1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
#
# Python MPEG Information Module
#
# (c)Eduardo Roldan, Under the GPL License
# e-mail: trazor@adinet.com.uy
#
# Check the included README.TXT for instructions (no many '#' comments here)
import string
info = 'v 0.2 291099'
mpeg_strings = ['2.5', '', '2', '1']
layers = ['', 'III', 'II', 'I']
bitrates_mpeg1 = [ [],
[-1, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320],
[-1, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384],
[-1, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448]
]
# !! -1 = free bitrate
bitrates_mpeg2 = [ [],
[-1, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160],
[-1, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160],
[-1, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256]
]
frequency_strings = [ [11025, 12000, 8000],
[],
[22050, 24000, 16000,],
[44100, 48000, 32000,]
]
channel_mode_strings= ['Stereo', 'Joint Stereo', 'Dual Channel', 'Single Channel']
InvalidHeaderError = 'Can\'t read an invalid header'
NoHeaderError = 'No header present'
NoTagError = 'No id3 tag present'
#Extracted from mpg123 0.59q
genre_list = [
"Blues", "Classic Rock", "Country", "Dance", "Disco", "Funk", "Grunge", "Hip-Hop",
"Jazz", "Metal", "New Age", "Oldies", "Other", "Pop", "R&B", "Rap", "Reggae", "Rock",
"Techno", "Industrial", "Alternative", "Ska", "Death Metal", "Pranks", "Soundtrack",
"Euro-Techno", "Ambient", "Trip-Hop", "Vocal", "Jazz+Funk", "Fusion", "Trance",
"Classical", "Instrumental", "Acid", "House", "Game", "Sound Clip", "Gospel", "Noise",
"Alt", "Bass", "Soul", "Punk", "Space", "Meditative", "Instrumental Pop",
"Instrumental Rock", "Ethnic", "Gothic", "Darkwave", "Techno-Industrial",
"Electronic", "Pop-Folk", "Eurodance", "Dream", "Southern Rock", "Comedy", "Cult",
"Gangsta Rap", "Top 40", "Christian Rap", "Pop/Funk", "Jungle", "Native American",
"Cabaret", "New Wave", "Psychedelic", "Rave", "Showtunes", "Trailer", "Lo-Fi",
"Tribal", "Acid Punk", "Acid Jazz", "Polka", "Retro", "Musical", "Rock & Roll",
"Hard Rock", "Folk", "Folk/Rock", "National Folk", "Swing", "Fast-Fusion", "Bebob",
"Latin", "Revival", "Celtic", "Bluegrass", "Avantgarde", "Gothic Rock",
"Progressive Rock", "Psychedelic Rock", "Symphonic Rock", "Slow Rock", "Big Band",
"Chorus", "Easy Listening", "Acoustic", "Humour", "Speech", "Chanson", "Opera",
"Chamber Music", "Sonata", "Symphony", "Booty Bass", "Primus", "Porn Groove",
"Satire", "Slow Jam", "Club", "Tango", "Samba", "Folklore", "Ballad", "Power Ballad",
"Rhythmic Soul", "Freestyle", "Duet", "Punk Rock", "Drum Solo", "A Cappella",
"Euro-House", "Dance Hall", "Goa", "Drum & Bass", "Club-House", "Hardcore", "Terror",
"Indie", "BritPop", "Negerpunk", "Polsk Punk", "Beat", "Christian Gangsta Rap",
"Heavy Metal", "Black Metal", "Crossover", "Contemporary Christian",
"Christian Rock", "Merengue", "Salsa", "Thrash Metal", "Anime", "JPop", "Synthpop"
]
class open_mp3:
genre_no = 0
bitrate = 0
### Id3 ###
def __init__(self, file_to_open):
if type(file_to_open) == type(''):
self.file = open(file_to_open)
else:
self.file = file_to_open
self.file.seek(0, 2)
self.filesize = self.file.tell()
def __del__(self):
self.file.close()
def __call__(self):
self.sync_read_header(0, 1024)
mpeg = self.get_mpeg_version()
layer = self.get_layer()
protection = self.get_protection()
bitrate = `self.get_bitrate()`
frequency = `self.get_frequency()`
channel_mode = self.get_channel_mode()
copyright = self.get_copyright()
original = self.get_original()
length = string.zfill(self.get_length()[1], 2) + ':' + string.zfill(self.get_length()[2], 2)
framelength = `self.get_framelength()`
try:
self.read_tag()
genre = self.get_genre()
songname = self.songname
artist = self.artist
album = self.album
year = self.year
comment = self.comment
except NoTagError:
genre = songname = artist = album = year = comment = ''
return {'mpeg':mpeg, 'layer':layer, 'protection':protection,
'bitrate':bitrate, 'frequency':frequency,
'channel_mode':channel_mode, 'copyright':copyright,
'original':original, 'length':length,
'framelength':framelength,
'genre':genre, 'songname':songname, 'artist':artist,
'album':album, 'year':year, 'comment':comment,
'filesize':self.filesize}
def read_tag(self):
if self.filesize <= 128:
raise NoTagError
self.file.seek(-128, 2)
if self.file.read(3) == 'TAG':
self.songname = self.file.read(30)
self.artist = self.file.read(30)
self.album = self.file.read(30)
self.year = self.file.read(4)
self.comment = self.file.read(30)
self.genre_no = ord(self.file.read(1))
return 1
else:
raise NoTagError
def get_genre(self):
try:
return genre_list[self.genre_no]
except IndexError:
return 'Unknown'
### Header ###
def sync_read_header(self, offset = 0, depth = 0):
if depth == 0 or depth > self.filesize:
depth = self.filesize
self.file.seek(offset, 0)
while 1:
while self.file.tell() < depth:
if ord(self.file.read(1)) != 0xff:
break
second_byte = ord(self.file.read(1))
if second_byte >> 5 != 0x07:
self.file.seek(-1, 1)
break
self.sync_byte = 255
self.mpeg_version = (second_byte & 0x18) >> 3 # B
self.layer = (second_byte & 0x06) >> 1 # C
third_byte = ord(self.file.read(1))
self.bitrate = (third_byte & 0xf0) >> 4 # E
self.frequency = (third_byte & 0x0c) >> 2 # F
self.padding = (third_byte & 0x02) >> 1 # G
fourth_byte = ord(self.file.read(1))
self.emphasis = (fourth_byte & 0x03) # M
try:
self.check_header()
except InvalidHeaderError:
self.file.seek(-3, 1)
break
ctuple1 = self.mpeg_version, self.layer, self.frequency, self.emphasis
step_1_ = self.get_framelength()
self.file.seek(step_1_-4, 1)
try:
self.read_header(self.file.tell())
except InvalidHeaderError:
self.file.seek(-(step_1_+3), 1)
break
ctuple2 = self.mpeg_version, self.layer, self.frequency, self.emphasis
if ctuple1 == ctuple2:
return self.file.tell() - (step_1_+4)
else:
self.file.seek(-(step_1_+3), 1)
break
else:
raise NoHeaderError
def read_header(self, offset = 0):
# AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM
self.file.seek(offset, 0)
self.sync_byte = ord(self.file.read(1))
second_byte = ord(self.file.read(1))
self.mpeg_version = (second_byte & 0x18) >> 3 # B
self.layer = (second_byte & 0x06) >> 1 # C
self.protection = (second_byte & 0x01) # D
third_byte = ord(self.file.read(1))
self.bitrate = (third_byte & 0xf0) >> 4 # E
self.frequency = (third_byte & 0x0c) >> 2 # F
self.padding = (third_byte & 0x02) >> 1 # G
self.private = (third_byte & 0x01) # H
fourth_byte = ord(self.file.read(1))
self.channel_mode = (fourth_byte & 0xc0) >> 6 # I
self.mode_ext = (fourth_byte & 0x30) >> 4 # J
self.copyright = (fourth_byte & 0x08) >> 3 # K
self.original = (fourth_byte & 0x04) >> 2 # L
self.emphasis = (fourth_byte & 0x03) # M
self.check_header()
return 1
def check_header(self):
if self.sync_byte != 255 or self.mpeg_version == 1 or self.layer == 0\
or self.bitrate == 15 or self.frequency == 3 or self.emphasis == 2 :
raise InvalidHeaderError
def get_mpeg_version(self):
return mpeg_strings[self.mpeg_version]
def get_layer(self):
return layers[self.layer]
def get_protection(self):
if self.protection:
return 'No'
else:
return 'Yes'
def get_bitrate(self):
if self.mpeg_version == 3:
return bitrates_mpeg1[self.layer][self.bitrate]
elif self.mpeg_version == 2 or self.mpeg_version == 0:
return bitrates_mpeg2[self.layer][self.bitrate]
def get_frequency(self):
return frequency_strings[self.mpeg_version][self.frequency]
def get_channel_mode(self):
return channel_mode_strings[self.channel_mode]
def get_copyright(self):
if self.copyright:
return 'Yes'
else:
return 'No'
def get_original(self):
if self.original:
return 'Yes'
else:
return 'No'
def get_length(self):
if self.bitrate == 0:
return 0, 0, 0
else:
const = self.get_bitrate() * 125
seconds = self.filesize / const
minutes = seconds / 60
seconds_part = seconds % 60
return seconds, minutes, seconds_part
def get_framelength(self):
if self.layer == 1 or self.layer == 2:
return 144 * self.get_bitrate() * 1000 / self.get_frequency() + self.padding
else:
return 12 * self.get_bitrate() * 1000 / self.get_frequency() + self.padding
|
