def _read_id3v24_frame(self):
(frame_id, ) = struct.unpack('> 4s ', self.input_file.read(4))
size = utils.decode_bitwise_int(struct.unpack('> B B B B',
self.input_file.read(4)))
self.input_file.seek(2, io.SEEK_CUR) # Flags, not used
return self._read_id3_generic_frame(frame_id, size, 4)
def _read_id3v24_frame(self):
(frame_id, ) = struct.unpack('> 4s ', self.input_file.read(4))
size = utils.decode_bitwise_int(
struct.unpack('> B B B B', self.input_file.read(4)))
self.input_file.seek(2, io.SEEK_CUR) # Flags, not used
return self._read_id3_generic_frame(frame_id, size, 4)
def _read_id3v2_tags(self):
(mayor, minor) = struct.unpack('> B B', self.input_file.read(2))
#TODO Check if extended header (second bit from left), and skip
# In extended header, first 4 bytes are the size.
self.input_file.seek(1, io.SEEK_CUR) # Flags
size = utils.decode_bitwise_int(struct.unpack('> B B B B',
self.input_file.read(4)))
log.info(' Complete size: {}'.format(size))
header_size = 10 # For id3v2.3 and id3v2.4
if mayor == 2:
read_frame = self._read_id3v22_frame
header_size = 6
elif mayor == 3:
read_frame = self._read_id3v23_frame
elif mayor == 4:
read_frame = self._read_id3v24_frame
else: # pragma: no cover
raise Exception('ID3 version "2.{}" not supported'.format(mayor))
comments = {}
while size > 0:
# Remaining size is less than header size, must be padding
if size <= header_size:
self.input_file.seek(size, io.SEEK_CUR)
break
frame = read_frame()
size -= (frame.size + header_size)
if frame.comment: # Only use some frames
comments.update(frame.comment)
elif frame.size == 0: # Padding at the end of the frames
log.info('Found padding: {} bytes'.format(frame.size + size))
self.input_file.seek(size, io.SEEK_CUR)
size = 0
return comments
def _read_id3v2_tags(self):
(mayor, minor) = struct.unpack('> B B', self.input_file.read(2))
#TODO Check if extended header (second bit from left), and skip
# In extended header, first 4 bytes are the size.
self.input_file.seek(1, io.SEEK_CUR) # Flags
size = utils.decode_bitwise_int(
struct.unpack('> B B B B', self.input_file.read(4)))
log.info(' Complete size: {}'.format(size))
header_size = 10 # For id3v2.3 and id3v2.4
if mayor == 2:
read_frame = self._read_id3v22_frame
header_size = 6
elif mayor == 3:
read_frame = self._read_id3v23_frame
elif mayor == 4:
read_frame = self._read_id3v24_frame
else: # pragma: no cover
raise Exception('ID3 version "2.{}" not supported'.format(mayor))
comments = {}
while size > 0:
# Remaining size is less than header size, must be padding
if size <= header_size:
self.input_file.seek(size, io.SEEK_CUR)
break
frame = read_frame()
size -= (frame.size + header_size)
if frame.comment: # Only use some frames
comments.update(frame.comment)
elif frame.size == 0: # Padding at the end of the frames
log.info('Found padding: {} bytes'.format(frame.size + size))
self.input_file.seek(size, io.SEEK_CUR)
size = 0
return comments
