def readPMT(self, bits, pos):
'''
Method decode next PMT packet
:param bits: Packet data in bits format
:param pos: Position in packet
:return: None
'''
try:
if self.leng['actual'] + 184 > self.leng['total']:
pos.setMinPos((self.leng['total'] - self.leng['actual']) * 8)
pos.setCrc()
else:
self.leng['actual'] = self.leng['actual'] + 184
while True:
if self.pmtItem['stream_type'] == None:
self.pmtItem['stream_type'] = getBits(bits, pos, 4)
if self.pmtItem['reserved_1'] == None:
self.pmtItem['reserved_1'] = getBits(bits, pos, 4)
if self.pmtItem['elementary_PID'] == None:
self.pmtItem['elementary_PID'] = getBits(bits, pos, 12)
if self.pmtItem['reserved_2'] == None:
self.pmtItem['reserved_2'] = getBits(bits, pos, 4)
if self.pmtItem['ES_info_length'] == None:
self.pmtItem['ES_info_length'] = getBits(bits, pos, 12)
getBits(bits, pos, self.pmtItem['ES_info_length'] * 8)
getBits(bits, pos, 4)
self.pmtData['data'].append(self.pmtItem)
self.pmtItem = self.getClearPmtItem()
except CRC:
if self.pmtData['crc_32'] == None:
self.pmtData['crc_32'] = getBits(bits, pos, 32, True)
except PositionZero:
return
def DVBDescriptorTagDecoder(self, bits, pos):
'''
DVB deskriptor tag Decoder
:param bits: Data in bits format
:param pos: position in packet
:return:
'''
item = {
'DVB_descriptor_tag': None,
'descriptor_length': None,
'data': None
}
item['DVB_descriptor_tag'] = getBits(bits, pos, 8)
item['descriptor_length'] = getBits(bits, pos, 8)
if item['DVB_descriptor_tag'] == 74: #linkage deskroptor
item['data'] = self.linkageDescriptor(bits, pos)
elif item[
'DVB_descriptor_tag'] == 90: #terrestrial_delivery_system_descriptor
item['data'] = self.terrestrialDeliverySystemDescriptor(bits, pos)
elif item['DVB_descriptor_tag'] == 98: #frequency_list_descriptor
pos.addMin(item['descriptor_length'] * 8)
item['data'] = self.frequencyListDescriptor(bits, pos)
elif item['DVB_descriptor_tag'] == 64:
pos.addMin(item['descriptor_length'] * 8)
item['data'] = self.networkNameDescriptor(bits, pos)
else:
return None
return item
def readPAT(self, bits,pos):
'''
Method decode next PAT packet
:param bits: Packet data in bits format
:param pos: Position in packet
:return: None
'''
try:
if self.leng['actual']+184 > self.leng['total']:
pos.setMinPos((self.leng['total']-self.leng['actual'])*8)
pos.setCrc()
else:
self.leng['actual']=self.leng['actual']+184
while True:
if self.patItem['program_number'] == None: self.patItem['program_number'] = getBits(bits,pos,16)
if self.patItem['reserved'] == None: self.patItem['reserved'] = getBits(bits,pos,3)
if self.patItem['program_number'] == 0:
if self.patItem['network_PID'] == None: self.patItem['network_PID'] = getBits(bits,pos,13)
else:
if self.patItem['program_map_pid'] == None: self.patItem['program_map_pid'] = getBits(bits,pos,13)
self.patData['data'].append(self.patItem)
self.patItem = self.getClearPatItem()
except CRC:
if self.patData['crc_32'] == None: self.patData['crc_32'] = getBits(bits,pos,32,True)
except PositionZero:
return()
def readHeader(self, bits):
'''
Method read header of ts file
:param bits: header bits
:return: header structure
'''
pos = Position(32)
sync_byte = getBits(bits,pos,8)
transport_error_indicator = getBits(bits,pos,1)
payload_unit_start_indicator = getBits(bits,pos,1)
transport_priority = getBits(bits,pos,1)
