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eitreader.py
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eitreader.py
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# -*- coding: utf-8 -*-
import sys
import math
import time
import datetime
import calendar
TS_HEADER_BITS=(8,1,1,1,13,2,2,4)
TS_HEADER_NAMES=('sync','tei','pusi','tp','pid','tsc','afc','cc')
EIT_TABLE_BITS = (8,1,1,2,12,16,2,5,1,8,8,16,16,8,8)
EIT_TABLE_NAMES = ('table_id', 'section_syntax_indicator', 'reserved_future_use', 'reserved', 'section_length', 'service_id', 'reserved', 'version_number', 'current_next_indicator', 'section_number', 'last_section_number', 'transport_stream_id', 'original_network_id', 'segment_last_section_number','last_table_id')
EIT_TABLE_EVENTS_BITS = (16,40,24,3,1,12)
EIT_TABLE_EVENTS_NAMES = ('event_id', 'start_time', 'duration', 'running_status', 'free_CA_mode', 'descriptors_loop_length')
SDT_TABLE_BITS=(8,1,1,2,12,16,2,5,1,8,8,16,8)
SDT_TABLE_NAMES = ('table_id', 'section_syntax_indicator', 'reserved_future_use', 'reserved', 'section_length', 'transport_stream_id', 'reserved', 'version_number', 'current_next_indicator', 'section_number', 'last_section_number', 'original_network_id','reserved_future_use')
DESCRIPTORS_DEFINITION = {0x40:'network_name_descriptor', 0x41:'service_list_descriptor', 0x42:'stuffing_descriptor',
0x43:'satellite_delivery_system_descriptor', 0x44:'cable_delivery_system_descriptor',
0x45:'VBI_data_descriptor', 0x46:'VBI_teletext_descriptor', 0x47:'bouquet_name_descriptor',
0x48:'service_descriptor', 0x49:'country_availability_descriptor', 0x4A:'linkage_descriptor',
0x4B:'NVOD_reference_descriptor', 0x4C:'time_shifted_service_descriptor', 0x4D:'short_event_descriptor',
0x4E:'extended_event_descriptor', 0x4F:'time_shifted_event_descriptor', 0x50:'component_descriptor',
0x51:'mosaic_descriptor', 0x52:'stream_identifier_descriptor', 0x53:'CA_identifier_descriptor',
0x54:'content_descriptor', 0x55:'parental_rating_descriptor', 0x56:'teletext_descriptor',
0x57:'telephone_descriptor', 0x58:'local_time_offset_descriptor', 0x59:'subtitling_descriptor',
0x5A:'terrestrial_delivery_system_descriptor', 0x5B:'multilingual_network_name_descriptor',
0x5C:'multilingual_bouquet_name_descriptor', 0x5D:'multilingual_service_name_descriptor',
0x5E:'multilingual_component_descriptor', 0x5F:'private_data_specifier_descriptor',
0x60:'service_move_descriptor', 0x61:'short_smoothing_buffer_descriptor',
0x62:'frequency_list_descriptor', 0x63:'partial_transport_stream_descriptor',
0x64:'data_broadcast_descriptor', 0x65:'scrambling_descriptor', 0x66:'data_broadcast_id_descriptor',
0x67:'transport_stream_descriptor', 0x68:'DSNG_descriptor', 0x69:'PDC_descriptor', 0x6A:'AC-3_descriptor',
0x6B:'ancillary_data_descriptor', 0x6C:'cell_list_descriptor', 0x6D:'cell_frequency_link_descriptor',
0x6E:'announcement_support_descriptor', 0x6F:'application_signalling_descriptor', 0x70:'adaptation_field_data_descriptor',
