Question

我在使用EVR（增强型视频渲染器）的相机应用程序中遇到重要的内存泄漏。当我多次准备，运行，停止和取消准备图表时（每个周期几MB，具体取决于视频分辨率），就会发生泄漏。

我尽可能地简化了代码;你可以在这里下载： https://daptech.box.com/s/6csm91vhcawiw18u42kq

该图表具有视频捕获过滤器，SampleGrabber过滤器和渲染器。连接时，它会创建一个AVI Decompressor过滤器来完成图形。

以下是一些摘录......

声明：

CComPtr<IGraphBuilder> pGraphBuilder;
CComPtr<IBaseFilter>   pSource;                         // The capture device filter
CComPtr<IBaseFilter>   pSampleGrabberFilter;            // Filter to capture data that flows through the graph
CComPtr<IBaseFilter>   pRenderer;                       // EVR

图表准备（删除验证）：

hr = m_p->pGraphBuilder.CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC);

hr = m_p->pSampleGrabberFilter.CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC);

CComQIPtr<ISampleGrabber, &IID_ISampleGrabber> pSampleGrabber(m_p->pSampleGrabberFilter);
hr = pSampleGrabber->SetBufferSamples(FALSE);      // Don't copy image data for better performances

// Setup the callback
hr = pSampleGrabber->SetCallback(&m_p->cb, 1);         // 0: SampleCB() is called, so that we directly access the buffer.  1: BufferCB() is called.  The doc states that the function always makes a copy of the data.

CComPtr<IPin> pSampleGrabberInputPin( FindPin(m_p->pSampleGrabberFilter, PINDIR_INPUT, NULL) );
CComPtr<IPin> pSampleGrabberOutputPin( FindPin(m_p->pSampleGrabberFilter, PINDIR_OUTPUT, NULL) );

hr = m_p->pGraphBuilder->AddFilter(m_p->pSampleGrabberFilter, L"SampleGrabber");

hr = FindVideoCaptureDevice(m_p->pSource, (unsigned)iCameraIndex);

CComPtr<IPin> pSourceOutputPin( FindPin(m_p->pSource, PINDIR_OUTPUT, L"CAPTURE") );

hr = m_p->pGraphBuilder->AddFilter(m_p->pSource, L"Camera");

hr = m_p->pRenderer.CoCreateInstance(CLSID_EnhancedVideoRenderer, NULL, CLSCTX_INPROC);

hr = m_p->pGraphBuilder->AddFilter(m_p->pRenderer, L"Renderer");

hr = ConfigEVR(m_p->pRenderer, m_staticPreview.m_hWnd, uWidth, uHeight);

CComPtr<IPin> pRendererInputPin( FindPin(m_p->pRenderer, PINDIR_INPUT, NULL) );

// Now select the format:
if (!SelectFormat(pSourceOutputPin, uWidth, uHeight, bCompression))
{ MessageBox(L"No appropriate format found.\n"); return; }

// Connection:
hr = m_p->pGraphBuilder->Connect(pSourceOutputPin, pSampleGrabberInputPin);
hr = m_p->pGraphBuilder->Connect(pSampleGrabberOutputPin, pRendererInputPin);

此功能被调用到＆＃34;无准备＆＃34;图表：

void FreeDirectShowGraph()
{
    if (pSource) DisconnectDownstream(pSource);
    RemoveAndRelease(pRenderer);
    RemoveAndRelease(pSampleGrabberFilter);
    RemoveAndRelease(pSource);
    if (pGraphBuilder) pGraphBuilder.Release();
}

任何线索都将不胜感激！

DirectShow内存泄漏

0 个答案: