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2to3.html
63.71
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__builtin__.html
11.79
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__future__.html
15.58
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__main__.html
8.33
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_winreg.html
73.99
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abc.html
26.82
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aepack.html
15.47
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aetools.html
18.79
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aetypes.html
27.08
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aifc.html
29.59
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al.html
22.13
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allos.html
35.48
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anydbm.html
19.31
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archiving.html
10.64
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argparse.html
269.59
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array.html
35.35
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ast.html
42.42
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asynchat.html
35.84
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asyncore.html
43.22
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atexit.html
19.23
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audioop.html
41.32
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autogil.html
9.77
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base64.html
24.8
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basehttpserver.html
40.6
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bastion.html
13.02
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bdb.html
50.06
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binascii.html
26.64
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binhex.html
12.66
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bisect.html
28.52
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bsddb.html
32.02
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bz2.html
31.92
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calendar.html
50.16
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carbon.html
54.14
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cd.html
35.24
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cgi.html
58.4
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cgihttpserver.html
15.12
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cgitb.html
13.5
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chunk.html
17.41
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cmath.html
32.41
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cmd.html
32.69
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code.html
28.92
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codecs.html
125.92
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codeop.html
16.42
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collections.html
150.36
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colorpicker.html
9.02
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colorsys.html
14.38
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commands.html
16.63
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compileall.html
21.18
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compiler.html
78.14
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configparser.html
73.92
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constants.html
14.68
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contextlib.html
22.91
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cookie.html
45.38
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cookielib.html
102.78
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copy.html
14.21
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copy_reg.html
15.82
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crypt.html
11.62
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crypto.html
8.35
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csv.html
82.79
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ctypes.html
280.57
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curses.ascii.html
28.97
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curses.html
200.94
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curses.panel.html
18.43
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custominterp.html
8.59
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datatypes.html
18.84
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datetime.html
261.02
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dbhash.html
18.4
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dbm.html
14.75
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debug.html
11.28
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decimal.html
239.14
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development.html
15.27
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difflib.html
96.93
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dircache.html
13.66
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dis.html
96.52
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distribution.html
8.27
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distutils.html
10.97
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dl.html
19.27
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doctest.html
193.18
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docxmlrpcserver.html
20.02
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dumbdbm.html
16.74
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dummy_thread.html
11.04
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dummy_threading.html
9.96
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easydialogs.html
38.83
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email-examples.html
47.2
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email.charset.html
32.45
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email.encoders.html
14.09
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email.errors.html
19.2
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email.generator.html
24.78
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email.header.html
31.12
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email.html
55.3
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email.iterators.html
14.22
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email.message.html
74.91
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email.mime.html
34.51
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email.parser.html
37.09
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email.utils.html
30.04
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ensurepip.html
20.21
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errno.html
52.31
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exceptions.html
73.4
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fcntl.html
27.85
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filecmp.html
26.49
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fileformats.html
10.21
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fileinput.html
29.36
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filesys.html
11.55
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fl.html
71.58
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fm.html
15
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fnmatch.html
17.78
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formatter.html
43.91
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fpectl.html
17.84
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fpformat.html
12.65
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fractions.html
27.17
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framework.html
44.24
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frameworks.html
8.11
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ftplib.html
56.56
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functions.html
216.84
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functools.html
31.06
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future_builtins.html
15.9
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gc.html
30.74
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gdbm.html
19.35
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gensuitemodule.html
14.54
