winCE6.0 DDraw播放yuv420实现

最新推荐文章于 2011-10-25 18:20:08 发布

原创最新推荐文章于 2011-10-25 18:20:08 发布 · 790 阅读

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本文详细介绍了如何在飞凌6410开发板上，利用Wince6.0环境下的ddraw API，实现窗口上播放YUV420数据的过程，包括窗口创建、ddraw初始化、页面显示等关键步骤。

发现在wince的ddraw有很多跟win32不一样的地方

飞凌6410开发板，wince6.0

简单的实现了在窗口上播放yuv420数据

具体的步骤为：

1.窗口创建

2.ddraw初始化，ddraw对象、主屏页面、离屏页、裁剪器创建等

3.yuv数据转换rgb显示

ddraw的初始化：

if (FAILED(hRet = DirectDrawCreate(NULL, &g_pDD, NULL)))
return InitFail(hWnd, hRet, TEXT("DirectDrawCreate FAILED"));

    // Get exclusive mode
    if (FAILED(hRet = g_pDD->SetCooperativeLevel(hWnd, DDSCL_NORMAL)))
{
        return InitFail(hWnd, hRet, TEXT("SetCooperativeLevel FAILED"));
}
    // Create the primary surface with 1 back buffer
    memset(&ddsd, 0, sizeof(ddsd));
    ddsd.dwSize = sizeof(ddsd);
    ddsd.dwFlags = DDSD_CAPS ;
    ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE ;//| DDSCAPS_FLIP;

    if (FAILED(hRet = g_pDD->CreateSurface(&ddsd, &g_pDDSPrimary, NULL)))
    {
        if (hRet == DDERR_NOFLIPHW)
            return InitFail(hWnd, hRet, TEXT("******** Display driver doesn't support flipping surfaces. ********"));

        return InitFail(hWnd, hRet, TEXT("CreateSurface FAILED"));
    }

    memset(&ddsd, 0, sizeof(ddsd));
    ddsd.dwSize = sizeof(ddsd);
    ddsd.dwFlags = DDSD_WIDTH | DDSD_HEIGHT;
    if (FAILED(hRet = g_pDDSPrimary->GetSurfaceDesc(&ddsd)))
    {
        return InitFail(hWnd, hRet, TEXT("GetSurfaceDesc FAILED"));
    }
    g_dwWidth = ddsd.dwWidth;
    g_dwHeight = ddsd.dwHeight;

    memset(&ddsd, 0, sizeof(ddsd));
    ddsd.dwSize = sizeof(ddsd);
    ddsd.dwFlags =   DDSD_HEIGHT | DDSD_WIDTH;
    ddsd.dwWidth = 352;
    ddsd.dwHeight = 288;
    g_pDD->CreateSurface(&ddsd, &g_pDDSOffSurface, NULL);
if (g_pDDSOffSurface == NULL)
{
  AfxMessageBox(TEXT("Create surface fail"));
}

g_pDD->CreateClipper(0, &g_pDDClipper, NULL);
g_pDDClipper->SetHWnd(0, hWnd);
g_pDDSPrimary->SetClipper(g_pDDClipper);

页面显示：

DDSURFACEDESC ddsd;
ddsd.dwSize = sizeof(ddsd);

g_pDDSOffSurface->Lock(NULL, &ddsd, DDLOCK_WAITNOTBUSY, NULL);

CopyYuvToSurface((UINT16 *)ddsd.lpSurface, ddsd.lPitch, pYuv420, width, height);

g_pDDSOffSurface->Unlock(NULL);

g_pDDSPrimary->Blt(NULL, g_pDDSOffSurface, rcSrcRect,
DDBLT_WAITVSYNC , NULL);