/usr/share/pyshared/kaa/metadata/video/asf.py is in python-kaa-metadata 0.7.7+svn4596-4.
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# -----------------------------------------------------------------------------
# asf.py - asf file parser
# -----------------------------------------------------------------------------
# $Id: asf.py 3996 2009-05-16 14:12:36Z tack $
#
# See http://download.microsoft.com/download/e/0/6/e06db390-1e2a-4978-\
# 82bb-311810d8a28d/ASF_Specification.doc
#
# -----------------------------------------------------------------------------
# kaa-Metadata - Media Metadata for Python
# Copyright (C) 2003-2006 Thomas Schueppel, Dirk Meyer
#
# First Edition: Thomas Schueppel <stain@acm.org>
# Maintainer: Dirk Meyer <dischi@freevo.org>
#
# Please see the file AUTHORS for a complete list of authors.
#
# 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
#
# -----------------------------------------------------------------------------
__all__ = ['Parser']
# python imports
import struct
import string
import logging
# import kaa.metadata.video core
import core
# import kaa.metadata.audio for asf files without video stream
import kaa.metadata.audio.core as audiocore
# get logging object
log = logging.getLogger('metadata')
def _guid(input):
# Remove any '-'
s = string.join(string.split(input,'-'), '')
r = ''
if len(s) != 32:
return ''
x = ''
for i in range(0,16):
r+=chr(int(s[2*i:2*i+2],16))
guid = struct.unpack('>IHHBB6s',r)
return guid
GUIDS = {
'ASF_Header_Object' : _guid('75B22630-668E-11CF-A6D9-00AA0062CE6C'),
'ASF_Data_Object' : _guid('75B22636-668E-11CF-A6D9-00AA0062CE6C'),
'ASF_Simple_Index_Object' : _guid('33000890-E5B1-11CF-89F4-00A0C90349CB'),
'ASF_Index_Object' : _guid('D6E229D3-35DA-11D1-9034-00A0C90349BE'),
'ASF_Media_Object_Index_Object' : _guid('FEB103F8-12AD-4C64-840F-2A1D2F7AD48C'),
'ASF_Timecode_Index_Object' : _guid('3CB73FD0-0C4A-4803-953D-EDF7B6228F0C'),
'ASF_File_Properties_Object' : _guid('8CABDCA1-A947-11CF-8EE4-00C00C205365'),
'ASF_Stream_Properties_Object' : _guid('B7DC0791-A9B7-11CF-8EE6-00C00C205365'),
'ASF_Header_Extension_Object' : _guid('5FBF03B5-A92E-11CF-8EE3-00C00C205365'),
'ASF_Codec_List_Object' : _guid('86D15240-311D-11D0-A3A4-00A0C90348F6'),
'ASF_Script_Command_Object' : _guid('1EFB1A30-0B62-11D0-A39B-00A0C90348F6'),
'ASF_Marker_Object' : _guid('F487CD01-A951-11CF-8EE6-00C00C205365'),
'ASF_Bitrate_Mutual_Exclusion_Object' : _guid('D6E229DC-35DA-11D1-9034-00A0C90349BE'),
'ASF_Error_Correction_Object' : _guid('75B22635-668E-11CF-A6D9-00AA0062CE6C'),
'ASF_Content_Description_Object' : _guid('75B22633-668E-11CF-A6D9-00AA0062CE6C'),
'ASF_Extended_Content_Description_Object' : _guid('D2D0A440-E307-11D2-97F0-00A0C95EA850'),
'ASF_Content_Branding_Object' : _guid('2211B3FA-BD23-11D2-B4B7-00A0C955FC6E'),
'ASF_Stream_Bitrate_Properties_Object' : _guid('7BF875CE-468D-11D1-8D82-006097C9A2B2'),
'ASF_Content_Encryption_Object' : _guid('2211B3FB-BD23-11D2-B4B7-00A0C955FC6E'),
'ASF_Extended_Content_Encryption_Object' : _guid('298AE614-2622-4C17-B935-DAE07EE9289C'),
'ASF_Alt_Extended_Content_Encryption_Obj' : _guid('FF889EF1-ADEE-40DA-9E71-98704BB928CE'),
'ASF_Digital_Signature_Object' : _guid('2211B3FC-BD23-11D2-B4B7-00A0C955FC6E'),
'ASF_Padding_Object' : _guid('1806D474-CADF-4509-A4BA-9AABCB96AAE8'),
'ASF_Extended_Stream_Properties_Object' : _guid('14E6A5CB-C672-4332-8399-A96952065B5A'),
