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jp2codestream.py
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jp2codestream.py
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#!/usr/bin/python
# $Id: jp2codestream.py,v 1.47 2019/07/26 07:08:26 thor Exp $
import sys
from jp2utils import *
#
# Some Exceptions
#
class InvalidMarker(JP2Error):
def __init__(self, marker):
JP2Error.__init__(self, 'marker 0xff%s can\'t appear here' % (marker))
self.marker = marker
class InvalidSizedMarker(JP2Error):
def __init__(self, marker):
JP2Error.__init__(self, 'invalid sized marker %s' % (marker))
self.marker = marker
class InvalidMarkerField(JP2Error):
def __init__(self, marker, field):
JP2Error.__init__(self, 'invalid field %s in marker %s' % (field, marker))
self.marker = marker
self.field = field
class RequiredMarkerMissing(JP2Error):
def __init__(self, marker):
JP2Error.__init__(self, 'required marker 0xff%s missing' % (marker))
self.marker = marker
class UnexpectedEOC(JP2Error):
def __init__(self):
JP2Error.__init__(self, 'unexpected end of codestream')
class MisplacedData(JP2Error):
def __init__(self):
JP2Error.__init__(self, 'marker expected')
#
# The Codestream Class
#
class JP2Codestream:
def __init__(self, indent = 0):
self.indent = indent
self.datacount = 0
self.bytecount = 0
self.offset = 0
def print_indent(self, buffer, nl = 1):
print_indent(buffer, self.indent, nl)
def print_header(self, header, content):
self.headers.append((header, content))
def print_data(self, count):
if count > 0:
self.datacount = self.datacount + count
self.bytecount = self.bytecount + count
self.print_indent("Data : %d bytes" % (count))
print
def new_marker(self, name, description):
self.print_indent("%-8s: New marker: %s (%s)" % \
(str(self.pos-2 + self.offset),name, description))
print
self.indent = self.indent + 1
self.headers = []
def end_marker(self):
self.flush_marker()
self.indent = self.indent - 1
def flush_marker(self):
if len(self.headers) > 0:
maxlen = 0
for header in self.headers:
maxlen = max(maxlen, len(header[0]))
for header in self.headers:
s = ""
for i in range(maxlen - len(header[0])):
s = s + " "
self.print_indent("%s%s : %s" % (header[0], s, header[1]))
print
self.headers = []
def parse(self, buffer, startpos):
self.buffer = buffer
self.pos = 0
self.datacount = 0
self.offset = startpos
# Read SOC Marker
if len(self.buffer) - self.pos < 2:
raise RequiredMarkerMissing("SOC")
if ord(self.buffer[self.pos + 0]) != 0xff or \
ord(self.buffer[self.pos + 1]) != 0x4f:
raise RequiredMarkerMissing("SOC")
self.pos = self.pos + 2
self.read_SOC()
# Read SIZ Marker
if len(self.buffer) - self.pos < 2:
raise RequiredMarkerMissing("SIZ")
if ord(self.buffer[self.pos + 0]) != 0xff or \
ord(self.buffer[self.pos + 1]) != 0x51:
raise RequiredMarkerMissing("SIZ")
self.pos = self.pos + 2
self.read_SIZ()
# Read other header markers
while len(self.buffer) - self.pos >= 2 and \
ord(self.buffer[self.pos + 1]) != 0x90:
if ord(self.buffer[self.pos + 0]) != 0xff:
raise MisplacedData()
if len(self.buffer) - self.pos < 4:
raise UnexpectedEOC()
self.read_header_marker()
# Read Tile Parts
while len(self.buffer) - self.pos >= 2 and \
ord(self.buffer[self.pos + 0]) == 0xff and \
ord(self.buffer[self.pos + 1]) == 0x90:
self.pos = self.pos + 2
self.read_SOT()
# Read Next Marker
while len(self.buffer) - self.pos >= 2 and \
ord(self.buffer[self.pos + 1]) != 0x93: # SOD
