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huffman.py
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huffman.py
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from util import create_array
from util import JPEG_NATURAL_ORDER
class Huffman(object):
BITS_DC_LUMINANCE = [0x00, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0x00]
BITS_DC_CHROMINANCE = [0x01, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0x00]
BITS_AC_LUMINANCE = [0x10, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d]
BITS_AC_CHROMINANCE = [0x11, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77]
BITS = [BITS_DC_LUMINANCE, BITS_AC_LUMINANCE,
BITS_DC_CHROMINANCE, BITS_AC_CHROMINANCE]
VAL_DC_LUMINANCE = range(12)
VAL_DC_CHROMINANCE = range(12)
VAL_AC_LUMINANCE = [
0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21,
0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71,
0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23, 0x42, 0xb1,
0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72,
0x82, 0x09, 0x0a, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x25,
0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x83,
0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93,
0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3,
0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3,
0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3,
0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1,
0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa
]
VAL_AC_CHROMINANCE = [
0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 0x31,
0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22,
0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 0xa1, 0xb1, 0xc1,
0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1,
0x0a, 0x16, 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18,
0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47,
0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a,
0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a,
0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,
0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba,
0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca,
0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa
]
VAL = [VAL_DC_LUMINANCE, VAL_AC_LUMINANCE,
VAL_DC_CHROMINANCE, VAL_AC_CHROMINANCE]
def __init__(self, width, height):
self.buffer_put_bits = 0
self.buffer_put_buffer = 0
self.image_widht = width
self.image_height = height
self.init_huf()
def init_huf(self):
self.dc_matrix = create_array(0, 2, 12, 2)
self.ac_matrix = create_array(0, 2, 255, 2)
def cal(bits, val, matrix):
p = 0
code = 0
for l in range(1, len(bits)):
for i in range(bits[l]):
matrix[val[p]] = (code, l)
p += 1
code += 1
code <<= 1
cal(self.BITS_DC_LUMINANCE, self.VAL_DC_LUMINANCE, self.dc_matrix[0])
cal(self.BITS_AC_LUMINANCE, self.VAL_AC_LUMINANCE, self.ac_matrix[0])
cal(self.BITS_DC_CHROMINANCE, self.VAL_DC_CHROMINANCE, self.dc_matrix[1])
cal(self.BITS_AC_CHROMINANCE, self.VAL_AC_CHROMINANCE, self.ac_matrix[1])
def write_byte(self, out, byte):
out.write(chr(byte))
def buffer_it(self, out, code, size):
put_buffer = code
put_bits = self.buffer_put_bits + size
put_buffer &= (1 << size) - 1
put_buffer <<= 24 - put_bits
put_buffer |= self.buffer_put_buffer
while put_bits >= 8:
c = put_buffer >> 16 & 0xff
self.write_byte(out, c)
if c == 0xff:
self.write_byte(out, 0)
put_buffer <<= 8
put_bits -= 8
self.buffer_put_buffer = put_buffer
self.buffer_put_bits = put_bits
def flush_buffer(self, out):
put_buffer = self.buffer_put_buffer
put_bits = self.buffer_put_bits
while put_bits > 0:
c = put_buffer >> 16 & 0xff
self.write_byte(out, c)
if c == 0xff:
self.write_byte(out, 0)
put_buffer <<= 8
put_bits -= 8
def huffman_block_encoder(self, out, zigzag, prec, dc_code, ac_code):
self.num_of_dc_tables = 2
self.num_of_ac_tables = 2
tmp = tmp2 = zigzag[0] - prec
if tmp < 0:
tmp = -tmp
tmp2 -= 1
nbits = 0
while tmp:
nbits += 1
tmp >>= 1
self.buffer_it(out, *self.dc_matrix[dc_code][nbits])
if nbits:
self.buffer_it(out, tmp2, nbits)
r = 0
for k in range(1, 64):
tmp = zigzag[JPEG_NATURAL_ORDER[k]]
if tmp == 0:
r += 1
else:
while r > 15:
self.buffer_it(out, *self.ac_matrix[ac_code][0xf0])
r -= 16
tmp2 = tmp
if tmp < 0:
tmp = -tmp
tmp2 -= 1
nbits = 1
tmp >>= 1
while tmp:
nbits += 1
tmp >>= 1
i = (r << 4) + nbits
self.buffer_it(out, *self.ac_matrix[ac_code][i])
self.buffer_it(out, tmp2, nbits)
r = 0
if r > 0:
self.buffer_it(out, *self.ac_matrix[ac_code][0])