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mpegts.py
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mpegts.py
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# mpegts.py
#
# Copyright 2015, espes
#
# Parts adapted from rtmp-livestreaming
# Copyright 2014, Michael Liao
#
# Licensed under GPL Version 3 or later
#
from construct import *
from collections import defaultdict
from construct_utils import *
crc32_tab = [
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4]
def crc32(data):
i_crc = 0xffffffff;
for ch in data:
i_crc = ((i_crc << 8) & 0xffffffff) ^ crc32_tab[(i_crc >> 24) ^ ord(ch)]
return i_crc
# ISO/IEC 13818-1:2013
# Generic coding of moving pictures and associated audio information
# 2.6
descriptor = Struct("descriptor",
UBInt8("descriptor_tag"),
UBInt8("descriptor_length"),
String("data", this.descriptor_length))
# Switch("data", this.descriptor_tag, {
# }, default=Bork())
# 2.4.3.4
adaptation_field = Struct("adaptation_field",
UBInt8("adaptation_field_length"),
Anchor("_field_start"),
If(lambda ctx: ctx.adaptation_field_length > 0,
Embed(Struct(None,
EmbeddedBitStruct(
Flag("disconuity_indicator"),
Flag("random_access_indicator"),
Flag("elementary_stream_priority_indicator"),
Flag("PCR_flag"),
Flag("OPCR_flag"),
Flag("splicing_point_flag"),
Flag("transport_private_data_flag"),
Flag("adaptation_field_extension_flag")),
If(this.PCR_flag, BitStruct("PCR",
Bits("program_clock_reference_base", 33),
Padding(6),
Bits("program_clock_reference_extension", 9))),
If(this.OPCR_flag, BitStruct("OPCR",
Bits("original_program_clock_reference_base", 33),
Padding(6),
Bits("original_program_clock_reference_extension", 9))),
If(this.splicing_point_flag, UBInt8("splice_countdown")),
# Probe(show_stack=False),
If(this.transport_private_data_flag, Bork("transport_private_data")),
If(this.adaptation_field_extension_flag, Bork("adaptation_field_extension")),
Anchor("_field_end"),
# stuffing
Padding(lambda ctx: ctx.adaptation_field_length - (ctx._field_end - ctx._field_start),
"\xFF", True))))
)
# 2.4.3.2
transport_packet_length = 188
transport_packet_header = Struct("transport_packet_header",
Magic("\x47"), #sync_byte
EmbeddedBitStruct(
Flag("transport_error_indicator"),
Flag("payload_unit_start_indicator"),
Flag("transport_priority"),
Bits("PID", 13),
Bits("transport_scrambling_control", 2),
Bits("adaptation_field_control", 2),
Bits("continuity_counter", 4)),
If(lambda ctx: ctx.adaptation_field_control == 0, Bork()),
If(lambda ctx: ctx.adaptation_field_control & 0b10,
adaptation_field))
transport_packet = Struct("transport_packet",
Anchor("_header_start"),
Embed(transport_packet_header),
Anchor("_header_end"),
If(lambda ctx: ctx.adaptation_field_control & 0b01,
String("data",
lambda ctx: transport_packet_length - (ctx._header_end - ctx._header_start)))
)
MPEG_transport_stream = GreedyRange(transport_packet)
def section(name, table_id, *subcons):
return Struct(name,
Padding(1), #pointer_field ........... ???
