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piconlinks.py
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piconlinks.py
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#!/usr/bin/env python2
# -*- coding: utf-8 -*-
import argparse
import os, os.path
import re
import sys
class Channels(object):
""" Holds all the information and routines related to
linking VDR channels to picons via their respective
servicerefs. """
channels = []
def __init__(self, channels_conf = '/etc/vdr/channels.conf', tvonly = False,
provider_name = None):
""" Initialize, read and store the channels from
a given channels.conf. """
self.tvonly = tvonly
self.provider_name = provider_name
try:
# Open channels.conf
channelsFile = open(channels_conf, 'r')
except IOError:
# Not found / not accessible
sys.exit ('ERROR: Could open %s' % channels_conf)
# Determine name and parameters for each channel and
# place that info in the channels list.
for channelLine in channelsFile:
# Break down a line from channels.conf and remove
# leading and trailing whitespace (if any)
channelSplit = [x.strip() for x in channelLine.split(':')]
# Add to channels list.
# Skip '(null)' provider name (Data channels, ...)
if ((channelSplit[0] is not None)
and (len(channelSplit) == 13) and channelSplit[0]
and (';' in channelSplit[0])
and not (channelSplit[0].split(';')[1] == '(null)')):
self.channels.append((channelSplit[0], channelSplit[1:],))
def simplenames(self):
""" Provides a dictionary of
('Channel name': 'simplechannelname')
items, e.g.
('Das Erste HD;ARD': 'daserstehd') """
simpleNames = dict()
for (channelName, channelParams) in self.channels:
# Skip channels with "empty" vpid (i.e. radio),
# if 'self.tvonly' flag is set.
if (channelParams[4] == '0' or channelParams[4] == '1') and self.tvonly:
continue
## Now start simplifiying
# Cut off provider names.
(cname, provider) = channelName.rsplit(';', 1)
# Simplify.
cname = re.sub('\s', '', cname.lower())
# Add to dictionary
simpleNames[channelName] = cname
return simpleNames
def servicerefs(self):
""" Provides a dictionary of
('Channel name': 'serviceref')
items, e.g.
('Das Erste HD;ARD': '1_0_19_2B5C_41B_A401_FFFF0000_0_0_0') """
def _createserviceref(source, freq, vpid, sid, nid, tid):
""" Subroutine for creating a single service reference.
All credit to pipelka (https://github.com/pipelka). """
# Analyze the 'vpid' as early as possible to skip unwanted
# channels (e.g. set by 'self.tvonly' more quickly).
type = 1
if (vpid == '0') or (vpid == '1'):
# Skip channels of type '2', if 'self.tvonly' is set.
if self.tvonly:
return
type = 2
# usually (on Enigma) the frequency is part of the namespace
# for picons this seems to be unused, so disable it by now
freq = 0;
if source.startswith('S'):
negative = False
source = source[1:]
if source.endswith('E'):
negative = True
source = source[:-1]
if '.' in source:
(number, decimal) = source.split('.')
position = 10 * int(number) + int(decimal)
if negative:
position = -position
if position > 0x00007FFF:
position |= 0xFFFF0000
if position < 0:
position = -position
else:
position = 1800 + position
hash = position << 16 | ((freq / 1000) & 0xFFFF)
elif source.startswith('C'):
hash = 0xFFFF0000 | ((freq / 1000) & 0xFFFF)
elif source.startswith('T'):
hash = 0xEEEE0000 | ((freq / 1000000) & 0xFFFF)
if '=' in vpid:
(pid, streamtype) = [x.strip() for x in vpid.split('=')]
if streamtype == '2':
type = 1
if streamtype == '27':
type = 19
return '1_0_%i_%X_%X_%X_%X_0_0_0' % (
type,
sid,
tid,
nid,
hash
)
serviceRefs = dict()
for (channelName, channelParams) in self.channels:
