第一次写这种音频文件转化为图像显示，遇到了好多困难，百度了一些方法都不正确，终于自己搞定了。
源码地址：
http://download.csdn.net/download/qq_40006363/10131910
部分主要代码：
class WAVReader //wav 文件读取类
{private string Id; //文件标识
private double Size; //文件大小
private string Type; //文件类型
private string formatId;
private double formatSize; //数值为16或18，18则最后又附加信息
private int formatTag;
private int num_Channels; //声道数目
private int SamplesPerSec; //采样率
private int AvgBytesPerSec; //每秒所需字节数
private int BlockAlign; //数据块对齐单位(每个采样需要的字节数)
private int BitsPerSample; //每个采样需要的bit数
private string additionalInfo; //附加信息
private string dataId;
private int dataSize;
public List<double> wavdata = new List<double>();
public void ReadWAVFile(string filePath) //读取波形文件并显示
{
if (filePath == "") return;
byte[] id = new byte[4];
byte[] size = new byte[4];
byte[] type = new byte[4];
byte[] formatid = new byte[4];
byte[] formatsize = new byte[4];
byte[] formattag = new byte[2];
byte[] numchannels = new byte[2];
byte[] samplespersec = new byte[4];
byte[] avgbytespersec = new byte[4];
byte[] blockalign = new byte[2];
byte[] bitspersample = new byte[2];
byte[] additionalinfo = new byte[2]; //可选
byte[] factid = new byte[4];
byte[] factsize = new byte[4];
byte[] factdata = new byte[4];
byte[] dataid = new byte[4];
byte[] datasize = new byte[4];
using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
using (BinaryReader br = new BinaryReader(fs, Encoding.UTF8))
{
#region RIFF WAVE Chunk
br.Read(id, 0, 4);
br.Read(size, 0, 4);
br.Read(type, 0, 4);
Id = getString(id, 4);
long longsize = bytArray2Int(size);//十六进制转为十进制
Size = longsize * 1.0;
Type = getString(type, 4);
#endregion
#region Format Chunk
br.Read(formatid, 0, 4);
br.Read(formatsize, 0, 4);
br.Read(formattag, 0, 2);
br.Read(numchannels, 0, 2);
br.Read(samplespersec, 0, 4);
br.Read(avgbytespersec, 0, 4);
br.Read(blockalign, 0, 2);
br.Read(bitspersample, 0, 2);
if (getString(formatsize, 2) == "18")
{
br.Read(additionalinfo, 0, 2);
additionalInfo = getString(additionalinfo, 2); //附加信息
}
formatId = getString(formatid, 4);
formatSize = bytArray2Int(formatsize);
byte[] tmptag = composeByteArray(formattag);
formatTag = bytArray2Int(tmptag);
byte[] tmpchanels = composeByteArray(numchannels);
num_Channels = bytArray2Int(tmpchanels); //声道数目
SamplesPerSec = bytArray2Int(samplespersec); //采样率
AvgBytesPerSec = bytArray2Int(avgbytespersec); //每秒所需字节数
byte[] tmpblockalign = composeByteArray(blockalign);
BlockAlign = bytArray2Int(tmpblockalign); //数据块对齐单位(每个采样需要的字节数)
byte[] tmpbitspersample = composeByteArray(bitspersample);
BitsPerSample = bytArray2Int(tmpbitspersample); // 每个采样需要的bit数
#endregion
#region Data Chunk
byte[] d_flag = new byte[1];
while (true)
{
br.Read(d_flag, 0, 1);
if (getString(d_flag, 1) == "d")
{
break;
}
}
byte[] dt_id = new byte[4];
dt_id[0] = d_flag[0];
br.Read(dt_id, 1, 3);
dataId = getString(dt_id, 4);
br.Read(datasize, 0, 4);
dataSize = bytArray2Int(datasize);
List<string> testl = new List<string>();
if (BitsPerSample == 8)
{
for (int i = 0; i < dataSize; i++)
{
byte wavdt = br.ReadByte();
wavdata.Add(wavdt);
}
}
else if (BitsPerSample == 16)
{
for (int i = 0; i < dataSize / 2; i++)
{
short wavdt = br.ReadInt16();
wavdata.Add(wavdt);
}
}
#endregion
}
} //wavdata
}
// 数字节数组转换为int
private int bytArray2Int(byte[] bytArray)
{
return bytArray[0] | (bytArray[1] << 8) | (bytArray[2] << 16) | (bytArray[3] << 24);
}
// 将字节数组转换为字符串
private string getString(byte[] bts, int len)
{
char[] tmp = new char[len];
for (int i = 0; i < len; i++)
{
tmp[i] = (char)bts[i];
}
return new string(tmp);
}
// 组成4个元素的字节数组
private byte[] composeByteArray(byte[] bt)
{
byte[] tmptag = new byte[4] { 0, 0, 0, 0 };
tmptag[0] = bt[0];
tmptag[1] = bt[1];
return tmptag;
}
}
private void button5_Click(object sender, EventArgs e)//画wav波形图
{
WAVReader wr = new WAVReader();
string path = @"E:\work\camer\GDI\GDI\bin\Debug\20171013T035701.wav";
wr.ReadWAVFile(path);
int ww = pictureBox1.Width;
int hh = pictureBox1.Height;
Graphics g = pictureBox1.CreateGraphics();
g.SmoothingMode = SmoothingMode.AntiAlias;
g.DrawLine(new Pen(Color.DarkSeaGreen, 1), new Point(0, hh / 2), new Point(ww, hh / 2));
int prex = 0, prey = 0; //上一个坐标
int x = 0, y = 0;
double k = hh / 2.0 / 32768.0;
for (int i = 0; i < ww; i++)
{
x = i;
y = hh - (int)(wr.wavdata[i * 3] * k + hh / 2);
if (i != 0)
{
g.DrawLine(new Pen(Color.Red, 1), x, y, prex, prey);
}
prex = x;
prey = y;
}