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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 t j d | � � d S)Nz>h)�writer �pack)r! �xr r r � _write_short� s r* c C s | j t j d | � � d S)Nz>H)r' r r( )r! r) r r r � _write_ushort� s r+ c C s | j t j d | � � d S)Nz>l)r' r r( )r! r) r r r � _write_long� s r, c C s | j t j d | � � d S)Nz>L)r' r r( )r! r) r r r � _write_ulong� s r- c C sq t | � d k r t d � � | j t j d t | � � � | j | � t | � d @d k rm | j d � d S)N� z%string exceeds maximum pstring length�Br r s )�len� ValueErrorr' r r( )r! �sr r r � _write_string� s r3 c C se d d l } | d k r+ d } | d } n d } | d k rR d } d } d } n� | j | � \ } } | d k s� | d k s� | | k r� | d B} d } d } n� | d } | d k r� | j | | � } d } | | B} | j | d � } | j | � } t | � } | j | | d � } | j | � } t | � } t | | � t | | � t | | � d S) Nr i � r i @ i� i�? � r )�math�frexp�ldexp�floor�intr+ r- ) r! r) r5 r# r" r$ r% ZfmantZfsmantr r r � _write_float� s8 $ r: )�Chunk)� namedtuple� _aifc_paramsz7nchannels sampwidth framerate nframes comptype compnamec @ s6 e Z d Z d Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d! � Z d" d# � Z d$ d% � Z d& d' � Z d( d) � Z d* d+ � Z d, d- � Z d. d/ � Z d0 d1 � Z d S)2� Aifc_readNc C s� d | _ d | _ g | _ d | _ | | _ t | � } | j � d k rW t d � � | j d � } | d k r~ d | _ n$ | d k r� d | _ n t d � � d | _ x� d | _ y t | j � } Wn t k r� PYn X| j � } | d k r| j | � d | _ ng | d k rA| | _ | j d � } d | _ n7 | d k r_t | � | _ n | d k rx| j | � | j � q� W| j s�| j r�t d � � 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�_filer; Zgetnamer r �_aifcZ_comm_chunk_read�_ssnd_seek_neededr �_read_comm_chunk� _ssnd_chunkr � _readmark�skip)�selfr �chunkZformdataZ chunknamer r r r �initfp+ sH zAifc_read.initfpc C s^ t | t � rM t j | d � } y | j | � WqZ | j � � YqZ Xn | j | � d S)N�rb)� isinstance�str�builtinsr rM �close)rK r! � file_objectr r r �__init__R s zAifc_read.__init__c C s | S)Nr )rK r r r � __enter__^ s zAifc_read.__enter__c G s | j � d S)N)rR )rK �argsr r r �__exit__a s zAifc_read.__exit__c C s | j S)N)rD )rK r r r �getfpg s zAifc_read.getfpc C s d | _ d | _ d S)Nr r )rF rC )rK r r r �rewindj s zAifc_read.rewindc C s, | j } | d k r( d | _ | j � d S)N)rD rR )rK r r r r rR n s zAifc_read.closec C s | j S)N)rC )rK r r r �tellt s zAifc_read.tellc C s | j S)N)� _nchannels)rK r r r � getnchannelsw s zAifc_read.getnchannelsc C s | j S)N)�_nframes)rK r r r � getnframesz s zAifc_read.getnframesc C s | j S)N)� _sampwidth)rK r r r � getsampwidth} s zAifc_read.getsampwidthc C s | j S)N)� _framerate)rK r r r � getframerate� s zAifc_read.getframeratec C s | j S)N)� _comptype)rK r r r � getcomptype� s zAifc_read.getcomptypec C s | j S)N)� _compname)rK r r r � getcompname� s zAifc_read.getcompnamec C s= t | j � | j � | j � | j � | j � | j � � S)N)r= r\ r` rb r^ rd rf )rK r r r � getparams� s zAifc_read.getparamsc C s t | j � d k r d