我的兼容dreambox的录像机会在每次录制时存储事件信息表“.eit”文件。我想使用这些信息重新安排我的录音。
中出现了类似的问题格式似乎是二进制格式，如下所述：
https://de.wikipedia.org/wiki/Event_Information_Table 和
http://www.etsi.org/deliver/etsi_en/300400_300499/300468/01.14.01_60/en_300468v011401p.pdf
我正在寻找这种文件的解析器。我在哪里可以找到一个与文件一起使用并且不假设广播流作为输入的文件？
到目前为止我尝试了什么？
我搜索了网络，发现了以下链接和指针：
似乎有一个java库
这是JSR 927 https://jcp.org/en/jsr/detail?id=927的一部分 说明书
看起来这个libary仅适用于Java-ME，请参阅https://en.wikipedia.org/wiki/Java_TV
如果发现了一些与dvb相关的EIT代码片段，例如
https://github.com/jinfeng-geeya/3202C/blob/master/SRC/lib/libdvb/libepg/eit_parser.c
或
http://linuxtv.org/docs/libdvbv5/eit_8h.html
作为Kamaelia DVB工具项目http://www.kamaelia.org/Developers/Projects/DVBTools.html的一部分，似乎有一个python解决方案：
http://pydoc.net/Python/Kamaelia/0.6.0/Kamaelia.Device.DVB.Parse.ParseEventInformationTable/
到目前为止，我发现的最接近的是提示：http：//forums.openpli.org/topic/29141-eit-file-format/，它指向： https://github.com/betonme/e2openplugin-EnhancedMovieCenter/blob/master/src/EitSupport.py
目前我正在寻求从这个开源Python代码开始。
答案 0 :(得分：1)
这是一个似乎是有效开头的Python脚本：
当你用
打电话时python EitParser.py SomeEitFile
它将打印出eit文件的名称和描述。
根据需要添加语言代码，例如来自https://github.com/libo/Enigma2/blob/master/lib/python/Tools/ISO639.py
#!/usr/bin/python
# encoding: utf-8
#
# EitSupport
# Copyright (C) 2011 betonme
# Copyright (C) 2016 Wolfgang Fahl
#
# This EITParser is based on:
# https://github.com/betonme/e2openplugin-EnhancedMovieCenter/blob/master/src/EitSupport.py
#
# In case of reuse of this source code please do not remove this copyright.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# For more information on the GNU General Public License see:
# <http://www.gnu.org/licenses/>.
#
import os
import struct
import time
from datetime import datetime
#from Components.config import config
#from Components.Language import language
#from EMCTasker import emcDebugOut
#from IsoFileSupport import IsoSupport
#from MetaSupport import getInfoFile
#def crc32(data):
# poly = 0x4c11db7
# crc = 0xffffffffL
# for byte in data:
# byte = ord(byte)
# for bit in range(7,-1,-1): # MSB to LSB
# z32 = crc>>31 # top bit
# crc = crc << 1
# if ((byte>>bit)&1) ^ z32:
# crc = crc ^ poly
# crc = crc & 0xffffffffL
# return crc
decoding_charSpecHR = {u'Ć': u'\u0106', u'æ': u'\u0107', u'®': u'\u017D', u'¾': u'\u017E', u'©': u'\u0160', u'¹': u'\u0161', u'Č': u'\u010C', u'è': u'\u010D', u'ð': u'\u0111'}
decoding_charSpecCZSK = {u'Ï'+u'C': u'Č',u'Ï'+u'E': u'Ě',u'Ï'+u'L': u'Ľ',u'Ï'+u'N': u'Ň',u'Ï'+u'R': u'Ř',u'Ï'+u'S': u'Š',u'Ï'+u'T': u'Ť',u'Ï'+u'Z': u'Ž',u'Ï'+u'c': u'č',u'Ï'+u'd': u'ď',u'Ï'+u'e': u'ě',u'Ï'+u'l': u'ľ', u'Ï'+u'n': u'ň',
u'Ï'+u'r': u'ř',u'Ï'+u's': u'š',u'Ï'+u't': u'ť',u'Ï'+u'z': u'ž',u'Ï'+u'D': u'Ď',u'Â'+u'A': u'Á',u'Â'+u'E': u'É',u'Â'+u'I': u'Í',u'Â'+u'O': u'Ó',u'Â'+u'U': u'Ú',u'Â'+u'a': u'á',u'Â'+u'e': u'é',u'Â'+u'i': u'í',u'Â'+u'o': u'ó',
u'Â'+u'u': u'ú',u'Â'+u'y': u'ý',u'Ã'+u'o': u'ô',u'Ã'+u'O': u'Ô',u'Ê'+u'u': u'ů',u'Ê'+u'U': u'Ů',u'È'+u'A': u'Ä',u'È'+u'E': u'Ë',u'È'+u'I': u'Ï',u'È'+u'O': u'Ö',u'È'+u'U': u'Ü',u'È'+u'Y': u'Ÿ',u'È'+u'a': u'ä',u'È'+u'e': u'ë',
u'È'+u'i': u'ï',u'È'+u'o': u'ö',u'È'+u'u': u'ü',u'È'+u'y': u'ÿ'}
def convertCharSpecHR(text):
for i, j in decoding_charSpecHR.iteritems():
text = text.replace(i, j)
return text
def convertCharSpecCZSK(text):
for i, j in decoding_charSpecCZSK.iteritems():
text = text.replace(i, j)
return text
def parseMJD(MJD):
# Parse 16 bit unsigned int containing Modified Julian Date,
# as per DVB-SI spec
# returning year,month,day
YY = int( (MJD - 15078.2) / 365.25 )
MM = int( (MJD - 14956.1 - int(YY*365.25) ) / 30.6001 )
D = MJD - 14956 - int(YY*365.25) - int(MM * 30.6001)
K=0
if MM == 14 or MM == 15: K=1
return (1900 + YY+K), (MM-1-K*12), D
def unBCD(byte):
return (byte>>4)*10 + (byte & 0xf)
#from Tools.ISO639 import LanguageCodes
# -*- coding: iso-8859-2 -*-
LanguageCodes = { }
LanguageCodes["deu"] = LanguageCodes["ger"] = LanguageCodes["de"] = ("German", "Germanic")
LanguageCodes["fra"] = LanguageCodes["fre"] = LanguageCodes["fr"] = ("French", "Romance")
def language_iso639_2to3(alpha2):
ret = alpha2
if alpha2 in LanguageCodes:
language = LanguageCodes[alpha2]
for alpha, name in LanguageCodes.items():
if name == language:
if len(alpha) == 3:
return alpha
return ret
#TEST
#print LanguageCodes["sv"]
#print language_iso639_2to3("sv")
# Eit File support class
# Description
# http://de.wikipedia.org/wiki/Event_Information_Table
class EitList():
EIT_SHORT_EVENT_DESCRIPTOR = 0x4d
EIT_EXTENDED_EVENT_DESCRIPOR = 0x4e
def __init__(self, path=None):
self.eit_file = None
#TODO
# The dictionary implementation could be very slow
self.eit = {}
self.iso = None
self.__newPath(path)
self.__readEitFile()
def __newPath(self, path):
name = None
if path:
if self.eit_file != path:
self.eit_file = path
def __mk_int(self, s):
return int(s) if s else 0
def __toDate(self, d, t):
if d and t:
#TODO Is there another fast and safe way to get the datetime
try:
return datetime(int(d[0]), int(d[1]), int(d[2]), int(t[0]), int(t[1]))
except ValueError:
return None
else:
return None
##############################################################################
## Get Functions
def getEitsid(self):
return self.eit.get('service', "") #TODO
def getEitTsId(self):
return self.eit.get('transportstream', "") #TODO
def getEitWhen(self):
return self.eit.get('when', "")
def getEitStartDate(self):
return self.eit.get('startdate', "")
def getEitStartTime(self):
return self.eit.get('starttime', "")
def getEitDuration(self):
return self.eit.get('duration', "")
def getEitName(self):
return self.eit.get('name', "").strip()
def getEitDescription(self):
return self.eit.get('description', "").strip()
# Wrapper
def getEitShortDescription(self):
return self.getEitName()
def getEitExtendedDescription(self):
return self.getEitDescription()
def getEitLengthInSeconds(self):
length = self.eit.get('duration', "")
#TODO Is there another fast and safe way to get the length
if len(length)>2:
return self.__mk_int((length[0]*60 + length[1])*60 + length[2])
elif len(length)>1:
return self.__mk_int(length[0]*60 + length[1])
else:
return self.__mk_int(length)
def getEitDate(self):
return self.__toDate(self.getEitStartDate(), self.getEitStartTime())
##############################################################################
## File IO Functions
def __readEitFile(self):
data = ""
path = self.eit_file
#lang = language.getLanguage()[:2]
lang = language_iso639_2to3( "de" )
#print lang + str(path)
if path and os.path.exists(path):
#print "Reading Event Information Table " + str(path)
# Read data from file
# OE1.6 with Pyton 2.6
#with open(self.eit_file, 'r') as file: lines = file.readlines()
f = None
try:
f = open(path, 'rb')
#lines = f.readlines()
data = f.read()
except Exception, e:
emcDebugOut("[META] Exception in readEitFile: " + str(e))
finally:
if f is not None:
f.close()
# Parse the data
if data and 12 <= len(data):
# go through events
pos = 0
e = struct.unpack(">HHBBBBBBH", data[pos:pos+12])
event_id = e[0]
date = parseMJD(e[1]) # Y, M, D
time = unBCD(e[2]), unBCD(e[3]), unBCD(e[4]) # HH, MM, SS
duration = unBCD(e[5]), unBCD(e[6]), unBCD(e[7]) # HH, MM, SS
running_status = (e[8] & 0xe000) >> 13
free_CA_mode = e[8] & 0x1000
descriptors_len = e[8] & 0x0fff
if running_status in [1,2]:
self.eit['when'] = "NEXT"
elif running_status in [3,4]:
self.eit['when'] = "NOW"
self.eit['startdate'] = date
self.eit['starttime'] = time
self.eit['duration'] = duration
pos = pos + 12
short_event_descriptor = []
short_event_descriptor_multi = []
extended_event_descriptor = []
extended_event_descriptor_multi = []
component_descriptor = []
content_descriptor = []
linkage_descriptor = []
parental_rating_descriptor = []
endpos = len(data) - 1
while pos < endpos:
rec = ord(data[pos])
length = ord(data[pos+1]) + 2
if rec == 0x4D:
descriptor_tag = ord(data[pos+1])
descriptor_length = ord(data[pos+2])
ISO_639_language_code = str(data[pos+3:pos+5])
event_name_length = ord(data[pos+5])
short_event_description = data[pos+6:pos+6+event_name_length]
if ISO_639_language_code == lang:
short_event_descriptor.append(short_event_description)
short_event_descriptor_multi.append(short_event_description)
elif rec == 0x4E:
ISO_639_language_code = str(data[pos+3:pos+5])
extended_event_description = ""
extended_event_description_multi = ""
for i in range (pos+8,pos+length):
if str(ord(data[i]))=="138":
extended_event_description += '\n'
extended_event_description_multi += '\n'
else:
if data[i]== '\x10' or data[i]== '\x00' or data[i]== '\x02':
pass
else:
extended_event_description += data[i]
extended_event_description_multi += data[i]
if ISO_639_language_code == lang:
extended_event_descriptor.append(extended_event_description)
extended_event_descriptor_multi.append(extended_event_description)
elif rec == 0x50:
component_descriptor.append(data[pos+8:pos+length])
elif rec == 0x54:
content_descriptor.append(data[pos+8:pos+length])
elif rec == 0x4A:
linkage_descriptor.append(data[pos+8:pos+length])
elif rec == 0x55:
parental_rating_descriptor.append(data[pos+2:pos+length])
else:
#print "unsopported descriptor: %x %x" %(rec, pos + 12)
#print data[pos:pos+length]
pass
pos += length
# Very bad but there can be both encodings
# User files can be in cp1252
# Is there no other way?
if short_event_descriptor:
short_event_descriptor = "".join(short_event_descriptor)
else:
short_event_descriptor = "".join(short_event_descriptor_multi)
if short_event_descriptor:
#try:
# short_event_descriptor = short_event_descriptor.decode("iso-8859-1").encode("utf-8")
#except UnicodeDecodeError:
# pass
try:
short_event_descriptor.decode('utf-8')
except UnicodeDecodeError:
try:
short_event_descriptor = short_event_descriptor.decode("cp1252").encode("utf-8")
except UnicodeDecodeError:
# do nothing, otherwise cyrillic wont properly displayed
#short_event_descriptor = short_event_descriptor.decode("iso-8859-1").encode("utf-8")
pass
if (lang == "cs") or (lang == "sk"):
short_event_descriptor = str(convertCharSpecCZSK(short_event_descriptor))
if (lang == "hr"):
short_event_descriptor = str(convertCharSpecHR(short_event_descriptor))
self.eit['name'] = short_event_descriptor
# Very bad but there can be both encodings
# User files can be in cp1252
# Is there no other way?
if extended_event_descriptor:
extended_event_descriptor = "".join(extended_event_descriptor)
else:
extended_event_descriptor = "".join(extended_event_descriptor_multi)
if extended_event_descriptor:
#try:
# extended_event_descriptor = extended_event_descriptor.decode("iso-8859-1").encode("utf-8")
#except UnicodeDecodeError:
# pass
try:
extended_event_descriptor.decode('utf-8')
except UnicodeDecodeError:
try:
extended_event_descriptor = extended_event_descriptor.decode("cp1252").encode("utf-8")
except UnicodeDecodeError:
# do nothing, otherwise cyrillic wont properly displayed
#extended_event_descriptor = extended_event_descriptor.decode("iso-8859-1").encode("utf-8")
pass
if (lang == "cs") or (lang == "sk"):
extended_event_descriptor = str(convertCharSpecCZSK(extended_event_descriptor))
if (lang == "hr"):
extended_event_descriptor = str(convertCharSpecHR(extended_event_descriptor))
self.eit['description'] = extended_event_descriptor
else:
# No date clear all
self.eit = {}
"""Module docstring.
Read Eit File and show the information.
"""
import sys
import getopt
def readeit(eitfile):
eitlist=EitList(eitfile)
print eitlist.getEitName();
print eitlist.getEitStartDate();
print eitlist.getEitDescription();
def main():
# parse command line options
try:
opts, args = getopt.getopt(sys.argv[1:], "h", ["help"])
except getopt.error, msg:
print msg
print "for help use --help"
sys.exit(2)
# process options
for o, a in opts:
if o in ("-h", "--help"):
print __doc__
sys.exit(0)
# process arguments
for arg in args:
readeit(arg) # process() is defined elsewhere
if __name__ == "__main__":
main()