/// <summary>
/// 绘制波形
/// </summary>
/// <param name="win"></param>
/// <param name="waveQueueData"></param>
/// <param name="polylineStyle"></param>
/// <param name="id">区分线程，调试用</param>
static void DrawWave(Window win, FixedQueueArray <float> waveQueueData, bool polylineStyle, int id = 0)
{
var lineColor = Color.FromRgb(17, 125, 187);
var lineBrush = new SolidColorBrush(lineColor);
lineBrush.Freeze();
var pen = new Pen(lineBrush, 1);
pen.Freeze();
// WindowGraphics 这是一个可以跨进程绘制窗体的类
// 使用 WPF 中的 DrawingContext 进行绘制
var wg = new WindowGraphics(win);
while (true)
{
Task.Delay(20).Wait();
using (var drawCtx = wg.OpenDraw()) {
Span <float> waveData = new float[(int)drawCtx.Size.Width];
waveQueueData.Read(waveData);
drawCtx.DrawingContext.DrawRectangle(Brushes.White, null, new Rect(drawCtx.Size));
DrawBorder(drawCtx);
var h2 = drawCtx.Size.Height / 2;
Point[] points;
if (polylineStyle)
{
const int step = 10;
points = new Point[waveData.Length / step + 1];
for (int i = 0; i < points.Length; i++)
{
double sum = 0;
int count = 0;
for (int j = 0; j < step; j++)
{
if (i * step + j >= waveData.Length)
{
break;
}
sum += waveData[i * step + j];
count++;
}
var avg = count > 0 ? sum / count : 0;
points[i] = new Point(i * step, h2 + avg * h2);
}
points[points.Length - 1].X = drawCtx.Size.Width;
}
else
{
points = new Point[waveData.Length];
for (int i = 0; i < waveData.Length; i++)
{
double y = waveData[i] * h2;
points[i] = new Point(i, h2 + y);
}
}
var geometry = new StreamGeometry();
using (var geometryCtx = geometry.Open()) {
geometryCtx.BeginFigure(points[0], false, false);
geometryCtx.PolyLineTo(points, true, true);
}
geometry.Freeze();
drawCtx.DrawingContext.DrawGeometry(null, pen, geometry);
}
}
}
static void Main(string[] args)
{
// 先注入一个dll，Hook要绘制的窗体的WndProc函数，吃掉WM_PAINT消息，不然任务管理器会闪烁
var dllInjectionContext = DllInjection.Injection("Taskmgr", Path.Combine(Environment.CurrentDirectory, "HookWinProc.dll"));
controlCtrlDelegate = type => {
switch (type)
{
case 0: // CTRL_C_EVENT
case 2: // CTRL_CLOSE_EVENT
case 5: // CTRL_LOGOFF_EVENT
case 6: // CTRL_SHUTDOWN_EVENT
// 控制台关闭后清理掉注入的dll
DllInjection.FreeLibrary(dllInjectionContext);
break;
}
return(true);
};
SetConsoleCtrlHandler(controlCtrlDelegate, true);
// 获得CPU核心数，其实我之后的代码已经写死默认是4个核心的情况
var kernelCount = Environment.ProcessorCount;
var hwnd = WinApi.FindWindow("TaskManagerWindow", "任务管理器");
var root = new Window(hwnd);
if (root.Childs.Count == 1 && root.Childs[0].ClassName == "NativeHWNDHost")
{
root = root.Childs[0];
}
else
{
throw new Exception("未找到窗体");
}
if (root.Childs.Count == 1 && root.Childs[0].ClassName == "DirectUIHWND")
{
root = root.Childs[0];
}
else
{
throw new Exception("未找到窗体");
}
// 拿到4个子窗体，但是顺序还不确定
var drawWindows = root.Childs
.Where(w => w.ClassName == "CtrlNotifySink" && w.Childs.Count == 1 && w.Childs[0].ClassName == "CvChartWindow")
.Select(w => w.Childs[0])
.OrderByDescending(w => w.Rect.Width * w.Rect.Height)
.Take(kernelCount)
.ToArray();
// 以下是捕获声音有关的代码，使用的是WASAPI Loopback的方式
var screenWidth = WinApi.GetScreenWidth();
FixedQueueArray <float> leftWaveQueue = new FixedQueueArray <float>(screenWidth), rightWaveQueue = new FixedQueueArray <float>(screenWidth);
IWaveIn loopbackCapture = new WasapiLoopbackCapture();
var observer = new StreamObserver <float>(FFTSize, FFTSize / 2, 2);
float[] leftFixedWaveData = new float[FFTSize], rightFixedWaveData = new float[FFTSize];
// 捕获声音
// leftFixedWaveData 和 rightFixedWaveData 之后会交给绘制频谱的线程处理
observer.Completed += newData => {
lock (fftLock) {
for (int i = 0; i < leftFixedWaveData.Length; i++)
{
leftFixedWaveData[i] = newData[2 * i + 0];
rightFixedWaveData[i] = newData[2 * i + 1];
}
}
};
// 捕获声音
// leftWaveQueue 和 rightWaveQueue 之后会交给绘制声波的线程处理
loopbackCapture.DataAvailable += (_, e) => {
var waveData = MemoryMarshal.Cast <byte, float>(new ReadOnlySpan <byte>(e.Buffer, 0, e.BytesRecorded));
int copyLength = Math.Min(waveData.Length / 2, screenWidth);
if (copyLength == 0)
{
return;
}
Span <float> leftNextData = stackalloc float[copyLength], rightNextData = stackalloc float[copyLength];
for (int i = 0; i < copyLength; i++)
{
leftNextData[i] = waveData[2 * i + 0];
rightNextData[i] = waveData[2 * i + 1];
}
leftWaveQueue.Write(leftNextData);
rightWaveQueue.Write(rightNextData);
observer.Write(waveData);
};
loopbackCapture.StartRecording();
var sampleRate = loopbackCapture.WaveFormat.SampleRate;
bool polylineStyle = false;
// 找出对应位置的子窗体
var leftTopWin = drawWindows.OrderBy(w => w.Rect.X + w.Rect.Y).First();
var rightTopWin = drawWindows.OrderBy(w => - w.Rect.X + w.Rect.Y).First();
var leftBottomWin = drawWindows.OrderBy(w => w.Rect.X - w.Rect.Y).First();
var rightBottomWin = drawWindows.OrderBy(w => - w.Rect.X - w.Rect.Y).First();
void StartThread(Action action)
{
new Thread(new ThreadStart(action))
{
Priority = ThreadPriority.Highest
}.Start();
}
// 启动线程开始捕获声音并绘制，每个窗体一个线程
StartThread(() => DrawWave(leftTopWin, leftWaveQueue, polylineStyle, 1));
StartThread(() => DrawWave(rightTopWin, rightWaveQueue, polylineStyle, 2));
StartThread(() => DrawSpectrum(leftBottomWin, leftFixedWaveData, sampleRate, polylineStyle, 3));
StartThread(() => DrawSpectrum(rightBottomWin, rightFixedWaveData, sampleRate, polylineStyle, 4));
Thread.Sleep(Timeout.Infinite);
}