S| j S)Nr )r0 rB )rK r r r � getmarkers� s zAifc_read.getmarkersc C sA x% | j D] } | | d k r | Sq Wt d j | � � � d S)Nr zmarker {0!r} does not exist)rB r �format)rK �id�markerr r r �getmark� s zAifc_read.getmarkc C s= | d k s | | j k r' t d � � | | _ d | _ d S)Nr zposition not in ranger )r] r rC rF )rK �posr r r �setpos� s zAifc_read.setposc C s� | j r^ | j j d � | j j d � } | j | j } | rU | j j | d � d | _ | d k rn d S| j j | | j � } | j r� | r� | j | � } | j t | � | j | j | _ | S)Nr r? r ) rF rH �seekr rC � _framesizerA r0 r[ r_ )rK �nframesr rm r r r r � readframes� s zAifc_read.readframesc C s d d l } | j | d � S)Nr r )�audioopZalaw2lin)rK r rs r r r � _alaw2lin� s zAifc_read._alaw2linc C s d d l } | j | d � S)Nr r )rs Zulaw2lin)rK r rs r r r � _ulaw2lin� s zAifc_read._ulaw2linc C sI d d l } t | d � s$ d | _ | j | d | j � \ } | _ | S)Nr � _adpcmstater )rs �hasattrrv Z adpcm2lin)rK r rs r r r � _adpcm2lin� s !zAifc_read._adpcm2linc C s� t | � | _ t | � | _ t | � d d | _ t t | � � | _ | j | j | _ | j r�d } | j d k r� d } t j d � d | _ | j d � | _ | rt | j j d � � } | d @d k r� | d } | j | | _ | j j d d � t | � | _ | j d k r�| j d k r@| j | _ nH | j d k r^| j | _ n* | j d k r|| j | _ n t d � � 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 )r| r} )r~ r )r r[ r r] r_ r9 r& ra rp rE � chunksize�warnings�warnr rc r r ro r re rx rA ru rt r )rK rL Zkludger r r r rG � s< zAifc_read._read_comm_chunkc C s� t | � } yd x] t | � D]O } t | � } t | � } t | � } | sR | r | j j | | | f � q WWnV t k r� d t | j � t | j � d k r� d n d | f } t j | � Yn Xd S)Nz;Warning: MARK chunk contains only %s marker%s instead of %sr � r2 ) r �ranger r rB �appendr r0 r� r� )rK rL Znmarkers�irj rm �name�wr r r rI � s ! * zAifc_read._readmark) r r r rD rM rT rU rW rX rY rR rZ r\ r^ r` rb rd rf rg rh rl rn rr rt ru rx rG rI r r r r r> s2 $ ' &r> c @ s� e Z d Z d Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d! � Z d" d# � Z d$ d% � Z d& d' � Z d( d) � Z d* d+ � Z d, d- � Z d. d/ � Z d0 d1 � Z d2 d3 � Z d4 d5 � Z d6 d7 � Z d8 d9 � Z d: d; � Z d< d= � Z! d> d? � Z" d@ dA � Z# dB dC � Z$ dD dE � Z% dF dG � Z& dH dI � Z' d S)J� Aifc_writeNc C sv t | t � re t j | d � } y | j | � Wn | j � � Yn X| j d � rr d | _ n | j | � d S)N�wbz.aiffr )rO rP rQ r rM rR �endswithrE )rK r! rS r r r rT ! 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 )rD � _AIFC_versionr@ rc re rA r[ r_ ra r] �_nframeswritten� _datawritten� _datalengthrB � _marklengthrE )rK r r r r rM 1 s zAifc_write.initfpc C s | j � d S)N)rR )rK r r r �__del__B s zAifc_write.__del__c C s | S)Nr )rK r r r rU E s zAifc_write.__enter__c G s | j � d S)N)rR )rK rV r r r rW H s zAifc_write.