U
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@ sB d Z ddlZddlZddlZdddgZG dd deZdZdd Zd
d Z d d
Z
dd Z dd Z dZ
dd Zdd Zdd Zdd Zdd Zd d Zd d Zdd!lmZ dd"lmZ ed#d$Zd%ej_ d&ej_ d'ej _ d(ej _ d)ej _ d*ej _ G d+d, d,Z G d-d. d.Z!dAd/dZ"dBd0dZ#e$d1kr>ddl%Z%e%j&d2d sNe%j&'d3 e%j&d2 Z(e"e(d4Z)e*d5e( e*d6e)+ e*d7e), e*d8e)- e*d9e). e*d:e)/ e*d;e)0 e%j&d6Z2e23e)4 e)5d?Z6e6sq"e27e6 q W 5 Q R X e*d@ W 5 Q R X dS )CaJ 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 |
+-----------------+
| |
+----+------------+
| | AIFC |
| +------------+
| | |
| | . |
| | . |
| | . |
+----+------------+
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
(AIFF-C only).
MARK
<# of markers> (2 bytes)
list of markers:
(2 bytes, must be > 0)
(4 bytes)
("pstring")
COMM
<# of channels> (2 bytes)
<# of sound frames> (4 bytes)
(2 bytes)
(10 bytes, IEEE 80-bit extended
floating point)
in AIFF-C files only:
(4 bytes)
("pstring")
SSND
(4 bytes, not used by this program)
(4 bytes, not used by this program)
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.
NErroropenopenfpc @ s e Zd ZdS )r N)__name__
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r4 td Y nX d S )N>l r structZunpackreaderrorEOFErrorfiler r r
_read_long s r c C s: zt d| dd W S t jk
r4 td Y nX d S )N>Lr r r r r r r _read_ulong s r c C s: zt d| dd W S t jk
r4 td Y nX d S )N>h r r r r r r _read_short s r c C s: zt d| dd W S t jk
r4 td Y nX d S )N>Hr r r r r r r _read_ushort s r c C s@ t | d}|dkr d}n
| |}|d@ dkr<| d}|S )N r )ordr )r lengthdatadummyr r r _read_string s
r! gc C s t | }d}|dk r d}|d }t| }t| }|| krN| krNdkrXn nd} n0|dkrft} n"|d }|d | td |d
} || S ) Nr r g i? l g @? )r r _HUGE_VALpow)fexponsignhimantlomantr r r _read_float s "r- c C s | td| d S )Nr writer
packr( xr r r _write_short s r3 c C s | td| d S )Nr r. r1 r r r
_write_ushort s r4 c C s | td| d S )Nr
r. r1 r r r _write_long s r5 c C s | td| d S )Nr r. r1 r r r _write_ulong s r6 c C sR t |dkrtd| tdt | | | t |d@ dkrN| d d S )N z%string exceeds maximum pstring lengthBr r )len
ValueErrorr/ r
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('not compressed' for AIFF files)c @ s e Zd ZdZdd Zdd Zdd Zdd Zd
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dd Zdd Zdd Zd d Zd d Zd d! Zd"d# Zd$d% Zd&d' Zd(d) Zd*d+ Zd,d- Zd.d/ Zd0d1 ZdS )2 Aifc_readNc C s8 d| _ d | _g | _d| _|| _t|}| dkr:td|d}|dkrTd| _ n|dkrdd| _ ntdd| _
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r,| j s4tdd S )Nr FORMz file does not start with FORM idr AIFF AIFCr znot an AIFF or AIFF-C file COMM SSND FVER MARKz$COMM chunk and/or SSND chunk missing)_version_convert_markers _soundpos_filerB Zgetnamer r _aifcZ_comm_chunk_read _ssnd_chunk_ssnd_seek_neededr _read_comm_chunkr _readmarkskip)selfr chunkZformdataZ chunknamer r r r initfp4 sH
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isinstancestrbuiltinsr r[ closerY r( Z file_objectr r r __init__\ s