# Determine serviceref and fill dictionary.
serviceRef = _createserviceref(
channelParams[2],
int(channelParams[0]),
channelParams[4],
int(channelParams[8]),
int(channelParams[9]),
int(channelParams[10]))
# A skipped channel (e.g. with 'self.tvonly') would return
# None for serviceref. Don't add those to the dictionary
if serviceRef is not None:
serviceRefs[channelName] = serviceRef
return serviceRefs
class PIcons(Channels):
""" Find all available picons in a given path and determine
the channels that can be linked automatically. """
picons = []
def __init__(self, channels_conf = '/etc/vdr/channels.conf', tvonly = False,
provider_name = None, picons_dir = './picons'):
self.piconsDir = picons_dir
# Initialize superclass
super(PIcons, self).__init__(channels_conf = channels_conf,
tvonly = tvonly, provider_name = provider_name)
try:
# List directory containing picons.
piconDirList = os.listdir(picons_dir)
except OSError:
# Not found / not accessible.
sys.exit ('ERROR: Could open %s' % picons_dir)
# Filter for '.png' files.
def png(x):
return x.endswith('.png')
piconDirList = filter(png, piconDirList)
# Eliminate existing symlinks.
def nosymlink(x):
return not os.path.islink(os.path.join(picons_dir, x))
piconDirList = filter(nosymlink, piconDirList)
if piconDirList == []:
# Empty directory or no '.png' files
sys.exit ('ERROR: The directory %s does not contain any picons.' % picons_dir)
# Fill class variable
self.picons = [x[:-4] for x in piconDirList]
def lnscript(self):
""" Finally, create mapping between picon and serviceref.
Return the result in form of a shell script. """
print '#!/bin/bash'
links = dict()
unmatched = []
simpleNames = self.simplenames()
serviceRefs = self.servicerefs()
# Find matches (sorted by simplenames)
for (channelName, simpleName) in (
sorted(simpleNames.iteritems(), key=lambda (k,v): (v,k))):
unmatched.append(channelName)
# Print out shell script
if self.provider_name is not None:
print '# %s\n' % self.provider_name
for (src, dst) in sorted(links.iteritems()):
(channelName, serviceRef) = dst
print '# %s' % channelName
print 'ln -s %s.png %s.png' % (src, channelName.replace(",",";").split(';')[0].replace(" ","\\ "))
# Print unmatched
if unmatched != []:
print '# create symbolic links'
for channelName in unmatched:
try:
fileLink = os.readlink('%s/%s.png' % (self.piconsDir,serviceRefs[channelName]),)
"""print 'File: %s' % fileLink"""
print 'ln -s %s %s.png' % (fileLink, channelName.replace(",",";").split(';')[0].replace(" ","\\ ").replace("(","\(").replace(")","\)"))
except:
print '#File: %s not found' % channelName
"""print '# ln -s [%s] %s.png' % (
channelName, serviceRefs[channelName])"""
def main():
# Define commandline arguments
parser = argparse.ArgumentParser(description="Automatically provide shell scripts for linking ocram's picons.")
parser.add_argument('-c', '--channels',
metavar = 'channels.conf',
default = '/etc/vdr/channels.conf',
help = 'pathname of channels.conf')
parser.add_argument('-n', '--providername',
metavar = 'MyProvider',
default = None,
help = "name of service provider (e.g. Sky)")
parser.add_argument('-p', '--picondir',
metavar = 'picons dir',
default = './picons',
help = "directory containing ocram's picons")
parser.add_argument('-t', '--tvonly',
action = 'store_true',
default = False,
help = "process TV channels only (i.e. no Radio)")
argsDict = vars(parser.parse_args())
# Instantiate
picons = PIcons(channels_conf = argsDict['channels'],
tvonly = argsDict['tvonly'],
provider_name = argsDict['providername'],
picons_dir = argsDict['picondir'])
# Print script snippet
picons.lnscript()
if __name__ == '__main__':
sys.exit(main())