FM / python3.12

/usr/lib64/python3.12

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
config-3.12-x86_64-linux-gnu/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
ensurepip/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
re/	-	0755	rm
site-packages/	-	0755	rm
sqlite3/	-	0755	rm
tomllib/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
zipfile/	-	0755	rm
zoneinfo/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	6538	0644	edit dl rm
aifc.py	34211	0644	edit dl rm
antigravity.py	500	0644	edit dl rm
argparse.py	101155	0644	edit dl rm
ast.py	64452	0644	edit dl rm
base64.py	20634	0755	edit dl rm
bdb.py	33573	0644	edit dl rm
bisect.py	3423	0644	edit dl rm
bz2.py	11847	0644	edit dl rm
calendar.py	25864	0644	edit dl rm
cgi.py	34418	0755	edit dl rm
cgitb.py	12421	0644	edit dl rm
chunk.py	5500	0644	edit dl rm
cmd.py	14873	0644	edit dl rm
code.py	10962	0644	edit dl rm
codecs.py	36870	0644	edit dl rm
codeop.py	5908	0644	edit dl rm
colorsys.py	4062	0644	edit dl rm
compileall.py	20507	0644	edit dl rm
configparser.py	54205	0644	edit dl rm
contextlib.py	27637	0644	edit dl rm
contextvars.py	129	0644	edit dl rm
copy.py	8412	0644	edit dl rm
copyreg.py	7614	0644	edit dl rm
cProfile.py	6555	0755	edit dl rm
crypt.py	3913	0644	edit dl rm
csv.py	17132	0644	edit dl rm
dataclasses.py	62085	0644	edit dl rm
datetime.py	268	0644	edit dl rm
decimal.py	2805	0644	edit dl rm
difflib.py	83368	0644	edit dl rm
dis.py	30227	0644	edit dl rm
doctest.py	106749	0644	edit dl rm
enum.py	81540	0644	edit dl rm
filecmp.py	10381	0644	edit dl rm
fileinput.py	15714	0644	edit dl rm
fnmatch.py	5999	0644	edit dl rm
fractions.py	38147	0644	edit dl rm
ftplib.py	35240	0644	edit dl rm
functools.py	37940	0644	edit dl rm
genericpath.py	5572	0644	edit dl rm
getopt.py	7488	0644	edit dl rm
getpass.py	5990	0644	edit dl rm
gettext.py	21320	0644	edit dl rm
glob.py	8732	0644	edit dl rm
graphlib.py	9648	0644	edit dl rm
gzip.py	25402	0644	edit dl rm
hashlib.py	9683	0644	edit dl rm
heapq.py	23024	0644	edit dl rm
hmac.py	8043	0644	edit dl rm
imaplib.py	54209	0644	edit dl rm
imghdr.py	4398	0644	edit dl rm
inspect.py	127125	0644	edit dl rm
io.py	3582	0644	edit dl rm
ipaddress.py	81414	0644	edit dl rm
keyword.py	1073	0644	edit dl rm
LICENSE.txt	13936	0644	edit dl rm
linecache.py	5800	0644	edit dl rm
locale.py	78599	0644	edit dl rm
lzma.py	13277	0644	edit dl rm
mailbox.py	78911	0644	edit dl rm
mailcap.py	9333	0644	edit dl rm
mimetypes.py	23037	0644	edit dl rm
modulefinder.py	23699	0644	edit dl rm
netrc.py	6922	0644	edit dl rm
nntplib.py	41087	0644	edit dl rm
ntpath.py	30404	0644	edit dl rm
nturl2path.py	2374	0644	edit dl rm
numbers.py	11467	0644	edit dl rm
opcode.py	13174	0644	edit dl rm
operator.py	10965	0644	edit dl rm
optparse.py	60369	0644	edit dl rm
os.py	40821	0644	edit dl rm
pathlib.py	51052	0644	edit dl rm
pdb.py	70297	0755	edit dl rm
pickle.py	66911	0644	edit dl rm
pickletools.py	94052	0644	edit dl rm
pipes.py	8978	0644	edit dl rm
pkgutil.py	18281	0644	edit dl rm
platform.py	43388	0755	edit dl rm
plistlib.py	28582	0644	edit dl rm
poplib.py	14742	0644	edit dl rm
posixpath.py	17356	0644	edit dl rm
pprint.py	24158	0644	edit dl rm
profile.py	23092	0755	edit dl rm
pstats.py	29289	0644	edit dl rm
pty.py	6137	0644	edit dl rm
pyclbr.py	11396	0644	edit dl rm
pydoc.py	113508	0755	edit dl rm
py_compile.py	7837	0644	edit dl rm
queue.py	11496	0644	edit dl rm
quopri.py	7183	0755	edit dl rm
random.py	34689	0644	edit dl rm
reprlib.py	7148	0644	edit dl rm
rlcompleter.py	7827	0644	edit dl rm
runpy.py	12885	0644	edit dl rm
sched.py	6351	0644	edit dl rm
secrets.py	1984	0644	edit dl rm
selectors.py	19671	0644	edit dl rm
shelve.py	8560	0644	edit dl rm
shlex.py	13353	0644	edit dl rm
shutil.py	56198	0644	edit dl rm
signal.py	2495	0644	edit dl rm
site.py	23439	0644	edit dl rm
smtplib.py	43531	0755	edit dl rm
sndhdr.py	7448	0644	edit dl rm
socket.py	37815	0644	edit dl rm
socketserver.py	28065	0644	edit dl rm
sre_compile.py	231	0644	edit dl rm
sre_constants.py	232	0644	edit dl rm
sre_parse.py	229	0644	edit dl rm
ssl.py	50904	0644	edit dl rm
stat.py	5485	0644	edit dl rm
statistics.py	50227	0644	edit dl rm
string.py	11786	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	88747	0644	edit dl rm
sunau.py	18478	0644	edit dl rm
symtable.py	12477	0644	edit dl rm
sysconfig.py	33773	0644	edit dl rm
tabnanny.py	11531	0755	edit dl rm
tarfile.py	115805	0755	edit dl rm
telnetlib.py	23334	0644	edit dl rm
tempfile.py	32386	0644	edit dl rm
textwrap.py	19718	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	59742	0644	edit dl rm
timeit.py	13463	0755	edit dl rm
token.py	2511	0644	edit dl rm
tokenize.py	21570	0644	edit dl rm
trace.py	29352	0755	edit dl rm
traceback.py	46393	0644	edit dl rm
tracemalloc.py	18047	0644	edit dl rm
tty.py	2035	0644	edit dl rm
types.py	10993	0644	edit dl rm
typing.py	118836	0644	edit dl rm
uu.py	7341	0644	edit dl rm
uuid.py	29656	0644	edit dl rm
warnings.py	21909	0644	edit dl rm
wave.py	22769	0644	edit dl rm
weakref.py	21513	0644	edit dl rm
webbrowser.py	24206	0755	edit dl rm
xdrlib.py	5942	0644	edit dl rm
zipapp.py	7543	0644	edit dl rm
zipimport.py	27840	0644	edit dl rm
_aix_support.py	4021	0644	edit dl rm
_collections_abc.py	32089	0644	edit dl rm
_compat_pickle.py	8761	0644	edit dl rm
_compression.py	5681	0644	edit dl rm
_markupbase.py	14653	0644	edit dl rm
_osx_support.py	22023	0644	edit dl rm
_pydatetime.py	92087	0644	edit dl rm
_pydecimal.py	227283	0644	edit dl rm
_pyio.py	93593	0644	edit dl rm
_pylong.py	10790	0644	edit dl rm
_py_abc.py	6189	0644	edit dl rm
_sitebuiltins.py	3128	0644	edit dl rm
_strptime.py	28393	0644	edit dl rm
_sysconfigdata__linux_x86_64-linux-gnu.py	72132	0644	edit dl rm
_threading_local.py	7220	0644	edit dl rm
_weakrefset.py	5893	0644	edit dl rm
__future__.py	5218	0644	edit dl rm
__hello__.py	227	0644	edit dl rm

