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分享VFW视频捕获显示问题
描述：
采用VFW捕获视频。在capSetCallbackOnVideoStream的回调函数中，将LPVIDEOHDR中的数据传递给显示视频的窗口ShowVideoDlg（里面有显示视频的函数：ShowVideo2Window）。然后在ShowVideo2Window中用DrawDibDraw将传递的LPVIDEOHDR中的数据显示出来。
其显示出来的效果如图：
，左上角是直接预览的。而右下角的线条视频是在ShowVideo2Window中显示出来的。
我的程序是参考了网上的一个代码，并且其运行他的代码效果也是一样的。我将这个程序编译然后在别的电脑上运行了下，效果也一样。
问题：
（1）有谁遇到过这是什么问题呢？有好的解决办法没。（不准备采用directShow,就针对这个问题）
（2）既然能预览视频，那么与摄像头与显示无关。而且参考的代码也有不少人说好，没有人出现我这样的问题，所以，猜测可能是与我硬件方面有关。但是在别的电脑上运行效果一样，我就不知道该如何判断了。但是，我猜测可能是捕获的视频数据有问题。会不会是我捕获的数据格式问题。不是rgb格式的数据。因此，问题是：我有没有办法分析出这些捕获的数据是RGB的还是什么格式的？
采用VFW捕获视频。在capSetCallbackOnVideoStream的回调函数中，将LPVIDEOHDR中的数据传递给显示视频的窗口ShowVideoDlg（里面有显示视频的函数：ShowVideo2Window）。然后在ShowVideo2Window中用DrawDibDraw将传递的LPVIDEOHDR中的数据显示出来。
其显示出来的效果如图：
，左上角是直接预览的。而右下角的线条视频是在ShowVideo2Window中显示出来的。我的程序是参考了网上的一个代码，并且其运行他的代码效果也是一样的。我将这个程序编译然后在别的电脑上运行了下，效果也一样。
问题：
（1）有谁遇到过这是什么问题呢？有好的解决办法没。（不准备采用directShow,就针对这个问题）
（2）既然能预览视频，那么与摄像头与显示无关。而且参考的代码也有不少人说好，没有人出现我这样的问题，所以，猜测可能是与我硬件方面有关。但是在别的电脑上运行效果一样，我就不知道该如何判断了。但是，我猜测可能是捕获的视频数据有问题。会不会是我捕获的数据格式问题。不是rgb格式的数据。因此，问题是：我有没有办法分析出这些捕获的数据是RGB的还是什么格式的？
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Tiffany_chen 2015-10-28
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@满衣兄 太感谢你了，直接就把我纠结了三天的win7下VFW视频采集黑屏的问题解决了！太感谢了！也谢谢楼主的问题。才有这种解决方法，
赞一个！值得分享！！！
赞一个！值得分享！！！
beautive 2013-11-21
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最近也遇到了同样的问题，能把你代码发给我学习学习么？jishao538@163.com
满衣兄 2013-05-24
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大哥，改好了：
Initialize中BITMAPINFO注释掉一部分，不然capSetVideoFormat函数调用失败，另外将返回值改成1。
capSetVideoFormat函数调用失败的原因应该是你自己填充的格式不支持。
代码已发送到你邮箱，结贴哦。
BOOL VideoCapture::Initialize(CVideoShowDlg *thisS)
{
TCHAR szName[MAX_PATH] = {0};
TCHAR szVer[MAX_PATH] = {0};
BOOL bRet = capGetDriverDescription(0, szName, MAX_PATH, szVer, MAX_PATH);
if (!bRet)
{
return -1;
}
HWND m_hWnd = capCreateCaptureWindow(szName, WS_VISIBLE | WS_CHILD, 100, 100, 100, 100, thisS->m_hWnd, 0);
capSetUserData(m_hWnd,this);
int tryTimes = 0;
bool ret = FALSE;
while ((ret = capDriverConnect(m_hWnd, 0)) != TRUE)
{
if(++tryTimes > 10)
break;
}
if(ret == TRUE)
{
capPreviewRate(m_hWnd, 66);
capPreview(m_hWnd, TRUE);
capPreviewScale(m_hWnd, TRUE);
//BITMAPINFO bitmapinfo;
//bitmapinfo.bmiHeader.biSize = sizeof(bitmapinfo.bmiHeader);
//bitmapinfo.bmiHeader.biWidth = 100;
//bitmapinfo.bmiHeader.biHeight = 100;
//bitmapinfo.bmiHeader.biPlanes = 1;
//bitmapinfo.bmiHeader.biBitCount = 24;*/
capGetVideoFormat(m_hWnd,&m_bmpinfo,sizeof(m_bmpinfo)); //获得当前video格式
//m_bmpinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
m_bmpinfo.bmiHeader.biWidth = IMAGE_WIDTH;
