def parse_tspacket(packet, packetnum):
three_bytes = BitBin(packet[:3])
tei = three_bytes.asflag(1)
pusi = three_bytes.asflag(1)
ts_priority = three_bytes.asflag(1)
pid = three_bytes.asint(13)
if pusi:
parse_pes(packet, packetnum)
def parse_pes(packet, packetnum):
bb = BitBin(packet[3:])
if bb.asint(24) == 1 and bb.asint(8) not in NON_PTS_STREAM_IDS:
PES_packet_length = bb.asint(16)
if bb.asint(2) == 2:
bb.asint(6)
if bb.asint(2) in [2, 3]:
bb.asint(14)
if bb.asint(4) in [2, 3]:
to33 = bb.asint(3) << 30
bb.asflag(1)
to30 = bb.asint(15) << 15
bs.asflag(1)
to15 = bb.asint(15)
d = to33 + to30 + to15
print(f" PTS {d/90000:.6f} on Packet {packetnum}")
def decode(self, bites):
bitbin = BitBin(bites)
self.table_id = bitbin.ashex(8)
if self.table_id != "0xfc":
to_stderr("splice info section table id should be 0xfc")
self.section_syntax_indicator = bitbin.asflag(1)
self.private = bitbin.asflag(1)
self.reserved = bitbin.ashex(2)
if self.reserved != "0x3":
to_stderr("splice info section reserved should be 0x3")
self.section_length = bitbin.asint(12)
self.protocol_version = bitbin.asint(8)
if self.protocol_version != 0:
to_stderr("splice info section protocol version should be 0")
self.encrypted_packet = bitbin.asflag(1)
self.encryption_algorithm = bitbin.asint(6)
self.pts_adjustment = bitbin.as90k(33)
self.cw_index = bitbin.ashex(8)
self.tier = bitbin.ashex(12)
self.splice_command_length = bitbin.asint(12)
self.splice_command_type = bitbin.asint(8)
self.descriptor_loop_length = 0
def decode(self):
"""
decode a segmentation descriptor
"""
bitbin = BitBin(self.bites)
self.parse_id(bitbin)
self.segmentation_event_id = bitbin.ashex(32) # 4 bytes
self.segmentation_event_cancel_indicator = bitbin.asflag(1)
bitbin.forward(7) # 1 byte
if not self.segmentation_event_cancel_indicator:
self._decode_flags(bitbin) # 1 byte
if not self.program_segmentation_flag:
self._decode_components(bitbin)
self._decode_segmentation(bitbin)
def decode(self, bites):
bitbin = BitBin(bites)
self.table_id = bitbin.ashex(8)
if self.table_id != '0xfc':
raise ValueError('splice_info_section.table_id should be 0xfc')
self.section_syntax_indicator = bitbin.asflag(1)
self.private = bitbin.asflag(1)
self.reserved = bitbin.ashex(2)
if self.reserved != '0x3':
raise ValueError('splice_info_section.reserved should be 0x3')
self.section_length = bitbin.asint(12)
self.protocol_version = bitbin.asint(8)
if self.protocol_version != 0:
raise ValueError(
'splice_info_section.protocol_version should be 0')
self.encrypted_packet = bitbin.asflag(1)
self.encryption_algorithm = bitbin.asint(6)
self.pts_adjustment = bitbin.as90k(33)
self.cw_index = bitbin.ashex(8)
self.tier = bitbin.ashex(12)
self.splice_command_length = bitbin.asint(12)
self.splice_command_type = bitbin.asint(8)
self.descriptor_loop_length = 0
def decode(self):
"""
Decode SCTE35 Audio Descriptor
"""
bitbin = BitBin(self.bites)
self.parse_id(bitbin)
self.audio_count = a_c = bitbin.asint(4)
bitbin.forward(4)
while a_c:
a_c -= 1
comp = {}
comp["component_tag"] = bitbin.asint(8)
comp["ISO_code="] = bitbin.asint(24)
comp["bit_stream_mode"] = bitbin.asint(3)
comp["num_channels"] = bitbin.asint(4)
comp["full_srvc_audio"] = bitbin.asflag(1)
self.components.append(comp)
def decode(self):
"""
SpliceInsert.decode
"""
bitbin = BitBin(self.bites)
start = bitbin.idx
self.splice_event_id = bitbin.asint(32)
self.splice_event_cancel_indicator = bitbin.asflag(1)
bitbin.forward(7)
if not self.splice_event_cancel_indicator:
self._decode_flags(bitbin)
if self.program_splice_flag:
if not self.splice_immediate_flag:
self._decode_pts(bitbin)
else:
self._decode_components(bitbin)
if not self.splice_immediate_flag:
self._decode_pts(bitbin)
if self.duration_flag:
self._decode_break(bitbin)
self.unique_program_id = bitbin.asint(16)
self.avail_num = bitbin.asint(8)
self.avail_expected = bitbin.asint(8)
self._set_len(start, bitbin.idx)