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[C#/COMMON/NAUDIO/.NET8] FSK (Frequency Shift Keying) 변조 사용하기

■ FSK (Frequency Shift Keying) 변조를 사용하는 방법을 보여준다. [Encoder 프로젝트] ▶ Program.cs


using System;
using System.IO;
using System.Linq;
using System.Numerics;
using System.Text;

using NAudio.Wave;

namespace DECODER;

/// <summary>
/// 디코더
/// </summary>
class Decoder
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Static
    //////////////////////////////////////////////////////////////////////////////// Private

    #region 다음 2의 거듭 제곱 구하기 - NextPowerOfTwo(value)

    /// <summary>
    /// 다음 2의 거듭 제곱 구하기
    /// </summary>
    /// <param name="value">값</param>
    /// <returns></returns>
    /// <remarks>입력값보다 큰 가장 작은 2의 거듭 제곱을 계산한다.</remarks>
    private static int NextPowerOfTwo(int value)
    {
        int power = 1;

        while(power < value)
        {
            power <<= 1;
        }

        return power;
    }

    #endregion
    #region 비트 반전하기 - BitReverse(bitValue, bitCount)

    /// <summary>
    /// 비트 반전하기
    /// </summary>
    /// <param name="bitValue">비트 값</param>
    /// <param name="bitCount">비트 수</param>
    /// <returns>반전 비트 값</returns>
    private static int BitReverse(int bitValue, int bitCount)
    {
        int reversed = 0;

        for(int i = 0; i < bitCount; i++)
        {
            int nextBit = (bitValue >> i) & 1;

            reversed |= (nextBit << (bitCount - i - 1));
        }

        return reversed;
    }

    #endregion
    #region FFT 처리하기 - FFT(complexArray)

    /// <summary>
    /// FFT 처리하기
    /// </summary>
    /// <param name="complexArray">복소수 배열</param>
    private static void FFT(Complex[] complexArray)
    {
        int complexArrayLength = complexArray.Length;

        if(complexArrayLength <= 1)
        {
            return;
        }

        // Bit reversal permutation
        int m1 = (int)Math.Log(complexArrayLength, 2);

        for(int i = 0; i < complexArrayLength; i++)
        {
            int j = BitReverse(i, m1);

            if(j > i)
            {
                Complex t = complexArray[i];

                complexArray[i] = complexArray[j];
                complexArray[j] = t;
            }
        }

        // Cooley-Tukey FFT
        for(int s = 1; s <= m1; s++)
        {
            int m2 = 1 << s;

            Complex wm = Complex.Exp(-2.0 * Math.PI * Complex.ImaginaryOne / m2);

            for(int k = 0; k < complexArrayLength; k += m2)
            {
                Complex w = 1;

                for(int j = 0; j < m2 / 2; j++)
                {
                    int index1 = k + j;
                    int index2 = k + j + m2 / 2;

                    Complex t = w * complexArray[index2];
                    Complex u = complexArray[index1];

                    complexArray[index1] = u + t;
                    complexArray[index2] = u - t;

                    w *= wm;
                }
            }
        }
    }

    #endregion
    #region 프로그램 시작하기 - Main(argumentArray)

    /// <summary>
    /// 프로그램 시작하기
    /// </summary>
    /// <param name="argumentArray">인자 배열</param>
    private static void Main(string[] argumentArray)
    {
        if(argumentArray.Length != 2)
        {
            Console.WriteLine("사용법 : decoder.exe source.wav target.zip");

            return;
        }

        string sourceFilePath = argumentArray[0];
        string targetFilePath = argumentArray[1];

        int    samplingFrequency = 44100; // 샘플링 주파수
        double durationPerBit    = 0.01;  // 각 비트의 지속 시간 (초)
        int    sampleCountPerBit = (int)(samplingFrequency * durationPerBit);

        int frequency0 = 1000; // '0'에 대한 주파수
        int frequency1 = 2000; // '1'에 대한 주파수

        // 시작 및 종료 마커를 설정한다.
        string startMarkerBitString = "1111000011110000";
        string endMarkerBitString   = "0000111100001111";

        // WAV 파일을 읽는다.
        float[] signalArray;

        using(AudioFileReader audioFileReader = new(sourceFilePath))
        {
            int totalSampleCount = (int)audioFileReader.Length / (audioFileReader.WaveFormat.BitsPerSample / 8);

            signalArray = new float[totalSampleCount];

            int readSampleCount = audioFileReader.Read(signalArray, 0, totalSampleCount);
        }

        int bitCount = signalArray.Length / sampleCountPerBit;

        StringBuilder bitStringBuilder = new StringBuilder();

        for(int i = 0; i < bitCount; i++)
        {
            int start = i * sampleCountPerBit;
            int end   = start + sampleCountPerBit;

            if(end > signalArray.Length)
            {
                break;
            }

            float[] segmentArray = new float[sampleCountPerBit];

            Array.Copy(signalArray, start, segmentArray, 0, sampleCountPerBit);

            // 입력 배열 길이를 가장 가까운 2의 거듭제곱으로 패딩한다.
            int paddedLength = NextPowerOfTwo(segmentArray.Length);

            Complex[] fftComplexArray = new Complex[paddedLength];

            for(int j = 0; j < segmentArray.Length; j++)
            {
                fftComplexArray[j] = new Complex(segmentArray[j], 0);
            }

            for(int j = segmentArray.Length; j < paddedLength; j++)
            {
                fftComplexArray[j] = Complex.Zero;
            }

            // 주파수 분석을 위한 FFT를 수행한다.
            FFT(fftComplexArray);

            double[] magnitudeArray = fftComplexArray.Take(paddedLength / 2).Select(c => c.Magnitude).ToArray();

            int peakIndex = Array.IndexOf(magnitudeArray, magnitudeArray.Max());

            double peakFrequency = (double)peakIndex * samplingFrequency / paddedLength;

            // 주파수에 따라 비트를 결정한다.
            if(Math.Abs(peakFrequency - frequency0) < 100)
            {
                bitStringBuilder.Append('0');
            }
            else if(Math.Abs(peakFrequency - frequency1) < 100)
            {
                bitStringBuilder.Append('1');
            }
            else
            {
                bitStringBuilder.Append('?');
            }
        }

        string bitStream = bitStringBuilder.ToString();

        // 비트 스트림에서 시작 및 종료 마커를 찾는다.
        int startMarkerIndex = bitStream.IndexOf(startMarkerBitString);
        int endMarkerIndex   = bitStream.IndexOf(endMarkerBitString);

        if(startMarkerIndex == -1 || endMarkerIndex == -1)
        {
            Console.WriteLine("시작 또는 종료 마커를 찾을 수 없습니다.");

            return;
        }

        int dataStart = startMarkerIndex + startMarkerBitString.Length;
        int dataEnd   = endMarkerIndex;

        string dataBitStream = bitStream.Substring(dataStart, dataEnd - dataStart);

        // 파일 크기를 추출한다. (첫 32비트)
        if(dataBitStream.Length < 32)
        {
            Console.WriteLine("파일 크기 정보를 읽을 수 없습니다.");

            return;
        }

        string fileSizeString = dataBitStream.Substring(0, 32);

        dataBitStream = dataBitStream.Substring(32);

        // 파일 크기를 정수로 변환한다.
        int fileSize = Convert.ToInt32(fileSizeString, 2);

        // 결정할 수 없는 비트를 제거한다.
        dataBitStream = dataBitStream.Replace("?", "");

        // 비트를 바이트로 변환한다.
        int byteCount = dataBitStream.Length / 8;

        byte[] dataByteArray = new byte[byteCount];

        for(int i = 0; i < byteCount; i++)
        {
            string byteBitString = dataBitStream.Substring(i * 8, 8);

            dataByteArray[i] = Convert.ToByte(byteBitString, 2);
        }

        // 파일 크기에 따라 데이터를 자른다.
        if(dataByteArray.Length > fileSize)
        {
            byte[] tempByteArray = new byte[fileSize];

            Array.Copy(dataByteArray, tempByteArray, fileSize);

            dataByteArray = tempByteArray;
        }

        // 복원된 파일을 저장한다.
        File.WriteAllBytes(targetFilePath, dataByteArray);

        Console.WriteLine("디코딩 완료 : " + targetFilePath);
    }

    #endregion
}

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using System;

using System.IO;

using System.Linq;

using System.Numerics;

using System.Text;

using NAudio.Wave;

namespace DECODER;

/// <summary>

/// 디코더

/// </summary>

class Decoder

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Static

//////////////////////////////////////////////////////////////////////////////// Private

#region 다음 2의 거듭 제곱 구하기 - NextPowerOfTwo(value)

/// <summary>

/// 다음 2의 거듭 제곱 구하기

/// </summary>

/// <param name="value">값</param>

/// <returns></returns>

/// <remarks>입력값보다 큰 가장 작은 2의 거듭 제곱을 계산한다.</remarks>

private static int NextPowerOfTwo(int value)

{

int power = 1;

while(power < value)

{

power <<= 1;

}

return power;

}

#endregion

#region 비트 반전하기 - BitReverse(bitValue, bitCount)

/// <summary>

/// 비트 반전하기

/// </summary>

/// <param name="bitValue">비트 값</param>

/// <param name="bitCount">비트 수</param>

/// <returns>반전 비트 값</returns>

private static int BitReverse(int bitValue, int bitCount)

{

int reversed = 0;

for(int i = 0; i < bitCount; i++)

{

int nextBit = (bitValue >> i) & 1;

reversed |= (nextBit << (bitCount - i - 1));

}

return reversed;

}

#endregion

#region FFT 처리하기 - FFT(complexArray)

/// <summary>

/// FFT 처리하기

/// </summary>

/// <param name="complexArray">복소수 배열</param>

private static void FFT(Complex[] complexArray)

{

int complexArrayLength = complexArray.Length;

if(complexArrayLength <= 1)

{

return;

}

// Bit reversal permutation

int m1 = (int)Math.Log(complexArrayLength, 2);

for(int i = 0; i < complexArrayLength; i++)

{

int j = BitReverse(i, m1);

if(j > i)

{

Complex t = complexArray[i];

complexArray[i] = complexArray[j];

complexArray[j] = t;

}

// Cooley-Tukey FFT

for(int s = 1; s <= m1; s++)

{

int m2 = 1 << s;

Complex wm = Complex.Exp(-2.0 * Math.PI * Complex.ImaginaryOne / m2);

for(int k = 0; k < complexArrayLength; k += m2)

{

Complex w = 1;

for(int j = 0; j < m2 / 2; j++)

{

int index1 = k + j;

int index2 = k + j + m2 / 2;

Complex t = w * complexArray[index2];

Complex u = complexArray[index1];

complexArray[index1] = u + t;

complexArray[index2] = u - t;

w *= wm;

}

#endregion

#region 프로그램 시작하기 - Main(argumentArray)

/// <summary>

/// 프로그램 시작하기

/// </summary>

/// <param name="argumentArray">인자 배열</param>

private static void Main(string[] argumentArray)

{

if(argumentArray.Length != 2)

{

Console.WriteLine("사용법 : decoder.exe source.wav target.zip");

return;

}

string sourceFilePath = argumentArray[0];

string targetFilePath = argumentArray[1];

int samplingFrequency = 44100; // 샘플링 주파수

double durationPerBit = 0.01; // 각 비트의 지속 시간 (초)

int sampleCountPerBit = (int)(samplingFrequency * durationPerBit);

int frequency0 = 1000; // '0'에 대한 주파수

int frequency1 = 2000; // '1'에 대한 주파수

// 시작 및 종료 마커를 설정한다.

string startMarkerBitString = "1111000011110000";

string endMarkerBitString = "0000111100001111";

// WAV 파일을 읽는다.

float[] signalArray;

using(AudioFileReader audioFileReader = new(sourceFilePath))

{

int totalSampleCount = (int)audioFileReader.Length / (audioFileReader.WaveFormat.BitsPerSample / 8);

signalArray = new float[totalSampleCount];

int readSampleCount = audioFileReader.Read(signalArray, 0, totalSampleCount);

}

int bitCount = signalArray.Length / sampleCountPerBit;

StringBuilder bitStringBuilder = new StringBuilder();

for(int i = 0; i < bitCount; i++)

{

int start = i * sampleCountPerBit;

int end = start + sampleCountPerBit;

if(end > signalArray.Length)

{

break;

}

float[] segmentArray = new float[sampleCountPerBit];

Array.Copy(signalArray, start, segmentArray, 0, sampleCountPerBit);

// 입력 배열 길이를 가장 가까운 2의 거듭제곱으로 패딩한다.

int paddedLength = NextPowerOfTwo(segmentArray.Length);

Complex[] fftComplexArray = new Complex[paddedLength];

for(int j = 0; j < segmentArray.Length; j++)

{

fftComplexArray[j] = new Complex(segmentArray[j], 0);

}

for(int j = segmentArray.Length; j < paddedLength; j++)

{

fftComplexArray[j] = Complex.Zero;

}

// 주파수 분석을 위한 FFT를 수행한다.

FFT(fftComplexArray);

double[] magnitudeArray = fftComplexArray.Take(paddedLength / 2).Select(c => c.Magnitude).ToArray();

int peakIndex = Array.IndexOf(magnitudeArray, magnitudeArray.Max());

double peakFrequency = (double)peakIndex * samplingFrequency / paddedLength;

// 주파수에 따라 비트를 결정한다.

if(Math.Abs(peakFrequency - frequency0) < 100)

{

bitStringBuilder.Append('0');

}

else if(Math.Abs(peakFrequency - frequency1) < 100)

{

bitStringBuilder.Append('1');

}

else

{

bitStringBuilder.Append('?');

}

string bitStream = bitStringBuilder.ToString();

// 비트 스트림에서 시작 및 종료 마커를 찾는다.

int startMarkerIndex = bitStream.IndexOf(startMarkerBitString);

int endMarkerIndex = bitStream.IndexOf(endMarkerBitString);

if(startMarkerIndex == -1 || endMarkerIndex == -1)

{

Console.WriteLine("시작 또는 종료 마커를 찾을 수 없습니다.");

return;

}

int dataStart = startMarkerIndex + startMarkerBitString.Length;

int dataEnd = endMarkerIndex;

string dataBitStream = bitStream.Substring(dataStart, dataEnd - dataStart);

// 파일 크기를 추출한다. (첫 32비트)

if(dataBitStream.Length < 32)

{

Console.WriteLine("파일 크기 정보를 읽을 수 없습니다.");

return;

}

string fileSizeString = dataBitStream.Substring(0, 32);

dataBitStream = dataBitStream.Substring(32);

// 파일 크기를 정수로 변환한다.

int fileSize = Convert.ToInt32(fileSizeString, 2);

// 결정할 수 없는 비트를 제거한다.

dataBitStream = dataBitStream.Replace("?", "");

// 비트를 바이트로 변환한다.

int byteCount = dataBitStream.Length / 8;

byte[] dataByteArray = new byte[byteCount];

for(int i = 0; i < byteCount; i++)

{

string byteBitString = dataBitStream.Substring(i * 8, 8);

dataByteArray[i] = Convert.ToByte(byteBitString, 2);

}

// 파일 크기에 따라 데이터를 자른다.

if(dataByteArray.Length > fileSize)

{

byte[] tempByteArray = new byte[fileSize];

Array.Copy(dataByteArray, tempByteArray, fileSize);

dataByteArray = tempByteArray;

}

// 복원된 파일을 저장한다.

