export large parts into renderlib to reuse them from the tracker-script

renderlib.py

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+#!/usr/bin/python3
+
+import os
+import sys
+import glob
+import math
+import shutil
+import errno
+from lxml import etree
+from xml.sax.saxutils import escape as xmlescape
+import cssutils
+import logging
+import subprocess
+from urllib.request import urlopen
+
+# Frames per second. Increasing this renders more frames, the avconf-statements would still need modifications
+fps = 25
+debug = False
+
+cssutils.ser.prefs.lineSeparator = ' '
+cssutils.log.setLevel(logging.FATAL)
+
+def loadProject(projectname):
+	sys.path.append(os.path.join(os.path.dirname(os.path.abspath(__file__)), projectname))
+	return __import__(projectname)
+
+# t: current time, b: begInnIng value, c: change In value, d: duration
+# copied from jqueryui
+def easeOutCubic(t, b, c, d):
+	t=float(t)/d-1
+	return c*((t)*t*t + 1) + b
+
+def easeInCubic(t, b, c, d):
+	t=float(t)/d
+	return c*(t)*t*t + b;
+
+def easeOutQuad(t, b, c, d):
+	t=float(t)/d
+	return -c *(t)*(t-2) + b;
+
+def easeLinear(t, b, c, d):
+	t=float(t)/d
+	return t*c+b
+
+class Rendertask:
+	def __init__(self, infile, sequence, parameters={}, outfile=None, workdir='.'):
+		self.infile =  infile
+		self.sequence = sequence
+		self.parameters = parameters
+		self.outfile = outfile
+		self.workdir = workdir
+
+	def fromtupel(tuple):
+		return Rendertask(tuple[0], tuple[2], tuple[3], tuple[1])
+
+	def ensure(input):
+		if isinstance(input, tuple):
+			return Rendertask.fromtupel(input)
+		elif isinstance(input, Rendertask):
+			return input
+		else:
+			return None
+
+# try to create all folders needed and skip, they already exist
+def ensurePathExists(path):
+	try:
+		os.makedirs(path)
+	except OSError as exception:
+		if exception.errno != errno.EEXIST:
+			raise
+
+# remove the files matched by the pattern
+def ensureFilesRemoved(pattern):
+	for f in glob.glob(pattern):
+		os.unlink(f)
+
+def rendertask(task):
+	# in debug mode we have no thread-worker which prints its progress
+	if debug:
+		print("generating {0} from {1}".format(task.outfile, task.infile))
+
+	# make sure a .frames-directory exists in out workdir
+	ensurePathExists(os.path.join(task.workdir, '.frames'))
+
+	# open and parse the input file
+	with open(os.path.join(task.workdir, task.infile), 'r') as fp:
+		svgstr = fp.read()
+		for key in task.parameters.keys():
+			svgstr = svgstr.replace(key, xmlescape(str(task.parameters[key])))
+
+		svg = etree.fromstring(svgstr.encode('utf-8'))
+
+	# frame-number counter
+	frameNr = 0
+
+	# iterate through the animation seqence frame by frame
+	# frame is a ... tbd
+	for frame in task.sequence():
+		# print a line for each and every frame generated
+		if debug:
+			print("frameNr {0:2d} => {1}".format(frameNr, frame))
+
+		# open the output-file (named ".gen.svg" in the workdir)
+		with open(os.path.join(task.workdir, '.gen.svg'), 'w') as fp:
+			# apply the replace-pairs to the input text, by finding the specified xml-elements by thier id and modify thier css-parameter the correct value
+			for replaceinfo in frame:
+				(id, type, key, value) = replaceinfo
+
+				for el in svg.findall(".//*[@id='"+id.replace("'", "\\'")+"']"):
+					if type == 'style':
+						style = cssutils.parseStyle( el.attrib['style'] if 'style' in el.attrib else '' )
+						style[key] = str(value)
+						el.attrib['style'] = style.cssText
+
+					elif type == 'attr':
+						el.attrib[key] = value
+
+			# write the generated svg-text into the output-file
+			fp.write( etree.tostring(svg, encoding='unicode') )
+
+		# invoke inkscape to convert the generated svg-file into a png inside the .frames-directory
+		errorReturn = subprocess.check_output('cd {0} && inkscape --export-png=.frames/{1:04d}.png .gen.svg 2>&1 >/dev/null'.format(task.workdir, frameNr), shell=True, universal_newlines=True)
+		if errorReturn != '':
+			print("inkscape exitted with error\n"+errorReturn)
+			sys.exit(42)
+
+		# increment frame-number
+		frameNr += 1
+
+
+
+	# remove the dv we are about to (re-)generate
+	ensureFilesRemoved(os.path.join(task.workdir, task.outfile))
+
+	# invoke avconv aka ffmpeg and renerate a lossles-dv from the frames
+	#  if we're not in debug-mode, suppress all output
+	os.system('cd {0} && ffmpeg -ar 48000 -ac 2 -f s16le -i /dev/zero -f image2 -i .frames/%04d.png -target pal-dv -aspect 16:9 -shortest "{1}"'.format(task.workdir, task.outfile) + ('' if debug else '>/dev/null 2>&1'))
+
+	# as before, in non-debug-mode the thread-worker does all progress messages
+	if debug:
+		print("cleanup")
+
+	# remove the .frames-dir with all frames in it
+	shutil.rmtree(os.path.join(task.workdir, '.frames'))
+
+	# remove the generated svg
+	ensureFilesRemoved(os.path.join(task.workdir, '.gen.svg'))
+
+
+# Download the Events-Schedule and parse all Events out of it. Yield a tupel for each Event
+def events(scheduleUrl, titlemap={}):
+	print("downloading pentabarf schedule")
+
+	# download the schedule
+	response = urlopen(scheduleUrl)
+
+	# read xml-source
+	xml = response.read()
+
+	# parse into ElementTree
+	schedule = etree.fromstring(xml)
+
+	# iterate all days
+	for day in schedule.iter('day'):
+		# iterate all rooms
+		for room in day.iter('room'):
+			# iterate events on that day in this room
+			for event in room.iter('event'):
+				# aggregate names of the persons holding this talk
+				personnames = []
+				if event.find('persons') is not None:
+					for person in event.find('persons').iter('person'):
+						personnames.append(person.text)
+
+				# yield a tupel with the event-id, event-title and person-names
+				yield {
+					'id': int(event.get('id')),
+					'title': titlemap[id] if id in titlemap else event.find('title').text,
+					'subtitle': event.find('subtitle').text if event.find('subtitle') is not None else '',
+					'persons': personnames,
+					'personnames': ', '.join(personnames)
+				}