问题描述
亲爱的
我想制作一个用于从网络摄像头捕获图像的应用程序，然后捕获视频5到10秒钟.我已经下载了DirectShow示例(CaptureNET和SampleGrabberNET)，但无法将其加入1个示例中.
I want make an application for capturing image from webcam, after that capturing video for 5 or 10 seconds. I've download sample DirectShow (CaptureNET and SampleGrabberNET) but I can't join that into 1 sample.
实际上，我已经使用sourceforge.net的一些示例进行了合并，但是它仅适用于第一次图像捕获和第一次视频捕获，当我尝试再次捕获或抓取时，它会显示错误.
Actually I've made combine using some samples from sourceforge.net, but it only works for 1st image capture and 1st video capture, when I tried to capture or grab again, it shows an error.
有人做到了吗?
推荐答案
IPin * smart_outcappin;
IPin * base_capturepin;
IPin * base_previewpin;
IPin * smart_inpin;
IPin * smart_outprewpin;
IPin * b_cfillOutc;
IPin * PgrabIn;
IPin * PgrabOut;
IPin * PRenderIn;
IPin * pin;
HWND hwnd;
hwnd =(HWND)hand;
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2，NULL，CLSCTX_INPROC，IID_ICaptureGraphBuilder2，(void **)&capturebuilder);
hr = CoCreateInstance(CLSID_FilterGraph，NULL，CLSCTX_INPROC，IID_IGraphBuilder，(void **)& graphbuilder);
hr = graphbuilder-> QueryInterface(IID_IVideoWindow，(void **)& videowindow);
hr = graphbuilder-> QueryInterface(IID_IMediaControl，(void **)& mediacontrol);
hr = CoCreateInstance(CLSID_SystemDeviceEnum，NULL，CLSCTX_INPROC，IID_ICreateDevEnum，(void **)&devenum);
hr = devenum-> CreateClassEnumerator(CLSID_VideoInputDeviceCategory，& enummoniker，NULL);
hr = capturebuilder-> SetFiltergraph(graphbuilder);
hr = CoCreateInstance(CLSID_SmartTee，NULL，CLSCTX_INPROC，IID_IBaseFilter，(void **)& smartteefilter);
变量var;
CComBSTR str = NULL;
while(enummoniker-> Next(1，& mon，& l)== S_OK)
{
VariantInit(& var);
mon-> BindToStorage(0,0，IID_IPropertyBag，(void **)& bag);
bag-> Read(L"Friendlyname"，& var，0);
str = SysAllocString(var.bstrVal);
if(str ==设备名称)
{
hr = mon-> BindToObject(0,0，IID_IBaseFilter，(void **)& basefilter);
休息；
}
}
CComPtr< IEnumPins> enumpin;
hr = basefilter-> EnumPins(& enumpin);
ULONG ul;
while(enumpin-> Next(1，& pin，& ul)== S_OK)
{
PIN_INFO pininfo;
pindir =(PIN_DIRECTION)2;
pin-> QueryDirection(& pindir);
pin-> QueryPinInfo(& pininfo);
pintyp = SysAllocString(pininfo.achName);
if(pintyp == pintype)
{
休息；
}
其他
{
继续;
}
}
hr = graphbuilder-> AddFilter(basefilter，L"videoname");
hr = graphbuilder-> AddFilter(smartteefilter，L"smart");
AM_MEDIA_TYPE * fmt;
hr = pin-> QueryInterface(IID_IAMStreamConfig，(void **)& streamconfig);
VIDEO_STREAM_CONFIG_CAPS上限；
int sz， max_res;
hr = streamconfig-> GetNumberOfCapabilities(& max_res，& sz);
if(str == L"WCSA400 Video 0&")
{
hr = streamconfig-> GetStreamCaps(2，& fmt，(BYTE *)& caps);
}
否则if(str == L"Logitech QuickCam Easy/Cool")
{
hr = streamconfig-> GetStreamCaps(4，& fmt，(BYTE *)& caps);
}
hr = streamconfig-> SetFormat(fmt);
if(str =="WCSA400视频0")
{
if(pintyp == L捕获")
{
hr = CoCreateInstance(CLSID_SampleGrabber，NULL，CLSCTX_INPROC，IID_ISampleGrabber，(void **)& SG);
CComQIPtr< IBaseFilter，& IID_IBaseFilter> PGrabase(SG);
hr = graphbuilder-> AddFilter(PGrabase，L"SAMPLE");
CComPtr< IBaseFilter> pRender;
hr = CoCreateInstance(CLSID_NullRenderer，NULL，CLSCTX_INPROC，IID_IBaseFilter，(void **)& pRender);
hr = graphbuilder-> AddFilter(pRender，L"NULL");
hr = GetPin(basefilter，PINDIR_OUTPUT，0，& base_capturepin);
hr = GetPin(PGrabase，PINDIR_INPUT，0，& PgrabIn);
hr = graphbuilder-> Connect(base_capturepin，PgrabIn);
hr = GetPin(PGrabase，PINDIR_OUTPUT，1，& PgrabOut);
hr = GetPin(pRender，PINDIR_INPUT，0，& PRenderIn);
AM_MEDIA_TYPE mt;
hr = SG-> GetConnectedMediaType(& mt); //设置抓取程序的媒体类型以生成流.