File.WriteAllBytes(targetFilePath, dataByteArray);

Console.WriteLine("디코딩 완료 : " + targetFilePath);

}

#endregion

}

[Decoder 프로젝트] ▶ requirements.txt


using System;
using System.IO;
using System.Linq;

using NAudio.Wave;

namespace ENCODER;

/// <summary>
/// 인코더
/// </summary>
class Encoder
{
    //////////////////////////////////////////////////////////////////////////////////////////////////// Method
    ////////////////////////////////////////////////////////////////////////////////////////// Static
    //////////////////////////////////////////////////////////////////////////////// Private

    #region 프로그램 시작하기 - Main(argumentArray)

    /// <summary>
    /// 프로그램 시작하기
    /// </summary>
    /// <param name="argumentArray">인자 배열</param>
    private static void Main(string[] argumentArray)
    {
        if(argumentArray.Length != 2)
        {
            Console.WriteLine("사용법 : encoder.exe source.zip target.wav");

            return;
        }

        string sourceFilePath = argumentArray[0];
        string targetFilePath = argumentArray[1];

        // 소스 파일을 읽는다.
        byte[] sourceFileByteArray = File.ReadAllBytes(sourceFilePath);

        int sourceFileSize = sourceFileByteArray.Length;

        // 바이트를 비트로 변환한다.
        string dataBitString = string.Join(string.Empty, sourceFileByteArray.Select(sourceByte => Convert.ToString(sourceByte, 2).PadLeft(8, '0')));

        // 파일 크기를 헤더에 추가한다. (32비트로 표현)
        string fileSizeBitString = Convert.ToString(sourceFileSize, 2).PadLeft(32, '0');

        // 시작 및 종료 마커 문자열을 설정한다.
        string startMarkerString = "1111000011110000";
        string endMarkerString   = "0000111100001111";

        // 전체 비트 스트림을 생성한다.
        string bitStreamString = startMarkerString + fileSizeBitString + dataBitString + endMarkerString;

        // 파라미터를 설정한다.
        int    samplingFrequency = 44100; // 샘플링 주파수
        double durationPerBit    = 0.01;  // 각 비트의 지속 시간 (초)
        int    sampleCountPerBit = (int)(samplingFrequency * durationPerBit);

        int frequency0 = 1000; // '0'에 대한 주파수
        int frequency1 = 2000; // '1'에 대한 주파수

        // 신호를 생성한다.
        float[] signalArray = new float[bitStreamString.Length * sampleCountPerBit];

        int bitStreamStringLength = bitStreamString.Length;

        for(int i = 0; i < bitStreamStringLength; i++)
        {
            char bitCharacter = bitStreamString[i];

            int frequency = bitCharacter == '1' ? frequency1 : frequency0;

            for(int j = 0; j < sampleCountPerBit; j++)
            {
                double t = (double)j / samplingFrequency;

                signalArray[i * sampleCountPerBit + j] = (float)Math.Sin(2 * Math.PI * frequency * t);
            }
        }

        // 신호를 정규화한다.
        float maximumAmplitude = signalArray.Max(x => Math.Abs(x));

        for(int i = 0; i < signalArray.Length; i++)
        {
            signalArray[i] = signalArray[i] / maximumAmplitude;
        }

        // WAV 파일로 저장한다.
        using(WaveFileWriter waveFileWriter = new WaveFileWriter(targetFilePath, new WaveFormat(samplingFrequency, 16, 1)))
        {
            waveFileWriter.WriteSamples(signalArray, 0, signalArray.Length);
        }

        Console.WriteLine("인코딩 완료 : " + targetFilePath);
    }

    #endregion
}

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using System;

using System.IO;

using System.Linq;

using NAudio.Wave;

namespace ENCODER;

/// <summary>

/// 인코더

/// </summary>

class Encoder

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Static

//////////////////////////////////////////////////////////////////////////////// Private

#region 프로그램 시작하기 - Main(argumentArray)

/// <summary>

/// 프로그램 시작하기

/// </summary>

/// <param name="argumentArray">인자 배열</param>

private static void Main(string[] argumentArray)

{

if(argumentArray.Length != 2)

{

Console.WriteLine("사용법 : encoder.exe source.zip target.wav");

return;

}

string sourceFilePath = argumentArray[0];

string targetFilePath = argumentArray[1];

// 소스 파일을 읽는다.

byte[] sourceFileByteArray = File.ReadAllBytes(sourceFilePath);

int sourceFileSize = sourceFileByteArray.Length;

// 바이트를 비트로 변환한다.

string dataBitString = string.Join(string.Empty, sourceFileByteArray.Select(sourceByte => Convert.ToString(sourceByte, 2).PadLeft(8, '0')));

// 파일 크기를 헤더에 추가한다. (32비트로 표현)

string fileSizeBitString = Convert.ToString(sourceFileSize, 2).PadLeft(32, '0');

// 시작 및 종료 마커 문자열을 설정한다.

string startMarkerString = "1111000011110000";

string endMarkerString = "0000111100001111";

// 전체 비트 스트림을 생성한다.

string bitStreamString = startMarkerString + fileSizeBitString + dataBitString + endMarkerString;

// 파라미터를 설정한다.

int samplingFrequency = 44100; // 샘플링 주파수

double durationPerBit = 0.01; // 각 비트의 지속 시간 (초)

int sampleCountPerBit = (int)(samplingFrequency * durationPerBit);

int frequency0 = 1000; // '0'에 대한 주파수

int frequency1 = 2000; // '1'에 대한 주파수

// 신호를 생성한다.

float[] signalArray = new float[bitStreamString.Length * sampleCountPerBit];

int bitStreamStringLength = bitStreamString.Length;

for(int i = 0; i < bitStreamStringLength; i++)

{

char bitCharacter = bitStreamString[i];

int frequency = bitCharacter == '1' ? frequency1 : frequency0;

for(int j = 0; j < sampleCountPerBit; j++)

{

double t = (double)j / samplingFrequency;

signalArray[i * sampleCountPerBit + j] = (float)Math.Sin(2 * Math.PI * frequency * t);

}

// 신호를 정규화한다.

float maximumAmplitude = signalArray.Max(x => Math.Abs(x));

for(int i = 0; i < signalArray.Length; i++)

{

signalArray[i] = signalArray[i] / maximumAmplitude;

}

// WAV 파일로 저장한다.

using(WaveFileWriter waveFileWriter = new WaveFileWriter(targetFilePath, new WaveFormat(samplingFrequency, 16, 1)))

{

waveFileWriter.WriteSamples(signalArray, 0, signalArray.Length);

}

Console.WriteLine("인코딩 완료 : " + targetFilePath);

}

#endregion

}

TestSolution.zip

[C#/WPF] 마이크로폰 볼륨 설정하기

■ 마이크로폰 볼륨을 설정하는 방법을 보여준다. ▶ ControlExtension.cs


using System;
using System.Windows.Controls;
using System.Windows.Threading;

namespace TestProject
{
    /// <summary>
    /// 컨트롤 확장
    /// </summary>
    public static class ControlExtension
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Public

        #region 필요시 UI 스레드에서 호출하기 - InvokeOnUIThreadIfRequired(control, action)

        /// <summary>
        /// 필요시 UI 스레드에서 호출하기
        /// </summary>
        /// <param name="control">컨트롤</param>
        /// <param name="action">액션</param>
        public static void InvokeOnUIThreadIfRequired(this Control control, Action action)
        {
            if(!control.Dispatcher.CheckAccess())
            {
                control.Dispatcher.BeginInvoke
                (
                    DispatcherPriority.Normal,
                    new Action(delegate () { action(); })
                );
            }
            else
            {
                action.Invoke();
            }
        }

        #endregion
    }
}

using System;

using System.Windows.Controls;

using System.Windows.Threading;

namespace TestProject

{

/// <summary>

/// 컨트롤 확장

/// </summary>

public static class ControlExtension

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Static

//////////////////////////////////////////////////////////////////////////////// Public

#region 필요시 UI 스레드에서 호출하기 - InvokeOnUIThreadIfRequired(control, action)

/// <summary>

/// 필요시 UI 스레드에서 호출하기

/// </summary>

/// <param name="control">컨트롤</param>

/// <param name="action">액션</param>

public static void InvokeOnUIThreadIfRequired(this Control control, Action action)

{

if(!control.Dispatcher.CheckAccess())

{

control.Dispatcher.BeginInvoke

(

DispatcherPriority.Normal,

new Action(delegate () { action(); })

);

}

else

{

action.Invoke();

}

#endregion

}

▶ AudioControl.xaml


<UserControl x:Class="TestProject.AudioControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    HorizontalAlignment="Center"
    VerticalAlignment="Center"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <UserControl.Resources>
        <Style x:Key="SliderRepeatButtonStyleKey" TargetType="{x:Type RepeatButton}">
            <Setter Property="OverridesDefaultStyle" Value="true"  />
            <Setter Property="Focusable"             Value="false" />
            <Setter Property="IsTabStop"             Value="false" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type RepeatButton}">
                        <Rectangle Fill="Transparent" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="HorizontalSliderThumbStyleKey" TargetType="{x:Type Thumb}">
            <Setter Property="Width"                 Value="16"    />
            <Setter Property="Height"                Value="16"    />
            <Setter Property="OverridesDefaultStyle" Value="true"  />
            <Setter Property="Focusable"             Value="false" />
            <Setter Property="Foreground"            Value="Gray"  />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Thumb}">
                        <Ellipse
                            StrokeThickness="0.8"
                            Stroke="#ff5e5d5d"
                            Fill="#ffaed1ed" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style TargetType="{x:Type Slider}">
            <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"       />
            <Setter Property="Background"                   Value="Transparent" />
            <Setter Property="Foreground"                   Value="#ffc4c4c4"   />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Slider}">
                        <Border
                            BorderThickness="{TemplateBinding BorderThickness}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            Background="{TemplateBinding Background}"
                            SnapsToDevicePixels="true">
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition MinHeight="{TemplateBinding MinHeight}" Height="Auto" />
                                    <RowDefinition                                         Height="Auto" />
                                </Grid.RowDefinitions>
                                <Border Grid.Row="1"
                                    VerticalAlignment="Center"
                                    Margin="5 0"
                                    Height="10"
                                    CornerRadius="1">
                                    <Grid>
                                        <Border
                                            CornerRadius="0.5"
                                            Background="#fff7f4f4"
                                            Opacity="0.215" />
                                        <Border
                                            Margin="0 0 0.3 0.3"
                                            CornerRadius="0.5"
                                            Background="#ff132e50"
                                            Opacity="0.715" />
                                    </Grid>
                                </Border>
                                <Track Name="PART_Track" Grid.Row="1">
                                    <Track.DecreaseRepeatButton>
                                        <RepeatButton
                                            Style="{StaticResource SliderRepeatButtonStyleKey}"
                                            Command="{x:Static Slider.DecreaseLarge}" />
                                    </Track.DecreaseRepeatButton>
                                    <Track.IncreaseRepeatButton>
                                        <RepeatButton
                                            Style="{StaticResource SliderRepeatButtonStyleKey}"
                                            Command="{x:Static Slider.IncreaseLarge}" />
                                    </Track.IncreaseRepeatButton>
                                    <Track.Thumb>
                                        <Thumb Style="{StaticResource HorizontalSliderThumbStyleKey}" />
                                    </Track.Thumb>
                                </Track>
                            </Grid>
                        </Border>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="Opacity" Value="0.5" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <SolidColorBrush x:Key="CustomProgressBarBackgroundSolidColorBrushKey"
            Color="#55ffffff" />
        <Style x:Key="ProgressBarStyleKey" TargetType="{x:Type ProgressBar}">
            <Setter Property="Height"          Value="5"   />
            <Setter Property="BorderThickness" Value="0"   />
            <Setter Property="Background"      Value="{StaticResource CustomProgressBarBackgroundSolidColorBrushKey}" />
            <Setter Property="Minimum"         Value="0"   />
            <Setter Property="Maximum"         Value="100" />
        </Style>
    </UserControl.Resources>
    <Border
        BorderThickness="1"
        BorderBrush="Black"
        Padding="1">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="Auto" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
                <ColumnDefinition Width="Auto" />
            </Grid.ColumnDefinitions>
            <ComboBox Name="microphoneComboBox" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3"
                Width="250"
                Height="25" />
            <Button Name="openSoundControlButton" Grid.Row="0" Grid.RowSpan="2" Grid.Column="3"
                Margin="5 0 0 0"
                Width="70"
                Content="제어판" />
            <Button Name="muteMicrophoneButton" Grid.Row="1" Grid.Column="0"
                Margin="0 5 0 5"
                Width="20"
                Height="20"
                Content=""
                Background="#ff4fed82" />
            <Slider Name="volumeSlider" Grid.Row="1" Grid.Column="1"
                VerticalAlignment="Center"
                Width="90"
                Maximum="100"
                TickFrequency="10"
                SmallChange="1"
                Value="-1" />
            <ProgressBar Name="volumeProgressBar" Grid.Row="1" Grid.Column="2"
                Style="{DynamicResource ProgressBarStyleKey}"
                VerticalAlignment="Center"
                Width="80"
                Height="20"
                Background="#55050000"
                IsIndeterminate="False"
                Value="50" />
        </Grid>
    </Border>
</UserControl>

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<UserControl x:Class="TestProject.AudioControl"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

HorizontalAlignment="Center"

VerticalAlignment="Center"

FontFamily="나눔고딕코딩"

FontSize="16">

<UserControl.Resources>

<Setter.Value>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

<Setter.Value>

<Ellipse

StrokeThickness="0.8"

Stroke="#ff5e5d5d"

Fill="#ffaed1ed" />

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

<Setter.Value>

<Border

BorderThickness="{TemplateBinding BorderThickness}"

BorderBrush="{TemplateBinding BorderBrush}"

Background="{TemplateBinding Background}"

SnapsToDevicePixels="true">

<Grid>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Border Grid.Row="1"

VerticalAlignment="Center"

Margin="5 0"

Height="10"

CornerRadius="1">

<Grid>

<Border

CornerRadius="0.5"

Background="#fff7f4f4"

Opacity="0.215" />

<Border

Margin="0 0 0.3 0.3"

CornerRadius="0.5"

Background="#ff132e50"

Opacity="0.715" />

</Grid>

</Border>

<Track.DecreaseRepeatButton>

<RepeatButton

Style="{StaticResource SliderRepeatButtonStyleKey}"

Command="{x:Static Slider.DecreaseLarge}" />

</Track.DecreaseRepeatButton>

<Track.IncreaseRepeatButton>

<RepeatButton

Style="{StaticResource SliderRepeatButtonStyleKey}"

Command="{x:Static Slider.IncreaseLarge}" />

</Track.IncreaseRepeatButton>

<Track.Thumb>

</Track.Thumb>

</Track>

</Grid>

</Border>

<ControlTemplate.Triggers>

</Trigger>

</ControlTemplate.Triggers>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

<SolidColorBrush x:Key="CustomProgressBarBackgroundSolidColorBrushKey"

Color="#55ffffff" />

</Style>

</UserControl.Resources>

<Border

BorderThickness="1"

BorderBrush="Black"

Padding="1">

<Grid>

<Grid.RowDefinitions>

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

</Grid.ColumnDefinitions>

<ComboBox Name="microphoneComboBox" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3"

Width="250"

Height="25" />

<Button Name="openSoundControlButton" Grid.Row="0" Grid.RowSpan="2" Grid.Column="3"

Margin="5 0 0 0"

Width="70"

Content="제어판" />

<Button Name="muteMicrophoneButton" Grid.Row="1" Grid.Column="0"

Margin="0 5 0 5"

Width="20"

Height="20"

Content=""

Background="#ff4fed82" />

<Slider Name="volumeSlider" Grid.Row="1" Grid.Column="1"

VerticalAlignment="Center"

Width="90"

Maximum="100"

TickFrequency="10"

SmallChange="1"

Value="-1" />

<ProgressBar Name="volumeProgressBar" Grid.Row="1" Grid.Column="2"

Style="{DynamicResource ProgressBarStyleKey}"

VerticalAlignment="Center"

Width="80"

Height="20"

Background="#55050000"

IsIndeterminate="False"

Value="50" />

</Grid>

</Border>

</UserControl>

▶ AudioControl.xaml.cs


using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

using AudioSwitcher.AudioApi;
using AudioSwitcher.AudioApi.CoreAudio;
using AudioSwitcher.AudioApi.Observables;

using NAudio.CoreAudioApi;
using NAudio.Wave;

namespace TestProject
{
    /// <summary>
    /// 오디오 컨트롤
    /// </summary>
    public partial class AudioControl : UserControl
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 코어 오디오 장치 리스트
        /// </summary>
        private List<CoreAudioDevice> coreAudioDeviceList = null;

        /// <summary>
        /// 디폴트 코어 오디오 장치
        /// </summary>
        private CoreAudioDevice defaultCoreAudioDevice = null;

        /// <summary>
        /// 코어 오디오 컨트롤러
        /// </summary>
        private CoreAudioController coreAudioController = null;

        /// <summary>
        /// Disposable 리스트
        /// </summary>
        private List<IDisposable> disposableList = null;

        /// <summary>
        /// 볼륨 변경 액션
        /// </summary>
        private Action<DeviceVolumeChangedArgs> changeVolumeAction = null;

        /// <summary>
        /// 음소거 변경 액션
        /// </summary>
        private Action<DeviceMuteChangedArgs> changeMuteMicrophoneAction = null;

        /// <summary>
        /// 디폴트 장치 변경 액션
        /// </summary>
        private Action<DefaultDeviceChangedArgs> changeDefaultDeviceAction = null;

        /// <summary>
        /// 장치 상태 변경 액션
        /// </summary>
        private Action<DeviceStateChangedArgs> changeDeviceStateAction = null;

        /// <summary>
        /// 멀티미디어 장치 열거자
        /// </summary>
        private MMDeviceEnumerator mmDeviceEnumerator = null;

        /// <summary>
        /// 웨이브 입력 이벤트
        /// </summary>
        private WaveInEvent waveInEvent = null;

        /// <summary>
        /// 중단 여부
        /// </summary>
        private bool stopped = false;

        /// <summary>
        /// 최대 오디오 값
        /// </summary>
        private double maximumAudioValue = 0;

        /// <summary>
        /// 마지막 오디오 값
        /// </summary>
        private double lastAudioValue = 0;

        /// <summary>
        /// 샘플 비율
        /// </summary>
        private const int SAMPLE_RATE = 44100;

        /// <summary>
        /// 버퍼 샘플 수
        /// </summary>
        private const int BUFFER_SAMPLE_COUNT = 1024;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - AudioControl()

        /// <summary>
        /// 생성자
        /// </summary>
        public AudioControl()
        {
            InitializeComponent();

            Loaded                                   += UserControl_Loaded;
            Unloaded                                 += UserControl_Unloaded;
            this.microphoneComboBox.SelectionChanged += microphoneComboBox_SelectionChanged;
            this.openSoundControlButton.Click        += openSoundControlButton_Click;
            this.muteMicrophoneButton.Click          += muteMicrophoneButton_Click;
            this.volumeSlider.ValueChanged           += volumeSlider_ValueChanged;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 사용자 컨트롤 로드시 처리하기 - UserControl_Loaded(sender, e)

        /// <summary>
        /// 사용자 컨트롤 로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            this.microphoneComboBox.Cursor = Cursors.Hand;

            this.muteMicrophoneButton.Cursor = Cursors.Hand;

            this.volumeSlider.Cursor  = Cursors.Hand;
            this.volumeSlider.Maximum = 100;
            this.volumeSlider.Value   = 0;

            this.volumeProgressBar.Value = 0;

            this.openSoundControlButton.Cursor = Cursors.Hand;

            this.changeVolumeAction         = ChangeVolume;
            this.changeMuteMicrophoneAction = ChangeMuteMicrophone;
            this.changeDefaultDeviceAction  = ChangeDefaultDevice;
            this.changeDeviceStateAction    = ChangeDeviceState;

            this.disposableList = new List<IDisposable>();

            this.mmDeviceEnumerator = new MMDeviceEnumerator();

            this.coreAudioController = new CoreAudioController();

            SetCoreAudioDeviceList();

            SetControl();
        }

        #endregion
        #region 사용자 컨트롤 언로드시 처리하기 - UserControl_Unloaded(sender, e)

        /// <summary>
        /// 사용자 컨트롤 언로드시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void UserControl_Unloaded(object sender, RoutedEventArgs e)
        {
            if(this.defaultCoreAudioDevice != null)
            {
                this.defaultCoreAudioDevice.Dispose();
            }

            if(this.coreAudioController != null)
            {
                this.coreAudioController.Dispose();
            }

            if(this.mmDeviceEnumerator != null)
            {
                this.mmDeviceEnumerator.Dispose();
            }

            if(this.waveInEvent != null)
            {
                this.waveInEvent.Dispose();
            }
        }

        #endregion
        #region 마이크로폰 콤보 박스 선택 변경시 처리하기 - microphoneComboBox_SelectionChanged(sender, e)

        /// <summary>
        /// 마이크로폰 콤보 박스 선택 변경시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void microphoneComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if(this.microphoneComboBox.SelectedIndex > -1)
            {
                if(!this.defaultCoreAudioDevice.FullName.Equals(this.microphoneComboBox.SelectedItem.ToString()))
                {
                    CoreAudioDevice coreAudioDevice = this.coreAudioDeviceList.Find(x => x.FullName.Equals(this.microphoneComboBox.SelectedItem.ToString()));

                    if(coreAudioDevice != null)
                    {
                        this.coreAudioController.SetDefaultDevice(coreAudioDevice);
                    }
                }
            }
        }

        #endregion
        #region 사운드 컨트롤 열기 버튼 클릭시 처리하기 - openSoundControlButton_Click(sender, e)

        /// <summary>
        /// 사운드 컨트롤 열기 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void openSoundControlButton_Click(object sender, RoutedEventArgs e)
        {
            // 제어판/소리/녹음 탭을 연다(마지막 0은 재생 탭, 1은 녹음 탭)
            Process.Start("rundll32", "Shell32.dll,Control_RunDLL Mmsys.cpl,,1");
        }

        #endregion
        #region 마이크로폰 음소거 버튼 클릭시 처리하기 - muteMicrophoneButton_Click(sender, e)

        /// <summary>
        /// 마이크로폰 음소거 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void muteMicrophoneButton_Click(object sender, RoutedEventArgs e)
        {
            if(this.defaultCoreAudioDevice != null)
            {
                this.defaultCoreAudioDevice.Mute(!this.defaultCoreAudioDevice.IsMuted);
            }
        }

        #endregion
        #region 볼륨 슬라이더 값 변경시 처리하기 - volumeSlider_ValueChanged(sender, e)

        /// <summary>
        /// 볼륨 슬라이더 값 변경시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void volumeSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            if(this.defaultCoreAudioDevice != null)
            {
                this.defaultCoreAudioDevice.Volume = (int)e.NewValue;
            }
        }

        #endregion

        #region 웨이브 입력 이벤트 데이터 이용 가능시 처리하기 - waveInEvent_DataAvailable(sender, e)

        /// <summary>
        /// 웨이브 입력 이벤트 데이터 이용 가능시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void waveInEvent_DataAvailable(object sender, WaveInEventArgs e)
        {
            float maximum = 0;

            for(int i = 0; i < e.BytesRecorded; i += 2)
            {
                short sample = (short)((e.Buffer[i + 1] << 8) | e.Buffer[i + 0]);

                float sampleFloat = sample / 32768f;

                if(sampleFloat < 0)
                {
                    sampleFloat = -sampleFloat;
                }

                if(sampleFloat > maximum)
                {
                    maximum = sampleFloat;
                }
            }

            if(maximum > this.maximumAudioValue)
            {
                this.maximumAudioValue = (double)maximum;
            }

            this.lastAudioValue = maximum;

            double fraction = this.lastAudioValue / this.maximumAudioValue;

            this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = (int)(fraction * this.volumeProgressBar.Width));
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////// Function

        #region Disposable 리스트 지우기 - ClearDisposableList()

        /// <summary>
        /// Disposable 리스트 지우기
        /// </summary>
        private void ClearDisposableList()
        {
            if(this.disposableList != null)
            {
                if(this.disposableList.Count > 0)
                {
                    foreach(IDisposable disposable in this.disposableList)
                    {
                        disposable.Dispose();
                    }
                }

                this.disposableList.Clear();
            }
        }

        #endregion
        #region 코어 오디어 장치 리스트 설정하기 - SetCoreAudioDeviceList()

        /// <summary>
        /// 코어 오디어 장치 리스트 설정하기
        /// </summary>
        private void SetCoreAudioDeviceList()
        {
            if(this.coreAudioDeviceList == null)
            {
                this.coreAudioDeviceList = new List<CoreAudioDevice>();
            }
            else
            {
                this.coreAudioDeviceList.Clear();
            }

            IEnumerable<CoreAudioDevice> deviceEnumerable = this.coreAudioController.GetCaptureDevices().Where
            (
                device => !device.FullName.Contains("Unknown") && device.State.Equals(AudioSwitcher.AudioApi.DeviceState.Active)
            );

            foreach(CoreAudioDevice coreAudioDevice in deviceEnumerable)
            {
                this.coreAudioDeviceList.Add(coreAudioDevice);
            }

            if(this.coreAudioDeviceList.Count > 0)
            {
                ClearDisposableList();

                this.defaultCoreAudioDevice = this.coreAudioController.DefaultCaptureDevice;

                for(int i = 0; i < this.coreAudioDeviceList.Count; i++)
                {
                    CoreAudioDevice device = this.coreAudioDeviceList[i];

                    this.disposableList.Add(ObservableExtensions.Subscribe(device.VolumeChanged , changeVolumeAction        ));
                    this.disposableList.Add(ObservableExtensions.Subscribe(device.MuteChanged   , changeMuteMicrophoneAction));
                    this.disposableList.Add(ObservableExtensions.Subscribe(device.DefaultChanged, changeDefaultDeviceAction ));
                    this.disposableList.Add(ObservableExtensions.Subscribe(device.StateChanged  , changeDeviceStateAction   ));
                }
            }
        }

        #endregion
        #region 장치 인덱스 구하기 - GetDeviceIndex()

        /// <summary>
        /// 장치 인덱스 구하기
        /// </summary>
        /// <returns>장치 인덱스</returns>
        private int? GetDeviceIndex()
        {
            MMDevice device = this.mmDeviceEnumerator.GetDefaultAudioEndpoint
            (
                DataFlow.Capture,
                NAudio.CoreAudioApi.Role.Multimedia
            );

            int? deviceIndex = 0;

            if(device != null)
            {
                for(int i = 0; i < WaveIn.DeviceCount; i++)
                {
                    if(device.FriendlyName.Equals(WaveIn.GetCapabilities(i).ProductName))
                    {
                        deviceIndex = i;

                        break;
                    }
                }
            }
            else
            {
                return null;
            }

            return deviceIndex;
        }

        #endregion
        #region 웨이브 입력 이벤트 설정하기 - SetWaveInEvent(waveInEvent)

        /// <summary>
        /// 웨이브 입력 이벤트 설정하기
        /// </summary>
        /// <param name="waveInEvent">웨이브 입력 이벤트</param>
        private void SetWaveInEvent(ref WaveInEvent waveInEvent)
        {
            int? deviceIndex = GetDeviceIndex();

            if(deviceIndex != null)
            {
                waveInEvent = new WaveInEvent();

                waveInEvent.DeviceNumber       = (int)deviceIndex;
                waveInEvent.WaveFormat         = new WaveFormat(44100, 16, 1);
                waveInEvent.BufferMilliseconds = (int)((double)BUFFER_SAMPLE_COUNT / (double)SAMPLE_RATE * 1000.0);

                waveInEvent.DataAvailable    += waveInEvent_DataAvailable;
                waveInEvent.RecordingStopped += (sender, e) => this.stopped = false;

                this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = 0);
            }
        }

        #endregion
        #region 컨트롤 설정하기 - SetControl()

        /// <summary>
        /// 컨트롤 설정하기
        /// </summary>
        private void SetControl()
        {
            try
            {
                lock(this.microphoneComboBox)
                {
                    this.InvokeOnUIThreadIfRequired(() => this.microphoneComboBox.Items.Clear());

                    if(this.coreAudioDeviceList != null && this.coreAudioDeviceList.Count > 0 && this.defaultCoreAudioDevice != null)
                    {
                        Action<int> action = (count) =>
                        {
                            for(int i = 0; i < count; i++)
                            {
                                this.microphoneComboBox.Items.Add(this.coreAudioDeviceList[i].FullName);
                            }

                            this.microphoneComboBox.SelectedIndex = this.coreAudioDeviceList.IndexOf(this.defaultCoreAudioDevice);
                        };

                        this.InvokeOnUIThreadIfRequired(() => action(this.coreAudioDeviceList.Count));

                        if(this.waveInEvent == null)
                        {
                            SetWaveInEvent(ref this.waveInEvent);
                        }

                        if((int)this.defaultCoreAudioDevice.Volume > -1)
                        {
                            this.InvokeOnUIThreadIfRequired(() => this.volumeSlider.Value = (int)this.defaultCoreAudioDevice.Volume);
                        }

                        if(this.defaultCoreAudioDevice.IsMuted)
                        {
                            this.InvokeOnUIThreadIfRequired(() => this.muteMicrophoneButton.Background = (SolidColorBrush)new BrushConverter().ConvertFromString("red"));

                            if(this.waveInEvent != null)
                            {
                                this.waveInEvent.StopRecording();

                                this.stopped = false;

                                this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = 0);
                            }
                        }
                        else
                        {
                            this.InvokeOnUIThreadIfRequired(() => this.muteMicrophoneButton.Background = (SolidColorBrush)new BrushConverter().ConvertFromString("green"));

                            if(this.waveInEvent != null && !this.stopped)
                            {
                                this.waveInEvent.StartRecording();

                                this.stopped = true;
                            }
                        }
                    }
                    else
                    {
                        this.InvokeOnUIThreadIfRequired(() => this.microphoneComboBox.SelectedIndex = -1);
                    }
                }
            }
            catch(Exception exception)
            {
                MessageBox.Show(exception.ToString());
            }
        }

        #endregion

        #region 볼륨 변경하기 - ChangeVolume(e)

        /// <summary>
        /// 볼륨 변경하기
        /// </summary>
        /// <param name="e">이벤트 인자</param>
        private void ChangeVolume(DeviceVolumeChangedArgs e)
        {
            if(e.Device.FullName.Equals(this.defaultCoreAudioDevice.FullName))
            {
                this.InvokeOnUIThreadIfRequired(() => this.volumeSlider.Value = (int)e.Volume);
            }
        }

        #endregion
        #region 마이크로폼 음소거 변경하기 - ChangeMuteMicrophone(e)

        /// <summary>
        /// 마이크로폼 음소거 변경하기
        /// </summary>
        /// <param name="e">이벤트 인자</param>
        private void ChangeMuteMicrophone(DeviceMuteChangedArgs e)
        {
            if(e.Device.FullName.Equals(this.defaultCoreAudioDevice.FullName))
            {
                SetCoreAudioDeviceList();

                SetControl();
            }
        }

        #endregion
        #region 디폴트 장치 변경하기 - ChangeDefaultDevice(e)

        /// <summary>
        /// 디폴트 장치 변경하기
        /// </summary>
        /// <param name="e">이벤트 인자</param>
        private void ChangeDefaultDevice(DefaultDeviceChangedArgs e)
        {
            if(((CoreAudioDevice)e.Device).IsDefaultDevice)
            {
                if(this.waveInEvent != null)
                {
                    this.waveInEvent.StopRecording();

                    this.waveInEvent.DataAvailable -= waveInEvent_DataAvailable;

                    this.waveInEvent = null;
                }

                SetCoreAudioDeviceList();

                SetControl();
            }
        }

        #endregion
        #region 장치 상태 변경하기 - ChangeDeviceState(e)

        /// <summary>
        /// 장치 상태 변경하기
        /// </summary>
        /// <param name="e">이벤트 인자</param>
        private void ChangeDeviceState(DeviceStateChangedArgs e)
        {
            this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = 0);

            if(((CoreAudioDevice)e.Device).IsDefaultDevice)
            {
                if(this.waveInEvent != null)
                {
                    this.waveInEvent.StopRecording();

                    this.waveInEvent.DataAvailable -= waveInEvent_DataAvailable;

                    this.waveInEvent = null;
                }
            }

            SetCoreAudioDeviceList();

            SetControl();
        }

        #endregion
    }
}

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using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Input;

using System.Windows.Media;

using AudioSwitcher.AudioApi;

using AudioSwitcher.AudioApi.CoreAudio;

using AudioSwitcher.AudioApi.Observables;

using NAudio.CoreAudioApi;

using NAudio.Wave;

namespace TestProject

{

/// <summary>

/// 오디오 컨트롤

/// </summary>

public partial class AudioControl : UserControl

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 코어 오디오 장치 리스트

/// </summary>

private List<CoreAudioDevice> coreAudioDeviceList = null;

/// <summary>

/// 디폴트 코어 오디오 장치

/// </summary>

private CoreAudioDevice defaultCoreAudioDevice = null;

/// <summary>

/// 코어 오디오 컨트롤러

/// </summary>

private CoreAudioController coreAudioController = null;

/// <summary>

/// Disposable 리스트

/// </summary>

private List<IDisposable> disposableList = null;

/// <summary>

/// 볼륨 변경 액션

/// </summary>

private Action<DeviceVolumeChangedArgs> changeVolumeAction = null;

/// <summary>

/// 음소거 변경 액션

/// </summary>

private Action<DeviceMuteChangedArgs> changeMuteMicrophoneAction = null;

/// <summary>

/// 디폴트 장치 변경 액션

/// </summary>

private Action<DefaultDeviceChangedArgs> changeDefaultDeviceAction = null;

/// <summary>

/// 장치 상태 변경 액션

/// </summary>

private Action<DeviceStateChangedArgs> changeDeviceStateAction = null;

/// <summary>

/// 멀티미디어 장치 열거자

/// </summary>

private MMDeviceEnumerator mmDeviceEnumerator = null;

/// <summary>

/// 웨이브 입력 이벤트

/// </summary>

private WaveInEvent waveInEvent = null;

/// <summary>

/// 중단 여부

/// </summary>

private bool stopped = false;

/// <summary>

/// 최대 오디오 값

/// </summary>

private double maximumAudioValue = 0;

/// <summary>

/// 마지막 오디오 값

/// </summary>

private double lastAudioValue = 0;

/// <summary>

/// 샘플 비율

/// </summary>

private const int SAMPLE_RATE = 44100;

/// <summary>

/// 버퍼 샘플 수

/// </summary>

private const int BUFFER_SAMPLE_COUNT = 1024;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - AudioControl()

/// <summary>

/// 생성자

/// </summary>

public AudioControl()

{

InitializeComponent();

Loaded += UserControl_Loaded;

Unloaded += UserControl_Unloaded;

this.microphoneComboBox.SelectionChanged += microphoneComboBox_SelectionChanged;

this.openSoundControlButton.Click += openSoundControlButton_Click;

this.muteMicrophoneButton.Click += muteMicrophoneButton_Click;

this.volumeSlider.ValueChanged += volumeSlider_ValueChanged;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Private

//////////////////////////////////////////////////////////////////////////////// Event

#region 사용자 컨트롤 로드시 처리하기 - UserControl_Loaded(sender, e)

/// <summary>

/// 사용자 컨트롤 로드시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void UserControl_Loaded(object sender, RoutedEventArgs e)

{

this.microphoneComboBox.Cursor = Cursors.Hand;

this.muteMicrophoneButton.Cursor = Cursors.Hand;

this.volumeSlider.Cursor = Cursors.Hand;

this.volumeSlider.Maximum = 100;

this.volumeSlider.Value = 0;

this.volumeProgressBar.Value = 0;

this.openSoundControlButton.Cursor = Cursors.Hand;

this.changeVolumeAction = ChangeVolume;

this.changeMuteMicrophoneAction = ChangeMuteMicrophone;

this.changeDefaultDeviceAction = ChangeDefaultDevice;

this.changeDeviceStateAction = ChangeDeviceState;

this.disposableList = new List<IDisposable>();

this.mmDeviceEnumerator = new MMDeviceEnumerator();

this.coreAudioController = new CoreAudioController();

SetCoreAudioDeviceList();

SetControl();

}

#endregion

#region 사용자 컨트롤 언로드시 처리하기 - UserControl_Unloaded(sender, e)

/// <summary>

/// 사용자 컨트롤 언로드시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void UserControl_Unloaded(object sender, RoutedEventArgs e)

{

if(this.defaultCoreAudioDevice != null)

{

this.defaultCoreAudioDevice.Dispose();

}

if(this.coreAudioController != null)

{

this.coreAudioController.Dispose();

}

if(this.mmDeviceEnumerator != null)

{

this.mmDeviceEnumerator.Dispose();

}

if(this.waveInEvent != null)

{

this.waveInEvent.Dispose();

}

#endregion

#region 마이크로폰 콤보 박스 선택 변경시 처리하기 - microphoneComboBox_SelectionChanged(sender, e)

/// <summary>

/// 마이크로폰 콤보 박스 선택 변경시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void microphoneComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)

{

if(this.microphoneComboBox.SelectedIndex > -1)

{

if(!this.defaultCoreAudioDevice.FullName.Equals(this.microphoneComboBox.SelectedItem.ToString()))

{

CoreAudioDevice coreAudioDevice = this.coreAudioDeviceList.Find(x => x.FullName.Equals(this.microphoneComboBox.SelectedItem.ToString()));

if(coreAudioDevice != null)

{

this.coreAudioController.SetDefaultDevice(coreAudioDevice);

}

#endregion

#region 사운드 컨트롤 열기 버튼 클릭시 처리하기 - openSoundControlButton_Click(sender, e)

/// <summary>

/// 사운드 컨트롤 열기 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void openSoundControlButton_Click(object sender, RoutedEventArgs e)

{

// 제어판/소리/녹음 탭을 연다(마지막 0은 재생 탭, 1은 녹음 탭)

Process.Start("rundll32", "Shell32.dll,Control_RunDLL Mmsys.cpl,,1");

}

#endregion

#region 마이크로폰 음소거 버튼 클릭시 처리하기 - muteMicrophoneButton_Click(sender, e)

/// <summary>

/// 마이크로폰 음소거 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void muteMicrophoneButton_Click(object sender, RoutedEventArgs e)

{

if(this.defaultCoreAudioDevice != null)

{

this.defaultCoreAudioDevice.Mute(!this.defaultCoreAudioDevice.IsMuted);

}

#endregion

#region 볼륨 슬라이더 값 변경시 처리하기 - volumeSlider_ValueChanged(sender, e)

/// <summary>

/// 볼륨 슬라이더 값 변경시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void volumeSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)

{

if(this.defaultCoreAudioDevice != null)

{

this.defaultCoreAudioDevice.Volume = (int)e.NewValue;

}

#endregion

#region 웨이브 입력 이벤트 데이터 이용 가능시 처리하기 - waveInEvent_DataAvailable(sender, e)

/// <summary>

/// 웨이브 입력 이벤트 데이터 이용 가능시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void waveInEvent_DataAvailable(object sender, WaveInEventArgs e)

{

float maximum = 0;

for(int i = 0; i < e.BytesRecorded; i += 2)

{

short sample = (short)((e.Buffer[i + 1] << 8) | e.Buffer[i + 0]);

float sampleFloat = sample / 32768f;

if(sampleFloat < 0)

{

sampleFloat = -sampleFloat;

}

if(sampleFloat > maximum)

{

maximum = sampleFloat;

}

if(maximum > this.maximumAudioValue)

{

this.maximumAudioValue = (double)maximum;

}

this.lastAudioValue = maximum;

double fraction = this.lastAudioValue / this.maximumAudioValue;

this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = (int)(fraction * this.volumeProgressBar.Width));

}

#endregion

//////////////////////////////////////////////////////////////////////////////// Function

#region Disposable 리스트 지우기 - ClearDisposableList()

/// <summary>

/// Disposable 리스트 지우기

/// </summary>

private void ClearDisposableList()

{

if(this.disposableList != null)

{

if(this.disposableList.Count > 0)

{

foreach(IDisposable disposable in this.disposableList)

{

disposable.Dispose();

}

this.disposableList.Clear();

}

#endregion

#region 코어 오디어 장치 리스트 설정하기 - SetCoreAudioDeviceList()

/// <summary>

/// 코어 오디어 장치 리스트 설정하기

/// </summary>

private void SetCoreAudioDeviceList()

{

if(this.coreAudioDeviceList == null)

{

this.coreAudioDeviceList = new List<CoreAudioDevice>();

}

else

{

this.coreAudioDeviceList.Clear();

}

IEnumerable<CoreAudioDevice> deviceEnumerable = this.coreAudioController.GetCaptureDevices().Where

(

device => !device.FullName.Contains("Unknown") && device.State.Equals(AudioSwitcher.AudioApi.DeviceState.Active)

);

foreach(CoreAudioDevice coreAudioDevice in deviceEnumerable)

{

this.coreAudioDeviceList.Add(coreAudioDevice);

}

if(this.coreAudioDeviceList.Count > 0)

{

ClearDisposableList();

this.defaultCoreAudioDevice = this.coreAudioController.DefaultCaptureDevice;

for(int i = 0; i < this.coreAudioDeviceList.Count; i++)

