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"""Simple high-performance Open Pixel Control client."""
#
# Copyright (c) 2013 Micah Elizabeth Scott
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import json
import numpy
import os
import socket
import struct
import time
class FastOPC(object):
"""High-performance Open Pixel Control client, using Numeric Python.
By default, assumes the OPC server is running on localhost. This may be overridden
with the OPC_SERVER environment variable, or the 'server' keyword argument.
"""
def __init__(self, server=None):
self.server = server or os.getenv('OPC_SERVER') or '127.0.0.1:7890'
self.host, port = self.server.split(':')
self.port = int(port)
self.socket = None
def send(self, packet):
"""Send a low-level packet to the OPC server, connecting if necessary
and handling disconnects. Returns True on success.
"""
if self.socket is None:
try:
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.connect((self.host, self.port))
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, True)
except socket.error:
self.socket = None
if self.socket is not None:
try:
self.socket.send(packet)
return True
except socket.error:
self.socket = None
# Limit CPU usage when polling for a server
time.sleep(0.1)
return False
def putPixels(self, channel, *sources):
"""Send a list of 8-bit colors to the indicated channel. (OPC command 0x00).
This command accepts a list of pixel sources, which are concatenated and sent.
Pixel sources may be:
- Strings or buffer objects containing pre-formatted 8-bit RGB pixel data
- NumPy arrays or sequences containing 8-bit RGB pixel data.
If values are out of range, the array is modified.
"""
parts = []
bytes = 0
for source in sources:
if isinstance(source, buffer):
source = str(source)
elif not isinstance(source, str):
if not isinstance(source, numpy.ndarray):
source = numpy.array(source)
numpy.clip(source, 0, 255, source)
source = source.astype('B').tostring()
bytes += len(source)
parts.append(source)
parts.insert(0, struct.pack('>BBH', channel, 0, bytes))
self.send(''.join(parts))
def sysEx(self, systemId, commandId, msg):
self.send(struct.pack(">BBHHH", 0, 0xFF, len(msg) + 4, systemId, commandId) + msg)
def setGlobalColorCorrection(self, gamma, r, g, b):
self.sysEx(1, 1, json.dumps({'gamma': gamma, 'whitepoint':[r,g,b]}))