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getopt.html
26.56
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getpass.html
12.5
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gettext.html
91.32
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gl.html
26.71
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glob.html
15.42
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grp.html
12.33
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gzip.html
21.95
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hashlib.html
27.4
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heapq.html
36.72
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hmac.html
15.97
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hotshot.html
22.69
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htmllib.html
29.9
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htmlparser.html
45.11
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httplib.html
78.55
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i18n.html
10.61
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ic.html
22.03
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idle.html
45.74
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imageop.html
20.94
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imaplib.html
69.9
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imgfile.html
14.91
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imghdr.html
13.43
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imp.html
41.48
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importlib.html
10.27
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imputil.html
36.11
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index.html
82.54
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inspect.html
64.31
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internet.html
26.77
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intro.html
9.76
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io.html
122.3
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ipc.html
17.18
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itertools.html
129.91
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jpeg.html
15.36
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json.html
79.09
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keyword.html
9.27
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language.html
12.35
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linecache.html
12.7
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locale.html
68.54
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logging.config.html
82.23
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logging.handlers.html
91.96
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logging.html
123.15
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mac.html
24.49
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macos.html
18.51
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macosa.html
14.55
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macostools.html
19.67
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macpath.html
9.19
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mailbox.html
185.53
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mailcap.html
15.3
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markup.html
20.37
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marshal.html
19.88
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math.html
50.52
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md5.html
16.65
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mhlib.html
30.04
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mimetools.html
23.84
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mimetypes.html
35.82
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mimewriter.html
18.19
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mimify.html
16.96
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miniaeframe.html
14.5
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misc.html
7.77
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mm.html
10.19
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mmap.html
33.52
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modulefinder.html
19.85
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modules.html
9.68
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msilib.html
72.78
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msvcrt.html
24.1
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multifile.html
28.82
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multiprocessing.html
423.97
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mutex.html
13.56
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netdata.html
19.28
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netrc.html
15.51
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new.html
16.1
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nis.html
13.19
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nntplib.html
51.08
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numbers.html
40.91
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numeric.html
14.85
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operator.html
118.32
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optparse.html
251.08
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os.html
270.49
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os.path.html
48.87
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ossaudiodev.html
49.79
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othergui.html
9.98
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parser.html
44.52
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pdb.html
41.44
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persistence.html
16.25
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pickle.html
107.94
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pickletools.html
13.21
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pipes.html
21.85
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pkgutil.html
30.59
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platform.html
40.14
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plistlib.html
20.96
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popen2.html
30.13
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poplib.html
27.93
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posix.html
17.27
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posixfile.html
23.68
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pprint.html
36.42
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profile.html
76.65
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pty.html
11.42
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pwd.html
13.53
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py_compile.html
13.33
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pyclbr.html
18.14
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pydoc.html
14.33
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pyexpat.html
93.28
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python.html
13.53
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queue.html
29.64
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quopri.html
14.5
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random.html
47.78
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re.html
163.11
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readline.html
41.2
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repr.html
24.57
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resource.html
30.86
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restricted.html
12.69
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rexec.html
43.59
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rfc822.html
51.25
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rlcompleter.html
15.29
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robotparser.html
15.01
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runpy.html
23.55
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sched.html
21.76
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scrolledtext.html
10.67
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select.html
50.17
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sets.html
39.92
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sgi.html
11.09
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sgmllib.html
38.77