{

CoreAudioDevice device = this.coreAudioDeviceList[i];

this.disposableList.Add(ObservableExtensions.Subscribe(device.VolumeChanged , changeVolumeAction ));

this.disposableList.Add(ObservableExtensions.Subscribe(device.MuteChanged , changeMuteMicrophoneAction));

this.disposableList.Add(ObservableExtensions.Subscribe(device.DefaultChanged, changeDefaultDeviceAction ));

this.disposableList.Add(ObservableExtensions.Subscribe(device.StateChanged , changeDeviceStateAction ));

}

#endregion

#region 장치 인덱스 구하기 - GetDeviceIndex()

/// <summary>

/// 장치 인덱스 구하기

/// </summary>

/// <returns>장치 인덱스</returns>

private int? GetDeviceIndex()

{

MMDevice device = this.mmDeviceEnumerator.GetDefaultAudioEndpoint

(

DataFlow.Capture,

NAudio.CoreAudioApi.Role.Multimedia

);

int? deviceIndex = 0;

if(device != null)

{

for(int i = 0; i < WaveIn.DeviceCount; i++)

{

if(device.FriendlyName.Equals(WaveIn.GetCapabilities(i).ProductName))

{

deviceIndex = i;

break;

}

else

{

return null;

}

return deviceIndex;

}

#endregion

#region 웨이브 입력 이벤트 설정하기 - SetWaveInEvent(waveInEvent)

/// <summary>

/// 웨이브 입력 이벤트 설정하기

/// </summary>

/// <param name="waveInEvent">웨이브 입력 이벤트</param>

private void SetWaveInEvent(ref WaveInEvent waveInEvent)

{

int? deviceIndex = GetDeviceIndex();

if(deviceIndex != null)

{

waveInEvent = new WaveInEvent();

waveInEvent.DeviceNumber = (int)deviceIndex;

waveInEvent.WaveFormat = new WaveFormat(44100, 16, 1);

waveInEvent.BufferMilliseconds = (int)((double)BUFFER_SAMPLE_COUNT / (double)SAMPLE_RATE * 1000.0);

waveInEvent.DataAvailable += waveInEvent_DataAvailable;

waveInEvent.RecordingStopped += (sender, e) => this.stopped = false;

this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = 0);

}

#endregion

#region 컨트롤 설정하기 - SetControl()

/// <summary>

/// 컨트롤 설정하기

/// </summary>

private void SetControl()

{

try

{

lock(this.microphoneComboBox)

{

this.InvokeOnUIThreadIfRequired(() => this.microphoneComboBox.Items.Clear());

if(this.coreAudioDeviceList != null && this.coreAudioDeviceList.Count > 0 && this.defaultCoreAudioDevice != null)

{

Action<int> action = (count) =>

{

for(int i = 0; i < count; i++)

{

this.microphoneComboBox.Items.Add(this.coreAudioDeviceList[i].FullName);

}

this.microphoneComboBox.SelectedIndex = this.coreAudioDeviceList.IndexOf(this.defaultCoreAudioDevice);

};

this.InvokeOnUIThreadIfRequired(() => action(this.coreAudioDeviceList.Count));

if(this.waveInEvent == null)

{

SetWaveInEvent(ref this.waveInEvent);

}

if((int)this.defaultCoreAudioDevice.Volume > -1)

{

this.InvokeOnUIThreadIfRequired(() => this.volumeSlider.Value = (int)this.defaultCoreAudioDevice.Volume);

}

if(this.defaultCoreAudioDevice.IsMuted)

{

this.InvokeOnUIThreadIfRequired(() => this.muteMicrophoneButton.Background = (SolidColorBrush)new BrushConverter().ConvertFromString("red"));

if(this.waveInEvent != null)

{

this.waveInEvent.StopRecording();

this.stopped = false;

this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = 0);

}

else

{

this.InvokeOnUIThreadIfRequired(() => this.muteMicrophoneButton.Background = (SolidColorBrush)new BrushConverter().ConvertFromString("green"));

if(this.waveInEvent != null && !this.stopped)

{

this.waveInEvent.StartRecording();

this.stopped = true;

}

else

{

this.InvokeOnUIThreadIfRequired(() => this.microphoneComboBox.SelectedIndex = -1);

}

catch(Exception exception)

{

MessageBox.Show(exception.ToString());

}

#endregion

#region 볼륨 변경하기 - ChangeVolume(e)

/// <summary>

/// 볼륨 변경하기

/// </summary>

/// <param name="e">이벤트 인자</param>

private void ChangeVolume(DeviceVolumeChangedArgs e)

{

if(e.Device.FullName.Equals(this.defaultCoreAudioDevice.FullName))

{

this.InvokeOnUIThreadIfRequired(() => this.volumeSlider.Value = (int)e.Volume);

}

#endregion

#region 마이크로폼 음소거 변경하기 - ChangeMuteMicrophone(e)

/// <summary>

/// 마이크로폼 음소거 변경하기

/// </summary>

/// <param name="e">이벤트 인자</param>

private void ChangeMuteMicrophone(DeviceMuteChangedArgs e)

{

if(e.Device.FullName.Equals(this.defaultCoreAudioDevice.FullName))

{

SetCoreAudioDeviceList();

SetControl();

}

#endregion

#region 디폴트 장치 변경하기 - ChangeDefaultDevice(e)

/// <summary>

/// 디폴트 장치 변경하기

/// </summary>

/// <param name="e">이벤트 인자</param>

private void ChangeDefaultDevice(DefaultDeviceChangedArgs e)

{

if(((CoreAudioDevice)e.Device).IsDefaultDevice)

{

if(this.waveInEvent != null)

{

this.waveInEvent.StopRecording();

this.waveInEvent.DataAvailable -= waveInEvent_DataAvailable;

this.waveInEvent = null;

}

SetCoreAudioDeviceList();

SetControl();

}

#endregion

#region 장치 상태 변경하기 - ChangeDeviceState(e)

/// <summary>

/// 장치 상태 변경하기

/// </summary>

/// <param name="e">이벤트 인자</param>

private void ChangeDeviceState(DeviceStateChangedArgs e)

{

this.InvokeOnUIThreadIfRequired(() => this.volumeProgressBar.Value = 0);

if(((CoreAudioDevice)e.Device).IsDefaultDevice)

{

if(this.waveInEvent != null)

{

this.waveInEvent.StopRecording();

this.waveInEvent.DataAvailable -= waveInEvent_DataAvailable;

this.waveInEvent = null;

}

SetCoreAudioDeviceList();

SetControl();

}

#endregion

}

▶ MainWindow.xaml


<Window x:Class="TestProject.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:TestProject"
    Width="800"
    Height="600"
    Title="마이크로폰 볼륨 설정하기"
    FontFamily="나눔고딕코딩"
    FontSize="16">
    <Grid>
        <local:AudioControl />
    </Grid>
</Window>

<Window x:Class="TestProject.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:local="clr-namespace:TestProject"

Width="800"

Height="600"

Title="마이크로폰 볼륨 설정하기"

FontFamily="나눔고딕코딩"

FontSize="16">

<Grid>

<local:AudioControl />

</Grid>

</Window>

▶ MainWindow.xaml.cs


using System.Windows;

namespace TestProject
{
    /// <summary>
    /// 메인 윈도우
    /// </summary>
    public partial class MainWindow : Window
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainWindow()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainWindow()
        {
            InitializeComponent();
        }

        #endregion
    }
}

using System.Windows;

namespace TestProject

{

/// <summary>

/// 메인 윈도우

/// </summary>

public partial class MainWindow : Window

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - MainWindow()

/// <summary>

/// 생성자

/// </summary>

public MainWindow()

{

InitializeComponent();

}

#endregion

}

TestProject.zip

[C#/COMMON/NAUDIO] NAudio 누겟 설치하기

■ NAudio 누겟을 설치하는 방법을 보여준다. 1. Visual Studio를 실행한다. 2. [도구] / [NuGet 패키지 관리자] / [패키지 관리자 콘솔] 메뉴를 실행한다.

[C#/COMMON/NAUDIO/.NET5] Mp3FileReader 클래스 : 모노/스테레오 MP3 파일에서 PCM 데이터 구하기

■ Mp3FileReader 클래스를 사용해 모노/스테레오 MP3 파일에서 PCM 데이터를 구하는 방법을 보여준다. ▶ Program.cs


using System;

using NAudio.Wave;

namespace TestProject
{
    /// <summary>
    /// 프로그램
    /// </summary>
    class Program
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region 프로그램 시작하기 - Main()

        /// <summary>
        /// 프로그램 시작하기
        /// </summary>
        private static void Main()
        {
            using(Mp3FileReader reader = new Mp3FileReader("SOUND\\sample.mp3"))
            {
                Console.WriteLine($"샘플 비율             : {reader.WaveFormat.SampleRate}");
                Console.WriteLine($"채널 수               : {reader.WaveFormat.Channels}");
                Console.WriteLine($"샘플당 비트 수        : {reader.WaveFormat.BitsPerSample}");
                Console.WriteLine($"인코딩                : {reader.WaveFormat.Encoding}");
                Console.WriteLine($"블럭 정렬             : {reader.WaveFormat.BlockAlign}");
                Console.WriteLine($"초당 평균 바이트 수   : {reader.WaveFormat.AverageBytesPerSecond}");
                Console.WriteLine($"재생 시간 (단위 : 초) : {reader.Length / reader.WaveFormat.AverageBytesPerSecond}");

                if(reader.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
                {
                    return;
                }

                int bufferLength = (int)reader.Length;

                byte[] buffer = new byte[bufferLength];

                if(reader.WaveFormat.Channels == 1) // 모노 채널인 경우
                {
                    int readCount = reader.Read(buffer, 0, (int)bufferLength);

                    for(int i = 0; i < readCount; i += 2)
                    {
                        short sample = BitConverter.ToInt16(buffer, i);

                        Console.Write(sample);
                        Console.Write(" ");

                        if(i % 8 == 0)
                        {
                            Console.WriteLine();
                        }
                    }

                }
                else if(reader.WaveFormat.Channels == 2) // 스테레오 채널인 경우
                {
                    int readCount = reader.Read(buffer, 0, (int)bufferLength);

                    for(int i = 0; i < readCount; i += 4)
                    {
                        short leftSample  = BitConverter.ToInt16(buffer, i    );
                        short rightSample = BitConverter.ToInt16(buffer, i + 2);

                        Console.Write($"{leftSample}, {rightSample}");
                        Console.Write(" ");

                        if(i % 16 == 0)
                        {
                            Console.WriteLine();
                        }
                    }
                }
            }
        }

        #endregion
    }
}

using System;

using NAudio.Wave;

namespace TestProject

{

/// <summary>

/// 프로그램

/// </summary>

class Program

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Static

//////////////////////////////////////////////////////////////////////////////// Private

#region 프로그램 시작하기 - Main()

/// <summary>

/// 프로그램 시작하기

/// </summary>

private static void Main()

{

using(Mp3FileReader reader = new Mp3FileReader("SOUND\\sample.mp3"))

{

Console.WriteLine($"샘플 비율 : {reader.WaveFormat.SampleRate}");

Console.WriteLine($"채널 수 : {reader.WaveFormat.Channels}");

Console.WriteLine($"샘플당 비트 수 : {reader.WaveFormat.BitsPerSample}");

Console.WriteLine($"인코딩 : {reader.WaveFormat.Encoding}");

Console.WriteLine($"블럭 정렬 : {reader.WaveFormat.BlockAlign}");

Console.WriteLine($"초당 평균 바이트 수 : {reader.WaveFormat.AverageBytesPerSecond}");

Console.WriteLine($"재생 시간 (단위 : 초) : {reader.Length / reader.WaveFormat.AverageBytesPerSecond}");

if(reader.WaveFormat.Encoding != WaveFormatEncoding.Pcm)

{

return;

}

int bufferLength = (int)reader.Length;

byte[] buffer = new byte[bufferLength];

if(reader.WaveFormat.Channels == 1) // 모노 채널인 경우

{

int readCount = reader.Read(buffer, 0, (int)bufferLength);

for(int i = 0; i < readCount; i += 2)

{

short sample = BitConverter.ToInt16(buffer, i);

Console.Write(sample);

Console.Write(" ");

if(i % 8 == 0)

{

Console.WriteLine();

}

else if(reader.WaveFormat.Channels == 2) // 스테레오 채널인 경우

{

int readCount = reader.Read(buffer, 0, (int)bufferLength);

for(int i = 0; i < readCount; i += 4)

{

short leftSample = BitConverter.ToInt16(buffer, i );

short rightSample = BitConverter.ToInt16(buffer, i + 2);

Console.Write($"{leftSample}, {rightSample}");

Console.Write(" ");

if(i % 16 == 0)

{

Console.WriteLine();

}

#endregion

}

TestProject.zip

[C#/COMMON/NAUDIO/.NET5] MidiFile 클래스 : MIDI 파일 탐색하기

■ MidiFile 클래스를 사용해 MIDI 파일을 탐색하는 방법을 보여준다. ▶ Program.cs


using System;
using System.Linq;

using NAudio.Midi;

namespace TestProject
{
    /// <summary>
    /// 프로그램
    /// </summary>
    class Program
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Private

        #region MBT 문자열 구하기 - GetMBTString(eventTime, tickCountPerQuarterNote, timeSignatureEvent)

        /// <summary>
        /// MBT 문자열 구하기
        /// </summary>
        /// <param name="eventTime">이벤트 시간</param>
        /// <param name="tickCountPerQuarterNote">분기별 눈금 수</param>
        /// <param name="timeSignatureEvent">시간 서명 이벤트</param>
        /// <returns>MBT 문자열</returns>
        private static string GetMBTString(long eventTime, int tickCountPerQuarterNote, TimeSignatureEvent timeSignatureEvent)
        {
            int beatCountPerBar  = timeSignatureEvent == null ? 4 : timeSignatureEvent.Numerator;
            int tickCountPerBar  = timeSignatureEvent == null ? tickCountPerQuarterNote * 4 :
                                       (timeSignatureEvent.Numerator * tickCountPerQuarterNote * 4) / (1 << timeSignatureEvent.Denominator);
            int tickCountPerBeat = tickCountPerBar / beatCountPerBar;

            long bar  = 1 + (eventTime / tickCountPerBar);
            long beat = 1 + ((eventTime % tickCountPerBar) / tickCountPerBeat);
            long tick = eventTime % tickCountPerBeat;

            return $"{bar}:{beat}:{tick}";
        }

        #endregion
        #region 프로그램 시작하기 - Main()

        /// <summary>
        /// 프로그램 시작하기
        /// </summary>
        private static void Main()
        {
            string filePath = @"MIDI\sample.mid";

            MidiFile midiFile = new MidiFile(filePath, false);

            Console.WriteLine($"포맷 : {midiFile.FileFormat}, 트랙 수 : {midiFile.Tracks}, 분기별 델타 눈금 수 : {midiFile.DeltaTicksPerQuarterNote}");

            Console.WriteLine();

            for(int i = 0; i < midiFile.Tracks; i++)
            {
                TimeSignatureEvent timeSignatureEvent = midiFile.Events[i].OfType<TimeSignatureEvent>().FirstOrDefault();

                foreach(MidiEvent midiEvent in midiFile.Events[i])
                {
                    if(!MidiEvent.IsNoteOff(midiEvent))
                    {
                        string mbt = GetMBTString
                        (
                            midiEvent.AbsoluteTime,
                            midiFile.DeltaTicksPerQuarterNote,
                            timeSignatureEvent
                        );

                        Console.WriteLine("{0} {1}", mbt, midiEvent);
                    }
                }
            }
        }

        #endregion
    }
}

using System;

using System.Linq;

using NAudio.Midi;

namespace TestProject

{

/// <summary>

/// 프로그램

/// </summary>

class Program

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Static

//////////////////////////////////////////////////////////////////////////////// Private

#region MBT 문자열 구하기 - GetMBTString(eventTime, tickCountPerQuarterNote, timeSignatureEvent)

/// <summary>

/// MBT 문자열 구하기

/// </summary>

/// <param name="eventTime">이벤트 시간</param>

/// <param name="tickCountPerQuarterNote">분기별 눈금 수</param>

/// <param name="timeSignatureEvent">시간 서명 이벤트</param>

/// <returns>MBT 문자열</returns>

private static string GetMBTString(long eventTime, int tickCountPerQuarterNote, TimeSignatureEvent timeSignatureEvent)

{

int beatCountPerBar = timeSignatureEvent == null ? 4 : timeSignatureEvent.Numerator;

int tickCountPerBar = timeSignatureEvent == null ? tickCountPerQuarterNote * 4 :

(timeSignatureEvent.Numerator * tickCountPerQuarterNote * 4) / (1 << timeSignatureEvent.Denominator);

int tickCountPerBeat = tickCountPerBar / beatCountPerBar;

long bar = 1 + (eventTime / tickCountPerBar);

long beat = 1 + ((eventTime % tickCountPerBar) / tickCountPerBeat);

long tick = eventTime % tickCountPerBeat;

return $"{bar}:{beat}:{tick}";

}

#endregion

#region 프로그램 시작하기 - Main()

/// <summary>

/// 프로그램 시작하기

/// </summary>

private static void Main()

{

string filePath = @"MIDI\sample.mid";

MidiFile midiFile = new MidiFile(filePath, false);

Console.WriteLine($"포맷 : {midiFile.FileFormat}, 트랙 수 : {midiFile.Tracks}, 분기별 델타 눈금 수 : {midiFile.DeltaTicksPerQuarterNote}");

Console.WriteLine();

for(int i = 0; i < midiFile.Tracks; i++)

{

TimeSignatureEvent timeSignatureEvent = midiFile.Events[i].OfType<TimeSignatureEvent>().FirstOrDefault();

foreach(MidiEvent midiEvent in midiFile.Events[i])

{

if(!MidiEvent.IsNoteOff(midiEvent))

{

string mbt = GetMBTString

(

midiEvent.AbsoluteTime,

midiFile.DeltaTicksPerQuarterNote,

timeSignatureEvent

);

Console.WriteLine("{0} {1}", mbt, midiEvent);

}

#endregion

}

TestProject.zip

[C#/COMMON/NAUDIO/.NET5] MidiOut 클래스 : DeviceInfo 정적 메소드를 사용해 MIDI 출력 장치 열거하기

■ MidiOut 클래스의 DeviceInfo 정적 메소드를 사용해 MIDI 출력 장치를 열거하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Midi;

Console.WriteLine("MIDI OUT DEVICE");

for(int i = 0; i < MidiOut.NumberOfDevices; i++)
{
    MidiOutCapabilities midiOutCapabilities = MidiOut.DeviceInfo(i);

    Console.WriteLine($"    {midiOutCapabilities.ProductName}");
}

using System;

using NAudio.Midi;

Console.WriteLine("MIDI OUT DEVICE");

for(int i = 0; i < MidiOut.NumberOfDevices; i++)

{

MidiOutCapabilities midiOutCapabilities = MidiOut.DeviceInfo(i);

Console.WriteLine($" {midiOutCapabilities.ProductName}");

}

[C#/COMMON/NAUDIO/.NET5] MidiIn 클래스 : DeviceInfo 정적 메소드를 사용해 MIDI 입력 장치 열거하기

■ MidiIn 클래스의 DeviceInfo 정적 메소드를 사용해 MIDI 입력 장치를 열거하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Midi;

Console.WriteLine("MIDI IN DEVICE");

for(int i = 0; i < MidiIn.NumberOfDevices; i++)
{
    MidiInCapabilities midiInCapabilities = MidiIn.DeviceInfo(i);

    Console.WriteLine($"    {midiInCapabilities.ProductName}");
}

using System;

using NAudio.Midi;

Console.WriteLine("MIDI IN DEVICE");

for(int i = 0; i < MidiIn.NumberOfDevices; i++)

{

MidiInCapabilities midiInCapabilities = MidiIn.DeviceInfo(i);

Console.WriteLine($" {midiInCapabilities.ProductName}");

}

[C#/WINFORM/.NET5] WasapiLoopbackCapture 클래스 : 사운드 카드 출력을 WAV 파일로 레코딩하기

■ WasapiLoopbackCapture 클래스를 사용해 사운드 카드 출력을 WAV 파일로 레코딩하는 방법을 보여준다. ▶ MainForm.cs


using System;
using System.IO;
using System.Windows.Forms;

using NAudio.Wave;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 타겟 디렉토리 경로
        /// </summary>
        private string targetDirectoryPath;

        /// <summary>
        /// 타겟 파일 경로
        /// </summary>
        private string targerFilePath;

        /// <summary>
        /// WASAPI 루프백 캡처
        /// </summary>
        private WasapiLoopbackCapture wasapiLoopbackCapture;

        /// <summary>
        /// 웨이브 파일 작성자
        /// </summary>
        private WaveFileWriter waveFileWriter = null;

        /// <summary>
        /// 종료 여부
        /// </summary>
        private bool closing = false;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            this.targetDirectoryPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "NAudio");

            if(!Directory.Exists(this.targetDirectoryPath))
            {
                Directory.CreateDirectory(this.targetDirectoryPath);
            }

            this.targerFilePath = Path.Combine(this.targetDirectoryPath, "result.wav");

            this.wasapiLoopbackCapture = new WasapiLoopbackCapture();

            FormClosing                                 += Form_FormClosing;
            this.recordButton.Click                     += recordButton_Click;
            this.stopButton.Click                       += stopButton_Click;
            this.wasapiLoopbackCapture.DataAvailable    += wasapiLoopbackCapture_DataAvailable;
            this.wasapiLoopbackCapture.RecordingStopped += wasapiLoopbackCapture_RecordingStopped;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 폼을 닫을 경우 처리하기 - Form_FormClosing(sender, e)

        /// <summary>
        /// 폼을 닫을 경우 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Form_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.closing = true;

            this.wasapiLoopbackCapture.StopRecording();
        }

        #endregion
        #region 레코딩 버튼 클릭시 처리하기 - recordButton_Click(sender, e)

        /// <summary>
        /// 레코딩 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void recordButton_Click(object sender, EventArgs e)
        {
            this.waveFileWriter = new WaveFileWriter(this.targerFilePath, this.wasapiLoopbackCapture.WaveFormat);

            this.wasapiLoopbackCapture.StartRecording();

            this.recordButton.Enabled = false;
            this.stopButton.Enabled   = true;
        }

        #endregion
        #region 중단 버튼 클릭시 처리하기 - stopButton_Click(sender, e)

        /// <summary>
        /// 중단 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void stopButton_Click(object sender, EventArgs e)
        {
            this.wasapiLoopbackCapture.StopRecording();
        }

        #endregion
        #region WASAPI 루프백 캡처 데이터 이용 가능시 처리하기 - wasapiLoopbackCapture_DataAvailable(sender, e)

        /// <summary>
        /// WASAPI 루프백 캡처 데이터 이용 가능시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void wasapiLoopbackCapture_DataAvailable(object sender, WaveInEventArgs e)
        {
            this.waveFileWriter.Write(e.Buffer, 0, e.BytesRecorded);

            if(this.waveFileWriter.Position > this.wasapiLoopbackCapture.WaveFormat.AverageBytesPerSecond * 30)
            {
                this.wasapiLoopbackCapture.StopRecording();
            }
        }

        #endregion
        #region WASAPI 루프백 캡처 레코딩 중단시 처리하기 - wasapiLoopbackCapture_RecordingStopped(sender, e)

        /// <summary>
        /// WASAPI 루프백 캡처 레코딩 중단시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void wasapiLoopbackCapture_RecordingStopped(object sender, StoppedEventArgs e)
        {
            this.waveFileWriter?.Dispose();

            this.waveFileWriter = null;

            this.recordButton.Enabled = true;
            this.stopButton.Enabled   = false;

            if(this.closing)
            {
                this.wasapiLoopbackCapture.Dispose();
            }
        }

        #endregion
    }
}

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using System;

using System.IO;

using System.Windows.Forms;

using NAudio.Wave;

namespace TestProject

{

/// <summary>

/// 메인 폼

/// </summary>

public partial class MainForm : Form

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 타겟 디렉토리 경로

/// </summary>

private string targetDirectoryPath;

/// <summary>

/// 타겟 파일 경로

/// </summary>

private string targerFilePath;

/// <summary>

/// WASAPI 루프백 캡처

/// </summary>

private WasapiLoopbackCapture wasapiLoopbackCapture;

/// <summary>

/// 웨이브 파일 작성자

/// </summary>

private WaveFileWriter waveFileWriter = null;

/// <summary>

/// 종료 여부

/// </summary>

private bool closing = false;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - MainForm()

/// <summary>

/// 생성자

/// </summary>

public MainForm()

{

InitializeComponent();

this.targetDirectoryPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "NAudio");

if(!Directory.Exists(this.targetDirectoryPath))

{

Directory.CreateDirectory(this.targetDirectoryPath);

}

this.targerFilePath = Path.Combine(this.targetDirectoryPath, "result.wav");

this.wasapiLoopbackCapture = new WasapiLoopbackCapture();

FormClosing += Form_FormClosing;

this.recordButton.Click += recordButton_Click;

this.stopButton.Click += stopButton_Click;

this.wasapiLoopbackCapture.DataAvailable += wasapiLoopbackCapture_DataAvailable;

this.wasapiLoopbackCapture.RecordingStopped += wasapiLoopbackCapture_RecordingStopped;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Private

//////////////////////////////////////////////////////////////////////////////// Event

#region 폼을 닫을 경우 처리하기 - Form_FormClosing(sender, e)

/// <summary>

/// 폼을 닫을 경우 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void Form_FormClosing(object sender, FormClosingEventArgs e)

{

this.closing = true;

this.wasapiLoopbackCapture.StopRecording();

}

#endregion

#region 레코딩 버튼 클릭시 처리하기 - recordButton_Click(sender, e)

/// <summary>

/// 레코딩 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void recordButton_Click(object sender, EventArgs e)

{

this.waveFileWriter = new WaveFileWriter(this.targerFilePath, this.wasapiLoopbackCapture.WaveFormat);

this.wasapiLoopbackCapture.StartRecording();

this.recordButton.Enabled = false;

this.stopButton.Enabled = true;

}

#endregion

#region 중단 버튼 클릭시 처리하기 - stopButton_Click(sender, e)

/// <summary>

/// 중단 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void stopButton_Click(object sender, EventArgs e)

{

this.wasapiLoopbackCapture.StopRecording();

}

#endregion

#region WASAPI 루프백 캡처 데이터 이용 가능시 처리하기 - wasapiLoopbackCapture_DataAvailable(sender, e)

/// <summary>

/// WASAPI 루프백 캡처 데이터 이용 가능시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void wasapiLoopbackCapture_DataAvailable(object sender, WaveInEventArgs e)

{

this.waveFileWriter.Write(e.Buffer, 0, e.BytesRecorded);

if(this.waveFileWriter.Position > this.wasapiLoopbackCapture.WaveFormat.AverageBytesPerSecond * 30)

{

this.wasapiLoopbackCapture.StopRecording();

}

#endregion

#region WASAPI 루프백 캡처 레코딩 중단시 처리하기 - wasapiLoopbackCapture_RecordingStopped(sender, e)

/// <summary>

/// WASAPI 루프백 캡처 레코딩 중단시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void wasapiLoopbackCapture_RecordingStopped(object sender, StoppedEventArgs e)

{

this.waveFileWriter?.Dispose();

this.waveFileWriter = null;

this.recordButton.Enabled = true;

this.stopButton.Enabled = false;

if(this.closing)

{

this.wasapiLoopbackCapture.Dispose();

}

#endregion

}

※ Windows는 기록할 특정 프로그램의 출력을 대상으로

[C#/WINFORM/.NET5] WaveInEvent 클래스 : WAV 파일 레코딩하기

■ WaveInEvent 클래스를 사용해 WAV 파일을 레코딩하는 방법을 보여준다. ▶ MainForm.cs


using System;
using System.IO;
using System.Windows.Forms;

using NAudio.Wave;

namespace TestProject
{
    /// <summary>
    /// 메인 폼
    /// </summary>
    public partial class MainForm : Form
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 타겟 디렉토리 경로
        /// </summary>
        private string targetDirectoryPath;

        /// <summary>
        /// 타겟 파일 경로
        /// </summary>
        private string targerFilePath;

        /// <summary>
        /// 웨이브 입력 이벤트
        /// </summary>
        private WaveInEvent waveInEvent;

        /// <summary>
        /// 웨이브 파일 작성자
        /// </summary>
        private WaveFileWriter waveFileWriter = null;