__exit__c C s" | j r t d � � d | _ d S)Nz0cannot change parameters after starting to writer )r� r rE )rK r r r �aiffN s zAifc_write.aiffc C s" | j r t d � � d | _ d S)Nz0cannot change parameters after starting to writer )r� r rE )rK r r r �aifcS s zAifc_write.aifcc C s: | j r t d � � | d k r- t d � � | | _ d S)Nz0cannot change parameters after starting to writer zbad # of channels)r� r r[ )rK � nchannelsr r r � setnchannelsX s zAifc_write.setnchannelsc C s | j s t d � � | j S)Nznumber of channels not set)r[ r )rK r r r r\ _ s zAifc_write.getnchannelsc C sF | j r t d � � | d k s- | d k r9 t d � � | | _ d S)Nz0cannot change parameters after starting to writer r zbad sample width)r� r r_ )rK � sampwidthr r r � setsampwidthd s zAifc_write.setsampwidthc C s | j s t d � � | j S)Nzsample width not set)r_ r )rK r r r r` k s zAifc_write.getsampwidthc C s: | j r t d � � | d k r- t d � � | | _ d S)Nz0cannot change parameters after starting to writer zbad frame rate)r� r ra )rK � framerater r r � setframeratep s zAifc_write.setframeratec C s | j s t d � � | j S)Nzframe rate not set)ra r )rK r r r rb w s zAifc_write.getframeratec C s" | j r t d � � | | _ d S)Nz0cannot change parameters after starting to write)r� r r] )rK rq r r r � setnframes| s zAifc_write.setnframesc C s | j S)N)r� )rK r r r r^ � s zAifc_write.getnframesc C sC | j r t d � � | d k r- t d � � | | _ | | _ 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 rc re )rK �comptype�compnamer r r � setcomptype� s zAifc_write.setcomptypec C s | j S)N)rc )rK r r r rd � s zAifc_write.getcomptypec C s | j S)N)re )rK r r r rf � s zAifc_write.getcompnamec C s� | \ } } } } } } | j r- t d � � | d k rE t d � � | 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� )rK �paramsr� r� r� rq r� r� r r r � setparams� s zAifc_write.setparamsc C sU | j s | j s | j r* t d � � t | j | j | j | j | j | j � S)Nznot all parameters set)r[ r_ ra r r= r] rc re )rK r r r rg � s zAifc_write.getparamsc C s� | d k r t d � � | d k r0 t d � � t | t � sK t d � � xN t t | j � � D]7 } | | j | d k ra | | | f | j | <d Sqa W| j j | | | f � d S)Nr zmarker ID must be > 0z marker position must be >= 0zmarker name must be bytes)r rO �bytesr� r0 rB r� )rK rj rm r� r� r r r �setmark� s zAifc_write.setmarkc C sA x% | j D] } | | d k r | Sq Wt d j | � � � d S)Nr zmarker {0!r} does not exist)rB r ri )rK rj rk r r r rl � s zAifc_write.getmarkc C s t | j � d k r d S| j S)Nr )r0 rB )rK r r r rh � s zAifc_write.getmarkersc C s | j S)N)r� )rK r r r rZ � s zAifc_write.tellc C s� t | t t f � s* t | � j d � } | j t | � � t | � | j | j } | j ro | j | � } | j j | � | j | | _ | j t | � | _ d S)Nr/ )rO r� � bytearray� memoryview�cast�_ensure_header_writtenr0 r_ r[ rA rD r' r� r� )rK r rq r r r �writeframesraw� s zAifc_write.writeframesrawc C s? | j | � | j | j k s1 | j | j k r; | j � d S)N)r� r� r] r� r� � _patchheader)rK r r r r � writeframes� s zAifc_write.writeframesc C s� | j d k r d Sz | j d � | j d @rP | j j d � | j d | _ | j � | j | j k s� | j | j k s� | j r� | j � Wd d | _ | j } d | _ | j � Xd S)Nr r s ) rD r� r� r' � _writemarkersr� r] r� r� r� rA rR )rK r! r r r rR � s