Your IP : 18.191.218.194
3
\-E � @ s� d Z ddlZdddddgZG dd� de�Zd ZdZddlZddlZddl Z dd
l
m Z ddl m
Z
e
dd�ZG dd� d�ZG dd� d�Zddd�ZeZdS )a$
Stuff to parse WAVE files.
Usage.
Reading WAVE files:
f = wave.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().
When the setpos() and rewind() methods are 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 linear samples)
getcompname() -- returns human-readable version of
compression type ('not compressed' linear samples)
getparams() -- returns a namedtuple consisting of all of the
above in the above order
getmarkers() -- returns None (for compatibility with the
aifc module)
getmark(id) -- raises an error since the mark does not
exist (for compatibility with the aifc module)
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() and the position given to setpos()
are 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 WAVE files:
f = wave.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:
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
tell() -- return current position in output file
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.
The close() method is called automatically when the class instance
is destroyed.
� N�open�openfp�Error� Wave_read�
Wave_writec @ s e Zd ZdS )r N)�__name__�
__module__� __qualname__� r
r
� /usr/lib64/python3.6/wave.pyr N s � �b�h�i)�Chunk)�
namedtuple� _wave_paramsz7nchannels sampwidth framerate nframes comptype compnamec @ s� e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
d � Zd d
� Z dd� Z
dd� Z dd� Z dd� Z
dd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� Zd(d)� Zd*d+� Zd,S )-r aP 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
_soundpos -- the position in the audio stream
available through the tell() method, set through the
setpos() method
These variables are used internally only:
_fmt_chunk_read -- 1 iff the FMT chunk has been read
_data_seek_needed -- 1 iff positioned correctly in audio
file for readframes()
_data_chunk -- instantiation of a chunk class for the DATA chunk
_framesize -- size of one frame in the file
c C s d | _ d| _t|dd�| _| jj� dkr0td��| jjd�dkrHtd��d| _d | _x�d| _ yt| jdd�}W n t
k
r� P Y nX |j� }|d kr�| j |� d| _n2|d
kr�| js�td ��|| _|j | j
| _d| _ P |j� qVW | j s�| j �r td ��d S )
Nr )Z bigendians RIFFz file does not start with RIFF id� s WAVEznot a WAVE filer s fmt s datazdata chunk before fmt chunkz#fmt chunk and/or data chunk missing)�_convert� _soundposr �_fileZgetnamer �readZ_fmt_chunk_read� _data_chunk�_data_seek_needed�EOFError�_read_fmt_chunkZ chunksize�
_framesize�_nframes�skip)�self�file�chunkZ chunknamer
r
r �initfp} s:
zWave_read.initfpc C sR d | _ t|t�r"tj|d�}|| _ y| j|� W n | j rF|j� � Y nX d S )N�rb)�_i_opened_the_file�
isinstance�str�builtinsr r" �close)r �fr
r
r �__init__� s
zWave_read.__init__c C s | j � d S )N)r( )r r
r
r �__del__� s zWave_read.__del__c C s | S )Nr
)r r
r
r � __enter__� s zWave_read.__enter__c G s | j � d S )N)r( )r �argsr
r
r �__exit__� s zWave_read.__exit__c C s | j S )N)r )r r
r
r �getfp� s zWave_read.getfpc C s d| _ d| _d S )Nr r )r r )r r
r
r �rewind� s zWave_read.rewindc C s" d | _ | j}|r d | _|j� d S )N)r r$ r( )r r r
r
r r( � s
zWave_read.closec C s | j S )N)r )r r
r
r �tell� s zWave_read.tellc C s | j S )N)�
_nchannels)r r
r
r � getnchannels� s zWave_read.getnchannelsc C s | j S )N)r )r r
r
r �
getnframes� s zWave_read.getnframesc C s | j S )N)�
