创建 DXVA-HD 视频处理器

项目
08/14/2024

Microsoft DirectX 视频加速高清 (DXVA-HD) 使用两个主要接口：

IDXVAHD_Device。表示 DXVA-HD 设备。使用此接口查询设备功能和创建视频处理器。
IDXVAHD_VideoProcessor。表示一组视频处理功能。使用此接口执行视频处理 blit。

在下面的代码中，假定使用以下全局变量：

IDirect3D9Ex            *g_pD3D = NULL;     
IDirect3DDevice9Ex      *g_pD3DDevice = NULL;   // Direct3D device.
IDXVAHD_Device          *g_pDXVAHD = NULL;      // DXVA-HD device.
IDXVAHD_VideoProcessor  *g_pDXVAVP = NULL;      // DXVA-HD video processor.
IDirect3DSurface9       *g_pSurface = NULL;     // Video surface.
        
const D3DFORMAT     RENDER_TARGET_FORMAT = D3DFMT_X8R8G8B8;
const D3DFORMAT     VIDEO_FORMAT         = D3DFMT_X8R8G8B8; 
const UINT          VIDEO_FPS            = 60;
const UINT          VIDEO_WIDTH          = 640;
const UINT          VIDEO_HEIGHT         = 480;

创建 DXVA-HD 视频处理器：

使用视频内容的说明填充 DXVAHD_CONTENT_DESC 结构。驱动程序使用此信息作为优化视频处理器功能的提示。结构不包含完整的格式说明。

    DXVAHD_RATIONAL fps = { VIDEO_FPS, 1 }; 

    DXVAHD_CONTENT_DESC desc;

    desc.InputFrameFormat = DXVAHD_FRAME_FORMAT_PROGRESSIVE;
    desc.InputFrameRate = fps;
    desc.InputWidth = VIDEO_WIDTH;
    desc.InputHeight = VIDEO_HEIGHT;
    desc.OutputFrameRate = fps;
    desc.OutputWidth = VIDEO_WIDTH;
    desc.OutputHeight = VIDEO_HEIGHT;

调用 DXVAHD_CreateDevice 以创建 DXVA-HD 设备。此函数返回指向 IDXVAHD_Device 接口的 指针。

    hr = DXVAHD_CreateDevice(g_pD3DDevice, &desc, DXVAHD_DEVICE_USAGE_PLAYBACK_NORMAL,
        NULL, &pDXVAHD);

调用 IDXVAHD_Device：：GetVideoProcessorDeviceCaps。此方法使用设备功能填充 DXVAHD_VPDEVCAPS 结构。如果需要特定的视频处理功能（如 luma 键控制或图像筛选），请使用此结构检查其可用性。
```
    DXVAHD_VPDEVCAPS caps;

    hr = pDXVAHD->GetVideoProcessorDeviceCaps(&caps);
```
检查 DXVA-HD 设备是否支持所需的输入视频格式。检查支持的 DXVA-HD 格式主题更详细地介绍了此步骤。
检查 DXVA-HD 设备是否支持所需的输出格式。检查支持的 DXVA-HD 格式部分更详细地介绍了此步骤。

分配 DXVAHD_VPCAPS 结构的数组。必须分配的数组元素数由DXVAHD_VPDEVCAPS结构的 VideoProcessorCount 成员提供，在步骤 3 中获取。

    // Create the array of video processor caps. 

    DXVAHD_VPCAPS *pVPCaps = 
        new (std::nothrow) DXVAHD_VPCAPS[ caps.VideoProcessorCount ];

    if (pVPCaps == NULL)
    {
        return E_OUTOFMEMORY;
    }

每个 DXVAHD_VPCAPS 结构表示不同的视频处理器。可以循环访问此数组，以发现每个视频处理器的功能。结构包括有关视频处理器的去交错、电视拍摄和帧速率转换功能的信息。
选择要创建的视频处理器。 DXVAHD_VPCAPS 结构的 VPGuid 成员包含唯一标识视频处理器的 GUID。将此 GUID 传递给 IDXVAHD_Device：：CreateVideoProcessor 方法。方法返回 IDXVAHD_VideoProcessor 指针。
```
    HRESULT hr = pDXVAHD->GetVideoProcessorCaps(
        caps.VideoProcessorCount, pVPCaps);
```
（可选）调用 IDXVAHD_Device：：CreateVideoSurface 以创建输入视频图面数组。

下面的代码示例演示了完整的步骤序列：

// Initializes the DXVA-HD video processor.

// NOTE: The following example makes some simplifying assumptions:
//
// 1. There is a single input stream.
// 2. The input frame rate matches the output frame rate.
// 3. No advanced DXVA-HD features are needed, such as luma keying or IVTC.
// 4. The application uses a single input video surface.

