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118 lines
4.5 KiB
Python
118 lines
4.5 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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__all__ = ['Parser']
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import struct
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import logging
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from .exceptions import ParseError
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from . import core
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# http://www.pcisys.net/~melanson/codecs/rmff.htm
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# http://www.pcisys.net/~melanson/codecs/
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# get logging object
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log = logging.getLogger(__name__)
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class RealVideo(core.AVContainer):
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def __init__(self, file):
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core.AVContainer.__init__(self)
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self.mime = 'video/real'
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self.type = 'Real Video'
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h = file.read(10)
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try:
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(object_id, object_size, object_version) = struct.unpack('>4sIH', h)
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except struct.error:
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# EOF.
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raise ParseError()
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if not object_id == '.RMF':
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raise ParseError()
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file_version, num_headers = struct.unpack('>II', file.read(8))
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log.debug(u'size: %d, ver: %d, headers: %d' %
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(object_size, file_version, num_headers))
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for _ in range(0, num_headers):
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try:
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oi = struct.unpack('>4sIH', file.read(10))
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except (struct.error, IOError):
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# Header data we expected wasn't there. File may be
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# only partially complete.
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break
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if object_id == 'DATA' and oi[0] != 'INDX':
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log.debug(u'INDX chunk expected after DATA but not found -- file corrupt')
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break
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(object_id, object_size, object_version) = oi
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if object_id == 'DATA':
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# Seek over the data chunk rather than reading it in.
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file.seek(object_size - 10, 1)
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else:
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self._read_header(object_id, file.read(object_size - 10))
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log.debug(u'%r [%d]' % (object_id, object_size - 10))
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# Read all the following headers
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def _read_header(self, object_id, s):
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if object_id == 'PROP':
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prop = struct.unpack('>9IHH', s)
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log.debug(u'PROP: %r' % prop)
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if object_id == 'MDPR':
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mdpr = struct.unpack('>H7I', s[:30])
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log.debug(u'MDPR: %r' % mdpr)
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self.length = mdpr[7] / 1000.0
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(stream_name_size,) = struct.unpack('>B', s[30:31])
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# stream_name = s[31:31 + stream_name_size]
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pos = 31 + stream_name_size
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(mime_type_size,) = struct.unpack('>B', s[pos:pos + 1])
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mime = s[pos + 1:pos + 1 + mime_type_size]
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pos += mime_type_size + 1
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(type_specific_len,) = struct.unpack('>I', s[pos:pos + 4])
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# type_specific = s[pos + 4:pos + 4 + type_specific_len]
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pos += 4 + type_specific_len
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if mime[:5] == 'audio':
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ai = core.AudioStream()
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ai.id = mdpr[0]
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ai.bitrate = mdpr[2]
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self.audio.append(ai)
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elif mime[:5] == 'video':
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vi = core.VideoStream()
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vi.id = mdpr[0]
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vi.bitrate = mdpr[2]
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self.video.append(vi)
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else:
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log.debug(u'Unknown: %r' % mime)
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if object_id == 'CONT':
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pos = 0
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(title_len,) = struct.unpack('>H', s[pos:pos + 2])
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self.title = s[2:title_len + 2]
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pos += title_len + 2
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(author_len,) = struct.unpack('>H', s[pos:pos + 2])
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self.artist = s[pos + 2:pos + author_len + 2]
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pos += author_len + 2
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(copyright_len,) = struct.unpack('>H', s[pos:pos + 2])
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self.copyright = s[pos + 2:pos + copyright_len + 2]
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pos += copyright_len + 2
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(comment_len,) = struct.unpack('>H', s[pos:pos + 2])
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self.comment = s[pos + 2:pos + comment_len + 2]
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Parser = RealVideo
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