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Edit File: aifc.cpython-33.pyc
� �� fNy c @ s� d Z d d l Z d d l Z d d l Z d d d g Z Gd d � d e � Z d Z d d � Z d d � Z d d � Z d d � Z d 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! l m Z Gd" d# � d# � Z Gd$ d% � d% � Z e d& d � Z e Z e d' k r�d d l Z e j d( d � rue j j d) � n e j d( Z e e d* � Z! z e" d+ e � e" d, e! j# � � e" d- e! j$ � � e" d. e! j% � � e" d/ e! j& � � e" d0 e! j' � � e" d1 e! j( � � e j d2 d � r�e j d2 Z) e" d3 e) � e e) d4 � Z* zD e* j+ e! j, � � x* e! j- d5 � Z. e. r�Pn e* j/ e. � qhWd e* j0 � Xe" d6 � n Wd e! j0 � Xn d S(7 uD 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 | +-----------------+ | <size> | +----+------------+ | | AIFC | | +------------+ | | <chunks> | | | . | | | . | | | . | +----+------------+ 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 <version number of AIFF-C defining document> (AIFF-C only). MARK <# of markers> (2 bytes) list of markers: <marker ID> (2 bytes, must be > 0) <position> (4 bytes) <marker name> ("pstring") COMM <# of channels> (2 bytes) <# of sound frames> (4 bytes) <size of the samples> (2 bytes) <sampling frequency> (10 bytes, IEEE 80-bit extended floating point) in AIFF-C files only: <compression type> (4 bytes) <human-readable version of compression type> ("pstring") SSND <offset> (4 bytes, not used by this program) <blocksize> (4 bytes, not used by this program) <sound data> 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 tuple 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('') 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. 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� 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- S(. u Aifc_readc C s� d | _ d | _ g | _ d | _ | | _ t | � } | j � d k rZ t d � � n | 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 | _ nj | d k rD| | _ | j d � } d | _ n: | d k rbt | � | _ n | d k r~| j | � n | j � q� | j s�| j r�t d � � n d S( Ni s FORMu file does not start with FORM idi s AIFFs AIFCi u not an AIFF or AIFF-C files COMMs SSNDi s FVERs MARKu$ COMM chunk and/or SSND chunk missing( u _versionu Noneu _convertu _markersu _soundposu _fileu Chunku getnameu Erroru readu _aifcu _comm_chunk_readu _ssnd_seek_neededu EOFErroru _read_comm_chunku _ssnd_chunku _read_ulongu _readmarku skip( u selfu fileu chunku formdatau chunknameu dummy( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu initfp$ sH u Aifc_read.initfpc C s5 t | t � r$ t j | d � } n | j | � d S( Nu rb( u isinstanceu stru builtinsu openu initfp( u selfu f( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu __init__K s u Aifc_read.__init__c C s | j S( N( u _file( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getfpT s u Aifc_read.getfpc C s d | _ d | _ d S( Ni i ( u _ssnd_seek_neededu _soundpos( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu rewindW s u Aifc_read.rewindc C s | j j � d S( N( u _fileu close( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu close[ s u Aifc_read.closec C s | j S( N( u _soundpos( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu tell^ s u Aifc_read.tellc C s | j S( N( u _nchannels( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getnchannelsa s u Aifc_read.getnchannelsc C s | j S( N( u _nframes( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getnframesd s u Aifc_read.getnframesc C s | j S( N( u _sampwidth( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getsampwidthg s 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s� t | � } yg x` t | � D]R } t | � } t | � } t | � } | sR | r | j j | | | f � q q WWnV t k r� d t | j � t | j � d k r� d n d | f } t j | � Yn Xd S( Nu; Warning: MARK chunk contains only %s marker%s instead of %si u u s( u _read_shortu rangeu _read_longu _read_stringu _markersu appendu EOFErroru lenu warningsu warn( u selfu chunku nmarkersu iu idu posu nameu w( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _readmark� s $ * u Aifc_read._readmarkN( u __name__u __module__u __qualname__u initfpu __init__u getfpu rewindu closeu tellu getnchannelsu getnframesu getsampwidthu getframerateu getcomptypeu getcompnameu getparamsu getmarkersu getmarku setposu readframesu _alaw2linu _ulaw2linu _adpcm2linu _read_comm_chunku _readmark( u __locals__( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu Aifc_read s, $ ' &u Aifc_readc B s� | Ee 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 d/ d0 � Z d1 d2 � Z d3 d4 � Z d5 d6 � Z d7 d8 � Z d9 d: � Z d; d< � Z d= d> � Z! d? d@ � Z" dA dB � Z# dC dD � Z$ dE S(F u Aifc_writec C sl t | t � r* | } t j | d � } n d } | j | � | d d � d k r_ d | _ n d | _ d S( Nu wbu ???i u .aiffi i i����( u isinstanceu stru builtinsu openu initfpu _aifc( u selfu fu filename( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu __init__ s u Aifc_write.__init__c C s� | | _ t | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ d | _ g | _ d | _ d | _ d S( Ns NONEs not compressedi i ( u _fileu _AIFC_versionu _versionu _comptypeu _compnameu Noneu _convertu _nchannelsu _sampwidthu _framerateu _nframesu _nframeswrittenu _datawrittenu _datalengthu _markersu _marklengthu _aifc( u selfu file( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu initfp s u Aifc_write.initfpc C s | j � d S( N( u close( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu __del__' s u Aifc_write.__del__c C s% | j r t d � � n d | _ d S( Nu0 cannot change parameters after starting to writei ( u _nframeswrittenu Erroru _aifc( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu aiff- s u Aifc_write.aiffc C s% | j r t d � � n d | _ d S( Nu0 cannot change parameters after starting to writei ( u _nframeswrittenu Erroru _aifc( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu aifc2 s u Aifc_write.aifcc C s@ | j r t d � � n | d k r3 t d � � n | | _ d S( Nu0 cannot change parameters after starting to writei u bad # of channels( u _nframeswrittenu Erroru _nchannels( u selfu nchannels( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setnchannels7 s u Aifc_write.setnchannelsc C s | j s t d � � n | j S( Nu number of channels not set( u _nchannelsu Error( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getnchannels> s u Aifc_write.getnchannelsc C sL | j r t d � � n | d k s0 | d k r? t d � � n | | _ d S( Nu0 cannot change parameters after starting to writei i u bad sample width( u _nframeswrittenu Erroru _sampwidth( u selfu sampwidth( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setsampwidthC s u Aifc_write.setsampwidthc C s | j s t d � � n | j S( Nu sample width not set( u _sampwidthu Error( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getsampwidthJ s u Aifc_write.getsampwidthc C s@ | j r t d � � n | d k r3 t d � � n | | _ d S( Nu0 cannot change parameters after starting to writei u bad frame rate( u _nframeswrittenu Erroru _framerate( u selfu framerate( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setframerateO s u Aifc_write.setframeratec C s | j s t d � � n | j S( Nu frame rate not set( u _framerateu Error( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getframerateV s u Aifc_write.getframeratec C s% | j r t d � � n | | _ d S( Nu0 cannot change parameters after starting to write( u _nframeswrittenu Erroru _nframes( u selfu nframes( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setnframes[ s u Aifc_write.setnframesc C s | j S( N( u _nframeswritten( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getnframes` s u Aifc_write.getnframesc C sI | j r t d � � n | d k r3 t d � � n | | _ | | _ d S( Nu0 cannot change parameters after starting to writes NONEs ulaws ULAWs alaws ALAWs G722u unsupported compression type( s NONEs ulaws ULAWs alaws ALAWs G722( u _nframeswrittenu Erroru _comptypeu _compname( u selfu comptypeu compname( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setcomptypec s u Aifc_write.setcomptypec C s | j S( N( u _comptype( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getcomptypel s u Aifc_write.getcomptypec C s | j S( N( u _compname( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getcompnameo s u Aifc_write.getcompnamec C s� | \ } } } } } } | j r0 t d � � n | d k rK t d � � n | j | � | j | � | j | � | j | � | j | | � d S( Nu0 cannot change parameters after starting to writes NONEs ulaws ULAWs alaws ALAWs G722u unsupported compression type( s NONEs ulaws ULAWs alaws ALAWs G722( u _nframeswrittenu Erroru setnchannelsu setsampwidthu setframerateu setnframesu setcomptype( u selfu paramsu nchannelsu sampwidthu framerateu nframesu comptypeu compname( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setparamsw s u Aifc_write.setparamsc C sU | j s | j s | j r- t d � � n | j | j | j | j | j | j f S( Nu not all parameters set( u _nchannelsu _sampwidthu _framerateu Erroru _nframesu _comptypeu _compname( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getparams� s u Aifc_write.getparamsc C s� | d k r t d � � n | d k r6 t d � � n t | t � sT t d � � n xN t t | j � � D]7 } | | j | d k rj | | | f | j | <d Sqj W| j j | | | f � d S( Ni u marker ID must be > 0u marker position must be >= 0u marker name must be bytes( u Erroru isinstanceu bytesu rangeu lenu _markersu append( u selfu idu posu nameu i( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu setmark� s u Aifc_write.setmarkc C sA x% | j D] } | | d k r | Sq Wt d j | � � � d S( Ni u marker {0!r} does not exist( u _markersu Erroru format( u selfu idu marker( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getmark� s u Aifc_write.getmarkc C s t | j � d k r d S| j S( Ni ( u lenu _markersu None( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu getmarkers� s u Aifc_write.getmarkersc C s | j S( N( u _nframeswritten( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu tell� s u Aifc_write.tellc C s� | j t | � � t | � | j | j } | j rH | j | � } n | j j | � | j | | _ | j t | � | _ d S( N( u _ensure_header_writtenu lenu _sampwidthu _nchannelsu _convertu _fileu writeu _nframeswrittenu _datawritten( u selfu datau nframes( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu writeframesraw� s u Aifc_write.writeframesrawc C sB | j | � | j | j k s1 | j | j k r> | j � n d S( N( u writeframesrawu _nframeswrittenu _nframesu _datalengthu _datawrittenu _patchheader( u selfu data( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu writeframes� s u Aifc_write.writeframesc C s� | j d k r d Sz� | j d � | j d @rS | j j d � | j d | _ n | j � | j | j k s� | j | j k s� | j r� | j � n Wd d | _ | j } d | _ | j � Xd S( Ni i s ( u _fileu Noneu _ensure_header_writtenu _datawrittenu writeu _writemarkersu _nframeswrittenu _nframesu _datalengthu _marklengthu _patchheaderu _convertu close( u selfu f( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu close� s u Aifc_write.closec C s d d l } | j | d � S( Ni i ( u audioopu lin2alaw( u selfu datau audioop( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _lin2alaw� s u Aifc_write._lin2alawc C s d d l } | j | d � S( Ni i ( u audioopu lin2ulaw( u selfu datau audioop( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _lin2ulaw� s u Aifc_write._lin2ulawc C sL d d l } t | d � s' d | _ n | j | d | j � \ } | _ | S( Ni u _adpcmstatei ( u audioopu hasattru Noneu _adpcmstateu lin2adpcm( u selfu datau audioop( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _lin2adpcm� s !u Aifc_write._lin2adpcmc C s� | j s� | j d k rN | j s- d | _ n | j d k rN t d � � qN n | j sf t d � � n | j s~ t d � � n | j s� t d � � n | j | � n d S( Ns ULAWs ulaws ALAWs alaws G722i uR sample width must be 2 when compressing with ulaw/ULAW, alaw/ALAW or G7.22 (ADPCM)u # channels not specifiedu sample width not specifiedu sampling rate not specified( s ULAWs ulaws ALAWs alaws G722( u _nframeswrittenu _comptypeu _sampwidthu Erroru _nchannelsu _framerateu _write_header( u selfu datasize( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _ensure_header_written� s u! Aifc_write._ensure_header_writtenc C s^ | j d k r | j | _ n< | j d k r< | j | _ n | j d k rZ | j | _ n d S( Ns G722s