Directshow捕获到文件,没有任何反应
Directshow capture to file, nothing happens
我正在尝试按照 windows 开发中心上的 DirectShow 示例来制作我自己的可以将屏幕和音频捕获到视频的应用程序:Capturing Video to an AVI File
所有代码都正常,但没有任何反应,avi 文件没有出现。网络摄像头已连接,我可以使用 AMCap 看到流。在代码中,凸轮以正确的文件名出现。 windows SDK已安装,我的平台是win7 x64。
我的代码:
#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <dshow.h>
#pragma comment(lib, "strmiids")
HRESULT EnumerateDevices(REFGUID category, IEnumMoniker **ppEnum)
{
// Create the System Device Enumerator.
ICreateDevEnum *pDevEnum;
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL,
CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pDevEnum));
if (SUCCEEDED(hr))
{
// Create an enumerator for the category.
hr = pDevEnum->CreateClassEnumerator(category, ppEnum, 0);
if (hr == S_FALSE)
{
hr = VFW_E_NOT_FOUND; // The category is empty. Treat as an error.
}
pDevEnum->Release();
}
return hr;
}
HRESULT InitCaptureGraphBuilder(
IGraphBuilder **ppGraph, // Receives the pointer.
ICaptureGraphBuilder2 **ppBuild // Receives the pointer.
)
{
if (!ppGraph || !ppBuild)
{
return E_POINTER;
}
IGraphBuilder *pGraph = NULL;
ICaptureGraphBuilder2 *pBuild = NULL;
// Create the Capture Graph Builder.
HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL,
CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild);
if (SUCCEEDED(hr))
{
// Create the Filter Graph Manager.
hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void**)&pGraph);
if (SUCCEEDED(hr))
{
// Initialize the Capture Graph Builder.
pBuild->SetFiltergraph(pGraph);
// Return both interface pointers to the caller.
*ppBuild = pBuild;
*ppGraph = pGraph; // The caller must release both interfaces.
return S_OK;
}
else
{
pBuild->Release();
}
}
return hr; // Failed
}
void DisplayDeviceInformation(IEnumMoniker *pEnum)
{
IMoniker *pMoniker = NULL;
while (pEnum->Next(1, &pMoniker, NULL) == S_OK)
{
IPropertyBag *pPropBag;
HRESULT hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
if (FAILED(hr))
{
pMoniker->Release();
continue;
}
VARIANT var;
VariantInit(&var);
hr = pPropBag->Read(L"DevicePath", &var, 0);
if (SUCCEEDED(hr))
{
// The device path is not intended for display.
printf("Device path: %S\n", var.bstrVal);
VariantClear(&var);
}
IGraphBuilder *ppGraph;
ICaptureGraphBuilder2 *pBuild; // Capture Graph Builder
hr = InitCaptureGraphBuilder(&ppGraph, &pBuild);
IBaseFilter *pCap; // Video capture filter.
hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap);
if (SUCCEEDED(hr))
{
hr = ppGraph->AddFilter(pCap, L"Capture Filter");
if (SUCCEEDED(hr)) {
IBaseFilter *pMux;
hr = pBuild->SetOutputFileName(
&MEDIASUBTYPE_Avi, // Specifies AVI for the target file.
L"C:\a\Example.avi", // File name.
&pMux, // Receives a pointer to the mux.
NULL); // (Optional) Receives a pointer to the file sink.
hr = pBuild->RenderStream(
&PIN_CATEGORY_CAPTURE, // Pin category.
&MEDIATYPE_Video, // Media type.
pCap, // Capture filter.
NULL, // Intermediate filter (optional).
pMux); // Mux or file sink filter.
// Release the mux filter.
pMux->Release();
IConfigAviMux *pConfigMux = NULL;
hr = pMux->QueryInterface(IID_IConfigAviMux, (void**)&pConfigMux);
if (SUCCEEDED(hr))
{
pConfigMux->SetMasterStream(0);
pConfigMux->Release();
}
IConfigInterleaving *pInterleave = NULL;
hr = pMux->QueryInterface(IID_IConfigInterleaving, (void**)&pInterleave);
if (SUCCEEDED(hr))
{
pInterleave->put_Mode(INTERLEAVE_CAPTURE);
pInterleave->Release();
}
}
}
pPropBag->Release();
pMoniker->Release();
}
}
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
if (SUCCEEDED(hr))
{
IEnumMoniker *pEnum;
hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnum);
if (SUCCEEDED(hr))
{
DisplayDeviceInformation(pEnum);
pEnum->Release();
}
CoUninitialize();
}
int i;
std::cin >> i;
return 0;
}
您的代码枚举设备(来源),构建文件记录管道,然后丢弃所有内容并前进到下一个设备。
该代码不应该进行实际记录。
最少遗漏的部分是这个(DisplayDeviceInformation
的底部):
IConfigInterleaving *pInterleave = NULL;
hr = pMux->QueryInterface(IID_IConfigInterleaving, (void**)&pInterleave);
if (SUCCEEDED(hr))
{
pInterleave->put_Mode(INTERLEAVE_CAPTURE);
pInterleave->Release();
}
///////////////////////////////////////////////////
// Added
IMediaControl* pMediaControl;
ppGraph->QueryInterface(&pMediaControl);
pMediaControl->Run();
Sleep(5000);
pMediaControl->Stop();
///////////////////////////////////////////////////
pPropBag->Release();
pMoniker->Release();
我正在尝试按照 windows 开发中心上的 DirectShow 示例来制作我自己的可以将屏幕和音频捕获到视频的应用程序:Capturing Video to an AVI File
所有代码都正常,但没有任何反应,avi 文件没有出现。网络摄像头已连接,我可以使用 AMCap 看到流。在代码中,凸轮以正确的文件名出现。 windows SDK已安装,我的平台是win7 x64。
我的代码:
#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <dshow.h>
#pragma comment(lib, "strmiids")
HRESULT EnumerateDevices(REFGUID category, IEnumMoniker **ppEnum)
{
// Create the System Device Enumerator.