if ord(self.buffer[self.pos + 0]) != 0xff:
raise MisplacedData()
if len(self.buffer) - self.pos < 4:
raise UnexpectedEOC()
self.read_header_marker()
if len(self.buffer) - self.pos < 2:
raise UnexpectedEOC()
self.pos = self.pos + 2
self.new_marker("SOD", "Start of data")
self.end_marker()
self.parse_data()
if len(self.buffer) - self.pos > 0:
raise MisplacedData()
l = len(self.buffer)
oh = l - self.datacount
self.print_indent("Size : %d bytes" % (l))
self.print_indent("Data Size : %d bytes" % (self.datacount))
self.print_indent("Overhead : %d bytes (%d%%)" % (oh, 100 * oh / l))
def load_marker(self, file, marker):
mrk = ((ord(marker[0]) << 8) +
(ord(marker[1]) << 0))
if (mrk >= 0xff30 and mrk <= 0xff3f):
self.buffer = marker
elif (mrk == 0xff93 or mrk == 0xff4f or mrk == 0xffd9 or mrk == 0xff92):
self.buffer = marker
elif (mrk >= 0xff4f and mrk <= 0xff93):
size = file.read(2)
ln = ((ord(size[0]) << 8) +
(ord(size[1]) << 0))
if (ln < 2):
raise InvalidSizedMarker("Marker too short")
self.buffer = marker + size + file.read(ln-2)
if len(self.buffer) != ln + 2:
raise UnexpectedEOC()
else:
raise MisplacedData()
self.bytecount = self.bytecount + len(self.buffer)
self.pos = 0
def load_buffer(self, file):
marker = file.read(2)
if len(marker) == 0:
self.buffer = []
else:
if len(marker) < 2:
raise UnexpectedEOC()
self.load_marker(file,marker)
def stream_parse(self, file, startpos):
self.pos = 0
self.datacount = 0
self.bytecount = 0
self.offset = startpos
# Read SOC Marker
self.load_buffer(file)
if ord(self.buffer[self.pos + 0]) != 0xff or \
ord(self.buffer[self.pos + 1]) != 0x4f:
raise RequiredMarkerMissing("SOC")
self.pos = self.pos + 2
self.read_SOC()
self.offset = self.offset + len(self.buffer)
# Read SIZ Marker
self.load_buffer(file)
if ord(self.buffer[self.pos + 0]) != 0xff or \
ord(self.buffer[self.pos + 1]) != 0x51:
raise RequiredMarkerMissing("SIZ")
self.pos = self.pos + 2
self.read_SIZ()
self.offset = self.offset + len(self.buffer)
# Read other header markers
self.load_buffer(file)
while len(self.buffer) - self.pos >= 2 and \
ord(self.buffer[self.pos + 1]) != 0x90:
if ord(self.buffer[self.pos + 0]) != 0xff:
raise MisplacedData()
if len(self.buffer) - self.pos < 4:
raise UnexpectedEOC()
self.read_header_marker()
self.offset = self.offset + len(self.buffer)
self.load_buffer(file)
# Read Tile Parts
while len(self.buffer) >= 2 and \
ord(self.buffer[0]) == 0xff and \
ord(self.buffer[1]) == 0x90:
self.pos = self.pos + 2
self.read_SOT()
self.offset = self.offset + len(self.buffer)
self.load_buffer(file)
# Read Next Marker
while len(self.buffer) >= 2 and \
ord(self.buffer[self.pos + 1]) != 0x93: # SOD
if ord(self.buffer[self.pos + 0]) != 0xff:
raise MisplacedData()
if len(self.buffer) - self.pos < 4:
raise UnexpectedEOC()
self.read_header_marker()
self.offset = self.offset + len(self.buffer)
self.load_buffer(file)
self.offset = self.offset + len(self.buffer)
self.new_marker("SOD", "Start of data")
self.end_marker()
self.stream_data(file)
if len(self.buffer) - self.pos > 0:
raise MisplacedData()
oh = self.bytecount - self.datacount
self.print_indent("Size : %d bytes" % (self.bytecount))
self.print_indent("Data Size : %d bytes" % (self.datacount))
self.print_indent("Overhead : %d bytes (%d%%)" % (oh, 100 * oh / self.bytecount))
def stream_data(self,file):
count = 0
while 1:
byte = file.read(1)
if len(byte) != 1:
raise UnexpectedEOC()
count = count + 1
if (ord(byte[0]) == 0xff):
marker = file.read(1)