zAifc_read.__init__c C s | S Nr rY r r r __enter__h s zAifc_read.__enter__c G s | d S rc r` rY argsr r r __exit__k s zAifc_read.__exit__c C s | j S rc )rR rd r r r getfpq s zAifc_read.getfpc C s d| _ d| _d S )Nr r )rU rQ rd r r r rewindt s zAifc_read.rewindc C s | j }|d k r d | _ | d S rc )rR r` rY r r r r r` x s zAifc_read.closec C s | j S rc )rQ rd r r r tell~ s zAifc_read.tellc C s | j S rc )
_nchannelsrd r r r getnchannels s zAifc_read.getnchannelsc C s | j S rc )_nframesrd r r r
getnframes s zAifc_read.getnframesc C s | j S rc )
_sampwidthrd r r r getsampwidth s zAifc_read.getsampwidthc C s | j S rc )
_frameraterd r r r getframerate s zAifc_read.getframeratec C s | j S rc _comptyperd r r r getcomptype s zAifc_read.getcomptypec C s | j S rc _compnamerd r r r getcompname s zAifc_read.getcompnamec C s* t | | | | | | S rc )rD ro rs ru rq rx r{ rd r r r getparams s zAifc_read.getparamsc C s t | jdkrd S | jS Nr r: rP rd r r r
getmarkers s zAifc_read.getmarkersc C s2 | j D ]}||d kr| S qtd|d S Nr zmarker {0!r} does not existrP r formatrY idmarkerr r r getmark s
zAifc_read.getmarkc C s* |dk s|| j krtd|| _d| _d S )Nr zposition not in ranger )rp r rQ rU )rY posr r r setpos s zAifc_read.setposc C s | j rD| jd | jd}| j| j }|r>| j|d d| _ |dkrPdS | j|| j }| jrv|rv| |}| jt|| j| j | _|S )Nr rK r )
rU rT seekr rQ
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readframes s
zAifc_read.readframesc C s dd l }||dS Nr r )audioopZalaw2linrY r r r r r _alaw2lin s zAifc_read._alaw2linc C s dd l }||dS r )r Zulaw2linr r r r _ulaw2lin s zAifc_read._ulaw2linc C s2 dd l }t| dsd | _||d| j\}| _|S Nr _adpcmstater )r hasattrr Z adpcm2linr r r r
_adpcm2lin s
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rFd}|j dkrd}t
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zAifc_read._read_comm_chunkc C s t |}zDt|D ]6}t |}t|}t|}|s6|r| j|||f qW nD tk
r dt| jt| jdkrxdnd|f }t | Y nX d S )Nz;Warning: MARK chunk contains only %s marker%s instead of %sr r< )
r ranger r! rP appendr r: r r )rY rZ Znmarkersir r namewr r r rW s zAifc_read._readmark) r r r rR r[ rb re ri rj rk r` rm ro rq rs ru rx r{ r| r r r r r r r rV rW r r r r rE s2 $( *rE c @ s0 e Zd ZdZdd Zdd Zdd Zdd Zd
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dd Zdd Zdd Zd d Zd d Zd d! Zd"d# Zd$d% Zd&d' Zd(d) Zd*d+ Zd,d- Zd.d/ Zd0d1 Zd2d3 Z d4d5 Z d6d7 Z d8d9 Z d:d; Z dd? Z"d@dA Z#dBdC Z$dDdE Z%dFdG Z&dHdI Z'dS )J
Aifc_writeNc C s\ t |trNt|d}z| | W n | Y nX |drXd| _n
| | d S )Nwbz.aiffr )r] r^ r_ r r[ r` endswithrS ra r r r rb / s
zAifc_write.__init__c C s^ || _ t| _d| _d| _d | _d| _d| _d| _d| _ d| _
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d| _d| _d S )Nr r r r )rR
_AIFC_versionrN rw rz rO rn rr rt rp _nframeswritten _datawritten _datalengthrP _marklengthrS rl r r r r[ ? s zAifc_write.initfpc C s | d S rc rf rd r r r __del__P s zAifc_write.__del__c C s | S rc r rd r r r re S s zAifc_write.__enter__c G s | d S rc rf rg r r r ri V s zAifc_write.__exit__c C s | j rtdd| _d S )N0cannot change parameters after starting to writer r r rS rd r r r aiff\ s zAifc_write.aiffc C s | j rtdd| _d S )Nr r r rd r r r aifca s zAifc_write.aifcc C s( | j rtd|dk r td|| _d S )Nr r r )r r rn )rY nchannelsr r r setnchannelsf s
