def __init__(self, fileobj):
"""Raises MusepackHeaderError"""
header = fileobj.read(4)
if len(header) != 4:
raise MusepackHeaderError("not a Musepack file")
# Skip ID3v2 tags
if header[:3] == b"ID3":
header = fileobj.read(6)
if len(header) != 6:
raise MusepackHeaderError("not a Musepack file")
size = 10 + BitPaddedInt(header[2:6])
fileobj.seek(size)
header = fileobj.read(4)
if len(header) != 4:
raise MusepackHeaderError("not a Musepack file")
if header.startswith(b"MPCK"):
self.__parse_sv8(fileobj)
else:
self.__parse_sv467(fileobj)
if not self.bitrate and self.length != 0:
fileobj.seek(0, 2)
self.bitrate = intround(fileobj.tell() * 8 / self.length)
def test_long(self):
if PY2:
data = BitPaddedInt.to_str(sys.maxint + 1, width=16)
val = BitPaddedInt(data)
self.assertEqual(val, sys.maxint + 1)
self.assertTrue(isinstance(val, BitPaddedLong))
else:
self.assertTrue(BitPaddedInt is BitPaddedLong)
def skip_id3(fileobj):
"""Might raise IOError"""
# WMP writes multiple id3s, so skip as many as we find
while True:
idata = fileobj.read(10)
try:
id3, insize = struct.unpack('>3sxxx4s', idata)
except struct.error:
id3, insize = b'', 0
insize = BitPaddedInt(insize)
if id3 == b'ID3' and insize > 0:
fileobj.seek(insize, 1)
else:
fileobj.seek(-len(idata), 1)
break
def __init__(self, fileobj):
"""Raises AACError"""
# skip id3v2 header
start_offset = 0
header = fileobj.read(10)
if header.startswith(b"ID3"):
size = BitPaddedInt(header[6:])
start_offset = size + 10
fileobj.seek(start_offset)
adif = fileobj.read(4)
if adif == b"ADIF":
self._parse_adif(fileobj)
self._type = "ADIF"
else:
self._parse_adts(fileobj, start_offset)
self._type = "ADTS"
def __check_header(self, fileobj, name):
"""Returns the offset of the flac block start
(skipping id3 tags if found). The passed fileobj will be advanced to
that offset as well.
"""
size = 4
header = fileobj.read(4)
if header != b"fLaC":
size = None
if header[:3] == b"ID3":
size = 14 + BitPaddedInt(fileobj.read(6)[2:])
fileobj.seek(size - 4)
if fileobj.read(4) != b"fLaC":
size = None
if size is None:
raise FLACNoHeaderError("%r is not a valid FLAC file" % name)
return size
def test_str_int_init(self):
self.assertEquals(BitPaddedInt(238).as_str(),
BitPaddedInt(struct.pack('>L', 238)).as_str())
def test_s32b(self):
self.assertEquals(BitPaddedInt(b'\xFF\xFF\xFF\xFF', bits=8).as_str(),
b'\xFF\xFF\xFF\xFF')
def test_32bi(self):
self.assertEquals(BitPaddedInt(0xFFFFFFFF, bits=8), 0xFFFFFFFF)
def test_32b(self):
self.assertEquals(BitPaddedInt(b'\xFF\xFF\xFF\xFF', bits=8),
0xFFFFFFFF)
def test_65(self):
self.assertEquals(BitPaddedInt(b'\x00\x00\x01\x81', 6), 0x41)
def test_129b(self):
self.assertEquals(BitPaddedInt(b'\x00\x00\x01\x81'), 0x81)
def test_1l(self):
self.assertEquals(
BitPaddedInt(b'\x01\x00\x00\x00', bigendian=False), 1)
def test_1(self):
self.assertEquals(BitPaddedInt(b'\x00\x00\x00\x01'), 1)
def test_zero(self):
self.assertEquals(BitPaddedInt(b'\x00\x00\x00\x00'), 0)
def test_promote_long(self):
l = BitPaddedInt(sys.maxint**2)
self.assertTrue(isinstance(l, long))
self.assertEqual(BitPaddedInt(l.as_str(width=-1)), l)