#if 0
# -----------------------------------------------------------------------
# $Id: pnginfo.py 408 2005-04-16 17:09:12Z dischi $
# -----------------------------------------------------------------------
# $Log$
# Revision 1.11 2005/04/16 17:09:12 dischi
# add thumbnail data to internal vars
#
# Revision 1.10 2004/05/20 15:56:31 dischi
# use Python Imaging for more info and gif/bmp support
#
# Revision 1.9 2003/06/30 13:17:20 the_krow
# o Refactored mediainfo into factory, synchronizedobject
# o Parsers now register directly at mmpython not at mmpython.mediainfo
# o use mmpython.Factory() instead of mmpython.mediainfo.get_singleton()
# o Bugfix in PNG parser
# o Renamed disc.AudioInfo into disc.AudioDiscInfo
# o Renamed disc.DataInfo into disc.DataDiscInfo
#
# Revision 1.8 2003/06/23 20:59:11 the_krow
# PNG should now fill a correct table.
#
# Revision 1.7 2003/06/20 19:17:22 dischi
# remove filename again and use file.name
#
# Revision 1.6 2003/06/08 20:27:42 dischi
# small fix for broken files and fixed a wrong bins_data call
#
# Revision 1.5 2003/06/08 19:55:22 dischi
# added bins metadata support
#
# Revision 1.4 2003/06/08 13:44:58 dischi
# Changed all imports to use the complete mmpython path for mediainfo
#
# Revision 1.3 2003/06/08 13:11:51 dischi
# removed print at the end and moved it into register
#
# Revision 1.2 2003/05/13 15:00:23 the_krow
# Tiff parsing
#
# Revision 1.1 2003/05/13 12:31:11 the_krow
# + GNU Copyright Notice
# + PNG Parsing
#
# -----------------------------------------------------------------------
# MMPython - Media Metadata for Python
# Copyright (C) 2003 Thomas Schueppel
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MER-
# CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# -----------------------------------------------------------------------
#endif
from mmpython import mediainfo
import mmpython
import IPTC
import EXIF
import struct
import zlib
import ImageInfo
# interesting file format info:
# http://www.libpng.org/pub/png/png-sitemap.html#programming
# http://pmt.sourceforge.net/pngmeta/
PNGSIGNATURE = "\211PNG\r\n\032\n"
_print = mediainfo._debug
class PNGInfo(mediainfo.ImageInfo):
def __init__(self,file):
mediainfo.ImageInfo.__init__(self)
self.iptc = None
self.mime = 'image/png'
self.type = 'PNG image'
self.valid = 1
signature = file.read(8)
if ( signature != PNGSIGNATURE ):
self.valid = 0
return
self.meta = {}
while self._readChunk(file):
pass
if len(self.meta.keys()):
self.appendtable( 'PNGMETA', self.meta )
for key, value in self.meta.items():
if key.startswith('Thumb:') or key == 'Software':
setattr(self, key, value)
if not key in self.keys:
self.keys.append(key)
ImageInfo.add(file.name, self)
return
def _readChunk(self,file):
try:
(length, type) = struct.unpack('>I4s', file.read(8))
except:
return 0
if ( type == 'tEXt' ):
_print('latin-1 Text found.')
(data, crc) = struct.unpack('>%isI' % length,file.read(length+4))
(key, value) = data.split('\0')
self.meta[key] = value
_print("%s -> %s" % (key,value))
elif ( type == 'zTXt' ):
_print('Compressed Text found.')
(data,crc) = struct.unpack('>%isI' % length,file.read(length+4))
split = data.split('\0')
key = split[0]
value = "".join(split[1:])
compression = ord(value[0])
value = value[1:]
if compression == 0:
decompressed = zlib.decompress(value)
_print("%s (Compressed %i) -> %s" % (key,compression,decompressed))
else:
_print("%s has unknown Compression %c" % (key,compression))
self.meta[key] = value
elif ( type == 'iTXt' ):
_print('International Text found.')
(data,crc) = struct.unpack('>%isI' % length,file.read(length+4))
(key, value) = data.split('\0')
self.meta[key] = value
_print("%s -> %s" % (key,value))
else:
file.seek(length+4,1)
_print("%s of length %d ignored." % (type, length))
return 1
mmpython.registertype( 'image/png', ('png',), mediainfo.TYPE_IMAGE, PNGInfo )
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