_sampwidth)r r
r
r � getsampwidth� s zWave_read.getsampwidthc C s | j S )N)�
_framerate)r r
r
r � getframerate� s zWave_read.getframeratec C s | j S )N)� _comptype)r r
r
r � getcomptype� s zWave_read.getcomptypec C s | j S )N)� _compname)r r
r
r � getcompname� s zWave_read.getcompnamec C s* t | j� | j� | j� | j� | j� | j� �S )N)r r3 r6 r8 r4 r: r< )r r
r
r � getparams� s zWave_read.getparamsc C s d S )Nr
)r r
r
r �
getmarkers� s zWave_read.getmarkersc C s t d��d S )Nzno marks)r )r �idr
r
r �getmark� s zWave_read.getmarkc C s* |dk s|| j krtd��|| _d| _d S )Nr zposition not in ranger )r r r r )r �posr
r
r �setpos� s zWave_read.setposc C s� | j r8| jjdd� | j| j }|r2| jj|d� d| _ |dkrDdS | jj|| j �}| jdkrxtjdkrxt j
|| j�}| j r�|r�| j |�}| jt |�| j
| j | _|S )Nr � r �big)r r �seekr r r r5 �sys� byteorder�audioop�byteswapr �lenr2 )r �nframesrA �datar
r
r �
readframes� s
zWave_read.readframesc C sz t jd|jd��\}| _| _}}|tkrNt jd|jd��d }|d d | _ntd|f ��| j| j | _d | _ d
| _
d S ) Nz<HHLLH� z<H� r � � zunknown format: %r�NONEznot compressed) �struct� unpack_fromr r2 r7 �WAVE_FORMAT_PCMr5 r r r9 r; )r r! Z
wFormatTagZdwAvgBytesPerSecZ wBlockAlign� sampwidthr
r
r r � s zWave_read._read_fmt_chunkN)r r r �__doc__r" r* r+ r, r. r/ r0 r( r1 r3 r4 r6 r8 r: r< r= r> r@ rB rM r r
r
r
r r ^ s,
c @ s� e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
d � Zd d
� Z dd� Z
dd� Z dd� Z dd� Z
dd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� Zd(d)� Zd*d+� Zd,d-� Zd.d/� Zd0d1� Zd2d3� Z d4d5� Z d6d7� Z d8d9� Z d:S );r a� Variables used in this class:
These variables are user settable through appropriate methods
of this class:
_file -- the open file with methods write(), close(), tell(), seek()
set through the __init__() method
_comptype -- the AIFF-C compression type ('NONE' in AIFF)
set through the setcomptype() or setparams() method
_compname -- the human-readable AIFF-C compression type
set through the setcomptype() or setparams() method
_nchannels -- the number of audio channels
set through the setnchannels() or setparams() method
_sampwidth -- the number of bytes per audio sample
set through the setsampwidth() or setparams() method
_framerate -- the sampling frequency
set through the setframerate() or setparams() method
_nframes -- the number of audio frames written to the header
set through the setnframes() or setparams() method
These variables are used internally only:
_datalength -- the size of the audio samples written to the header
_nframeswritten -- the number of frames actually written
_datawritten -- the size of the audio samples actually written
c C sR d | _ t|t�r"tj|d�}|| _ y| j|� W n | j rF|j� � Y nX d S )N�wb)r$ r% r& r' r r" r( )r r) r
r
r r* # s
zWave_write.__init__c C s@ || _ d | _d| _d| _d| _d| _d| _d| _d| _d| _ d S )Nr F)
r r r2 r5 r7 r �_nframeswritten� _datawritten� _datalength�_headerwritten)r r r
r
r r" / s zWave_write.initfpc C s | j � d S )N)r( )r r
r
r r+ ; s zWave_write.__del__c C s | S )Nr
)r r
r
r r, > s zWave_write.__enter__c G s | j � d S )N)r( )r r- r
r
r r. A s zWave_write.__exit__c C s( | j rtd��|dk r td��|| _d S )Nz0cannot change parameters after starting to writer zbad # of channels)rZ r r2 )r � nchannelsr
r
r � setnchannelsG s
zWave_write.setnchannelsc C s | j std��| j S )Nznumber of channels not set)r2 r )r r
r
