DShow 中使用 IVMRMixerBitmap9::SetAlphaBitmap 返回为E_INVALIDARG，请帮忙！

[wuqiuzhi]

对DShow不是很熟，目标是在视频上蒙一层自己绘制的线条
代码如下：
class myClass
{
....
}

HRESULT myClass::initVals(IGraphBuilder* pGraph, HWND parentHWND, CRect* pRect)
{// pRect 是当前的窗口对应的客户区的矩形
CStringA strMsg;
// create the VMR9 filter
CoCreateInstance(CLSID_VideoMixingRenderer9, NULL, CLSCTX_INPROC,
IID_IBaseFilter, (void**)&pVmr);
// add the VMR9 filter to the Graph Manager
HRESULT rt = pGraph->AddFilter(pVmr, L"Video_");

//strMsg.Format("\n retV:%d, p:%d",rt, (int)pVmr);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}
// get a pointer to the IVMRFilterConfig9 interface
rt = pVmr->QueryInterface(IID_IVMRFilterConfig9, (void**)&pConfig);
//strMsg.Format("\n retV:%d, p:%d",rt, (int)pConfig);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}
// make sure VMR9 is in windowless mode
//rt = pConfig->SetNumberOfStreams(4);
//strMsg.Format("\n retV:%d",rt);
//OutputDebugStringA(strMsg);
rt = pConfig->SetRenderingMode(VMR9Mode_Windowless);
strMsg.Format("\n retV:%d",rt);
OutputDebugStringA(strMsg);
//rt = pConfig->SetRenderingPrefs(RenderPrefs_AllowOverlays);
//strMsg.Format("\n retV:%d",rt);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}
rt = pConfig->Release();
pConfig = NULL;

// get a pointer to the IVMRWindowlessControl9 interface
rt = pVmr->QueryInterface(IID_IVMRWindowlessControl9, (void**)&pWC);
//strMsg.Format("\n retV:%d, p:%d",rt, (int)pWC);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}

// set destination rectangle for the video
//pRect->left -= 20;
//pRect->top -= 20;
//pRect->right -= 20;
//pRect->bottom -= 20;
rt = pWC->SetVideoPosition(NULL, pRect);
//strMsg.Format("\n retV:%d",rt);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}
// specify the container window that the video should be clipped to
rt = pWC->SetVideoClippingWindow(parentHWND);
//strMsg.Format("\n retV:%d",rt);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}

// used for display of bmp on video
rt = pWC->QueryInterface(IID_IVMRMixerBitmap9, (LPVOID *)&pBmp);
//strMsg.Format("\n retV:%d, p:%d",rt, (int)pBmp);
//OutputDebugStringA(strMsg);
if(rt != S_OK)
{
return rt;
}

ZeroMemory(&bmpInfo, sizeof(bmpInfo) );
// bmpInfo.dwFlags |= VMRBITMAP_HDC;
// Set the transparency value (1.0 is opaque, 0.0 is transparent).


return S_OK;
}
//上面这个函数，都没有错误出现

//问题出在下面这个函数
HRESULT myClass::createCompDC_BMP(CDC* pdc, CRect ctrlRect)
{//此处CtrlRect可能会变化
if(fBmpCompWidth != 0)
{
DeleteObject(m_hBitmap);
}
CStringA strMsg;

HRESULT rt = pWC->SetVideoPosition(NULL, &ctrlRect);
strMsg.Format("\n ret for set:0X%x \n",rt);
OutputDebugStringA(strMsg);

