390 lines
15 KiB
Python
390 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# enzyme - Video metadata parser
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# Copyright 2011-2012 Antoine Bertin <diaoulael@gmail.com>
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# Copyright 2003-2006 Thomas Schueppel <stain@acm.org>
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# Copyright 2003-2006 Dirk Meyer <dischi@freevo.org>
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#
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# This file is part of enzyme.
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#
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# enzyme is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# enzyme is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with enzyme. If not, see <http://www.gnu.org/licenses/>.
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from exceptions import ParseError
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import core
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import logging
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import string
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import struct
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__all__ = ['Parser']
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# get logging object
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log = logging.getLogger(__name__)
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def _guid(input):
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# Remove any '-'
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s = string.join(string.split(input, '-'), '')
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r = ''
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if len(s) != 32:
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return ''
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for i in range(0, 16):
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r += chr(int(s[2 * i:2 * i + 2], 16))
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guid = struct.unpack('>IHHBB6s', r)
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return guid
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GUIDS = {
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'ASF_Header_Object' : _guid('75B22630-668E-11CF-A6D9-00AA0062CE6C'),
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'ASF_Data_Object' : _guid('75B22636-668E-11CF-A6D9-00AA0062CE6C'),
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'ASF_Simple_Index_Object' : _guid('33000890-E5B1-11CF-89F4-00A0C90349CB'),
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'ASF_Index_Object' : _guid('D6E229D3-35DA-11D1-9034-00A0C90349BE'),
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'ASF_Media_Object_Index_Object' : _guid('FEB103F8-12AD-4C64-840F-2A1D2F7AD48C'),
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'ASF_Timecode_Index_Object' : _guid('3CB73FD0-0C4A-4803-953D-EDF7B6228F0C'),
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'ASF_File_Properties_Object' : _guid('8CABDCA1-A947-11CF-8EE4-00C00C205365'),
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'ASF_Stream_Properties_Object' : _guid('B7DC0791-A9B7-11CF-8EE6-00C00C205365'),
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'ASF_Header_Extension_Object' : _guid('5FBF03B5-A92E-11CF-8EE3-00C00C205365'),
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'ASF_Codec_List_Object' : _guid('86D15240-311D-11D0-A3A4-00A0C90348F6'),
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'ASF_Script_Command_Object' : _guid('1EFB1A30-0B62-11D0-A39B-00A0C90348F6'),
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'ASF_Marker_Object' : _guid('F487CD01-A951-11CF-8EE6-00C00C205365'),
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'ASF_Bitrate_Mutual_Exclusion_Object' : _guid('D6E229DC-35DA-11D1-9034-00A0C90349BE'),
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'ASF_Error_Correction_Object' : _guid('75B22635-668E-11CF-A6D9-00AA0062CE6C'),
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'ASF_Content_Description_Object' : _guid('75B22633-668E-11CF-A6D9-00AA0062CE6C'),
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'ASF_Extended_Content_Description_Object' : _guid('D2D0A440-E307-11D2-97F0-00A0C95EA850'),
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'ASF_Content_Branding_Object' : _guid('2211B3FA-BD23-11D2-B4B7-00A0C955FC6E'),
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'ASF_Stream_Bitrate_Properties_Object' : _guid('7BF875CE-468D-11D1-8D82-006097C9A2B2'),
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'ASF_Content_Encryption_Object' : _guid('2211B3FB-BD23-11D2-B4B7-00A0C955FC6E'),
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'ASF_Extended_Content_Encryption_Object' : _guid('298AE614-2622-4C17-B935-DAE07EE9289C'),
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'ASF_Alt_Extended_Content_Encryption_Obj' : _guid('FF889EF1-ADEE-40DA-9E71-98704BB928CE'),
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'ASF_Digital_Signature_Object' : _guid('2211B3FC-BD23-11D2-B4B7-00A0C955FC6E'),
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'ASF_Padding_Object' : _guid('1806D474-CADF-4509-A4BA-9AABCB96AAE8'),
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'ASF_Extended_Stream_Properties_Object' : _guid('14E6A5CB-C672-4332-8399-A96952065B5A'),
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'ASF_Advanced_Mutual_Exclusion_Object' : _guid('A08649CF-4775-4670-8A16-6E35357566CD'),
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'ASF_Group_Mutual_Exclusion_Object' : _guid('D1465A40-5A79-4338-B71B-E36B8FD6C249'),
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'ASF_Stream_Prioritization_Object' : _guid('D4FED15B-88D3-454F-81F0-ED5C45999E24'),
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'ASF_Bandwidth_Sharing_Object' : _guid('A69609E6-517B-11D2-B6AF-00C04FD908E9'),
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'ASF_Language_List_Object' : _guid('7C4346A9-EFE0-4BFC-B229-393EDE415C85'),
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'ASF_Metadata_Object' : _guid('C5F8CBEA-5BAF-4877-8467-AA8C44FA4CCA'),
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'ASF_Metadata_Library_Object' : _guid('44231C94-9498-49D1-A141-1D134E457054'),
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'ASF_Index_Parameters_Object' : _guid('D6E229DF-35DA-11D1-9034-00A0C90349BE'),
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'ASF_Media_Object_Index_Parameters_Obj' : _guid('6B203BAD-3F11-4E84-ACA8-D7613DE2CFA7'),
