使用directdraw切换表面实现实时视频播放的问题

[physics1988]

现在在wm下实现实时监控播放，采用ddraw的方式，现在遇到的问题是，我的主页面blt我的离屏页面。希望有经验的兄弟帮忙看一下。
ddra的初始化代码如下

	if (DirectDrawCreate(NULL,&(fb->dd_ptr),NULL) != DD_OK)
	{
		return false;
	}

	//设置协作层
	if ((fb->dd_ptr)->SetCooperativeLevel(wnd_handle,DDSCL_NORMAL) != DD_OK)
	{
		return false;
	}

	//创建主表面
	memset(&(fb->dds_desc), 0, sizeof(fb->dds_desc)) ;
	(fb->dds_desc).dwSize = sizeof(fb->dds_desc) ;
	(fb->dds_desc).dwFlags = DDSD_CAPS ;
	(fb->dds_desc).ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE;
	(fb->dds_desc).dwBackBufferCount = 1;
	if( (fb->dd_ptr)->CreateSurface(&(fb->dds_desc), &(fb->dds_ptr), NULL) != DD_OK)
	{
		return false;
	}
	if ((fb->dd_ptr)->CreateClipper( 0, &(fb->pcClipper), NULL ) != DD_OK )
	{
		return false;
	}

	if( fb->pcClipper->SetHWnd( 0, wnd_handle ) != DD_OK )
	{
		fb->pcClipper->Release();
		fb->pcClipper = NULL;
		return FALSE;
	}

	if( fb->dds_ptr->SetClipper( fb->pcClipper ) != DD_OK )
	{
		fb->pcClipper->Release();
		return FALSE;
	}

	// Done with clipper
	fb->pcClipper->Release();

	//创建离屏表面对象
	DDSURFACEDESC  ddsd;
	HRESULT hRet;
	memset(&ddsd, 0, sizeof(ddsd));
	ddsd.dwSize = sizeof(ddsd);
	ddsd.dwFlags =DDSD_WIDTH | DDSD_HEIGHT;
	ddsd.ddsCaps.dwCaps = DDSCAPS_SYSTEMMEMORY;
	ddsd.ddpfPixelFormat.dwFlags = DDPF_RGB;  
	ddsd.ddpfPixelFormat.dwSize = sizeof(ddsd.ddpfPixelFormat);  
	ddsd.ddpfPixelFormat.dwRGBBitCount = 24;  
	ddsd.ddpfPixelFormat.dwRBitMask = 0xff0000;  
	ddsd.ddpfPixelFormat.dwGBitMask = 0xff00;  
	ddsd.ddpfPixelFormat.dwBBitMask = 0xff; 
	ddsd.dwHeight = src_height;
	ddsd.dwWidth = src_width;
	if( fb->dd_ptr->CreateSurface(&ddsd, &(fb->offScreensurface), NULL) != DD_OK)
		return false;

对离屏表面写入rgb数据

	DDInstance->offScreensurface->Lock(0, &(DDInstance->dds_desc), DDLOCK_WAITNOTBUSY, 0);
//	DisplayYUV((unsigned int*)(DDInstance->), picture->data[0], picture->data[1], picture->data[2], c->width, c->height, picture->linesize[0], picture->linesize[1], 240);
//	DDInstance->dds_back_ptr->
//	DDInstance->dds_back_ptr->Blt(NULL, DDInstance->offScreensurface, NULL, DDBLT_ROP, &ddbltfx);
	HDC hDC; 
	DDInstance->offScreensurface->GetDC(&hDC); 
	SetDIBitsToDevice( 
		hDC, 
		0, 
		0, 
		g_pBmpinfo->bmiHeader.biWidth, // source rectangle width 
		g_pBmpinfo->bmiHeader.biHeight, // source rectangle height 
		0, // x-coord of source lower-left corner 
		0, // y-coord of source lower-left corner 
		0, // first scan line in array 
		g_pBmpinfo->bmiHeader.biHeight, // number of scan lines 
		g_bufRGB, // array of DIB bits 
		(const struct tagBITMAPINFO*)g_pBmpinfo, // bitmap information 
		DIB_RGB_COLORS // RGB or palette indexes 
		); 
	DDInstance->offScreensurface->ReleaseDC(hDC);
	DDInstance->offScreensurface->Unlock(0);

显示数据到主表面

EZFB_LOCK(DDInstance);
DDInstance->dds_ptr->Blt(&dstRect,DDInstance->offScreensurface,&src_rect,NULL,NULL);
EZFB_UNLOCK(DDInstance);

现在的问题是，整个屏幕一直没有变化
解码是确定没有问题的

[smilestone322]

SetDIBitsToDevice 你既然使用了它，就直接采用GDI显示得了