[英]recording wave naudio liblary - poor quality of sound
我正在使用 naudio(使用教程)学习音频编程。 我的程序(C# .net winForms)我有记录和停止按钮。 代码如下所示:
NAudio.Wave.WaveIn sourceStream = null;
NAudio.Wave.WaveFileWriter waveWriter = null;
private void RecordButton_Click(object sender, EventArgs e)
{
int deviceNumber = 0;
sourceStream = new NAudio.Wave.WaveIn();
sourceStream.DeviceNumber = deviceNumber;
sourceStream.WaveFormat = new NAudio.Wave.WaveFormat(44100, NAudio.Wave.WaveIn.GetCapabilities(deviceNumber).Channels);
sourceStream.DataAvailable += new EventHandler<NAudio.Wave.WaveInEventArgs>(sourceStream_DataAvailable);
waveWriter = new NAudio.Wave.WaveFileWriter("d:\\a.wav", sourceStream.WaveFormat);
sourceStream.StartRecording();
}
private void sourceStream_DataAvailable(object sender, NAudio.Wave.WaveInEventArgs e)
{
if (waveWriter == null) return;
waveWriter.WriteData(e.Buffer, 0, e.BytesRecorded);
waveWriter.Flush();
}
private void StopButton_Click(object sender, EventArgs e)
{
waveWriter.Dispose();
waveWriter = null;
}
它可以工作,但波形文件质量不好 - 我录制的声音有很小的差距。 我想要 44100 Hz 的采样率和 16 位的采样格式。
我无法完全复制您发现的内容,但我确实注意到DataAvailable
事件并没有为其他操作留下太多空间。 一个简单的Thread.Sleep(100);
停止应用程序。
假设您的连续写入(和刷新)可能会导致问题,我实现了一个原始Queue
,该Queue
保留要写入的字节并使用线程池中的线程进行实际写入。
DataAvailable
事件现在看起来像这样:
Queue<byte[]> writebuffer = new Queue<byte[]>();
private void sourceStream_DataAvailable(object sender, NAudio.Wave.WaveInEventArgs e)
{
if (waveWriter == null) return;
byte[] realbytes = new byte[e.BytesRecorded];
Array.Copy(e.Buffer, realbytes, e.BytesRecorded);
writebuffer.Enqueue(realbytes);
}
在StartRecording
调用之后,我将任务排队以读取队列并将数据写入流。 如果我在那里添加延迟,应用程序就不再停止。
ThreadPool.QueueUserWorkItem((s) =>
{
var keeprunning = true;
sourceStream.RecordingStopped += (rss, rse) => { keeprunning = false; };
while(keeprunning)
{
if (writebuffer.Count==0)
{
Thread.Sleep(0);
}
else
{
var buf = writebuffer.Dequeue();
waveWriter.Write(buf,0,buf.Length);
// Thread.Sleep(100); // for testing
}
}
waveWriter.Dispose();
waveWriter = null;
});
我也遇到过这个问题。 解决方案是从使用 WaveIn 进行录制切换到 WasapiCapture。 设置和使用几乎相同,但质量要好得多。 试试这个:
public class Recorder
{
public string _outputFolder { get; set; }
public string _outputFilePath { get; set; }
public WasapiCapture _capture { get; set; }
public WaveFileWriter _writer { get; set; }
public Recorder()
{
_outputFolder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "NAudio");
Directory.CreateDirectory(_outputFolder);
_outputFilePath = Path.Combine(_outputFolder, "recorded.wav");
}
public void StartRecording()
{
_capture = new WasapiCapture();
_capture.ShareMode = AudioClientShareMode.Shared;
_capture.WaveFormat = new WaveFormat(44100, 32, 1);
_writer = new WaveFileWriter(_outputFilePath, _capture.WaveFormat);
_capture.DataAvailable += _capture_DataAvailable;
_capture.RecordingStopped += _capture_RecordingStopped; ;
_capture.StartRecording();
}
public void StopRecording()
{
_capture.StopRecording();
}
private void _capture_DataAvailable(object sender, WaveInEventArgs e)
{
_writer.Write(e.Buffer, 0, e.BytesRecorded);
}
private void _capture_RecordingStopped(object sender, StoppedEventArgs e)
{
_writer?.Dispose();
_writer = null;
_capture.Dispose();
_capture = null;
}
}
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