if len(marker) == 1:
count = count + 1
if ord(marker[0]) >= 0x90:
self.offset = self.offset + count-2
self.print_data(count-2)
self.load_marker(file,byte+marker)
if self.read_data_marker():
break
self.offset = self.offset + len(self.buffer)
count = 0
def parse_data(self, buffer = None):
if buffer:
self.buffer = buffer
self.pos = 0
while 1:
count = 0
while len(self.buffer) - self.pos >= 2 and \
(ord(self.buffer[self.pos + 0]) != 0xff or \
ord(self.buffer[self.pos + 1]) < 0x90):
self.pos = self.pos + 1
count = count + 1
if len(self.buffer) - self.pos == 1:
self.pos = self.pos + 1
count = count + 1
self.print_data(count)
if len(self.buffer) - self.pos == 0:
return
if len(self.buffer) - self.pos < 2:
raise UnexpectedEOC()
# Read Marker
if self.read_data_marker():
break
def read_SGco(self):
if len(self.buffer) - self.pos < 4:
raise InvalidSizedMarker("SGco")
self.print_header("Progression Order",
self.progression_order(ord(self.buffer[self.pos + 0])))
self.print_header("Layers",str(ordw(self.buffer[self.pos + 1:self.pos + 3])))
trafo = ord(self.buffer[self.pos + 3])
if trafo == 0:
s = "none"
elif trafo == 1:
s = "components 0,1,2"
elif trafo == 2:
s = "generic array based transform"
elif trafo == 4:
s = "wavelet based transform"
elif trafo == 6:
s = "array and wavelet based transform"
else:
s = str(ord(self.buffer[self.pos + 3]))
self.print_header("Multiple Component Transformation", s)
self.pos = self.pos + 4
def read_SPco(self, precincts):
if len(self.buffer) - self.pos < 5 + precincts:
raise InvalidSizedMarker("SPco")
levels = ord(self.buffer[self.pos + 0])
if levels <= 32:
self.print_header("Decomposition Levels", str(levels))
else:
self.print_header("Downsampling factor style", str(levels))
self.print_header("Code-block size", "%dx%d" % \
(1 << (ord(self.buffer[self.pos + 1]) + 2),
1 << (ord(self.buffer[self.pos + 2]) + 2)))
x = ord(self.buffer[self.pos + 3])
if x & 0x01:
s = "yes"
else:
s = "no"
self.print_header("Selective Arithmetic Coding Bypass", s)
if x & 0x02:
s = "yes"
else:
s = "no"
self.print_header("Reset Context Probabilities", s)
if x & 0x04:
s = "yes"
else:
s = "no"
self.print_header("Termination on Each Coding Pass", s)
if x & 0x08:
s = "yes"
else:
s = "no"
self.print_header("Vertically Causal Context", s)
if x & 0x10:
s = "yes"
else:
s = "no"
self.print_header("Predictable Termination", s)
if x & 0x20:
s = "yes"
else:
s = "no"
self.print_header("Segmentation Symbols", s)
if x & 0x40:
s = "FBCOT (Part 15)"
else:
s = "EBCOT"
self.print_header("Entropy Coding", s)
if x & 0x40:
if x & 0x80:
s = "yes"
else:
s = "no"
self.print_header("Mixing of FBCOT and EBCOT",s)
if ord(self.buffer[self.pos + 4]) == 0x00:
s = "9-7 irreversible"
elif ord(self.buffer[self.pos + 4]) == 0x01:
s = "5-3 reversible"
else:
s = "abritrary ATK specified transform"
self.print_header("Wavelet Transformation", s)
for i in range(precincts):
x = ord(self.buffer[self.pos + i + 5])
self.print_header("Precinct #%d Size Exponents" % (i),
"%dx%d" % (x & 0x0f, x >> 4))
self.pos = self.pos + 5 + precincts
def read_SOC(self):
self.new_marker("SOC", "Start of codestream")
self.end_marker()
def read_NSI(self):
self.new_marker("NSI", "Additional Dimansion Image and Tile Size")
size = ordw(self.buffer[self.pos + 0:self.pos + 2])
if size < 20 or size > 16403:
raise InvalidSizedMarker("NSI")
ndim = ord(self.buffer[self.pos + 2])
zsiz = ordl(self.buffer[self.pos + 3:self.pos + 7])