pid = getBits(bits,pos,13)
if not pid in self.pidDict.keys():
self.pidDict[pid] = {'count':0, 'byterate':0}
else:
self.pidDict[pid]['count'] = self.pidDict[pid]['count'] + 1
transport_scrambling_control = getBits(bits,pos,2)
adaptation_field_control = getBits(bits,pos,1)
payload_flag = getBits(bits,pos,1)
continuity_counter = getBits(bits,pos,4)
return({'sync_byte':sync_byte,'transport_error_indicator':transport_error_indicator
,'payload_unit_start_indicator':payload_unit_start_indicator,
'transport_priority':transport_priority,'pid':pid,
'transport_scrambling_control':transport_scrambling_control,
'adaptation_field_control':adaptation_field_control,
'payload_flag':payload_flag,'continuity_counter':continuity_counter})
def frequencyListDescriptor(self, bits, pos):
'''
Method decode frequency list descriptor
:param bits: Data in bits format
:param pos: position in packet
:return:
'''
item = {
'reserved_future_use': None,
'coding_type': None,
'centre_frequency': []
}
item['reserved_future_use'] = getBits(bits, pos, 6)
item['coding_type'] = getBits(bits, pos, 2)
try:
while True:
item['centre_frequency'].append(getBits(bits, pos, 32))
except:
return item
def streamType3(self, bits, pos):
'''
Method decode stream type 3
:param bits: Packet data in bits format
:param pos: Position in packet
:return: None
'''
if self.pmtItem['MPEG_DescriptorTag'] == None:
self.pmtItem['MPEG_DescriptorTag'] = getBits(bits, pos, 8)
if self.pmtItem['descriptor_length'] == None:
self.pmtItem['descriptor_length'] = getBits(bits, pos, 8)
if self.pmtItem['descriptor_length'] > 0:
pos.addMin(self.pmtItem['descriptor_length'] * 8)
try:
while True:
if self.pmtItem['ISO639_language_code'] == None:
self.pmtItem['ISO639_language_code'] = self.pmtItem[
'ISO639_language_code'] + getBits(bits, pos, 8)
except MinimalPosition:
pass
if self.pmtItem['Audio_type'] == None:
self.pmtItem['Audio_type'] = getBits(bits, pos, 8)
def networkNameDescriptor(self, bits, pos):
'''
Method read network name descriptor
:param bits: Data in bits format
:param pos: position in packet
:return: string with Network name descriptor
'''
Network_name = ''
try:
while True:
data = getBits(bits, pos, 8)
Network_name = Network_name + chr(data)
except MinimalPosition:
return Network_name
def streamType2(self, bits, pos):
'''
Method decode stream type 2
:param bits: Packet data in bits format
:param pos: Position in packet
:return: None
'''
if self.pmtItem['MPEG_DescriptorTag'] == None:
self.pmtItem['MPEG_DescriptorTag'] = getBits(bits, pos, 8)
if self.pmtItem['descriptor_length'] == None:
self.pmtItem['descriptor_length'] = getBits(bits, pos, 8)
if self.pmtItem['multiple_frame_rate_flag'] == None:
self.pmtItem['multiple_frame_rate_flag'] = getBits(bits, pos, 1)
if self.pmtItem['frame_rate_code'] == None:
self.pmtItem['frame_rate_code'] = getBits(bits, pos, 4)
if self.pmtItem['MPEG_1_only_flag'] == None:
self.pmtItem['MPEG_1_only_flag'] = getBits(bits, pos, 1)
if self.pmtItem['constrained_parameter_flag'] == None:
self.pmtItem['constrained_parameter_flag'] = getBits(bits, pos, 1)
if self.pmtItem['still_picture_flag'] == None:
self.pmtItem['still_picture_flag'] = getBits(bits, pos, 1)
def linkageDescriptor(self, bits, pos):
'''
Method decode linkage descriptor
:param bits: Data in bits format
:param pos: position in packet
:return:
'''
item = {
'transport_stream_ID': None,
'original_network_ID': None,
'service_ID': None,
'linkage_type': None,
'OUI_data_length': None,
'OUI': None,
'selector_length': None
}
item['transport_stream_ID'] = getBits(bits, pos, 16)
item['original_network_ID'] = getBits(bits, pos, 16)
item['service_ID'] = getBits(bits, pos, 16)
item['linkage_type'] = getBits(bits, pos, 8)
item['OUI_data_length'] = getBits(bits, pos, 8)
item['OUI'] = getBits(bits, pos, 24)
item['selector_length'] = getBits(bits, pos, 8)
return item
def readNIT(self, bits, pos):
'''
Method read nit packet
:param bits: Packet data in bits format
:param pos: Position in packet
:return:
'''
try:
self.nitData['table_id'] = getBits(bits, pos, 8)
self.nitData['section_syntax_indicator'] = getBits(bits, pos, 1)
self.nitData['reserved_1'] = getBits(bits, pos, 1)
self.nitData['reserved_2'] = getBits(bits, pos, 2)
self.nitData['section_length'] = getBits(bits, pos, 12)
pos.setMinPos(self.nitData['section_length'] * 8)
self.nitData['network_id'] = getBits(bits, pos, 16)
self.nitData['reserved_3'] = getBits(bits, pos, 2)
self.nitData['version_number'] = getBits(bits, pos, 5)
self.nitData['current_next_indicator'] = getBits(bits, pos, 1)
self.nitData['section_number'] = getBits(bits, pos, 8)
self.nitData['last_section_number'] = getBits(bits, pos, 8)
self.nitData['reserved_4'] = getBits(bits, pos, 4)
self.nitData['network_descriptors_length'] = getBits(bits, pos, 12)
pos.addMin(self.nitData['network_descriptors_length'] * 8)
try:
while True:
self.nitData['DVBDescriptorTags'].append(
self.DVBDescriptorTagDecoder(bits, pos))
except MinimalPosition:
pass
self.nitData['reserved_5'] = getBits(bits, pos, 4)
self.nitData['transport_stream_loop_length'] = getBits(
bits, pos, 12)
pos.addMin(self.nitData['transport_stream_loop_length'] * 8)
try:
while True:
item = {
'transport_stream_ID': None,
'original_network_ID': None,
'reserved': None,
'transport_descriptors_length': None,
'DVBDescriptorTags': []
}
item['transport_stream_ID'] = getBits(bits, pos, 16)
self.nitData['transport_stream_loop'].append(item)
item['original_network_ID'] = getBits(bits, pos, 16)
item['reserved'] = getBits(bits, pos, 4)
item['transport_descriptors_length'] = getBits(
bits, pos, 12)
pos.addMin(item['transport_descriptors_length'] * 8)
try:
while True:
item['DVBDescriptorTags'].append(
self.DVBDescriptorTagDecoder(bits, pos))
except MinimalPosition:
pass
except MinimalPosition:
pass
except CRC:
self.nitData['CRC_32'] = getBits(bits, pos, 32, True)
def terrestrialDeliverySystemDescriptor(self, bits, pos):
'''
Method decode terrestrial delivery system descriptor
:param bits: Data in bits format
:param pos: position in packet
:return:
'''
item = {
'center_frequency': None,
'brandwidth': None,
'brandwidthValue': None,
'priority': None,
'time_slicing_indicator': None,
'MPE_FEC_indicator': None,
'reserved_1': None,
'constellation': None,
'constellationValue': None,
'hierarchy_information': None,
'Code_rate_HP_stream': None,
'Code_rate_LP_stream': None,
'code_rateValue': None,
'guard_interval': None,
'guard_intervalValue': None,
'transmission_mode': None,
'other_frequency_flag': None,
'reserved_future_use': None
}
item['center_frequency'] = getBits(bits, pos, 32)