0x71:'service_identifier_descriptor', 0x72:'service_availability_descriptor', 0x73:'default_authority_descriptor',
0x74:'related_content_descriptor', 0x75:'TVA_id_descriptor', 0x76:'content_identifier_descriptor',
0x77:'time_slice_fec_identifier_descriptor', 0x78:'ECM_repetition_rate_descriptor',
0x79:'S2_satellite_delivery_system_descriptor', 0x7A:'enhanced_AC-3_descriptor', 0x7B:'DTS descriptor',
0x7C:'AAC descriptor', 0x7D:'XAIT location descriptor', 0x7E:'FTA_content_management_descriptor', 0x7F:'extension descriptor'}
for i in range(0x80,0xFF):
DESCRIPTORS_DEFINITION[i]='user defined %s' % hex(i)
EIT_TABLE_EVENTS_DESCRIPTORS=DESCRIPTORS_DEFINITION
EXTENDED_EVENT_DESCRIPTOR_BITS=(4,4,24,8)
EXTENDED_EVENT_DESCRIPTOR_NAMES=('descriptor_number','last_descriptor_number','ISO_639_language_code','length_of_items')
PAT_TABLE_BITS=(8,1,1,2,12,16,2,5,1,8,8)
PAT_TABLE_NAMES=('table_id','section_syntax_indicator','zero','reserved','section_length','transport_stream_id','reserved','version_number','current_next_indicator','section_number','last_section_number')
SDT_TABLE_SERVICE_BITS=(16,6,1,1,3,1,12)
SDT_TABLE_SERVICE_NAMES=('service_id','reserved_future_use','EIT_schedule_flag','EIT_present_following_flag','running_status','free_CA_mode','descriptors_loop_length')
class eitreader():
def __init__(self):
self.eit = {}
self.pat = None
self.sdt = None
self._interesting_pids = [0x0,0x11,0x12]
self._last_cc = {}
self._sndu = {}
self._errors = {}
def errors(self):
return ', '.join("%s: %s" % (x,self._errors[x]) for x in self._errors.keys())
def _inc_error(self,text):
if not text in self._errors.keys():
self._errors[text] = 1
#sys.stdout.write ("%s, " % text)
else:
self._errors[text] += 1
#sys.stdout.write ("%s, " % text)
def load_ts_packet(self,data):
if (len(data)==0):
return
if (len(data) != 188):
raise Exception('Wrong data!')
(header,i) = self._parse_headers(data,TS_HEADER_BITS,TS_HEADER_NAMES)
# Don't check i is not null because we already checked that data is 188 length
if header['pusi'] != 0:
i += 1
pointer = ord(data[4])
if pointer != 0:
i += pointer
pid = header['pid']
if pid in self._interesting_pids:
#self._myhex(data)
if header['tsc'] != 0:
self._inc_error("WARN: scrambled pid %s!" % hex(pid))
return
if not pid in self._last_cc.keys():
self._last_cc[pid] = None
if not pid in self._sndu.keys():
self._sndu[pid] = None
if self._last_cc[pid] != None:
if (((header['cc'] - self._last_cc[pid]) & 15) != 1):
self._inc_error ("WARN: pid %s cc error!" % hex(pid))
self._sndu[pid] = None
self._last_cc[pid] = header['cc']
if header['pusi'] != 0:
self._parse_table(pid,self._sndu[pid])
self._sndu[pid] = data[i:188]
else:
if not self._sndu[pid] is None:
self._sndu[pid] += data[i:188]
def _parse_headers(self,data,header_bits,header_names):
if len(header_bits) != len(header_names):
raise Exception('len(header_bits) != len(header_names)')
total_bits = sum(header_bits)
if total_bits % 8 != 0:
raise Exception('Unsupported header_bits!')
