NAudio 播放流、字節數組（非wav、mp3、aiff格式）

1. 問題

http或websocket通信返回的音頻數據流，導出到音頻文件，然后再用AudioFileReader讀取文件流，可以播放比較多格式的音頻（例如：webm）。但是如果不創建臨時文件，改如何直接播放流MemoryStream?

2. 舉例

• 1、返回的音頻流是webm時，臨時文件法可以正常播放，猜測可以分析讀取文件流的方式，取消掉多余的步驟；

var filename = "./tmp.webm"; using (var audioFile = new AudioFileReader(filename))using (var waveOut = new WaveOutEvent()){waveOut.Init(audioFile);waveOut.Play();while (waveOut.PlaybackState == PlaybackState.Playing)Thread.Sleep(100);}

• 2、查看AudioFileReader構造函數，其中CreateReaderStream方法是成功播放wav、mp3、aiff這3類音頻的關鍵，所以需要找到能MediaFoundationReader相關聯的類；

// 摘要: // Creates the reader stream, supporting all filetypes in the core NAudio library, // and ensuring we are in PCM format // // 參數: // fileName: // File Name private void CreateReaderStream(string fileName) {if (fileName.EndsWith(".wav", StringComparison.OrdinalIgnoreCase)){readerStream = new WaveFileReader(fileName);if (readerStream.WaveFormat.Encoding != WaveFormatEncoding.Pcm && readerStream.WaveFormat.Encoding != WaveFormatEncoding.IeeeFloat){readerStream = WaveFormatConversionStream.CreatePcmStream(readerStream);readerStream = new BlockAlignReductionStream(readerStream);}}else if (fileName.EndsWith(".mp3", StringComparison.OrdinalIgnoreCase)){if (Environment.OSVersion.Version.Major < 6){readerStream = new Mp3FileReader(fileName);}else{readerStream = new MediaFoundationReader(fileName);}}else if (fileName.EndsWith(".aiff", StringComparison.OrdinalIgnoreCase) || fileName.EndsWith(".aif", StringComparison.OrdinalIgnoreCase)){readerStream = new AiffFileReader(fileName);}else{// 一切其他格式音頻IO流讀取方式readerStream = new MediaFoundationReader(fileName);} }

• 3、借助vs代碼智能提示，找到了MediaFoundationReader的子類StreamMediaFoundationReader

public class StreamMediaFoundationReader : MediaFoundationReader {private readonly Stream stream;public StreamMediaFoundationReader(Stream stream, MediaFoundationReaderSettings settings = null){this.stream = stream;Init(settings);}// 省略 }

3. 代碼修改

byte[] buffer; using (var ms = new MemoryStream(buffer))using (var media = new StreamMediaFoundationReader(ms))using (var waveOut = new WaveOutEvent()){waveOut.Init(media);waveOut.Play();while (waveOut.PlaybackState == PlaybackState.Playing)Thread.Sleep(100);}

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