VIDEOINFOHEADER * vih =(VIDEOINFOHEADER *)mt.pbFormat; //设置宽度& BMP文件缓冲区的高度.
Grp_Obj.lWidth = vih-> bmiHeader.biWidth;
Grp_Obj.lHeight = vih-> bmiHeader.biHeight;
hr = SG-> SetBufferSamples(FALSE);
hr = SG-> SetOneShot(FALSE);
hr = SG-> SetCallback(& Grp_Obj，1);
}
否则if(pintyp == L预览")
{
hr = capturebuilder-> RenderStream(& PIN_CATEGORY_PREVIEW，& MEDIATYPE_Video，basefilter，NULL，NULL);
}
}
devenum-> Release();
basefilter-> Release();
enummoniker-> Release();
mon-> Release();
bag-> Release();
hr = videowindow-> put_Owner((OAHWND)hwnd);
hr = videowindow-> put_WindowStyle(WS_CLIPCHILDREN);
hr = videowindow-> put_Visible(OATRUE);
RECT记录；
GetClientRect(hwnd，& rec);
videowindow-> SetWindowPosition(0,0，rec.right，rec.bottom);
hr = mediacontrol-> Run();
GetPin(IBaseFilter * pFilter，需要输入PIN_DIRECTION，int iNum，IPin ** ppPin)
{
CComPtr< IEnumPins> pEnum;
* ppPin = NULL;
HRESULT hr = pFilter-> EnumPins(& pEnum);
if(FAILED(hr))
返回hr;
ULONG ulFound;
IPin * pPin;
hr = E_FAIL;
while(S_OK == pEnum-> Next(1，& pPin，& ulFound))
{
PIN_DIRECTION pindir =(PIN_DIRECTION)3;
pPin-> QueryDirection(& pindir);
if(pindir ==必填)
{
if(iNum == 0)
{
* ppPin = pPin;
//找到了请求的引脚，所以清除错误
hr = S_OK;
休息；
}
iNum--;
}
pPin-> Release();
}
返回hr;
IPin* smart_outcappin;
IPin* base_capturepin;
IPin* base_previewpin;
IPin* smart_inpin;
IPin* smart_outprewpin;
IPin * b_cfillOutc;
IPin * PgrabIn;
IPin * PgrabOut;
IPin * PRenderIn;
IPin *pin;
HWND hwnd;
hwnd=(HWND)hand;
hr=CoCreateInstance(CLSID_CaptureGraphBuilder2,NULL,CLSCTX_INPROC,IID_ICaptureGraphBuilder2,(void**)&capturebuilder);
hr=CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC,IID_IGraphBuilder,(void**)&graphbuilder);
hr=graphbuilder->QueryInterface(IID_IVideoWindow,(void**)&videowindow);
hr=graphbuilder->QueryInterface(IID_IMediaControl,(void**)&mediacontrol);
hr=CoCreateInstance(CLSID_SystemDeviceEnum,NULL,CLSCTX_INPROC,IID_ICreateDevEnum,(void**)&devenum);
hr=devenum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&enummoniker,NULL);
hr=capturebuilder->SetFiltergraph(graphbuilder);
hr=CoCreateInstance(CLSID_SmartTee,NULL,CLSCTX_INPROC,IID_IBaseFilter,(void**)&smartteefilter);
VARIANT var;
CComBSTR str=NULL;
while(enummoniker->Next(1,&mon,&l)==S_OK)
{
VariantInit(&var);
mon->BindToStorage(0,0,IID_IPropertyBag,(void**)&bag);
bag->Read(L"Friendlyname",&var,0);
str=SysAllocString(var.bstrVal);
if(str==devicename)
{
hr=mon->BindToObject(0,0,IID_IBaseFilter,(void**)&basefilter);
break;
}
}
CComPtr < IEnumPins > enumpin;
hr=basefilter->EnumPins(&enumpin);
ULONG ul;
while(enumpin->Next(1,&pin,&ul)==S_OK)
{
PIN_INFO pininfo;
pindir=(PIN_DIRECTION)2;
pin->QueryDirection(&pindir);
pin->QueryPinInfo(&pininfo);
