public unsafe static extern IntPtr CreateDIBSection(IntPtr hdc, ref Win32.BITMAPINFO pbmi, uint iUsage, ref void *ppvBits, IntPtr hSection, uint dwOffset);
/// <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);
}
}
public unsafe bool Create(IntPtr hWnd, int width, int height)
{
int num1 = width & -16;
if (num1 < width)
{
num1 += 16;
}
int num2 = height & -16;
if (num2 < height)
{
num2 += 16;
}
if (this.Handle != (IntPtr)null && num1 == this._width && num2 == this._height)
{
return(false);
}
this._width = num1;
this._height = num2;
Win32.BITMAPINFO pbmi = new Win32.BITMAPINFO();
pbmi.bmiHeader.biSize = (uint)sizeof(Win32.BITMAPINFOHEADER);
pbmi.bmiHeader.biWidth = num1;
pbmi.bmiHeader.biHeight = -num2;
pbmi.bmiHeader.biPlanes = (ushort)1;
pbmi.bmiHeader.biBitCount = (ushort)32;
pbmi.bmiHeader.biCompression = 0U;
pbmi.bmiHeader.biSizeImage = 0U;
pbmi.bmiHeader.biXPelsPerMeter = 0;
pbmi.bmiHeader.biYPelsPerMeter = 0;
pbmi.bmiHeader.biClrUsed = 0U;
pbmi.bmiHeader.biClrImportant = 0U;
if (this._hDC != (IntPtr)null)
{
Win32.DeleteDC(this._hDC);
this._hDC = (IntPtr)null;
}
if (this._hBitmap != (IntPtr)null)
{
Win32.DeleteObject(this._hBitmap);
this._hBitmap = (IntPtr)null;
}
this._hBitmap = Win32.CreateDIBSection((IntPtr)null, ref pbmi, 0U, ref this.bits, (IntPtr)null, 0U);
if (this._hBitmap == (IntPtr)null)
{
return(false);
}
IntPtr dc = Win32.GetDC(hWnd);
this._hDC = Win32.CreateCompatibleDC(dc);
Win32.ReleaseDC(hWnd, dc);
if (!(this._hDC == (IntPtr)null) && !(Win32.SelectObject(this._hDC, this._hBitmap) == (IntPtr)null))
{
return(true);
}
if (this._hDC != (IntPtr)null)
{
Win32.DeleteDC(this._hDC);
this._hDC = (IntPtr)null;
}
Win32.DeleteObject(this._hBitmap);
this._hBitmap = (IntPtr)null;
return(false);
}