total_bytes = int(total_bits/8)
if (len(data) < total_bytes):
return ('',0)
header_data = data[:total_bytes]
header = {}
# TODO: make normal
# FIXME: This is very dirty hack
binary_string = ''
for x in header_data:
binary_string += bin(ord(x))[2:].zfill(8)
for x,y in zip(header_bits,header_names):
header[y] = int(binary_string[:x],base=2)
binary_string = binary_string[x:]
return (header,total_bytes)
def _myhex(self,data):
if len(data) > 0:
print ':'.join ('%02x' % ord(x) for x in data)
else:
print "<nodata>"
print ""
def _parse_descriptors_loop(self,data):
result = {}
while data:
if (len(data) >= 2):
desc_id = ord(data[0])
desc_len = ord(data[1])
if desc_id != 0xFF:
result[DESCRIPTORS_DEFINITION[desc_id]] = data[2:2+desc_len]
data = data[desc_len+2:]
else:
self._inc_error('descriptors loop desc id error')
data = ()
else:
self._inc_error('descriptors loop parse error')
data = ()
return result
def _decode_text(self,text):
CHARACTER_CODING_TABLE = {0x01:'ISO-8859-5',0x02:'ISO-8859-6',0x03:'ISO-8859-7',0x04:'ISO-8859-8',
0x05:'ISO-8859-9',0x06:'ISO-8859-10',0x07:'ISO-8859-11',0x08:None,
0x09:'ISO-8859-13',0x0A:'ISO-8859-14',0x0B:'ISO-8859-15',
0x0C:None,0x0D:None,0x0E:None,0x0F:None,
0x10:None,0x11:None,0x12:None,0x13:None,0x14:None,0x15:None, # FIXME and TODO: FILL 0x10-0x15
0x16:None,0x17:None,0x18:None,0x19:None,0x1A:None,0x1B:None,
0x1C:None,0x1D:None,0x1E:None,
0x1F:None
}
if text:
try:
first_character_number = ord(text[0])
if (first_character_number >= 0x20 and first_character_number <= 0xFF):
text = text.decode('latin1')
elif not CHARACTER_CODING_TABLE[first_character_number] is None:
text = text[1:].decode(CHARACTER_CODING_TABLE[first_character_number])
else:
text = u''
self._inc_error('TODO decode')
except UnicodeDecodeError:
self._inc_error('UnicodeDecodeError')
text = u''
return text
def _parse_descriptors(self,parsed_loop):
if 'service_descriptor' in parsed_loop.keys():
service_descriptor = parsed_loop['service_descriptor']
if (len (service_descriptor) >= 2):
service_provider_name_length = ord(service_descriptor[1])
parsed_loop['service_provider_name'] = service_descriptor[2:2+service_provider_name_length]
if (len (service_descriptor) >= 1 + 2 + service_provider_name_length):
service_name_length = ord(service_descriptor[2+service_provider_name_length])
parsed_loop['service_name'] = self._decode_text( \
service_descriptor[3+service_provider_name_length:3+service_provider_name_length+service_name_length])
else:
self._inc_error('service_descriptor service_name error')
else:
self._inc_error('service_descriptor error')
if 'short_event_descriptor' in parsed_loop.keys():
short_event_descriptor_data = parsed_loop['short_event_descriptor']
if (len(short_event_descriptor_data) >= 4):
event_name_length = ord(short_event_descriptor_data[3])
parsed_loop['event_name'] = self._decode_text( short_event_descriptor_data[4:4+event_name_length] )
if (len (short_event_descriptor_data) >= 1 + 4 + event_name_length):
event_text_length = ord(short_event_descriptor_data[4+event_name_length])
parsed_loop['event_text'] = self._decode_text( \
short_event_descriptor_data[4+event_name_length+1:4+event_name_length+1+event_text_length] )
else:
self._inc_error('short_event_descriptor event_text error')
else:
self._inc_error('short_event_descriptor error')
if 'extended_event_descriptor' in parsed_loop.keys():
extended_event_descriptor_data = parsed_loop['extended_event_descriptor']
(extended_event_descriptor_header,iii) = self._parse_headers(extended_event_descriptor_data,EXTENDED_EVENT_DESCRIPTOR_BITS,EXTENDED_EVENT_DESCRIPTOR_NAMES)
if iii:
items_raw = extended_event_descriptor_data[iii:iii+extended_event_descriptor_header['length_of_items']]
if (len(extended_event_descriptor_data) >= 1 + iii+extended_event_descriptor_header['length_of_items']):
text_length = ord(extended_event_descriptor_data[iii+extended_event_descriptor_header['length_of_items']])
parsed_loop['extended_text'] = self._decode_text( \
extended_event_descriptor_data[iii+extended_event_descriptor_header['length_of_items']+1:\
iii+extended_event_descriptor_header['length_of_items']+1+text_length] )
else:
self._inc_error('extended_event_descriptor extended_text error')
else:
self._inc_error('extended_event_descriptor data less than header definition')
return parsed_loop
def _jd_to_date(self,jd):
jd = jd + 0.5
F, I = math.modf(jd)
I = int(I)
A = math.trunc((I - 1867216.25)/36524.25)
if I > 2299160:
B = I + 1 + A - math.trunc(A / 4.)
