使用DirectX播放音頻數據流

使用directX插件可以播放音頻數據流
現在做一個測試項目，首先將信號發生器產生的正弦波（cw波)輸入到語音編碼器編碼，再講編碼的數據用解碼算法解碼，解碼輸出的數據流就是cw波。這個過程主要目的為了測試解碼算法是否能恢復cw波。暫時不考慮這個目的
項目流程
信號發生器(cw波)—->語音編碼（encode）—–>解碼算法（cw波）—->解碼算法（cw波）——>寫入到DirectX緩沖區 —->播放

本文是要實現用DirectX音頻數據流，其實就是將音頻數據流寫到DirectX的緩沖區并播放，分為以下三步。
1.首先分析音頻文件wav的格式，wav格式
2. 將音頻數據流寫到wav格式中data chunk
3. DirectX播放wav數據流。
代碼如下

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using Microsoft.DirectX; using Microsoft.DirectX.DirectSound; using System.IO;namespace playwav {public partial class Form1 : Form{public const int SampleBitWidth = 16; //每個sample 包含 16bitspublic const int SampleByteWidth = 16 >> 3;// 每個sample 包含 2個byte， 每幀包含160 samplepublic const int SampleRate = 8000; //每秒采樣8000個sample。每秒讀取 8000*2 =16000bytesBinaryWriter writer;MemoryStream mes;byte[] voice; public Form1(){InitializeComponent();}private void buttonPlay_Click(object sender, EventArgs e){write_wavfmt(9,1); //9*frame=9*160samplesBinaryReader stream = new BinaryReader(mse);Stream a = stream.BaseStream;Device dev = new Device();dev.SetCooperativeLevel(this, CooperativeLevel.Normal);SecondaryBuffer sec = new SecondaryBuffer(a,Convert.ToInt32(a.Length),dev);sec.Play(0, BufferPlayFlags.Looping);}public void write_wavfmt(int framecount, int channelcount){int datalength = framecount * 160 * 2 * channelcount; //每幀160sample =160*2bytesint riffLength = datalength + 46;voice = new byte[riffLength];mes = new MemoryStream(voice);writer = new BinaryWriter(mes);//////////////wavfmt///////this.writer.Write(ASCIIEncoding.ASCII.GetBytes("RIFF"));this.writer.Write((int)riffLength);this.writer.Write(ASCIIEncoding.ASCII.GetBytes("WAVEfmt"));this.writer.Write((int)16);this.writer.Write((short)1);this.writer.Write((short)channelcount);this.writer.Write((int)SampleRate);this.writer.Write((int)SampleRate * SampleByteWidth * channelcount);//byteRate = SampleRate * SampleByteWidththis.writer.Write((short)SampleBitWidth * channelcount);this.writer.Write((short)SampleBitWidth);this.writer.Write(ASCIIEncoding.ASCII.GetBytes("data"));this.writer.Write((int)datalength);byte[] data = Get_cw_Content(datalength);//讀取cw音頻數據。this.writer.Write(data);this.writer.BaseStream.Seek(0, SeekOrigin.Begin);}public byte[] Get_cw_Content(int datalength){List<short> listData = new List<short>();string cw_path2 = System.Environment.CurrentDirectory+ "\\tone.txt";string read = string.Empty;using (StreamReader sr = new StreamReader(cw_path2)){read = sr.ReadLine();while (read != null) {listData.Add(Convert.ToInt16(read));read = sr.ReadLine();}}byte[] cw_data = new byte[datalength];MemoryStream mestream = new MemoryStream(cw_data);BinaryWriter bwriter = new BinaryWriter(mestream);for (int i = 0; i < datalength/2; i++)bwriter.Write(listData[i]);bwriter.Close();return cw_data;}} }

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