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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：
1 public class pcmplayer
2 {
3 private monotostereoprovider16 monotostereoprovider16;
4 private bufferedwaveprovider bufferedwaveprovider;
5 private waveout waveout;
6 private bool isrunning = false;
7 private pcmplayerchannel currentchannel;
8
9 /// <summary>
10 ///
11 /// </summary>
12 /// <param name="samplerate">采样率8k至64k</param>
13 /// <param name="devicenumber">通过getplaydevices来获取字典的key值</param>
14 /// <param name="playerchannel">初始化时播放的声道</param>
15 public pcmplayer(int samplerate, int devicenumber = 0, pcmplayerchannel playerchannel = pcmplayerchannel.both)
16 {
17 currentchannel = playerchannel;
18 waveformat = new waveformat(samplerate, 16, 1);
19 bufferedwaveprovider = new bufferedwaveprovider(waveformat);
20 monotostereoprovider16 = new monotostereoprovider16(bufferedwaveprovider);
21 waveout = new waveout();
22 waveout.devicenumber = devicenumber;
23 waveout.init(monotostereoprovider16);
24 waveout.play();
25 isrunning = true;
26 }
27
28 public void playdata(byte[] data)
29 {
30 if (!isrunning) return;
31 bufferedwaveprovider.addsamples(data, 0, data.length);
32 }
33
34 public void closeplay()
35 {
36 isrunning = false;
37 waveout.stop();
38 waveout.dispose();
39 }
40
41 public bool setplaychannel(pcmplayerchannel playerchannel)
42 {
43 if (!isrunning || waveout == null || monotostereoprovider16 == null) return false;
44 switch (playerchannel)
45 {
46 case pcmplayerchannel.left:
47 {
48 monotostereoprovider16.leftvolume = 1.0f;
49 monotostereoprovider16.rightvolume = 0.0f;
50 }
51 break;
52 case pcmplayerchannel.right:
53 {
54 monotostereoprovider16.leftvolume = 0.0f;
55 monotostereoprovider16.rightvolume = 1.0f;
56 }
57 break;
58 case pcmplayerchannel.both:
59 {
60 monotostereoprovider16.leftvolume = 1.0f;
61 monotostereoprovider16.rightvolume = 1.0f;
62 }
63 break;
64 default: return false;
65 }
66 return true;
67 }
68
69 public waveformat waveformat { get; private set; }
70
71 public static dictionary<int, waveoutcapabilities> getplaydevices
72 {
73 get
74 {
75 dictionary<int, waveoutcapabilities> result = new dictionary<int, waveoutcapabilities>();
76 try
77 {
78 int count = waveout.devicecount;
79 for (int i = 0; i < count; i++)
80 {
81 var item = waveout.getcapabilities(i);
82 result.add(i, item);
83 }
84 }
85 catch { }
86 return result;
87 }
88 }
89 }
90
91 public enum pcmplayerchannel
92 {
93 left,
94 right,
95 both
96 }
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）
