流写和读？

Question

我正在寻找使这段代码线程安全的解决方案：

private Stream ms = new MemoryStream();
public void PlayMp3FromUrl(string url)
{
    new Thread(delegate(object o)
    {
        var response = WebRequest.Create(url).GetResponse();
        using (var stream = response.GetResponseStream())
        {
            byte[] buffer = new byte[65536]; // 64KB chunks
            int read;
            while ((read = stream.Read(buffer, 0, buffer.Length)) > 0)
            {
                var pos = ms.Position;
                ms.Position = ms.Length;
                ms.Write(buffer, 0, read);
                ms.Position = pos;
            }
        }
    }).Start();

    // Pre-buffering some data to allow NAudio to start playing
    while (ms.Length < 65536*10)
        Thread.Sleep(1000);

    ms.Position = 0;
    using (WaveStream blockAlignedStream = new BlockAlignReductionStream(WaveFormatConversionStream.CreatePcmStream(new Mp3FileReader(ms))))
    {
        using (WaveOut waveOut = new WaveOut(WaveCallbackInfo.FunctionCallback()))
        {
            waveOut.Init(blockAlignedStream);
            waveOut.Play();
            while (waveOut.PlaybackState == PlaybackState.Playing)
            {
                System.Threading.Thread.Sleep(100);
            }
        }
    }
}

当您同时使用NAudio播放时，您无法更改ms.Position ms.Write，是吗？任何使其线程安全的解决方案？

此外，如果流是无尽的或非常大的，如何清除已播放的流部分？

Answer 1

有一个从NAudio源代码中的URL流式传输MP3的示例（查看MP3 streaming demo中的NAudioDemo项目）。我推荐的方法是在将每个MP3帧解码为PCM后，将BufferedWaveProvider填入音频。