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FFmpeg滤镜实现区域视频增强及 D3D实现视频播放区的拉大缩小(三)

2017-10-13 10:22:47 【大中小】浏览:7167次

ght, target_format, SWS_BICUBIC, NULL, NULL, NULL); sws_scale(img_convert_ctx, (const uint8_t* const*)picref->data, picref->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize); _d3d_video_render.Render_Texture(pFrameYUV->data[0],picref->width,picref->height) ; sws_freeContext(img_convert_ctx); } av_frame_unref(picref); } SDL_Delay(10); } } av_free_packet(packet); LeaveCriticalSection(&cs) ; }

apply_filters函数修改滤镜的设置。另外有两个比较重要的函数：av_buffersrc_add_frame函数和av_buffersink_get_frame_flags函数。至于区域增强，其实主要就是如下代码：

snprintf(filter_test, sizeof(filter_test), "[in]split[ori][tmp];[tmp]crop=%d:%d:%d:%d,eq=brightness=%f:contrast=%f:saturation=%f[eq_enhance];[ori][eq_enhance]overlay=%d:%d[out]", 
        iWidth, iHeight, x, y, t_brightness_value, t_contrast_value, t_saturation_value, x, y);

含义就是把输入流分成ori和tmp，把tmp从像素坐标（x,y）开始，以iWidth为宽，以iHeight为高的部分crop出来，使用eq滤镜后再叠加到ori对应位置。

2.D3D实现视频播放区的拉大缩小

用D3D的纹理可以做出许多非常有意思的效果。使用纹理可以做各种变换轻松实现视频播放区的拉大缩小，视频旋转也可以非常轻松的实现，我没有做，不过只需要修改一下相机的向上方向就可以轻松实现90°的旋转，但要实现任意角度，则还需要稍作计算，我没有做，就不多说了。

初始化D3D:

BOOL CD3DVidRender::InitD3D_Texure(HWND hwnd, int img_width, int img_height, RENDER_DATA_TYPE data_type)
{
    if (!hwnd)
    {
        return false ;
    }

    D3DDEVTYPE deviceType = D3DDEVTYPE_HAL ;
    bool windowed = true ;

    HRESULT hr = 0;

    // Step 1: Create the IDirect3D9 object.

    IDirect3D9* d3d9 = 0;
    d3d9 = Direct3DCreate9(D3D_SDK_VERSION);

    if( !d3d9 )
    {
        ::MessageBox(0, "Direct3DCreate9() - FAILED", 0, 0);
        return false;
    }

    // Step 2: Check for hardware vp.
    D3DCAPS9 caps;
    d3d9->GetDeviceCaps(D3DADAPTER_DEFAULT, deviceType, &caps);

    int vp = 0;
    if( caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT )
        vp = D3DCREATE_HARDWARE_VERTEXPROCESSING;
    else
        vp = D3DCREATE_SOFTWARE_VERTEXPROCESSING;

    // Step 3: Fill out the D3DPRESENT_PARAMETERS structure.
    D3DDISPLAYMODE        d3ddm;
    UINT adapter = D3DADAPTER_DEFAULT;
    IDirect3D9_GetAdapterDisplayMode(d3d9, adapter, &d3ddm);

    D3DPRESENT_PARAMETERS d3dpp;
    // 默认不使用多采样
    D3DMULTISAMPLE_TYPE multiType = D3DMULTISAMPLE_NONE;
    if(d3d9->CheckDeviceMultiSampleType(D3DADAPTER_DEFAULT,
        D3DDEVTYPE_HAL, D3DFMT_A8R8G8B8, !windowed,
        D3DMULTISAMPLE_4_SAMPLES,
        NULL) == D3D_OK)
    {
        multiType = D3DMULTISAMPLE_4_SAMPLES;
    }

    d3dpp.BackBufferFormat             = D3DFMT_A8R8G8B8;
    d3dpp.BackBufferWidth            = img_width;
    d3dpp.BackBufferHeight           = img_height;
    d3dpp.BackBufferCount            = 1;
    d3dpp.MultiSampleType            = multiType;
    d3dpp.MultiSampleQuality         = 0;
    d3dpp.SwapEffect                 = D3DSWAPEFFECT_DISCARD; 
    d3dpp.hDeviceWindow              = hwnd;
    d3dpp.Windowed                   = windowed;
    d3dpp.EnableAutoDepthStencil     = true; 
    d3dpp.AutoDepthStencilFormat     = D3DFMT_D24S8;
    d3dpp.Flags                      = 0;
    d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
    d3dpp.PresentationInterval       = D3DPRESENT_INTERVAL_IMMEDIATE;

    // Step 4: Create the device.
    hr = d3d9->CreateDevice(
        D3DADAPTER_DEFAULT, // primary adapter
        deviceType,         // device type
        hwnd,               // window associated with device
        vp,                 // vertex processing
        &d3dpp,             // present parameters
        &m_pDirect3DDevice);            // return created device

    if( FAILED(hr) )
    {
        // try

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