m_bmpinfo.bmiHeader.biHeight = IMAGE_HEIGHT;
//m_bmpinfo.bmiHeader.biBitCount = 24;
//m_bmpinfo.bmiHeader.biPlanes = 1;
//m_bmpinfo.bmiHeader.biCompression = BI_RGB;//采用RGB压缩格式
//m_bmpinfo.bmiHeader.biSizeImage =IMAGE_WIDTH*IMAGE_HEIGHT*3;
//m_bmpinfo.bmiHeader.biXPelsPerMeter = 0;
//m_bmpinfo.bmiHeader.biYPelsPerMeter = 0;
//m_bmpinfo.bmiHeader.biClrUsed =0;
//m_bmpinfo.bmiHeader.biClrImportant = 0;
BOOL ret=capSetVideoFormat(m_hWnd,&m_bmpinfo,sizeof(m_bmpinfo));
//capSetVideoFormat(m_hWnd, &m_bmpinfo, sizeof(m_bmpinfo));
capSetCallbackOnFrame(m_hWnd, OnCaptureVideo);
//设置视频流回调函数
//将user数据设为AVIOMgr对象指针
if(!capSetUserData(m_hWnd,(DWORD)this))
return 1;
SetWindowPos(m_hWnd, NULL, 500, 500, 100,
100, SWP_NOZORDER | SWP_NOMOVE);
}
return 1;
}
hs205118hs205118 2013-05-24
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呵呵。相当感谢yfqvip啊。花了不少时间帮我解决这个问题。为防止另外有人遇到我同样的问题，说下原因：可能是vfw太老，与硬件方面不兼容，后来直接将 m_bmpinfo.bmiHeader.biWidth = IMAGE_WIDTH; m_bmpinfo.bmiHeader.biHeight = IMAGE_HEIGHT;这样的自己的设置全部给干掉后出现效果了。嘿嘿。
hs205118hs205118 2013-05-23
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顶一顶，求大神帮助啊
hs205118hs205118 2013-05-23
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自己顶一顶，求解释啊。
hs205118hs205118 2013-05-23
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没有CapPicture.h？什么意思呢？
schlafenhamster 2013-05-23
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没有：“"CapPicture.h"” ！！！
满衣兄 2013-05-23
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还没调出来，回家吃饭了
hs205118hs205118 2013-05-23
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yfqvip#163.com
我调试一下看看
不保证能调出来哦[/quote]提示说邮箱格式错误。yfqvip#163.com[/quote]
#改成@啊
@163.com[/quote]收到了吗？？？？找出原因了吗？？？在线等啊。弄出来了就给我个邮件或信息呢。
hs205118hs205118 2013-05-23
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yfqvip#163.com
我调试一下看看
不保证能调出来哦[/quote]yfqvip@163.com?，已经发了，收到否？我的QQ，395004624。要是可以，麻烦加下。
满衣兄 2013-05-23
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yfqvip#163.com
我调试一下看看
不保证能调出来哦[/quote]提示说邮箱格式错误。yfqvip#163.com[/quote]
#改成@啊
@163.com
hs205118hs205118 2013-05-23
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yfqvip#163.com
我调试一下看看
不保证能调出来哦[/quote]提示说邮箱格式错误。yfqvip#163.com
hs205118hs205118 2013-05-23
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yfqvip#163.com
我调试一下看看
不保证能调出来哦[/quote]
在发送，网速真不给力。恩，实在麻烦你了。
满衣兄 2013-05-23
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yfqvip#163.com
我调试一下看看
不保证能调出来哦
hs205118hs205118 2013-05-23
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这个还是和我需要的有点差别，这个是直接预览。我是希望能够通过获取到的数据显示出来。
hs205118hs205118 2013-05-23
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我怎么将代码发给你呢？我用的是vs2008.