'ASF_Advanced_Mutual_Exclusion_Object' : _guid('A08649CF-4775-4670-8A16-6E35357566CD'),
'ASF_Group_Mutual_Exclusion_Object' : _guid('D1465A40-5A79-4338-B71B-E36B8FD6C249'),
'ASF_Stream_Prioritization_Object' : _guid('D4FED15B-88D3-454F-81F0-ED5C45999E24'),
'ASF_Bandwidth_Sharing_Object' : _guid('A69609E6-517B-11D2-B6AF-00C04FD908E9'),
'ASF_Language_List_Object' : _guid('7C4346A9-EFE0-4BFC-B229-393EDE415C85'),
'ASF_Metadata_Object' : _guid('C5F8CBEA-5BAF-4877-8467-AA8C44FA4CCA'),
'ASF_Metadata_Library_Object' : _guid('44231C94-9498-49D1-A141-1D134E457054'),
'ASF_Index_Parameters_Object' : _guid('D6E229DF-35DA-11D1-9034-00A0C90349BE'),
'ASF_Media_Object_Index_Parameters_Obj' : _guid('6B203BAD-3F11-4E84-ACA8-D7613DE2CFA7'),
'ASF_Timecode_Index_Parameters_Object' : _guid('F55E496D-9797-4B5D-8C8B-604DFE9BFB24'),
'ASF_Audio_Media' : _guid('F8699E40-5B4D-11CF-A8FD-00805F5C442B'),
'ASF_Video_Media' : _guid('BC19EFC0-5B4D-11CF-A8FD-00805F5C442B'),
'ASF_Command_Media' : _guid('59DACFC0-59E6-11D0-A3AC-00A0C90348F6'),
'ASF_JFIF_Media' : _guid('B61BE100-5B4E-11CF-A8FD-00805F5C442B'),
'ASF_Degradable_JPEG_Media' : _guid('35907DE0-E415-11CF-A917-00805F5C442B'),
'ASF_File_Transfer_Media' : _guid('91BD222C-F21C-497A-8B6D-5AA86BFC0185'),
'ASF_Binary_Media' : _guid('3AFB65E2-47EF-40F2-AC2C-70A90D71D343'),
'ASF_Web_Stream_Media_Subtype' : _guid('776257D4-C627-41CB-8F81-7AC7FF1C40CC'),
'ASF_Web_Stream_Format' : _guid('DA1E6B13-8359-4050-B398-388E965BF00C'),
'ASF_No_Error_Correction' : _guid('20FB5700-5B55-11CF-A8FD-00805F5C442B'),
'ASF_Audio_Spread' : _guid('BFC3CD50-618F-11CF-8BB2-00AA00B4E220'),
}
class Asf(core.AVContainer):
"""
ASF video parser. The ASF format is also used for Microsft Windows
Media files like wmv.
"""
def __init__(self, file):
core.AVContainer.__init__(self)
self.mime = 'video/x-ms-asf'
self.type = 'asf format'
self._languages = []
self._extinfo = {}
h = file.read(30)
if len(h) < 30:
raise core.ParseError()
(guidstr, objsize, objnum, reserved1, \
reserved2) = struct.unpack('<16sQIBB',h)
guid = self._parseguid(guidstr)
if (guid != GUIDS['ASF_Header_Object']):
raise core.ParseError()
if reserved1 != 0x01 or reserved2 != 0x02:
raise core.ParseError()
log.debug("asf header size: %d / %d objects" % (objsize,objnum))
header = file.read(objsize-30)
for i in range(0,objnum):
h = self._getnextheader(header)
header = header[h[1]:]
del self._languages
del self._extinfo
def _findstream(self, id):
for stream in self.video + self.audio:
if stream.id == id:
return stream
def _apply_extinfo(self, streamid):
stream = self._findstream(streamid)
if not stream or streamid not in self._extinfo:
return
stream.bitrate, stream.fps, langid, metadata = self._extinfo[streamid]
if langid is not None and langid >= 0 and langid < len(self._languages):
stream.language = self._languages[langid]
if metadata:
stream._appendtable('ASFMETADATA', metadata)
def _parseguid(self,string):
return struct.unpack('<IHHBB6s', string[:16])
def _parsekv(self,s):
pos = 0
(descriptorlen,) = struct.unpack('<H', s[pos:pos+2])
pos += 2
descriptorname = s[pos:pos+descriptorlen]
pos += descriptorlen
descriptortype, valuelen = struct.unpack('<HH', s[pos:pos+4])
pos += 4
descriptorvalue = s[pos:pos+valuelen]
pos += valuelen
value = None
if descriptortype == 0x0000:
# Unicode string
value = descriptorvalue
elif descriptortype == 0x0001:
# Byte Array
value = descriptorvalue
elif descriptortype == 0x0002:
# Bool (?)
value = struct.unpack('<I', descriptorvalue)[0] != 0
elif descriptortype == 0x0003:
# DWORD
value = struct.unpack('<I', descriptorvalue)[0]
elif descriptortype == 0x0004:
# QWORD
value = struct.unpack('<Q', descriptorvalue)[0]
elif descriptortype == 0x0005:
# WORD
value = struct.unpack('<H', descriptorvalue)[0]
else:
log.debug("Unknown Descriptor Type %d" % descriptortype)
return (pos,descriptorname,value)
def _parsekv2(self,s):
pos = 0
strno, descriptorlen, descriptortype, valuelen = struct.unpack('<2xHHHI', s[pos:pos+12])
pos += 12
descriptorname = s[pos:pos+descriptorlen]
pos += descriptorlen
descriptorvalue = s[pos:pos+valuelen]
pos += valuelen
value = None
if descriptortype == 0x0000:
# Unicode string
value = descriptorvalue
elif descriptortype == 0x0001:
# Byte Array
value = descriptorvalue
elif descriptortype == 0x0002:
# Bool
value = struct.unpack('<H', descriptorvalue)[0] != 0
pass
elif descriptortype == 0x0003:
# DWORD
value = struct.unpack('<I', descriptorvalue)[0]
elif descriptortype == 0x0004:
# QWORD
value = struct.unpack('<Q', descriptorvalue)[0]
elif descriptortype == 0x0005:
# WORD
value = struct.unpack('<H', descriptorvalue)[0]
else:
log.debug("Unknown Descriptor Type %d" % descriptortype)
return (pos,descriptorname,value,strno)
def _getnextheader(self,s):
r = struct.unpack('<16sQ',s[:24])
(guidstr,objsize) = r
guid = self._parseguid(guidstr)
if guid == GUIDS['ASF_File_Properties_Object']:
log.debug("File Properties Object")
val = struct.unpack('<16s6Q4I',s[24:24+80])
(fileid, size, date, packetcount, duration, \
senddur, preroll, flags, minpack, maxpack, maxbr) = \
val
# FIXME: parse date to timestamp
self.length = duration/10000000.0
elif guid == GUIDS['ASF_Stream_Properties_Object']:
log.debug("Stream Properties Object [%d]" % objsize)
streamtype = self._parseguid(s[24:40])
errortype = self._parseguid(s[40:56])
offset, typelen, errorlen, flags = struct.unpack('<QIIH', s[56:74])
strno = flags & 0x7f
encrypted = flags >> 15
if encrypted:
self._set('encrypted', True)
if streamtype == GUIDS['ASF_Video_Media']:
vi = core.VideoStream()
vi.width, vi.height, depth, codec, = struct.unpack('<4xII2xH4s', s[89:89+20])
vi.codec = codec
vi.id = strno
self.video.append(vi)
elif streamtype == GUIDS['ASF_Audio_Media']:
ai = core.AudioStream()
twocc, ai.channels, ai.samplerate, bitrate, block, \
ai.samplebits, = struct.unpack('<HHIIHH', s[78:78+16])
ai.bitrate = 8*bitrate
ai.codec = twocc
ai.id = strno
self.audio.append(ai)
self._apply_extinfo(strno)
elif guid == GUIDS['ASF_Extended_Stream_Properties_Object']:
streamid, langid, frametime = struct.unpack('<HHQ',s[72:84])
(bitrate,) = struct.unpack('<I', s[40:40+4])
if streamid not in self._extinfo:
self._extinfo[streamid] = [None, None, None, {}]
if frametime == 0:
# Problaby VFR, report as 1000fps (which is what MPlayer does)
frametime = 10000.0
self._extinfo[streamid][:3] = [bitrate, 10000000.0 / frametime, langid]
self._apply_extinfo(streamid)
elif guid == GUIDS['ASF_Header_Extension_Object']:
log.debug("ASF_Header_Extension_Object %d" % objsize)
size = struct.unpack('<I',s[42:46])[0]
data = s[46:46+size]
while len(data):
log.debug("Sub:")
h = self._getnextheader(data)
data = data[h[1]:]
elif guid == GUIDS['ASF_Codec_List_Object']:
log.debug("List Object")
pass
elif guid == GUIDS['ASF_Error_Correction_Object']:
log.debug("Error Correction")
pass
elif guid == GUIDS['ASF_Content_Description_Object']:
log.debug("Content Description Object")
val = struct.unpack('<5H', s[24:24+10])
pos = 34
strings = []
for i in val:
ss = s[pos:pos+i].replace('\0', '').lstrip().rstrip()
strings.append(ss)
pos+=i
# Set empty strings to None
strings = [ x or None for x in strings ]
self.title, self.artist, self.copyright, self.caption, rating = strings
elif guid == GUIDS['ASF_Extended_Content_Description_Object']:
(count,) = struct.unpack('<H', s[24:26])
pos = 26
descriptor = {}
for i in range(0, count):
# Read additional content descriptors
d = self._parsekv(s[pos:])
pos += d[0]
descriptor[d[1]] = d[2]
self._appendtable('ASFDESCRIPTOR', descriptor)
elif guid == GUIDS['ASF_Metadata_Object']:
(count,) = struct.unpack('<H', s[24:26])
pos = 26
streams = {}
for i in range(0, count):
# Read additional content descriptors
size,key,value,strno = self._parsekv2(s[pos:])
if strno not in streams:
streams[strno] = {}
streams[strno][key] = value
pos += size
for strno, metadata in streams.items():
if strno not in self._extinfo:
self._extinfo[strno] = [None, None, None, {}]
self._extinfo[strno][3].update(metadata)
self._apply_extinfo(strno)
elif guid == GUIDS['ASF_Language_List_Object']:
count = struct.unpack('<H', s[24:26])[0]
pos = 26
for i in range(0, count):
idlen = struct.unpack('<B', s[pos:pos+1])[0]
idstring = s[pos+1:pos+1+idlen]
idstring = unicode(idstring, 'utf-16').replace('\0', '')
log.debug("Language: %d/%d: %s" % (i+1, count, idstring))
self._languages.append(idstring)
pos += 1+idlen
elif guid == GUIDS['ASF_Stream_Bitrate_Properties_Object']:
# This record contains stream bitrate with payload overhead. For
# audio streams, we should have the average bitrate from
# ASF_Stream_Properties_Object. For video streams, we get it from
# ASF_Extended_Stream_Properties_Object. So this record is not
# used.
pass
elif guid == GUIDS['ASF_Content_Encryption_Object'] or \
guid == GUIDS['ASF_Extended_Content_Encryption_Object']:
self._set('encrypted', True)
else:
# Just print the type:
for h in GUIDS.keys():
if GUIDS[h] == guid:
log.debug("Unparsed %s [%d]" % (h,objsize))
break
else:
u = "%.8X-%.4X-%.4X-%.2X%.2X-%s" % guid
log.debug("unknown: len=%d [%d]" % (len(u), objsize))
return r
class AsfAudio(audiocore.Audio):
"""
ASF audio parser for wma files.
"""
def __init__(self):
audiocore.Audio.__init__(self)
self.mime = 'audio/x-ms-asf'
self.type = 'asf format'
def Parser(file):
"""
Wrapper around audio and av content.
"""
asf = Asf(file)
if not len(asf.audio) or len(asf.video):
# AV container
return asf
# No video but audio streams. Handle has audio core
audio = AsfAudio()
for key in audio._keys:
if key in asf._keys:
if not getattr(audio, key, None):
setattr(audio, key, getattr(asf, key))
return audio
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