C# 4.0 生成类似声云c的波浪图像#
当我试图通过将mp3流传递给以下函数来生成波形图像时,它会在g.DrawLine调用时引发溢出异常。请纠正我的错误。任何帮助都将不胜感激C# 4.0 生成类似声云c的波浪图像#,c#-4.0,naudio,waveform,C# 4.0,Naudio,Waveform,当我试图通过将mp3流传递给以下函数来生成波形图像时,它会在g.DrawLine调用时引发溢出异常。请纠正我的错误。任何帮助都将不胜感激 public static void DrawNormalizedAudio(ref float[] data, Color color) { Bitmap bmp= new Bitmap(1800,200); int BORDER_WIDTH = 5; int width = bmp.Width - (2 * BO
public static void DrawNormalizedAudio(ref float[] data, Color color)
{
Bitmap bmp= new Bitmap(1800,200);
int BORDER_WIDTH = 5;
int width = bmp.Width - (2 * BORDER_WIDTH);
int height = bmp.Height - (2 * BORDER_WIDTH);
using (Graphics g = Graphics.FromImage(bmp))
{
g.Clear(Color.Black);
Pen pen = new Pen(color);
int size = data.Length;
for (int iPixel = 0; iPixel < width; iPixel++)
{
// determine start and end points within WAV
int start = (int)((float)iPixel * ((float)size / (float)width));
int end = (int)((float)(iPixel + 1) * ((float)size / (float)width));
float min = float.MaxValue;
float max = float.MinValue;
for (int i = start; i < end; i++)
{
float val = data[i];
min = val < min ? val : min;
max = val > max ? val : max;
}
int yMax = BORDER_WIDTH + height - (int)((max + 1) * .5 * height);
int yMin = BORDER_WIDTH + height - (int)((min + 1) * .5 * height);
g.DrawLine(pen, iPixel + BORDER_WIDTH, yMax,
iPixel + BORDER_WIDTH, yMin);
}
}
bmp.Save("D:\\waveimage.png");
}
public float[] FloatArrayFromStream(System.IO.MemoryStream stream)
{
return FloatArrayFromByteArray(stream.GetBuffer());
}
public float[] FloatArrayFromByteArray(byte[] input)
{
float[] output = new float[input.Length / 4];
for (int i = 0; i < output.Length; i++)
{
output[i] = BitConverter.ToSingle(input, i * 4);
}
return output;
}
public static void DrawNormalizedAudio(ref float[]数据,颜色)
{
位图bmp=新位图(1800200);
内部边界宽度=5;
int width=bmp.width-(2*边框宽度);
int height=bmp.height-(2*边框宽度);
使用(Graphics g=Graphics.FromImage(bmp))
{
g、 清晰(颜色为黑色);
钢笔=新钢笔(颜色);
int size=data.Length;
对于(int-iPixel=0;iPixelmax?val:max;
}
int yMax=边框宽度+高度-(int)((最大+1)*.5*高度);
int-yMin=边框宽度+高度-(int)((最小值+1)*.5*高度);
g、 抽绳(钢笔、iPixel+边框宽度、yMax、,
iPixel+边框宽度,yMin);
}
}
bmp.Save(“D:\\waveimage.png”);
}
公共浮点[]FloatArrayFromStream(System.IO.MemoryStream流)
{
返回FloatArrayFromByteArray(stream.GetBuffer());
}
公共浮点[]浮点数组FromByteArray(字节[]输入)
{
float[]输出=新的float[input.Length/4];
for(int i=0;i
我的第一个想法是,您正在绘制一个输出列多于输入列的图像,这将为您提供超出范围的min
和max
(因此yMin
和yMax
)值。我希望在这种情况下,yMin
计算会抛出异常
您应该将yMin
和yMax
值夹紧到画布上绘图区域的大小,然后在调用g.DrawLine
之前(或期间)添加边框宽度
偏移量