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l g @�? ���)r r � _HUGE_VAL�pow)�f�expon�sign�himant�lomantr r r � _read_float� s "r& c C s | j tjd|�� d S )Nz>h)�writer �pack)r! �xr r r � _write_short� s r* c C s | j tjd|�� d S )Nz>H)r' r r( )r! r) r r r � _write_ushort� s r+ c C s | j tjd|�� d S )Nz>l)r' r r( )r! r) r r r � _write_long� s r, c C s | j tjd|�� d S )Nz>L)r' r r( )r! r) r r r � _write_ulong� s r- c C sR t |�dkrtd��| jtjdt |��� | j|� t |�d@ dkrN| jd� d S )N� z%string exceeds maximum pstring length�Br r � )�len� ValueErrorr' r r( )r! �sr r r � _write_string� s r4 c C s� dd l }|dk r d}|d }nd}|dkr8d}d}d}n�|j|�\}}|dks^|dks^||krp|dB }d}d}nh|d }|dk r�|j||�}d}||B }|j|d�}|j|�}t|�}|j|| d�}|j|�}t|�}t| |� t| |� t| |� d S ) Nr i � r i @ i� i�? � r )�mathZfrexpZldexpZfloor�intr+ r- ) r! r) r6 r# r" r$ r% ZfmantZfsmantr r r � _write_float� s8 r8 )�Chunk)� 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 ('not compressed' for AIFF files)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$d%� Zd&d'� Zd(d)� Zd*d+� Zd,d-� Zd.d/� Zd0d1� ZdS )2� Aifc_readNc C s< d| _ d | _g | _d| _|| _t|�}|j� dkr:td��|jd�}|dkrTd| _ n|dkrdd| _ ntd��d| _ d | _ x�d| _ yt| j�}W n t k r� P Y nX |j� }|d kr�| j|� d| _ nH|d kr�|| _ |jd �}d| _ n(|d kr�t|�| _ n|d k�r| j|� |j� qzW | j �s0| j �r8td��d S )Nr s FORMz file does not start with FORM idr s AIFFs AIFCr znot an AIFF or AIFF-C files COMMs SSND� s FVERs MARKz$COMM chunk and/or SSND chunk missing)�_version�_convert�_markers� _soundpos�_filer9 Zgetnamer r �_aifcZ_comm_chunk_read� _ssnd_chunk�_ssnd_seek_neededr �_read_comm_chunkr � _readmark�skip)�selfr �chunkZformdataZ chunknamer r r r �initfp4 sJ zAifc_read.initfpc C sL t |t�r>tj|d�}y| j|� W qH |j� � Y qHX n | j|� d S )N�rb)� isinstance�str�builtinsr rK �close)rI r! � file_objectr r r �__init__\ s zAifc_read.__init__c C s | S )Nr )rI r r r � __enter__h s zAifc_read.__enter__c G s | j � d S )N)rP )rI �argsr r r �__exit__k s zAifc_read.__exit__c C s | j S )N)rB )rI r r r �getfpq s zAifc_read.getfpc C s d| _ d| _d S )Nr r )rE rA )rI r r r �rewindt s zAifc_read.rewindc C s | j }|d k r d | _ |j� d S )N)rB rP )rI r r r r rP x s zAifc_read.closec C s | j S )N)rA )rI r r r �tell~ s zAifc_read.tellc C s | j S )N)� _nchannels)rI r r r � getnchannels� s zAifc_read.getnchannelsc C s | j S )N)�_nframes)rI r r r � getnframes� s zAifc_read.getnframesc C s | j S )N)� _sampwidth)rI r r r � getsampwidth� s zAifc_read.getsampwidthc C s | j S )N)� _framerate)rI r r r � getframerate� s zAifc_read.getframeratec C s | j S )N)� _comptype)rI r r r � getcomptype� s zAifc_read.getcomptypec C s | j S )N)� _compname)rI r r r � getcompname� s zAifc_read.getcompnamec C s* t | j� | j� | j� | j� | j� | j� �S )N)r; rZ r^ r` r\ rb rd )rI r r r � getparams� s zAifc_read.getparamsc C s t | j�dkrd S | jS )Nr )r1 r@ )rI r r r � getmarkers� s