usr/lib64/python3.6/__pycache__/aifc.cpython-36.pyc000064400000062531147204633150015621 0ustar003 \~@s>dZddlZddlZddlZdddgZGdddeZdZdd Zd d Z d d Z ddZ ddZ dZ ddZddZddZddZddZddZdd Zdd!lmZdd"lmZed#d$Zd%ej_d&ej_d'ej_d(ej_d)ej_d*ej_Gd+d,d,Z Gd-d.d.Z!d@d/dZ"e"Z#e$d0kr:ddl%Z%e%j&d1dsHe%j&j'd2e%j&d1Z(e"e(d3Z)e*d4e(e*d5e)j+e*d6e)j,e*d7e)j-e*d8e)j.e*d9e)j/e*d:e)j0e%j&d;dr0e%j&d;Z1e*dZ6e6sPe2j7e6qWWdQRXe*d?WdQRXdS)AaJStuff 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 | +-----------------+ | | +----+------------+ | | AIFC | | +------------+ | | | | | . | | | . | | | . | +----+------------+ 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 (AIFF-C only). MARK <# of markers> (2 bytes) list of markers: (2 bytes, must be > 0) (4 bytes) ("pstring") COMM <# of channels> (2 bytes) <# of sound frames> (4 bytes) (2 bytes) (10 bytes, IEEE 80-bit extended floating point) in AIFF-C files only: (4 bytes) ("pstring") SSND (4 bytes, not used by this program) (4 bytes, not used by this program) 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 namedtuple 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(b'') 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. This default can be changed by calling aiff() or aifc() before the first writeframes or writeframesraw. NErroropenopenfpc@s eZdZdS)rN)__name__ __module__ __qualname__rr/usr/lib64/python3.6/aifc.pyrsl@QEc Cs6ytjd|jddStjk r0tYnXdS)Nz>lr)structunpackreaderrorEOFError)filerrr _read_longsrc Cs6ytjd|jddStjk r0tYnXdS)Nz>Lr r)r r r rr)rrrr _read_ulongsrc Cs6ytjd|jddStjk r0tYnXdS)Nz>hr)r r r rr)rrrr _read_shortsrc Cs6ytjd|jddStjk r0tYnXdS)Nz>Hrr)r r r rr)rrrr _read_ushortsrcCs@t|jd}|dkrd}n |j|}|d@dkr<|jd}|S)Nr)ordr )rlengthdatadummyrrr _read_strings   rgcCst|}d}|dkr d }|d}t|}t|}||koL|koLdknrXd}n0|dkrft}n"|d}|d|td|d }||S) Nrrigii?lg@?)rr _HUGE_VALpow)fexponsignhimantlomantrrr _read_floats"r&cCs|jtjd|dS)Nz>h)writer pack)r!xrrr _write_shortsr*cCs|jtjd|dS)Nz>H)r'r r()r!r)rrr _write_ushortsr+cCs|jtjd|dS)Nz>l)r'r r()r!r)rrr _write_longsr,cCs|jtjd|dS)Nz>L)r'r r()r!r)rrr _write_ulongsr-cCsRt|dkrtd|jtjdt||j|t|d@dkrN|jddS)Nz%string exceeds maximum pstring lengthBrr)len ValueErrorr'r r()r!srrr _write_strings   r4c Csddl}|dkrd}|d}nd}|dkr8d}d}d}n|j|\}}|dks^|dks^||krp|dB}d}d}nh|d}|dkr|j||}d}||B}|j|d}|j|}t|}|j||d}|j|}t|}t||t||t||dS) Nriri@ii? r)mathZfrexpZldexpZfloorintr+r-) r!r)r6r#r"r$r%ZfmantZfsmantrrr _write_floats8       r8)Chunk) namedtuple _aifc_paramsz7nchannels sampwidth framerate nframes comptype compnamez3Number of audio channels (1 for mono, 2 for stereo)zSample width in byteszSampling frequencyzNumber of audio framesz(Compression