dirctshow视频采集
时间: 2024-05-19 22:13:31 浏览: 12
DirectShow是Microsoft Windows平台上视频和音频的编程框架,用于媒体播放、捕获和处理。DirectShow提供了一个可扩展的体系结构,通过它可以方便地添加新的功能,支持各种音视频格式,包括MPEG、AVI、WMV、MP3等等。DirectShow提供了一个统一的接口,使得开发人员可以轻松地实现视频采集功能。
在DirectShow中,视频采集通常通过Video Capture Filter实现。Video Capture Filter是DirectShow的一种过滤器,它可以从摄像头、视频捕获卡等设备中获取视频数据,然后将视频数据传递给下一个处理过滤器。Video Capture Filter的使用可以通过DirectShow SDK提供的Sample Capture应用程序来实现。
以下是使用DirectShow实现视频采集的基本步骤:
1. 枚举可用的视频捕获设备,包括摄像头、视频捕获卡等。
2. 创建Video Capture Filter对象,指定要采集的设备。
3. 设置视频捕获的参数,包括图像分辨率、帧率、色彩格式等。
4. 创建Sample Grabber Filter对象,用于获取视频数据。
5. 连接Video Capture Filter和Sample Grabber Filter,建立数据流通路。
6. 开始视频捕获,获取视频数据并进行处理。
7. 停止视频捕获,释放资源。
以上是使用DirectShow实现视频采集的基本步骤,具体实现过程需要根据具体的应用需求进行调整和优化。
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.