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sqlite3	Folder	-	0755	2026-07-16 05:15:30
test	Folder	-	0755	2026-07-16 05:15:30
tomllib	Folder	-	0755	2026-07-16 05:15:30
unittest	Folder	-	0755	2026-07-16 05:15:30
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EXTERNALLY-MANAGED	File	645 B	0644	2026-06-19 12:46:00
LICENSE.txt	File	13.61 KB	0644	2026-06-19 12:46:00
__future__.py	File	5.1 KB	0644	2026-06-19 12:46:00
__hello__.py	File	227 B	0644	2026-06-19 12:46:00
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fileinput.py	File	15.35 KB	0644	2026-06-19 12:46:00
fnmatch.py	File	5.86 KB	0644	2026-06-19 12:46:00
fractions.py	File	37.17 KB	0644	2026-06-19 12:46:00
ftplib.py	File	34.41 KB	0644	2026-06-19 12:46:00
functools.py	File	37.23 KB	0644	2026-06-19 12:46:00
genericpath.py	File	5.44 KB	0644	2026-06-19 12:46:00
getopt.py	File	7.31 KB	0644	2026-06-19 12:46:00
getpass.py	File	5.85 KB	0644	2026-06-19 12:46:00
gettext.py	File	21.24 KB	0644	2026-06-19 12:46:00
glob.py	File	8.53 KB	0644	2026-06-19 12:46:00
graphlib.py	File	9.43 KB	0644	2026-06-19 12:46:00
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hashlib.py	File	9.13 KB	0644	2026-06-19 12:46:00
heapq.py	File	22.48 KB	0644	2026-06-19 12:46:00
hmac.py	File	7.54 KB	0644	2026-06-19 12:46:00
imaplib.py	File	52.43 KB	0644	2026-06-19 12:46:00
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ipaddress.py	File	76.46 KB	0644	2026-06-19 12:46:00
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locale.py	File	76.72 KB	0644	2026-06-19 12:46:00
lzma.py	File	12.97 KB	0644	2026-06-19 12:46:00
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modulefinder.py	File	23.14 KB	0644	2026-06-19 12:46:00
netrc.py	File	6.76 KB	0644	2026-06-19 12:46:00
nntplib.py	File	40.12 KB	0644	2026-06-19 12:46:00
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nturl2path.py	File	2.82 KB	0644	2026-06-19 12:46:00
numbers.py	File	11.2 KB	0644	2026-06-19 12:46:00
opcode.py	File	12.87 KB	0644	2026-06-19 12:46:00
operator.py	File	10.71 KB	0644	2026-06-19 12:46:00
optparse.py	File	58.95 KB	0644	2026-06-19 12:46:00
os.py	File	38.85 KB	0644	2026-06-19 12:46:00
pathlib.py	File	49.95 KB	0644	2026-06-19 12:46:00
pdb.py	File	67.83 KB	0755	2026-07-16 05:15:22
pickle.py	File	63.38 KB	0644	2026-06-19 12:46:00
pickletools.py	File	91.66 KB	0644	2026-06-19 12:46:00
pipes.py	File	8.77 KB	0644	2026-06-19 12:46:00
pkgutil.py	File	17.85 KB	0644	2026-06-19 12:46:00
platform.py	File	42.32 KB	0755	2026-07-16 05:15:22
plistlib.py	File	27.91 KB	0644	2026-06-19 12:46:00
poplib.py	File	13.83 KB	0644	2026-06-19 12:46:00
posixpath.py	File	17.21 KB	0644	2026-06-19 12:46:00
pprint.py	File	23.59 KB	0644	2026-06-19 12:46:00
profile.py	File	22.55 KB	0755	2026-07-16 05:15:22
pstats.py	File	28.6 KB	0644	2026-06-19 12:46:00
pty.py	File	5.99 KB	0644	2026-06-19 12:46:00
py_compile.py	File	7.69 KB	0644	2026-06-19 12:46:00
pyclbr.py	File	11.13 KB	0644	2026-06-19 12:46:00
pydoc.py	File	110.44 KB	0755	2026-07-16 05:15:22
queue.py	File	11.23 KB	0644	2026-06-19 12:46:00
quopri.py	File	7.02 KB	0755	2026-07-16 05:15:22
random.py	File	33.87 KB	0644	2026-06-19 12:46:00
reprlib.py	File	6.42 KB	0644	2026-06-19 12:46:00
rlcompleter.py	File	7.64 KB	0644	2026-06-19 12:46:00
runpy.py	File	12.6 KB	0644	2026-06-19 12:46:00
sched.py	File	6.2 KB	0644	2026-06-19 12:46:00
secrets.py	File	1.94 KB	0644	2026-06-19 12:46:00
selectors.py	File	19.21 KB	0644	2026-06-19 12:46:00
shelve.py	File	8.36 KB	0644	2026-06-19 12:46:00
shlex.py	File	13.04 KB	0644	2026-06-19 12:46:00
shutil.py	File	56.76 KB	0644	2026-06-19 12:46:00
signal.py	File	2.44 KB	0644	2026-06-19 12:46:00
site.py	File	23.34 KB	0644	2026-06-19 12:46:00
smtplib.py	File	42.51 KB	0755	2026-07-16 05:15:22
sndhdr.py	File	7.27 KB	0644	2026-06-19 12:46:00
socket.py	File	36.53 KB	0644	2026-06-19 12:46:00
socketserver.py	File	27.2 KB	0644	2026-06-19 12:46:00
sre_compile.py	File	231 B	0644	2026-06-19 12:46:00
sre_constants.py	File	232 B	0644	2026-06-19 12:46:00
sre_parse.py	File	229 B	0644	2026-06-19 12:46:00
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statistics.py	File	49.05 KB	0644	2026-06-19 12:46:00
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struct.py	File	257 B	0644	2026-06-19 12:46:00
subprocess.py	File	86.65 KB	0644	2026-06-19 12:46:00
sunau.py	File	18.04 KB	0644	2026-06-19 12:46:00
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types.py	File	10.74 KB	0644	2026-06-19 12:46:00
typing.py	File	114.68 KB	0644	2026-06-19 12:46:00
uu.py	File	7.19 KB	0755	2026-07-16 05:15:22
uuid.py	File	28.96 KB	0644	2026-06-19 12:46:00
warnings.py	File	21.25 KB	0644	2026-06-19 12:46:00
wave.py	File	22.24 KB	0644	2026-06-19 12:46:00
weakref.py	File	21.01 KB	0644	2026-06-19 12:46:00
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zipimport.py	File	27.47 KB	0644	2026-06-19 12:46:00

