使用 Naudio 或其他设备播放/停止 MP3 队列答案

【问题标题】：Play/Stop MP3 Queue with Naudio or other使用 Naudio 或其他设备播放/停止 MP3 队列
【发布时间】：2017-04-03 13:27:17
【问题描述】：

我在停止/暂停 Mp3 队列时遇到问题。请问有什么帮助吗？我使用 Githup 的这个类。它工作正常，但无法阻止它：

    public class playr
    {
        private Queue<string> playlist;
        private IWavePlayer player = new WaveOutEvent();
        private WaveStream fileWaveStream;

        public playr()
        {

        }
        public playr(List<string> startingPlaylist)
        {
            playlist = new Queue<string>(startingPlaylist);
        }
        public void PlaySong()
        {
            if (playlist.Count < 1)
            {
                return;
            }

                if (player != null && player.PlaybackState != PlaybackState.Stopped)
                {
                    player.Stop();
                }
                if (fileWaveStream != null)
                {
                    fileWaveStream.Dispose();
                }
                if (player != null)
                {
                    player.Dispose();
                    player = null;
                }

                player = new WaveOutEvent();


                fileWaveStream = new NAudio.Wave.Mp3FileReader(playlist.Dequeue(), new Mp3FileReader.FrameDecompressorBuilder(waveFormat => new NLayer.NAudioSupport.Mp3FrameDecompressor(waveFormat)));
                var stream = new BlockAlignReductionStream(fileWaveStream);

            player.Init(fileWaveStream);
            player.Play();
            player.PlaybackStopped += (sender, evn) => { PlaySong(); };


        }


    }

我从 datagridview 弹出 mp3 文件。目标是播放 mp3 声音和绘制图表。

 private void Play_Click(object sender, EventArgs e)
    {
        try
        {
              playlist = new List<string>();
                for (int item = 0; item < dataGridView1.Rows.Count - 1; item++)
                  {
                      playlist.Add(@"mp3Conversion\sounds\" + dataGridView1.Rows[item].Cells["mp3"].Value.ToString());

                  }

                playr playr = new playr(playlist);

                playr.PlaySong();

        }
        catch (Exception ex) { MessageBox.Show(ex.ToString()); }
    }

当我点击停止按钮时它不会停止。有没有办法添加通知器或管理队列？

    private void btnStop_Click(object sender, EventArgs e)
    {
        try
        {

            var playr = new playr(playlist);

            playr.stopit();

        }
        catch (Exception ex) { MessageBox.Show(ex.ToString()); }


    }

【问题讨论】：

标签： c# charts queue mp3

【解决方案1】：

希望现在帮助你还为时不晚

您不能暂停，因为您正在丢失对定义新对象的对象的引用

你可以尝试将对象定义为静态对象来解决这个问题，但你必须非常小心地处理对象或从多线程访问它

一个非常小的例子

    public class playr
{
    private Queue<string> playlist;
    public static IWavePlayer player = new WaveOutEvent();
    // private WaveStream fileWaveStream;

    public playr()
    {

    }
    public playr(List<string> startingPlaylist)
    {
        playlist = new Queue<string>(startingPlaylist);
    }

    public void PlaySong()
    {
        if (playlist.Count < 1)
        {
            return;
        }

        if (player != null && player.PlaybackState != PlaybackState.Stopped)
        {
            player.Stop();
        }

        if (player != null)
        {
            player.Dispose();
            player = null;
        }

        player = new WaveOutEvent();

        var audioFilePath = playlist.First();

        var fileWaveStream = new AudioFileReader(audioFilePath);

        player.Init(fileWaveStream);
        player.Play();
        player.PlaybackStopped += (sender, evn) => { PlaySong(); };
    }
}

然后你可以从表单视图中处理“播放器”对象

【讨论】：