source: trunk/essentials/dev-lang/python/Lib/plat-irix6/cddb.py@ 3393

Last change on this file since 3393 was 3225, checked in by bird, 19 years ago

Python 2.5
File size: 6.9 KB
Line 
1# This file implements a class which forms an interface to the .cddb
2# directory that is maintained by SGI's cdman program.
3#
4# Usage is as follows:
5#
6# import readcd
7# r = readcd.Readcd()
8# c = Cddb(r.gettrackinfo())
9#
10# Now you can use c.artist, c.title and c.track[trackno] (where trackno
11# starts at 1). When the CD is not recognized, all values will be the empty
12# string.
13# It is also possible to set the above mentioned variables to new values.
14# You can then use c.write() to write out the changed values to the
15# .cdplayerrc file.
16
17import string, posix, os
18
19_cddbrc = '.cddb'
20_DB_ID_NTRACKS = 5
21_dbid_map = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ@_=+abcdefghijklmnopqrstuvwxyz'
22def _dbid(v):
23 if v >= len(_dbid_map):
24 return string.zfill(v, 2)
25 else:
26 return _dbid_map[v]
27
28def tochash(toc):
29 if type(toc) == type(''):
30 tracklist = []
31 for i in range(2, len(toc), 4):
32 tracklist.append((None,
33 (int(toc[i:i+2]),
34 int(toc[i+2:i+4]))))
35 else:
36 tracklist = toc
37 ntracks = len(tracklist)
38 hash = _dbid((ntracks >> 4) & 0xF) + _dbid(ntracks & 0xF)
39 if ntracks <= _DB_ID_NTRACKS:
40 nidtracks = ntracks
41 else:
42 nidtracks = _DB_ID_NTRACKS - 1
43 min = 0
44 sec = 0
45 for track in tracklist:
46 start, length = track
47 min = min + length[0]
48 sec = sec + length[1]
49 min = min + sec / 60
50 sec = sec % 60
51 hash = hash + _dbid(min) + _dbid(sec)
52 for i in range(nidtracks):
53 start, length = tracklist[i]
54 hash = hash + _dbid(length[0]) + _dbid(length[1])
55 return hash
56
57class Cddb:
58 def __init__(self, tracklist):
59 if os.environ.has_key('CDDB_PATH'):
60 path = os.environ['CDDB_PATH']
61 cddb_path = path.split(',')
62 else:
63 home = os.environ['HOME']
64 cddb_path = [home + '/' + _cddbrc]
65
66 self._get_id(tracklist)
67
68 for dir in cddb_path:
69 file = dir + '/' + self.id + '.rdb'
70 try:
71 f = open(file, 'r')
72 self.file = file
73 break
74 except IOError:
75 pass
76 ntracks = int(self.id[:2], 16)
77 self.artist = ''
78 self.title = ''
79 self.track = [None] + [''] * ntracks
80 self.trackartist = [None] + [''] * ntracks
81 self.notes = []
82 if not hasattr(self, 'file'):
83 return
84 import re
85 reg = re.compile(r'^([^.]*)\.([^:]*):[\t ]+(.*)')
86 while 1:
87 line = f.readline()
88 if not line:
89 break
90 match = reg.match(line)
91 if not match:
92 print 'syntax error in ' + file
93 continue
94 name1, name2, value = match.group(1, 2, 3)
95 if name1 == 'album':
96 if name2 == 'artist':
97 self.artist = value
98 elif name2 == 'title':
99 self.title = value
100 elif name2 == 'toc':
101 if not self.toc:
102 self.toc = value
103 if self.toc != value:
104 print 'toc\'s don\'t match'
105 elif name2 == 'notes':
106 self.notes.append(value)
107 elif name1[:5] == 'track':
108 try:
109 trackno = int(name1[5:])
110 except ValueError:
111 print 'syntax error in ' + file
112 continue
113 if trackno > ntracks:
114 print 'track number %r in file %s out of range' % (trackno, file)
115 continue
116 if name2 == 'title':
117 self.track[trackno] = value
118 elif name2 == 'artist':
119 self.trackartist[trackno] = value
120 f.close()
121 for i in range(2, len(self.track)):
122 track = self.track[i]
123 # if track title starts with `,', use initial part
124 # of previous track's title
125 if track and track[0] == ',':
126 try:
127 off = self.track[i - 1].index(',')
128 except ValueError:
129 pass
130 else:
131 self.track[i] = self.track[i-1][:off] \
132 + track
133
134 def _get_id(self, tracklist):
135 # fill in self.id and self.toc.
136 # if the argument is a string ending in .rdb, the part
137 # upto the suffix is taken as the id.
138 if type(tracklist) == type(''):
139 if tracklist[-4:] == '.rdb':
140 self.id = tracklist[:-4]
141 self.toc = ''
142 return
143 t = []
144 for i in range(2, len(tracklist), 4):
145 t.append((None, \
146 (int(tracklist[i:i+2]), \
147 int(tracklist[i+2:i+4]))))
148 tracklist = t
149 ntracks = len(tracklist)
150 self.id = _dbid((ntracks >> 4) & 0xF) + _dbid(ntracks & 0xF)
151 if ntracks <= _DB_ID_NTRACKS:
152 nidtracks = ntracks
153 else:
154 nidtracks = _DB_ID_NTRACKS - 1
155 min = 0
156 sec = 0
157 for track in tracklist:
158 start, length = track
159 min = min + length[0]
160 sec = sec + length[1]
161 min = min + sec / 60
162 sec = sec % 60
163 self.id = self.id + _dbid(min) + _dbid(sec)
164 for i in range(nidtracks):
165 start, length = tracklist[i]
166 self.id = self.id + _dbid(length[0]) + _dbid(length[1])
167 self.toc = string.zfill(ntracks, 2)
168 for track in tracklist:
169 start, length = track
170 self.toc = self.toc + string.zfill(length[0], 2) + \
171 string.zfill(length[1], 2)
172
173 def write(self):
174 import posixpath
175 if os.environ.has_key('CDDB_WRITE_DIR'):
176 dir = os.environ['CDDB_WRITE_DIR']
177 else:
178 dir = os.environ['HOME'] + '/' + _cddbrc
179 file = dir + '/' + self.id + '.rdb'
180 if posixpath.exists(file):
181 # make backup copy
182 posix.rename(file, file + '~')
183 f = open(file, 'w')
184 f.write('album.title:\t' + self.title + '\n')
185 f.write('album.artist:\t' + self.artist + '\n')
186 f.write('album.toc:\t' + self.toc + '\n')
187 for note in self.notes:
188 f.write('album.notes:\t' + note + '\n')
189 prevpref = None
190 for i in range(1, len(self.track)):
191 if self.trackartist[i]:
192 f.write('track%r.artist:\t%s\n' % (i, self.trackartist[i]))
193 track = self.track[i]
194 try:
195 off = track.index(',')
196 except ValueError:
197 prevpref = None
198 else:
199 if prevpref and track[:off] == prevpref:
200 track = track[off:]
201 else:
202 prevpref = track[:off]
203 f.write('track%r.title:\t%s\n' % (i, track))
204 f.close()
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