zAifc_read.getmarkersc C s2 x | j D ]}||d kr|S qW tdj|���d S )Nr zmarker {0!r} does not exist)r@ r �format)rI �id�markerr r r �getmark� s zAifc_read.getmarkc C s* |dk s|| j krtd��|| _d| _d S )Nr zposition not in ranger )r[ r rA rE )rI �posr r r �setpos� s zAifc_read.setposc C s� | j rD| jjd� | jjd�}| j| j }|r>| jj|d � d| _ |dkrPdS | jj|| j �}| jrv|rv| j|�}| jt|�| j| j | _|S )Nr r= r ) rE rD �seekr rA � _framesizer? r1 rY r] )rI �nframesr rk r r r r � readframes� s zAifc_read.readframesc C s dd l }|j|d�S )Nr r )�audioopZalaw2lin)rI r rq r r r � _alaw2lin� s zAifc_read._alaw2linc C s dd l }|j|d�S )Nr r )rq Zulaw2lin)rI r rq r r r � _ulaw2lin� s zAifc_read._ulaw2linc C s2 dd l }t| d�sd | _|j|d| j�\}| _|S )Nr � _adpcmstater )rq �hasattrrt Z adpcm2lin)rI r rq r r r � _adpcm2lin� s zAifc_read._adpcm2linc C s. t |�| _t|�| _t |�d d | _tt|��| _| j| j | _| j �r d}|j dkrld}t j d� d|_ |j d�| _|r�t|jj d��}|d@ dkr�|d }|j | |_ |jjdd� t|�| _| jd k�r*| jd kr�| j| _n2| jdkr�| j| _n | jdk�r| j| _ntd��d| _n d | _d| _d S )N� r= r � r z Warning: bad COMM chunk size� r s NONEs G722� ulaw� ULAW� alaw� ALAWz unsupported compression typer s not compressedr )rz r{ )r| r} )r rY r r[ r] r7 r& r_ rn rC Z chunksize�warnings�warnr ra r r rm r rc rv r? rs rr r )rI rJ Zkludger r r r rF � s< zAifc_read._read_comm_chunkc C s� t |�}yHxBt|�D ]6}t |�}t|�}t|�}|s8|r| jj|||f� qW W nD tk r� dt| j�t| j�dkr|dnd|f }tj |� Y nX d S )Nz;Warning: MARK chunk contains only %s marker%s instead of %sr � r3 ) r �ranger r r@ �appendr r1 r~ r )rI rJ Znmarkers�irh rk �name�wr r r rG � s zAifc_read._readmark) r r r rB rK rR rS rU rV rW rP rX rZ r\ r^ r` rb rd re rf rj rl rp rr rs rv rF rG r r r r r< s2 $( &r< c @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z dd� Z dd� Z dd� Z dd� Z dd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� Zd(d)� Zd*d+� Zd,d-� Zd.d/� Zd0d1� Zd2d3� Z d4d5� Z d6d7� Z d8d9� Z d: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�rNtj|d�}y| j|� W n |j� � Y nX |jd�rXd| _n | j|� d S )N�wbz.aiffr )rM rN rO r rK rP �endswithrC )rI r! rQ r r r rR + s zAifc_write.__init__c C s^ || _ t| _d| _d| _d | _d| _d| _d| _d| _ d| _ d| _ d| _ g | _ d| _d| _d S )Ns NONEs not compressedr r )rB � _AIFC_versionr> ra rc r? rY r] r_ r[ �_nframeswritten� _datawritten� _datalengthr@ � _marklengthrC )rI r r r r rK ; s zAifc_write.initfpc C s | j � d S )N)rP )rI r r r �__del__L s zAifc_write.__del__c C s | S )Nr )rI r r r rS O s zAifc_write.__enter__c G s | j � d S )N)rP )rI rT r r r rU R s zAifc_write.