DirectShow - 如何使用文本叠加视频

#include<windows.h>
#include <dshow.h>

// 定义视频渲染过滤器的 CLSID
const CLSID CLSID_VideoMixingRenderer9 = {0x51b4abf3, 0x748f, 0x4e3b, {0xb2, 0xb0, 0xd0, 0xd1, 0xcc, 0x3f, 0x60, 0x21}};

int main()
{
    // 初始化 COM 库
    HRESULT hr = CoInitialize(NULL);

    // 创建 DirectShow 图形
    IGraphBuilder *pGraph = NULL;
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);

    // 添加视频源过滤器和视频渲染过滤器到图形中
    IBaseFilter *pSourceFilter = NULL;
    IBaseFilter *pVideoRendererFilter = NULL;
    hr = pGraph->AddSourceFilter(L"input.avi", L"Source Filter", &pSourceFilter);
    hr = CoCreateInstance(CLSID_VideoMixingRenderer9, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pVideoRendererFilter);
    hr = pGraph->AddFilter(pVideoRendererFilter, L"Video Renderer");

    // 渲染视频文件
    hr = pGraph->RenderFile(L"input.avi", NULL);

    // 设置视频窗口样式和位置
    IVideoWindow *pVideoWindow = NULL;
    hr = pGraph->QueryInterface(IID_IVideoWindow, (void **)&pVideoWindow);
    hr = pVideoWindow->put_Caption(L"Video Player");
    hr = pVideoWindow->put_WindowStyle(WS_OVERLAPPEDWINDOW);
    hr = pVideoWindow->put_Left(0);
    hr = pVideoWindow->put_Top(0);
    hr = pVideoWindow->put_Width(640);
    hr = pVideoWindow->put_Height(480);

    // 控制视频播放
    IMediaControl *pMediaControl = NULL;
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
    hr = pMediaControl->Run();

    // 等待视频播放结束
    long evCode;
    pMediaControl->WaitForCompletion(INFINITE, &evCode);

    // 释放资源
    pMediaControl->Release();
    pVideoWindow->Release();
    pVideoRendererFilter->Release();
    pSourceFilter->Release();
    pGraph->Release();

    return 0;
}