TSampleGrabber的使用方式? |
尚未結案
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alnetkane
一般會員 發表:1 回覆:1 積分:0 註冊:2003-01-03 發送簡訊給我 |
請問各位前輩,小弟已經有用DSPACK顯示電視卡AV信號攝影機影像,我有試著用
TSampleGrabber去抓圖,抓圖出來都是0Kb.請問我的問題出在那麼呢?
謝謝回答~~
void __fastcall TForm2::FormShow(TObject *Sender) { FilterGraph->ClearGraph(); FilterGraph->Active = false; Filter->BaseFilter->Moniker = Form1->SysDev->GetMoniker(Form1->ListBox1->ItemIndex); FilterGraph->Active = true; CheckDSError(FilterGraph->QueryInterface(IID_ICaptureGraphBuilder2, &Graph)); CheckDSError(VideoWindow->QueryInterface(IID_IBaseFilter, &VideoFilter)); CheckDSError(Filter->QueryInterface(IID_IBaseFilter, &SourceFilter)); HRESULT hr; hr = Graph->FindInterface(&LOOK_UPSTREAM_ONLY, NULL, SourceFilter, IID_IAMCrossbar, (void**)&pXBar1); if (SUCCEEDED(hr)) { pXBar1->Route(0,1); pXBar1->Release(); } Graph->RenderStream(&PIN_CATEGORY_CAPTURE, NULL, SourceFilter, NULL, VideoFilter); FilterGraph->Play(); Graph->Release(); VideoFilter->Release(); SourceFilter->Release(); } void __fastcall TForm2::VideoWindowClick(TObject *Sender) { FilterGraph->Stop(); PinList = new TPinList(SourceFilter); for(int i = 0; i<=PinList->Count-1;i ) { if (PinList->Connected[i]) ShowPinPropertyPage((unsigned int)this->Handle, PinList->Items[i]); } FilterGraph->Play(); } //--------------------------------------------------------------------------- void __fastcall TForm2::Button1Click(TObject *Sender) { pBitmap = new Graphics::TBitmap(); SampleGrabber->GetBitmap(pBitmap); pBitmap->SaveToFile("c:\\test.bmp"); delete pBitmap; } |
bearmaster
一般會員 發表:36 回覆:45 積分:16 註冊:2004-05-27 發送簡訊給我 |
試試看唄:
IBaseFilter *CaptureFilter=NULL; : : CheckDSError(VideoWindow->QueryInterface(IID_IBaseFilter, &VideoFilter)); CheckDSError(SampleGrabber1->QueryInterface(IID_IBaseFilter, &CaptureFilter)); // 加入這行 CheckDSError(Filter->QueryInterface(IID_IBaseFilter, &SourceFilter)); : : Graph->RenderStream(&PIN_CATEGORY_CAPTURE, NULL, SourceFilter, NULL, VideoFilter); Graph->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, SourceFilter, NULL, CaptureFilter);//加入這行 : : |
alnetkane
一般會員 發表:1 回覆:1 積分:0 註冊:2003-01-03 發送簡訊給我 |
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