def load(fh, position, end):
if position is None:
position = fh.tell()
fh.seek(position)
header_size = 8
size = struct.unpack(">I", fh.read(4))[0]
name = fh.read(4)
if name not in constants.CONTAINERS_LIST:
if name == constants.TAG_SA3D:
return sa3d.load(fh, position, end)
else:
return box.load(fh, position, end)
if size == 1:
size = struct.unpack(">Q", fh.read(8))[0]
header_size = 16
if size < 8:
print "Error, invalid size in ", name, " at ", position
return None
if (position + size) > end:
print "Error: Container box size exceeds bounds."
return None
padding = 0
if name == constants.TAG_STSD:
padding = 8
if name in constants.SOUND_SAMPLE_DESCRIPTIONS:
current_pos = fh.tell()
fh.seek(current_pos + 8)
sample_description_version = struct.unpack(">h", fh.read(2))[0]
fh.seek(current_pos)
if sample_description_version == 0:
padding = 28
elif sample_description_version == 1:
padding = 28 + 16
elif sample_description_version == 2:
padding = 56
else:
print("Unsupported sample description version:",
sample_description_version)
new_box = Container()
new_box.name = name
new_box.position = position
new_box.header_size = header_size
new_box.content_size = size - header_size
new_box.padding = padding
new_box.contents = load_multiple(
fh, position + header_size + padding, position + size)
if new_box.contents is None:
return None
return new_box
def load(fh, position, end):
if position is None:
position = fh.tell()
fh.seek(position)
header_size = 8
size = struct.unpack(">I", fh.read(4))[0]
name = fh.read(4)
if name not in constants.CONTAINERS_LIST:
if name == constants.TAG_SA3D:
return sa3d.load(fh, position, end)
else:
return box.load(fh, position, end)
if size == 1:
size = struct.unpack(">Q", fh.read(8))[0]
header_size = 16
if size < 8:
print "Error, invalid size in ", name, " at ", position
return None
if (position + size) > end:
print "Error: Container box size exceeds bounds."
return None
padding = 0
stsd_version = 0
if (name == constants.TAG_STSD):
padding = 8
if (name == constants.TAG_MP4A):
current_pos = fh.tell()
fh.seek(current_pos + 8)
sample_description_version = struct.unpack(">h", fh.read(2))[0]
fh.seek(current_pos)
if sample_description_version == 1:
padding = 28 + 16 # Mov
else:
padding = 28 # Mp4
new_box = Container()
new_box.name = name
new_box.position = position
new_box.header_size = header_size
new_box.content_size = size - header_size
new_box.padding = padding
new_box.contents = load_multiple(fh, position + header_size + padding,
position + size)
if new_box.contents is None:
return None
return new_box
def load(fh, position=None, end=None):
if position is None:
position = fh.tell()
fh.seek(position)
header_size = 8
size = struct.unpack(">I", fh.read(4))[0]
name = fh.read(4)
if name not in constants.CONTAINERS_LIST:
return box.load(fh, position, end)
if size == 1:
size = struct.unpack(">Q", fh.read(8))[0]
header_size = 16
if size < 8:
print "Error, invalid size in ", name, " at ", position
return None
if (position + size) > end:
print "Error: Container box size exceeds bounds."
return None
new_box = Container()
new_box.name = name
new_box.position = position
new_box.header_size = header_size
new_box.content_size = size - header_size
new_box.contents = load_multiple(
fh, position + header_size, position + size)
if new_box.contents is None:
return None
return new_box
def load(fh, position, end):
if position is None:
position = fh.tell()
fh.seek(position)
header_size = 8
size = struct.unpack(">I", fh.read(4))[0]
name = fh.read(4).decode()
is_box = name not in constants.CONTAINERS_LIST
# Handle the mp4a decompressor setting (wave -> mp4a).
if name == constants.TAG_MP4A and size == 12:
is_box = True
if is_box:
if name == constants.TAG_SA3D:
return sa3d.load(fh, position, end)
return box.load(fh, position, end)
if size == 1:
size = struct.unpack(">Q", fh.read(8))[0]
header_size = 16
if size < 8:
print("Error, invalid size", size, "in", name, "at", position)
return None
if (position + size) > end:
print("Error: Container box size exceeds bounds.")
return None
padding = 0
if name == constants.TAG_STSD:
padding = 8
if name in constants.SOUND_SAMPLE_DESCRIPTIONS:
current_pos = fh.tell()
fh.seek(current_pos + 8)
sample_description_version = struct.unpack(">h", fh.read(2))[0]
fh.seek(current_pos)
if sample_description_version == 0:
padding = 28
elif sample_description_version == 1:
padding = 28 + 16
elif sample_description_version == 2:
padding = 64
else:
print("Unsupported sample description version:",
sample_description_version)
new_box = Container()
new_box.name = name
new_box.position = position
new_box.header_size = header_size
new_box.content_size = size - header_size
new_box.padding = padding
new_box.contents = load_multiple(fh, position + header_size + padding,
position + size)
if new_box.contents is None:
return None
return new_box