type ("NONE" for AIFF files)zRA human-readable version of the compression type ('not compressed' for AIFF files)c@seZdZdZddZddZddZdd Zd d Zd d Z ddZ ddZ ddZ ddZ ddZddZddZddZddZd d!Zd"d#Zd$d%Zd&d'Zd(d)Zd*d+Zd,d-Zd.d/Zd0d1ZdS)2 Aifc_readNc Cs<d|_d|_g|_d|_||_t|}|jdkr:td|jd}|dkrTd|_ n|dkrdd|_ ntdd|_ d|_ xd|_ yt|j}Wnt k rPYnX|j}|d kr|j|d|_ nH|d kr||_ |jd }d|_ n(|d krt||_n|d kr|j||jqzW|j s0|j r8tddS)NrsFORMz file does not start with FORM idr sAIFFsAIFCrznot an AIFF or AIFF-C filesCOMMsSSNDsFVERsMARKz$COMM chunk and/or SSND chunk missing)_version_convert_markers _soundpos_filer9Zgetnamerr _aifcZ_comm_chunk_read _ssnd_chunk_ssnd_seek_neededr_read_comm_chunkr _readmarkskip)selfrchunkZformdataZ chunknamerrrr initfp4sJ        zAifc_read.initfpc CsLt|tr>tj|d}y|j|WqH|jYqHXn |j|dS)Nrb) isinstancestrbuiltinsrrKclose)rIr! file_objectrrr __init__\s   zAifc_read.__init__cCs|S)Nr)rIrrr __enter__hszAifc_read.__enter__cGs |jdS)N)rP)rIargsrrr __exit__kszAifc_read.__exit__cCs|jS)N)rB)rIrrr getfpqszAifc_read.getfpcCsd|_d|_dS)Nrr)rErA)rIrrr rewindtszAifc_read.rewindcCs |j}|dk rd|_|jdS)N)rBrP)rIrrrr rPxszAifc_read.closecCs|jS)N)rA)rIrrr tell~szAifc_read.tellcCs|jS)N) _nchannels)rIrrr getnchannelsszAifc_read.getnchannelscCs|jS)N)_nframes)rIrrr getnframesszAifc_read.getnframescCs|jS)N) _sampwidth)rIrrr getsampwidthszAifc_read.getsampwidthcCs|jS)N) _framerate)rIrrr getframerateszAifc_read.getframeratecCs|jS)N) _comptype)rIrrr getcomptypeszAifc_read.getcomptypecCs|jS)N) _compname)rIrrr getcompnameszAifc_read.getcompnamecCs*t|j|j|j|j|j|jS)N)r;rZr^r`r\rbrd)rIrrr getparamss zAifc_read.getparamscCst|jdkrdS|jS)Nr)r1r@)rIrrr getmarkersszAifc_read.getmarkerscCs2x|jD]}||dkr|SqWtdj|dS)Nrzmarker {0!r} does not exist)r@rformat)rIidmarkerrrr getmarks  zAifc_read.getmarkcCs*|dks||jkrtd||_d|_dS)Nrzposition not in ranger)r[rrArE)rIposrrr setposszAifc_read.setposcCs|jrD|jjd|jjd}|j|j}|r>|jj|dd|_|dkrPdS|jj||j}|jrv|rv|j|}|jt||j|j |_|S)Nrr=r) rErDseekr rA _framesizer?r1rYr])rInframesrrkrrrr readframess     zAifc_read.readframescCsddl}|j|dS)Nrr)audioopZalaw2lin)rIrrqrrr _alaw2linszAifc_read._alaw2lincCsddl}|j|dS)Nrr)rqZulaw2lin)rIrrqrrr _ulaw2linszAifc_read._ulaw2lincCs2ddl}t|dsd|_|j|d|j\}|_|S)Nr _adpcmstater)rqhasattrrtZ adpcm2lin)rIrrqrrr _adpcm2lins  zAifc_read._adpcm2lincCs.t||_t||_t|dd|_tt||_|j|j|_|j rd}|j dkrld}t j dd|_ |j d|_|rt|jj d}|d@dkr|d}|j ||_ |jjddt||_|jd kr*|jd kr|j|_n2|jdkr|j|_n|jdkr|j|_ntdd|_n d |_d|_dS)Nr=rrzWarning: bad COMM chunk sizer sNONEsG722ulawULAWalawALAWzunsupported compression typersnot compressedr)rzr{)r|r})rrYrr[r]r7r&r_rnrCZ chunksizewarningswarnr rarrrmrrcrvr?rsrrr)rIrJZkludgerrrr rFs<               