cddb.py :  » Language-Interface » ChinesePython » chinesepython2.1.3-0.4 » Lib » plat-irix5 » Python Open Source

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Python Open Source » Language Interface » ChinesePython 
ChinesePython » chinesepython2.1.3 0.4 » Lib » plat irix5 » cddb.py
# This file implements a class which forms an interface to the .cddb
# directory that is maintained by SGI's cdman program.
#
# Usage is as follows:
#
# import readcd
# r = readcd.Readcd()
# c = Cddb(r.gettrackinfo())
#
# Now you can use c.artist, c.title and c.track[trackno] (where trackno
# starts at 1).  When the CD is not recognized, all values will be the empty
# string.
# It is also possible to set the above mentioned variables to new values.
# You can then use c.write() to write out the changed values to the
# .cdplayerrc file.

import string, posix, os

_cddbrc = '.cddb'
_DB_ID_NTRACKS = 5
_dbid_map = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ@_=+abcdefghijklmnopqrstuvwxyz'
def _dbid(v):
  if v >= len(_dbid_map):
    return string.zfill(v, 2)
  else:
    return _dbid_map[v]

def tochash(toc):
  if type(toc) == type(''):
    tracklist = []
    for i in range(2, len(toc), 4):
      tracklist.append((None,
          (int(toc[i:i+2]),
           int(toc[i+2:i+4]))))
  else:
    tracklist = toc
  ntracks = len(tracklist)
  hash = _dbid((ntracks >> 4) & 0xF) + _dbid(ntracks & 0xF)
  if ntracks <= _DB_ID_NTRACKS:
    nidtracks = ntracks
  else:
    nidtracks = _DB_ID_NTRACKS - 1
    min = 0
    sec = 0
    for track in tracklist:
      start, length = track
      min = min + length[0]
      sec = sec + length[1]
    min = min + sec / 60
    sec = sec % 60
    hash = hash + _dbid(min) + _dbid(sec)
  for i in range(nidtracks):
    start, length = tracklist[i]
    hash = hash + _dbid(length[0]) + _dbid(length[1])
  return hash
  
class Cddb:
  def __init__(self, tracklist):
    if os.environ.has_key('CDDB_PATH'):
      path = os.environ['CDDB_PATH']
      cddb_path = path.split(',')
    else:
      home = os.environ['HOME']
      cddb_path = [home + '/' + _cddbrc]

    self._get_id(tracklist)

    for dir in cddb_path:
      file = dir + '/' + self.id + '.rdb'
      try:
        f = open(file, 'r')
        self.file = file
        break
      except IOError:
        pass
    ntracks = int(self.id[:2], 16)
    self.artist = ''
    self.title = ''
    self.track = [None] + [''] * ntracks
    self.trackartist = [None] + [''] * ntracks
    self.notes = []
    if not hasattr(self, 'file'):
      return
    import re
    reg = re.compile(r'^([^.]*)\.([^:]*):[\t ]+(.*)')
    while 1:
      line = f.readline()
      if not line:
        break
      match = reg.match(line)
      if not match:
        print 'syntax error in ' + file
        continue
      name1, name2, value = match.group(1, 2, 3)
      if name1 == 'album':
        if name2 == 'artist':
          self.artist = value
        elif name2 == 'title':
          self.title = value
        elif name2 == 'toc':
          if not self.toc:
            self.toc = value
          if self.toc != value:
            print 'toc\'s don\'t match'
        elif name2 == 'notes':
          self.notes.append(value)
      elif name1[:5] == 'track':
        try:
          trackno = int(name1[5:])
        except strings.atoi_error:
          print 'syntax error in ' + file
          continue
        if trackno > ntracks:
          print 'track number ' + `trackno` + \
              ' in file ' + file + \
              ' out of range'
          continue
        if name2 == 'title':
          self.track[trackno] = value
        elif name2 == 'artist':
          self.trackartist[trackno] = value
    f.close()
    for i in range(2, len(self.track)):
      track = self.track[i]
      # if track title starts with `,', use initial part
      # of previous track's title
      if track and track[0] == ',':
        try:
          off = self.track[i - 1].index(',')
        except ValueError:
          pass
        else:
          self.track[i] = self.track[i-1][:off] \
              + track

  def _get_id(self, tracklist):
    # fill in self.id and self.toc.
    # if the argument is a string ending in .rdb, the part
    # upto the suffix is taken as the id.
    if type(tracklist) == type(''):
      if tracklist[-4:] == '.rdb':
        self.id = tracklist[:-4]
        self.toc = ''
        return
      t = []
      for i in range(2, len(tracklist), 4):
        t.append((None, \
            (int(tracklist[i:i+2]), \
             int(tracklist[i+2:i+4]))))
      tracklist = t
    ntracks = len(tracklist)
    self.id = _dbid((ntracks >> 4) & 0xF) + _dbid(ntracks & 0xF)
    if ntracks <= _DB_ID_NTRACKS:
      nidtracks = ntracks
    else:
      nidtracks = _DB_ID_NTRACKS - 1
      min = 0
      sec = 0
      for track in tracklist:
        start, length = track
        min = min + length[0]
        sec = sec + length[1]
      min = min + sec / 60
      sec = sec % 60
      self.id = self.id + _dbid(min) + _dbid(sec)
    for i in range(nidtracks):
      start, length = tracklist[i]
      self.id = self.id + _dbid(length[0]) + _dbid(length[1])
    self.toc = string.zfill(ntracks, 2)
    for track in tracklist:
      start, length = track
      self.toc = self.toc + string.zfill(length[0], 2) + \
          string.zfill(length[1], 2)

  def write(self):
    import posixpath
    if os.environ.has_key('CDDB_WRITE_DIR'):
      dir = os.environ['CDDB_WRITE_DIR']
    else:
      dir = os.environ['HOME'] + '/' + _cddbrc
    file = dir + '/' + self.id + '.rdb'
    if posixpath.exists(file):
      # make backup copy
      posix.rename(file, file + '~')
    f = open(file, 'w')
    f.write('album.title:\t' + self.title + '\n')
    f.write('album.artist:\t' + self.artist + '\n')
    f.write('album.toc:\t' + self.toc + '\n')
    for note in self.notes:
      f.write('album.notes:\t' + note + '\n')
    prevpref = None
    for i in range(1, len(self.track)):
      if self.trackartist[i]:
        f.write('track'+`i`+'.artist:\t'+self.trackartist[i]+'\n')
      track = self.track[i]
      try:
        off = track.index(',')
      except ValuError:
        prevpref = None
      else:
        if prevpref and track[:off] == prevpref:
          track = track[off:]
        else:
          prevpref = track[:off]
      f.write('track' + `i` + '.title:\t' + track + '\n')
    f.close()
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