zAifc_write.closec C s d d l } | j | d � S)Nr r )rs Zlin2alaw)rK r rs r r r � _lin2alaw� s zAifc_write._lin2alawc C s d d l } | j | d � S)Nr r )rs Zlin2ulaw)rK r rs r r r � _lin2ulaw� s zAifc_write._lin2ulawc C sI d d l } t | d � s$ d | _ | j | d | j � \ } | _ | S)Nr rv r )rs rw rv Z lin2adpcm)rK r rs r r r � _lin2adpcm� s !zAifc_write._lin2adpcmc C s� | j s� | j d k rE | j s* d | _ | j d k rE t d � � | j sZ t d � � | j so t d � � | j s� t d � � | 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� rc r_ r r[ ra � _write_header)rK Zdatasizer r r r� � s z!Aifc_write._ensure_header_writtenc C s[ | j d k r | j | _ n9 | j d k r< | j | _ n | j d k rW | j | _ d S)Ns G722� ulaw� ULAW� alaw� ALAW)r� r� )r� r� )rc r� rA r� r� )rK r r r �_init_compression s z Aifc_write._init_compressionc C s | j r" | j d k r" | j � | j j d � | j sR | | j | j | _ | j | j | j | _ | j d @r� | j d | _ | j r| j d k r� | j d | _ | j d @r| j d | _ n@ | j d k r| j d d | _ | j d @r| j d | _ y | j j � | _ Wn! t t f k rJd | _ Yn X| j | j � } | j r�| j j d � | j j d � t | j d � t | j | j � n | j j d � | j j d � t | j | � t | j | j � | j d k r| j j � | _ t | j | j � | j d k rEt | j d � n t | j | j d � t | j | j � | j r�| j j | j � t | j | j � | j j d � | j d k r�| j j � | _ t | j | j d � t | j d � t | j d � 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� )rE rc r� rD r' r] r[ r_ r� rZ �_form_length_pos�AttributeError�OSError�_write_form_lengthr- r@ r* � _nframes_posr: ra r3 re �_ssnd_length_pos)rK Z initlength� commlengthr r r r� s^ zAifc_write._write_headerc C st | j r9 d t | j � } | d @r0 | d } d } n d } d } t | j d | | j d | d | � | S) Nrz � r � r r r? � r{ )rE r0 re r- rD r� )rK � datalengthr� Z verslengthr r r r� J s "z Aifc_write._write_form_lengthc C s0 | j j � } | j d @r< | j d } | j j d � n | j } | | j k r� | j | j k r� | j d k r� | 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 s r r? )rD rZ r� r' r� r] r� r� ro r� r� r� r- r� )rK Zcurposr� r r r r r� W s& zAifc_write._patchheaderc C s t | j � d k r d S| j j d � d } xX | j D]M } | \ } } } | t | � d d } t | � d @d k r9 | d } q9 Wt | j | � | d | _ t | j t | j � � xP | j D]E } | \ } } } t | j | � t | j | � t | j | � q� Wd S)Nr s MARKr r � r? )r0 rB rD r' r- r� r* r3 )rK r rk rj rm r� r r r r� m s" zAifc_write._writemarkers)(r r r rD rT rM r� rU rW r� r� r� r\ r� r` r� rb r� r^ r� rd rf r� rg r� rl rh rZ r� r� rR r� r� r� r� r� r� r� r� r� r r r r r� sJ 3 r� c C si | d k r- t | d � r' | j } n d } | d k rC t | � S| d k rY t | � St d � � d S) N�moderN �rr� r� z$mode must be 'r', 'rb', 'w', or 'wb')r� rN )r� r� )rw 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.)1r rQ r� �__all__� Exceptionr r� r r r r r r r& r* r+ r, r- r3 r: rL r; � collectionsr< r= r> r� r r r �sys�argvr� �fnr! �printr\ r^ r` rb rd rf Zgn�gr� rg rr r r� r r r r �<module>� sf ! �� �
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