Edit: /usr/lib64/python3.12/aifc.py (34211B)

"""Stuff to parse AIFF-C and AIFF files.

Unless explicitly stated otherwise, the description below is true
both for AIFF-C files and AIFF files.

An AIFF-C file has the following structure.

+-----------------+
  | FORM            |
  +-----------------+
  | <size>          |
  +----+------------+
  |    | AIFC       |
  |    +------------+
  |    | <chunks>   |
  |    |    .       |
  |    |    .       |
  |    |    .       |
  +----+------------+

An AIFF file has the string "AIFF" instead of "AIFC".

A chunk consists of an identifier (4 bytes) followed by a size (4 bytes,
big endian order), followed by the data.  The size field does not include
the size of the 8 byte header.

The following chunk types are recognized.

FVER
      <version number of AIFF-C defining document> (AIFF-C only).
  MARK
      <# of markers> (2 bytes)
      list of markers:
          <marker ID> (2 bytes, must be > 0)
          <position> (4 bytes)
          <marker name> ("pstring")
  COMM
      <# of channels> (2 bytes)
      <# of sound frames> (4 bytes)
      <size of the samples> (2 bytes)
      <sampling frequency> (10 bytes, IEEE 80-bit extended
          floating point)
      in AIFF-C files only:
      <compression type> (4 bytes)
      <human-readable version of compression type> ("pstring")
  SSND
      <offset> (4 bytes, not used by this program)
      <blocksize> (4 bytes, not used by this program)
      <sound data>

A pstring consists of 1 byte length, a string of characters, and 0 or 1
byte pad to make the total length even.