pintyp=SysAllocString(pininfo.achName);
if(pintyp==pintype)
{
break;
}
else
{
continue;
}
}
hr=graphbuilder->AddFilter(basefilter,L"videoname");
hr=graphbuilder->AddFilter(smartteefilter,L"smart");
AM_MEDIA_TYPE* fmt;
hr=pin->QueryInterface(IID_IAMStreamConfig,(void**)&streamconfig);
VIDEO_STREAM_CONFIG_CAPS caps;
int sz, max_res;
hr=streamconfig->GetNumberOfCapabilities(&max_res,&sz);
if(str==L"WCSA400 Video 0")
{
hr =streamconfig->GetStreamCaps(2,&fmt,(BYTE*)&caps);
}
else if(str==L"Logitech QuickCam Easy/Cool")
{
hr =streamconfig->GetStreamCaps(4,&fmt,(BYTE*)&caps);
}
hr=streamconfig->SetFormat(fmt);
if(str=="WCSA400 Video 0")
{
if(pintyp==L"Capture")
{
hr=CoCreateInstance(CLSID_SampleGrabber,NULL,CLSCTX_INPROC,IID_ISampleGrabber,(void**)&SG);
CComQIPtr<IBaseFilter,&IID_IBaseFilter>PGrabase(SG);
hr=graphbuilder->AddFilter(PGrabase,L"SAMPLE");
CComPtr<IBaseFilter> pRender;
hr=CoCreateInstance(CLSID_NullRenderer,NULL,CLSCTX_INPROC,IID_IBaseFilter,(void**)&pRender);
hr=graphbuilder->AddFilter(pRender,L"NULL");
hr=GetPin(basefilter,PINDIR_OUTPUT,0,&base_capturepin);
hr=GetPin(PGrabase,PINDIR_INPUT,0,&PgrabIn);
hr=graphbuilder->Connect(base_capturepin,PgrabIn);
hr=GetPin(PGrabase,PINDIR_OUTPUT,1,&PgrabOut);
hr=GetPin(pRender,PINDIR_INPUT,0,&PRenderIn);
AM_MEDIA_TYPE mt;
hr = SG->GetConnectedMediaType(&mt); //Set mediatype for grabber to make stream.
VIDEOINFOHEADER * vih = (VIDEOINFOHEADER*) mt.pbFormat; //Set width & Height of BMP File buffer.
Grp_Obj.lWidth = vih->bmiHeader.biWidth;
Grp_Obj.lHeight = vih->bmiHeader.biHeight;
hr = SG->SetBufferSamples(FALSE);
hr = SG->SetOneShot(FALSE);
hr = SG->SetCallback(&Grp_Obj,1);
}
else if(pintyp==L"Preview")
{
hr=capturebuilder->RenderStream(&PIN_CATEGORY_PREVIEW,&MEDIATYPE_Video,basefilter,NULL,NULL);
}
}
devenum->Release();
basefilter->Release();
enummoniker->Release();
mon->Release();
bag->Release();
hr=videowindow->put_Owner((OAHWND)hwnd);
hr=videowindow->put_WindowStyle(WS_CLIPCHILDREN);
hr=videowindow->put_Visible(OATRUE);
RECT rec;
GetClientRect(hwnd,&rec);
videowindow->SetWindowPosition(0,0,rec.right,rec.bottom);
hr = mediacontrol->Run();
GetPin(IBaseFilter * pFilter,PIN_DIRECTION dirrequired,int iNum, IPin **ppPin)
{
CComPtr< IEnumPins > pEnum;
*ppPin = NULL;
HRESULT hr = pFilter->EnumPins(&pEnum);
if(FAILED(hr))
return hr;
ULONG ulFound;
IPin *pPin;
hr = E_FAIL;
while(S_OK == pEnum->Next(1, &pPin, &ulFound))
{
PIN_DIRECTION pindir = (PIN_DIRECTION)3;
pPin->QueryDirection(&pindir);
if(pindir == dirrequired)
{
if(iNum == 0)
{
*ppPin = pPin;
// Found requested pin, so clear error
hr = S_OK;
break;
}
iNum--;
}
pPin->Release();
}
return hr;
这篇关于一起捕获视频和图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！