这里是手动捕获和渲染图形的简单方法。
CaptureFilter-> SmartTee->（预览）-> AviDecompressor->渲染
一切正常，工作时可达到140Mb。
停止渲染并释放所有过滤器后，剩下的IGraphBuilder 50Mb！
再次构建相同的过滤器-所有功能都可以使用，但ram中140 + 50 = 190Mb。
释放后剩余100Mb。
一遍又一遍。
我尝试了SmartPtr，ComPtr，Release（）的任何可以想象的组合，但是没有效果。
似乎我做错了什么：（
#include <windows.h>
#include <dshow.h>
#include <iostream>
#include <string>
#pragma comment(lib, "strmiids")
#define SafeRelease(Com) {if (Com!=nullptr){Com->Release(); Com=nullptr;};};
void GetCaptureSource(std::wstring friendly_name, IBaseFilter** ppCaptureFilter);
void GetPin(IPin** ppPin, IBaseFilter* pFilter, std::string direction_str, std::wstring name_wstr = L"");
int main()
{
HRESULT hr = CoInitialize(0);
//Get Capture Filter
IBaseFilter* p_CaptureFilter;
GetCaptureSource(L"USB3.0 Capture Video", &p_CaptureFilter);
//Get Capture Pin
IPin* p_CaptureOutPin;
GetPin(&p_CaptureOutPin, p_CaptureFilter, "out");
//Get Smart Tee Filter
IBaseFilter* p_SmartTee;
hr = CoCreateInstance(CLSID_SmartTee, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&p_SmartTee));
//Get Smart Tee Pins
IPin* p_SmartInputPin;
GetPin(&p_SmartInputPin, p_SmartTee, "in");
IPin* p_SmartOutputPin;
GetPin(&p_SmartOutputPin, p_SmartTee, "out", L"Preview");
//Get AviDecompressorFilter
IBaseFilter* p_AviDecompressor;
hr = CoCreateInstance(CLSID_AVIDec, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&p_AviDecompressor));
//Get Avi Decompressor Pins
IPin* p_AviInputPin;
GetPin(&p_AviInputPin, p_AviDecompressor, "in");
IPin* p_AviOutputPin;
GetPin(&p_AviOutputPin, p_AviDecompressor, "out");
//Get Video Render Filter
IBaseFilter* p_VideoRender;
hr = CoCreateInstance(CLSID_VideoRenderer, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&p_VideoRender));
//Get Video Render Pin
IPin* p_RenderPin;
GetPin(&p_RenderPin, p_VideoRender, "in");
// Create the Filter Graph Manager.
IGraphBuilder* p_GraphBuilder;
hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&p_GraphBuilder);
//Add Capture Filter
hr = p_GraphBuilder->AddFilter(p_CaptureFilter, L"CaptureFilter");
//Add Smart Tee Filter
hr = p_GraphBuilder->AddFilter(p_SmartTee, L"SmartTee");
//Add Decompressor Filter
hr = p_GraphBuilder->AddFilter(p_AviDecompressor, L"Avi Decompressor");
//Add Video Render Filter
hr = p_GraphBuilder->AddFilter(p_VideoRender, L"Video Render");
//Connect Pins
hr = p_GraphBuilder->Connect(p_CaptureOutPin, p_SmartInputPin);
hr = p_GraphBuilder->Connect(p_SmartOutputPin, p_AviInputPin);
hr = p_GraphBuilder->Connect(p_AviOutputPin, p_RenderPin);
//Get Interfaces
IVideoWindow* p_VideoWindow;
hr = p_GraphBuilder->QueryInterface(IID_IVideoWindow, (void **)&p_VideoWindow);
IMediaControl* p_MediaControl;
hr = p_GraphBuilder->QueryInterface(IID_IMediaControl, (void **)&p_MediaControl);
//Release all pins references
SafeRelease(p_CaptureOutPin);
SafeRelease(p_SmartInputPin);
SafeRelease(p_SmartOutputPin);
SafeRelease(p_AviInputPin);
SafeRelease(p_AviOutputPin);
SafeRelease(p_RenderPin);
//Release all filter references
SafeRelease(p_CaptureFilter);
SafeRelease(p_SmartTee);
SafeRelease(p_AviDecompressor);
SafeRelease(p_VideoRender);
std::cout << "Press any key to START\n";
std::system("pause");