else:
B = I
C = B + 1524
D = math.trunc((C - 122.1) / 365.25)
E = math.trunc(365.25 * D)
G = math.trunc((C - E) / 30.6001)
day = int(C - E + F - math.trunc(30.6001 * G))
if G < 13.5:
month = G - 1
else:
month = G - 13
if month > 2.5:
year = D - 4716
else:
year = D - 4715
return year, month, day
def _mjd_to_jd(self,mjd):
return mjd + 2400000.5
def _mjd_to_date(self,mjd):
return self._jd_to_date(self._mjd_to_jd(mjd))
def _start_time_to_unix(self,start_time):
mjd = (start_time & 0xFFFF000000L) / 0xFFFFFF
stime = ("%s" % hex(int(start_time & 0xFFFFFF))[2:]).zfill(6)
(y,m,d) = self._mjd_to_date(mjd)
st = "%s%02d%02d%s" % (y,m,d,stime)
dt = datetime.datetime(year=y, month=m, day=d, hour=int(stime[0:2]), minute=int(stime[2:4]), second=int(stime[4:6]),tzinfo=None)
utime = calendar.timegm(dt.utctimetuple())
return utime
def _duration_to_seconds(self,duration):
dtime = ("%s" % hex(int(duration & 0xFFFFFF))[2:]).zfill(6)
return int(dtime[0:2])*60*60 + int(dtime[2:4])*60 + int(dtime[4:6])
def _parse_table(self,pid,table_data):
if table_data is None:
return
table_id = ord(table_data[0])
if pid == 0x12:
if ((table_id >= 0x50 and table_id <= 0x5F) or table_id == 0x4E): # EIT: actual TS, event schedule information + present/following
(eit_header,iii) = self._parse_headers(table_data,EIT_TABLE_BITS,EIT_TABLE_NAMES)
if iii:
table_events = table_data[iii:eit_header['section_length']+3-4]# -4 CRC32
if not eit_header['service_id'] in self.eit.keys():
self.eit[eit_header['service_id']] = {}
if not eit_header['table_id'] in self.eit[eit_header['service_id']].keys():
self.eit[eit_header['service_id']][eit_header['table_id']] = {}
if not eit_header['section_number'] in self.eit[eit_header['service_id']][eit_header['table_id']].keys():
self.eit[eit_header['service_id']][eit_header['table_id']][eit_header['section_number']] = {}
events_dict = {}
while (table_events):
(table_event,iii) = self._parse_headers(table_events,EIT_TABLE_EVENTS_BITS,EIT_TABLE_EVENTS_NAMES)
if iii:
descriptors_loop = table_events[iii:iii+table_event['descriptors_loop_length']]
table_events = table_events[iii+table_event['descriptors_loop_length']:]
parsed_event_descriptions = self._parse_descriptors(self._parse_descriptors_loop(descriptors_loop))
events_dict[table_event['event_id']] = table_event
for x in parsed_event_descriptions.keys():
events_dict[table_event['event_id']][x] = parsed_event_descriptions[x]
else:
self._inc_error('eit events array error')
table_events = ()
self.eit[eit_header['service_id']][eit_header['table_id']][eit_header['section_number']]['events'] = events_dict
self.eit[eit_header['service_id']][eit_header['table_id']][eit_header['section_number']]['table'] = eit_header
else:
self._inc_error('eit data less than header definition')
elif pid == 0x0:
if table_id == 0x0: #PAT
if self.pat is None:
self.pat = {}
(pat_header,iii) = self._parse_headers(table_data,PAT_TABLE_BITS,PAT_TABLE_NAMES)
if iii:
pat_programs = table_data[iii:pat_header['section_length']+3-4]
for i in xrange(0,len(pat_programs),4):
program_number = ord(pat_programs[i])*256 + ord(pat_programs[i+1])
pid_number = (0b00011111 & ord(pat_programs[i+2])) + ord(pat_programs[i+3])
if program_number != 0:
self.pat[program_number] = pid_number
