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namedtuple� _aifc_paramsz7nchannels sampwidth framerate nframes comptype compnamez3Number of audio channels (1 for mono, 2 for stereo)zSample width in byteszSampling frequencyzNumber of audio framesz(Compression type ("NONE" for AIFF files)zRA human-readable version of the compression type
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�r,| j �s4td��d 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 � _readmark�skip)�selfr �chunkZformdataZ chunknamer r r r �initfp4 sH
zAifc_read.initfpc C sL t |t�r>t�|d�}z| �|� W qH |�� � Y qHX n
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isinstance�str�builtinsr r[ �close�rY 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 | j�dkrd 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 exist�rP r �format�rY �id�markerr 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| j�d� | j�d�}| j| j }|r>| j�|d � d| _ |dkrPdS | j�|| j �}| jrv|rv| �|�}| jt|�| j| j | _|S )Nr rK r )
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zAifc_read.readframesc C s dd l }|�|d�S �Nr r )�audioopZalaw2lin�rY r r� r r r � _alaw2lin� s zAifc_read._alaw2linc C s dd l }|�|d�S r� )r� Zulaw2linr� r r r � _ulaw2lin� s zAifc_read._ulaw2linc C s2 dd l }t| d�sd | _|�|d| j�\}| _|S �Nr � _adpcmstater )r� �hasattrr� Z adpcm2linr� r r r �
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zAifc_read._adpcm2linc C sV t |�| _t|�| _t |�d d | _tt|��| _| jdkrFtd��| jdkrXtd��| j| j | _ | j
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| j| _n4| jdk�r | j| _n | jdk�r6| j| _ntd��d| _n d | _d| _d S )N� rK r �bad sample width�bad # of channels� r z Warning: bad COMM chunk size� r r" � NONE� G722�� ulaw� ULAW�� alaw� ALAW� unsupported compression typer � not compressed)r rn r rp rr r@ r- rt r r� rS Z chunksize�warnings�warnr rw r r r� r! rz r� rO r� r� )rY rZ Zkludger r r r rV � sD
zAifc_read._read_comm_chunkc C s� t |�}zDt|�D ]6}t |�}t|�}t|�}|s6|r| j�|||f� qW nD tk
r� dt| j�t| j�dkrxdnd|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 Znmarkers�ir� r� �name�wr 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 d<d=� Z!d>d?� Z"d@dA� Z#dBdC� Z$dDdE� Z%dFdG� Z&dHdI� Z'dS )J�
Aifc_writeNc C s\ t |t�rNt�|d�}z| �|� W n |�� � Y nX |�d�rXd| _n
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zAifc_write.__init__c C s^ || _ t| _d| _d| _d | _d| _d| _d| _d| _ d| _
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_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 rtd��d| _d S )N�0cannot change parameters after starting to writer �r� r rS rd r r r �aiff\ s zAifc_write.aiffc C s | j rtd��d| _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 �comptype�compnamer 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| jstd��t| j | j| j| j| j| j�S )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 d��t|t�s2t d��tt| j��D ],}|| 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 | j�dkrd 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 |ttf�s t|��d�}| �t|�� t|�| j| j }| j rN| � |�}| j
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zAifc_write.writeframesrawc C s. | � |� | j| jks"| j| jkr*| �� d S rc )r� r� rp r� r� � _patchheader)rY r r r r � writeframes� s
�zAifc_write.writeframesc C s� | j d krd S z^| �d� | jd@ r<| j �d� | jd | _| �� | j| jksb| j | jksb| j
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_writemarkersr� rp r� r� r� )rY r( r r r r` � s$
�� zAifc_write.closec C s dd l }|�|d�S r� )r� Zlin2alawr� r r r � _lin2alaw� s zAifc_write._lin2alawc C s dd l }|�|d�S r� )r� Zlin2ulawr� r r r � _lin2ulaw s zAifc_write._lin2ulawc C s2 dd l }t| d�sd | _|�|d| j�\}| _|S r� )r� r� r� Z lin2adpcmr� r r r �
_lin2adpcm s
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z!Aifc_write._ensure_header_writtenc C s> | j dkr| j| _n&| j dkr(| j| _n| j dkr:| j| _d S )Nr� r� r� )rw r� rO r� r� rd r r r �_init_compression s
z Aifc_write._init_compressionc C sJ | j r| jdkr| �� | j�d� | 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_pos�AttributeError�OSError�_write_form_lengthr6 rN r3 � _nframes_posrA rt r= rz �_ssnd_length_pos)rY Z
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zAifc_write._write_headerc C s\ | j r*dt| j� }|d@ r$|d }d}nd}d}t| jd| | j d | d | � |S ) Nr� r � r� r r rK � )rS r: rz r6 rR r� )rY �
datalengthr� Z
verslengthr r r r� X s" ����z Aifc_write._write_form_lengthc C s� | j �� }| jd@ r,| jd }| j �d� n| j}|| jkrd| j| jkrd| jdkrd| j �|d� d S | j �| j d� | �
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d� t | j |d � | j �|d� | j| _|| _d S )Nr r9 r rK )rR rm r� r/ r� rp r� r� r� r� r� r� r6 r� )rY Zcurposr� r r r r r� e s*
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zAifc_write._patchheaderc C s� t | j�dkrd S | j�d� d}| jD ]:}|\}}}|t |� d d }t |�d@ dkr(|d }q(t| j|� |d | _t| jt | j�� | jD ]2}|\}}}t| j|� t| j|� t| j|� q�d S )Nr rM r r � rK )r: rP rR r/ r6 r� r3 r= )rY r r� r� r� r� r r r r� { s"
zAifc_write._writemarkers)(r r r rR rb r[ r� re ri r� r� r� ro r� rs r� ru r� rq r� rx r{ r� r| r� r� r rm r� r� r` r� r� r� r� r� r� r� r� r� r r r r r� sJ
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r� c C sJ |d kr t | d�r| j}nd}|dkr.t| �S |dkr>t| �S td��d S )N�moder\ )�rr\ )r� r� z$mode must be 'r', 'rb', 'w', or 'wb')r� r� rE r� r �r( r� r r r r � s
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��__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)8r
r_ r� �__all__� Exceptionr r� r r r r r! r& r- r3 r4 r5 r6 r= rA rZ rB � collectionsrC rD r� �__doc__r� r� r� r� r� rE r� r r r �sys�argvr� �fnr( �printro rq rs ru rx r{ Zgn�gr� r| r� r r� r r r r �<module>� sz
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