# Timer
self.fps = fps
self.make_header()
def __del__(self):
self.stop()
self.close()
def __str__(self):
"""Printable object state."""
s = "===================================\n"
s += "Stupid Artnet initialized\n"
s += "Target IP: %s:%i \n" % (self.TARGET_IP, self.UDP_PORT)
s += "Universe: %i \n" % self.UNIVERSE
if not (self.bIsSimplified):
s += "Subnet: %i \n" % self.SUB
s += "Net: %i \n" % self.NET
s += "Packet Size: %i \n" % self.PACKET_SIZE
s += "==================================="
return s
def make_header(self):
"""Make packet header."""
# 0 - id (7 x bytes + Null)
self.HEADER = bytearray()
self.HEADER.extend(bytearray('Art-Net', 'utf8'))
self.HEADER.append(0x0)
# 8 - opcode (2 x 8 low byte first)
self.HEADER.append(0x00)
self.HEADER.append(0x50) # ArtDmx data packet
# 10 - prototocol version (2 x 8 high byte first)
self.HEADER.append(0x0)
self.HEADER.append(14)
# 12 - sequence (int 8), NULL for not implemented
self.HEADER.append(self.SEQUENCE)
# 13 - physical port (int 8)
self.HEADER.append(0x00)
# 14 - universe, (2 x 8 low byte first)
if (self.bIsSimplified):
# not quite correct but good enough for most cases:
# the whole net subnet is simplified
# by transforming a single uint16 into its 8 bit parts
# you will most likely not see any differences in small networks
v = self.shift_this(self.UNIVERSE) # convert to MSB / LSB
self.HEADER.append(v[1])
self.HEADER.append(v[0])
# 14 - universe, subnet (2 x 4 bits each)
# 15 - net (7 bit value)
else:
# as specified in Artnet 4 (remember to set the value manually after):
# Bit 3 - 0 = Universe (1-16)
# Bit 7 - 4 = Subnet (1-16)
# Bit 14 - 8 = Net (1-128)
# Bit 15 = 0
# this means 16 * 16 * 128 = 32768 universes per port
# a subnet is a group of 16 Universes
# 16 subnets will make a net, there are 128 of them
self.HEADER.append(self.SUB << 4 | self.UNIVERSE)
self.HEADER.append(self.NET & 0xFF)
# 16 - packet size (2 x 8 high byte first)
v = self.shift_this(self.PACKET_SIZE) # convert to MSB / LSB
self.HEADER.append(v[0])
self.HEADER.append(v[1])
def show(self):
"""Finally send data."""
packet = bytearray()
packet.extend(self.HEADER)
packet.extend(self.BUFFER)
try:
self.s.sendto(packet, (self.TARGET_IP, self.UDP_PORT))
except Exception as e:
print("ERROR: Socket error with exception: %s" % e)
finally:
self.SEQUENCE = (self.SEQUENCE + 1) % 256
def close(self):
"""Close UDP socket."""
self.s.close()
##
# THREADING
##
def start(self):
"""Starts thread clock."""
self.show()
self.__clock = Timer((1000.0 / self.fps) / 1000.0, self.start)
self.__clock.daemon = True
self.__clock.start()
def stop(self):
"""Stops thread clock."""
try:
self.__clock.cancel()
except:
pass
##
# SETTERS - HEADER
##
def set_universe(self, universe):
"""Setter for universe (0 - 15 / 256).
Mind if protocol has been simplified
"""
# This is ugly, trying to keep interface easy
# With simplified mode the universe will be split into two
# values, (uni and sub) which is correct anyway. Net will always be 0
if (self.bIsSimplified):
self.UNIVERSE = self.put_in_range(universe, 0, 255, False)
else:
self.UNIVERSE = self.put_in_range(universe, 0, 15, False)
self.make_header()
def set_subnet(self, sub):
"""Setter for subnet address (0 - 15).
Set simplify to false to use
"""
self.SUB = self.put_in_range(sub, 0, 15, False)
self.make_header()
def set_net(self, net):
"""Setter for net address (0 - 127).