zAifc_read._read_comm_chunkc Cst|}yHxBt|D]6}t|}t|}t|}|s8|r|jj|||fqWWnDtk rdt|jt|jdkr|dnd|f}tj |YnXdS)Nz;Warning: MARK chunk contains only %s marker%s instead of %srr3) rrangerrr@appendrr1r~r)rIrJZnmarkersirhrknamewrrr rGszAifc_read._readmark)rrrrBrKrRrSrUrVrWrPrXrZr\r^r`rbrdrerfrjrlrprrrsrvrFrGrrrr r<s2$( &r<c@s0eZdZdZddZddZddZdd Zd d Zd d Z ddZ ddZ ddZ ddZ ddZddZddZddZddZd d!Zd"d#Zd$d%Zd&d'Zd(d)Zd*d+Zd,d-Zd.d/Zd0d1Zd2d3Zd4d5Zd6d7Zd8d9Zd:d;Z dd?Z"d@dAZ#dBdCZ$dDdEZ%dFdGZ&dHdIZ'dS)J Aifc_writeNc Cs\t|trNtj|d}y|j|Wn|jYnX|jdrXd|_n |j|dS)Nwbz.aiffr)rMrNrOrrKrPendswithrC)rIr!rQrrr rR+s   zAifc_write.__init__cCs^||_t|_d|_d|_d|_d|_d|_d|_d|_ d|_ d|_ d|_ g|_ d|_d|_dS)NsNONEsnot compressedrr)rB _AIFC_versionr>rarcr?rYr]r_r[_nframeswritten _datawritten _datalengthr@ _marklengthrC)rIrrrr rK;szAifc_write.initfpcCs |jdS)N)rP)rIrrr __del__LszAifc_write.__del__cCs|S)Nr)rIrrr rSOszAifc_write.__enter__cGs |jdS)N)rP)rIrTrrr rURszAifc_write.__exit__cCs|jrtdd|_dS)Nz0cannot change parameters after starting to writer)rrrC)rIrrr aiffXszAifc_write.aiffcCs|jrtdd|_dS)Nz0cannot change parameters after starting to writer)rrrC)rIrrr aifc]szAifc_write.aifccCs(|jrtd|dkrtd||_dS)Nz0cannot change parameters after starting to writerzbad # of channels)rrrY)rI nchannelsrrr setnchannelsbs zAifc_write.setnchannelscCs|jstd|jS)Nznumber of channels not set)rYr)rIrrr rZiszAifc_write.getnchannelscCs0|jrtd|dks|dkr&td||_dS)Nz0cannot change parameters after starting to writerr zbad sample width)rrr])rI sampwidthrrr setsampwidthns zAifc_write.setsampwidthcCs|jstd|jS)Nzsample width not set)r]r)rIrrr r^uszAifc_write.getsampwidthcCs(|jrtd|dkrtd||_dS)Nz0cannot change parameters after starting to writerzbad frame rate)rrr_)rI frameraterrr setframeratezs zAifc_write.setframeratecCs|jstd|jS)Nzframe rate not set)r_r)rIrrr r`szAifc_write.getframeratecCs|jrtd||_dS)Nz0cannot change parameters after starting to write)rrr[)rIrorrr setnframesszAifc_write.setnframescCs|jS)N)r)rIrrr r\szAifc_write.getnframescCs.|jrtd|d krtd||_||_dS) Nz0cannot change parameters after starting to writeNONEulawULAWalawALAWG722zunsupported compression type)rrrrrr)rrrarc)rIcomptypecompnamerrr setcomptypeszAifc_write.setcomptypecCs|jS)N)ra)rIrrr rbszAifc_write.getcomptypecCs|jS)N)rc)rIrrr rdszAifc_write.getcompnamecCsf|\}}}}}}|jrtd|d kr.td|j||j||j||j||j||dS) Nz0cannot change parameters after starting to writeNONEulawULAWalawALAWG722zunsupported compression type)rrrrrr)rrrrrrr)rIZparamsrrrrorrrrr setparamss    zAifc_write.setparamscCs>|j s|j s|j r tdt|j|j|j|j|j|jS)Nznot all parameters set)rYr]r_rr;r[rarc)rIrrr reszAifc_write.getparamscCs|dkrtd|dkr