Windows 8 xaudio2在多点触控应用程序中播放wav文件

Question

我正在学习如何使用xAudio2。在Visual Studio 2012 Express for Windows 8中制作了一个简单的Windows 8应用程序。 简单的xAudio2播放器类：

public class SoundEffect 
{
    readonly XAudio2 _xaudio;
    readonly WaveFormat _waveFormat;
    readonly AudioBuffer _buffer;
    readonly SoundStream _soundstream;
    SourceVoice sourceVoice;

    public SoundEffect(string soundFxPath)
    {
        _xaudio = new XAudio2();
        var masteringsound = new MasteringVoice(_xaudio);

        var nativefilestream = new NativeFileStream(
        soundFxPath,
        NativeFileMode.Open,
        NativeFileAccess.Read,
        NativeFileShare.Read);

        _soundstream = new SoundStream(nativefilestream);
        _waveFormat = _soundstream.Format;
        _buffer = new AudioBuffer
        {
            Stream = _soundstream.ToDataStream(),
            AudioBytes = (int)_soundstream.Length,
            Flags = BufferFlags.EndOfStream
        };
        //sourceVoice = null;


    }

    public void Play()
    {
            sourceVoice = new SourceVoice(_xaudio, _waveFormat, true);

            if (sourceVoice != null)
            {
                sourceVoice.FlushSourceBuffers();
                sourceVoice.SubmitSourceBuffer(_buffer, _soundstream.DecodedPacketsInfo);

                sourceVoice.Start();
            }
    }
    public void Stop()
    {
        sourceVoice.Stop();
    }
}

和Xaml：

<Border Background="Gray" MinHeight="150" MinWidth="150" Margin="10,10,0,0" x:Name="A"  PointerPressed="btnAPointerPressed" PointerReleased="btnAPointerReleased" />

和

private SoundEffect shotEffect = new SoundEffect(@"sounds\mywav.wav");
        private void btnAPointerPressed(object sender, PointerRoutedEventArgs e)
    {
        bool _hasCapture = ((Border)sender).CapturePointer(e.Pointer);
        shotEffect.Play();
    }

    private void btnAPointerReleased(object sender, PointerRoutedEventArgs e)
    {
        ((Border)sender).ReleasePointerCapture(e.Pointer);
        shotEffect.Stop();
    }

在Windows 8 Simulator中测试。 如果我按一个手指，那么一切都很好。 当我点击按钮时 - 当我放开手指时声音播放 - 声音停止。

如果我用两根手指点击并放开两根手指，声音会继续播放。结果就是别名。

调用两个事件：btnAPointerPressed和两个事件：btnAPointerReleased但声音继续播放。好像音频流冻结并继续播放。好像音频流冻结并继续播放。 我想了解haudio2的问题？或者我做得不好？

Answer 1

当您再次致电Play()时，之前的SourceVoice会被SoundEffect中的新{{1}}取代，但您永远不会停止旧的{{1}}。您应该在每次触摸时创建一个新的SourceVoice，但要将它们全部与指针ID相关联，这样我们就可以在释放相关指针时停止它们。