osiz = ordl(self.buffer[self.pos + 7:self.pos + 11])
tsiz = ordl(self.buffer[self.pos + 11:self.pos + 15])
tosz = ordl(self.buffer[self.pos + 15:self.pos + 19])
self.print_header("Dimensionality","%d" % ndim)
self.print_header("Image Depth","%d" % zsiz)
self.print_header("Image Depth Offset","%d" % osiz)
self.print_header("Tile Depth","%d" % tsiz)
self.print_header("Tile Depth Offset","%d" % tosz)
for i in range(size - 19):
self.print_header("Z Sample Separation for component %d" % i,"%d" % ord(self.buffer[self.pos + 19 + i]))
self.pos = self.pos + size
self.end_marker()
def read_SIZ(self):
self.new_marker("SIZ", "Image and tile size")
size = ordw(self.buffer[self.pos + 0:self.pos + 2])
if size < 41:
raise InvalidSizedMarker("SIZ")
if (size - 38) % 3 != 0:
raise InvalidSizedMarker("SIZ")
# Read Csiz
components = (size - 38) / 3
self.csiz = ordw(self.buffer[self.pos + 36:self.pos + 38])
if self.csiz != components:
raise InvalidSizedMarker("SIZ")
# Read Rsiz
rsiz = ordw(self.buffer[self.pos + 2:self.pos + 4])
if rsiz == 0:
s = "JPEG2000 full standard"
elif rsiz == 1:
s = "JPEG2000 profile 0"
elif rsiz == 2:
s = "JPEG2000 profile 1"
elif rsiz == 3:
s = "DCI 2K profile"
elif rsiz == 4:
s = "DCI 4K profile"
elif rsiz == 5:
s = "DCI long term storage profile"
elif rsiz == 6:
s = "DCI 2K scalable profile"
elif rsiz & (1 << 14):
s = "JPEG2000 part 15"
elif rsiz & (1 << 15):
s = "JPEG2000 part 2"
if rsiz & (1 << 11):
s += " Precinct dependent QNT"
if rsiz & (1 << 10):
s += " Arbitrary ROIs"
if rsiz & (1 << 9):
s += " NLT transform"
if rsiz & (1 << 8):
s += " Multi-component transform"
if rsiz & (1 << 7):
s += " WSS transformation kernel"
if rsiz & (1 << 6):
s += " Arbitrary kernel"
if rsiz & (1 << 5):
s += " Arbitrary decomposition"
if rsiz & (1 << 4):
s += " Single sample overlap"
if rsiz & (1 << 3):
s += " Visual masking"
if rsiz & (1 << 2):
s += " Trellis quantization"
if rsiz & (1 << 1):
s += " Variable scalar quantization"
if rsiz & (1 << 0):
s += " Variable DC offset"
else:
s = "unknown"
self.print_header("Required Capabilities", s)
# Read Xsiz and Ysiz
xsiz = ordl(self.buffer[self.pos + 4:self.pos + 8])
ysiz = ordl(self.buffer[self.pos + 8:self.pos + 12])
self.print_header("Reference Grid Size", "%dx%d" % (xsiz, ysiz))
# Read XOsiz and YOsiz
xosiz = ordl(self.buffer[self.pos + 12:self.pos + 16])
yosiz = ordl(self.buffer[self.pos + 16:self.pos + 20])
self.print_header("Image Offset", "%dx%d" % (xosiz, yosiz))
# Read XTsiz and YTsiz
xtsiz = ordl(self.buffer[self.pos + 20:self.pos + 24])
ytsiz = ordl(self.buffer[self.pos + 24:self.pos + 28])
self.print_header("Reference Tile Size","%dx%d" % (xtsiz, ytsiz))
# Read XTOsiz and YTOsiz
xtosiz = ordl(self.buffer[self.pos + 28:self.pos + 32])
ytosiz = ordl(self.buffer[self.pos + 32:self.pos + 36])
self.print_header("Reference Tile Offset", "%dx%d" % (xtosiz, ytosiz))
# Csiz (already read)
self.print_header("Components", str(components))
# Read Components
for i in range(0, components):
ssiz = ord(self.buffer[self.pos + 38 + i * 3])
xrsiz = ord(self.buffer[self.pos + 39 + i * 3])
yrsiz = ord(self.buffer[self.pos + 40 + i * 3])
self.print_header("Component #%d Depth" % (i), "%d" % ((ssiz & 0x7f) + 1))
if ssiz & 0x80:
s = "yes"
else:
s = "no"
self.print_header("Component #%d Signed" % (i), s)
self.print_header("Component #%d Sample Separation" % (i),
"%dx%d" % (xrsiz, yrsiz))
self.end_marker()
self.pos = self.pos + size
