mò %U²Ic@s»dZdkZdddgZdefd„ƒYZdZdZdkZei ddƒd jo dZ nd Z d k l Z d fd„ƒYZ dfd„ƒYZdd„ZeZdS(s Stuff to parse WAVE files. Usage. Reading WAVE files: f = wave.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' for linear samples) getcompname() -- returns human-readable version of compression type ('not compressed' linear samples) 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 WAVE files: f = wave.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. NtopentopenfptErrorcBstZRS(N(t__name__t __module__(((t!/data/zmath/lib/python2.4/wave.pyRNsitbthtlti(sChunkt Wave_readcBs¹tZdZd„Zd„Zd„Zd„Zd„Zd„Zd„Z d„Z d „Z d „Z d „Z d „Zd „Zd„Zd„Zd„Zd„Zd„Zd„ZRS(sPVariables used in this class: These variables are available to the user though appropriate methods of this class: _file -- the open file with methods read(), close(), and seek() set through the __init__() method _nchannels -- the number of audio channels available through the getnchannels() method _nframes -- the number of audio frames available through the getnframes() method _sampwidth -- the number of bytes per audio sample available through the getsampwidth() method _framerate -- the sampling frequency available through the getframerate() method _comptype -- the AIFF-C compression type ('NONE' if AIFF) available through the getcomptype() method _compname -- the human-readable AIFF-C compression type available through the getcomptype() method _soundpos -- the position in the audio stream available through the tell() method, set through the setpos() method These variables are used internally only: _fmt_chunk_read -- 1 iff the FMT chunk has been read _data_seek_needed -- 1 iff positioned correctly in audio file for readframes() _data_chunk -- instantiation of a chunk class for the DATA chunk _framesize -- size of one frame in the file cCsud|_d|_t|ddƒ|_|iiƒdjo td‚n|ii dƒdjo td‚nd|_ d|_ xÉd|_ yt|iddƒ}Wntj oPnX|iƒ}|d jo|i|ƒd|_ nO|d joA|i p td ‚n||_ |i|i|_d|_ Pn|iƒq…W|i p |i o td ‚ndS( Nit bigendiantRIFFs file does not start with RIFF iditWAVEsnot a WAVE fileisfmt tdatasdata chunk before fmt chunks#fmt chunk and/or data chunk missing(tNonetselft_convertt _soundpostChunktfilet_filetgetnameRtreadt_fmt_chunk_readt _data_chunkt_data_seek_neededtchunktEOFErrort chunknamet_read_fmt_chunkt chunksizet _framesizet_nframestskip(RRRR((Rtinitfp}s<                cCsId|_t|tƒoti|dƒ}||_n|i|ƒdS(Ntrb( RRt_i_opened_the_filet isinstancetft basestringt __builtin__RR#(RR'((Rt__init__œs   cCs|iƒdS(N(Rtclose(R((Rt__del__¤scCs|iS(N(RR(R((Rtgetfp©scCsd|_d|_dS(Nii(RRR(R((Rtrewind¬s cCs1|io|iiƒd|_nd|_dS(N(RR%R+RR(R((RR+°s   cCs|iS(N(RR(R((Rttell¶scCs|iS(N(Rt _nchannels(R((Rt getnchannels¹scCs|iS(N(RR!(R((Rt getnframes¼scCs|iS(N(Rt _sampwidth(R((Rt getsampwidth¿scCs|iS(N(Rt _framerate(R((Rt getframerateÂscCs|iS(N(Rt _comptype(R((Rt getcomptypeÅscCs|iS(N(Rt _compname(R((Rt getcompnameÈscCs:|iƒ|iƒ|iƒ|iƒ|iƒ|iƒfS(N(RR1R4R6R2R8R:(R((Rt getparamsËscCsdS(N(R(R((Rt getmarkersÐscCs td‚dS(Nsno marks(R(Rtid((RtgetmarkÓscCs@|djp||ijo td‚n||_d|_dS(Nisposition not in rangei(tposRR!RRR(RR?((RtsetposÖs  cCs¾|ioN|iiddƒ|i|i}|o|ii|dƒnd|_n|djodSn|idjoÜt oÕdk }|i}|i t |iƒ}||i}||i|i|ijo|i|i|i}n|i|ii|ƒ|i||i|_|i}|i||i|_|iƒ|iƒ}n|ii||iƒ}|io|o|i|ƒ}n|it|ƒ|i|i|_|S(Niti(RRRtseekRR R?tnframesR3t big_endiantarrayRt _array_fmtsRR0tnitemsRt size_readtfromfileRtbyteswapttostringRRtlen(RRCRGRR?RRE((Rt readframesÜs4        $cCsªtid|idƒƒ\}|_|_}}|t jo4tid|idƒƒd}|dd|_ nt d|f‚|i|i |_d |_d |_dS( NsR@RMR(((RR ^s(                   &t Wave_writecBsøtZdZd„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„Zd„Zd„Zd„Zd„ZRS(s¿Variables used in this class: These variables are user settable through appropriate methods of this class: _file -- the open file with methods write(), close(), tell(), seek() set through the __init__() method _comptype -- the AIFF-C compression type ('NONE' in AIFF) set through the setcomptype() or setparams() method _compname -- the human-readable AIFF-C compression type set through the setcomptype() or setparams() method _nchannels -- the number of audio channels set through the setnchannels() or setparams() method _sampwidth -- the number of bytes per audio sample set through the setsampwidth() or setparams() method _framerate -- the sampling frequency set through the setframerate() or setparams() method _nframes -- the number of audio frames written to the header set through the setnframes() or setparams() method These variables are used internally only: _datalength -- the size of the audio samples written to the header _nframeswritten -- the number of frames actually written _datawritten -- the size of the audio samples actually written cCsId|_t|tƒoti|dƒ}||_n|i|ƒdS(Ntwb( RRR%R&R'R(R)RR#(RR'((RR*'s   cCsU||_d|_d|_d|_d|_d|_d|_ d|_ d|_ dS(Ni( RRRRRR0R3R5R!t_nframeswrittent _datawrittent _datalength(RR((RR#.s        cCs|iƒdS(N(RR+(R((RR,9scCs>|io td‚n|djo td‚n||_dS(Ns0cannot change parameters after starting to writeisbad # of channels(RRZRt nchannelsR0(RR\((Rt setnchannels?s     cCs|ip td‚n|iS(Nsnumber of channels not set(RR0R(R((RR1Fs  cCsK|io td‚n|djp |djo td‚n||_dS(Ns0cannot change parameters after starting to writeiisbad sample width(RRZRRUR3(RRU((Rt setsampwidthKs    cCs|ip td‚n|iS(Nssample width not set(RR3R(R((RR4Rs  cCs>|io td‚n|djo td‚n||_dS(Ns0cannot change parameters after starting to writeisbad frame rate(RRZRt framerateR5(RR_((Rt setframerateWs     cCs|ip td‚n|iS(Nsframe rate not set(RR5R(R((RR6^s  cCs$|io td‚n||_dS(Ns0cannot change parameters after starting to write(RRZRRCR!(RRC((Rt setnframescs  cCs|iS(N(RRY(R((RR2hscCsG|io td‚n|djo td‚n||_||_dS(Ns0cannot change parameters after starting to writeRNsunsupported compression type(sNONE(RRZRtcomptypeR7tcompnameR9(RRbRc((Rt setcomptypeks      cCs|iS(N(RR7(R((RR8sscCs|iS(N(RR9(R((RR:vscCsw|\}}}}}}|io td‚n|i |ƒ|i |ƒ|i |ƒ|i |ƒ|i ||ƒdS(Ns0cannot change parameters after starting to write(R\RUR_RCRbRcRRZRR]R^R`RaRd(Rt.2R\RUR_RCRbRc((Rt setparamsys      cCsV|i p|i p |i o td‚n|i|i|i|i|i|ifS(Nsnot all parameters set(RR0R3R5RR!R7R9(R((RR;‚s! cCs td‚dS(Nssetmark() not supported(R(RR=R?tname((RtsetmarkˆscCs td‚dS(Nsno marks(R(RR=((RR>‹scCsdS(N(R(R((RR<ŽscCs|iS(N(RRY(R((RR/‘scCsø|it|ƒƒt|ƒ|i|i}|io|i|ƒ}n|idjodto]dk }|i t |i|ƒ}|i ƒ|i |i ƒ|it|ƒ|i|_n'|i i|ƒ|it|ƒ|_|i||_dS(Ni(Rt_ensure_header_writtenRLRR3R0RCRRDRERFRJttofileRRZtwriteRY(RRRCRE((Rtwriteframesraw”s   !cCs2|i|ƒ|i|ijo|iƒndS(N(RRlRR[RZt _patchheader(RR((Rt writeframes¤s cCsz|ioH|idƒ|i|ijo|iƒn|iiƒd|_n|io|ii ƒd|_ndS(Ni( RRRiR[RZRmtflushRR%R+(R((RR+©s      cCsd|ipV|ip td‚n|ip td‚n|ip td‚n|i|ƒndS(Ns# channels not specifiedssample width not specifiedssampling rate not specified(RRZR0RR3R5t _write_headertdatasize(RRq((RRi¸s       cCsÿ|iidƒ|ip||i|i|_n|i|i|i|_|iiƒ|_ |iit i dd|idddt |i|i |i|i |i|i|i|iddƒ ƒ|iiƒ|_|iit i d |iƒƒdS( NR sR<R/RlRnR+RiRpRm(((RRW s6                       cCsw|djo't|dƒo |i}q4d}n|djot|ƒSn%|djot|ƒSn td‚dS( NtmodeR$trtwRXs$mode must be 'r', 'rb', 'w', or 'wb'(Rxsrb(Ryswb(RwRthasattrR'R RWR(R'Rw((RRÜs     (NRRNR(RVR)t__all__t ExceptionRRTRRFRORtRDRRR RWRR( ROR{RRRTR)R RWRRDRRF((Rt?Hs    ¯Ï