directshow - Deadlocked on IGraphbuilder->connect () -


so calling out expert in windows direct show:

i trying run multiple cameras on single computer our test application , getting intermittent deadlocks in relation directshow. recent deadlock hitting in igraphbuilder connect function.

i first add filter want add, 2 pins want connect , when call connect, app go deadlock.

in code below m_graphbuilder igraphbuilder object.

here code:

hresult uvccamera::setupframegrabfilter() {      hresult hr = s_ok;     cunknown* unknown = framegrabber::createinstance(null, &hr);     _assert(succeeded(hr));    _assert(unknown);     if (failed(hr))       return hr;     hr = unknown->nondelegatingqueryinterface(iid_ibasefilter, (void**)&m_framegrabber);    assert(succeeded(hr));     hr = m_graphbuilder->addfilter(m_framegrabber, text("frame grabber filter"));    assert(succeeded(hr));    if (failed(hr))       return hr;    stopcapture();     // output pin , input pin   ccomptr<ipin> sourcepin;   ccomptr<ipin> dumppin;    // filter correpsonding capture device can connect camera grabber   utility::getpin(m_uvcextension.getcapturefilter(), pindir_output, 0, &sourcepin);   utility::getpin(m_framegrabber, pindir_input, 0, &dumppin);    // connect filters (returns vfw_e_cannot_connect if not starting in disconnected state)    **return m_graphbuilder->connect(sourcepin, dumppin);**** deadlock source <----- not return**

}

here callstack:

ntdll.dll!_zwcreatefile@44()  + 0x12 bytes   ntdll.dll!_zwcreatefile@44()  + 0x12 bytes   ole32.dll!cretailmalloc_alloc(imalloc * pthis, unsigned long cb)  line 641  c++ ksproxy.ax!createpinhandle()  + 0x70 bytes   ksproxy.ax!cksoutputpin::processcompleteconnect()  + 0x14e bytes     ksproxy.ax!cksoutputpin::completeconnect()  + 0x12 bytes     ksproxy.ax!cbasepin::attemptconnection()  + 0x62 bytes   ksproxy.ax!cbasepin::trymediatypes()  + 0x68 bytes   ksproxy.ax!cbasepin::agreemediatype()  + 0x73 bytes  ksproxy.ax!cbasepin::connect()  + 0x64 bytes     ksproxy.ax!cksoutputpin::connect()  + 0x17d bytes    quartz.dll!cfiltergraph::connectdirectinternal()  + 0x83 bytes   quartz.dll!cfiltergraph::connectbyfindingpin()  + 0x71 bytes     quartz.dll!cfiltergraph::connectusingfilter()  + 0x72 bytes  quartz.dll!cfiltergraph::connectviaintermediate()  + 0x113 bytes     quartz.dll!cfiltergraph::connectrecursively()  + 0x78 bytes  quartz.dll!cfiltergraph::connectinternal()  + 0xde bytes     **quartz.dll!cfiltergraph::connect()  + 0x17 bytes** ---< called directshow     cam.dll!uvccamera::setupframegrabfilter()  line 827 + 0x16 bytes    c++ cam.dll!uvccamera::setupcapture(const std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > & deviceinstanceid)  line 305 + 0x7 bytes   c++ cam.dll!uvccamera::initialize(const std::basic_string<wchar_t,std::char_traits<wchar_t>,std::allocator<wchar_t> > & deviceinstanceid, int timeout, int flags)  line 113 + 0xa bytes c++ cam.dll!`anonymous namespace'::createcamera(unsigned int & hcamera, int timeout, int flags)  line 252 + 0x13 bytes  c++ cam.dll!`anonymous namespace'::corethreadfunc(void * data)  line 912 + 0x17 bytes   c++ kernel32.dll!@basethreadinitthunk@12()  + 0x12 bytes     ntdll.dll!___rtluserthreadstart@8()  + 0x27 bytes    ntdll.dll!__rtluserthreadstart@8()  + 0x1b bytes

what can prevent deadlock?


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