def read_SOT(self):
self.new_marker("SOT", "Start of tile-part")
if len(self.buffer) - self.pos < 10:
raise InvalidSizedMarker("SOT")
size = ordw(self.buffer[self.pos + 0:self.pos + 2])
if size != 10:
raise InvalidSizedMarker("SOT")
self.print_header("Tile",str(ordw(self.buffer[self.pos + 2:self.pos + 4])))
length = ordl(self.buffer[self.pos + 4:self.pos + 8])
self.print_header("Length", str(length))
self.print_header("Index", str(ord(self.buffer[self.pos + 8])))
if ord(self.buffer[self.pos + 9]) == 0:
s = "unknown"
else:
s = str(ord(self.buffer[self.pos + 9]))
self.print_header("Tile-Parts", s)
self.end_marker()
self.pos = self.pos + 10
def read_COD(self):
self.new_marker("COD", "Coding style default")
if self.size < 3:
raise InvalidSizedMarker("COD")
cod = ord(self.buffer[self.pos + 2])
if cod & 0x01:
s = "no"
else:
s = "yes"
self.print_header("Default Precincts of 2^15x2^15", s)
if cod & 0x02:
s = "yes"
else:
s = "no"
self.print_header("SOP Marker Segments", s)
if cod & 0x04:
s = "yes"
else:
s = "no"
self.print_header("EPH Marker Segments", s)
if cod & 0x08:
s = "1";
else:
s = "0";
self.print_header("Codeblock X offset", s);
if cod & 0x10:
s = "1";
else:
s = "0";
self.print_header("Codeblock Y offset", s);
self.print_header("All Flags", "%08x" % (cod))
self.pos = self.pos + 3
self.read_SGco()
self.read_SPco(self.size - 12)
self.end_marker()
def read_COC(self):
self.new_marker("COC", "Coding style component")
if self.csiz <= 256 and self.size < 9 or \
self.csiz > 256 and self.size < 10:
raise InvalidSizedMarker("COC")
self.pos = self.pos + 2
# Print Ccoc
if self.csiz <= 256:
component = ord(self.buffer[self.pos + 0])
self.pos = self.pos + 1
else:
component = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.pos = self.pos + 2
self.print_header("Component", str(component))
# Print Scoc
prec = ord(self.buffer[self.pos + 0])
self.pos = self.pos + 1
if prec == 0:
s = "default"
elif prec == 1:
s = "custom"
else:
s = "unknown"
self.print_header("Precincts", s)
# Print SPcoc
if prec == 0:
if self.csiz <= 256 and self.size != 9 or \
self.csiz > 256 and self.size != 10:
raise InvalidMarkerSize("COC")
precincts = self.size - 9
if self.csiz > 256:
precincts = precincts - 1
self.read_SPco(precincts)
self.end_marker()
def read_QCD(self):
self.new_marker("QCD", "Quantization default")
if self.size < 4:
raise InvalidSizedMarker("QCD")
sqcd = ord(self.buffer[self.pos + 2])
if sqcd & 0x1f == 0:
s = "none"
elif sqcd & 0x1f == 1:
s = "scalar derived"
elif sqcd & 0x1f == 2:
s = "scalar expounded"
elif sqcd & 0x1f == 3:
s = "variable deadzone scalar derived"
elif sqcd & 0x1f == 4:
s = "variable deadzone scalar expounded"
elif sqcd & 0x1f == 5:
s = "variable deadzone scalar expounded"
elif sqcd & 0x1f == 9:
s = "trellis quantization derived"
elif sqcd & 0x1f == 10:
s = "trellis quantization expounded"
else:
s = "unknown"
self.print_header("Quantization Type", s)
self.print_header("Guard Bits", str(sqcd >> 5))
subbands = self.size - 3
if sqcd & 0x1f == 1 or sqcd & 0x1f == 2:
if subbands % 2 != 0:
raise InvalidSizedMarker("QCD")
subbands = subbands / 2
for i in range(subbands):
mantissa = 1.0
if sqcd & 0x1f == 1 or sqcd & 0x1f == 2:
spqcd = ordw(self.buffer[self.pos + i * 2 + 3:self.pos + i * 2 + 5])
mantissa = 1.0 + ((spqcd & 0x7ff) / 2048.0)
self.print_header("Mantissa #%d" % (i), str(spqcd & 0x7ff))
exponent = spqcd >> 11
else:
spqcd = ord(self.buffer[self.pos + i + 3])
exponent = spqcd >> 3
self.print_header("Exponent #%d" % (i), str(exponent))
self.print_header("Delta #%d" % (i), str(mantissa * pow(2.0,-exponent)))
self.end_marker()
self.pos = self.pos + self.size
def read_QCC(self):
self.new_marker("QCC", "Quantization component")
if self.size < 4:
raise InvalidSizedMarker("QCC")
if self.csiz <= 256:
index = ord(self.buffer[self.pos + 2])
self.pos = self.pos + 3
else:
index = ordw(self.buffer[self.pos + 2:self.pos + 4])
self.pos = self.pos + 4
self.print_header("Index", str(index))
sqcc = ord(self.buffer[self.pos + 0])
self.pos = self.pos + 1
if sqcc & 0x1f == 0:
s = "none"
elif sqcc & 0x1f == 1:
s = "scalar derived"
elif sqcc & 0x1f == 2:
s = "scalar expounded"
else:
s = "unknown"
self.print_header("Quantization Type", s)
self.print_header("Guard Bits", str(sqcc >> 5))
if self.csiz <= 256:
subbands = self.size - 4
else:
subbands = self.size - 5
if sqcc & 0x1f == 1 or sqcc & 0x1f == 2:
if subbands % 2 != 0:
raise InvalidSizedMarker("QCC")
subbands = subbands / 2
for i in range(subbands):
mantissa = 1.0
if sqcc & 0x1f == 1 or sqcc & 0x1f == 2:
spqcd = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.pos = self.pos + 2
mantissa = 1.0 + ((spqcd & 0x7ff) / 2048.0)
self.print_header("Mantissa #%d" % (i), str(spqcd & 0x7ff))
exponent = spqcd >> 11
else:
spqcd = ord(self.buffer[self.pos + 0])
self.pos = self.pos + 1
exponent = spqcd >> 3
self.print_header("Exponent #%d" % (i), str(exponent))
self.print_header("Delta #%d" % (i), mantissa * pow(2.0,-exponent))
self.end_marker()
def read_RGN(self):
self.new_marker("RGN", "Region-of-interest")
# Print Crgn
if self.csiz <= 256:
cmp = ord(self.buffer[self.pos + 2])
self.pos = self.pos + 3
else:
cmp = ordw(self.buffer[self.pos + 2:self.pos + 4])
self.pos = self.pos + 4
self.print_header("Component", str(cmp))
method = ord(self.buffer[self.pos + 0])
if method == 0:
s = "implicit"
elif method == 1:
s = "rectangle"
elif method == 2:
s = "ellipse"
else:
s = str(method)
self.pos = self.pos + 1
self.print_header("Style", s)
self.print_header("Implicit ROI Shift",
str(ord(self.buffer[self.pos + 0])))
self.pos = self.pos + 1
self.end_marker()
def read_POC(self):
self.new_marker("POC", "Progression order change")
if self.size < 9:
raise InvalidSizedMarker("POC")
if self.csiz <= 256:
if (self.size - 2) % 7 != 0:
raise InvalidSizedMarker("POC")
num = (self.size - 2) / 7
else:
if (self.size - 2) % 9 != 0:
raise InvalidSizedMarker("POC")
num = (self.size - 2) / 9
self.pos = self.pos + 2
for i in range(num):
self.print_header("Resolution Level Index #%d (Start)" % (i),
str(ord(self.buffer[self.pos])))
if self.csiz <= 256:
rspoc = ord(self.buffer[self.pos + 1])
self.pos = self.pos + 2
else:
rspoc = ordw(self.buffer[self.pos + 1:self.pos + 3])
self.pos = self.pos + 3
self.print_header("Component Index #%d (Start)" % (i), str(rspoc))
lyepoc = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.print_header("Layer Index #%d (End)" % (i), str(lyepoc))
self.print_header("Resolution Level Index #%d (End)" % (i),
str(ord(self.buffer[self.pos + 2])))
if self.csiz <= 256:
cepoc = ord(self.buffer[self.pos + 3])
if cepoc == 0:
cepoc = 256
self.pos = self.pos + 4
else:
cepoc = ordw(self.buffer[self.pos + 3:self.pos + 5])
if cepoc == 0:
cepoc = 16384
self.pos = self.pos + 5
self.print_header("Component Index #%d (End)" % (i), str(cepoc))
po = self.progression_order(ord(self.buffer[self.pos]))