hr = p_MediaControl->Run();
p_VideoWindow->put_Caption(L"render_window");
p_VideoWindow->SetWindowPosition(20, 20, 1920, 1080);
LONG lStyle = GetWindowLong(0, GWL_STYLE);
lStyle &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU);
p_VideoWindow->put_WindowStyle(lStyle);
//There Window apears and ALL GOOD
std::cout << "Press any key to STOP\n";
std::system("pause");
hr = p_MediaControl->Stop();
hr = p_VideoWindow->put_Visible(OAFALSE);
hr = p_VideoWindow->put_Owner(NULL);
//SafeRelease(p_MediaControl);
//SafeRelease(p_VideoWindow);
SafeRelease(p_GraphBuilder);
CoUninitialize();
std::cout << "Press any key to QUIT\n";
std::system("pause");
std::cout << "\n\n";
//system("pause");
return 0;
}
void GetCaptureSource(std::wstring friendly_name, IBaseFilter** ppCaptureFilter) {
HRESULT hr;
ICreateDevEnum* devs;
hr = CoCreateInstance(CLSID_SystemDeviceEnum, 0, CLSCTX_INPROC, IID_ICreateDevEnum, (void **)&devs);
IEnumMoniker* p_InputMonikersEnum;
hr = devs->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &p_InputMonikersEnum, 0);
SafeRelease(devs);
bool is_capture_finded = false;
do {
IMoniker* p_CaptureMoniker;
hr = p_InputMonikersEnum->Next(1, &p_CaptureMoniker, 0);
if (hr != S_OK) break;
IPropertyBag* p_PropBag;
hr = p_CaptureMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void**)&p_PropBag);
VARIANT var;
VariantInit(&var);
VariantClear(&var);
hr = p_PropBag->Read(L"FriendlyName", &var, 0);
SafeRelease(p_PropBag);
std::wstring input_moniker_friendly_name = std::wstring(var.bstrVal);
if (input_moniker_friendly_name == friendly_name) {
is_capture_finded = true;
hr = p_CaptureMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)ppCaptureFilter);
SafeRelease(p_CaptureMoniker);
break;
}
SafeRelease(p_CaptureMoniker);
} while (true);
if (is_capture_finded == false) MessageBoxW(0, L"Capture NOT founded.", L"ERROR", MB_OK);
SafeRelease(p_InputMonikersEnum);
return;
}
void GetPin(IPin** ppPin, IBaseFilter* pFilter, std::string direction_str, std::wstring name_wstr) {
HRESULT hr;
IEnumPins* pEnumPins;
hr = pFilter->EnumPins(&pEnumPins);
do {
IPin* pNextPin;
hr = pEnumPins->Next(1, &pNextPin, 0);
if (hr != S_OK) break;
PIN_INFO pin_inf;
hr = pNextPin->QueryPinInfo(&pin_inf);
bool is_pin_of_interest = true;
if ((direction_str == "in") && (pin_inf.dir == PINDIR_OUTPUT)) is_pin_of_interest = false;
if ((direction_str == "out") && (pin_inf.dir == PINDIR_INPUT)) is_pin_of_interest = false;
if ((name_wstr != L"") && (name_wstr != std::wstring(pin_inf.achName))) is_pin_of_interest = false;
if (is_pin_of_interest) {
*ppPin = pNextPin;
SafeRelease(pNextPin);
break;
}
SafeRelease(pNextPin);
} while (true);
SafeRelease(pEnumPins);
return;
}
答案 0 :(得分：1)
那是工作代码
1.您应该仅使用您创建的所有I *实例，而不能只使用IPIns
2.看代码，还有一些细微差别
#include <windows.h>
#include <dshow.h>
#include <iostream>
#include <string>
#pragma comment(lib, "strmiids")
#define SafeRelease(Com) {if (Com!=nullptr){Com->Release(); Com=nullptr;};};
void GetCaptureSource(std::wstring friendly_name, IBaseFilter** ppCaptureFilter);
void GetPin(IPin** ppPin, IBaseFilter* pFilter, std::string direction_str, std::wstring name_wstr = L"");
int main()
{
