Naudio-'WaveOut'不包含带有'3'参数的构造函数

Question

this question derives from my previous thread Play mp3 from internet without FileOpenDialog

I really hope someone knows anything about this. I was told to use a WebRequest to start a download stream and then play the stream instead of playing a locally stored file. However, trying to use the code from PlayMp3FromUrl gives me this error:

"'NAudio.Wave.WaveOut' does not contain a constructor that takes '3' arguments"

Compiling failes at this line:

using (WaveOut waveOut = new WaveOut(0, 500, null))

This is the full code:

public static void PlayMp3FromUrl(string url)
    {
        using (MemoryStream ms = new MemoryStream())
        {
            using (Stream stream = WebRequest.Create(url)
                .GetResponse().GetResponseStream())
            {
                byte[] buffer = new byte[32768];
                int read;
                while ((read = stream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    ms.Write(buffer, 0, read);
                }
            }

            ms.Position = 0;

            using (WaveStream blockAlignedStream =
                new BlockAlignReductionStream(
                    WaveFormatConversionStream.CreatePcmStream(
                        new Mp3FileReader(ms))))
            {
                using (WaveOut waveOut = new WaveOut(0, 500, null))
                {
                    waveOut.Init(blockAlignedStream);
                    waveOut.Play();
                    while (blockAlignedStream.Position < blockAlignedStream.Length)
                    {
                        System.Threading.Thread.Sleep(100);
                    }
                }
            }
        }
    }

Can someone help me find out which arguments the WaveOut takes?

Edit: You probably want to look at the WaveOut.cs, and it's pretty long. So just have a look at it here WaveOut.cs

Answer 1

I've never used the waveout class, I would suggest using DirectX if you could.

using (IWavePlayer directOut = new DirectSoundOut(300))               
{                    
   directOut.Init(blockAlignedStream);                    
   directOut.Play();                    
   while (blockAlignedStream.Position < blockAlignedStream.Length)
   {                       
      System.Threading.Thread.Sleep(100);                    
   }                
}

Answer 2

Just use the default constructor (no parameters). The very latest NAudio code has properties on the WaveOut class instead of the old constructor with 3 parameters. If it causes lots of problems I might put the old constructor back though and mark it with the [Obsolete] attribute.

The first parameter was the device number. 0 means use the default device.

The second was the latency. 500ms is the amount of audio we buffer up in advance. This is a very conservative figure and should ensure glitch free playback.

The third is to do with the callback mechanism for waveOut. Unfortunately there is no one-size-fits all solution. If you pass null, NAudio will use function callbacks, but this can hang on certain audio chipsets. It's better to pass a window handle if at all possible.

Answer 3

You are passing three arguments to the WaveOut constructor: 0, 500, null but there is no constructor on the WaveOut class that takes that many arguments.

Why are you passing three arguments to the WaveOut constructor?