item['brandwidth'] = getBits(bits, pos, 3)
item['brandwidthValue'] = self.getBrandwitchValue(item['brandwidth'])
item['priority'] = getBits(bits, pos, 1)
item['time_slicing_indicator'] = getBits(bits, pos, 1)
item['MPE_FEC_indicator'] = getBits(bits, pos, 1)
item['reserved_1'] = getBits(bits, pos, 2)
item['constellation'] = getBits(bits, pos, 2)
item['constellationValue'] = self.getConstellationValue(
item['constellation'])
item['hierarchy_information'] = getBits(bits, pos, 3)
item['Code_rate_HP_stream'] = getBits(bits, pos, 3)
item['code_rateValue'] = self.getCodeRateValue(
item['Code_rate_HP_stream'])
item['Code_rate_LP_stream'] = getBits(bits, pos, 3)
item['guard_interval'] = getBits(bits, pos, 2)
item['guard_intervalValue'] = self.getGuardIntervalValue(
item['guard_interval'])
item['transmission_mode'] = getBits(bits, pos, 2)
item['other_frequency_flag'] = getBits(bits, pos, 1)
item['reserved_future_use'] = getBits(bits, pos, 32)
return item
def readHeader(self, bits, pos):
'''
Method read PMT header
:param bits: Packet data in bits format
:param pos: Position in packet
:return: None
'''
header = {
'table_id': None,
'section_syntax_indicator': None,
'fixed': None,
'reserved_1': None,
'section_length': None,
'program_number': None,
'reserved_2': None,
'version_number': None,
'current_next_indicator': None,
'section_number': None,
'last_section_number': None,
'reserved_3': None,
'PCR_PID': None,
'reserved_4': None,
'program_info_length': None
}
getBits(bits, pos, 8)
header['table_id'] = getBits(bits, pos, 8)
header['section_syntax_indicator'] = getBits(bits, pos, 1)
header['fixed'] = getBits(bits, pos, 1)
header['reserved_1'] = getBits(bits, pos, 2)
header['section_length'] = getBits(bits, pos, 12)
self.leng['total'] = header['section_length']
header['program_number'] = getBits(bits, pos, 16)
header['reserved_2'] = getBits(bits, pos, 2)
header['version_number'] = getBits(bits, pos, 5)
header['current_next_indicator'] = getBits(bits, pos, 1)
header['section_number'] = getBits(bits, pos, 8)
header['last_section_number'] = getBits(bits, pos, 8)
header['reserved_3'] = getBits(bits, pos, 4)
header['PCR_PID'] = getBits(bits, pos, 12)
header['reserved_4'] = getBits(bits, pos, 4)
header['program_info_length'] = getBits(bits, pos, 16)
return header
def readHeader(self,bits,pos):
'''
Method read header of nit packet
:param bits: Packet data in bits format
:param pos: Position in packet
:return: None
'''
getBits(bits,pos,8)
header = {'table_id':None,'section_syntax_indicator':None,'fixed':None,'reserved_1':None,'section_length':None
,'transport_stream_id':None,'reserved_2':None,'version_number':None,'current_next_indicator':None
,'section_number':None,'last_section_number':None}
header['table_id'] = getBits(bits,pos,8)
header['section_syntax_indicator'] = getBits(bits,pos,1)
header['fixed'] = getBits(bits,pos,1)
header['reserved_1'] = getBits(bits,pos,2)
header['section_length'] = getBits(bits,pos,12)
self.leng['total'] = header['section_length']
header['transport_stream_id'] = getBits(bits,pos,16)
header['reserved_2'] = getBits(bits,pos,2)
header['version_number'] = getBits(bits,pos,5)
header['current_next_indicator'] = getBits(bits,pos,1)
header['section_number'] = getBits(bits,pos,8)
header['last_section_number'] = getBits(bits,pos,8)
return header