ó ^ bc@sÖdZdZdZdZdZdZdZdZdZd Z d Z d Z d Z d Z dZeeeeee gZdefd„ƒYZd„Zd„Zddd„ƒYZddd„ƒYZdd„ZeZdS(sÔStuff to parse Sun and NeXT audio files. An audio file consists of a header followed by the data. The structure of the header is as follows. +---------------+ | magic word | +---------------+ | header size | +---------------+ | data size | +---------------+ | encoding | +---------------+ | sample rate | +---------------+ | # of channels | +---------------+ | info | | | +---------------+ The magic word consists of the 4 characters '.snd'. Apart from the info field, all header fields are 4 bytes in size. They are all 32-bit unsigned integers encoded in big-endian byte order. The header size really gives the start of the data. The data size is the physical size of the data. From the other parameters the number of frames can be calculated. The encoding gives the way in which audio samples are encoded. Possible values are listed below. The info field currently consists of an ASCII string giving a human-readable description of the audio file. The info field is padded with NUL bytes to the header size. Usage. Reading audio files: f = sunau.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(). When the setpos() and rewind() methods are 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' or 'ULAW') getcompname() -- returns human-readable version of compression type ('not compressed' matches 'NONE') getparams() -- returns a tuple consisting of all of the above in the above order getmarkers() -- returns None (for compatibility with the aifc module) getmark(id) -- raises an error since the mark does not exist (for compatibility with the aifc module) 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() and the position given to setpos() are 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 audio files: f = sunau.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: 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 tell() -- return current position in output file 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. The close() method is called automatically when the class instance is destroyed. idns.iiiiiiiiiiiil˙˙tErrorcBseZRS((t__name__t __module__(((s*/opt/alt/python27/lib64/python2.7/sunau.pyRƒscCsYd}xLtdƒD]>}|jdƒ}|dkr=t‚n|dt|ƒ}qW|S(Nliiti(trangetreadtEOFErrortord(tfiletxtitbyte((s*/opt/alt/python27/lib64/python2.7/sunau.pyt _read_u32†s  cCs€g}x?tdƒD]1}t|dƒ\}}|jd|ƒ|}qWx1tdƒD]#}|jtt||ƒƒƒqUWdS(Niii(Rtdivmodtinserttwritetchrtint(RR tdataR tdtm((s*/opt/alt/python27/lib64/python2.7/sunau.pyt _write_u32s tAu_readcBsŞeZd„Zd„Zd„Zd„Zd„Zd„Zd„Zd„Z d„Z d „Z d „Z d „Z d „Zd „Zd„Zd„Zd„Zd„ZRS(cCsJt|ƒtdƒkr9ddl}|j|dƒ}n|j|ƒdS(NRi˙˙˙˙trb(ttypet __builtin__topentinitfp(tselftfR((s*/opt/alt/python27/lib64/python2.7/sunau.pyt__init__šs cCs|jr|jƒndS(N(t_filetclose(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt__del__ s cCs—||_d|_tt|ƒƒ}|tkr<td‚ntt|ƒƒ|_|jdkrltd‚n|jdkr‡td‚nt|ƒ|_|jtkrşt|jƒ|_ntt|ƒƒ|_ |j t krętd‚n|j t t fkrd|_ d |_n‘|j tkr6d |_|_ no|j tkrXd|_|_ nM|j tkrzd |_|_ n+|j tkrœd |_|_ n td ‚tt|ƒƒ|_tt|ƒƒ|_|j|j|_|jdkrT|j|jdƒ|_xPtt|jƒƒD]-}|j|d kr |j| |_Pq q Wn d|_y|jƒ|_Wn