我是DirectShow的新手,所以这个库的某些部分我不太懂。 我已经看到了示例DxSnap,但我需要捕获帧而不预览它,以便进一步处理。我该怎么办?
答案 0 :(得分:11)
如果您主要关注的是“访问网络摄像头”而不是“使用DirectShow访问网络摄像头”,那么我会看一下AForge.NET-Framework。我尝试使用DirectShow只是为了发现我可以用更少的代码在更短的时间内对多个视频源做同样的事情。
以下是一些示例代码:Access to USB cameras and video files using DirectShow
答案 1 :(得分:4)
答案 2 :(得分:0)
这里是一个例子。如图所示,构造一个Windows窗体。
Click this link to see how the WinForm looks
这些名称使我们可以将事件处理程序(下面的代码)与相应的控件相关联。
如果程序已成功构建并运行,请使用 combobox 选择可用的源。点击“ 开始”以查看视频供稿。点击“ 复制”,将图像克隆到剪贴板上。点击“ 停止”以关闭图像供稿。
该代码已使用Microsoft测试:
要构建代码,包含此代码的项目需要具有以下参考:
NuGet可以将软件包拉入项目。在Visual Studio IDE中:
搜索“ AForge”并安装相应的软件包。
代码:
using System;
using System.Drawing;
using System.Windows.Forms;
using CameraDevice;
using AForge.Video.DirectShow;
using System.Threading;
namespace CameraCaptureTest3
{
public partial class Form1 : Form
{
CameraImaging camImg;
bool StopVideo = true;
Thread thrVideo;
object mImageLock;
FilterInfoCollection videoDevices;
public Form1()
{
InitializeComponent();
camImg = new CameraImaging();
mImageLock = new object();
// enumerate video devices
videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
cbCameraDevices.Items.Clear();
foreach(FilterInfo i in videoDevices) cbCameraDevices.Items.Add(i.Name);
}
//---------------------------------------------------------
// VideoRecordin() is meant to be run on a separate thread
//--------------------------------------------------------- private void VideoRecording()
{
camImg.videoSource.Start();
while (!StopVideo)
{
lock (mImageLock)
{
Bitmap tmp = (Bitmap)camImg.bitmap.Clone();
if (InvokeRequired)
{
BeginInvoke(new MethodInvoker(() =>
{
pictureBox1.Image = tmp;
pictureBox1.Invalidate();
}));
}
else
{
pictureBox1.Image = tmp;
pictureBox1.Invalidate();
}
}
Thread.Sleep(33);
}
camImg.videoSource.Stop();
}
private void btnStartVideo_Click(object sender, EventArgs e)
{
StopVideo = false;
try
{
camImg.videoSource = new VideoCaptureDevice(camImg.videoDevices[cbCameraDevices.SelectedIndex].MonikerString);
thrVideo = new Thread(VideoRecording);
thrVideo.Start();
Thread.Sleep(1000);
lblRecording.Visible = true;
}
catch (Exception)
{
MessageBox.Show("No camera is chosen.", "Exception", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
StopVideo = true;
if (thrVideo != null) thrVideo.Join();
lblRecording.Visible = false;
Application.DoEvents();
}
private void button1_Click(object sender, EventArgs e)
{
StopVideo = true;
if (thrVideo != null)
while (thrVideo.ThreadState == ThreadState.Running)
Application.DoEvents();
pictureBox1.Image = null;
lblRecording.Visible = false;
}
private void button2_Click(object sender, EventArgs e)
{
Clipboard.SetImage(pictureBox1.Image);
}
}
}