"""Routines to help recognizing sound files.

Function whathdr() recognizes various types of sound file headers.
It understands almost all headers that SOX can decode.

The return tuple contains the following items, in this order:
- file type (as SOX understands it)
- sampling rate (0 if unknown or hard to decode)
- number of channels (0 if unknown or hard to decode)
- number of frames in the file (-1 if unknown or hard to decode)
- number of bits/sample, or 'U' for U-LAW, or 'A' for A-LAW

If the file doesn't have a recognizable type, it returns None.
If the file can't be opened, OSError is raised.

To compute the total time, divide the number of frames by the
sampling rate (a frame contains a sample for each channel).

Function what() calls whathdr().  (It used to also use some
heuristics for raw data, but this doesn't work very well.)

Finally, the function test() is a simple main program that calls
what() for all files mentioned on the argument list.  For directory
arguments it calls what() for all files in that directory.  Default
argument is "." (testing all files in the current directory).  The
option -r tells it to recurse down directories found inside
explicitly given directories.
"""

import warnings

warnings._deprecated(__name__, remove=(3, 13))

# The file structure is top-down except that the test program and its
# subroutine come last.

__all__ = ['what', 'whathdr']

from collections import namedtuple

SndHeaders = namedtuple('SndHeaders',
                        'filetype framerate nchannels nframes sampwidth')

SndHeaders.filetype.__doc__ = ("""The value for type indicates the data type
and will be one of the strings 'aifc', 'aiff', 'au','hcom',
'sndr', 'sndt', 'voc', 'wav', '8svx', 'sb', 'ub', or 'ul'.""")
SndHeaders.framerate.__doc__ = ("""The sampling_rate will be either the actual
value or 0 if unknown or difficult to decode.""")
SndHeaders.nchannels.__doc__ = ("""The number of channels or 0 if it cannot be
determined or if the value is difficult to decode.""")
SndHeaders.nframes.__doc__ = ("""The value for frames will be either the number
of frames or -1.""")
SndHeaders.sampwidth.__doc__ = ("""Either the sample size in bits or
'A' for A-LAW or 'U' for u-LAW.""")

def what(filename):
    """Guess the type of a sound file."""
    res = whathdr(filename)
    return res

def whathdr(filename):
    """Recognize sound headers."""
    with open(filename, 'rb') as f:
        h = f.read(512)
        for tf in tests:
            res = tf(h, f)
            if res:
                return SndHeaders(*res)
        return None

