nAudio WAV to MP3 muLaw error -

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i grabbing wav file (successfully) via web service , able play on windows 7 machine. need grab same wav file , convert mp3 file. failing. have tried retrieving file wav (above) using --

wavestream pcmstream = waveformatconversionstream.createpcmstream(reader);

to convert mulaw pcm.

this failing attached error. have tried converting directly using lamemp3filewriter fails telling me "mulaw format cannot converted mp3.

what missing? coder snippet private void writemp3(string inum, string callid) { //construct replay url using inum string url = "http://" + _verintserver + "/searchapi?command=replay&id=" + inum;

        // name new mp3 file         string mp3file =_basepath + "mp3\\" + callid + ".mp3";         string tempwav = _basepath + "mp3\\" + callid + ".wav";         string temppcm = _basepath + "mp3\\" + callid + "_pcm.wav";          //issue web service request         httpwebrequest request = (httpwebrequest)system.net.webrequest.create(url);          //retrieve content type raw pcm (.wav)         request.contenttype = "audio/wav";          //encode , include basic authentication credentials         string encoded = system.convert.tobase64string(system.text.encoding.getencoding("iso-8859-1").getbytes(_username + ":" + _password));         request.headers.add("authorization", "basic " + encoded);          //retrieve response         httpwebresponse response = (system.net.httpwebresponse)request.getresponse();          //copy stream of bytes local directory using callid file name         if (request.haveresponse)         {             //create temporary wav file              using (var receivestream = response.getresponsestream())             {                 using (var pstream = new filestream(tempwav, filemode.create,fileaccess.write))                 {                     receivestream.copyto(pstream);                 }             }              wavetopcm(tempwav, temppcm);             wavetomp3(temppcm, mp3file, 128);         }         return;     }      //convert mulaw wav pcm     private void wavetopcm(string wavefilename, string pcmfilename)     {         using (var reader = new cuewavefilereader(wavefilename))         {             wavestream pcmstream = waveformatconversionstream.createpcmstream(reader);             using (var pstream = new filestream(pcmfilename, filemode.create, fileaccess.write))             {                pcmstream.copyto(pstream);             }                     }                    return;     }      // convert wav mp3 using libmp3lame library     public void wavetomp3(string wavefilename, string mp3filename, int bitrate = 128)     {         using (var reader = new wavefilereader(wavefilename))         using (var writer = new lamemp3filewriter(mp3filename, reader.waveformat, bitrate))             reader.copyto(writer);     }

stack trace: {"$id":"1","message":"an error has occurred.","exceptionmessage":"not wave file - no riff header","exceptiontype":"system.formatexception","stacktrace":" @ naudio.fileformats.wav.wavefilechunkreader.readriffheader(binaryreader br)\r\n @ naudio.fileformats.wav.wavefilechunkreader.readwaveheader(stream stream)\r\n @ naudio.wave.wavefilereader..ctor(stream inputstream)\r\n @ naudio.wave.wavefilereader..ctor(string wavefile)\r\n @ dataservices.controllers.recordingscontroller.wavetomp3(string wavefilename, string mp3filename, int32 bitrate) in c:\codebank\dataaccess\dataservices\controllers\recordingscontroller.cs:line 179\r\n @ dataservices.controllers.recordingscontroller.writemp3(string inum,

in wavetopcm function writing raw samples file. need use wavefilewriter.createwavefile passing in pcmstream make 16 bit pcm wav file can pass lame mp3 writer


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