C # recording and pitch modulation

Always wanted to study the recording. There's a project that has a chance to use the powerful Naudio (Https://github.com/naudio/NAudio) Library

Recording

Naudio Recording Class Library

public class Naudiorecorder {public WaveIn wavesource = null;        Public Wavefilewriter wavefile = null; private string fileName = String.        Empty; <summary>///Start recording///</summary> public void Startrec () {Wavesour            CE = new WaveIn (); Wavesource.waveformat = new Waveformat (16000, 16, 1); 16bit,16khz,mono's recording format wavesource.dataavailable + = new Eventhandler<waveineventargs> (WaveSource_DataAva            ilable);            wavesource.recordingstopped + = new eventhandler<stoppedeventargs> (wavesource_recordingstopped); writer = new Wavefilewriter (Outputfilepath, capture.            Waveformat);            var capture = new Wasapiloopbackcapture ();            Directory.CreateDirectory (FileName);            var Outputfilepath = Path.Combine (FileName, "recorded.wav");            Wavefile = new Wavefilewriter (Outputfilepath, Wavesource.waveformat);     Wavesource.startrecording ();   }///<summary>///Stop recording///</summary> public void Stoprec () {            Wavesource.stoprecording ();                if (Wavesource! = null) {wavesource.dispose ();            Wavesource = null;                } if (wavefile! = null) {wavefile.dispose ();            Wavefile = null; }}///<summary>///The file path saved after recording ends///</summary>//<param name= "Filen Ame "> Save path name for WAV file </param> public void Setfilename (string fileName) {this.filename = File        Name; }///<summary>//Start recording callback function///</summary>//<param name= "Sender" ></pa ram>//<param name= "E" ></param> private void Wavesource_dataavailable (object sender, WaveIn EventArgs e) {if (wavefile! = null) {WavefilE.write (e.buffer, 0, e.bytesrecorded);            Wavefile.flush (); }}///<summary>///audio End callback function///</summary>//<param name= "Sender" &G t;</param>//<param name= "E" ></param> private void wavesource_recordingstopped (object se                NDEr, Stoppedeventargs e) {if (Wavesource! = null) {wavesource.dispose ();            Wavesource = null;                } if (wavefile! = null) {wavefile.dispose ();            Wavefile = null; }        }    }

Voice Changer

The voice changer used to be SoundTouch.dll.

SoundTouch Wrapper

public class SoundTouch {private INTPTR handle;        Public SoundTouch () {handle = Soundtouch_createinstance ();        } ~soundtouch () {soundtouch_destroyinstance (handle); }//<summary>//Get SoundTouch Version string///</summary> public static STR ing getversionstring () {//convert "char *" Data to C # string return Marshal.ptrtostringansi        (Soundtouch_getversionstring ()); }//<summary>//Returns number of processed samples currently available in SoundTouch for Immediat        E output.        </summary> public UINT NumSamples () {return soundtouch_numsamples (handle); }///<summary>//Adds ' NumSamples ' pcs of samples from the ' samples ' memory position into/ /The input of the object. Notice that the sample rate _has_to_ is set before//calling this FuNction, otherwise throws a Runtime_error exception. </summary>//<param name= "samples" >sample buffer to input</param>//<param name = "NumSamples" >number of sample frames in buffer. Notice//, multi-channel sound a single sample frame contains//data for all channels< /param> public void Putsamples (float[] samples, uint numsamples) {soundtouch_putsamples (Handl        E, samples, numsamples); }//<summary>//sets the number of channels//</summary>//<param name=        "Numchannels" >1 = Mono, 2 = stereo, n = multichannel</param> public void setchannels (UINT numchannels)        {soundtouch_setchannels (handle, numchannels);        }///<summary>//sets sample rate. </summary>//<param name= "srate" >samplerate, e.g. 44100</param> public void Setsamplerate (UINT srate) {soundtouch_setsamplerate (handle, srate);        }//<summary>//Receive processed samples from the processor.  </summary>//<param name= "Outbuffer" >buffer where to copy output samples</param>// <param name= "Maxsamples" >max number of sample frames to receive</param>//<returns></return s> public UINT Receivesamples (float[] outbuffer, uint maxsamples) {return soundtouch_receives        Amples (handle, Outbuffer, maxsamples);        }///<summary>//Flushes the last samples from the processing pipeline to the output.        Clears also the internal processing buffers. Note:this function is meant for extracting, the last samples of a sound//stream. This function could introduce additional blank samples in the end///of the sound stream, and thus it's not recommen DEd to call this function///In the middle of a sound stream.        </summary> public void Flush () {Soundtouch_flush (handle); }//<summary>//Clears all the samples in the object ' s output and internal processing//b        Uffers.        </summary> public void Clear () {soundtouch_clear (handle);         }//<summary>//sets new tempo control value. </summary>//<param name= "Newtempo" >tempo setting. Normal Tempo = 1.0, smaller values//represent slower tempo, larger faster tempo.</param> public voi        D settempo (float newtempo) {soundtouch_settempo (handle, Newtempo); }///<summary>//sets new tempo control value as a difference in percents compared//to TH        E Original tempo (-50.. +100); </summary>//<param name= "NewteMPO ">tempo setting in%</param> public void Settempochange (float newtempo) {Soundtouch_        Settempochange (handle, Newtempo);         }//<summary>//sets new rate control value. </summary>//<param name= "newrate" >rate setting. Normal Rate = 1.0, smaller values//represent slower rate, larger faster rate.</param> public void S        Etrate (float newrate) {soundtouch_settempo (handle, newrate);  }//<summary>//sets new rate control value as a difference in percents compared//to the        Original Rate (-50: +100); </summary>//<param name= "newrate" >rate setting in%</param> public void Setratechan        GE (float newrate) {soundtouch_setratechange (handle, newrate);         }//<summary>//sets new pitch control value.        </summary><param name= "Newpitch" >pitch setting.        Original pitch = 1.0, smaller values//represent lower pitches, larger values higher pitch.</param>        public void SetPitch (float newpitch) {soundtouch_setpitch (handle, Newpitch);  }///<summary>//sets pitch change in octaves compared to the original pitch//(-1.00).        +1.00 for +-one octave); </summary>//<param name= "Newpitch" >pitch setting in octaves</param> public void Set        Pitchoctaves (float newpitch) {soundtouch_setpitchoctaves (handle, Newpitch);  }///<summary>//sets pitch change in semi-tones compared to the original pitch//(-12).        +12 for +-one octave); </summary>//<param name= "Newpitch" >pitch setting in semitones</param> public void S Etpitchsemitones (float newpitch) {Soundtouch_setpitchSemitones (handle, Newpitch);        }//<summary>//Int16 version of Soundtouch_putsamples (): This accept int16 (short) sample data And internally converts it to float format before processing//</summary>//<param Nam E= "Samples" >sample input buffer.</param>//<param name= "NumSamples" >number of Sample frames in BUF Fer. Notice//, multi-channel sound a single///sample frame contains data for all CHANNELS.&LT ;/param> public void putsamples_i16 (short[] samples, uint numsamples) {Soundtouch_putsamples_        I16 (handle, samples, numsamples); }//<summary>//changes a setting controlling the processing system behaviour.        See the///' Setting_ ' defines for available SETTING ID ' s. </summary>//<param name= "Settingid" >setting ID number. See Setting_ ... defines.</param>///<param name= "value" New setting value></param>//<returns>nonzero If successful, otherwise zer o</returns> public int setsetting (int settingid, int value) {return soundtouch_setsetting (        Handle, Settingid, value); }//<summary>//Reads A setting controlling the processing system behaviour.        See the///' Setting_ ' defines for available SETTING ID ' s. </summary>//<param name= "Settingid" >setting ID number</param>//<returns>th e setting value</returns> public int soundtouch_getsetting (int settingid) {return Soundtou        Ch_getsetting (handle, Settingid);        }//<summary>//Returns number of samples currently unprocessed in SoundTouch internal buffer </summary>//<returns>number of Sample frames</returns> public uint Numunprocesse      Dsamples ()  {return soundtouch_numunprocessedsamples (handle);         }///<summary>//Int16 version of Soundtouch_receivesamples (): This converts internal float samples Into Int16 (short) return data type///</summary>//<param name= "Outbuffer" >buffe R where to copy output samples.</param>//<param name= "Maxsamples" >how many samples to receive at max .</param>//<returns>number of received sample frames</returns> public uint Soundtouch_r ECEIVESAMPLES_I16 (short[] outbuffer, uint maxsamples) {return soundtouch_receivesamples_i16 (handle, out        Buffer, Maxsamples);        }//<summary>//Check If there aren ' t any samples available for outputting. </summary>//<returns>nonzero If there aren ' t any samples available for Outputting</returns&gt        ; public int IsEmpty () {return soundTouch_isempty (handle); } [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl, EntryPoint = "Soundtouch_getversionid")  ]///<summary>//Get SoundTouch Library version Id///</summary> public static        extern int Getversionid (); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern IntPtr Soundtouch_        CreateInstance (); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_de        Stroyinstance (IntPtr h); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern IntPtr Soundtouch_        GetVersionString (); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Trate (IntPtr H, float newrate);      [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)]  private static extern void Soundtouch_settempo (IntPtr h, float newtempo); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Tratechange (IntPtr H, float newrate); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Ttempochange (IntPtr H, float newtempo); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Tpitch (IntPtr H, float newpitch); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Tpitchoctaves (IntPtr H, float newpitch); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Tpitchsemitones (IntPtr H, float newpitch);  [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)]      private static extern void Soundtouch_setchannels (IntPtr h, uint numchannels); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_se        Tsamplerate (IntPtr H, uint srate); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_fl        Ush (IntPtr h); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_pu        Tsamples (IntPtr H, float[] samples, uint numsamples); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_pu        TSAMPLES_I16 (IntPtr H, short[] samples, uint numsamples); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern void Soundtouch_cl        Ear (IntPtr h); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] Private static extern int soundtouch_setsetting (IntPtr h, int settingid, int value); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern int Soundtouch_get        Setting (IntPtr h, int settingid); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern uint Soundtouch_nu        Munprocessedsamples (IntPtr h); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern uint Soundtouch_re        Ceivesamples (IntPtr H, float[] outbuffer, uint maxsamples); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern uint Soundtouch_re        CEIVESAMPLES_I16 (IntPtr H, short[] outbuffer, uint maxsamples); [DllImport ("SoundTouch.dll", CallingConvention = callingconvention.cdecl)] private static extern uint Soundtouch_nu        MSamples (IntPtr h); [DllImport ("SoundTouch.dll", CallingConvention = CallingcoNvention.    CDECL)] private static extern int soundtouch_isempty (IntPtr h); }

SOURCE Download (Https://files.cnblogs.com/files/leoxjy/demo.zip)

C # recording and pitch modulation