简单实用的PCM音频播放器--沉寂几年之后回归的第一份笔记

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PCM音频网络流播放，至于用处，就不多解释了。

一个简单的类，基于NAudio，一个简单的拼装类，实例化时三个参数，依次是采样率，系统播放设备Index，播放声道，调用PlayData方法传入PCM的音频流即可，有流就传进去，数据断了，播放自动停。

接下来把代码贴出来：

 public class PCMPlayer
     {
         private MonoToStereoProvider16 monoToStereoProvider16;
         private BufferedWaveProvider bufferedWaveProvider;
         private WaveOut waveOut;
         private bool isRunning = false;
         private PCMPlayerChannel currentChannel;

         /// <summary>
         ///
         /// </summary>
         /// <param name="sampleRate">采样率8K至64K</param>
         /// <param name="deviceNumber">通过GetPlayDevices来获取字典的KEY值</param>
         /// <param name="playerChannel">初始化时播放的声道</param>
         public PCMPlayer(int sampleRate, int deviceNumber = , PCMPlayerChannel playerChannel = PCMPlayerChannel.Both)
         {
             currentChannel = playerChannel;
             WaveFormat = new WaveFormat(sampleRate, , );
             bufferedWaveProvider = new BufferedWaveProvider(WaveFormat);
             monoToStereoProvider16 = new MonoToStereoProvider16(bufferedWaveProvider);
             waveOut = new WaveOut();
             waveOut.DeviceNumber = deviceNumber;
             waveOut.Init(monoToStereoProvider16);
             waveOut.Play();
             isRunning = true;
         }

         public void PlayData(byte[] data)
         {
             if (!isRunning) return;
             bufferedWaveProvider.AddSamples(data, , data.Length);
         }

         public void ClosePlay()
         {
             isRunning = false;
             waveOut.Stop();
             waveOut.Dispose();
         }

         public bool SetPlayChannel(PCMPlayerChannel playerChannel)
         {
             if (!isRunning || waveOut == null || monoToStereoProvider16 == null) return false;
             switch (playerChannel)
             {
                 case PCMPlayerChannel.Left:
                     {
                         monoToStereoProvider16.LeftVolume = 1.0f;
                         monoToStereoProvider16.RightVolume = 0.0f;
                     }
                     break;
                 case PCMPlayerChannel.Right:
                     {
                         monoToStereoProvider16.LeftVolume = 0.0f;
                         monoToStereoProvider16.RightVolume = 1.0f;
                     }
                     break;
                 case PCMPlayerChannel.Both:
                     {
                         monoToStereoProvider16.LeftVolume = 1.0f;
                         monoToStereoProvider16.RightVolume = 1.0f;
                     }
                     break;
                 default: return false;
             }
             return true;
         }

         public WaveFormat WaveFormat { get; private set; }

         public static Dictionary<int, WaveOutCapabilities> GetPlayDevices
         {
             get
             {
                 Dictionary<int, WaveOutCapabilities> result = new Dictionary<int, WaveOutCapabilities>();
                 try
                 {
                     int count = WaveOut.DeviceCount;
                     for (int i = ; i < count; i++)
                     {
                         var item = WaveOut.GetCapabilities(i);
                         result.Add(i, item);
                     }
                 }
                 catch { }
                 return result;
             }
         }
     }

     public enum PCMPlayerChannel
     {
         Left,
         Right,
         Both
     }

预告：下一篇简单讲一下音频流网络传输时压缩与解压（基于NSpeex的音频10倍压缩，肉耳听不出损耗）