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"""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"
,
"openfp"
]
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
def
_read_ulong
(
file
):
try
:
return
struct
.
unpack
(
'>L'
,
file
.
read
(
4
))[
0
]
except
struct
.
error
:
raise
EOFError
def
_read_short
(
file
):
try
:
return
struct
.
unpack
(
'>h'
,
file
.
read
(
2
))[
0
]
except
struct
.
error
:
raise
EOFError
def
_read_ushort
(
file
):
try
:
return
struct
.
unpack
(
'>H'
,
file
.
read
(
2
))[
0
]
except
struct
.
error
:
raise
EOFError
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
)
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
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
):
import
audioop
return
audioop
.
alaw2lin
(
data
,
2
)
def
_ulaw2lin
(
self
,
data
):
import
audioop
return
audioop
.
ulaw2lin
(
data
,
2
)
def
_adpcm2lin
(
self
,
data
):
import
audioop
if
not
hasattr
(
self
,
'_adpcmstate'
):
# first time
self
.
_adpcmstate
=
None
data
,
self
.
_adpcmstate
=
audioop
.
adpcm2lin
(
data
,
2
,
self
.
_adpcmstate
)
return
data
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
))
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
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'
):
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'
):
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
):
import
audioop
return
audioop
.
lin2alaw
(
data
,
2
)
def
_lin2ulaw
(
self
,
data
):
import
audioop
return
audioop
.
lin2ulaw
(
data
,
2
)
def
_lin2adpcm
(
self
,
data
):
import
audioop
if
not
hasattr
(
self
,
'_adpcmstate'
):
self
.
_adpcmstate
=
None
data
,
self
.
_adpcmstate
=
audioop
.
lin2adpcm
(
data
,
2
,
self
.
_adpcmstate
)
return
data
def
_ensure_header_written
(
self
,
datasize
):
if
not
self
.
_nframeswritten
:
if
self
.
_comptype
in
(
b'ULAW'
,
b'ulaw'
,
b'ALAW'
,
b'alaw'
,
b'G722'
):
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 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
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'"
)
openfp
=
open
# B/W compatibility
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."
)
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