tdt|ts2tdx 0zmarker position must be >= 0zmarker name must be bytes)rrMbytesrr1r@r)rIrhrkrrrrr setmarks zAifc_write.setmarkcCs2x|jD]}||dkr|SqWtdj|dS)Nrzmarker {0!r} does not exist)r@rrg)rIrhrirrr rjs  zAifc_write.getmarkcCst|jdkrdS|jS)Nr)r1r@)rIrrr rfszAifc_write.getmarkerscCs|jS)N)r)rIrrr rXszAifc_write.tellcCszt|ttfst|jd}|jt|t||j|j}|j rN|j |}|j j ||j ||_ |j t||_ dS)Nr/)rMr bytearray memoryviewcast_ensure_header_writtenr1r]rYr?rBr'rr)rIrrorrr writeframesraws   zAifc_write.writeframesrawcCs.|j||j|jks"|j|jkr*|jdS)N)rrr[rr _patchheader)rIrrrr writeframess   zAifc_write.writeframesc Cs|jdkrdSz^|jd|jd@r<|jjd|jd|_|j|j|jksb|j|jksb|jrj|j Wdd|_ |j}d|_|j XdS)Nrrr0) rBrrr' _writemarkersrr[rrrr?rP)rIr!rrr rPs         zAifc_write.closecCsddl}|j|dS)Nrr)rqZlin2alaw)rIrrqrrr _lin2alawszAifc_write._lin2alawcCsddl}|j|dS)Nrr)rqZlin2ulaw)rIrrqrrr _lin2ulawszAifc_write._lin2ulawcCs2ddl}t|dsd|_|j|d|j\}|_|S)Nrrtr)rqrurtZ lin2adpcm)rIrrqrrr _lin2adpcms  zAifc_write._lin2adpcmcCsf|jsb|jd kr.|jsd|_|jdkr.td|js|jdkr|j|_n&|jdkr(|j|_n|jdkr:|j|_dS)NsG722ulawULAWalawALAW)rr)rr)rarr?rr)rIrrr _init_compressions      zAifc_write._init_compressioncCsL|jr|jdkr|j|jjd|js<||j|j|_|j|j|j|_|jd@rf|jd|_|jr|jdkr|jd|_|jd@r|jd|_n0|jd kr|jd d |_|jd@r|jd|_y|jj |_ Wn t t fk rd|_ YnX|j |j}|jrD|jjd |jjd t|jd t|j|jn |jjd|jjdt|j|t|j|j|j dk r|jj |_t|j|j|jdkrt|jdnt|j|jdt|j|j|jr|jj|jt|j|j|jjd|j dk r|jj |_t|j|jdt|jdt|jddS)NsNONEsFORMrulawULAWalawALAWrG722r sAIFCsFVERsAIFFsCOMMr=sSSNDr)rrrr)rrrrr)rCrarrBr'r[rYr]rrX_form_length_posAttributeErrorOSError_write_form_lengthr-r>r* _nframes_posr8r_r4rc_ssnd_length_pos)rIZ initlength commlengthrrr r!s^                        zAifc_write._write_headercCs\|jr*d t|j}|d@r$|d}d}nd}d}t|jd||jd|d||S) Nrxr rr r=ry)rCr1rcr-rBr)rI datalengthrZ verslengthrrr rTs zAifc_write._write_form_lengthcCs|jj}|jd@r,|jd}|jjdn|j}||jkrd|j|jkrd|jdkrd|jj|ddS|jj|j d|j |}|jj|j dt |j|j|jj|j dt |j|d|jj|d|j|_||_dS)Nrr0rr=)rBrXrr'rr[rrrmrrrr-r)rIZcurposrrrrr ras&       zAifc_write._patchheadercCst|jdkrdS|jjdd}xD|jD]:}|\}}}|t|dd}t|d@dkr*|d}q*Wt|j||d|_t|jt|jx<|jD]2}|\}}}t|j|t|j|t|j|qWdS)NrsMARKrrr=)r1r@rBr'r-rr*r4)rIrrirhrkrrrr rws"          zAifc_write._writemarkers)(rrrrBrRrKrrSrUrrrrZrr^rr`rr\rrbrdrrerrjrfrXrrrPrrrrrrrrrrrrr r sJ    3 rcCsJ|dkrt|dr|j}nd}|dkr.t|S|dkr>t|StddS) NmoderLrrrz$mode must be 'r', 'rb', 'w', or 'wb')rrL)rr)rurr<rr)r!rrrr rs __main__rz/usr/demos/data/audio/bach.aiffrZReadingz nchannels =z nframes =z sampwidth =z framerate =z comptype =z compname =rZWritingrizDone.)N)8__doc__r rOr~__all__ Exceptionrrrrrrrrr&r*r+r,r-r4r8rJr9 collectionsr:r;rrrrorrr<rrrrsysargvrfnr!printrZr\r^r`rbrdZgngrrerprrrrrr sz  !  ~