zAifc_write.setnchannelsc C s | j std| j S )Nznumber of channels not set)rn r rd r r r ro m s zAifc_write.getnchannelsc C s0 | j rtd|dk s |dkr&td|| _d S )Nr r r r )r r rr )rY sampwidthr r r setsampwidthr s
zAifc_write.setsampwidthc C s | j std| j S )Nzsample width not set)rr r rd r r r rs y s zAifc_write.getsampwidthc C s( | j rtd|dkr td|| _d S )Nr r zbad frame rate)r r rt )rY framerater r r setframerate~ s
zAifc_write.setframeratec C s | j std| j S )Nzframe rate not set)rt r rd r r r ru s zAifc_write.getframeratec C s | j rtd|| _d S )Nr )r r rp )rY r r r r
setnframes s zAifc_write.setnframesc C s | j S rc r rd r r r rq s zAifc_write.getnframesc C s. | j rtd|dkr td|| _|| _d S Nr )r r r r r r r )r r rw rz )rY comptypecompnamer r r setcomptype s zAifc_write.setcomptypec C s | j S rc rv rd r r r rx s zAifc_write.getcomptypec C s | j S rc ry rd r r r r{ s zAifc_write.getcompnamec C sf |\}}}}}}| j r td|dkr.td| | | | | | | | | || d S r )r r r r r r r )rY Zparamsr r r r r r r r r setparams s
zAifc_write.setparamsc C s8 | j r| jr| jstdt| j | j| j| j| j| jS )Nznot all parameters set)rn rr rt r rD rp rw rz rd r r r r| s zAifc_write.getparamsc C s |dkrt d|dk r t dt|ts2t dtt| jD ],}|| j| d kr@|||f| j|< d S q@| j|||f d S )Nr zmarker ID must be > 0z marker position must be >= 0zmarker name must be bytes)r r] bytesr r: rP r )rY r r r r r r r setmark s
zAifc_write.setmarkc C s2 | j D ]}||d kr| S qtd|d S r r r r r r r s
zAifc_write.getmarkc C s t | jdkrd S | jS r} r~ rd r r r r s zAifc_write.getmarkersc C s | j S rc r rd r r r rm s zAifc_write.tellc C sz t |ttfs t|d}| t| t|| j| j }| j rN| |}| j
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z Aifc_write._init_compressionc C sJ | j r| jdkr| | jd | js<|| j| j | _| j| j | j | _| jd@ rf| jd | _| j r| jdkr| jd | _| jd@ r| jd | _n0| jdkr| jd d | _| jd@ r| jd | _z| j | _
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d k r | j | _t| j| jd t| jd t| jd d S )Nr rF r )r r r r r r r rH rL rG rI r rK rJ r )rS rw r rR r/ rp rn rr r rm _form_length_posAttributeErrorOSError_write_form_lengthr6 rN r3 _nframes_posrA rt r= rz _ssnd_length_pos)rY Z
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zAifc_write._patchheaderc C s t | jdkrd S | jd d}| jD ]:}|\}}}|t | d d }t |d@ dkr(|d }q(t| j| |d | _t| jt | j | jD ]2}|\}}}t| j| t| j| t| j| qd S )Nr rM r r rK )r: rP rR r/ r6 r r3 r= )rY r r r r r r r r r { s"
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stacklevel)r )r r DeprecationWarningr r r r r r s
__main__r z /usr/demos/data/audio/bach.aiffr ZReadingz nchannels =z nframes =z sampwidth =z framerate =z comptype =z compname =r ZWritingr i zDone.)N)N)8__doc__r
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