HRESULT hr = CoInitialize(0);
//Get Capture Filter
IBaseFilter* p_CaptureFilter;
GetCaptureSource(L"USB3.0 Capture Video", &p_CaptureFilter);
//Get Capture Pin
IPin* p_CaptureOutPin;
GetPin(&p_CaptureOutPin, p_CaptureFilter, "out");
//Get Smart Tee Filter
IBaseFilter* p_SmartTee;
hr = CoCreateInstance(CLSID_SmartTee, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&p_SmartTee));
//Get Smart Tee Pins
IPin* p_SmartInputPin;
GetPin(&p_SmartInputPin, p_SmartTee, "in");
IPin* p_SmartOutputPin;
GetPin(&p_SmartOutputPin, p_SmartTee, "out", L"Preview");
//Get AviDecompressorFilter
IBaseFilter* p_AviDecompressor;
hr = CoCreateInstance(CLSID_AVIDec, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&p_AviDecompressor));
//Get Avi Decompressor Pins
IPin* p_AviInputPin;
GetPin(&p_AviInputPin, p_AviDecompressor, "in");
IPin* p_AviOutputPin;
GetPin(&p_AviOutputPin, p_AviDecompressor, "out");
//Get Video Render Filter
IBaseFilter* p_VideoRender;
hr = CoCreateInstance(CLSID_VideoRenderer, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&p_VideoRender));
//Get Video Render Pin
IPin* p_RenderPin;
GetPin(&p_RenderPin, p_VideoRender, "in");
// Create the Filter Graph Manager.
IGraphBuilder* p_GraphBuilder;
hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&p_GraphBuilder);
//Add Capture Filter
hr = p_GraphBuilder->AddFilter(p_CaptureFilter, L"CaptureFilter");
//Add Smart Tee Filter
hr = p_GraphBuilder->AddFilter(p_SmartTee, L"SmartTee");
//Add Decompressor Filter
hr = p_GraphBuilder->AddFilter(p_AviDecompressor, L"Avi Decompressor");
//Add Video Render Filter
hr = p_GraphBuilder->AddFilter(p_VideoRender, L"Video Render");
//Connect Pins
hr = p_GraphBuilder->Connect(p_CaptureOutPin, p_SmartInputPin);
hr = p_GraphBuilder->Connect(p_SmartOutputPin, p_AviInputPin);
hr = p_GraphBuilder->Connect(p_AviOutputPin, p_RenderPin);
//Get Interfaces
IVideoWindow* p_VideoWindow;
hr = p_GraphBuilder->QueryInterface(IID_IVideoWindow, (void **)&p_VideoWindow);
IMediaControl* p_MediaControl;
hr = p_GraphBuilder->QueryInterface(IID_IMediaControl, (void **)&p_MediaControl);
//DONT RELEASE IPINS REFERENSES!!!!!!!!
//IT CAUSE ERROR WHEN YOU TRY TO RELEASE FILTERS OR GRAPH WERY LATER
//AND WILL BE WERY HARD TO FIND IT
//p_CaptureOutPin->Release();
//p_SmartInputPin->Release();
//p_SmartOutputPin->Release();
//p_AviInputPin->Release();
//p_AviOutputPin->Release();
//p_RenderPin->Release();
//Release all filter references
p_CaptureFilter->Release();
p_SmartTee->Release();
p_AviDecompressor->Release();
p_VideoRender->Release();
std::cout << "Press any key to START\n";
std::system("pause");
hr = p_MediaControl->Run();
p_VideoWindow->put_Caption(L"render_window");
p_VideoWindow->SetWindowPosition(20, 20, 1920, 1080);
LONG lStyle = GetWindowLong(0, GWL_STYLE);
lStyle &= ~(WS_CAPTION | WS_THICKFRAME | WS_MINIMIZE | WS_MAXIMIZE | WS_SYSMENU);
p_VideoWindow->put_WindowStyle(lStyle);
//There Window apears and ALL GOOD
std::cout << "Press any key to STOP\n";
std::system("pause");
hr = p_MediaControl->Stop();
hr = p_VideoWindow->put_Visible(OAFALSE);
hr = p_VideoWindow->put_Owner(NULL);
// Enumerate the filters in the graph.