Ginie 2013-05-23
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有点看不懂lz的意思，这里有一个简单的win32用VFW预览和录像的代码，lz可以参考下
#include <windows.h>
#include <vfw.h>
#include <commdlg.h>
#include "CapPicture.h"
LRESULT WINAPI MainWndProc( HWND, UINT, WPARAM, LPARAM );
LRESULT WINAPI SelCapDrvProc( HWND, UINT, WPARAM, LPARAM );
int EnumCapDrv();
VOID APIENTRY HandlePopupMenu(HWND, POINT);
DWORD WINAPI videoThreadProc(LPVOID lParam);
HANDLE ghInstance;
HWND hwndMain;
HWND hwndVideo;
HWND hwndSelCapDrvDlg;
HWND hwndSelCapDrvDlg_LBox;
HWND hwndExit;
HWND hwndMin;
HWND hwndHelp;
HWND hwndRecord;
HANDLE hVideoThread;
HRGN hRegion1;
CAPDRIVERCAPS CapDrvCaps;
bool isRecordFileOpen = false;
char recordFile[260];
bool isPicFileOpen = false;
char pictureFile[260];
bool isRecording = false;
bool threadEnd = false;
int PASCAL WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpszCmdLine,
int nCmdShow )
{
WNDCLASS wc;
MSG msg;
if( !hPrevInstance )
{
wc.lpszClassName = "GenericAppClass";
wc.lpfnWndProc = MainWndProc;
wc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = CreateSolidBrush (RGB(196, 200, 204));
wc.lpszMenuName = "GenericAppMenu";
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
RegisterClass( &wc );
}
ghInstance = hInstance;
hwndMain = CreateWindow( "GenericAppClass",
"Super Video",
WS_POPUP,
100,
100,
500,
500,
NULL,
NULL,
hInstance,
NULL
);
ShowWindow( hwndMain, nCmdShow );
SetWindowRgn(hwndMain,hRegion1,1);
while( GetMessage( &msg, NULL, 0, 0 ) ) {
TranslateMessage( &msg );
DispatchMessage( &msg );
}
return msg.wParam;
}
LRESULT CALLBACK MainWndProc( HWND hwndMain, UINT msg, WPARAM wParam,
LPARAM lParam )
{
HDC hDC = GetDC(hwndMain);
RECT rc;
POINT pt;
switch( msg ) {
case WM_LBUTTONDBLCLK:
SetFocus(hwndMain);
break;
case WM_RBUTTONDOWN:
GetClientRect(hwndMain, (LPRECT) &rc);
pt.x = LOWORD(lParam);
pt.y = HIWORD(lParam);
if (PtInRect((LPRECT) &rc, pt))
HandlePopupMenu(hwndMain, pt);
break;
case WM_PAINT:
FrameRgn(hDC,hRegion1,CreateSolidBrush(RGB(0,0,0)),2,2);
BringWindowToTop(hwndSelCapDrvDlg);
return( DefWindowProc( hwndMain, msg, wParam, lParam ));
case WM_COMMAND:
CAPSTATUS CapStatus;
switch( wParam ) {
case SOURCE:
if(CapDrvCaps.fHasDlgVideoSource)
capDlgVideoSource(hwndVideo);
break;
case FORMAT:
if(CapDrvCaps.fHasDlgVideoFormat)
{
capDlgVideoFormat(hwndMain);
capGetStatus(hwndVideo, &CapStatus, sizeof(CAPSTATUS));
SetWindowPos(hwndVideo, NULL, 0, 0, CapStatus.uiImageWidth,
CapStatus.uiImageHeight, SWP_NOZORDER | SWP_NOMOVE);
}
break;
case DISPLAY:
if (CapDrvCaps.fHasDlgVideoDisplay)
capDlgVideoDisplay(hwndVideo);
break;
case EXIT:
SendMessage(hwndMain, WM_SYSCOMMAND, SC_CLOSE, 0);
break;
case MINIMIZE:
SendMessage(hwndMain, WM_SYSCOMMAND, SC_MINIMIZE, 0);
break;
case HELP:
SendMessage(hwndMain, WM_SYSCOMMAND, SC_CONTEXTHELP, 0);
break;
case RECORDVIDEO:
if(HIWORD(wParam) == BN_CLICKED && (HWND) lParam == hwndRecord)
{
if (!isRecordFileOpen)
{
OPENFILENAME ofn;
ZeroMemory(&ofn, sizeof(OPENFILENAME));
ofn.lStructSize = sizeof(OPENFILENAME);
ofn.hwndOwner = hwndMain;
ofn.lpstrFile = recordFile;
ofn.nMaxFile = sizeof(recordFile);
ofn.lpstrFilter = "Video\0*.avi";
ofn.nFilterIndex = 1;
ofn.lpstrFileTitle = NULL;
ofn.nMaxFileTitle = 0;
ofn.lpstrInitialDir = NULL;
ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
if(GetSaveFileName(&ofn) == TRUE)
{
strcpy(recordFile, ofn.lpstrFile);
strcat(recordFile, ".avi");
isRecordFileOpen = true;
DWORD id;
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
hVideoThread = CreateThread(&sa, (ULONG)0,
videoThreadProc, (LPVOID)(ULONG)0, (ULONG)0, &id);
if(hVideoThread == NULL)
MessageBox(NULL, "Creation of Record Thread failed!", "Thread", MB_OK | MB_ICONEXCLAMATION);
break;
}
}
if (isRecordFileOpen)
{
if(isRecording)
{
threadEnd = true;
capFileSaveAs(hwndVideo, recordFile);
SetWindowText(hwndRecord, "Record Video");
isRecording = false;
break;
}
if(!isRecording )
{
int a = 0;
MessageBox(hwndMain, "Do you want to write over the open file?",
"File warning", MB_YESNO | MB_ICONWARNING);
if (a != IDYES)
{
isRecordFileOpen = false;
SendMessage(hwndMain, WM_COMMAND, MAKEWPARAM(RECORDVIDEO, BN_CLICKED), (LPARAM) hwndRecord);
}
if (a == IDYES)
{
capCaptureSequence(hwndVideo);
isRecording = true;
}
break;
}
}
}
break;
}
break;
case WM_CREATE:
RECT helpRect, minRect, exitRect;
HRGN helpRgn, minRgn, exitRgn;
hRegion1 = CreateRoundRectRgn(100,100,500, 500,20,20);
hwndVideo = capCreateCaptureWindow(
(LPSTR) "My Capture Window",
WS_CHILD | WS_VISIBLE,
150, 150, 300, 280,
(HWND) hwndMain,
(int) 1);
hwndExit = CreateWindow (
"button",
"x",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | BS_CENTER | BS_VCENTER,
470, 110, BUTTONSIZE, BUTTONSIZE,
hwndMain,
(HMENU) EXIT,
(HINSTANCE)ghInstance,
(LPVOID)NULL);
hwndMin = CreateWindow (
"button",
"-",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | BS_CENTER | BS_VCENTER,
450, 110, BUTTONSIZE, BUTTONSIZE,
hwndMain,
(HMENU) MINIMIZE,
(HINSTANCE)ghInstance,
(LPVOID)NULL);
hwndHelp = CreateWindow (
"button",
"?",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | BS_CENTER | BS_VCENTER,
430, 110, BUTTONSIZE, BUTTONSIZE,
hwndMain,
(HMENU) HELP,
(HINSTANCE)ghInstance,
(LPVOID)NULL);
hwndRecord = CreateWindow (
"button",
"录像",
WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON | BS_CENTER | BS_VCENTER,
250, 464, 90, 28,
hwndMain,