Set simplify to false to use
"""
self.NET = self.put_in_range(net, 0, 127, False)
self.make_header()
def set_packet_size(self, packet_size):
"""Setter for packet size (2 - 512, even only)."""
self.PACKET_SIZE = self.put_in_range(packet_size, 2, 512, self.bMakeEven)
self.make_header()
##
# SETTERS - DATA
##
def clear(self):
"""Clear DMX buffer."""
self.BUFFER = bytearray(self.PACKET_SIZE)
def set(self, p):
"""Set buffer."""
if len(self.BUFFER) != self.PACKET_SIZE:
print("ERROR: packet does not match declared packet size")
return
self.BUFFER = p
def set_16bit(self, address, value, high_first=False):
"""Set single 16bit value in DMX buffer."""
if address > self.PACKET_SIZE:
print("ERROR: Address given greater than defined packet size")
return
if address < 1 or address > 512 - 1:
print("ERROR: Address out of range")
return
value = self.put_in_range(value, 0, 65535, False)
# Check for endianess
if (high_first):
self.BUFFER[address - 1] = (value >> 8) & 0xFF # high
self.BUFFER[address] = (value) & 0xFF # low
else:
self.BUFFER[address - 1] = (value) & 0xFF # low
self.BUFFER[address] = (value >> 8) & 0xFF # high
def set_single_value(self, address, value):
"""Set single value in DMX buffer."""
if address > self.PACKET_SIZE:
print("ERROR: Address given greater than defined packet size")
return
if address < 1 or address > 512:
print("ERROR: Address out of range")
return
self.BUFFER[address - 1] = self.put_in_range(value, 0, 255, False)
def set_single_rem(self, address, value):
"""Set single value while blacking out others."""
if address > self.PACKET_SIZE:
print("ERROR: Address given greater than defined packet size")
return
if address < 1 or address > 512:
print("ERROR: Address out of range")
return
self.clear()
self.BUFFER[address - 1] = self.put_in_range(value, 0, 255, False)
def set_rgb(self, address, r, g, b):
"""Set RGB from start address."""
if address > self.PACKET_SIZE:
print("ERROR: Address given greater than defined packet size")
return
if address < 1 or address > 510:
print("ERROR: Address out of range")
return
self.BUFFER[address - 1] = self.put_in_range(r, 0, 255, False)
self.BUFFER[address] = self.put_in_range(g, 0, 255, False)
self.BUFFER[address + 1] = self.put_in_range(b, 0, 255, False)
##
# AUX
##
def set_simplified(self, bDoSimplify):
"""Builds Header accordingly.
True - Header sends 16 bit universe value (OK but incorrect)
False - Headers sends Universe - Net and Subnet values as protocol
It is recommended that you set these values with .set_net() and set_physical
"""
if (bDoSimplify == self.bIsSimplified):
return
self.bIsSimplified = bDoSimplify
self.make_header()
def see_header(self):
"""Show header values."""
print(self.HEADER)
def see_buffer(self):
"""Show buffer values."""
print(self.BUFFER)
def blackout(self):
"""Sends 0's all across."""
self.clear()
self.show()
def flash_all(self):
"""Sends 255's all across."""
packet = bytearray(self.PACKET_SIZE)
[255 for i in packet]
# for i in range(self.PACKET_SIZE):
# packet[i] = 255
self.set(packet)
self.show()
##
# UTILS
##
@staticmethod
def shift_this(number, high_first=True):
"""Utility method: extracts MSB and LSB from number.
Args:
number - number to shift
high_first - MSB or LSB first (true / false)
Returns:
(high, low) - tuple with shifted values
"""
low = (number & 0xFF)
high = ((number >> 8) & 0xFF)
if (high_first):
return((high, low))
else:
return((low, high))
print("Something went wrong")
return False
@staticmethod
def put_in_range(number, range_min, range_max, make_even=True):
"""Utility method: sets number in defined range.
Args:
number - number to use
range_min - lowest possible number
range_max - highest possible number
make_even - should number be made even
Returns:
number - number in correct range
"""
if (number < range_min):
number = range_min
if (number > range_max):
number = range_max
if (make_even and number % 2 != 0):
number += 1
return number
if __name__ == '__main__':
print("===================================")
print("Namespace run")
target_ip = '127.0.0.1' # typically in 2.x or 10.x range
universe = 15 # see docs
packet_size = 20 # it is not necessary to send whole universe
packet = bytearray(packet_size)
a = StupidArtnet(target_ip, universe, packet_size)
a.set_simplified(False)
a.set_net(129)
a.set_subnet(16)
print(a)
a.set_single_value(13, 255)
a.set_single_value(14, 100)
a.set_single_value(15, 200)
print("Sending values")
a.show()
a.see_buffer()
a.flash_all()
a.see_buffer()
a.show()
print("Values sent")
del a