C # Implementation of WAV waveform diagram

Read the information on the Internet, the implementation is not difficult, next to study the FFT

In accordance with the online information, complement/32768

The program is divided into two parts, the definition of WAV format on-line data many

Read WAV, save audio data to TXT

Using system.io;using system;using system.text;namespace audio Processing {class Program {const int bytesample = 2;        const int dataposition = 40; 0x16 2byte 0002 Dual channel//0x22 2byte 0010 16 bit//0x18 4byte 0000ac44 44100 sample rate static void Main (Strin            G[] args) {byte[] length = new byte[4];            FileStream fs = new FileStream ("Test.wav", FileMode.Open, FileAccess.Read); Fs.            Position = dataposition; Fs.            Read (length, 0, 4);            byte[] content = new Byte[gethextoint (length)]; string[] Sample = new string[content.            Length/bytesample]; Fs. Read (content, 0, content.            Length);            Gethex (content);            Sample = Getsample (content);            StreamWriter SW = new StreamWriter ("Data.txt", true, Encoding.default); foreach (String i in sample) {sw.                Flush (); Sw.            WriteLine (i); } SW.        Close (); } static int Gethextoint (byte[] x) {String retvalue = ""; for (int i = x.length-1; I >= 0; i--) {RetValue + = X[i].            ToString ("X");        } return Convert.ToInt32 (RetValue, 16);            } static void Gethex (byte[] x) {byte tmp; for (int i = 0; i < x.length; i++) {tmp = Convert.tobyte (X[i].                ToString ("X"), 16);            X[i] = tmp; }} static string[] Getsample (byte[] x) {string[] RetValue = new String[x.length/bytesa            Mple]; for (int i = 0, i < retvalue.length; i++) {for (int j = (i + 1) * BYTESAMPLE-1; J >= I * Bytesample; j--) {Retvalue[i] + = X[j].                ToString ("X"); } Retvalue[i] = ((double) convert.toint16 (Retvalue[i], 16)/32768).            ToString ("F4");        } return RetValue; }    }} 

Read txt, display waveform

Using system;using system.drawing;using system.text;using system.windows.forms;using System.IO;using        system.collections.generic;using system.threading;namespace loaddataview{public partial class Form1:form {        const BOOL Leftstatus = FALSE;            Public Form1 () {InitializeComponent (); New Thread (new ThreadStart () = {this. Invoke (new MethodInvoker () = {Label1. Text = Leftstatus? "Left channel": "Right channel";                }));                list<double> list = new list<double> ();                StreamReader sr = new StreamReader ("Data.txt", Encoding.default);                int m = 0; while (!SR. Endofstream) {if (leftstatus) {if (m% 2 = = 0) List. ADD (double. Parse (Sr.                    ReadLine ()));                      } else {if (m% 2! = 0)      List. ADD (double. Parse (Sr.                    ReadLine ()));                } m++; } Sr.                Close ();                Bitmap Bitmap = new Bitmap (picturebox1.width, picturebox1.height);                Graphics g = graphics.fromimage (bitmap);                G.smoothingmode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;                G.drawline (New Pen (Color.Black, 5), New Point (+), new Point (20, 540));                G.drawline (New Pen (Color.Black, 5), New Point (A, 290), New Point (1600, 290)); int k = list.                count/1550; for (int i = 0; i < list. Count; i++) {g.drawline (new Pen (Color.green, 1), New Point (+ i/k, 290), new point (+ I                /k, 290 + (int) (List[i] * 250 * 2)));            } this.pictureBox1.Image = bitmap; })).        Start (); private void Form1_Resize (object sender, EventArgs e) {this.          Width = 1650;  This.        Height = 600; }    }}

C # Implementation of WAV waveform diagram