Usage.

Reading AIFF files:
  f = aifc.open(file, 'r')
where file is either the name of a file or an open file pointer.
The open file pointer must have methods read(), seek(), and close().
In some types of audio files, if the setpos() method is not used,
the seek() method is not necessary.

This returns an instance of a class with the following public methods:
  getnchannels()  -- returns number of audio channels (1 for
             mono, 2 for stereo)
  getsampwidth()  -- returns sample width in bytes
  getframerate()  -- returns sampling frequency
  getnframes()    -- returns number of audio frames
  getcomptype()   -- returns compression type ('NONE' for AIFF files)
  getcompname()   -- returns human-readable version of
             compression type ('not compressed' for AIFF files)
  getparams() -- returns a namedtuple consisting of all of the
             above in the above order
  getmarkers()    -- get the list of marks in the audio file or None
             if there are no marks
  getmark(id) -- get mark with the specified id (raises an error
             if the mark does not exist)
  readframes(n)   -- returns at most n frames of audio
  rewind()    -- rewind to the beginning of the audio stream
  setpos(pos) -- seek to the specified position
  tell()      -- return the current position
  close()     -- close the instance (make it unusable)
The position returned by tell(), the position given to setpos() and
the position of marks are all compatible and have nothing to do with
the actual position in the file.
The close() method is called automatically when the class instance
is destroyed.

Writing AIFF files:
  f = aifc.open(file, 'w')
where file is either the name of a file or an open file pointer.
The open file pointer must have methods write(), tell(), seek(), and
close().

This returns an instance of a class with the following public methods:
  aiff()      -- create an AIFF file (AIFF-C default)
  aifc()      -- create an AIFF-C file
  setnchannels(n) -- set the number of channels
  setsampwidth(n) -- set the sample width
  setframerate(n) -- set the frame rate
  setnframes(n)   -- set the number of frames
  setcomptype(type, name)
          -- set the compression type and the
             human-readable compression type
  setparams(tuple)
          -- set all parameters at once
  setmark(id, pos, name)
          -- add specified mark to the list of marks
  tell()      -- return current position in output file (useful
             in combination with setmark())
  writeframesraw(data)
          -- write audio frames without pathing up the
             file header
  writeframes(data)
          -- write audio frames and patch up the file header
  close()     -- patch up the file header and close the
             output file
You should set the parameters before the first writeframesraw or
writeframes.  The total number of frames does not need to be set,
but when it is set to the correct value, the header does not have to
be patched up.
It is best to first set all parameters, perhaps possibly the
compression type, and then write audio frames using writeframesraw.
When all frames have been written, either call writeframes(b'') or
close() to patch up the sizes in the header.
Marks can be added anytime.  If there are any marks, you must call
close() after all frames have been written.
The close() method is called automatically when the class instance
is destroyed.

When a file is opened with the extension '.aiff', an AIFF file is
written, otherwise an AIFF-C file is written.  This default can be
changed by calling aiff() or aifc() before the first writeframes or
writeframesraw.
"""

import struct
import builtins
import warnings

__all__ = ["Error", "open"]

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

class Error(Exception):
    pass

_AIFC_version = 0xA2805140     # Version 1 of AIFF-C

def _read_long(file):
    try:
        return struct.unpack('>l', file.read(4))[0]
    except struct.error:
        raise EOFError from None

def _read_ulong(file):
    try:
        return struct.unpack('>L', file.read(4))[0]
    except struct.error:
        raise EOFError from None

def _read_short(file):
    try:
        return struct.unpack('>h', file.read(2))[0]
    except struct.error:
        raise EOFError from None

def _read_ushort(file):
    try:
        return struct.unpack('>H', file.read(2))[0]
    except struct.error:
        raise EOFError from None

def _read_string(file):
    length = ord(file.read(1))
    if length == 0:
        data = b''
    else:
        data = file.read(length)
    if length & 1 == 0:
        dummy = file.read(1)
    return data