//CSize sz = pdc->GetWindowExt();
fBmpCompWidth = ctrlRect.Width();//sz.cx;
fBmpCompHeight = ctrlRect.Height();//sz.cy;
strMsg.Format("\n size sz: cx:%d; cy:%d \n",fBmpCompWidth, fBmpCompHeight);
OutputDebugStringA(strMsg);
//创建兼容DC
CDC mCompatibleDC;
if(!mCompatibleDC.CreateCompatibleDC(pdc))
{
return S_FALSE;
}
//创建位图
if(!m_myBitmap.CreateCompatibleBitmap(pdc, fBmpCompWidth, fBmpCompHeight))
{
return S_FALSE;
}//rect.Width(), rect.Height());
m_hBitmap = (HBITMAP)m_myBitmap;
pdc->DeleteDC();

mCompatibleDC.SelectObject(&m_myBitmap);

CPen pen(PS_SOLID, 3, RGB(250, 0, 0));
CPen *curPen = mCompatibleDC.SelectObject(&pen);

mCompatibleDC.FillSolidRect(0, 0, fBmpCompWidth, fBmpCompHeight, m_polygonBGClr);
mCompatibleDC.MoveTo(0, 20);
mCompatibleDC.LineTo(fBmpCompWidth - 1, 20);

mCompatibleDC.SelectObject(curPen);

///////////////set bmpInfo
bmpInfo.dwFlags |= VMRBITMAP_HDC;
bmpInfo.fAlpha = 0.9f;
//
bmpInfo.hdc = mCompatibleDC.m_hDC;
CRect myRect;
myRect.SetRect(0, 0, fBmpCompWidth, fBmpCompHeight);

strMsg.Format("\n myRect: left:%d; right:%d; top:%d; bottom:%d \n",myRect.left, myRect.right, myRect.top, myRect.bottom);
OutputDebugStringA(strMsg);

bmpInfo.rSrc = myRect;

bmpInfo.rDest.right = 1.0f;
bmpInfo.rDest.left = 0.0f;
bmpInfo.rDest.top = 0.0f;
bmpInfo.rDest.bottom = 1.0f;

bmpInfo.clrSrcKey = m_polygonBGClr;

bmpInfo.dwFlags |= VMRBITMAP_SRCCOLORKEY;


strMsg.Format("\n dwFlag: 0X%x \n",bmpInfo.dwFlags);
OutputDebugStringA(strMsg);

//VMRALPHABITMAP oldBmp;
//pBmp->GetAlphaBitmapParameters(&oldBmp);

rt = pBmp->SetAlphaBitmap(&bmpInfo);

strMsg.Format("\n ret for set:0X%x \n",rt);
OutputDebugStringA(strMsg);//此处输出： ret for set:0X80070057


return S_OK;
}

[wuqiuzhi]

自己先顶一下，解决马上给分，请各位大神搭救！

[oyljerry]

还是要检查你调用的API的参数是否正确。错误信息是这么提示的

[wuqiuzhi]

引用 2 楼 oyljerry 的回复:

还是要检查你调用的API的参数是否正确。错误信息是这么提示的

对bmpInfo，打印出来的结果： DWORD dwFlags; = 10 HDC hdc; = 0xd20139d5 ！= 0 IDirect3DSurface9 *pDDS; = 0 RECT rSrc; = {0, 0, w, h} VMR9NormalizedRect rDest; = {0.f, 0.f, 1.f, 1.f} FLOAT fAlpha; = 0.9f COLORREF clrSrcKey; != 0 DWORD dwFilterMode; = 0 应该是没有问题的啊！ 会不会是在AddFilter上有顺序的要求？比如必须放在哪个的相对位置上？我最前和最后都试过，没有效果。

[赵4老师]

网上搜类似源代码，参考之。

[wuqiuzhi]

网上搜了很多资料，不知道是我没有理解还是大家这种情况遇到的不多，反正我没有找到相似的问题的解决办法，所以只有来向大家求助了！ 谢谢！

[wuqiuzhi]

再顶一次，看有没有希望获得答案哦！

[goldenepoch]

楼主您用directshow添加水印信息成功了吗？能不能发个示例给我。[e-mail],感激不尽。

[Ilson_]

//rt = pConfig->SetNumberOfStreams(4); 需要添加这句话 设置多个视频流