(HMENU) RECORDVIDEO,
(HINSTANCE)ghInstance,
(LPVOID)NULL);
GetClientRect(hwndHelp, &helpRect);
GetClientRect(hwndMin, &minRect);
GetClientRect(hwndExit, &exitRect);
helpRgn = CreateEllipticRgnIndirect(&helpRect);
minRgn = CreateEllipticRgnIndirect(&minRect);
exitRgn = CreateEllipticRgnIndirect(&exitRect);
SetWindowRgn(hwndExit,exitRgn,1);
SetWindowRgn(hwndMin,minRgn,1);
SetWindowRgn(hwndHelp,helpRgn,1);
hwndSelCapDrvDlg = CreateDialog((HINSTANCE)ghInstance,
MAKEINTRESOURCE( SELCAPDRVDLG ),
0, (DLGPROC)SelCapDrvProc);
hwndSelCapDrvDlg_LBox = GetDlgItem(hwndSelCapDrvDlg,
SELCAPDRVDLG_LSTBOX);
EnumCapDrv();
break;
case WM_DESTROY:
capPreview(hwndVideo, FALSE);
capDriverDisconnect(hwndVideo);
PostQuitMessage( 0 );
break;
default:
return( DefWindowProc( hwndMain, msg, wParam, lParam ));
}
return 0;
}
LRESULT CALLBACK SelCapDrvProc( HWND hWnd, UINT msg,
WPARAM wParam, LPARAM lParam )
{
switch(msg)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
switch ( wParam )
{
case SELCAPDRVDLG_BUTTON:
int sel = 0;
SendMessage( hwndSelCapDrvDlg_LBox, LB_GETSELITEMS, 1, sel);
SendMessage( hwndVideo, WM_CAP_DRIVER_CONNECT, sel, 0L);
SendMessage( hwndSelCapDrvDlg, WM_CLOSE, 0, 0);
SendMessage( hwndVideo, WM_CAP_DRIVER_GET_CAPS,
sizeof(CAPDRIVERCAPS), (LONG) (LPVOID) &CapDrvCaps);
capPreviewRate( hwndVideo, 66 );
capPreview( hwndVideo, TRUE );
}
return TRUE;
case WM_CLOSE:
DestroyWindow(hwndSelCapDrvDlg);
return TRUE;
}
return( 0L );
}
int EnumCapDrv()
{
char szDeviceName[80];
char szDeviceVersion[80];
char item[161];
int i;
for (i=0; i<10; i++)
{
if ( capGetDriverDescription(i, szDeviceName, sizeof(szDeviceName),
szDeviceVersion, sizeof(szDeviceVersion)) )
{
strcpy(item, szDeviceName);
strcat(item, " ");
strcat(item, szDeviceVersion);
SendMessage(hwndSelCapDrvDlg_LBox, LB_ADDSTRING, 0,
(LPARAM) item);
SendMessage(hwndSelCapDrvDlg_LBox, LB_SETITEMDATA, i, (LPARAM) i);
}
}
return 0;
}
VOID APIENTRY HandlePopupMenu(HWND hwnd, POINT pt)
{
HMENU hmenu;
HMENU hmenuTrackPopup;
hmenu = LoadMenu((HINSTANCE)ghInstance, "PopupMenu");
if (hmenu == NULL)
return;
hmenuTrackPopup = GetSubMenu(hmenu, 0);
ClientToScreen(hwnd, (LPPOINT) &pt);
TrackPopupMenu(hmenuTrackPopup, TPM_LEFTALIGN | TPM_LEFTBUTTON,
pt.x, pt.y, 0, hwnd, NULL);
DestroyMenu(hmenu);
}
DWORD WINAPI videoThreadProc(LPVOID lParam)
{
SetWindowText(hwndRecord, "停止");
capCaptureSequence(hwndVideo);
isRecording = true;
while (!threadEnd)
;
MessageBox(NULL, "Leaving Thread", "thread", NULL);
return 0;
}
满衣兄 2013-05-23
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单看这个图像看不出来，代码发我看看
hs205118hs205118 2013-05-23
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自己顶一顶。求大神帮下啊。