_HUGE_VAL = 1.79769313486231e+308 # See <limits.h>

def _read_float(f): # 10 bytes
    expon = _read_short(f) # 2 bytes
    sign = 1
    if expon < 0:
        sign = -1
        expon = expon + 0x8000
    himant = _read_ulong(f) # 4 bytes
    lomant = _read_ulong(f) # 4 bytes
    if expon == himant == lomant == 0:
        f = 0.0
    elif expon == 0x7FFF:
        f = _HUGE_VAL
    else:
        expon = expon - 16383
        f = (himant * 0x100000000 + lomant) * pow(2.0, expon - 63)
    return sign * f

def _write_short(f, x):
    f.write(struct.pack('>h', x))

def _write_ushort(f, x):
    f.write(struct.pack('>H', x))

def _write_long(f, x):
    f.write(struct.pack('>l', x))

def _write_ulong(f, x):
    f.write(struct.pack('>L', x))

def _write_string(f, s):
    if len(s) > 255:
        raise ValueError("string exceeds maximum pstring length")
    f.write(struct.pack('B', len(s)))
    f.write(s)
    if len(s) & 1 == 0:
        f.write(b'\x00')

def _write_float(f, x):
    import math
    if x < 0:
        sign = 0x8000
        x = x * -1
    else:
        sign = 0
    if x == 0:
        expon = 0
        himant = 0
        lomant = 0
    else:
        fmant, expon = math.frexp(x)
        if expon > 16384 or fmant >= 1 or fmant != fmant: # Infinity or NaN
            expon = sign|0x7FFF
            himant = 0
            lomant = 0
        else:                   # Finite
            expon = expon + 16382
            if expon < 0:           # denormalized
                fmant = math.ldexp(fmant, expon)
                expon = 0
            expon = expon | sign
            fmant = math.ldexp(fmant, 32)
            fsmant = math.floor(fmant)
            himant = int(fsmant)
            fmant = math.ldexp(fmant - fsmant, 32)
            fsmant = math.floor(fmant)
            lomant = int(fsmant)
    _write_ushort(f, expon)
    _write_ulong(f, himant)
    _write_ulong(f, lomant)

with warnings.catch_warnings():
    warnings.simplefilter("ignore", DeprecationWarning)
    from chunk import Chunk
from collections import namedtuple

_aifc_params = namedtuple('_aifc_params',
                          'nchannels sampwidth framerate nframes comptype compname')

_aifc_params.nchannels.__doc__ = 'Number of audio channels (1 for mono, 2 for stereo)'
_aifc_params.sampwidth.__doc__ = 'Sample width in bytes'
_aifc_params.framerate.__doc__ = 'Sampling frequency'
_aifc_params.nframes.__doc__ = 'Number of audio frames'
_aifc_params.comptype.__doc__ = 'Compression type ("NONE" for AIFF files)'
_aifc_params.compname.__doc__ = ("""\
A human-readable version of the compression type
('not compressed' for AIFF files)""")

class Aifc_read:
    # Variables used in this class:
    #
    # These variables are available to the user though appropriate
    # methods of this class:
    # _file -- the open file with methods read(), close(), and seek()
    #       set through the __init__() method
    # _nchannels -- the number of audio channels
    #       available through the getnchannels() method
    # _nframes -- the number of audio frames
    #       available through the getnframes() method
    # _sampwidth -- the number of bytes per audio sample
    #       available through the getsampwidth() method
    # _framerate -- the sampling frequency
    #       available through the getframerate() method
    # _comptype -- the AIFF-C compression type ('NONE' if AIFF)
    #       available through the getcomptype() method
    # _compname -- the human-readable AIFF-C compression type
    #       available through the getcomptype() method
    # _markers -- the marks in the audio file
    #       available through the getmarkers() and getmark()
    #       methods
    # _soundpos -- the position in the audio stream
    #       available through the tell() method, set through the
    #       setpos() method
    #
    # These variables are used internally only:
    # _version -- the AIFF-C version number
    # _decomp -- the decompressor from builtin module cl
    # _comm_chunk_read -- 1 iff the COMM chunk has been read
    # _aifc -- 1 iff reading an AIFF-C file
    # _ssnd_seek_needed -- 1 iff positioned correctly in audio
    #       file for readframes()
    # _ssnd_chunk -- instantiation of a chunk class for the SSND chunk
    # _framesize -- size of one frame in the file