        /// <summary>
        /// 종료 여부
        /// </summary>
        private bool closing = false;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - MainForm()

        /// <summary>
        /// 생성자
        /// </summary>
        public MainForm()
        {
            InitializeComponent();

            this.targetDirectoryPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "NAudio");

            if(!Directory.Exists(this.targetDirectoryPath))
            {
                Directory.CreateDirectory(this.targetDirectoryPath);
            }

            this.targerFilePath = Path.Combine(this.targetDirectoryPath, "result.wav");

            this.waveInEvent = new WaveInEvent();

            FormClosing                       += Form_FormClosing;
            this.recordButton.Click           += recordButton_Click;
            this.stopButton.Click             += stopButton_Click;
            this.waveInEvent.DataAvailable    += waveInEvent_DataAvailable;
            this.waveInEvent.RecordingStopped += waveInEvent_RecordingStopped;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Private
        //////////////////////////////////////////////////////////////////////////////// Event

        #region 폼을 닫을 경우 처리하기 - Form_FormClosing(sender, e)

        /// <summary>
        /// 폼을 닫을 경우 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void Form_FormClosing(object sender, FormClosingEventArgs e)
        {
            this.closing = true;

            this.waveInEvent.StopRecording();
        }

        #endregion
        #region 레코딩 버튼 클릭시 처리하기 - recordButton_Click(sender, e)

        /// <summary>
        /// 레코딩 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void recordButton_Click(object sender, EventArgs e)
        {
            this.waveFileWriter = new WaveFileWriter(this.targerFilePath, this.waveInEvent.WaveFormat);

            this.waveInEvent.StartRecording();

            this.recordButton.Enabled = false;
            this.stopButton.Enabled   = true;
        }

        #endregion
        #region 중단 버튼 클릭시 처리하기 - stopButton_Click(sender, e)

        /// <summary>
        /// 중단 버튼 클릭시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void stopButton_Click(object sender, EventArgs e)
        {
            this.waveInEvent.StopRecording();
        }

        #endregion
        #region 웨이브 입력 이벤트 데이터 이용 가능시 처리하기 - waveInEvent_DataAvailable(sender, e)

        /// <summary>
        /// 웨이브 입력 이벤트 데이터 이용 가능시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void waveInEvent_DataAvailable(object sender, WaveInEventArgs e)
        {
            this.waveFileWriter.Write(e.Buffer, 0, e.BytesRecorded);

            if(this.waveFileWriter.Position > this.waveInEvent.WaveFormat.AverageBytesPerSecond * 30)
            {
                this.waveInEvent.StopRecording();
            }
        }

        #endregion
        #region 웨이브 입력 이벤트 레코딩 중단시 처리하기 - waveInEvent_RecordingStopped(sender, e)

        /// <summary>
        /// 웨이브 입력 이벤트 레코딩 중단시 처리하기
        /// </summary>
        /// <param name="sender">이벤트 발생자</param>
        /// <param name="e">이벤트 인자</param>
        private void waveInEvent_RecordingStopped(object sender, StoppedEventArgs e)
        {
            this.waveFileWriter?.Dispose();

            this.waveFileWriter = null;

            this.recordButton.Enabled = true;
            this.stopButton.Enabled   = false;

            if(this.closing)
            {
                this.waveInEvent.Dispose();
            }
        }

        #endregion
    }
}

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using System;

using System.IO;

using System.Windows.Forms;

using NAudio.Wave;

namespace TestProject

{

/// <summary>

/// 메인 폼

/// </summary>

public partial class MainForm : Form

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 타겟 디렉토리 경로

/// </summary>

private string targetDirectoryPath;

/// <summary>

/// 타겟 파일 경로

/// </summary>

private string targerFilePath;

/// <summary>

/// 웨이브 입력 이벤트

/// </summary>

private WaveInEvent waveInEvent;

/// <summary>

/// 웨이브 파일 작성자

/// </summary>

private WaveFileWriter waveFileWriter = null;

/// <summary>

/// 종료 여부

/// </summary>

private bool closing = false;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - MainForm()

/// <summary>

/// 생성자

/// </summary>

public MainForm()

{

InitializeComponent();

this.targetDirectoryPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "NAudio");

if(!Directory.Exists(this.targetDirectoryPath))

{

Directory.CreateDirectory(this.targetDirectoryPath);

}

this.targerFilePath = Path.Combine(this.targetDirectoryPath, "result.wav");

this.waveInEvent = new WaveInEvent();

FormClosing += Form_FormClosing;

this.recordButton.Click += recordButton_Click;

this.stopButton.Click += stopButton_Click;

this.waveInEvent.DataAvailable += waveInEvent_DataAvailable;

this.waveInEvent.RecordingStopped += waveInEvent_RecordingStopped;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Private

//////////////////////////////////////////////////////////////////////////////// Event

#region 폼을 닫을 경우 처리하기 - Form_FormClosing(sender, e)

/// <summary>

/// 폼을 닫을 경우 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void Form_FormClosing(object sender, FormClosingEventArgs e)

{

this.closing = true;

this.waveInEvent.StopRecording();

}

#endregion

#region 레코딩 버튼 클릭시 처리하기 - recordButton_Click(sender, e)

/// <summary>

/// 레코딩 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void recordButton_Click(object sender, EventArgs e)

{

this.waveFileWriter = new WaveFileWriter(this.targerFilePath, this.waveInEvent.WaveFormat);

this.waveInEvent.StartRecording();

this.recordButton.Enabled = false;

this.stopButton.Enabled = true;

}

#endregion

#region 중단 버튼 클릭시 처리하기 - stopButton_Click(sender, e)

/// <summary>

/// 중단 버튼 클릭시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void stopButton_Click(object sender, EventArgs e)

{

this.waveInEvent.StopRecording();

}

#endregion

#region 웨이브 입력 이벤트 데이터 이용 가능시 처리하기 - waveInEvent_DataAvailable(sender, e)

/// <summary>

/// 웨이브 입력 이벤트 데이터 이용 가능시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void waveInEvent_DataAvailable(object sender, WaveInEventArgs e)

{

this.waveFileWriter.Write(e.Buffer, 0, e.BytesRecorded);

if(this.waveFileWriter.Position > this.waveInEvent.WaveFormat.AverageBytesPerSecond * 30)

{

this.waveInEvent.StopRecording();

}

#endregion

#region 웨이브 입력 이벤트 레코딩 중단시 처리하기 - waveInEvent_RecordingStopped(sender, e)

/// <summary>

/// 웨이브 입력 이벤트 레코딩 중단시 처리하기

/// </summary>

/// <param name="sender">이벤트 발생자</param>

/// <param name="e">이벤트 인자</param>

private void waveInEvent_RecordingStopped(object sender, StoppedEventArgs e)

{

this.waveFileWriter?.Dispose();

this.waveFileWriter = null;

this.recordButton.Enabled = true;

this.stopButton.Enabled = false;

if(this.closing)

{

this.waveInEvent.Dispose();

}

#endregion

}

TestProject.zip

[C#/COMMON/NAUDIO/.NET5] SignalGenerator 클래스 사용하기

■ SignalGenerator 클래스를 사용하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;
using System.Threading;

using NAudio.Wave;
using NAudio.Wave.SampleProviders;

ISampleProvider provider = new SignalGenerator()
{
    Gain      = 0.2,
    Frequency = 500,
    Type      = SignalGeneratorType.Sin
}.Take(TimeSpan.FromSeconds(5));

using(WaveOutEvent waveOutEvent = new WaveOutEvent())
{
    waveOutEvent.Init(provider);

    waveOutEvent.Play();

    while(waveOutEvent.PlaybackState == PlaybackState.Playing)
    {
        Thread.Sleep(500);
    }
}

using System;

using System.Threading;

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

ISampleProvider provider = new SignalGenerator()

{

Gain = 0.2,

Frequency = 500,

Type = SignalGeneratorType.Sin

}.Take(TimeSpan.FromSeconds(5));

using(WaveOutEvent waveOutEvent = new WaveOutEvent())

{

waveOutEvent.Init(provider);

waveOutEvent.Play();

while(waveOutEvent.PlaybackState == PlaybackState.Playing)

{

Thread.Sleep(500);

}

[C#/COMMON/NAUDIO/.NET5] SmbPitchShiftingSampleProvider 클래스 : PitchFactor 속성을 사용해 피치 변조하기

■ SmbPitchShiftingSampleProvider 클래스의 PitchFactor 속성을 사용해 피치를 변조하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;
using System.Threading;

using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"D:\source.mp3";
double semitone            = Math.Pow(2, 1.0 / 12);
double upOneTone           = semitone * semitone;
double downOneTone         = 1.0 / upOneTone;

using(MediaFoundationReader reader = new MediaFoundationReader(sourceAudioFilePath))
{
    SmbPitchShiftingSampleProvider provider = new SmbPitchShiftingSampleProvider(reader.ToSampleProvider());

    provider.PitchFactor = (float)upOneTone;

    using(WaveOutEvent waveOutEvent = new WaveOutEvent())
    {
        waveOutEvent.Init(provider.Take(TimeSpan.FromSeconds(10)));

        waveOutEvent.Play();

        while(waveOutEvent.PlaybackState == PlaybackState.Playing)
        {
            Thread.Sleep(500);
        }
    }
}

using System;

using System.Threading;

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"D:\source.mp3";

double semitone = Math.Pow(2, 1.0 / 12);

double upOneTone = semitone * semitone;

double downOneTone = 1.0 / upOneTone;

using(MediaFoundationReader reader = new MediaFoundationReader(sourceAudioFilePath))

{

SmbPitchShiftingSampleProvider provider = new SmbPitchShiftingSampleProvider(reader.ToSampleProvider());

provider.PitchFactor = (float)upOneTone;

using(WaveOutEvent waveOutEvent = new WaveOutEvent())

{

waveOutEvent.Init(provider.Take(TimeSpan.FromSeconds(10)));

waveOutEvent.Play();

while(waveOutEvent.PlaybackState == PlaybackState.Playing)

{

Thread.Sleep(500);

}

[C#/COMMON/NAUDIO/.NET5] WaveFormat 클래스 : CreateALawFormat 정적 메소드를 사용해 G.711 a-law 같은 포맷 사용하기

■ WaveFormat 클래스의 CreateALawFormat 정적 메소드를 사용해 G.711 a-law 같은 포맷을 사용하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System.IO;

using NAudio.Wave;

string sourceAudioFilePath = @"D:\source.bin";
string targetAudioFilePath = @"D:\target.wav";

WaveFormat sourceWaveFormet = WaveFormat.CreateALawFormat(8000,1);

using(FileStream sourceFileStream = File.OpenRead(sourceAudioFilePath))
{
    using(RawSourceWaveStream reader = new RawSourceWaveStream(sourceFileStream, sourceWaveFormet))
    {
        using(WaveStream provider = WaveFormatConversionStream.CreatePcmStream(reader))
        {
            WaveFileWriter.CreateWaveFile(targetAudioFilePath, provider);
        }
    }
}

using System.IO;

using NAudio.Wave;

string sourceAudioFilePath = @"D:\source.bin";

string targetAudioFilePath = @"D:\target.wav";

WaveFormat sourceWaveFormet = WaveFormat.CreateALawFormat(8000,1);

using(FileStream sourceFileStream = File.OpenRead(sourceAudioFilePath))

{

using(RawSourceWaveStream reader = new RawSourceWaveStream(sourceFileStream, sourceWaveFormet))

{

using(WaveStream provider = WaveFormatConversionStream.CreatePcmStream(reader))

{

WaveFileWriter.CreateWaveFile(targetAudioFilePath, provider);

}

[C#/COMMON/NAUDIO/.NET5] WaveFormat 클래스 : CreateCustomFormat 정적 메소드를 사용해 커스텀 포맷 만들기

■ WaveFormat 클래스의 CreateCustomFormat 정적 메소드를 사용해 커스텀 포맷을 만드는 방법을 보여준다. ▶ 예제 코드 (C#)


using System.IO;

using NAudio.Wave;

string sourceAudioFilePath = @"D:\source.g729";
string targetAudioFilePath = @"D:\target.wav";

WaveFormat sourceWaveFormat = WaveFormat.CreateCustomFormat
(
    WaveFormatEncoding.G729,
    8000, // 샘플링 비율
    1,    // 채널 수
    1000, // 초당 평균 바이트 수
    10,   // 블럭 정렬
    1     // 샘플당 비트 수
);

using(FileStream sourceStream = File.OpenRead(sourceAudioFilePath))
{
    using(RawSourceWaveStream reader = new RawSourceWaveStream(sourceStream, sourceWaveFormat))
    {
        using(WaveStream provider = WaveFormatConversionStream.CreatePcmStream(reader))
        {
            WaveFileWriter.CreateWaveFile(targetAudioFilePath, provider);
        }
    }
}

using System.IO;

using NAudio.Wave;

string sourceAudioFilePath = @"D:\source.g729";

string targetAudioFilePath = @"D:\target.wav";

WaveFormat sourceWaveFormat = WaveFormat.CreateCustomFormat

(

WaveFormatEncoding.G729,

8000, // 샘플링 비율

1, // 채널 수

1000, // 초당 평균 바이트 수

10, // 블럭 정렬

1 // 샘플당 비트 수

);

using(FileStream sourceStream = File.OpenRead(sourceAudioFilePath))

{

using(RawSourceWaveStream reader = new RawSourceWaveStream(sourceStream, sourceWaveFormat))

{

using(WaveStream provider = WaveFormatConversionStream.CreatePcmStream(reader))

{

WaveFileWriter.CreateWaveFile(targetAudioFilePath, provider);

}

[C#/COMMON/NAUDIO/.NET5] RawSourceWaveStream 클래스 사용하기

■ RawSourceWaveStream 클래스를 사용하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;
using System.IO;
using System.Threading;

using NAudio.Wave;

int    sampleRate  = 16000;
int    frequency   = 500;
double amplitude   = 0.2;
int    secondCount = 5;

byte[] bufferByteArray = new byte[sampleRate * secondCount * 2];

double multiple = 2.0 * frequency / sampleRate;

for(int i = 0; i < sampleRate * secondCount; i++)
{
    double sampleSaw         = ((i * multiple) % 2) - 1;
    double sampleValueDouble = sampleSaw > 0 ? amplitude : -amplitude;
    short  sampleValueShort  = (short)(sampleValueDouble * short.MaxValue);

    byte[] sampleValueByteArray = BitConverter.GetBytes(sampleValueShort);

    bufferByteArray[i * 2    ] = sampleValueByteArray[0];
    bufferByteArray[i * 2 + 1] = sampleValueByteArray[1];
}