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'ASF_Timecode_Index_Parameters_Object' : _guid('F55E496D-9797-4B5D-8C8B-604DFE9BFB24'),
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'ASF_Audio_Media' : _guid('F8699E40-5B4D-11CF-A8FD-00805F5C442B'),
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'ASF_Video_Media' : _guid('BC19EFC0-5B4D-11CF-A8FD-00805F5C442B'),
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'ASF_Command_Media' : _guid('59DACFC0-59E6-11D0-A3AC-00A0C90348F6'),
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'ASF_JFIF_Media' : _guid('B61BE100-5B4E-11CF-A8FD-00805F5C442B'),
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'ASF_Degradable_JPEG_Media' : _guid('35907DE0-E415-11CF-A917-00805F5C442B'),
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'ASF_File_Transfer_Media' : _guid('91BD222C-F21C-497A-8B6D-5AA86BFC0185'),
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'ASF_Binary_Media' : _guid('3AFB65E2-47EF-40F2-AC2C-70A90D71D343'),
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'ASF_Web_Stream_Media_Subtype' : _guid('776257D4-C627-41CB-8F81-7AC7FF1C40CC'),
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'ASF_Web_Stream_Format' : _guid('DA1E6B13-8359-4050-B398-388E965BF00C'),
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'ASF_No_Error_Correction' : _guid('20FB5700-5B55-11CF-A8FD-00805F5C442B'),
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'ASF_Audio_Spread' : _guid('BFC3CD50-618F-11CF-8BB2-00AA00B4E220')}
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class Asf(core.AVContainer):
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"""
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ASF video parser. The ASF format is also used for Microsft Windows
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Media files like wmv.
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"""
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def __init__(self, file):
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core.AVContainer.__init__(self)
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self.mime = 'video/x-ms-asf'
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self.type = 'asf format'
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self._languages = []
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self._extinfo = {}
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h = file.read(30)
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if len(h) < 30:
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raise ParseError()
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(guidstr, objsize, objnum, reserved1, \
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reserved2) = struct.unpack('<16sQIBB', h)
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guid = self._parseguid(guidstr)
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if (guid != GUIDS['ASF_Header_Object']):
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raise ParseError()
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if reserved1 != 0x01 or reserved2 != 0x02:
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raise ParseError()
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log.debug(u'Header size: %d / %d objects' % (objsize, objnum))
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header = file.read(objsize - 30)
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for _ in range(0, objnum):
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h = self._getnextheader(header)
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header = header[h[1]:]
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del self._languages
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del self._extinfo
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def _findstream(self, id):
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for stream in self.video + self.audio:
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if stream.id == id:
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return stream
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def _apply_extinfo(self, streamid):
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stream = self._findstream(streamid)
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if not stream or streamid not in self._extinfo:
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return
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stream.bitrate, stream.fps, langid, metadata = self._extinfo[streamid]
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if langid is not None and langid >= 0 and langid < len(self._languages):
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stream.language = self._languages[langid]
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if metadata:
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stream._appendtable('ASFMETADATA', metadata)
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def _parseguid(self, string):
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return struct.unpack('<IHHBB6s', string[:16])
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def _parsekv(self, s):
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pos = 0
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(descriptorlen,) = struct.unpack('<H', s[pos:pos + 2])
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pos += 2
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descriptorname = s[pos:pos + descriptorlen]
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pos += descriptorlen
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descriptortype, valuelen = struct.unpack('<HH', s[pos:pos + 4])
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pos += 4
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descriptorvalue = s[pos:pos + valuelen]
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pos += valuelen
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value = None
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if descriptortype == 0x0000:
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# Unicode string
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value = descriptorvalue
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elif descriptortype == 0x0001:
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# Byte Array
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value = descriptorvalue
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elif descriptortype == 0x0002:
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# Bool (?)