Anchor("_crc_start"),
Embed(StructWithLengthAdapter("section",
StructLengthAdapter(
EmbeddedBitStruct(
Const(Bits("table_id", 8), table_id),
Flag("section_syntax_indicator"),
Magic("\x00"),
Padding(2, "\x01"),
Bits("section_length", 12)),
decoder = lambda obj, ctx: obj.section_length-4,
encoder = lambda length, obj, ctx: container_add(obj, section_length=length+4)
),
Embed(Struct(None, *subcons))
)),
Anchor("_crc_end"),
Hash(UBInt32("CRC_32"),
this._crc_start,
lambda ctx: ctx._crc_end - ctx._crc_start,
lambda data, ctx: crc32(data))
)
# 2.4.4.3
# PAT
program_association_section = section("program_association_section", 0,
EmbeddedBitStruct(
Bits("transport_stream_id", 16),
Padding(2, "\x01"),
Bits("version_number", 5),
Flag("current_next_indicator"),
Bits("section_number", 8),
Bits("last_section_number", 8)),
OptionalGreedyRange(BitStruct("maps",
Bits("program_number", 16),
Padding(3, "\x01"),
Bits("program_map_PID", 13))))
# 2.4.4.8
# PMT
TS_program_map_section = section("TS_program_map_section", 2,
EmbeddedBitStruct(
Bits("program_number", 16),
Padding(2, "\x01"),
Bits("version_number", 5),
Flag("current_next_indicator"),
Bits("section_number", 8),
Bits("last_section_number", 8),
Padding(3, "\x01"),
Bits("PCR_PID", 13),
Padding(4, "\x01"),
Bits("program_info_length", 12)),
String("program_info", this.program_info_length),
OptionalGreedyRange(Struct("maps",
EmbeddedBitStruct(
Bits("stream_type", 8),
Padding(3, "\x01"),
Bits("elementary_PID", 13),
Padding(4, "\x01"),
Bits("ES_info_length", 12)),
String("ES_info", this.ES_info_length))),
)
# 2.4.3.6
# Table 2-22 - Stream_id assignments
PES_STREAM_ID_PROGRAM_STREAM_MAP = 0b10111100
PES_STREAM_ID_PRIVATE_STREAM_1 = 0b10111101
PES_STREAM_ID_PADDING_STREAM = 0b10111110
PES_STREAM_ID_PRIVATE_STREAM_2 = 0b10111111
PES_STREAM_ID_ECM = 0b11110000
PES_STREAM_ID_EMM = 0b11110001
PES_STREAM_ID_PROGRAM_STREAM_DIRECTORY = 0b11111111
PES_STREAM_ID_DSMCC_STREAM = 0b11110010
PES_STREAM_ID_ITU_T_REC_H_222_1_TYPE_E_STREAM = 0b11111000
PES_HEADERLESS_STREAMS = (
PES_STREAM_ID_PROGRAM_STREAM_MAP,
PES_STREAM_ID_PRIVATE_STREAM_1,
PES_STREAM_ID_PADDING_STREAM,
PES_STREAM_ID_PRIVATE_STREAM_2,
PES_STREAM_ID_ECM,
PES_STREAM_ID_EMM,
PES_STREAM_ID_PROGRAM_STREAM_DIRECTORY,
PES_STREAM_ID_DSMCC_STREAM,
PES_STREAM_ID_ITU_T_REC_H_222_1_TYPE_E_STREAM)
def Split32(name):
return ExprAdapter(Struct(name,
Bits("v0", 3),
Magic("\x01"),
Bits("v1", 15),
Magic("\x01"),
Bits("v2", 15),
Magic("\x01")),
decoder = lambda obj, ctx: (obj.v0 << 30) | (obj.v1 << 15) | obj.v2,
encoder = lambda obj, ctx: Container(
v0 = obj >> 30,
v1 = (obj >> 15) & 0x7fff,
v2 = obj & 0x7fff)
)
# Table 2-21 - PES packet
PES_packet = Struct("PES_packet",
Magic("\x00\x00\x01"), #packet_start_code_prefix
UBInt8("stream_id"),
Embed(StructWithLengthAdapter(None,
StructLengthAdapter(
UBInt16("PES_packet_length"),
encoder = lambda length, obj, ctx: 0, #length if length < 65536 else 0,
decoder = lambda obj, con: obj if obj != 0 else 1000000000),
# Anchor("header_start"),
If(lambda ctx: ctx.stream_id not in PES_HEADERLESS_STREAMS,
Struct("header",
EmbeddedBitStruct(
Magic("\x01\x00"),
Bits("PES_scrambling_control", 2),
Bits("PES_priority", 1),
Flag("data_alignment_indicator"),
Flag("copyright"),
Flag("original_or_copy"),
Bits("PTS_DTS_flags", 2),
Flag("ESCR_flag"),
Flag("ES_rate_flag"),
Flag("DSM_trick_mode_flag"),
Flag("additional_copy_info_flag"),
Flag("PES_CRC_flag"),
Flag("PES_extension_flag")),
Embed(StructWithLength(None,
UBInt8("PES_header_data_length"),
If(lambda ctx: ctx.PTS_DTS_flags == 0b10,
EmbeddedBitStruct(