_file = None  # Set here since __del__ checks it

def initfp(self, file):
        self._version = 0
        self._convert = None
        self._markers = []
        self._soundpos = 0
        self._file = file
        chunk = Chunk(file)
        if chunk.getname() != b'FORM':
            raise Error('file does not start with FORM id')
        formdata = chunk.read(4)
        if formdata == b'AIFF':
            self._aifc = 0
        elif formdata == b'AIFC':
            self._aifc = 1
        else:
            raise Error('not an AIFF or AIFF-C file')
        self._comm_chunk_read = 0
        self._ssnd_chunk = None
        while 1:
            self._ssnd_seek_needed = 1
            try:
                chunk = Chunk(self._file)
            except EOFError:
                break
            chunkname = chunk.getname()
            if chunkname == b'COMM':
                self._read_comm_chunk(chunk)
                self._comm_chunk_read = 1
            elif chunkname == b'SSND':
                self._ssnd_chunk = chunk
                dummy = chunk.read(8)
                self._ssnd_seek_needed = 0
            elif chunkname == b'FVER':
                self._version = _read_ulong(chunk)
            elif chunkname == b'MARK':
                self._readmark(chunk)
            chunk.skip()
        if not self._comm_chunk_read or not self._ssnd_chunk:
            raise Error('COMM chunk and/or SSND chunk missing')

def __init__(self, f):
        if isinstance(f, str):
            file_object = builtins.open(f, 'rb')
            try:
                self.initfp(file_object)
            except:
                file_object.close()
                raise
        else:
            # assume it is an open file object already
            self.initfp(f)

def __enter__(self):
        return self

def __exit__(self, *args):
        self.close()

#
    # User visible methods.
    #
    def getfp(self):
        return self._file

def rewind(self):
        self._ssnd_seek_needed = 1
        self._soundpos = 0

def close(self):
        file = self._file
        if file is not None:
            self._file = None
            file.close()

def tell(self):
        return self._soundpos

def getnchannels(self):
        return self._nchannels

def getnframes(self):
        return self._nframes

def getsampwidth(self):
        return self._sampwidth

def getframerate(self):
        return self._framerate

def getcomptype(self):
        return self._comptype

def getcompname(self):
        return self._compname

##  def getversion(self):
##      return self._version

def getparams(self):
        return _aifc_params(self.getnchannels(), self.getsampwidth(),
                            self.getframerate(), self.getnframes(),
                            self.getcomptype(), self.getcompname())

def getmarkers(self):
        if len(self._markers) == 0:
            return None
        return self._markers

def getmark(self, id):
        for marker in self._markers:
            if id == marker[0]:
                return marker
        raise Error('marker {0!r} does not exist'.format(id))

def setpos(self, pos):
        if pos < 0 or pos > self._nframes:
            raise Error('position not in range')
        self._soundpos = pos
        self._ssnd_seek_needed = 1

def readframes(self, nframes):
        if self._ssnd_seek_needed:
            self._ssnd_chunk.seek(0)
            dummy = self._ssnd_chunk.read(8)
            pos = self._soundpos * self._framesize
            if pos:
                self._ssnd_chunk.seek(pos + 8)
            self._ssnd_seek_needed = 0
        if nframes == 0:
            return b''
        data = self._ssnd_chunk.read(nframes * self._framesize)
        if self._convert and data:
            data = self._convert(data)
        self._soundpos = self._soundpos + len(data) // (self._nchannels
                                                        * self._sampwidth)
        return data

#
    # Internal methods.
    #

def _alaw2lin(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        return audioop.alaw2lin(data, 2)

def _ulaw2lin(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        return audioop.ulaw2lin(data, 2)

def _adpcm2lin(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        if not hasattr(self, '_adpcmstate'):
            # first time
            self._adpcmstate = None
        data, self._adpcmstate = audioop.adpcm2lin(data, 2, self._adpcmstate)
        return data

def _sowt2lin(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        return audioop.byteswap(data, 2)

def _read_comm_chunk(self, chunk):
        self._nchannels = _read_short(chunk)
        self._nframes = _read_long(chunk)
        self._sampwidth = (_read_short(chunk) + 7) // 8
        self._framerate = int(_read_float(chunk))
        if self._sampwidth <= 0:
            raise Error('bad sample width')
        if self._nchannels <= 0:
            raise Error('bad # of channels')
        self._framesize = self._nchannels * self._sampwidth
        if self._aifc:
            #DEBUG: SGI's soundeditor produces a bad size :-(
            kludge = 0
            if chunk.chunksize == 18:
                kludge = 1
                warnings.warn('Warning: bad COMM chunk size')
                chunk.chunksize = 23
            #DEBUG end
            self._comptype = chunk.read(4)
            #DEBUG start
            if kludge:
                length = ord(chunk.file.read(1))
                if length & 1 == 0:
                    length = length + 1
                chunk.chunksize = chunk.chunksize + length
                chunk.file.seek(-1, 1)
            #DEBUG end
            self._compname = _read_string(chunk)
            if self._comptype != b'NONE':
                if self._comptype == b'G722':
                    self._convert = self._adpcm2lin
                elif self._comptype in (b'ulaw', b'ULAW'):
                    self._convert = self._ulaw2lin
                elif self._comptype in (b'alaw', b'ALAW'):
                    self._convert = self._alaw2lin
                elif self._comptype in (b'sowt', b'SOWT'):
                    self._convert = self._sowt2lin
                else:
                    raise Error('unsupported compression type')
                self._sampwidth = 2
        else:
            self._comptype = b'NONE'
            self._compname = b'not compressed'

def _readmark(self, chunk):
        nmarkers = _read_short(chunk)
        # Some files appear to contain invalid counts.
        # Cope with this by testing for EOF.
        try:
            for i in range(nmarkers):
                id = _read_short(chunk)
                pos = _read_long(chunk)
                name = _read_string(chunk)
                if pos or name:
                    # some files appear to have
                    # dummy markers consisting of
                    # a position 0 and name ''
                    self._markers.append((id, pos, name))
        except EOFError:
            w = ('Warning: MARK chunk contains only %s marker%s instead of %s' %
                 (len(self._markers), '' if len(self._markers) == 1 else 's',
                  nmarkers))
            warnings.warn(w)

class Aifc_write:
    # Variables used in this class:
    #
    # These variables are user settable through appropriate methods
    # of this class:
    # _file -- the open file with methods write(), close(), tell(), seek()
    #       set through the __init__() method
    # _comptype -- the AIFF-C compression type ('NONE' in AIFF)
    #       set through the setcomptype() or setparams() method
    # _compname -- the human-readable AIFF-C compression type
    #       set through the setcomptype() or setparams() method
    # _nchannels -- the number of audio channels
    #       set through the setnchannels() or setparams() method
    # _sampwidth -- the number of bytes per audio sample
    #       set through the setsampwidth() or setparams() method
    # _framerate -- the sampling frequency
    #       set through the setframerate() or setparams() method
    # _nframes -- the number of audio frames written to the header
    #       set through the setnframes() or setparams() method
    # _aifc -- whether we're writing an AIFF-C file or an AIFF file
    #       set through the aifc() method, reset through the
    #       aiff() method
    #
    # These variables are used internally only:
    # _version -- the AIFF-C version number
    # _comp -- the compressor from builtin module cl
    # _nframeswritten -- the number of audio frames actually written
    # _datalength -- the size of the audio samples written to the header
    # _datawritten -- the size of the audio samples actually written

_file = None  # Set here since __del__ checks it

def __init__(self, f):
        if isinstance(f, str):
            file_object = builtins.open(f, 'wb')
            try:
                self.initfp(file_object)
            except:
                file_object.close()
                raise

# treat .aiff file extensions as non-compressed audio
            if f.endswith('.aiff'):
                self._aifc = 0
        else:
            # assume it is an open file object already
            self.initfp(f)

def initfp(self, file):
        self._file = file
        self._version = _AIFC_version
        self._comptype = b'NONE'
        self._compname = b'not compressed'
        self._convert = None
        self._nchannels = 0
        self._sampwidth = 0
        self._framerate = 0
        self._nframes = 0
        self._nframeswritten = 0
        self._datawritten = 0
        self._datalength = 0
        self._markers = []
        self._marklength = 0
        self._aifc = 1      # AIFF-C is default

def __del__(self):
        self.close()

def __enter__(self):
        return self

def __exit__(self, *args):
        self.close()

#
    # User visible methods.
    #
    def aiff(self):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        self._aifc = 0

def aifc(self):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        self._aifc = 1

def setnchannels(self, nchannels):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        if nchannels < 1:
            raise Error('bad # of channels')
        self._nchannels = nchannels

def getnchannels(self):
        if not self._nchannels:
            raise Error('number of channels not set')
        return self._nchannels

def setsampwidth(self, sampwidth):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        if sampwidth < 1 or sampwidth > 4:
            raise Error('bad sample width')
        self._sampwidth = sampwidth

def getsampwidth(self):
        if not self._sampwidth:
            raise Error('sample width not set')
        return self._sampwidth

def setframerate(self, framerate):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        if framerate <= 0:
            raise Error('bad frame rate')
        self._framerate = framerate

def getframerate(self):
        if not self._framerate:
            raise Error('frame rate not set')
        return self._framerate

def setnframes(self, nframes):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        self._nframes = nframes

def getnframes(self):
        return self._nframeswritten

def setcomptype(self, comptype, compname):
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        if comptype not in (b'NONE', b'ulaw', b'ULAW',
                            b'alaw', b'ALAW', b'G722', b'sowt', b'SOWT'):
            raise Error('unsupported compression type')
        self._comptype = comptype
        self._compname = compname

def getcomptype(self):
        return self._comptype

def getcompname(self):
        return self._compname

##  def setversion(self, version):
##      if self._nframeswritten:
##          raise Error, 'cannot change parameters after starting to write'
##      self._version = version