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value = struct.unpack('<I', descriptorvalue)[0] != 0
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elif descriptortype == 0x0003:
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# DWORD
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value = struct.unpack('<I', descriptorvalue)[0]
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elif descriptortype == 0x0004:
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# QWORD
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value = struct.unpack('<Q', descriptorvalue)[0]
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elif descriptortype == 0x0005:
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# WORD
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value = struct.unpack('<H', descriptorvalue)[0]
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else:
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log.debug(u'Unknown Descriptor Type %d' % descriptortype)
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return (pos, descriptorname, value)
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def _parsekv2(self, s):
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pos = 0
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strno, descriptorlen, descriptortype, valuelen = struct.unpack('<2xHHHI', s[pos:pos + 12])
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pos += 12
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descriptorname = s[pos:pos + descriptorlen]
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pos += descriptorlen
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descriptorvalue = s[pos:pos + valuelen]
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pos += valuelen
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value = None
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if descriptortype == 0x0000:
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# Unicode string
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value = descriptorvalue
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elif descriptortype == 0x0001:
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# Byte Array
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value = descriptorvalue
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elif descriptortype == 0x0002:
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# Bool
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value = struct.unpack('<H', descriptorvalue)[0] != 0
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pass
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elif descriptortype == 0x0003:
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# DWORD
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value = struct.unpack('<I', descriptorvalue)[0]
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elif descriptortype == 0x0004:
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# QWORD
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value = struct.unpack('<Q', descriptorvalue)[0]
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elif descriptortype == 0x0005:
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# WORD
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value = struct.unpack('<H', descriptorvalue)[0]
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else:
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log.debug(u'Unknown Descriptor Type %d' % descriptortype)
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return (pos, descriptorname, value, strno)
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def _getnextheader(self, s):
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r = struct.unpack('<16sQ', s[:24])
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(guidstr, objsize) = r
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guid = self._parseguid(guidstr)
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if guid == GUIDS['ASF_File_Properties_Object']:
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log.debug(u'File Properties Object')
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val = struct.unpack('<16s6Q4I', s[24:24 + 80])
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(fileid, size, date, packetcount, duration, \
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senddur, preroll, flags, minpack, maxpack, maxbr) = \
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val
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# FIXME: parse date to timestamp
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self.length = duration / 10000000.0
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elif guid == GUIDS['ASF_Stream_Properties_Object']:
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log.debug(u'Stream Properties Object [%d]' % objsize)
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streamtype = self._parseguid(s[24:40])
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errortype = self._parseguid(s[40:56])
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offset, typelen, errorlen, flags = struct.unpack('<QIIH', s[56:74])
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strno = flags & 0x7f
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encrypted = flags >> 15
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if encrypted:
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self._set('encrypted', True)
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if streamtype == GUIDS['ASF_Video_Media']:
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vi = core.VideoStream()
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vi.width, vi.height, depth, codec, = struct.unpack('<4xII2xH4s', s[89:89 + 20])
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vi.codec = codec
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vi.id = strno
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self.video.append(vi)
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elif streamtype == GUIDS['ASF_Audio_Media']:
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ai = core.AudioStream()
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twocc, ai.channels, ai.samplerate, bitrate, block, \
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ai.samplebits, = struct.unpack('<HHIIHH', s[78:78 + 16])
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ai.bitrate = 8 * bitrate
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ai.codec = twocc
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ai.id = strno
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self.audio.append(ai)
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self._apply_extinfo(strno)
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elif guid == GUIDS['ASF_Extended_Stream_Properties_Object']:
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streamid, langid, frametime = struct.unpack('<HHQ', s[72:84])
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(bitrate,) = struct.unpack('<I', s[40:40 + 4])
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if streamid not in self._extinfo:
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self._extinfo[streamid] = [None, None, None, {}]
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if frametime == 0:
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# Problaby VFR, report as 1000fps (which is what MPlayer does)
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frametime = 10000.0
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self._extinfo[streamid][:3] = [bitrate, 10000000.0 / frametime, langid]
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self._apply_extinfo(streamid)
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elif guid == GUIDS['ASF_Header_Extension_Object']:
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log.debug(u'ASF_Header_Extension_Object %d' % objsize)
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size = struct.unpack('<I', s[42:46])[0]
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data = s[46:46 + size]
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while len(data):
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log.debug(u'Sub:')