ttfk r’d|_nXdS(Nisbad magic numberisheader size too smallidsheader size ridiculously largesencoding not (yet) supportediiiisunknown encodingsR(Rt _soundposRR tAUDIO_FILE_MAGICRt _hdr_sizet _data_sizetAUDIO_UNKNOWN_SIZEt _encodingt_simple_encodingstAUDIO_FILE_ENCODING_MULAW_8tAUDIO_FILE_ENCODING_ALAW_8t _sampwidtht _framesizetAUDIO_FILE_ENCODING_LINEAR_8tAUDIO_FILE_ENCODING_LINEAR_16tAUDIO_FILE_ENCODING_LINEAR_24tAUDIO_FILE_ENCODING_LINEAR_32t _frameratet _nchannelsRt_infoRtlenttellt _data_postAttributeErrortIOErrortNone(RRtmagicR ((s*/opt/alt/python27/lib64/python2.7/sunau.pyR¤sV              cCs|jS(N(R(R((s*/opt/alt/python27/lib64/python2.7/sunau.pytgetfpÓscCs|jS(N(R2(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getnchannelsÖscCs|jS(N(R+(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getsampwidthŮscCs|jS(N(R1(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getframerateÜscCs4|jtkrtS|jtkr0|j|jSdS(Ni(R%R&R'R(R,(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getnframesßs cCs.|jtkrdS|jtkr&dSdSdS(NtULAWtALAWtNONE(R'R)R*(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getcomptypećs cCs.|jtkrdS|jtkr&dSdSdS(NsCCITT G.711 u-lawsCCITT G.711 A-lawsnot compressed(R'R)R*(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getcompnameîs cCs:|jƒ|jƒ|jƒ|jƒ|jƒ|jƒfS(N(R<R=R>R?RCRD(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getparamsöscCsdS(N(R9(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyt getmarkersűscCs td‚dS(Nsno marks(R(Rtid((s*/opt/alt/python27/lib64/python2.7/sunau.pytgetmarkţscCs|jtkr™|tkr-|jjƒ}n|jj||jƒ}|jt|ƒ|j7_|jtkr•ddl }|j ||j ƒ}n|SdS(Ni˙˙˙˙( R'R(R&RRR,R"R4R)taudiooptulaw2linR+R9(RtnframesRRI((s*/opt/alt/python27/lib64/python2.7/sunau.pyt readframess  cCs>|jdkrtdƒ‚n|jj|jƒd|_dS(Ns cannot seeki(R6R9R8RtseekR"(R((s*/opt/alt/python27/lib64/python2.7/sunau.pytrewindscCs|jS(N(R"(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR5scCss|dks||jƒkr*td‚n|jdkrHtdƒ‚n|jj|j||jƒ||_dS(Nisposition not in ranges cannot seek( R?RR6R9R8RRMR,R"(Rtpos((s*/opt/alt/python27/lib64/python2.7/sunau.pytsetposs  cCs d|_dS(N(R9R(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR s(RRRR!RR;R<R=R>R?RCRDRERFRHRLRNR5RPR (((s*/opt/alt/python27/lib64/python2.7/sunau.pyR˜s$   /             tAu_writecBs×eZd„Zd„Zd„Zd„Zd„Zd„Zd„Zd„Z d„Z d „Z d „Z d „Z d „Zd „Zd„Zd„Zd„Zd„Zd„Zd„Zd„Zd„Zd„ZRS(cCsJt|ƒtdƒkr9ddl}|j|dƒ}n|j|ƒdS(NRi˙˙˙˙twb(RRRR(RRR((s*/opt/alt/python27/lib64/python2.7/sunau.pyR$s cCs|jr|jƒndS(N(RR (R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR!*s cCsg||_d|_d|_d|_d|_t|_d|_d|_d|_ d|_ d|_ dS(NiRR@( RR1R2R+R,R&t_nframest_nframeswrittent _datawrittent _datalengthR3t _comptype(RR((s*/opt/alt/python27/lib64/python2.7/sunau.pyR.s          cCs:|jrtd‚n|dkr-td‚n||_dS(Ns0cannot change parameters after starting to writeiiis"only 1, 2, or 4 channels supported(iii(RTRR2(Rt nchannels((s*/opt/alt/python27/lib64/python2.7/sunau.pyt setnchannels;s     cCs|jstd‚n|jS(Nsnumber of channels not set(R2R(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR<Bs  cCs:|jrtd‚n|dkr-td‚n||_dS(Ns0cannot change parameters after starting to writeiiisbad sample