self.print_header("Progression Order #%d" % (i), po)
self.pos = self.pos + 1
self.end_marker()
def read_PPM(self):
self.new_marker("PPM", "Packed packet headers, main header")
if self.size < 3:
raise InvalidSizedMarker("PPM")
self.print_header("Index Zppm", str(ord(self.buffer[self.pos + 2])))
self.print_header("Marker Length Lppm", str(self.size))
self.end_marker()
self.pos = self.pos + self.size
def read_PPT(self):
self.new_marker("PPT", "Packed packet headers, tile-part header")
if self.size < 3:
raise InvalidSizedMarker("PPT")
self.print_header("Index", str(ord(self.buffer[self.pos + 2])))
self.print_header("Contents", "")
self.flush_marker()
restlen = self.size - 3
self.pos = self.pos + 3
cs = JP2Codestream(self.indent + 1)
cs.parse_data(self.buffer[self.pos:self.pos + restlen])
self.datacount = self.datacount + cs.datacount
self.end_marker()
self.pos = self.pos + restlen
def read_SOP(self):
self.new_marker("SOP", "Start of packet")
if self.size != 4:
raise InvalidSizedMarker("SOP")
self.print_header("Sequence" ,
str(ordw(self.buffer[self.pos + 2:self.pos + 4])))
self.end_marker()
self.pos = self.pos + self.size
def read_EPH(self):
self.new_marker("EPH", "End of packet header")
self.end_marker()
def read_TLM(self):
self.new_marker("TLM", "Tile-part length")
if self.size < 4:
raise InvalidSizedMarker("TLM")
self.print_header("Index", str(ord(self.buffer[self.pos + 2])))
stlm = ord(self.buffer[self.pos + 3]) >> 4
st = stlm & 0x03
sp = (stlm >> 2) & 0x1
if st == 3:
raise InvalidMarkerField("TLM", "Stlm")
if st == 0:
if sp == 0:
if (self.size - 4) % 2 != 0:
raise InvalidSizedMarker("TLM")
tileparts = (self.size - 4) / 2
else:
if (self.size - 4) % 4 != 0:
raise InvalidSizedMarker("TLM")
tileparts = (self.size - 4) / 4
elif st == 1:
if sp == 0:
if (self.size - 4) % 3 != 0:
raise InvalidSizedMarker("TLM")
tileparts = (self.size - 4) / 3
else:
if (self.size - 4) % 5 != 0:
raise InvalidSizedMarker("TLM")
tileparts = (self.size - 4) / 5
else:
if sp == 0:
if (self.size - 4) % 4 != 0:
raise InvalidSizedMarker("TLM")
tileparts = (self.size - 4) / 4
else:
if (self.size - 4) % 6 != 0:
raise InvalidSizedMarker("TLM")
tileparts = (self.size - 4) / 6
self.pos = self.pos + 4
for i in range(tileparts):
if st == 0:
ttlm = "in order"
if st == 1:
ttlm = str(ord(self.buffer[self.pos + 0]))
self.pos = self.pos + 1
elif st == 2:
ttlm = str(ordw(self.buffer[self.pos + 0:self.pos + 2]))
self.pos = self.pos + 2
self.print_header("Tile index #%d" % (i), ttlm)
if sp == 0:
length = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.pos = self.pos + 2
else:
length = ordl(self.buffer[self.pos + 0:self.pos + 4])
self.pos = self.pos + 4
self.print_header("Length #%d" % (i), str(length))
self.end_marker()
def read_PLM(self):
self.new_marker("PLM", "Packet length, main header")
if self.size < 3:
raise InvalidSizedMarker("PLM")
self.print_header("Index", str(ord(self.buffer[self.pos + 2])))
self.pos = self.pos + 3
self.size = self.size - 3
self.print_header("Length", str(self.size))
self.end_marker()
self.pos = self.pos + self.size
def read_PLT(self):
self.new_marker("PLT", "Packet length, tile-part header")
if self.size < 3:
raise InvalidSizedMarker("PLT")
self.print_header("Index Zplt", str(ord(self.buffer[self.pos + 2])))
self.print_header("Marker size Lplt", "%d bytes" % (self.size))
self.end_marker()
self.pos = self.pos + self.size
def read_CRG(self):
self.new_marker("CRG", "Component registration")
