Source code for pytomo.kaa_metadata.audio.flac
# -*- coding: iso-8859-1 -*-
# -----------------------------------------------------------------------------
# flac.py - flac file parser
# -----------------------------------------------------------------------------
# $Id: flac.py 3219 2008-03-23 18:19:28Z tack $
#
# -----------------------------------------------------------------------------
# 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
#
# -----------------------------------------------------------------------------
from __future__ import absolute_import
__all__ = ['Parser']
# python imports
import struct
import re
import logging
# import kaa_metadata.audio core
from . import core
# get logging object
log = logging.getLogger('metadata')
# See: http://flac.sourceforge.net/format.html
class Flac(core.Music):
def __init__(self,file):
core.Music.__init__(self)
if file.read(4) != 'fLaC':
raise core.ParseError()
# http://wiki.xiph.org/index.php/MIME_Types_and_File_Extensions
self.mime = 'application/flac'
while 1:
(blockheader,) = struct.unpack('>I',file.read(4))
lastblock = (blockheader >> 31) & 1
type = (blockheader >> 24) & 0x7F
numbytes = blockheader & 0xFFFFFF
log.debug("Last?: %d, NumBytes: %d, Type: %d" % \
(lastblock, numbytes, type))
# Read this blocks the data
data = file.read(numbytes)
if type == 0:
# STREAMINFO
bits = struct.unpack('>L', data[10:14])[0]
self.samplerate = (bits >> 12) & 0xFFFFF
self.channels = ((bits >> 9) & 7) + 1
self.samplebits = ((bits >> 4) & 0x1F) + 1
md5 = data[18:34]
# Number of samples is bits 108-144 in block.
samples = ((ord(data[13]) & 0x0f) << 32) + struct.unpack('>L', data[14:18])[0]
self.length = float(samples) / self.samplerate
elif type == 1:
# PADDING
pass
elif type == 2:
# APPLICATION
pass
elif type == 3:
# SEEKTABLE
pass
elif type == 4:
# VORBIS_COMMENT
skip, self.vendor = self._extractHeaderString(data)
num, = struct.unpack('<I', data[skip:skip+4])
start = skip+4
header = {}
for i in range(num):
(nextlen, s) = self._extractHeaderString(data[start:])
start += nextlen
a = re.split('=',s)
header[(a[0]).upper()]=a[1]
map = {
u'TITLE': 'title', u'ALBUM': 'album', u'ARTIST': 'artist', u'COMMENT': 'comment',
u'ENCODER': 'encoder', u'TRACKNUMBER': 'trackno', u'TRACKTOTAL': 'trackof',
# FIXME: try to convert userdate to timestamp
u'DATE': 'userdate',
}
for key, attr in map.items():
if key in header:
setattr(self, attr, header[key])
self._appendtable('VORBISCOMMENT', header)
elif type == 5:
# CUESHEET
pass
else:
# UNKNOWN TYPE
pass
if lastblock:
break
def _extractHeaderString(self,header):
len = struct.unpack( '<I', header[:4] )[0]
return (len+4,unicode(header[4:4+len], 'utf-8'))
Parser = Flac