从捕获源过滤器的优秀示例开始here我编写了自己的输入捕获设备,该设备在 Graph Studio Next 中运行良好,但在 Skype 或类似应用程序中并未显示为捕获设备(即网络摄像头)。
因为我想了解发生了什么,所以我请您帮助我找出那些应用程序需要什么来显示这样的设备。
一些相关代码:
dll.cpp
DEFINE_GUID(CLSID_VirtualCam, 0x8e14549a, 0xdb61, 0x4309, 0xaf, 0xa1, 0x35, 0x78, 0xe9, 0x27, 0xe9, 0x33);
const AMOVIESETUP_MEDIATYPE AMSMediaTypesVideo =
{
&MEDIATYPE_Video,
&MEDIASUBTYPE_NULL
};
const AMOVIESETUP_PIN AMSPinVCam[] =
{
{
L"Output", // Pin string name
FALSE, // Is it rendered
TRUE, // Is it an output
FALSE, // Can we have none
FALSE, // Can we have many
&CLSID_NULL, // Connects to filter
NULL, // Connects to pin
1, // Number of types
&AMSMediaTypesVideo // Pin Media types
}
};
const AMOVIESETUP_FILTER AMSFilterVCam =
{
&CLSID_VirtualCam, // Filter CLSID
FILTER_NAME, // String name
MERIT_PREFERRED, // Filter merit
1, // Number pins
AMSPinVCam // Pin details
};
CFactoryTemplate g_Templates[] =
{
{
FILTER_NAME,
&CLSID_VirtualCam,
CVCam::CreateInstance,
NULL,
&AMSFilterVCam
},
};
过滤器.cpp
CVCam::CVCam(LPUNKNOWN lpunk, HRESULT *phr) : CSource(LPCSTR(FILTER_NAME), lpunk, CLSID_VirtualCam)
{
ASSERT(phr);
CAutoLock cAutoLock(&m_cStateLock);
m_paStreams = (CSourceStream **) new CVCamStream*[1];
m_paStreams[0] = new CVCamStream(phr, this, FILTER_NAME);
}
HRESULT CVCam::QueryInterface(REFIID riid, void **ppv)
{
if (riid == _uuidof(IAMStreamConfig) || riid == _uuidof(IKsPropertySet))
{
HRESULT hr;
hr = m_paStreams[0]->QueryInterface(riid, ppv);
if (hr != S_OK) return hr;
}
else return CSource::QueryInterface(riid, ppv);
return S_OK;
}
CVCamStream::CVCamStream(HRESULT *phr, CVCam *pParent, LPCWSTR pPinName) : CSourceStream(LPCSTR(FILTER_NAME),phr, pParent, pPinName), m_pParent(pParent)
{
hdc = GetDC(NULL);
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
screen_height = GetSystemMetrics(SM_CYVIRTUALSCREEN);
screen_width = GetSystemMetrics(SM_CXVIRTUALSCREEN);
GetMediaType(8, &m_mt);
}
CVCamStream::~CVCamStream()
{
Gdiplus::GdiplusShutdown(gdiplusToken);
DeleteDC(hdc);
}
HRESULT CVCamStream::QueryInterface(REFIID riid, void **ppv)
{
if(riid == _uuidof(IAMStreamConfig)) *ppv = (IAMStreamConfig*)this;
else if(riid == _uuidof(IKsPropertySet)) *ppv = (IKsPropertySet*)this;
else return CSourceStream::QueryInterface(riid, ppv);
AddRef();
return S_OK;
}
我省略了与链接示例非常相似的其他功能,我猜配置是在这些功能中进行的。
您是否发现我的缺陷导致过滤器不被识别为视频捕获设备的任何证据?
当然,过滤器已注册(我在 DirectShow 过滤器管理器中看到它)。