if self.size != self.csiz * 4 + 2:
raise InvalidSizedMarker("CRG")
self.pos = self.pos + 2
for i in range(self.csiz):
x = ordw(self.buffer[self.pos + 0:self.pos + 2])
y = ordw(self.buffer[self.pos + 2:self.pos + 4])
self.print_header("Offset #%d" % (i), "%dx%d" % (x, y))
self.pos = self.pos + 4
self.end_marker()
def read_CBD(self):
self.new_marker("CBD", "Component bit depth definition")
if self.size < 5:
raise InvalidSizedMarker("CBD")
nbcd = ordw(self.buffer[self.pos + 2:self.pos + 4])
if nbcd & (1 << 15):
nbcd -= 1 << 15
self.print_header("Definition style","Identical depth and signs")
count = 1
else:
self.print_header("Definition style","Individual depths and signs")
count = nbcd
self.print_header("Number of generated components",str(nbcd))
self.pos = self.pos + 4
for i in range(count):
if ord(self.buffer[self.pos]) & (1 << 7):
self.print_header("Component %d sign" % i,"signed")
else:
self.print_header("Component %d sign" % i,"unsigned")
self.print_header("Component %d Bit Depth" % i,str(1 + (ord(self.buffer[self.pos]) & 0x7f)))
self.pos += 1
self.end_marker()
def read_MCO(self):
self.new_marker("MCO", "Multiple component transform ordering")
if self.size < 3:
raise InvalidSizedMarker("MCO")
nmco = ord(self.buffer[self.pos + 2])
if self.size != nmco + 3:
raise InvalidSizedMarker("MCO")
self.print_header("Number of component collections","%d" % nmco)
self.pos += 3
for i in range(nmco):
self.print_header("MCC collection %d" % i,str(ord(self.buffer[self.pos])))
self.pos += 1
self.end_marker()
def read_MCC(self):
self.new_marker("MCC", "Multiple component collection")
if self.size < 5:
raise InvalidSizedMarker("MCC")
zmcc = ordw(self.buffer[self.pos + 2:self.pos + 4])
self.print_header("Concatenation index",str(zmcc))
imcc = ord(self.buffer[self.pos + 4])
self.print_header("Reference index",str(imcc))
self.pos += 5
if zmcc == 0:
ymcc = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.print_header("Last concatenation index",str(ymcc))
qmcc = ordw(self.buffer[self.pos + 2:self.pos + 4])
self.print_header("Number of collections",str(qmcc))
self.pos += 4
for i in range(qmcc):
ctp = ord(self.buffer[self.pos])
if ctp & 3 == 0:
s = "array based dependency transformation"
elif ctp & 3 == 1:
s = "array based decorrelation transformation"
elif ctp & 3 == 3:
s = "wavelet based transformation"
else:
s = "invalid type"
self.print_header("Transformation type",s)
self.pos += 1
nmcc = ordw(self.buffer[self.pos + 0:self.pos + 2])
if nmcc & (1 << 15):
self.print_header("Collection %d input index size" % i,"16 bit")
intype = 2
nmcc -= 1 << 15
else:
self.print_header("Collection %d input index size" % i,"8 bit")
intype = 1
self.print_header("Collection %d # of input components" % i,nmcc)
self.pos += 2
for j in range(nmcc):
if intype == 2:
incom = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.pos += 2
else:
incom = ord(self.buffer[self.pos])
self.pos += 1
self.print_header("Collection %d input component %d" % (i,j),str(incom))
mmcc = ordw(self.buffer[self.pos + 0:self.pos + 2])
if mmcc & (1 << 15):
self.print_header("Collection %d output index size" % i,"16 bit")
outtype = 2
mmcc -= 1 << 15
else:
self.print_header("Collection %d output index size" % i,"8 bit")
outtype = 1
self.print_header("Collection %d # of output components" % i,mmcc)
self.pos += 2
for j in range(mmcc):
if outtype == 2:
outcom = ordw(self.buffer[self.pos + 0:self.pos + 2])
self.pos += 2
else: