在特定设备中播放声音

Question

我是Csharp的初学者，我试图使用NAudio进行开发。我在NAudio网站中找到了一个代码，该代码使我可以播放声音。 在我的情况下，我将创建三个按钮，每个按钮都与外部声卡相关，当我单击按钮时，我想要听到与我的声卡相关的扬声器的声音（按钮1与声卡1有关，...）。因此，每个功能“回放”应该在特定设备中播放声音。对于性能问题，为每个按钮创建一个“播放”功能并不是很简单（对每个声卡都是如此），而我的声音可以让我只在声卡中播放声音，请你能帮我修改代码吗？这对我来说非常重要。

using System; 
using System.Collections.Generic; 
using System.Windows.Forms; 
using NAudio.Wave; 
using NAudio.CoreAudioApi; 
namespace PaGa 
{ 
public partial class PlaybackForm : Form 
{ 
    IWavePlayer waveOut; 
    string fileName = null; 
    WaveStream mainOutputStream; 
    WaveChannel32 volumeStream; 
    public PlaybackForm() 
    { 
     InitializeComponent(); 
    } 
    private void buttonPlay_Click(object sender, EventArgs e) 
    { 
     if (waveOut != null) 
     { 
      if (waveOut.PlaybackState == PlaybackState.Playing) 
      { 
       return; 
      } 
      else if (waveOut.PlaybackState == PlaybackState.Paused) 
      { 
       waveOut.Play(); 
       return; 
      } 
     } 
     // we are in a stopped state 
     // TODO: only re-initialise if necessary 
     if (String.IsNullOrEmpty(fileName)) 
     { 
      toolStripButtonOpenFile_Click(sender, e); 
     } 
     if (String.IsNullOrEmpty(fileName)) 
     { 
      return; 
     } 
     try 
     { 
      CreateWaveOut(); 
     } 
     catch (Exception driverCreateException) 
     { 
      MessageBox.Show(String.Format("{0}", driverCreateException.Message)); 
      return; 
     } 
     mainOutputStream = CreateInputStream(fileName); 
     trackBarPosition.Maximum = (int)mainOutputStream.TotalTime.TotalSeconds; 
     labelTotalTime.Text = String.Format("{0:00}:{1:00}", (int)mainOutputStream.TotalTime.TotalMinutes, 
      mainOutputStream.TotalTime.Seconds); 
     trackBarPosition.TickFrequency = trackBarPosition.Maximum/30; 
     try 
     { 
      waveOut.Init(mainOutputStream); 
     } 
     catch (Exception initException) 
     { 
      MessageBox.Show(String.Format("{0}", initException.Message), "Error Initializing Output"); 
      return; 
     } 
     // not doing Volume on IWavePlayer any more 
     volumeStream.Volume = volumeSlider1.Volume; 
     waveOut.Play(); 
    } 
    private WaveStream CreateInputStream(string fileName) 
    { 
     WaveChannel32 inputStream; 
     if (fileName.EndsWith(".wav")) 
     { 
      WaveStream readerStream = new WaveFileReader(fileName); 
      if (readerStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm) 
      { 
       readerStream = WaveFormatConversionStream.CreatePcmStream(readerStream); 
       readerStream = new BlockAlignReductionStream(readerStream); 
      } 
      if (readerStream.WaveFormat.BitsPerSample != 16) 
      { 
       var format = new WaveFormat(readerStream.WaveFormat.SampleRate, 
        16, readerStream.WaveFormat.Channels); 
       readerStream = new WaveFormatConversionStream(format, readerStream); 
      } 
      inputStream = new WaveChannel32(readerStream); 
     } 
     else if (fileName.EndsWith(".mp3")) 
     { 
      WaveStream mp3Reader = new Mp3FileReader(fileName); 
      WaveStream pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader); 
      WaveStream blockAlignedStream = new BlockAlignReductionStream(pcmStream); 
      inputStream = new WaveChannel32(blockAlignedStream); 
     } 
     else 
     { 
      throw new InvalidOperationException("Unsupported extension"); 
     } 
     // we are not going into a mixer so we don't need to zero pad 
     //((WaveChannel32)inputStream).PadWithZeroes = false; 
     volumeStream = inputStream; 
     var meteringStream = new MeteringStream(inputStream, inputStream.WaveFormat.SampleRate/10); 
     meteringStream.StreamVolume += new EventHandler<StreamVolumeEventArgs>(meteringStream_StreamVolume); 
     return meteringStream; 
    } 
    void meteringStream_StreamVolume(object sender, StreamVolumeEventArgs e) 
    { 
     volumeMeter1.Amplitude = e.MaxSampleValues[0]; 
     waveformPainter1.AddMax(e.MaxSampleValues[0]); 