HRESULT InitializeDXVAHD()
{
    if (g_pD3DDevice == NULL)
    {
        return E_FAIL;
    }

    HRESULT hr = S_OK;

    IDXVAHD_Device          *pDXVAHD = NULL;
    IDXVAHD_VideoProcessor  *pDXVAVP = NULL;
    IDirect3DSurface9       *pSurf = NULL;

    DXVAHD_RATIONAL fps = { VIDEO_FPS, 1 }; 

    DXVAHD_CONTENT_DESC desc;

    desc.InputFrameFormat = DXVAHD_FRAME_FORMAT_PROGRESSIVE;
    desc.InputFrameRate = fps;
    desc.InputWidth = VIDEO_WIDTH;
    desc.InputHeight = VIDEO_HEIGHT;
    desc.OutputFrameRate = fps;
    desc.OutputWidth = VIDEO_WIDTH;
    desc.OutputHeight = VIDEO_HEIGHT;

#ifdef USE_SOFTWARE_PLUGIN    
    HMODULE hSWPlugin = LoadLibrary(L"C:\\dxvahdsw.dll");

    PDXVAHDSW_Plugin pSWPlugin = (PDXVAHDSW_Plugin)GetProcAddress(hSWPlugin, "DXVAHDSW_Plugin");

    hr = DXVAHD_CreateDevice(g_pD3DDevice, &desc,DXVAHD_DEVICE_USAGE_PLAYBACK_NORMAL,
        pSWPlugin, &pDXVAHD);
#else
    hr = DXVAHD_CreateDevice(g_pD3DDevice, &desc, DXVAHD_DEVICE_USAGE_PLAYBACK_NORMAL,
        NULL, &pDXVAHD);
#endif
    if (FAILED(hr))
    {
        goto done;
    }

    DXVAHD_VPDEVCAPS caps;

    hr = pDXVAHD->GetVideoProcessorDeviceCaps(&caps);
    if (FAILED(hr))
    {
        goto done;
    }

    // Check whether the device supports the input and output formats.

    hr = CheckInputFormatSupport(pDXVAHD, caps, VIDEO_FORMAT);
    if (FAILED(hr))
    {
        goto done;
    }

    hr = CheckOutputFormatSupport(pDXVAHD, caps, RENDER_TARGET_FORMAT);
    if (FAILED(hr))
    {
        goto done;
    }

    // Create the VP device.
    hr = CreateVPDevice(pDXVAHD, caps, &pDXVAVP);
    if (FAILED(hr))
    {
        goto done;
    }

    // Create the video surface for the primary video stream.
    hr = pDXVAHD->CreateVideoSurface(
        VIDEO_WIDTH,
        VIDEO_HEIGHT,
        VIDEO_FORMAT,
        caps.InputPool,
        0,  // Usage
        DXVAHD_SURFACE_TYPE_VIDEO_INPUT,
        1,      // Number of surfaces to create
        &pSurf, // Array of surface pointers
        NULL
        );

    if (FAILED(hr))
    {
        goto done;
    }


    g_pDXVAHD = pDXVAHD;
    g_pDXVAHD->AddRef();

    g_pDXVAVP = pDXVAVP;
    g_pDXVAVP->AddRef();

    g_pSurface = pSurf;
    g_pSurface->AddRef();

done:
    SafeRelease(&pDXVAHD);
    SafeRelease(&pDXVAVP);
    SafeRelease(&pSurf);
    return hr;
}

此示例中的 CreateVPDevice 函数 show 创建视频处理器 (步骤 5-7) ：

// Creates a DXVA-HD video processor.

HRESULT CreateVPDevice(
    IDXVAHD_Device          *pDXVAHD,
    const DXVAHD_VPDEVCAPS& caps,
    IDXVAHD_VideoProcessor  **ppDXVAVP
    )
{
    // Create the array of video processor caps. 
    
    DXVAHD_VPCAPS *pVPCaps = 
        new (std::nothrow) DXVAHD_VPCAPS[ caps.VideoProcessorCount ];

    if (pVPCaps == NULL)
    {
        return E_OUTOFMEMORY;
    }

    HRESULT hr = pDXVAHD->GetVideoProcessorCaps(
        caps.VideoProcessorCount, pVPCaps);

    // At this point, an application could loop through the array and examine
    // the capabilities. For purposes of this example, however, we simply
    // create the first video processor in the list.

    if (SUCCEEDED(hr))
    {
        // The VPGuid member contains the GUID that identifies the video 
        // processor.

        hr = pDXVAHD->CreateVideoProcessor(&pVPCaps[0].VPGuid, ppDXVAVP);
    }

    delete [] pVPCaps;
    return hr;
}

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