C# 录音和变调

一直想研究下录音 正好有个项目有机会使用一下强大的 NAudio (https://github.com/naudio/NAudio)库

 

 录音

NAudio 录音类库

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public class NAudioRecorder     {         public WaveIn waveSource = null;         public WaveFileWriter waveFile = null;         private string fileName = string.Empty;           /// <summary>         /// 开始录音         /// </summary>         public void StartRec()         {             waveSource = new WaveIn();             waveSource.WaveFormat = new WaveFormat(16000, 16, 1); // 16bit,16KHz,Mono的录音格式               waveSource.DataAvailable += new EventHandler<WaveInEventArgs>(waveSource_DataAvailable);             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>         /// 停止录音         /// </summary>         public void StopRec()         {             waveSource.StopRecording();               if (waveSource != null)             {                 waveSource.Dispose();                 waveSource = null;             }               if (waveFile != null)             {                 waveFile.Dispose();                 waveFile = null;             }         }           /// <summary>         /// 录音结束后保存的文件路径         /// </summary>         /// <param name="fileName">保存wav文件的路径名</param>         public void SetFileName(string fileName)         {             this.fileName = fileName;         }           /// <summary>         /// 开始录音回调函数         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void waveSource_DataAvailable(object sender, WaveInEventArgs e)         {             if (waveFile != null)             {                 waveFile.Write(e.Buffer, 0, e.BytesRecorded);                 waveFile.Flush();             }         }           /// <summary>         /// 录音结束回调函数         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void waveSource_RecordingStopped(object sender, StoppedEventArgs e)         {             if (waveSource != null)             {                 waveSource.Dispose();                 waveSource = null;             }               if (waveFile != null)             {                 waveFile.Dispose();                 waveFile = null;             }         }     }

变声

变声用到的是SoundTouch.dll 

SoundTouch wrapper 

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public class SoundTouch     {         private IntPtr handle;           public SoundTouch()         {             handle = soundtouch_createInstance();         }             ~SoundTouch()         {             soundtouch_destroyInstance(handle);         }           /// <summary>         /// Get SoundTouch version string         /// </summary>         public static String GetVersionString()         {             // convert "char *" data to c# string             return Marshal.PtrToStringAnsi(soundtouch_getVersionString());         }             /// <summary>         /// Returns number of processed samples currently available in SoundTouch for immediate 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 sample rate _has_to_ be 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         /// that in case of multi-channel sound a single sample frame contains         /// data for all channels</param>         public void PutSamples(float[] samples, uint numSamples)         {             soundtouch_putSamples(handle, 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></returns>         public uint ReceiveSamples(float[] outBuffer, uint maxSamples)         {             return soundtouch_receiveSamples(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 may introduce additional blank samples in the end         /// of the sound stream, and thus it's not recommended 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         /// buffers.         /// </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 void SetTempo(float newTempo)         {             soundtouch_setTempo(handle, newTempo);         }           /// <summary>         /// Sets new tempo control value as a difference in percents compared         /// to the 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 SetRate(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 SetRateChange(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 SetPitchOctaves(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 SetPitchSemiTones(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 name="samples">Sample input buffer.</param>         /// <param name="numSamples">Number of sample frames in buffer. Notice         /// that in case of multi-channel sound a single         /// sample frame contains data for all channels.</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 zero</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>The setting value</returns>         public int soundtouch_getSetting(int settingId)         {             return soundtouch_getSetting(handle, settingId);         }           /// <summary>         /// Returns number of samples currently unprocessed in SoundTouch internal buffer         /// </summary>         /// <returns>Number of sample frames</returns>         public uint NumUnprocessedSamples()         {             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">Buffer 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_receiveSamples_i16(short[] outBuffer, uint maxSamples)         {             return soundtouch_receiveSamples_i16(handle, outBuffer, 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>         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_destroyInstance(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_setRate(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_setRateChange(IntPtr h, float newRate);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_setTempoChange(IntPtr h, float newTempo);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_setPitch(IntPtr h, float newPitch);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_setPitchOctaves(IntPtr h, float newPitch);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_setPitchSemiTones(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_setSampleRate(IntPtr h, uint srate);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_flush(IntPtr h);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_putSamples(IntPtr h, float[] samples, uint numSamples);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_putSamples_i16(IntPtr h, short[] samples, uint numSamples);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern void soundtouch_clear(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_getSetting(IntPtr h, int settingId);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern uint soundtouch_numUnprocessedSamples(IntPtr h);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern uint soundtouch_receiveSamples(IntPtr h, float[] outBuffer, uint maxSamples);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern uint soundtouch_receiveSamples_i16(IntPtr h, short[] outBuffer, uint maxSamples);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern uint soundtouch_numSamples(IntPtr h);           [DllImport("SoundTouch.dll", CallingConvention = CallingConvention.Cdecl)]         private static extern int soundtouch_isEmpty(IntPtr h);     }

　　源码下载(https://files.cnblogs.com/files/leoxjy/demo.zip)