c# - 使用NAudio C#减少映射扬声器和麦克风音量的延迟

Question

您好，我正在尝试将系统麦克风音频映射到外部声卡扬声器，并将外部声音卡麦克风音频映射到系统扬声器。通过使用代码

 public void MapForManualCall()
    {
        try
        {
            if (db.getResultOnQuery("SELECT [Value] FROM [dbo].[SystemProperties] where property='RecordingEnabled'").Rows[0][0].ToString().Equals("YES"))
            {
                SystemMic = new NAudio.Wave.WaveInEvent();
                SystemMic.DeviceNumber = 0;
                SystemMic.WaveFormat = new NAudio.Wave.WaveFormat(44100, NAudio.Wave.WaveIn.GetCapabilities(SystemMic.DeviceNumber).Channels);

                SoundcardMic = new NAudio.Wave.WaveInEvent();
                SoundcardMic.DeviceNumber = 1;
                SoundcardMic.WaveFormat = new NAudio.Wave.WaveFormat(44100, NAudio.Wave.WaveIn.GetCapabilities(SoundcardMic.DeviceNumber).Channels);

                //NAudio.Wave.WaveInProvider waveIn = new NAudio.Wave.WaveInProvider(sourceStream);

                // used to set listen property of mic on

                var waveOutReceiver = new NAudio.Wave.WaveOut();
                waveOutReceiver.DeviceNumber = 0;
                // used to wavout caller voice on receiver speaker
                NAudio.Wave.WaveInProvider waveInProviderCaller = new NAudio.Wave.WaveInProvider(SystemMic);
                waveOutReceiver.Init(waveInProviderCaller);
                waveOutReceiver.Play();

                var waveOutCaller = new NAudio.Wave.WaveOut();
                waveOutCaller.DeviceNumber = 1;
                // used to wavout receiver voice on caller speaker
                NAudio.Wave.WaveInProvider waveInProviderReceiver = new NAudio.Wave.WaveInProvider(SoundcardMic);
                waveOutCaller.Init(waveInProviderReceiver);
                waveOutCaller.Play();


                //sourceStream.StartRecording();
                //waveOut.Play();


                // SoundcardMic.DataAvailable += new EventHandler<NAudio.Wave.WaveInEventArgs>(waveIn_DataAvailable1);
                // writer1 = new NAudio.Wave.WaveFileWriter(outputFilenameReceiver, SoundcardMic.WaveFormat);
                SoundcardMic.StartRecording();

                //SystemMic.DataAvailable += new EventHandler<NAudio.Wave.WaveInEventArgs>(waveIn_DataAvailable);
                //writer = new NAudio.Wave.WaveFileWriter(outputFilenameCaller, SystemMic.WaveFormat);
                SystemMic.StartRecording();
                //  MapSpeakerNMic();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("Please Check Headphone and Device Cable Connected Properly!");
        }
    }

上面的代码很完美，但是映射之间有3-4秒的延迟。当我尝试使用Windows 7的Listen功能进行上述任务时，它的工作原理非常完美。对我来说，这可能是读写缓冲区的问题。不知道该怎么做...

Answer 1

延迟是这里的问题。在录制和播放阶段存在延迟。您会发现，不使用ASIO之类的方法很难将其减小到较小的值。但是，所有NAudio API都允许您指定缓冲区大小，这样您就可以了解在退出之前可以走多低。