[iamone]

Das iDrive erzeugt diese Bryce Dateien durch Negieren* aller Bits aus dem Original als kopiergeschützes Backup.

Dementsprechend ist:

- br3: mp4
- br4: mp3
- br5: wma

und eine einfache Umbennenung in .mp3 (trotz übereinstimmender Größe) *daher nicht möglich.

Hier hat ein findiger User ein Python Skript geschrieben, welches die Dateien wieder zurück negiert.

Aufgrund fehlender Testdateien und/oder BMW iDrive habe ich es natürlich nicht testen können.

Code:

#!/usr/bin/python
import os,struct,sys,string
#----------------------------------------------------------------------
# In my case, I've got a number of ogg files with embedded vorbis
# comments.  Script is run in some directory within that ogg
# collection, and it reads all the ogg files below that point
# converting the vorbis comments to id3 tags, creating the BR4
# files BMW wants.  You do have to create the BMWData / Music /
# data_1 file with all the directory names to read for it to
# restore properly.  So for a different car than my 2010, you could
# make a backup and then see if your structure is the same as my:
#
#   BMWData
#     BMWBackup.ver
#     Music
#       data_1                <-script creates this
#       media_directory_1     <-script creates this
#       media_directory_2     <-script creates this
#
# ...and update the script as necessary.  Code_1 and Code_2
# could also be unique to my car or the year or model.  I just
# copy a bunch of CD directories ripped in ogg format for other
# players into some fresh directory and then run this script
# from the top of that fresh directory to get a new USB load for
# the vehicle.
#----------------------------------------------------------------------

# base_directory=os.getenv('HOME')+'/conversion/BMWData/Music/'
base_directory='/media/disk/BMWData/Music/'
data_1=[]
code_1='1258287780'
code_2='8'
quality='160k'  # Or you can go down to 128k rate MP3 if acceptable
# I think a -q6 setting ogg file is the equivalent of a 192k MP3, but
# in a car I dunno if anyone but the most refined audiophile could
# hear the difference on our BMW speakers between 160k and a higher
# fidelity (and thus much larger) file.
map={'.BR3':'.mp4','.BR4':'.mp3','.BR5':'.wma',
     '.mp4':'.BR3','.mp3':'.BR4','.wma':'.BR5'}
number_of_files=0

print 'Removing existing',base_directory+'*'
# Caution: the following line removes existing USB music
# collection.  In your environment change the base_directory and
# comment out this line until it all works to your satisfaction.
os.system('rm -rf '+base_directory+'*')

# Get the count of all .ogg files below this point...
for root, dirs, files in os.walk('.', topdown=True):
  for name in files:
    filename=os.path.join(root, name)
    if filename.find('.ogg')>0:
      number_of_files+=1
file_number=0

# And then process all those .ogg files into .BR4 files
for root, dirs, files in os.walk('.', topdown=True):
  for name in files:
    filename=os.path.join(root, name)
    if filename.find('.ogg')>0:
      file_number+=1
      os.system('vorbiscomment -l '+filename+' > foo')
      fh=open('foo')
      fd=fh.readlines()
      os.unlink('foo')
      the_title=filename[filename.rfind('/')+1:-4]
      the_artist='Unknown'
      the_genre='Unknown'
      the_date='2009'
      the_album='Unknown'
      the_track='1'
      for l in fd:
        if   l.find('title=')==0:       the_title=l[6:-1]
        elif l.find('artist=')==0:      the_artist=l[7:-1]
        elif l.find('genre=')==0:       the_genre=l[6:-1]
        elif l.find('date=')==0:        the_date=l[5:-1]
        elif l.find('album=')==0:       the_album=l[6:-1]
        elif l.find('tracknumber=')==0: the_track=str(int(l[12:-1]))
      album_directory=string.lower(the_album.replace(' ','_'))
      data_1_entry='/'+album_directory+'/\t'+the_album+'\t'+code_1+'\t'+code_2+'\t\n'

      if not os.access(base_directory+album_directory,os.R_OK):
        os.mkdir(base_directory+album_directory)
      output_filename=base_directory+album_directory+'/'+the_title+'.mp3'
      sys.stdout.write('  '+str(file_number)+'/'+str(number_of_files)+' '+the_artist+','+the_album+','+the_track+':'+the_title+'...')
      sys.stdout.flush()
      # Create the mp3 from the ogg in the correct USB directory
      if os.access(output_filename,os.R_OK):
        os.unlink(output_filename)
      command='ffmpeg -i "'+filename+'" -ab '+quality+' "'+output_filename+'" >& /dev/null'
      os.system(command)
      sys.stdout.write(' MP3,')
      sys.stdout.flush()
      # Put the tag back on
      command= 'id3v2 -a "'+the_artist+'" -A "'+the_album+'" -t "'+the_title+\
               '" -g "'+the_genre+'" -y "'+the_date+'" -T "'+the_track+'" "'+\
               output_filename+'" >& /dev/null'
      os.system(command)
      sys.stdout.write(' ID3,')
      sys.stdout.flush()
      bmw_name=output_filename.replace('.mp3',map['.mp3'])
      ih=open(output_filename,'rb')
      oh=open(bmw_name,'wb')
      while True:
        element = ih.read(1)
        if len(element)>0:
          mybyte = struct.unpack("<b",element)[0]
          inverted_data = ~ mybyte
          oh.write(struct.pack(">b",inverted_data))
        else: break
      oh.close()
      sys.stdout.write(' Flipped.\n')
      os.unlink(output_filename)
      # Remove the .mp3 file now that the .BR4 is there...
      sys.stdout.flush()
      if not data_1_entry in data_1:
        data_1.append(data_1_entry)
    elif filename.find('.BR5')>0:
      # This was just to test/verify that a BR5 was just a flipped wma
      ih=open(filename,'rb')
      bmw_name=filename.replace('.BR5',map['.BR5'])
      oh=open(bmw_name,'wb')
      while True:
        # I know... one byte at a time is too slow...
        element = ih.read(1)
        if len(element)>0:
          mybyte = struct.unpack("<b",element)[0]
          inverted_data = ~ mybyte
          oh.write(struct.pack(">b",inverted_data))
        else: break
      oh.close()

print 'Writing out data_1 index'
data_1.sort()
fh=open(base_directory+'data_1','w')
fh.writelines(data_1)
fh.close()

print 'Done.  Size in Mb should be under 12500 for a 2010 iDrive'
os.system('du -ms '+base_directory)