Update of /cvsroot/freevo/freevo/WIP/Aubin
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv22585
Added Files:
flacinfo.py
Log Message:
A bad hack to get the total samples in a FLAC file in order to calculate
the song length. It uses 'metaflac' to do so since I have no idea how to
parse the STREAMINFO block. It does calculate the song lengths properly, but
this is hardly the most elegant way of doing it.
I'm hoping someone who knows how to parse binary can add it since it's the
only relevant field in a FLAC file we can't parse.
--- NEW FILE: flacinfo.py ---
#if 0
# -----------------------------------------------------------------------
# $Id: flacinfo.py,v 1.1 2004/07/24 20:48:36 outlyer Exp $
# -----------------------------------------------------------------------
# $Log: flacinfo.py,v $
# Revision 1.1 2004/07/24 20:48:36 outlyer
# A bad hack to get the total samples in a FLAC file in order to calculate
# the song length. It uses 'metaflac' to do so since I have no idea how to
# parse the STREAMINFO block. It does calculate the song lengths properly, but
# this is hardly the most elegant way of doing it.
#
# I'm hoping someone who knows how to parse binary can add it since it's the
# only relevant field in a FLAC file we can't parse.
#
# Revision 1.7 2003/10/05 21:06:24 outlyer
# Cram the VORBIS_COMMENT fields into our standard artist/album/etc. fields
# so they work in Freevo.
#
# The only thing missing from having perfect FLAC support is a way to
# calculate the song length.
#
# Revision 1.6 2003/10/05 20:45:09 outlyer
# Fix some minor python issues. It works from mediatest.py now, but Freevo
# isn't using the tag information yet. I don't know why.
#
# Revision 1.5 2003/09/22 16:21:20 the_krow
# o ogg parsing should basically work
# o utf-8 for vorbis comments
#
# Revision 1.4 2003/08/30 09:36:22 dischi
# turn off some debug based on DEBUG
#
# Revision 1.3 2003/08/27 02:53:48 outlyer
# Still doesn't do anything, but at least compiles now; problem is I don't
# know how to conver the endian "headers" in to the types we expect, and I'm
# hardly an expert on binary data.
#
# But I flushed out the header types from the FLAC documentation and
# hopefully Thomas will know what to do...
#
# I can provide a FLAC file if necessary...
#
# Revision 1.2 2003/08/26 21:21:18 outlyer
# Fix two more Python 2.3 warnings.
#
# Revision 1.1 2003/08/18 13:39:52 the_krow
# Initial Import. Started on frame parsing.
#
# -----------------------------------------------------------------------
# MMPython - Media Metadata for Python
# Copyright (C) 2003 Thomas Schueppel, et. al
#
# 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
#
# -----------------------------------------------------------------------
#endif
from mmpython import mediainfo
import mmpython.audio.ogginfo as ogginfo
import mmpython
import struct
import re
# See: http://flac.sourceforge.net/format.html
class FlacInfo(mediainfo.MusicInfo):
def __init__(self,file):
mediainfo.MusicInfo.__init__(self)
if file.read(4) != 'fLaC':
self.valid = 0
return
self.valid = 1
while 1:
(blockheader,) = struct.unpack('>I',file.read(4))
lastblock = (blockheader >> 31) & 1
type = (blockheader >> 24) & 0x7F
numbytes = blockheader & 0xFFFFFF
if mmpython.mediainfo.DEBUG:
print "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
self.total = self._totalhelper(file)
self.length = self.total / self.samplerate
md5 = data[18:34]
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]
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'):
self.date = header['DATE']
if header.has_key('ENCODER'):
self.encoder = header['ENCODER']
if header.has_key('TRACKNUMBER'):
self.trackno = header['TRACKNUMBER']
self.appendtable('VORBISCOMMENT', header)
elif type == 5:
# CUESHEET
pass
else:
# UNKNOWN TYPE
pass
if lastblock:
break
def _totalhelper(self, file):
try:
import popen2
METAFLAC_EXE='/usr/bin/metaflac'
filename = file.name
command='--show-total-samples'
child = popen2.Popen3('%s %s "%s"' % (METAFLAC_EXE, command, filename))
list = child.fromchild.readlines()
total = int(list[0].replace('\n',''))
return total
except:
pass
def _extractHeaderString(self,header):
len = struct.unpack( '<I', header[:4] )[0]
return (len+4,unicode(header[4:4+len], 'utf-8'))
mmpython.registertype( 'application/flac', ('flac',), mediainfo.TYPE_MUSIC, FlacInfo )
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