dirctshow视频采集

DirectShow是一个由Microsoft开发的多媒体框架，可以用于视频采集、处理和播放等多媒体应用。下面是使用DirectShow进行视频采集的步骤：

1. 创建一个DirectShow的过滤器图形，包括视频采集设备过滤器和视频编码器过滤器等。

2. 设置视频采集设备的参数，如分辨率、帧率、视频格式等。

3. 创建一个视频采集过滤器和一个视频编码器过滤器，并将它们连接起来。

4. 创建一个视频呈现过滤器，将视频编码后的数据呈现在屏幕上。

5. 开始视频采集，将采集到的视频数据传递给视频编码器进行编码，并将编码后的数据传递给视频呈现过滤器进行呈现。

需要注意的是，DirectShow在Windows 10系统中已经被淘汰，推荐使用Media Foundation或者Windows API for Audio and Video (WinRT)来进行视频采集。

相关问题

dirctshow编程实现视频采集

DirectShow是一个应用程序编程接口（API），它被用于Windows操作系统中的多媒体架构。在DirectShow中，视频采集是通过使用视频捕获过滤器来实现的。视频捕获过滤器是一个DirectShow过滤器，它可以从摄像头或视频设备中捕获视频流。以下是使用DirectShow编程实现视频采集的一般步骤：

1. 引入DirectShow库文件和头文件。
2. 创建一个图形渲染器过滤器，并将其添加到Filter Graph中。
3. 创建一个视频捕获过滤器，并将其添加到Filter Graph中。
4. 从视频捕获过滤器中获取视频捕获设备。
5. 设置视频捕获设备的属性，例如分辨率、帧速率等。
6. 将视频捕获过滤器连接到图形渲染器过滤器。
7. 开始视频捕获并显示采集的视频流。
8. 停止视频捕获并释放资源。

下面是一个使用DirectShow库实现视频采集的示例代码：

#include <dshow.h>

int main()
{
    HRESULT hr;
    ICaptureGraphBuilder2* pCaptureGraphBuilder = NULL;
    IGraphBuilder* pGraphBuilder = NULL;
    IBaseFilter* pVideoCaptureFilter = NULL;
    IBaseFilter* pVideoRendererFilter = NULL;
    IMoniker* pVideoCaptureMoniker = NULL;
    IEnumMoniker* pEnumMoniker = NULL;
    ULONG cFetched;

    // Initialize COM
    CoInitialize(NULL);

    // Create the capture graph builder
    hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pCaptureGraphBuilder);
    if (FAILED(hr)) {
        return hr;
    }

    // Create the filter graph manager
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void**)&pGraphBuilder);
    if (FAILED(hr)) {
        return hr;
    }

    // Enumerate the video capture devices
    hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnumMoniker);
    if (FAILED(hr)) {
        return hr;
    }

    // Get the first video capture device
    hr = pEnumMoniker->Next(1, &pVideoCaptureMoniker, &cFetched);
    if (FAILED(hr) || cFetched != 1) {
        return hr;
    }

    // Create the video capture filter
    hr = pVideoCaptureMoniker->BindToObject(NULL, NULL, IID_IBaseFilter, (void**)&pVideoCaptureFilter);
    if (FAILED(hr)) {
        return hr;
    }

    // Add the video capture filter to the filter graph
    hr = pGraphBuilder->AddFilter(pVideoCaptureFilter, L"Video Capture Filter");
    if (FAILED(hr)) {
        return hr;
    }

    // Create the video renderer filter
    hr = CoCreateInstance(CLSID_VideoRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pVideoRendererFilter);
    if (FAILED(hr)) {
        return hr;
    }

    // Add the video renderer filter to the filter graph
    hr = pGraphBuilder->AddFilter(pVideoRendererFilter, L"Video Renderer Filter");
    if (FAILED(hr)) {
        return hr;
    }

    // Connect the video capture filter to the video renderer filter
    hr = pCaptureGraphBuilder->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pVideoCaptureFilter, NULL, pVideoRendererFilter);
    if (FAILED(hr)) {
        return hr;
    }

    // Start the video capture
    hr = pCaptureGraphBuilder->ControlStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pVideoCaptureFilter, NULL, 0, 0);
    if (FAILED(hr)) {
        return hr;
    }

    // Run the filter graph
    hr = pGraphBuilder->QueryInterface(IID_IMediaControl, (void**)&pMediaControl);
    if (FAILED(hr)) {
        return hr;
    }

    hr = pMediaControl->Run();
    if (FAILED(hr)) {
        return hr;
    }

    // Wait for the user to stop the video capture
    getchar();

    // Stop the filter graph
    hr = pMediaControl->Stop();
    if (FAILED(hr)) {
        return hr;
    }

    // Release resources
    pGraphBuilder->Release();
    pCaptureGraphBuilder->Release();
    pVideoCaptureFilter->Release();
    pVideoRendererFilter->Release();
    pVideoCaptureMoniker->Release();
    pEnumMoniker->Release();

    // Uninitialize COM
    CoUninitialize();

    return 0;
}

HRESULT EnumerateDevices(REFGUID category, IEnumMoniker** ppEnumMoniker)
{
    HRESULT hr;
    IMoniker* pMoniker = NULL;
    ICreateDevEnum* pCreateDevEnum = NULL;

    // Create the system device enumerator
    hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void**)&pCreateDevEnum);
    if (FAILED(hr)) {
        return hr;
    }

    // Create an enumerator for the specified category
    hr = pCreateDevEnum->CreateClassEnumerator(category, ppEnumMoniker, 0);
    if (hr == S_FALSE) {
        return E_FAIL;
    }

    // Release resources
    pCreateDevEnum->Release();

    return S_OK;
}

这个示例程序列举了所有视频捕获设备，并选择第一个设备进行视频捕获。它还创建了一个图形渲染器过滤器，并将其连接到视频捕获过滤器。用户可以通过按下Enter键来停止视频捕获。

window10 dirctshow

DirectShow is a multimedia framework and API (Application Programming Interface) developed by Microsoft for Windows operating systems. It enables the playback, capture, and processing of multimedia streams such as audio and video. DirectShow is a part of the Microsoft DirectX API and is commonly used in media players, video editors, and other multimedia applications on Windows.

In Windows 10, DirectShow is still available and can be used for multimedia playback and processing. However, Microsoft is gradually phasing out DirectShow and moving towards newer multimedia APIs such as Media Foundation. Nonetheless, DirectShow remains a reliable and widely used framework for multimedia development on Windows.