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sha.html
14.55
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shelve.html
32.93
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shlex.html
38.43
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shutil.html
49.49
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signal.html
36.52
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simplehttpserver.html
21.57
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simplexmlrpcserver.html
40.41
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site.html
29
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smtpd.html
15.64
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smtplib.html
51.86
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sndhdr.html
12.05
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socket.html
126.94
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socketserver.html
81.38
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someos.html
17.09
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spwd.html
12.25
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sqlite3.html
154.12
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ssl.html
214.5
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stat.html
41.11
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statvfs.html
13.24
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stdtypes.html
309.83
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string.html
129.58
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stringio.html
21.1
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stringprep.html
21.4
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strings.html
16.42
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struct.html
47.68
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subprocess.html
117
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sun.html
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sunau.html
35.43
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sunaudio.html
21.05
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symbol.html
9.06
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symtable.html
29.03
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sys.html
118.12
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sysconfig.html
28.8
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syslog.html
21.29
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tabnanny.html
12.78
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tarfile.html
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telnetlib.html
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tempfile.html
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termios.html
19.22
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test.html
61.42
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textwrap.html
32.28
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thread.html
22.67
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threading.html
92.04
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time.html
65.55
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timeit.html
44.38
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tix.html
56.73
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tk.html
26.76
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tkinter.html
86.67
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token.html
27.31
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tokenize.html
21.69
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trace.html
33.91
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traceback.html
44.22
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ttk.html
123.83
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tty.html
10.95
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turtle.html
246.17
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types.html
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undoc.html
25.54
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unicodedata.html
22.64
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unittest.html
246.75
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unix.html
11.9
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urllib.html
71.61
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urllib2.html
128.77
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urlparse.html
49.04
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user.html
13.41
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userdict.html
32.96
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uu.html
13.25
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uuid.html
33.55
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warnings.html
51.86
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wave.html
29.08
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weakref.html
41.14
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webbrowser.html
29.53
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whichdb.html
10.44
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windows.html
10.37
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winsound.html
22.56
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wsgiref.html
94.38
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xdrlib.html
38.05
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xml.dom.html
110.39
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xml.dom.minidom.html
45.23
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xml.dom.pulldom.html
16.32
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xml.etree.elementtree.html
124.2
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xml.html
18.76
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xml.sax.handler.html
47.5
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xml.sax.html
26.04
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xml.sax.reader.html
51.4
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xml.sax.utils.html
18.11
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xmlrpclib.html
71.79
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zipfile.html
67.26
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zipimport.html
24.32
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zlib.html
34.41
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<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> <title>21.3. aifc — Read and write AIFF and AIFC files — Python 2.7.18 documentation</title> <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> <link rel="stylesheet" type="text/css" href="../_static/classic.css" /> <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script> <script src="../_static/jquery.js"></script> <script src="../_static/underscore.js"></script> <script src="../_static/doctools.js"></script> <script src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.18 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="21.4. sunau — Read and write Sun AU files" href="sunau.html" /> <link rel="prev" title="21.2. imageop — Manipulate raw image data" href="imageop.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="file:///usr/share/doc/python2.7/html/library/aifc.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;"> This document is for an old version of Python that is <a href="https://devguide.python.org/devcycle/#end-of-life-branches">no longer supported</a>. You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/library/aifc.html"> Python documentation for the Python3 version packaged in this release</a>. </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="sunau.html" title="21.4. sunau — Read and write Sun AU files" accesskey="N">next</a> |</li> <li class="right" > <a href="imageop.html" title="21.2. imageop — Manipulate raw image data" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="mm.html" accesskey="U"><span class="section-number">21. </span>Multimedia Services</a> »</li> <li class="nav-item nav-item-this"><a href=""><span class="section-number">21.3. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">aifc</span></code> — Read and write AIFF and AIFC files</a></li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="module-aifc"> <span id="aifc-read-and-write-aiff-and-aifc-files"></span><h1><span class="section-number">21.3. </span><a class="reference internal" href="#module-aifc" title="aifc: Read and write audio files in AIFF or AIFC format."