def setparams(self, params):
        nchannels, sampwidth, framerate, nframes, comptype, compname = params
        if self._nframeswritten:
            raise Error('cannot change parameters after starting to write')
        if comptype not in (b'NONE', b'ulaw', b'ULAW',
                            b'alaw', b'ALAW', b'G722', b'sowt', b'SOWT'):
            raise Error('unsupported compression type')
        self.setnchannels(nchannels)
        self.setsampwidth(sampwidth)
        self.setframerate(framerate)
        self.setnframes(nframes)
        self.setcomptype(comptype, compname)

def getparams(self):
        if not self._nchannels or not self._sampwidth or not self._framerate:
            raise Error('not all parameters set')
        return _aifc_params(self._nchannels, self._sampwidth, self._framerate,
                            self._nframes, self._comptype, self._compname)

def setmark(self, id, pos, name):
        if id <= 0:
            raise Error('marker ID must be > 0')
        if pos < 0:
            raise Error('marker position must be >= 0')
        if not isinstance(name, bytes):
            raise Error('marker name must be bytes')
        for i in range(len(self._markers)):
            if id == self._markers[i][0]:
                self._markers[i] = id, pos, name
                return
        self._markers.append((id, pos, name))

def getmark(self, id):
        for marker in self._markers:
            if id == marker[0]:
                return marker
        raise Error('marker {0!r} does not exist'.format(id))

def getmarkers(self):
        if len(self._markers) == 0:
            return None
        return self._markers

def tell(self):
        return self._nframeswritten

def writeframesraw(self, data):
        if not isinstance(data, (bytes, bytearray)):
            data = memoryview(data).cast('B')
        self._ensure_header_written(len(data))
        nframes = len(data) // (self._sampwidth * self._nchannels)
        if self._convert:
            data = self._convert(data)
        self._file.write(data)
        self._nframeswritten = self._nframeswritten + nframes
        self._datawritten = self._datawritten + len(data)

def writeframes(self, data):
        self.writeframesraw(data)
        if self._nframeswritten != self._nframes or \
              self._datalength != self._datawritten:
            self._patchheader()

def close(self):
        if self._file is None:
            return
        try:
            self._ensure_header_written(0)
            if self._datawritten & 1:
                # quick pad to even size
                self._file.write(b'\x00')
                self._datawritten = self._datawritten + 1
            self._writemarkers()
            if self._nframeswritten != self._nframes or \
                  self._datalength != self._datawritten or \
                  self._marklength:
                self._patchheader()
        finally:
            # Prevent ref cycles
            self._convert = None
            f = self._file
            self._file = None
            f.close()

#
    # Internal methods.
    #

def _lin2alaw(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        return audioop.lin2alaw(data, 2)

def _lin2ulaw(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        return audioop.lin2ulaw(data, 2)

def _lin2adpcm(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        if not hasattr(self, '_adpcmstate'):
            self._adpcmstate = None
        data, self._adpcmstate = audioop.lin2adpcm(data, 2, self._adpcmstate)
        return data

def _lin2sowt(self, data):
        with warnings.catch_warnings():
            warnings.simplefilter('ignore', category=DeprecationWarning)
            import audioop
        return audioop.byteswap(data, 2)

def _ensure_header_written(self, datasize):
        if not self._nframeswritten:
            if self._comptype in (b'ULAW', b'ulaw',
                b'ALAW', b'alaw', b'G722',
                b'sowt', b'SOWT'):
                if not self._sampwidth:
                    self._sampwidth = 2
                if self._sampwidth != 2:
                    raise Error('sample width must be 2 when compressing '
                                'with ulaw/ULAW, alaw/ALAW, sowt/SOWT '
                                'or G7.22 (ADPCM)')
            if not self._nchannels:
                raise Error('# channels not specified')
            if not self._sampwidth:
                raise Error('sample width not specified')
            if not self._framerate:
                raise Error('sampling rate not specified')
            self._write_header(datasize)

def _init_compression(self):
        if self._comptype == b'G722':
            self._convert = self._lin2adpcm
        elif self._comptype in (b'ulaw', b'ULAW'):
            self._convert = self._lin2ulaw
        elif self._comptype in (b'alaw', b'ALAW'):
            self._convert = self._lin2alaw
        elif self._comptype in (b'sowt', b'SOWT'):
            self._convert = self._lin2sowt

