def __init__(self, box: Box):
self.box = box
self.full_box = FullBox(box)
tr_flags = self.full_box.flags
self.sample_count = parse_big_endian_number(
self.full_box.reader.read(4))
if tr_flags & TRFlags.DATA_OFFSET_PRESENT:
self.full_box.reader.skip(4)
if tr_flags & TRFlags.FIRST_SAMPLE_FLAGS_PRESENT:
self.full_box.reader.skip(4)
if tr_flags & TRFlags.FIRST_SAMPLE_FLAGS_PRESENT:
self.full_box.reader.skip(4)
assert self.sample_count > 0
# First sample
if tr_flags & TRFlags.SAMPLE_DURATION_PRESENT:
self.full_box.reader.skip(4)
if tr_flags & TRFlags.SAMPLE_SIZE_PRESENT:
self.full_box.reader.skip(4)
if tr_flags & TRFlags.SAMPLE_FLAGS_PRESENT:
self.full_box.reader.skip(4)
if tr_flags & TRFlags.SAMPLE_COMPOSITION_TIME_OFFSETS_PRESENT:
self.first_sample_composition_time_offset = parse_signed_big_endian_number(
self.full_box.reader.read(4))
else:
self.first_sample_composition_time_offset = 0
def __init__(self, box: Box):
self.box = box
self.full_box = FullBox(box)
int_size = 8 if self.full_box.version == 1 else 4
self.full_box.reader.skip(2 *
int_size) # creation_time, modification_time
self.track_ID = parse_big_endian_number(self.full_box.reader.read(4))
def read_edit():
segment_duration = parse_big_endian_number(
self.full_box.reader.read(int_size))
media_time, = struct.unpack(">i",
self.full_box.reader.read(int_size))
self.full_box.reader.skip(4) # media_rate
return Edit(segment_duration, media_time)
def __init__(self, reader: ByteReader):
self.offset = reader.position
size = parse_big_endian_number(reader.read(4))
kind = reader.read(4)
if size == 1:
size = parse_big_endian_number(reader.read(8))
elif size == 0:
size = reader.end - reader.position
if kind == b"uuid":
kind += reader.read(16)
content_offset = reader.position
content_size = size - (content_offset - self.offset)
self.kind = kind
self.full_size = size
self.reader = RegionByteReader(reader, content_offset, content_size)
reader.skip(content_size)
def read_vint(reader: ByteReader, raw: bool = False):
header_byte = ord(reader.read(1))
if header_byte == 0:
raise WrongFile("VINT with zero header byte")
tail_length = 0
mask = 0x80
while header_byte & mask == 0:
tail_length += 1
mask >>= 1
header_number_part = header_byte & ~mask if not raw else header_byte
return parse_big_endian_number(
bytes([header_number_part]) + reader.read(tail_length))
def __init__(self, box: Box):
self.box = box
self.full_box = FullBox(box)
int_size = 8 if self.full_box.version == 1 else 4
entry_count = parse_big_endian_number(self.full_box.reader.read(4))
def read_edit():
segment_duration = parse_big_endian_number(
self.full_box.reader.read(int_size))
media_time, = struct.unpack(">i",
self.full_box.reader.read(int_size))
self.full_box.reader.skip(4) # media_rate
return Edit(segment_duration, media_time)
self.edits = [read_edit() for _ in range(entry_count)]
def __init__(self, box: Box):
self.box = box
self.version = parse_big_endian_number(box.reader.read(1))
self.flags = parse_big_endian_number(box.reader.read(3))
self.reader = RegionByteReader(box.reader, box.reader.position,
box.reader.size - 4)
def __init__(self, box: Box):
self.box = box
self.full_box = FullBox(box)
int_size = 8 if self.full_box.version == 1 else 4
self.base_media_decode_time = parse_big_endian_number(
self.full_box.reader.read(int_size))