><code class="xref py py-mod docutils literal notranslate"><span class="pre">aifc</span></code></a> — Read and write AIFF and AIFC files<a class="headerlink" href="#module-aifc" title="Permalink to this headline">¶</a></h1> <p id="index-0"><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/aifc.py">Lib/aifc.py</a></p> <hr class="docutils" /> <p>This module provides support for reading and writing AIFF and AIFF-C files. AIFF is Audio Interchange File Format, a format for storing digital audio samples in a file. AIFF-C is a newer version of the format that includes the ability to compress the audio data.</p> <div class="admonition note"> <p class="admonition-title">Note</p> <p>Some operations may only work under IRIX; these will raise <code class="xref py py-exc docutils literal notranslate"><span class="pre">ImportError</span></code> when attempting to import the <code class="xref py py-mod docutils literal notranslate"><span class="pre">cl</span></code> module, which is only available on IRIX.</p> </div> <p>Audio files have a number of parameters that describe the audio data. The sampling rate or frame rate is the number of times per second the sound is sampled. The number of channels indicate if the audio is mono, stereo, or quadro. Each frame consists of one sample per channel. The sample size is the size in bytes of each sample. Thus a frame consists of <em>nchannels</em>*<em>samplesize</em> bytes, and a second’s worth of audio consists of <em>nchannels</em>*<em>samplesize</em>*<em>framerate</em> bytes.</p> <p>For example, CD quality audio has a sample size of two bytes (16 bits), uses two channels (stereo) and has a frame rate of 44,100 frames/second. This gives a frame size of 4 bytes (2*2), and a second’s worth occupies 2*2*44100 bytes (176,400 bytes).</p> <p>Module <a class="reference internal" href="#module-aifc" title="aifc: Read and write audio files in AIFF or AIFC format."><code class="xref py py-mod docutils literal notranslate"><span class="pre">aifc</span></code></a> defines the following function:</p> <dl class="py function"> <dt class="sig sig-object py" id="aifc.open"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">open</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">file</span></span></em><span class="optional">[</span>, <em class="sig-param"><span class="n"><span class="pre">mode</span></span></em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.open" title="Permalink to this definition">¶</a></dt> <dd><p>Open an AIFF or AIFF-C file and return an object instance with methods that are described below. The argument <em>file</em> is either a string naming a file or a file object. <em>mode</em> must be <code class="docutils literal notranslate"><span class="pre">'r'</span></code> or <code class="docutils literal notranslate"><span class="pre">'rb'</span></code> when the file must be opened for reading, or <code class="docutils literal notranslate"><span class="pre">'w'</span></code> or <code class="docutils literal notranslate"><span class="pre">'wb'</span></code> when the file must be opened for writing. If omitted, <code class="docutils literal notranslate"><span class="pre">file.mode</span></code> is used if it exists, otherwise <code class="docutils literal notranslate"><span class="pre">'rb'</span></code> is used. When used for writing, the file object should be seekable, unless you know ahead of time how many samples you are going to write in total and use <code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframesraw()</span></code> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">setnframes()</span></code>.</p> </dd></dl> <p>Objects returned by <a class="reference internal" href="#aifc.open" title="aifc.open"><code class="xref py py-func docutils literal notranslate"><span class="pre">open()</span></code></a> when a file is opened for reading have the following methods:</p> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getnchannels"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getnchannels</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getnchannels" title="Permalink to this definition">¶</a></dt> <dd><p>Return the number of audio channels (1 for mono, 2 for stereo).</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getsampwidth"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getsampwidth</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getsampwidth" title="Permalink to this definition">¶</a></dt> <dd><p>Return the size in bytes of individual samples.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getframerate"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getframerate</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getframerate" title="Permalink to this definition">¶</a></dt> <dd><p>Return the sampling rate (number of audio frames per second).</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getnframes"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getnframes</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getnframes" title="Permalink to this definition">¶</a></dt> <dd><p>Return the number of audio frames in the file.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getcomptype"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getcomptype</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getcomptype" title="Permalink to this definition">¶</a></dt> <dd><p>Return a four-character string describing the type of compression used in the audio file. For AIFF files, the returned value is <code class="docutils literal notranslate"><span class="pre">'NONE'</span></code>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getcompname"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getcompname</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getcompname" title="Permalink to this definition">¶</a></dt> <dd><p>Return a human-readable description of the type of compression used in the audio file. For AIFF files, the returned value is <code class="docutils literal notranslate"><span class="pre">'not</span> <span class="pre">compressed'</span></code>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getparams"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getparams</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getparams" title="Permalink to this definition">¶</a></dt> <dd><p>Return a tuple consisting of all of the above values in the above order.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getmarkers"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getmarkers</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getmarkers" title="Permalink to this definition">¶</a></dt> <dd><p>Return a list of markers in the audio file. A marker consists of a tuple of three elements. The first is the mark ID (an integer), the second is the mark position in frames from the beginning of the data (an integer), the third is the name of the mark (a string).</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.getmark"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">getmark</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">id</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.getmark" title="Permalink to this definition">¶</a></dt> <dd><p>Return the tuple as described in <a class="reference internal" href="#aifc.aifc.getmarkers" title="aifc.aifc.getmarkers"><code class="xref py py-meth docutils literal notranslate"><span class="pre">getmarkers()</span></code></a> for the mark with the given <em>id</em>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.readframes"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">readframes</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">nframes</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.readframes" title="Permalink to this definition">¶</a></dt> <dd><p>Read and return the next <em>nframes</em> frames from the audio file. The returned data is a string containing for each frame the uncompressed samples of all channels.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.rewind"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">rewind</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.rewind" title="Permalink to this definition">¶</a></dt> <dd><p>Rewind the read pointer. The next <a class="reference internal" href="#aifc.aifc.readframes" title="aifc.aifc.readframes"><code class="xref py py-meth docutils literal notranslate"><span class="pre">readframes()</span></code></a> will start from the beginning.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setpos"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setpos</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">pos</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setpos" title="Permalink to this definition">¶</a></dt> <dd><p>Seek to the specified frame number.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.tell"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">tell</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.tell" title="Permalink to this definition">¶</a></dt> <dd><p>Return the current frame number.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.close"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">close</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.close" title="Permalink to this definition">¶</a></dt> <dd><p>Close the AIFF file. After calling this method, the object can no longer be used.</p> </dd></dl> <p>Objects returned by <a class="reference internal" href="#aifc.open" title="aifc.open"><code class="xref py py-func docutils literal notranslate"><span class="pre">open()</span></code></a> when a file is opened for writing have all the above methods, except for <code class="xref py py-meth docutils literal notranslate"><span class="pre">readframes()</span></code> and <code class="xref py py-meth docutils literal notranslate"><span class="pre">setpos()</span></code>. In addition the following methods exist. The <code class="xref py py-meth docutils literal notranslate"><span class="pre">get*()</span></code> methods can only be called after the corresponding <code class="xref py py-meth docutils literal notranslate"><span class="pre">set*()</span></code> methods have been called. Before the first <code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframes()</span></code> or <code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframesraw()</span></code>, all parameters except for the number of frames must be filled in.</p> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.aiff"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">aiff</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.aiff" title="Permalink to this definition">¶</a></dt> <dd><p>Create an AIFF file. The default is that an AIFF-C file is created, unless the name of the file ends in <code class="docutils literal notranslate"><span class="pre">'.aiff'</span></code> in which case the default is an AIFF file.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.aifc"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">aifc</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.aifc" title="Permalink to this definition">¶</a></dt> <dd><p>Create an AIFF-C file. The default is that an AIFF-C file is created, unless the name of the file ends in <code class="docutils literal notranslate"><span class="pre">'.aiff'</span></code> in which case the default is an AIFF file.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setnchannels"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setnchannels</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">nchannels</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setnchannels" title="Permalink to this definition">¶</a></dt> <dd><p>Specify the number of channels in the audio file.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setsampwidth"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setsampwidth</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">width</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setsampwidth" title="Permalink to this definition">¶</a></dt> <dd><p>Specify the size in bytes of audio samples.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setframerate"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setframerate</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">rate</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setframerate" title="Permalink to this definition">¶</a></dt> <dd><p>Specify the sampling frequency in frames per second.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setnframes"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setnframes</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">nframes</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setnframes" title="Permalink to this definition">¶</a></dt> <dd><p>Specify the number of frames that are to be written to the audio file. If this parameter is not set, or not set correctly, the file needs to support seeking.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setcomptype"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setcomptype</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">type</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setcomptype" title="Permalink to this definition">¶</a></dt> <dd><p id="index-1">Specify the compression type. If not specified, the audio data will not be compressed. In AIFF files, compression is not possible. The name parameter should be a human-readable description of the compression type, the type parameter should be a four-character string. Currently the following compression types are supported: NONE, ULAW, ALAW, G722.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setparams"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setparams</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">nchannels</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">sampwidth</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">framerate</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">comptype</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">compname</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setparams" title="Permalink to this definition">¶</a></dt> <dd><p>Set all the above parameters at once. The argument is a tuple consisting of the various parameters. This means that it is possible to use the result of a <a class="reference internal" href="#aifc.aifc.getparams" title="aifc.aifc.getparams"><code class="xref py py-meth docutils literal notranslate"><span class="pre">getparams()</span></code></a> call as argument to <a class="reference internal" href="#aifc.aifc.setparams" title="aifc.aifc.setparams"><code class="xref py py-meth docutils literal notranslate"><span class="pre">setparams()</span></code></a>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.setmark"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">setmark</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">id</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">pos</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">name</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.setmark" title="Permalink to this definition">¶</a></dt> <dd><p>Add a mark with the given id (larger than 0), and the given name at the given position. This method can be called at any time before <a class="reference internal" href="#id1" title="aifc.aifc.close"><code class="xref py py-meth docutils literal notranslate"><span class="pre">close()</span></code></a>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="id0"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">tell</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#id0" title="Permalink to this definition">¶</a></dt> <dd><p>Return the current write position in the output file. Useful in combination with <a class="reference internal" href="#aifc.aifc.setmark" title="aifc.aifc.setmark"><code class="xref py py-meth docutils literal notranslate"><span class="pre">setmark()</span></code></a>.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.writeframes"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">writeframes</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.writeframes" title="Permalink to this definition">¶</a></dt> <dd><p>Write data to the output file. This method can only be called after the audio file parameters have been set.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="aifc.aifc.writeframesraw"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">writeframesraw</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">data</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#aifc.aifc.writeframesraw" title="Permalink to this definition">¶</a></dt> <dd><p>Like <a class="reference internal" href="#aifc.aifc.writeframes" title="aifc.aifc.writeframes"><code class="xref py py-meth docutils literal notranslate"><span class="pre">writeframes()</span></code></a>, except that the header of the audio file is not updated.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="id1"> <span class="sig-prename descclassname"><span class="pre">aifc.</span></span><span class="sig-name descname"><span class="pre">close</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#id1" title="Permalink to this definition">¶</a></dt> <dd><p>Close the AIFF file. The header of the file is updated to reflect the actual size of the audio data. 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