width(iii(RTRR+(Rt sampwidth((s*/opt/alt/python27/lib64/python2.7/sunau.pyt setsampwidthGs     cCs|jstd‚n|jS(Nssample width not specified(R1RR+(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR=Ns  cCs"|jrtd‚n||_dS(Ns0cannot change parameters after starting to write(RTRR1(Rt framerate((s*/opt/alt/python27/lib64/python2.7/sunau.pyt setframerateSs  cCs|jstd‚n|jS(Nsframe rate not set(R1R(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR>Xs  cCs:|jrtd‚n|dkr-td‚n||_dS(Ns0cannot change parameters after starting to writeis# of frames cannot be negative(RTRRS(RRK((s*/opt/alt/python27/lib64/python2.7/sunau.pyt setnframes]s     cCs|jS(N(RT(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR?dscCs%|dkr||_n td‚dS(NRBR@sunknown compression type(RBR@(RWR(RRtname((s*/opt/alt/python27/lib64/python2.7/sunau.pyt setcomptypegs  cCs|jS(N(RW(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyRCmscCs.|jdkrdS|jdkr&dSdSdS(NR@sCCITT G.711 u-lawRAsCCITT G.711 A-lawsnot compressed(RW(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyRDps cCs`|\}}}}}}|j|ƒ|j|ƒ|j|ƒ|j|ƒ|j||ƒdS(N(RYR[R]R^R`(RtparamsRXRZR\RKtcomptypetcompname((s*/opt/alt/python27/lib64/python2.7/sunau.pyt setparamsxs     cCs:|jƒ|jƒ|jƒ|jƒ|jƒ|jƒfS(N(R<R=R>R?RCRD(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyRE€scCs|jS(N(RT(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR5…scCsŠ|jƒ|jdkr=ddl}|j||jƒ}nt|ƒ|j}|jj|ƒ|j ||_ |j t|ƒ|_ dS(NR@i˙˙˙˙( t_ensure_header_writtenRWRItlin2ulawR+R4R,RRRTRU(RRRIRK((s*/opt/alt/python27/lib64/python2.7/sunau.pytwriteframesrawˆs  cCsB|j|ƒ|j|jks1|j|jkr>|jƒndS(N(RgRTRSRVRUt _patchheader(RR((s*/opt/alt/python27/lib64/python2.7/sunau.pyt writeframes’s cCsi|jrezL|jƒ|j|jks:|j|jkrG|jƒn|jjƒWdd|_XndS(N( RReRTRSRVRURhtflushR9(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyR ˜s   cCsY|jsU|jstd‚n|js3td‚n|jsHtd‚n|jƒndS(Ns# of channels not specifiedssample width not specifiedsframe rate not specified(RTR2RR+R1t _write_header(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyRe§s       cCsč|jdkr~|jdkr0t}d|_q¨|jdkrQt}d|_q¨|jdkrrt}d|_q¨td‚n*|jdkrŸt}d|_n td‚|j|j|_t |j t ƒdt |j ƒ}|dd @}t |j |ƒ|jtkrt}n|j|j}y|j jƒ|_Wn ttfk r\d|_nXt |j |ƒ||_t |j |ƒt |j |jƒt |j |jƒ|j j|j ƒ|j jd |t |j ƒd ƒdS( NRBiiisinternal errorR@iisiiř˙˙˙(RWR+R-R,R.R0RR)R2RRR#R4R3RSR&R5t_form_length_posR7R8R9RVR1R(Rtencodingt header_sizetlength((s*/opt/alt/python27/lib64/python2.7/sunau.pyRkąsD         cCsg|jdkrtdƒ‚n|jj|jƒt|j|jƒ|j|_|jjddƒdS(Ns cannot seekii(RlR9R8RRMRRURV(R((s*/opt/alt/python27/lib64/python2.7/sunau.pyRhŘs  (RRRR!RRYR<R[R=R]R>R^R?R`RCRDRdRER5RgRiR ReRkRh(((s*/opt/alt/python27/lib64/python2.7/sunau.pyRQ"s.                   'cCsi|dkr0t|dƒr'|j}q0d}n|dkrFt|ƒS|dkr\t|ƒStd‚dS( NtmodeRtrtwRRs$mode must be 'r', 'rb', 'w', or 'wb'(RqR(RrRR(R9thasattrRpRRQR(RRp((s*/opt/alt/python27/lib64/python2.7/sunau.pyRŕs       N(((t__doc__R#R)R-R.R/R0tAUDIO_FILE_ENCODING_FLOATtAUDIO_FILE_ENCODING_DOUBLEtAUDIO_FILE_ENCODING_ADPCM_G721tAUDIO_FILE_ENCODING_ADPCM_G722t AUDIO_FILE_ENCODING_ADPCM_G723_3t AUDIO_FILE_ENCODING_ADPCM_G723_5R*R&R(t ExceptionRR RRRQR9Rtopenfp(((s*/opt/alt/python27/lib64/python2.7/sunau.pyths6  Šž