/usr/share/pyshared/kaa/metadata/video/mp4.py is in python-kaa-metadata 0.7.7+svn4596-4.
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# -----------------------------------------------------------------------------
# mp4.py - mp4/mov file parser
# -----------------------------------------------------------------------------
# $Id: mp4.py 4340 2010-08-22 21:19:02Z tack $
#
# -----------------------------------------------------------------------------
# kaa-Metadata - Media Metadata for Python
# Copyright (C) 2003-2007 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 zlib
import logging
import StringIO
import struct
# import kaa.metadata.video core
import core
# get logging object
log = logging.getLogger('metadata')
# http://developer.apple.com/documentation/QuickTime/QTFF/index.html
# http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap4/\
# chapter_5_section_2.html#//apple_ref/doc/uid/TP40000939-CH206-BBCBIICE
# Note: May need to define custom log level to work like ATOM_DEBUG did here
QTUDTA = {
'nam': 'title',
'aut': 'artist',
'cpy': 'copyright'
}
QTLANGUAGES = {
0 : "en",
1 : "fr",
2 : "de",
3 : "it",
4 : "nl",
5 : "sv",
6 : "es",
7 : "da",
8 : "pt",
9 : "no",
10 : "he",
11 : "ja",
12 : "ar",
13 : "fi",
14 : "el",
15 : "is",
16 : "mt",
17 : "tr",
18 : "hr",
19 : "Traditional Chinese",
20 : "ur",
21 : "hi",
22 : "th",
23 : "ko",
24 : "lt",
25 : "pl",
26 : "hu",
27 : "et",
28 : "lv",
29 : "Lappish",
30 : "fo",
31 : "Farsi",
32 : "ru",
33 : "Simplified Chinese",
34 : "Flemish",
35 : "ga",
36 : "sq",
37 : "ro",
38 : "cs",
39 : "sk",
40 : "sl",
41 : "yi",
42 : "sr",
43 : "mk",
44 : "bg",
45 : "uk",
46 : "be",
47 : "uz",
48 : "kk",
49 : "az",
50 : "AzerbaijanAr",
51 : "hy",
52 : "ka",
53 : "mo",
54 : "ky",
55 : "tg",
56 : "tk",
57 : "mn",
58 : "MongolianCyr",
59 : "ps",
60 : "ku",
61 : "ks",
62 : "sd",
63 : "bo",
64 : "ne",
65 : "sa",
66 : "mr",
67 : "bn",
68 : "as",
69 : "gu",
70 : "pa",
71 : "or",
72 : "ml",
73 : "kn",
74 : "ta",
75 : "te",
76 : "si",
77 : "my",
78 : "Khmer",
79 : "lo",
80 : "vi",
81 : "id",
82 : "tl",
83 : "MalayRoman",
84 : "MalayArabic",
85 : "am",
86 : "ti",
87 : "om",
88 : "so",
89 : "sw",
90 : "Ruanda",
91 : "Rundi",
92 : "Chewa",
93 : "mg",
94 : "eo",
128 : "cy",
129 : "eu",
130 : "ca",
131 : "la",
132 : "qu",
133 : "gn",
134 : "ay",
135 : "tt",
136 : "ug",
137 : "Dzongkha",
138 : "JavaneseRom",
}
class MPEG4(core.AVContainer):
"""
Parser for the MP4 container format. This format is mostly
identical to Apple Quicktime and 3GP files. It maps to mp4, mov,
qt and some other extensions.
"""
table_mapping = { 'QTUDTA': QTUDTA }
def __init__(self,file):
core.AVContainer.__init__(self)
self._references = []
self.mime = 'video/quicktime'
self.type = 'Quicktime Video'
h = file.read(8)
try:
(size,type) = struct.unpack('>I4s',h)
except struct.error:
# EOF.
raise core.ParseError()
if type == 'ftyp':
# file type information
if size >= 12:
# this should always happen
if file.read(4) != 'qt ':
# not a quicktime movie, it is a mpeg4 container
self.mime = 'video/mp4'
self.type = 'MPEG-4 Video'
size -= 4
file.seek(size-8, 1)
h = file.read(8)
(size,type) = struct.unpack('>I4s',h)
while type in ('mdat', 'skip'):
# movie data at the beginning, skip
file.seek(size-8, 1)
h = file.read(8)
(size,type) = struct.unpack('>I4s',h)
if not type in ('moov', 'wide', 'free'):
log.debug('invalid header: %r' % type)
raise core.ParseError()
# Extended size
if size == 1:
size = struct.unpack('>Q', file.read(8))
# Back over the atom header we just read, since _readatom expects the
# file position to be at the start of an atom.
file.seek(-8, 1)
while self._readatom(file):
pass
if self._references:
self._set('references', self._references)
def _readatom(self, file):
s = file.read(8)
if len(s) < 8:
return 0
atomsize,atomtype = struct.unpack('>I4s', s)
if not str(atomtype).decode('latin1').isalnum():
# stop at nonsense data
return 0
log.debug('%s [%X]' % (atomtype,atomsize))
if atomtype == 'udta':
# Userdata (Metadata)
pos = 0
tabl = {}
i18ntabl = {}
atomdata = file.read(atomsize-8)
while pos < atomsize-12:
(datasize, datatype) = struct.unpack('>I4s', atomdata[pos:pos+8])
if ord(datatype[0]) == 169:
# i18n Metadata...
mypos = 8+pos
while mypos + 4 < datasize+pos:
# first 4 Bytes are i18n header
(tlen, lang) = struct.unpack('>HH', atomdata[mypos:mypos+4])
i18ntabl[lang] = i18ntabl.get(lang, {})
l = atomdata[mypos+4:mypos+tlen+4]
i18ntabl[lang][datatype[1:]] = l
mypos += tlen+4
elif datatype == 'WLOC':
# Drop Window Location
pass
else:
if ord(atomdata[pos+8:pos+datasize][0]) > 1:
tabl[datatype] = atomdata[pos+8:pos+datasize]
pos += datasize
if len(i18ntabl.keys()) > 0:
for k in i18ntabl.keys():
if QTLANGUAGES.has_key(k) and QTLANGUAGES[k] == 'en':
self._appendtable('QTUDTA', i18ntabl[k])
self._appendtable('QTUDTA', tabl)
else:
log.debug('NO i18')
self._appendtable('QTUDTA', tabl)
elif atomtype == 'trak':
atomdata = file.read(atomsize-8)
pos = 0
trackinfo = {}
tracktype = None
while pos < atomsize-8:
(datasize, datatype) = struct.unpack('>I4s', atomdata[pos:pos+8])
if datatype == 'tkhd':
tkhd = struct.unpack('>6I8x4H36xII', atomdata[pos+8:pos+datasize])
trackinfo['width'] = tkhd[10] >> 16
trackinfo['height'] = tkhd[11] >> 16
trackinfo['id'] = tkhd[3]
try:
# XXX Timestamp of Seconds is since January 1st 1904!
# XXX 2082844800 is the difference between Unix and
# XXX Apple time. FIXME to work on Apple, too
self.timestamp = int(tkhd[1]) - 2082844800
except Exception, e:
log.exception('There was trouble extracting timestamp')
elif datatype == 'mdia':
pos += 8
datasize -= 8
log.debug('--> mdia information')
while datasize:
mdia = struct.unpack('>I4s', atomdata[pos:pos+8])
if mdia[1] == 'mdhd':
# Parse based on version of mdhd header. See
# http://wiki.multimedia.cx/index.php?title=QuickTime_container#mdhd
ver = ord(atomdata[pos + 8])
if ver == 0:
mdhd = struct.unpack('>IIIIIhh', atomdata[pos+8:pos+8+24])
elif ver == 1:
mdhd = struct.unpack('>IQQIQhh', atomdata[pos+8:pos+8+36])
else:
mdhd = None
if mdhd:
# duration / time scale
trackinfo['length'] = mdhd[4] / mdhd[3]
if mdhd[5] in QTLANGUAGES:
trackinfo['language'] = QTLANGUAGES[mdhd[5]]
# mdhd[6] == quality
self.length = max(self.length, mdhd[4] / mdhd[3])
elif mdia[1] == 'minf':
# minf has only atoms inside
pos -= (mdia[0] - 8)
datasize += (mdia[0] - 8)
elif mdia[1] == 'stbl':
# stbl has only atoms inside
pos -= (mdia[0] - 8)
datasize += (mdia[0] - 8)
elif mdia[1] == 'hdlr':
hdlr = struct.unpack('>I4s4s', atomdata[pos+8:pos+8+12])
if hdlr[1] == 'mhlr':
if hdlr[2] == 'vide':
tracktype = 'video'
if hdlr[2] == 'soun':
tracktype = 'audio'
elif mdia[1] == 'stsd':
stsd = struct.unpack('>2I', atomdata[pos+8:pos+8+8])
if stsd[1] > 0:
codec = atomdata[pos+16:pos+16+8]
codec = struct.unpack('>I4s', codec)
trackinfo['codec'] = codec[1]
if codec[1] == 'jpeg':
tracktype = 'image'
elif mdia[1] == 'dinf':
dref = struct.unpack('>I4s', atomdata[pos+8:pos+8+8])
log.debug(' --> %s, %s (useless)' % mdia)
if dref[1] == 'dref':
num = struct.unpack('>I', atomdata[pos+20:pos+20+4])[0]
rpos = pos+20+4
for ref in range(num):
# FIXME: do somthing if this references
ref = struct.unpack('>I3s', atomdata[rpos:rpos+7])
data = atomdata[rpos+7:rpos+ref[0]]
rpos += ref[0]
else:
if mdia[1].startswith('st'):
log.debug(' --> %s, %s (sample)' % mdia)
elif mdia[1] in ('vmhd',) and not tracktype:
# indicates that this track is video
tracktype = 'video'
elif mdia[1] in ('vmhd', 'smhd') and not tracktype:
# indicates that this track is audio
tracktype = 'audio'
else:
log.debug(' --> %s, %s (unknown)' % mdia)
pos += mdia[0]
datasize -= mdia[0]
elif datatype == 'udta':
log.debug(struct.unpack('>I4s', atomdata[:8]))
else:
if datatype == 'edts':
log.debug('--> %s [%d] (edit list)' % \
(datatype, datasize))
else:
log.debug('--> %s [%d] (unknown)' % \
(datatype, datasize))
pos += datasize
info = None
if tracktype == 'video':
info = core.VideoStream()
self.video.append(info)
if tracktype == 'audio':
info = core.AudioStream()
self.audio.append(info)
if info:
for key, value in trackinfo.items():
setattr(info, key, value)
elif atomtype == 'mvhd':
# movie header
mvhd = struct.unpack('>6I2h', file.read(28))
self.length = max(self.length, mvhd[4] / mvhd[3])
self.volume = mvhd[6]
file.seek(atomsize-8-28,1)
elif atomtype == 'cmov':
# compressed movie
datasize, atomtype = struct.unpack('>I4s', file.read(8))
if not atomtype == 'dcom':
return atomsize
method = struct.unpack('>4s', file.read(datasize-8))[0]
datasize, atomtype = struct.unpack('>I4s', file.read(8))
if not atomtype == 'cmvd':
return atomsize
if method == 'zlib':
data = file.read(datasize-8)
try:
decompressed = zlib.decompress(data)
except Exception, e:
try:
decompressed = zlib.decompress(data[4:])
except Exception, e:
log.exception('There was a proble decompressiong atom')
return atomsize
decompressedIO = StringIO.StringIO(decompressed)
while self._readatom(decompressedIO):
pass
else:
log.info('unknown compression %s' % method)
# unknown compression method
file.seek(datasize-8,1)
elif atomtype == 'moov':
# decompressed movie info
while self._readatom(file):
pass
elif atomtype == 'mdat':
pos = file.tell() + atomsize - 8
# maybe there is data inside the mdat
log.info('parsing mdat')
while self._readatom(file):
pass
log.info('end of mdat')
file.seek(pos, 0)
elif atomtype == 'rmra':
# reference list
while self._readatom(file):
pass
elif atomtype == 'rmda':
# reference
atomdata = file.read(atomsize-8)
pos = 0
url = ''
quality = 0
datarate = 0
while pos < atomsize-8:
(datasize, datatype) = struct.unpack('>I4s', atomdata[pos:pos+8])
if datatype == 'rdrf':
rflags, rtype, rlen = struct.unpack('>I4sI', atomdata[pos+8:pos+20])
if rtype == 'url ':
url = atomdata[pos+20:pos+20+rlen]
if url.find('\0') > 0:
url = url[:url.find('\0')]
elif datatype == 'rmqu':
quality = struct.unpack('>I', atomdata[pos+8:pos+12])[0]
elif datatype == 'rmdr':
datarate = struct.unpack('>I', atomdata[pos+12:pos+16])[0]
pos += datasize
if url:
self._references.append((url, quality, datarate))
else:
if not atomtype in ('wide', 'free'):
log.info('unhandled base atom %s' % atomtype)
# Skip unknown atoms
try:
file.seek(atomsize-8,1)
except IOError:
return 0
return atomsize
Parser = MPEG4
|