Magic("\x00\x00\x01\x00"),
Split32("PTS"))),
If(lambda ctx: ctx.PTS_DTS_flags == 0b11,
EmbeddedBitStruct(
Magic("\x00\x00\x01\x01"),
Split32("PTS"),
Magic("\x00\x00\x00\x01"),
Split32("DTS"))),
If(this.ESCR_flag, Bork("ESCR")),
If(this.ES_rate_flag, Bork("ES_rate")),
If(this.DSM_trick_mode_flag, Bork("DSM_trick")),
If(this.additional_copy_info_flag, Bork("additional_copy_info")),
If(this.PES_CRC_flag, Bork("PES_CRC")),
If(this.PES_extension_flag, Bork("PES_extension")),
StringAdapter(OptionalGreedyRange(Field("stuffing", 1)))
))
)),
# Anchor("header_end"),
# Probe(show_stack=False),
# IfThenElse("data", lambda ctx: ctx.PES_packet_length != 0,
# String("data", lambda ctx: ctx.PES_packet_length - (ctx.header_end - ctx.header_start)),
# StringAdapter(OptionalGreedyRange(Field("data", 1)))
# )
# )
StringAdapter(OptionalGreedyRange(Field("data", 1)))
))
)
class TSMuxer(object):
def __init__(self, f, has_vid_stream, has_aud_stream):
self.f = f
self.has_vid_stream = has_vid_stream
self.has_aud_stream = has_aud_stream
assert self.has_vid_stream or self.has_aud_stream
self.program_number = 1
self.pmt_pid = 4096
self.vid_es_pid = 256
self.aud_es_pid = 267
self.pcr_pid = self.vid_es_pid if self.has_vid_stream else self.self.aud_es_pid
self.vid_stream_type = 0x1B # AVC video stream
self.aud_stream_type = 0x11 # ACC audio with LATM transport
self.pts_clock = 90000 # hz
self.continuity_counters = defaultdict(int)
def write_tables(self):
pat = DefaultingContainer(
table_id = 0,
section_syntax_indicator = True,
transport_stream_id = 1,
version_number = 22,
current_next_indicator = True,
section_number = 0,
last_section_number = 0,
maps = [
Container(
program_number = self.program_number,
program_map_PID = self.pmt_pid)
])
pat_data = program_association_section.build(pat)
# print pat_data.encode("hex")
pat_packet = DefaultingContainer(
transport_error_indicator = False,
payload_unit_start_indicator = True,
transport_priority = False,
PID = 0,
transport_scrambling_control = 0,
adaptation_field_control = 1,
continuity_counter = self.continuity_counters[0] % 16,
adaptation_field = None
)
pat_packet_header = transport_packet_header.build(pat_packet)
pat_packet_data = (pat_packet_header + pat_data).ljust(transport_packet_length, "\xFF")
self.f.write(pat_packet_data)
self.continuity_counters[0] += 1
maps = []
if self.has_vid_stream: maps.append((self.vid_stream_type, self.vid_es_pid))
if self.has_aud_stream: maps.append((self.aud_stream_type, self.aud_es_pid))
pmt = DefaultingContainer(
table_id = 2,
section_syntax_indicator = True,
program_number = self.program_number,
version_number = 0,
current_next_indicator = True,
section_number = 0,
last_section_number = 0,
PCR_PID = self.pcr_pid,
program_info_length = 0,
program_info = '',
maps = [
Container(
stream_type = t,
elementary_PID = pid,
ES_info_length = 0,
ES_info = '') for t, pid in maps
],
)
pmt_data = TS_program_map_section.build(pmt)
pmt_packet = DefaultingContainer(
transport_error_indicator = False,
payload_unit_start_indicator = True,
transport_priority = False,
PID = self.pmt_pid,
transport_scrambling_control = 0,
adaptation_field_control = 1,
continuity_counter = self.continuity_counters[self.pmt_pid] % 16,
adaptation_field = None,
# data = pmt_data.ljust(184, "\xFF")
)
pmt_packet_header = transport_packet_header.build(pmt_packet)
pmt_packet_data = (pmt_packet_header + pmt_data).ljust(transport_packet_length, "\xFF")
self.f.write(pmt_packet_data)
self.continuity_counters[self.pmt_pid] += 1
def mux_h264(self, t, data):
pts = int(t * self.pts_clock)
