def as_values(self, raw_row):
"""Convert a row of raw bytes into a flat row. Result may
or may not share with argument"""
if self.bit_depth == 8:
return raw_row
if self.bit_depth == 16:
raw_row = tostring(raw_row)
return array('H', struct.unpack('!%dH' % (len(raw_row) // 2), raw_row))
assert self.bit_depth < 8
width = self.width
# Samples per byte
spb = 8 // self.bit_depth
out = array('B')
mask = 2 ** self.bit_depth - 1
shifts = map(self.bit_depth.__mul__, reversed(range(spb)))
for o in raw_row:
out.extend(map(lambda i: mask&(o>>i), shifts))
return out[:width]
def serialtoflat_16(self, bytes, width=None):
stringed_bytes = tostring(bytes)
return array('H', struct.unpack('!%dH' % (len(stringed_bytes)//2), stringed_bytes))