__exit__c C s | j rtd��d| _d S )Nz0cannot change parameters after starting to writer )r� r rC )rI r r r �aiffX s zAifc_write.aiffc C s | j rtd��d| _d S )Nz0cannot change parameters after starting to writer )r� r rC )rI r r r �aifc] s zAifc_write.aifcc C s( | j rtd��|dk r td��|| _d S )Nz0cannot change parameters after starting to writer zbad # of channels)r� r rY )rI � nchannelsr r r � setnchannelsb s zAifc_write.setnchannelsc C s | j std��| j S )Nznumber of channels not set)rY r )rI r r r rZ i s zAifc_write.getnchannelsc C s0 | j rtd��|dk s |dkr&td��|| _d S )Nz0cannot change parameters after starting to writer r zbad sample width)r� r r] )rI � sampwidthr r r � setsampwidthn s zAifc_write.setsampwidthc C s | j std��| j S )Nzsample width not set)r] r )rI r r r r^ u s zAifc_write.getsampwidthc C s( | j rtd��|dkr td��|| _d S )Nz0cannot change parameters after starting to writer zbad frame rate)r� r r_ )rI � framerater r r � setframeratez s zAifc_write.setframeratec C s | j std��| j S )Nzframe rate not set)r_ r )rI r r r r` � s zAifc_write.getframeratec C s | j rtd��|| _d S )Nz0cannot change parameters after starting to write)r� r r[ )rI ro r r r � setnframes� s zAifc_write.setnframesc C s | j S )N)r� )rI r r r r\ � s zAifc_write.getnframesc C s. | j rtd��|d kr td��|| _|| _d S ) Nz0cannot change parameters after starting to write� NONE� ulaw� ULAW� alaw� ALAW� G722z unsupported compression type)r� r� r� r� r� r� )r� r ra rc )rI �comptype�compnamer r r � setcomptype� s zAifc_write.setcomptypec C s | j S )N)ra )rI r r r rb � s zAifc_write.getcomptypec C s | j S )N)rc )rI r r r rd � s zAifc_write.getcompnamec C sf |\}}}}}}| j r td��|d kr.td��| j|� | j|� | j|� | j|� | j||� d S ) Nz0cannot change parameters after starting to write� NONE� ulaw� ULAW� alaw� ALAW� G722z unsupported compression type)r� r� r� r� r� r� )r� r r� r� r� r� r� )rI Zparamsr� r� r� ro r� r� r r r � setparams� s zAifc_write.setparamsc C s> | j s| j s| j r td��t| j | j| j| j| j| j�S )Nznot all parameters set)rY r] r_ r r; r[ ra rc )rI r r r re � s zAifc_write.getparamsc C s� |dkrt d��|dk r t d��t|t�s2t d��x<tt| j��D ]*}|| j| d krB|||f| j|< d S qBW | jj|||f� d S )Nr zmarker ID must be > 0z marker position must be >= 0zmarker name must be bytes)r rM �bytesr� r1 r@ r� )rI rh rk r� r� r r r �setmark� s zAifc_write.setmarkc C s2 x | j D ]}||d kr|S qW tdj|���d S )Nr zmarker {0!r} does not exist)r@ r rg )rI rh ri r r r rj � s zAifc_write.getmarkc C s t | j�dkrd S | jS )Nr )r1 r@ )rI r r r rf � s zAifc_write.getmarkersc C s | j S )N)r� )rI r r r rX � s zAifc_write.tellc C sz t |ttf�s t|�jd�}| jt|�� t|�| j| j }| j rN| j |�}| j j |� | j | | _ | j t|� | _ d S )Nr/ )rM r� � bytearray� memoryview�cast�_ensure_header_writtenr1 r] rY r? rB r' r� r� )rI r ro r r r �writeframesraw� s zAifc_write.writeframesrawc C s. | j |� | j| jks"| j| jkr*| j� d S )N)r� r� r[ r� r� � _patchheader)rI r r r r � writeframes� s zAifc_write.writeframesc C s� | j d krd S z^| jd� | jd@ r<| j jd� | jd | _| j� | j| jksb| j| jksb| jrj| j � W d d | _ | j }d | _ |j � X d S )Nr r r0 ) rB r� r� r' � _writemarkersr� r[ r� r� r� r? rP )rI r! r r r rP � s zAifc_write.closec C s dd l }|j|d�S )Nr r )rq Zlin2alaw)rI r rq r r r � _lin2alaw� s zAifc_write._lin2alawc C s dd l }|j|d�S )Nr r )rq Zlin2ulaw)rI r rq r r r � _lin2ulaw� s zAifc_write._lin2ulawc C s2 dd l }t| d�sd | _|j|d| j�\}| _|S )Nr rt r )rq ru rt Z lin2adpcm)rI r rq r r r � _lin2adpcm s zAifc_write._lin2adpcmc C sf | j sb| jd kr.