ulaws ULAWs alaws ALAW( s ulaws ULAW( s alaws ALAW( u _comptypeu _lin2adpcmu _convertu _lin2ulawu _lin2alaw( u self( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _init_compression� s u Aifc_write._init_compressionc C s( | j r% | j d k r% | j � n | j j d � | j sX | | j | j | _ n | j | j | j | _ | j d @r� | j d | _ n | j r&| j d k r� | j d | _ | j d @r#| j d | _ q#q&| j d k r&| j d d | _ | j d @r#| j d | _ q#q&n y | j j � | _ Wn! t t f k r_d | _ 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 � | _ n t | j | j � | j d k r]t | j d � n t | j | j d � t | j | j � | j r�| j j | j � t | j | j � n | j j d � | j d k r�| j j � | _ n t | j | j d � t | j d � t | j d � d S( Ns NONEs FORMi s ulaws ULAWs alaws ALAWi s G722i i s AIFCs FVERs AIFFs COMMi s SSNDi ( s ulaws ULAWs alaws ALAW( s ULAWs ulaws ALAWs alaws G722( u _aifcu _comptypeu _init_compressionu _fileu writeu _nframesu _nchannelsu _sampwidthu _datalengthu tellu _form_length_posu AttributeErroru OSErroru Noneu _write_form_lengthu _write_ulongu _versionu _write_shortu _nframes_posu _write_floatu _framerateu _write_stringu _compnameu _ssnd_length_pos( u selfu initlengthu commlength( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _write_header� s^ u Aifc_write._write_headerc C sw | j r< d t | j � } | d @r3 | d } n d } n d } d } t | j d | | j d | d | � | S( Ni i i i i i i i i ( u _aifcu lenu _compnameu _write_ulongu _fileu _marklength( u selfu datalengthu commlengthu verslength( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _write_form_length' s "u 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( Ni s i i ( u _fileu tellu _datawrittenu writeu _datalengthu _nframesu _nframeswrittenu _marklengthu seeku _form_length_posu _write_form_lengthu _nframes_posu _write_ulongu _ssnd_length_pos( u selfu curposu datalengthu dummy( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _patchheader4 s& u Aifc_write._patchheaderc C s t | j � d k r d S| j j d � d } x[ | j D]P } | \ } } } | t | � d d } t | � d @d k r9 | d } q9 q9 Wt | j | � | d | _ t | j t | j � � xP | j D]E } | \ } } } t | j | � t | j | � t | j | � q� Wd S( Ni s MARKi i i i ( u lenu _markersu _fileu writeu _write_ulongu _marklengthu _write_shortu _write_string( u selfu lengthu markeru idu posu name( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu _writemarkersJ s" u Aifc_write._writemarkersN(% u __name__u __module__u __qualname__u __init__u initfpu __del__u aiffu aifcu setnchannelsu getnchannelsu setsampwidthu getsampwidthu setframerateu getframerateu setnframesu getnframesu setcomptypeu getcomptypeu getcompnameu setparamsu getparamsu setmarku getmarku getmarkersu tellu writeframesrawu writeframesu closeu _lin2alawu _lin2ulawu _lin2adpcmu _ensure_header_writtenu _init_compressionu _write_headeru _write_form_lengthu _patchheaderu _writemarkers( u __locals__( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu Aifc_write� sD 3 u Aifc_writec C sl | d k r0 t | d � r' | j } q0 d } n | d k rF t | � S| d k r\ t | � St d � � d S( Nu modeu rbu ru wu wbu$ mode must be 'r', 'rb', 'w', or 'wb'( u ru rb( u wu wb( u Noneu hasattru modeu Aifc_readu Aifc_writeu Error( u fu mode( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu open] s u __main__i u /usr/demos/data/audio/bach.aiffu ru Readingu nchannels =u nframes =u sampwidth =u framerate =u comptype =u compname =i u Writingu wi u Done.(1 u __doc__u structu builtinsu warningsu __all__u Exceptionu Erroru _AIFC_versionu _read_longu _read_ulongu _read_shortu _read_ushortu _read_stringu _HUGE_VALu _read_floatu _write_shortu _write_ushortu _write_longu _write_ulongu _write_stringu _write_floatu chunku Chunku Aifc_readu Aifc_writeu Noneu openu openfpu __name__u sysu argvu appendu fnu fu printu getnchannelsu getnframesu getsampwidthu getframerateu getcomptypeu getcompnameu gnu gu setparamsu getparamsu readframesu datau writeframesu close( ( ( u) /opt/alt/python33/lib64/python3.3/aifc.pyu <module>� sj !�� s
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