r r3 N s zWave_write.getnchannelsc C s0 | j rtd��|dk s |dkr&td��|| _d S )Nz0cannot change parameters after starting to writer r zbad sample width)rZ r r5 )r rV r
r
r � setsampwidthS s
zWave_write.setsampwidthc C s | j std��| j S )Nzsample width not set)r5 r )r r
r
r r6 Z s zWave_write.getsampwidthc C s0 | j rtd��|dkr td��tt|��| _d S )Nz0cannot change parameters after starting to writer zbad frame rate)rZ r �int�roundr7 )r � framerater
r
r � setframerate_ s
zWave_write.setframeratec C s | j std��| j S )Nzframe rate not set)r7 r )r r
r
r r8 f s zWave_write.getframeratec C s | j rtd��|| _d S )Nz0cannot change parameters after starting to write)rZ r r )r rK r
r
r �
setnframesk s zWave_write.setnframesc C s | j S )N)rY )r r
r
r r4 p s zWave_write.getnframesc C s. | j rtd��|dkr td��|| _|| _d S )Nz0cannot change parameters after starting to writerR z unsupported compression type)rR )rZ r r9 r; )r �comptype�compnamer
r
r � setcomptypes s zWave_write.setcomptypec C s | j S )N)r9 )r r
r
r r: { s zWave_write.getcomptypec C s | j S )N)r; )r r
r
r r< ~ s zWave_write.getcompnamec C sV |\}}}}}}| j r td��| j|� | j|� | j|� | j|� | j||� d S )Nz0cannot change parameters after starting to write)rZ r r^ r_ rc rd rg )r Zparamsr] rV rb rK re rf r
r
r � setparams� s
zWave_write.setparamsc C s> | j s| j s| j r td��t| j | j| j| j| j| j�S )Nznot all parameters set)r2 r5 r7 r r r r9 r; )r r
r
r r= � s zWave_write.getparamsc C s t d��d S )Nzsetmark() not supported)r )r r? rA �namer
r
r �setmark� s zWave_write.setmarkc C s t d��d S )Nzno marks)r )r r? r
r
r r@ � s zWave_write.getmarkc C s d S )Nr
)r r
r
r r> � s zWave_write.getmarkersc C s | j S )N)rY )r r
r
r r1 � s zWave_write.tellc C s� t |ttf�s t|�jd�}| jt|�� t|�| j| j }| j rN| j |�}| jdkrpt
j dkrpt j
|| j�}| jj|� | jt|�7 _| j| | _d S )N�Br rD )r% �bytes� bytearray�
memoryview�cast�_ensure_header_writtenrJ r5 r2 r rF rG rH rI r �writerZ rY )r rL rK r
r
r �writeframesraw� s
zWave_write.writeframesrawc C s" | j |� | j| jkr | j� d S )N)rr r[ rZ � _patchheader)r rL r
r
r � writeframes� s
zWave_write.writeframesc C sX z2| j r0| jd� | j| jkr&| j� | j j� W d d | _ | j}|rRd | _|j� X d S )Nr )r rp r[ rZ rs �flushr$ r( )r r r
r
r r( � s
zWave_write.closec C s> | j s:| jstd��| js"td��| js0td��| j|� d S )Nz# channels not specifiedzsample width not specifiedzsampling rate not specified)r\ r2 r r5 r7 �
_write_header)r Zdatasizer
r
r rp � s z!Wave_write._ensure_header_writtenc C s� | j s t�| jjd� | js0|| j| j | _| j| j | j | _y| jj� | _ W n t
t fk
rr d | _ Y nX | jjt j
dd| j dddt| j| j| j| j | j | j| j | jd d� � | j d k r�| jj� | _| jjt j
d | j�� d
| _ d S ) Ns RIFFz<L4s4sLHHLLHH4s�$ s WAVEs fmt � rQ s dataz<LT)r\ �AssertionErrorr rq r r2 r5 r[ r1 �_form_length_pos�AttributeError�OSErrorrS �packrU r7 �_data_length_pos)r Z
initlengthr
r
r rv � s&
zWave_write._write_headerc C s� | j s
t�| j| jkrd S | jj� }| jj| jd� | jjt j
dd| j �� | jj| j d� | jjt j
d| j�� | jj|d� | j| _d S )Nr z<Lrw ) r\ ry rZ r[ r r1 rE rz rq rS r} r~ )r Zcurposr
r
r rs � s
zWave_write._patchheaderN) r r r rW r* r" r+ r, r. r^ r3 r_ r6 rc r8 rd r4 rg r: r< rh r= rj r@ r> r1 rr rt r( rp rv rs r
r
r
r r s:
c C sJ |d kr t | d�r| j}nd}|dkr.t| �S |dkr>t| �S td��d S ) N�moder# �r�wrX z$mode must be 'r', 'rb', 'w', or 'wb')r� r# )r� rX )�hasattrr r r r )r) r r
r
r r � s
)Nr
r Nr )N)rW r' �__all__� Exceptionr rU Z _array_fmtsrH rS rF r! r � collectionsr r r r r r r
r
r
r �<module>H s$ , d