else: #NIT pid detected
pass
else:
self._inc_error('pat data less than header definition')
else:
raise Exception('Wrong table id on 0x0 pid')
elif pid == 0x11:
if table_id == 0x42: # SDT actual TS
if self.sdt is None:
self.sdt = {}
(sdt_header,iii) = self._parse_headers(table_data,SDT_TABLE_BITS,SDT_TABLE_NAMES)
if iii:
sdt_services = table_data[iii:sdt_header['section_length']+3-4]# -4 CRC32
while(sdt_services):
(table_service,iii) = self._parse_headers(sdt_services,SDT_TABLE_SERVICE_BITS,SDT_TABLE_SERVICE_NAMES)
if iii:
descriptors_loop = sdt_services[iii:iii+table_service['descriptors_loop_length']]
sdt_services = sdt_services[iii+table_service['descriptors_loop_length']:]
parsed_service_descriptions = self._parse_descriptors(self._parse_descriptors_loop(descriptors_loop))
self.sdt[table_service['service_id']] = None
if 'service_name' in parsed_service_descriptions.keys():
self.sdt[table_service['service_id']] = parsed_service_descriptions
else:
self._inc_error('sdt services error')
sdt_services = ()
else:
self._inc_error('sdt data less than header definition')
def _check_eit_schedule_fullness_for_this_service_id(self,service_id):
try:
for table_id in range(0x50,self.eit[service_id][0x50][0]['table']['last_table_id']+1):
for segment_id in range(0,int(self.eit[service_id][table_id][0]['table']['last_section_number'] / 8) + 1):
for i in range(8*segment_id,self.eit[service_id][table_id][8*segment_id]['table']['segment_last_section_number']+1):
self.eit[service_id][table_id][i]['events']
except KeyError:
return False
return True
def is_some_eit_present(self):
return not(self.pat is None or self.sdt is None or self.eit is None or list(x for x in self.pat.keys() if x not in self.eit.keys()))
def check_eit_schedule_fullness(self):
if not self.is_some_eit_present():
return False
if self._errors:
return False
for service_id in self.pat.keys():
if not self._check_eit_schedule_fullness_for_this_service_id(service_id):
return False
return True
def return_eit_events(self):
if not self.is_some_eit_present():
self._inc_error ("No EIT at all!")
return {}
if not self.check_eit_schedule_fullness():
self._inc_error ("Warn: EIT is not fully received!")
result = {}
for service_id in self.pat.keys():
name = hex(service_id)
if service_id in self.sdt.keys() and 'service_name' in self.sdt[service_id].keys():
name = self.sdt[service_id]['service_name']
result[name] = []
for table_id in self.eit[service_id].keys():
for section_id in self.eit[service_id][table_id].keys():
for event in self.eit[service_id][table_id][section_id]['events'].values():
#TODO: strip spaces, check for emptyness
if (list(x for x in ('start_time','duration','event_name','event_text') if not x in event.keys())):
continue
start_time_unix = self._start_time_to_unix(event['start_time'])
end_time_unix = self._duration_to_seconds(event['duration']) + start_time_unix
e = {'start':start_time_unix,'stop':end_time_unix}
if 'extended_text' in event.keys() and event['extended_text']:
e['title'] = u"%s %s" % (event['event_name'],event['event_text'])
e['desc'] = event['extended_text']
else:
e['title'] = event['event_name']
e['desc'] = event['event_text']
result[name].append(e)
result[name] = sorted(result[name],key = lambda x: x['start'])
return result