使用n音讯播放.wav文件，播放1秒后停止 [英] Playing a .wav file using naudio, playback stops after 1 sec

问题描述

我用在C＃中的n音讯lib和想打一个简单的文件。问题是，在1秒钟后的播放停止。我无法弄清楚它之所以这样做的。

 使用系统;
使用System.Collections.Generic;
使用System.Linq的;
使用System.Text;
使用NAudio.Wave;

命名空间NAudioTest
{
    类节目
    {
        静态IWavePlayer waveout的;
        静态的WaveStream的OutputStream;
        静态字符串文件名= NULL;

        静态无效的主要（字串[] args）
        {
            waveout的=新waveout的（）;

            文件名=C：\\ 1.wav;

            的OutputStream = CreateInputStream（文件名）;

            尝试
            {
                waveout.Init（OutputStream的）;
            }
            赶上（例外前）
            {
                Console.WriteLine（错误而载入输出）;
                Console.WriteLine（详细信息：+ ex.Message）;
                到Console.ReadLine（）;
                返回;
            }

            Console.WriteLine（preSS [Enter]键启动播放）;
            到Console.ReadLine（）;

            waveout.Play（）; // 1秒后，该停止。应该发挥它，直到我打进入下一行的原因是什么？

            Console.WriteLine（preSS [Enter]键中止）;
            到Console.ReadLine（）;
            waveout.Dispose（）;
            到Console.ReadLine（）;
        }


        静态的WaveStream CreateInputStream（字符串名称）
        {
            WaveChannel32的InputStream;
            如果（name.EndsWith（。WAV））
            {
                的WaveStream readerStream =新WaveFileReader（名称）;
                如果（readerStream.WaveFor​​mat.Encoding！= WaveFor​​matEncoding.Pcm）
                {
                    readerStream = WaveFor​​matConversionStream.CreatePcmStream（readerStream）;
                    readerStream =新BlockAlignReductionStream（readerStream）;
                }

                如果（readerStream.WaveFor​​mat.BitsPerSample！= 16）
                {
                    VAR格式=新WAVEFORMAT（readerStream.WaveFor​​mat.SampleRate，16，readerStream.WaveFor​​mat.Channels）;
                    readerStream =新WaveFor​​matConversionStream（格式，readerStream）;
                }
                的InputStream =新WaveChannel32（readerStream）;
            }
            其他
            {
                抛出新的InvalidOperationException异常（无效的扩展名）;
            }
            返回InputStream的;
        }
    }
}
 

解决方案

您需要确保您使用的函数回调，如果你正试图从一个控制台应用程序播放音频，因为默认为waveout的是使用窗口回调。

 新waveout的（WaveCallbackInfo.FunctionCallback（））
 

更新：对于较新的版本n音讯的我现在建议您避免函数回调，因为它们会导致死锁在特定的驱动。相反， WaveOutEvent ，它使用事件回调，并在后台线程是preferred机制：

 新WaveOutEvent（）
 

I'm using the naudio lib in C# and want to play a simple file. The problem is, the playback stops after 1 second. I cant figure out the reason why it does that.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NAudio.Wave;

namespace NAudioTest
{
    class Program
    {
        static IWavePlayer waveout;
        static WaveStream outputStream;
        static string filename = null;

        static void Main(string[] args)
        {
            waveout = new WaveOut();

            filename = "C:\\1.wav";

            outputStream = CreateInputStream(filename);

            try
            {
                waveout.Init(outputStream);
            }
            catch (Exception ex)
            {
                Console.WriteLine("Error while loading output");
                Console.WriteLine("Details: " + ex.Message);
                Console.ReadLine();
                return;
            }

            Console.WriteLine("Press [Enter] to start playback");
            Console.ReadLine();

            waveout.Play(); //this stops after 1 sec. should it play until i hit enter cause of the next line?

            Console.WriteLine("Press [Enter] to abort");
            Console.ReadLine();
            waveout.Dispose();
            Console.ReadLine();
        }


        static WaveStream CreateInputStream(string name)
        {
            WaveChannel32 inputStream;
            if (name.EndsWith(".wav"))
            {
                WaveStream readerStream = new WaveFileReader(name);
                if (readerStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm)
                {
                    readerStream = WaveFormatConversionStream.CreatePcmStream(readerStream);
                    readerStream = new BlockAlignReductionStream(readerStream);
                }

                if (readerStream.WaveFormat.BitsPerSample != 16)
                {
                    var format = new WaveFormat(readerStream.WaveFormat.SampleRate, 16, readerStream.WaveFormat.Channels);
                    readerStream = new WaveFormatConversionStream(format, readerStream);
                }
                inputStream = new WaveChannel32(readerStream);
            }
            else
            {
                throw new InvalidOperationException("Invalid extension");
            }
            return inputStream;
        }
    }
}

解决方案

You need to make sure you are using function callbacks if you are trying to play audio from a console app, since the default for WaveOut is to use window callbacks.

new WaveOut(WaveCallbackInfo.FunctionCallback())

Update: With newer versions of NAudio I now recommend that you avoid function callbacks, as they can cause deadlocks with certain drivers. Instead, WaveOutEvent which uses event callbacks and a background thread is the preferred mechanism:

new WaveOutEvent()

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