IEnumFilters *pEnum = NULL;
hr = p_GraphBuilder->EnumFilters(&pEnum);
do {
IBaseFilter *pFilter = NULL;
hr = pEnum->Next(1, &pFilter, NULL);
if (hr != S_OK) break;
// Remove the filter.
p_GraphBuilder->RemoveFilter(pFilter);
// RESET THE ENUMERATOR IN CYCLE (WERY STRANGE CODE BUT ELSEWERE NOTHING WORKS)
pEnum->Reset();
pFilter->Release();
} while (true);
pEnum->Release();
std::cout << "Press any key to QUIT\n";
std::system("pause");
std::cout << "\n\n";
//system("pause");
return 0;
}
void GetCaptureSource(std::wstring friendly_name, IBaseFilter** ppCaptureFilter) {
HRESULT hr;
ICreateDevEnum* devs;
hr = CoCreateInstance(CLSID_SystemDeviceEnum, 0, CLSCTX_INPROC, IID_ICreateDevEnum, (void **)&devs);
IEnumMoniker* p_InputMonikersEnum;
hr = devs->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &p_InputMonikersEnum, 0);
SafeRelease(devs);
bool is_capture_finded = false;
do {
IMoniker* p_CaptureMoniker;
hr = p_InputMonikersEnum->Next(1, &p_CaptureMoniker, 0);
if (hr != S_OK) break;
IPropertyBag* p_PropBag;
hr = p_CaptureMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void**)&p_PropBag);
VARIANT var;
VariantInit(&var);
VariantClear(&var);
hr = p_PropBag->Read(L"FriendlyName", &var, 0);
SafeRelease(p_PropBag);
std::wstring input_moniker_friendly_name = std::wstring(var.bstrVal);
if (input_moniker_friendly_name == friendly_name) {
is_capture_finded = true;
hr = p_CaptureMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)ppCaptureFilter);
SafeRelease(p_CaptureMoniker);
break;
}
SafeRelease(p_CaptureMoniker);
} while (true);
if (is_capture_finded == false) MessageBoxW(0, L"Capture NOT founded.", L"ERROR", MB_OK);
SafeRelease(p_InputMonikersEnum);
return;
}
void GetPin(IPin** ppPin, IBaseFilter* pFilter, std::string direction_str, std::wstring name_wstr) {
HRESULT hr;
IEnumPins* pEnumPins;
hr = pFilter->EnumPins(&pEnumPins);
do {
IPin* pNextPin;
hr = pEnumPins->Next(1, &pNextPin, 0);
if (hr != S_OK) break;
PIN_INFO pin_inf;
hr = pNextPin->QueryPinInfo(&pin_inf);
bool is_pin_of_interest = true;
if ((direction_str == "in") && (pin_inf.dir == PINDIR_OUTPUT)) is_pin_of_interest = false;
if ((direction_str == "out") && (pin_inf.dir == PINDIR_INPUT)) is_pin_of_interest = false;
if ((name_wstr != L"") && (name_wstr != std::wstring(pin_inf.achName))) is_pin_of_interest = false;
pin_inf.pFilter->Release();
if (is_pin_of_interest) {
*ppPin = pNextPin;
SafeRelease(pNextPin);
break;
}
SafeRelease(pNextPin);
} while (true);
SafeRelease(pEnumPins);
return;
}