     if (e.MaxSampleValues.Length > 1) 
     { 
      volumeMeter2.Amplitude = e.MaxSampleValues[1]; 
      waveformPainter2.AddMax(e.MaxSampleValues[1]); 
     } 
    } 
    private void CreateWaveOut() 
    { 
     CloseWaveOut(); 
     int latency = (int)comboBoxLatency.SelectedItem; 
     //if (radioButtonWaveOut.Checked) 
     { 
      //WaveCallbackInfo callbackInfo = checkBoxWaveOutWindow.Checked ? 
      WaveCallbackInfo callbackInfo = WaveCallbackInfo.FunctionCallback(); 
      // WaveCallbackInfo callbackInfo = WaveCallbackInfo.FunctionCallback(); 
      // WaveCallbackInfo.NewWindow(): WaveCallbackInfo.FunctionCallback(); 
      WaveOut outputDevice = new WaveOut(callbackInfo); 
      outputDevice.DesiredLatency = latency; 
      waveOut = outputDevice; 
     } 
    } 
    private void CloseWaveOut() 
    { 
     if (waveOut != null) 
     { 
      waveOut.Stop(); 
     } 
     if (mainOutputStream != null) 
     { 
      // this one really closes the file and ACM conversion 
      volumeStream.Close(); 
      volumeStream = null; 
      // this one does the metering stream 
      mainOutputStream.Close(); 
      mainOutputStream = null; 
     } 
     if (waveOut != null) 
     { 
      waveOut.Dispose(); 
      waveOut = null; 
     } 
    } 
    private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
    { 
     CloseWaveOut(); 
    } 
    private void Form1_Load(object sender, EventArgs e) 
    { 
     comboBoxLatency.Items.Add(25); 
     comboBoxLatency.Items.Add(50); 
     comboBoxLatency.Items.Add(100); 
     comboBoxLatency.Items.Add(150); 
     comboBoxLatency.Items.Add(200); 
     comboBoxLatency.Items.Add(300); 
     comboBoxLatency.Items.Add(400); 
     comboBoxLatency.Items.Add(500); 
     comboBoxLatency.SelectedIndex = 5; 
    } 
    private void buttonPause_Click(object sender, EventArgs e) 
    { 
     if (waveOut != null) 
     { 
      if (waveOut.PlaybackState == PlaybackState.Playing) 
      { 
       waveOut.Pause(); 
      } 
     } 
    } 
    private void volumeSlider1_VolumeChanged(object sender, EventArgs e) 
    { 
     if (mainOutputStream != null) 
     { 
      volumeStream.Volume = volumeSlider1.Volume; 
     } 
    } 
    private void buttonControlPanel_Click(object sender, EventArgs e) 
    { 
     AsioOut asio = waveOut as AsioOut; 
     if (asio != null) 
     { 
      asio.ShowControlPanel(); 
     } 
    } 
    private void buttonStop_Click(object sender, EventArgs e) 
    { 
     if (waveOut != null) 
     { 
      waveOut.Stop(); 
      trackBarPosition.Value = 0; 
     } 
    } 
    private void timer1_Tick(object sender, EventArgs e) 
    { 
     if (waveOut != null) 
     { 
      if (mainOutputStream.Position >= mainOutputStream.Length) 
      { 
       buttonStop_Click(sender, e); 
      } 
      else 
      { 
       TimeSpan currentTime = mainOutputStream.CurrentTime; 
       trackBarPosition.Value = (int)currentTime.TotalSeconds; 
       labelCurrentTime.Text = String.Format("{0:00}:{1:00}", (int)currentTime.TotalMinutes, 
        currentTime.Seconds); 
      } 
     } 
    } 
    private void trackBarPosition_Scroll(object sender, EventArgs e) 
    { 
     if (waveOut != null) 
     { 
      mainOutputStream.CurrentTime = TimeSpan.FromSeconds(trackBarPosition.Value); 
     } 
    } 
    private void toolStripButtonOpenFile_Click(object sender, EventArgs e) 
    { 
     OpenFileDialog openFileDialog = new OpenFileDialog(); 
     openFileDialog.Filter = "All Supported Files (*.wav, *.mp3)|*.wav;*.mp3|All Files (*.*)|*.*"; 
     openFileDialog.FilterIndex = 1; 
     if (openFileDialog.ShowDialog() == DialogResult.OK) 
     { 
      fileName = openFileDialog.FileName; 
     } 
     } 

     } 
     } 

在此先感谢您。 美好的一天。

Answer 1

我用n音讯，这我如何设置设备：

waveOut = new WaveOut(WaveCallbackInfo.FunctionCallback()) {DeviceNumber = OUTdeviceID }; 

基本上WaveOut有一个属性DeviceNumer默认情况下为-1（Windows默认）。
所以你需要做的是获得你的声音设备的ID，并将它们传递给waveOut