119 lines
4.4 KiB
Python
119 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
|
|
# enzyme - Video metadata parser
|
|
# Copyright 2011-2012 Antoine Bertin <diaoulael@gmail.com>
|
|
# Copyright 2003-2006 Thomas Schueppel <stain@acm.org>
|
|
# Copyright 2003-2006 Dirk Meyer <dischi@freevo.org>
|
|
#
|
|
# This file is part of enzyme.
|
|
#
|
|
# enzyme 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 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# enzyme is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY 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 enzyme. If not, see <http://www.gnu.org/licenses/>.
|
|
__all__ = ['Parser']
|
|
|
|
import struct
|
|
import logging
|
|
from exceptions import ParseError
|
|
import core
|
|
|
|
# http://www.pcisys.net/~melanson/codecs/rmff.htm
|
|
# http://www.pcisys.net/~melanson/codecs/
|
|
|
|
# get logging object
|
|
log = logging.getLogger(__name__)
|
|
|
|
class RealVideo(core.AVContainer):
|
|
def __init__(self, file):
|
|
core.AVContainer.__init__(self)
|
|
self.mime = 'video/real'
|
|
self.type = 'Real Video'
|
|
h = file.read(10)
|
|
try:
|
|
(object_id, object_size, object_version) = struct.unpack('>4sIH', h)
|
|
except struct.error:
|
|
# EOF.
|
|
raise ParseError()
|
|
|
|
if not object_id == '.RMF':
|
|
raise ParseError()
|
|
|
|
file_version, num_headers = struct.unpack('>II', file.read(8))
|
|
log.debug(u'size: %d, ver: %d, headers: %d' % \
|
|
(object_size, file_version, num_headers))
|
|
for _ in range(0, num_headers):
|
|
try:
|
|
oi = struct.unpack('>4sIH', file.read(10))
|
|
except (struct.error, IOError):
|
|
# Header data we expected wasn't there. File may be
|
|
# only partially complete.
|
|
break
|
|
|
|
if object_id == 'DATA' and oi[0] != 'INDX':
|
|
log.debug(u'INDX chunk expected after DATA but not found -- file corrupt')
|
|
break
|
|
|
|
(object_id, object_size, object_version) = oi
|
|
if object_id == 'DATA':
|
|
# Seek over the data chunk rather than reading it in.
|
|
file.seek(object_size - 10, 1)
|
|
else:
|
|
self._read_header(object_id, file.read(object_size - 10))
|
|
log.debug(u'%r [%d]' % (object_id, object_size - 10))
|
|
# Read all the following headers
|
|
|
|
|
|
def _read_header(self, object_id, s):
|
|
if object_id == 'PROP':
|
|
prop = struct.unpack('>9IHH', s)
|
|
log.debug(u'PROP: %r' % prop)
|
|
if object_id == 'MDPR':
|
|
mdpr = struct.unpack('>H7I', s[:30])
|
|
log.debug(u'MDPR: %r' % mdpr)
|
|
self.length = mdpr[7] / 1000.0
|
|
(stream_name_size,) = struct.unpack('>B', s[30:31])
|
|
stream_name = s[31:31 + stream_name_size]
|
|
pos = 31 + stream_name_size
|
|
(mime_type_size,) = struct.unpack('>B', s[pos:pos + 1])
|
|
mime = s[pos + 1:pos + 1 + mime_type_size]
|
|
pos += mime_type_size + 1
|
|
(type_specific_len,) = struct.unpack('>I', s[pos:pos + 4])
|
|
type_specific = s[pos + 4:pos + 4 + type_specific_len]
|
|
pos += 4 + type_specific_len
|
|
if mime[:5] == 'audio':
|
|
ai = core.AudioStream()
|
|
ai.id = mdpr[0]
|
|
ai.bitrate = mdpr[2]
|
|
self.audio.append(ai)
|
|
elif mime[:5] == 'video':
|
|
vi = core.VideoStream()
|
|
vi.id = mdpr[0]
|
|
vi.bitrate = mdpr[2]
|
|
self.video.append(vi)
|
|
else:
|
|
log.debug(u'Unknown: %r' % mime)
|
|
if object_id == 'CONT':
|
|
pos = 0
|
|
(title_len,) = struct.unpack('>H', s[pos:pos + 2])
|
|
self.title = s[2:title_len + 2]
|
|
pos += title_len + 2
|
|
(author_len,) = struct.unpack('>H', s[pos:pos + 2])
|
|
self.artist = s[pos + 2:pos + author_len + 2]
|
|
pos += author_len + 2
|
|
(copyright_len,) = struct.unpack('>H', s[pos:pos + 2])
|
|
self.copyright = s[pos + 2:pos + copyright_len + 2]
|
|
pos += copyright_len + 2
|
|
(comment_len,) = struct.unpack('>H', s[pos:pos + 2])
|
|
self.comment = s[pos + 2:pos + comment_len + 2]
|
|
|
|
|
|
Parser = RealVideo
|