pes = DefaultingContainer(
stream_id = 0b11100000, # video stream number 0
header = DefaultingContainer(
PES_scrambling_control = 0,
PES_priority = 0,
data_alignment_indicator = False,
copyright = False,
original_or_copy = False,
PTS_DTS_flags = 2, # 3 if DTS else 2
ESCR_flag = False,
ES_rate_flag = False,
DSM_trick_mode_flag = False,
additional_copy_info_flag = False,
PES_CRC_flag = False,
PES_extension_flag = False,
PTS = pts,
# DTS = t, # wut
stuffing = ''),
data = data)
pes_data = PES_packet.build(pes)
self.write_pes_data(self.vid_es_pid, pes_data, pts)
def mux_latm(self, t, data):
pts = int(t * self.pts_clock)
pes = DefaultingContainer(
stream_id = 0b11000001, # audio stream number 1
header = DefaultingContainer(
PES_scrambling_control = 0,
PES_priority = 0,
data_alignment_indicator = True,
copyright = False,
original_or_copy = False,
PTS_DTS_flags = 2, # 3 if DTS else 2
ESCR_flag = False,
ES_rate_flag = False,
DSM_trick_mode_flag = False,
additional_copy_info_flag = False,
PES_CRC_flag = False,
PES_extension_flag = False,
PTS = pts,
stuffing = ''),
data = data)
pes_data = PES_packet.build(pes)
self.write_pes_data(self.aud_es_pid, pes_data, pts)
def write_pes_data(self, pid, data, ts=None):
pcr = ts if pid == self.pcr_pid else None
first_packet = True
while len(data):
pcr_v = None
if first_packet and pcr is not None:
pcr_v = Container(program_clock_reference_base = pcr, program_clock_reference_extension = 0)
field = None
if pcr_v:
field_length = 8
field = DefaultingContainer(
adaptation_field_length = field_length - 1,
disconuity_indicator = False,
random_access_indicator = False,
elementary_stream_priority_indicator = False,
PCR_flag = True,
OPCR_flag = False,
splicing_point_flag = False,
transport_private_data_flag = False,
adaptation_field_extension_flag = False,
PCR = pcr_v)
header_data = transport_packet_header.build(
DefaultingContainer(
transport_error_indicator = False,
payload_unit_start_indicator = first_packet,
transport_priority = False,
PID = pid,
transport_scrambling_control = 0,
adaptation_field_control = 3 if field else 1,
continuity_counter = self.continuity_counters[pid] % 16,
adaptation_field = field
)
)
data_slice = data[:transport_packet_length - len(header_data)]
data = data[len(data_slice):]
packet = header_data + data_slice
if len(packet) < transport_packet_length:
assert len(data) == 0
# last packet, pad it
# pad with an adaptation_field when the pes data length is not given...
# (otherwise we /could/ pad just pad the data with \xFF...)
padding_needed = transport_packet_length - len(packet)
if field:
field.adaptation_field_length += padding_needed
else:
assert pcr_v is None
if padding_needed == 1:
field = DefaultingContainer(adaptation_field_length = 0)
else:
field = DefaultingContainer(
adaptation_field_length = padding_needed-1,
disconuity_indicator = False,
random_access_indicator = False,
elementary_stream_priority_indicator = False,
PCR_flag = False,
OPCR_flag = False,
splicing_point_flag = False,
transport_private_data_flag = False,
adaptation_field_extension_flag = False,
)
header_data = transport_packet_header.build(
DefaultingContainer(
transport_error_indicator = False,
payload_unit_start_indicator = first_packet,
transport_priority = False,
PID = pid,
transport_scrambling_control = 0,
adaptation_field_control = 3,
continuity_counter = self.continuity_counters[pid] % 16,
adaptation_field = field
)
)
packet = header_data + data_slice
assert len(packet) == transport_packet_length
self.f.write(packet)
self.continuity_counters[pid] += 1
first_packet = False