/// <summary>
/// 打开视频设备
/// </summary>
/// <param name="width">捕获窗口的宽度</param>
/// <param name="height">捕获窗口的高度</param>
/// <returns></returns>
public bool StartWebCam(int width, int height)
{
//byte[] lpszName = new byte[100];
//byte[] lpszVer = new byte[100];
//Win32.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
//this.lwndC = Win32.capCreateCaptureWindowA(lpszName, Win32.WS_CHILD | Win32.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);
//if (Win32.SendMessage(lwndC, Win32.WM_CAP_DRIVER_CONNECT, 0, 0))
//{
// Win32.SendMessage(lwndC, Win32.WM_CAP_SET_PREVIEWRATE, 100, 0);
// Win32.SendMessage(lwndC, Win32.WM_CAP_SET_PREVIEW, true, 0);
// return true;
//}
//else
//{
// return false;
//}
this.lwndC = Win32.capCreateCaptureWindow("My Own Capture Control", Win32.WS_CHILD | Win32.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0); //AVICap类的捕捉窗口
Win32.FrameEventHandler FrameEventHandler = new Win32.FrameEventHandler(FrameCallback);
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_CALLBACK_ERROR, 0, 0); //注册错误回调函数
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_CALLBACK_STATUS, 0, 0); //注册状态回调函数
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0); //注册视频流回调函数
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_CALLBACK_FRAME, 0, FrameEventHandler); //注册帧回调函数
//if (!CapDriverCAPS.fCaptureInitialized)//判断当前设备是否被其他设备连接已经连接
//{
if (Win32.SendMessage(this.lwndC, Win32.WM_CAP_DRIVER_CONNECT, 0, 0))
{
//-----------------------------------------------------------------------
Win32.SendMessage(this.lwndC, Win32.WM_CAP_DRIVER_GET_CAPS, Win32.SizeOf(CapDriverCAPS), ref CapDriverCAPS); //获得当前视频 CAPDRIVERCAPS定义了捕获驱动器的能力，如有无视频叠加能力、有无控制视频源、视频格式的对话框等；
Win32.SendMessage(this.lwndC, Win32.WM_CAP_GET_STATUS, Win32.SizeOf(CapStatus), ref CapStatus); //获得当前视频流的尺寸 存入CapStatus结构
Win32.BITMAPINFO bitmapInfo = new Win32.BITMAPINFO(); //设置视频格式 (height and width in pixels, bits per frame).
bitmapInfo.bmiHeader = new Win32.BITMAPINFOHEADER();
bitmapInfo.bmiHeader.biSize = Win32.SizeOf(bitmapInfo.bmiHeader);
bitmapInfo.bmiHeader.biWidth = mWidth;
bitmapInfo.bmiHeader.biHeight = mHeight;
bitmapInfo.bmiHeader.biPlanes = 1;
bitmapInfo.bmiHeader.biBitCount = 24;
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_PREVIEWRATE, 40, 0); //设置在PREVIEW模式下设定视频窗口的刷新率 设置每40毫秒显示一帧，即显示帧速为每秒25帧
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_SCALE, 1, 0); //打开预览视频的缩放比例
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_VIDEOFORMAT, Win32.SizeOf(bitmapInfo), ref bitmapInfo);
this.mFrameEventHandler = new Win32.FrameEventHandler(FrameCallback);
this.capSetCallbackOnFrame(this.lwndC, this.mFrameEventHandler);
Win32.CAPTUREPARMS captureparms = new Win32.CAPTUREPARMS();
Win32.SendMessage(this.lwndC, Win32.WM_CAP_GET_SEQUENCE_SETUP, Win32.SizeOf(captureparms), ref captureparms);
if (CapDriverCAPS.fHasOverlay)
{
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_OVERLAY, 1, 0); //启用叠加 注：据说启用此项可以加快渲染速度
}
Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_PREVIEW, 1, 0); //设置显示图像启动预览模式 PREVIEW
Win32.SetWindowPos(this.lwndC, 0, 0, 0, width, height, Win32.SWP_NOZORDER | Win32.SWP_NOMOVE); //使捕获窗口与进来的视频流尺寸保持一致
return(true);
}
else
{
flag = false;
return(false);
}
}
private bool capSetCallbackOnFrame(IntPtr lwnd, Win32.FrameEventHandler lpProc)
{
return(Win32.SendMessage(this.lwndC, Win32.WM_CAP_SET_CALLBACK_FRAME, 0, lpProc));
}