ICreateDevEnum *pDevEnum;
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL,
CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pDevEnum));
if (SUCCEEDED(hr))
{
// Create an enumerator for the category.
hr = pDevEnum->CreateClassEnumerator(category, ppEnum, 0);
if (hr == S_FALSE)
{
hr = VFW_E_NOT_FOUND; // The category is empty. Treat as an error.
}
pDevEnum->Release();
}
return hr;
}
HRESULT InitCaptureGraphBuilder(
IGraphBuilder **ppGraph, // Receives the pointer.
ICaptureGraphBuilder2 **ppBuild // Receives the pointer.
)
{
if (!ppGraph || !ppBuild)
{
return E_POINTER;
}
IGraphBuilder *pGraph = NULL;
ICaptureGraphBuilder2 *pBuild = NULL;
// Create the Capture Graph Builder.
HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL,
CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild);
if (SUCCEEDED(hr))
{
// Create the Filter Graph Manager.
hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void**)&pGraph);
if (SUCCEEDED(hr))
{
// Initialize the Capture Graph Builder.
pBuild->SetFiltergraph(pGraph);
// Return both interface pointers to the caller.
*ppBuild = pBuild;
*ppGraph = pGraph; // The caller must release both interfaces.
return S_OK;
}
else
{
pBuild->Release();
}
}
return hr; // Failed
}
void DisplayDeviceInformation(IEnumMoniker *pEnum)
{
IMoniker *pMoniker = NULL;
while (pEnum->Next(1, &pMoniker, NULL) == S_OK)
{
IPropertyBag *pPropBag;
HRESULT hr = pMoniker->BindToStorage(0, 0, IID_PPV_ARGS(&pPropBag));
if (FAILED(hr))
{
pMoniker->Release();
continue;
}
VARIANT var;
VariantInit(&var);
hr = pPropBag->Read(L"DevicePath", &var, 0);
if (SUCCEEDED(hr))
{
// The device path is not intended for display.
printf("Device path: %S\n", var.bstrVal);
VariantClear(&var);
}
IGraphBuilder *ppGraph;
ICaptureGraphBuilder2 *pBuild; // Capture Graph Builder
hr = InitCaptureGraphBuilder(&ppGraph, &pBuild);
IBaseFilter *pCap; // Video capture filter.
hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap);
if (SUCCEEDED(hr))
{
hr = ppGraph->AddFilter(pCap, L"Capture Filter");
if (SUCCEEDED(hr)) {
IBaseFilter *pMux;
hr = pBuild->SetOutputFileName(
&MEDIASUBTYPE_Avi, // Specifies AVI for the target file.
L"C:\a\Example.avi", // File name.
&pMux, // Receives a pointer to the mux.
NULL); // (Optional) Receives a pointer to the file sink.
hr = pBuild->RenderStream(
&PIN_CATEGORY_CAPTURE, // Pin category.
&MEDIATYPE_Video, // Media type.
pCap, // Capture filter.
NULL, // Intermediate filter (optional).
pMux); // Mux or file sink filter.
// Release the mux filter.
pMux->Release();
IConfigAviMux *pConfigMux = NULL;
hr = pMux->QueryInterface(IID_IConfigAviMux, (void**)&pConfigMux);
if (SUCCEEDED(hr))
{
pConfigMux->SetMasterStream(0);
pConfigMux->Release();
}
IConfigInterleaving *pInterleave = NULL;
hr = pMux->QueryInterface(IID_IConfigInterleaving, (void**)&pInterleave);
if (SUCCEEDED(hr))
{
pInterleave->put_Mode(INTERLEAVE_CAPTURE);
pInterleave->Release();
}
}
}
pPropBag->Release();
pMoniker->Release();
}
}
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
if (SUCCEEDED(hr))
{
IEnumMoniker *pEnum;
hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnum);
if (SUCCEEDED(hr))
{
DisplayDeviceInformation(pEnum);
pEnum->Release();
}
CoUninitialize();
}
int i;
std::cin >> i;
return 0;
}
您的代码枚举设备(来源),构建文件记录管道,然后丢弃所有内容并前进到下一个设备。
该代码不应该进行实际记录。
最少遗漏的部分是这个(DisplayDeviceInformation
的底部):
IConfigInterleaving *pInterleave = NULL;
hr = pMux->QueryInterface(IID_IConfigInterleaving, (void**)&pInterleave);
if (SUCCEEDED(hr))
{
pInterleave->put_Mode(INTERLEAVE_CAPTURE);
pInterleave->Release();
}
///////////////////////////////////////////////////
// Added
IMediaControl* pMediaControl;
ppGraph->QueryInterface(&pMediaControl);
pMediaControl->Run();
Sleep(5000);
pMediaControl->Stop();
///////////////////////////////////////////////////
pPropBag->Release();
pMoniker->Release();