#-----------------------------------#
# Subroutines per sound header type #
#-----------------------------------#

tests = []

def test_aifc(h, f):
    """AIFC and AIFF files"""
    with warnings.catch_warnings():
        warnings.simplefilter('ignore', category=DeprecationWarning)
        import aifc
    if not h.startswith(b'FORM'):
        return None
    if h[8:12] == b'AIFC':
        fmt = 'aifc'
    elif h[8:12] == b'AIFF':
        fmt = 'aiff'
    else:
        return None
    f.seek(0)
    try:
        a = aifc.open(f, 'r')
    except (EOFError, aifc.Error):
        return None
    return (fmt, a.getframerate(), a.getnchannels(),
            a.getnframes(), 8 * a.getsampwidth())

tests.append(test_aifc)

def test_au(h, f):
    """AU and SND files"""
    if h.startswith(b'.snd'):
        func = get_long_be
    elif h[:4] in (b'\0ds.', b'dns.'):
        func = get_long_le
    else:
        return None
    filetype = 'au'
    hdr_size = func(h[4:8])
    data_size = func(h[8:12])
    encoding = func(h[12:16])
    rate = func(h[16:20])
    nchannels = func(h[20:24])
    sample_size = 1 # default
    if encoding == 1:
        sample_bits = 'U'
    elif encoding == 2:
        sample_bits = 8
    elif encoding == 3:
        sample_bits = 16
        sample_size = 2
    else:
        sample_bits = '?'
    frame_size = sample_size * nchannels
    if frame_size:
        nframe = data_size / frame_size
    else:
        nframe = -1
    return filetype, rate, nchannels, nframe, sample_bits

tests.append(test_au)

def test_hcom(h, f):
    """HCOM file"""
    if h[65:69] != b'FSSD' or h[128:132] != b'HCOM':
        return None
    divisor = get_long_be(h[144:148])
    if divisor:
        rate = 22050 / divisor
    else:
        rate = 0
    return 'hcom', rate, 1, -1, 8

tests.append(test_hcom)

def test_voc(h, f):
    """VOC file"""
    if not h.startswith(b'Creative Voice File\032'):
        return None
    sbseek = get_short_le(h[20:22])
    rate = 0
    if 0 <= sbseek < 500 and h[sbseek] == 1:
        ratecode = 256 - h[sbseek+4]
        if ratecode:
            rate = int(1000000.0 / ratecode)
    return 'voc', rate, 1, -1, 8

tests.append(test_voc)

def test_wav(h, f):
    """WAV file"""
    import wave
    # 'RIFF' <len> 'WAVE' 'fmt ' <len>
    if not h.startswith(b'RIFF') or h[8:12] != b'WAVE' or h[12:16] != b'fmt ':
        return None
    f.seek(0)
    try:
        w = wave.open(f, 'r')
    except (EOFError, wave.Error):
        return None
    return ('wav', w.getframerate(), w.getnchannels(),
                   w.getnframes(), 8*w.getsampwidth())

tests.append(test_wav)

def test_8svx(h, f):
    """8SVX file"""
    if not h.startswith(b'FORM') or h[8:12] != b'8SVX':
        return None
    # Should decode it to get #channels -- assume always 1
    return '8svx', 0, 1, 0, 8

tests.append(test_8svx)

def test_sndt(h, f):
    """SNDT file"""
    if h.startswith(b'SOUND'):
        nsamples = get_long_le(h[8:12])
        rate = get_short_le(h[20:22])
        return 'sndt', rate, 1, nsamples, 8

tests.append(test_sndt)

def test_sndr(h, f):
    """SNDR file"""
    if h.startswith(b'\0\0'):
        rate = get_short_le(h[2:4])
        if 4000 <= rate <= 25000:
            return 'sndr', rate, 1, -1, 8

tests.append(test_sndr)

#-------------------------------------------#
# Subroutines to extract numbers from bytes #
#-------------------------------------------#

def get_long_be(b):
    return (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3]

def get_long_le(b):
    return (b[3] << 24) | (b[2] << 16) | (b[1] << 8) | b[0]

def get_short_be(b):
    return (b[0] << 8) | b[1]

def get_short_le(b):
    return (b[1] << 8) | b[0]

#--------------------#
# Small test program #
#--------------------#

def test():
    import sys
    recursive = 0
    if sys.argv[1:] and sys.argv[1] == '-r':
        del sys.argv[1:2]
        recursive = 1
    try:
        if sys.argv[1:]:
            testall(sys.argv[1:], recursive, 1)
        else:
            testall(['.'], recursive, 1)
    except KeyboardInterrupt:
        sys.stderr.write('\n[Interrupted]\n')
        sys.exit(1)

def testall(list, recursive, toplevel):
    import sys
    import os
    for filename in list:
        if os.path.isdir(filename):
            print(filename + '/:', end=' ')
            if recursive or toplevel:
                print('recursing down:')
                import glob
                names = glob.glob(os.path.join(glob.escape(filename), '*'))
                testall(names, recursive, 0)
            else:
                print('*** directory (use -r) ***')
        else:
            print(filename + ':', end=' ')
            sys.stdout.flush()
            try:
                print(what(filename))
            except OSError:
                print('*** not found ***')

if __name__ == '__main__':
    test()

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