MemoryStream memoryStream = new MemoryStream(bufferByteArray);

RawSourceWaveStream rawSourceWaveStream = new RawSourceWaveStream
(
    memoryStream,
    new WaveFormat(sampleRate, 16, 1)
);

WaveOutEvent waveOutEvent = new WaveOutEvent();

waveOutEvent.Init(rawSourceWaveStream);

waveOutEvent.Play();

while(waveOutEvent.PlaybackState == PlaybackState.Playing)
{
    Thread.Sleep(500);
}

waveOutEvent.Dispose();

using System;

using System.IO;

using System.Threading;

using NAudio.Wave;

int sampleRate = 16000;

int frequency = 500;

double amplitude = 0.2;

int secondCount = 5;

byte[] bufferByteArray = new byte[sampleRate * secondCount * 2];

double multiple = 2.0 * frequency / sampleRate;

for(int i = 0; i < sampleRate * secondCount; i++)

{

double sampleSaw = ((i * multiple) % 2) - 1;

double sampleValueDouble = sampleSaw > 0 ? amplitude : -amplitude;

short sampleValueShort = (short)(sampleValueDouble * short.MaxValue);

byte[] sampleValueByteArray = BitConverter.GetBytes(sampleValueShort);

bufferByteArray[i * 2 ] = sampleValueByteArray[0];

bufferByteArray[i * 2 + 1] = sampleValueByteArray[1];

}

MemoryStream memoryStream = new MemoryStream(bufferByteArray);

RawSourceWaveStream rawSourceWaveStream = new RawSourceWaveStream

(

memoryStream,

new WaveFormat(sampleRate, 16, 1)

);

WaveOutEvent waveOutEvent = new WaveOutEvent();

waveOutEvent.Init(rawSourceWaveStream);

waveOutEvent.Play();

while(waveOutEvent.PlaybackState == PlaybackState.Playing)

{

Thread.Sleep(500);

}

waveOutEvent.Dispose();

[C#/COMMON/NAUDIO/.NET5] 건너뛰기(SkipOver) 최적화하기

■ 건너뛰기(SkipOver)를 최적화하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Wave;

string sourceAudioFilePath = @"d:\source.mp3";
string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader = new AudioFileReader(sourceAudioFilePath);

reader.CurrentTime = TimeSpan.FromSeconds(30);

ISampleProvider provider = reader.Take(TimeSpan.FromSeconds(60));

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using System;

using NAudio.Wave;

string sourceAudioFilePath = @"d:\source.mp3";

string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader = new AudioFileReader(sourceAudioFilePath);

reader.CurrentTime = TimeSpan.FromSeconds(30);

ISampleProvider provider = reader.Take(TimeSpan.FromSeconds(60));

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] WaveExtensionMethods 클래스 : Skip/Take 확장 메소드를 사용해 오디오 파일 잘라내기

■ WaveExtensionMethods 클래스의 Skip/Take 확장 메소드를 사용해 오디오 파일을 잘라내는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Wave;

string sourceAudioFilePath = @"d:\source.mp3";
string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader = new AudioFileReader(sourceAudioFilePath);

ISampleProvider provider = reader.Skip(TimeSpan.FromSeconds(30))
                                 .Take(TimeSpan.FromSeconds(60));

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using System;

using NAudio.Wave;

string sourceAudioFilePath = @"d:\source.mp3";

string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader = new AudioFileReader(sourceAudioFilePath);

ISampleProvider provider = reader.Skip(TimeSpan.FromSeconds(30))

.Take(TimeSpan.FromSeconds(60));

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] OffsetSampleProvider 클래스 : SkipOver/Take 속성을 사용해 오디오 파일 잘라내기

■ OffsetSampleProvider 클래스의 SkipOver/Take 속성을 사용해 오디오 파일을 잘라내는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Wave;
using NAudio.Wave.SampleProviders;


string sourceAudioFilePath = @"d:\source.mp3";
string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader = new AudioFileReader(sourceAudioFilePath);

OffsetSampleProvider provider = new OffsetSampleProvider(reader)
{
    SkipOver = TimeSpan.FromSeconds(30), // 30초 건너뛰기
    Take     = TimeSpan.FromSeconds(60)  // 60초 재생
};

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using System;

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3";

string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader = new AudioFileReader(sourceAudioFilePath);

OffsetSampleProvider provider = new OffsetSampleProvider(reader)

{

SkipOver = TimeSpan.FromSeconds(30), // 30초 건너뛰기

Take = TimeSpan.FromSeconds(60) // 60초 재생

};

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] OffsetSampleProvider 클래스 : DelayBy/Take/LeadOut 속성을 사용해 오디오 파일 잘라내기

■ OffsetSampleProvider 클래스의 DelayBy/Take/LeadOut 속성을 사용해 오디오 파일을 잘라내는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string targetAudioFilePath = @"d:\target.wav";

SignalGenerator generator = new SignalGenerator()
{
    Gain      = 0.2,
    Frequency = 500,
    Type      = SignalGeneratorType.Sin
};

OffsetSampleProvider provider = new OffsetSampleProvider(generator)
{
    DelayBy = TimeSpan.FromSeconds(1), // 전위 1초 침묵 추가
    Take    = TimeSpan.FromSeconds(5), // 5초 재생
    LeadOut = TimeSpan.FromSeconds(1)  // 후위 1초 침묵 추가
};

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using System;

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string targetAudioFilePath = @"d:\target.wav";

SignalGenerator generator = new SignalGenerator()

{

Gain = 0.2,

Frequency = 500,

Type = SignalGeneratorType.Sin

};

OffsetSampleProvider provider = new OffsetSampleProvider(generator)

{

DelayBy = TimeSpan.FromSeconds(1), // 전위 1초 침묵 추가

Take = TimeSpan.FromSeconds(5), // 5초 재생

LeadOut = TimeSpan.FromSeconds(1) // 후위 1초 침묵 추가

};

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] WaveExtensionMethods 클래스 : FollowedBy 확장 메소드를 사용해 오디오 파일 연결하기

■ WaveExtensionMethods 클래스의 FollowedBy 확장 메소드를 사용해 오디오 파일을 연결하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Wave;

string sourceAudioFilePath1 = @"d:\source1.mp3";
string sourceAudioFilePath2 = @"d:\source2.mp3";
string targetAudioFilePath  = @"d:\target.wav";

AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1);
AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2);

ISampleProvider provider = reader1.FollowedBy(TimeSpan.FromSeconds(1), reader2);

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using System;

using NAudio.Wave;

string sourceAudioFilePath1 = @"d:\source1.mp3";

string sourceAudioFilePath2 = @"d:\source2.mp3";

string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1);

AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2);

ISampleProvider provider = reader1.FollowedBy(TimeSpan.FromSeconds(1), reader2);

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] ConcatenatingSampleProvider 클래스 : 오디오 파일 연결하기

■ ConcatenatingSampleProvider 클래스를 사용해 오디오 파일을 연결하는 방법을 보여준다. ▶ 예제 코드 (C#)


using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string sourceAudioFilePath1 = @"d:\source1.mp3";
string sourceAudioFilePath2 = @"d:\source2.mp3";
string sourceAudioFilePath3 = @"d:\source3.mp3";
string targetAudioFilePath  = @"d:\target.wav";

AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1);
AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2);
AudioFileReader reader3 = new AudioFileReader(sourceAudioFilePath3);

ConcatenatingSampleProvider provider = new ConcatenatingSampleProvider(new[] { reader1, reader2, reader3 });

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath1 = @"d:\source1.mp3";

string sourceAudioFilePath2 = @"d:\source2.mp3";

string sourceAudioFilePath3 = @"d:\source3.mp3";

string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1);

AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2);

AudioFileReader reader3 = new AudioFileReader(sourceAudioFilePath3);

ConcatenatingSampleProvider provider = new ConcatenatingSampleProvider(new[] { reader1, reader2, reader3 });

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] WaveExtensionMethods 클래스 : FollowedBy 확장 메소드를 사용해 오디오 파일 연결하기

■ WaveExtensionMethods 클래스의 FollowedBy 확장 메소드를 사용해 오디오 파일을 연결하는 방법을 보여준다. ▶ 예제 코드 (C#)


using NAudio.Wave;

string sourceAudioFilePath1 = @"d:\source1.mp3";
string sourceAudioFilePath2 = @"d:\source2.mp3";
string targetAudioFilePath  = @"d:\target.wav";

AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1);
AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2);

ISampleProvider provider = reader1.FollowedBy(reader2);

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

using NAudio.Wave;

string sourceAudioFilePath1 = @"d:\source1.mp3";

string sourceAudioFilePath2 = @"d:\source2.mp3";

string targetAudioFilePath = @"d:\target.wav";

AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1);

AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2);

ISampleProvider provider = reader1.FollowedBy(reader2);

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

[C#/COMMON/NAUDIO/.NET5] PanningSampleProvider 클래스 : 모노 파일을 스테레오 파일로 변환하기

■ PanningSampleProvider 클래스를 사용해 모노 파일을 스테레오 파일로 변환하는 방법을 보여준다. ▶ 예제 코드 (C#)


using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3"; // 모노
string targetAudioFilePath = @"d:\target.wav"; // 스테레오

using(var reader = new AudioFileReader(sourceAudioFilePath))
{
    PanningSampleProvider provider = new PanningSampleProvider(reader);

    provider.PanStrategy = new SquareRootPanStrategy();
    provider.Pan         = -0.5f;

    WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);
}

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3"; // 모노

string targetAudioFilePath = @"d:\target.wav"; // 스테레오

using(var reader = new AudioFileReader(sourceAudioFilePath))

{

PanningSampleProvider provider = new PanningSampleProvider(reader);

provider.PanStrategy = new SquareRootPanStrategy();

provider.Pan = -0.5f;

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

}

※ PanningSampleProvider 클래스는 사용자 지정 가능한

[C#/COMMON/NAUDIO/.NET5] MonoToStereoSampleProvider 클래스 : 모노 파일을 스테레오 파일로 변환하기

■ MonoToStereoSampleProvider 클래스를 사용해 모노 파일을 스테레오 파일로 변환하는 방법을 보여준다. ▶ 예제 코드 (C#)


using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3"; // 모노
string targetAudioFilePath = @"d:\target.wav"; // 스테레오

using(AudioFileReader reader = new AudioFileReader(sourceAudioFilePath))
{
    MonoToStereoSampleProvider provider = new MonoToStereoSampleProvider(reader);

    provider.LeftVolume  = 0.0f;
    provider.RightVolume = 1.0f;

    WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);
}

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3"; // 모노

string targetAudioFilePath = @"d:\target.wav"; // 스테레오

using(AudioFileReader reader = new AudioFileReader(sourceAudioFilePath))

{

MonoToStereoSampleProvider provider = new MonoToStereoSampleProvider(reader);

provider.LeftVolume = 0.0f;

provider.RightVolume = 1.0f;

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

}

※ MonoToStereoProvider16 클래스는 16비트 PCM 스테레오

[C#/COMMON/NAUDIO/.NET5] StereoToMonoSampleProvider 클래스 : 스테레오 파일을 모노 파일로 변환하기

■ StereoToMonoSampleProvider 클래스를 사용해 스테레오 파일을 모노 파일로 변환하는 방법을 보여준다. ▶ 예제 코드 (C#)


using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3"; // 스테레오
string targetAudioFilePath = @"d:\target.wav"; // 모노

using(AudioFileReader reader = new AudioFileReader(sourceAudioFilePath))
{
    StereoToMonoSampleProvider provider = new StereoToMonoSampleProvider(reader);

    provider.LeftVolume  = 0.0f;
    provider.RightVolume = 1.0f;

    WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);
}

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath = @"d:\source.mp3"; // 스테레오

string targetAudioFilePath = @"d:\target.wav"; // 모노

using(AudioFileReader reader = new AudioFileReader(sourceAudioFilePath))

{

StereoToMonoSampleProvider provider = new StereoToMonoSampleProvider(reader);

provider.LeftVolume = 0.0f;

provider.RightVolume = 1.0f;

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

}

※ StereoToMonoProvider16 클래스는 16비트 PCM 스테레오

[C#/COMMON/NAUDIO/.NET5] MixingSampleProvider 클래스 : 2개의 WAV 파일을 1개의 WAV 파일로 변환하기

■ MixingSampleProvider 클래스를 사용해 2개의 WAV 파일을 1개의 WAV 파일로 변환하는 방법을 보여준다. ▶ 예제 코드 (C#)


using System;

using NAudio.Wave;
using NAudio.Wave.SampleProviders;

string sourceAudioFilePath1 = @"d:\source1.wav";
string sourceAudioFilePath2 = @"d:\source2.wav";
string targetAudioFilePath  = @"d:\target.wav";

using(AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1))
{
    using(AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2))
    {
        reader1.Volume = 0.75f;
        reader2.Volume = 0.75f;

        MixingSampleProvider provider = new MixingSampleProvider
        (
            new[]
            {
                reader1.Take(TimeSpan.FromSeconds(5)),
                reader2.Skip(TimeSpan.FromSeconds(3)).Take(TimeSpan.FromSeconds(5))
            }
        );

        WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);
    }
}

using System;

using NAudio.Wave;

using NAudio.Wave.SampleProviders;

string sourceAudioFilePath1 = @"d:\source1.wav";

string sourceAudioFilePath2 = @"d:\source2.wav";

string targetAudioFilePath = @"d:\target.wav";

using(AudioFileReader reader1 = new AudioFileReader(sourceAudioFilePath1))

{

using(AudioFileReader reader2 = new AudioFileReader(sourceAudioFilePath2))

{

reader1.Volume = 0.75f;

reader2.Volume = 0.75f;

MixingSampleProvider provider = new MixingSampleProvider

(

new[]

{

reader1.Take(TimeSpan.FromSeconds(5)),

reader2.Skip(TimeSpan.FromSeconds(3)).Take(TimeSpan.FromSeconds(5))

}

);

WaveFileWriter.CreateWaveFile16(targetAudioFilePath, provider);

}