def _write_header(self, initlength):
        if self._aifc and self._comptype != b'NONE':
            self._init_compression()
        self._file.write(b'FORM')
        if not self._nframes:
            self._nframes = initlength // (self._nchannels * self._sampwidth)
        self._datalength = self._nframes * self._nchannels * self._sampwidth
        if self._datalength & 1:
            self._datalength = self._datalength + 1
        if self._aifc:
            if self._comptype in (b'ulaw', b'ULAW', b'alaw', b'ALAW'):
                self._datalength = self._datalength // 2
                if self._datalength & 1:
                    self._datalength = self._datalength + 1
            elif self._comptype == b'G722':
                self._datalength = (self._datalength + 3) // 4
                if self._datalength & 1:
                    self._datalength = self._datalength + 1
        try:
            self._form_length_pos = self._file.tell()
        except (AttributeError, OSError):
            self._form_length_pos = None
        commlength = self._write_form_length(self._datalength)
        if self._aifc:
            self._file.write(b'AIFC')
            self._file.write(b'FVER')
            _write_ulong(self._file, 4)
            _write_ulong(self._file, self._version)
        else:
            self._file.write(b'AIFF')
        self._file.write(b'COMM')
        _write_ulong(self._file, commlength)
        _write_short(self._file, self._nchannels)
        if self._form_length_pos is not None:
            self._nframes_pos = self._file.tell()
        _write_ulong(self._file, self._nframes)
        if self._comptype in (b'ULAW', b'ulaw', b'ALAW', b'alaw', b'G722'):
            _write_short(self._file, 8)
        else:
            _write_short(self._file, self._sampwidth * 8)
        _write_float(self._file, self._framerate)
        if self._aifc:
            self._file.write(self._comptype)
            _write_string(self._file, self._compname)
        self._file.write(b'SSND')
        if self._form_length_pos is not None:
            self._ssnd_length_pos = self._file.tell()
        _write_ulong(self._file, self._datalength + 8)
        _write_ulong(self._file, 0)
        _write_ulong(self._file, 0)

def _write_form_length(self, datalength):
        if self._aifc:
            commlength = 18 + 5 + len(self._compname)
            if commlength & 1:
                commlength = commlength + 1
            verslength = 12
        else:
            commlength = 18
            verslength = 0
        _write_ulong(self._file, 4 + verslength + self._marklength + \
                     8 + commlength + 16 + datalength)
        return commlength

def _patchheader(self):
        curpos = self._file.tell()
        if self._datawritten & 1:
            datalength = self._datawritten + 1
            self._file.write(b'\x00')
        else:
            datalength = self._datawritten
        if datalength == self._datalength and \
              self._nframes == self._nframeswritten and \
              self._marklength == 0:
            self._file.seek(curpos, 0)
            return
        self._file.seek(self._form_length_pos, 0)
        dummy = self._write_form_length(datalength)
        self._file.seek(self._nframes_pos, 0)
        _write_ulong(self._file, self._nframeswritten)
        self._file.seek(self._ssnd_length_pos, 0)
        _write_ulong(self._file, datalength + 8)
        self._file.seek(curpos, 0)
        self._nframes = self._nframeswritten
        self._datalength = datalength

def _writemarkers(self):
        if len(self._markers) == 0:
            return
        self._file.write(b'MARK')
        length = 2
        for marker in self._markers:
            id, pos, name = marker
            length = length + len(name) + 1 + 6
            if len(name) & 1 == 0:
                length = length + 1
        _write_ulong(self._file, length)
        self._marklength = length + 8
        _write_short(self._file, len(self._markers))
        for marker in self._markers:
            id, pos, name = marker
            _write_short(self._file, id)
            _write_ulong(self._file, pos)
            _write_string(self._file, name)

def open(f, mode=None):
    if mode is None:
        if hasattr(f, 'mode'):
            mode = f.mode
        else:
            mode = 'rb'
    if mode in ('r', 'rb'):
        return Aifc_read(f)
    elif mode in ('w', 'wb'):
        return Aifc_write(f)
    else:
        raise Error("mode must be 'r', 'rb', 'w', or 'wb'")

if __name__ == '__main__':
    import sys
    if not sys.argv[1:]:
        sys.argv.append('/usr/demos/data/audio/bach.aiff')
    fn = sys.argv[1]
    with open(fn, 'r') as f:
        print("Reading", fn)
        print("nchannels =", f.getnchannels())
        print("nframes   =", f.getnframes())
        print("sampwidth =", f.getsampwidth())
        print("framerate =", f.getframerate())
        print("comptype  =", f.getcomptype())
        print("compname  =", f.getcompname())
        if sys.argv[2:]:
            gn = sys.argv[2]
            print("Writing", gn)
            with open(gn, 'w') as g:
                g.setparams(f.getparams())
                while 1:
                    data = f.readframes(1024)
                    if not data:
                        break
                    g.writeframes(data)
            print("Done.")

cmd: