/usr/share/pyshared/kaa/metadata/audio/ogg.py is in python-kaa-metadata 0.7.7+svn4596-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | # -*- coding: iso-8859-1 -*-
# -----------------------------------------------------------------------------
# ogg.py - ogg file parser (vorbis only)
# -----------------------------------------------------------------------------
# $Id: ogg.py 3818 2009-01-27 16:52:21Z dmeyer $
#
# -----------------------------------------------------------------------------
# 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 re
import os
import stat
import struct
import logging
# import kaa.metadata.audio core
import core
# get logging object
log = logging.getLogger('metadata')
VORBIS_PACKET_INFO = '\01vorbis'
VORBIS_PACKET_HEADER = '\03vorbis'
VORBIS_PACKET_SETUP = '\05vorbis'
class Ogg(core.Music):
def __init__(self,file):
core.Music.__init__(self)
h = file.read(4+1+1+20+1)
if h[:5] != "OggS\00":
log.info("Invalid header")
raise core.ParseError()
if ord(h[5]) != 2:
log.info("Invalid header type flag (trying to go ahead anyway)")
self.pageSegCount = ord(h[-1])
# Skip the PageSegCount
file.seek(self.pageSegCount,1)
h = file.read(7)
if h != VORBIS_PACKET_INFO:
log.info("Wrong vorbis header type, giving up.")
raise core.ParseError()
# http://wiki.xiph.org/index.php/MIME_Types_and_File_Extensions
self.mime = 'audio/x-vorbis+ogg'
header = {}
info = file.read(23)
self.version, self.channels, self.samplerate, bitrate_max, \
self.bitrate, bitrate_min, blocksize, \
framing = struct.unpack('<IBIiiiBB',info[:23])
self.bitrate = self.bitrate / 1000
# INFO Header, read Oggs and skip 10 bytes
h = file.read(4+10+13)
if h[:4] == 'OggS':
(serial, pagesequence, checksum, numEntries) = \
struct.unpack( '<14xIIIB', h )
# skip past numEntries
file.seek(numEntries,1)
h = file.read(7)
if h != VORBIS_PACKET_HEADER:
# Not a corrent info header
return
self.encoder = self._extractHeaderString(file)
numItems = struct.unpack('<I',file.read(4))[0]
for i in range(numItems):
s = self._extractHeaderString(file)
a = re.split('=',s)
header[(a[0]).upper()]=a[1]
# Put Header fields into info fields
if header.has_key('TITLE'):
self.title = header['TITLE']
if header.has_key('ALBUM'):
self.album = header['ALBUM']
if header.has_key('ARTIST'):
self.artist = header['ARTIST']
if header.has_key('COMMENT'):
self.comment = header['COMMENT']
if header.has_key('DATE'):
# FIXME: try to convert to timestamp
self.userdate = header['DATE']
if header.has_key('ENCODER'):
self.encoder = header['ENCODER']
if header.has_key('TRACKNUMBER'):
self.trackno = header['TRACKNUMBER']
self.type = 'OGG Vorbis'
self.subtype = ''
self.length = self._calculateTrackLength(file)
self._appendtable('VORBISCOMMENT',header)
def _extractHeaderString(self,f):
len = struct.unpack( '<I', f.read(4) )[0]
return unicode(f.read(len), 'utf-8')
def _calculateTrackLength(self,f):
# seek to the end of the stream, to avoid scanning the whole file
if (os.stat(f.name)[stat.ST_SIZE] > 20000):
f.seek(os.stat(f.name)[stat.ST_SIZE]-10000)
# read the rest of the file into a buffer
h = f.read()
granule_position = 0
# search for each 'OggS' in h
if len(h):
idx = h.rfind('OggS')
if idx < 0:
return 0
pageSize = 0
h = h[idx+4:]
(check, type, granule_position, absPos, serial, pageN, crc, \
segs) = struct.unpack( '<BBIIIIIB', h[:23] )
if check != 0:
log.debug(h[:10])
return
log.debug("granule = %d / %d" % (granule_position, absPos))
# the last one is the one we are interested in
return float(granule_position) / self.samplerate
Parser = Ogg
|