def __init__(self, fileobj, length):
"""Raises DescriptorError"""
r = BitReader(fileobj)
try:
self.objectTypeIndication = r.bits(8)
self.streamType = r.bits(6)
self.upStream = r.bits(1)
self.reserved = r.bits(1)
self.bufferSizeDB = r.bits(24)
self.maxBitrate = r.bits(32)
self.avgBitrate = r.bits(32)
if (self.objectTypeIndication, self.streamType) != (0x40, 0x5):
return
# all from here is optional
if length * 8 == r.get_position():
return
tag = r.bits(8)
except BitReaderError as e:
raise DescriptorError(e)
if tag == DecoderSpecificInfo.TAG:
assert r.is_aligned()
self.decSpecificInfo = DecoderSpecificInfo.parse(fileobj)
def __init__(self, fileobj, length):
"""Raises DescriptorError"""
r = BitReader(fileobj)
try:
self.objectTypeIndication = r.bits(8)
self.streamType = r.bits(6)
self.upStream = r.bits(1)
self.reserved = r.bits(1)
self.bufferSizeDB = r.bits(24)
self.maxBitrate = r.bits(32)
self.avgBitrate = r.bits(32)
if (self.objectTypeIndication, self.streamType) != (0x40, 0x5):
return
# all from here is optional
if length * 8 == r.get_position():
return
tag = r.bits(8)
except BitReaderError as e:
raise DescriptorError(e)
if tag == DecoderSpecificInfo.TAG:
assert r.is_aligned()
self.decSpecificInfo = DecoderSpecificInfo.parse(fileobj)
def find_stream(cls, fileobj, max_bytes):
"""Returns a possibly valid _ADTSStream or None.
Args:
max_bytes (int): maximum bytes to read
"""
r = BitReader(fileobj)
stream = cls(r)
if stream.sync(max_bytes):
stream.offset = (r.get_position() - 12) // 8
return stream
def find_stream(cls, fileobj, max_bytes):
"""Returns a possibly valid _ADTSStream or None.
Args:
max_bytes (int): maximum bytes to read
"""
r = BitReader(fileobj)
stream = cls(r)
if stream.sync(max_bytes):
stream.offset = (r.get_position() - 12) // 8
return stream
