C#实现wav波形图

using System.IO;
using System;
using System.Text;

namespace 音频处理
{
class Program
{
const int byteSample = 2;
const int dataPosition = 40;
//0x16 2byte 0002  双声道
//0x22 2byte 0010  16位
//0x18 4byte 0000AC44   44100采样率

static void Main(string[] 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 / byteSample];

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;
}
}
}

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 ? "左声道" : "右声道"; }));
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(20, 20), new Point(20, 540));
g.DrawLine(new Pen(Color.Black, 5), new Point(20, 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(20 + i / k, 290), new Point(20 + 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;
}
}
}