| js d| _| jdkr.td��| js<td��| jsJtd ��| jsXtd ��| j|� d S ) N� ULAW� ulaw� ALAW� alaw� G722r zRsample width must be 2 when compressing with ulaw/ULAW, alaw/ALAW or G7.22 (ADPCM)z# channels not specifiedzsample width not specifiedzsampling rate not specified)r� r� r� r� r� )r� ra r] r rY r_ � _write_header)rI Zdatasizer r r r� s z!Aifc_write._ensure_header_writtenc C s> | j dkr| j| _n&| j dkr(| j| _n| j dkr:| j| _d S )Ns G722� ulaw� ULAW� alaw� ALAW)r� r� )r� r� )ra r� r? r� r� )rI r r r �_init_compression s z Aifc_write._init_compressionc C sL | j r| jdkr| j� | jjd� | js<|| j| j | _| j| j | j | _| jd@ rf| jd | _| j r�| jdkr�| jd | _| jd@ r�| jd | _n0| jd kr�| jd d | _| jd@ r�| jd | _y| jj � | _ W n t t fk � r� d | _ Y nX | j | j�}| j �rD| jjd � | jjd � t| jd � t| j| j� n | jjd� | jjd� t| j|� t| j| j� | j d k �r�| jj � | _t| j| j� | jdk�r�t| jd� nt| j| jd � t| j| j� | j �r�| jj| j� t| j| j� | jjd� | j d k �r | jj � | _t| j| jd � t| jd� t| jd� d S )Ns NONEs FORMr � ulaw� ULAW� alaw� ALAWr � G722� r s AIFCs FVERs AIFFs COMMr= s SSNDr )r� r� r� r� )r� r� r� r� r� )rC ra r� rB r' r[ rY r] r� rX �_form_length_pos�AttributeError�OSError�_write_form_lengthr- r> r* � _nframes_posr8 r_ r4 rc �_ssnd_length_pos)rI Z initlength� commlengthr r r r� ! s^ zAifc_write._write_headerc C s\ | j r*d t| j� }|d@ r$|d }d}nd}d}t| jd| | j d | d | � |S ) Nrx � r � r r r= � ry )rC r1 rc r- rB r� )rI � datalengthr� Z verslengthr r r r� T s z Aifc_write._write_form_lengthc C s� | j j� }| jd@ r,| jd }| j jd� n| j}|| jkrd| j| jkrd| jdkrd| j j|d� d S | j j| j d� | j |�}| j j| j d� t | j | j� | j j| j d� t | j |d � | j j|d� | j| _|| _d S )Nr r0 r r= )rB rX r� r' r� r[ r� r� rm r� r� r� r- r� )rI Zcurposr� r r r r r� a s& zAifc_write._patchheaderc C s� t | j�dkrd S | jjd� d}xD| jD ]:}|\}}}|t |� d d }t |�d@ dkr*|d }q*W t| j|� |d | _t| jt | j�� x<| jD ]2}|\}}}t| j|� t| j|� t| j|� q�W d S )Nr s MARKr r � r= )r1 r@ rB r' r- r� r* r4 )rI r ri rh rk r� r r r r� w s" zAifc_write._writemarkers)(r r r rB rR rK r� rS rU r� r� r� rZ r� r^ r� r` r� r\ r� rb rd r� re r� rj rf rX r� r� rP r� r� r� r� r� r� r� r� r� r r r r r� sJ 3 r� c C sJ |d kr t | d�r| j}nd}|dkr.t| �S |dkr>t| �S td��d S ) N�moderL �rr� r� z$mode must be 'r', 'rb', 'w', or 'wb')r� rL )r� r� )ru r� r< r� r )r! 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)8r rO r~ �__all__� Exceptionr r� r r r r r r r& r* r+ r, r- r4 r8 rJ r9 � collectionsr: r; r� �__doc__r� r� ro r� r� r< r� r r r �sys�argvr� �fnr! �printrZ r\ r^ r` rb rd Zgn�gr� re rp r r� r r r r �<module>� sx ! ~