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h = self._getnextheader(data)
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data = data[h[1]:]
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elif guid == GUIDS['ASF_Codec_List_Object']:
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log.debug(u'List Object')
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pass
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elif guid == GUIDS['ASF_Error_Correction_Object']:
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log.debug(u'Error Correction')
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pass
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elif guid == GUIDS['ASF_Content_Description_Object']:
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log.debug(u'Content Description Object')
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val = struct.unpack('<5H', s[24:24 + 10])
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pos = 34
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strings = []
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for i in val:
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ss = s[pos:pos + i].replace('\0', '').lstrip().rstrip()
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strings.append(ss)
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pos += i
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# Set empty strings to None
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strings = [x or None for x in strings]
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self.title, self.artist, self.copyright, self.caption, rating = strings
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elif guid == GUIDS['ASF_Extended_Content_Description_Object']:
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(count,) = struct.unpack('<H', s[24:26])
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pos = 26
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descriptor = {}
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for i in range(0, count):
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# Read additional content descriptors
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d = self._parsekv(s[pos:])
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pos += d[0]
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descriptor[d[1]] = d[2]
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self._appendtable('ASFDESCRIPTOR', descriptor)
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elif guid == GUIDS['ASF_Metadata_Object']:
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(count,) = struct.unpack('<H', s[24:26])
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pos = 26
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streams = {}
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for i in range(0, count):
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# Read additional content descriptors
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size, key, value, strno = self._parsekv2(s[pos:])
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if strno not in streams:
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streams[strno] = {}
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streams[strno][key] = value
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pos += size
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for strno, metadata in streams.items():
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if strno not in self._extinfo:
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self._extinfo[strno] = [None, None, None, {}]
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self._extinfo[strno][3].update(metadata)
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self._apply_extinfo(strno)
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elif guid == GUIDS['ASF_Language_List_Object']:
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count = struct.unpack('<H', s[24:26])[0]
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pos = 26
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for i in range(0, count):
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idlen = struct.unpack('<B', s[pos:pos + 1])[0]
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idstring = s[pos + 1:pos + 1 + idlen]
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idstring = unicode(idstring, 'utf-16').replace('\0', '')
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log.debug(u'Language: %d/%d: %r' % (i + 1, count, idstring))
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self._languages.append(idstring)
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pos += 1 + idlen
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elif guid == GUIDS['ASF_Stream_Bitrate_Properties_Object']:
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# This record contains stream bitrate with payload overhead. For
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# audio streams, we should have the average bitrate from
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# ASF_Stream_Properties_Object. For video streams, we get it from
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# ASF_Extended_Stream_Properties_Object. So this record is not
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# used.
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pass
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elif guid == GUIDS['ASF_Content_Encryption_Object'] or \
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guid == GUIDS['ASF_Extended_Content_Encryption_Object']:
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self._set('encrypted', True)
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else:
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# Just print the type:
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for h in GUIDS.keys():
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if GUIDS[h] == guid:
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log.debug(u'Unparsed %r [%d]' % (h, objsize))
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break
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else:
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u = "%.8X-%.4X-%.4X-%.2X%.2X-%s" % guid
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log.debug(u'unknown: len=%d [%d]' % (len(u), objsize))
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return r
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class AsfAudio(core.AudioStream):
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"""
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ASF audio parser for wma files.
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"""
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def __init__(self):
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core.AudioStream.__init__(self)
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self.mime = 'audio/x-ms-asf'
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self.type = 'asf format'
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def Parser(file):
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"""
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Wrapper around audio and av content.
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"""
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asf = Asf(file)
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if not len(asf.audio) or len(asf.video):
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# AV container
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return asf
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# No video but audio streams. Handle has audio core
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audio = AsfAudio()
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for key in audio._keys:
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if key in asf._keys:
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if not getattr(audio, key, None):
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setattr(audio, key, getattr(asf, key))
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return audio
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