我正在使用NAudio(但它适用于直接读取)来捕获麦克风波数据。看来,如果我的应用程序很忙,它将丢弃/跳过麦克风中的一些输入数据。
我已将读取线程设置为最高优先级,但是我同时在其他多个线程中进行了大量计算。
有没有一种无损读取数据的方法?
(或者它是无损的,我的错误在其他地方吗?)
最佳答案
当我制作一个类似的应用程序并遇到类似的问题时,事实证明我需要一个缓冲区,该缓冲区可以保存至少3秒钟的数据。尝试将缓冲区增加到10秒的数据,如果不能解决您的问题,则还有更多问题。如果可行,请尝试减小缓冲区大小,直到正常工作为止
编辑:在这里快速和肮脏的管理dx录音,供您尝试。
public class BMSRecordingEventArgs : EventArgs
{
byte[] data;
bool endRec;
public BMSRecordingEventArgs(byte[] data, bool endRec)
{
this.data = data;
this.endRec = endRec;
}
public byte[] Data
{
get { return data; }
}
public bool EndRec
{
get { return endRec; }
}
}
public class AudioRecorder
{
public delegate void DataReceivedHandler(object sender, BMSRecordingEventArgs e);
public event DataReceivedHandler DataReceivedHandle;
public const int CAPTURE_BUFFER_SIZE = 32000;
DXS.Capture dxsCapDev;
DXS.CaptureBuffer dxsCapBuffer;
DXS.CaptureBufferDescription dxsCapBufferDesc;
System.Threading.Thread thrdCapturingThread;
DXS.BufferPositionNotify[] dxsBpna;
private volatile bool StopRec;
System.Threading.ManualResetEvent mreStillRunning = new System.Threading.ManualResetEvent(false);
DXS.BufferPositionNotify dxsBPNHalf;
DXS.BufferPositionNotify dxsBPNFull;
DXS.Notify Notify;
System.Threading.AutoResetEvent ARE;
public AudioRecorder(Guid DeviceGuid,DXS.WaveFormat wfWaveFormat,DXS.CaptureEffectDescription[] dxsCapEffectDesc)
{
dxsCapDev = new Microsoft.DirectX.DirectSound.Capture(DeviceGuid);
dxsCapBufferDesc = new Microsoft.DirectX.DirectSound.CaptureBufferDescription();
dxsCapBufferDesc.BufferBytes = CAPTURE_BUFFER_SIZE;
dxsCapBufferDesc.Format = wfWaveFormat;
dxsCapBufferDesc.WaveMapped = true;
dxsCapBufferDesc.CaptureEffectDescription = dxsCapEffectDesc;
dxsCapBufferDesc.ControlEffects = true;
dxsCapBuffer = new Microsoft.DirectX.DirectSound.CaptureBuffer(dxsCapBufferDesc, dxsCapDev);
ARE = new System.Threading.AutoResetEvent(false);
dxsBPNHalf = new Microsoft.DirectX.DirectSound.BufferPositionNotify();
dxsBPNFull = new Microsoft.DirectX.DirectSound.BufferPositionNotify();
dxsBPNHalf.Offset = CAPTURE_BUFFER_SIZE / 2 - 1;
dxsBPNFull.Offset = CAPTURE_BUFFER_SIZE-1;
dxsBPNFull.EventNotifyHandle = ARE.SafeWaitHandle.DangerousGetHandle();
dxsBPNHalf.EventNotifyHandle = ARE.SafeWaitHandle.DangerousGetHandle();
dxsBpna = new Microsoft.DirectX.DirectSound.BufferPositionNotify[2];
dxsBpna[0] = dxsBPNHalf;
dxsBpna[1] = dxsBPNFull;
Notify = new Microsoft.DirectX.DirectSound.Notify(dxsCapBuffer);
Notify.SetNotificationPositions(dxsBpna);
}
public void StartRecording()
{
if (thrdCapturingThread != null)
throw new Exception("Already Recording !");
StopRec = false;
thrdCapturingThread = new System.Threading.Thread(Record);
thrdCapturingThread.Start();
}
private void Record()
{
DataReceivedHandler drh2 = DataReceivedHandle;
dxsCapBuffer.Start(true);
byte[] TempBaf = new byte[CAPTURE_BUFFER_SIZE / 2];
int StartingOffset = 0;
while (dxsCapBuffer.Capturing && !StopRec)
{
ARE.WaitOne(-1,false);
StartingOffset %= CAPTURE_BUFFER_SIZE;
TempBaf = (byte[])dxsCapBuffer.Read(StartingOffset, typeof(byte), Microsoft.DirectX.DirectSound.LockFlag.FromWriteCursor, CAPTURE_BUFFER_SIZE / 2);
StartingOffset += TempBaf.Length;
if (drh2 != null)
drh2(this, new BMSRecordingEventArgs(TempBaf, false));
}
dxsCapBuffer.Stop();
if (drh2 != null)
drh2(this, new BMSRecordingEventArgs(TempBaf, true));
mreStillRunning.Set();
}
public void StopRecording()
{
StopRec = true;
mreStillRunning.WaitOne(-1,false);
thrdCapturingThread = null;
}
}