如何使用JMF捕獲視頻，但不安裝JMF

Question

我正在研究的視頻會議項目使用JMF來捕獲視頻和音頻，並將其傳輸到另一個端點。 問題是我的團隊不希望產品的用戶必須安裝JMF。

我認為分享我們對這個問題的解決方案可能是值得的。 有用。 它運作良好。 我的問題是：有沒有人有更好的方法呢？

環境：Windows，XP及以上版本

1. 下載適用於Windows的JMF

2. 將其安裝在您的機器上

3. 在jmf安裝后，在system32文件夾中找到以下dll ：

   jmacm.dll
   jmam.dll
   jmcvid.dll
   jmdaud.dll
   jmdaudc.dll
   jmddraw.dll
   jmfjawt.dll
   jmg723.dll
   jmgdi.dll
   jmgsm.dll
   jmh261.dll
   jmh263enc.dll
   jmjpeg.dll
   jmmci.dll
   jmmpa.dll
   jmmpegv.dll
   jmutil.dll
   jmvcm.dll
   jmvfw.dll
   jmvh263.dll
   jsound.dll

4. 將dll復制到臨時文件夾中

5. 找到jmf.properties文件（在您的計算機上搜索它）
6. 下載JMF源代碼
   在源代碼中，找到以下文件：

JMFinit.java
JMRPropertiesGen.java
Registry.java
RegistryGen.java

1. 創建一個包; 我稱之為JMFNoInstall
2. 添加步驟6中列出的文件
3. 將一個名為Main的類添加到此包中：

package JMFNoInstall;
// add your imports and whatnot here
public class Main()
{
    public Main()
    {
        JMFinit.main(null);
        JMFPropertiesGen.main(null);
        Registry.main(null);
        RegistryGen.main(new String[] {
            new File(".").getAbsolutePath(),
            "registrylib"
        });
    }
}

jmf.properties文件需要與具有main方法的類位於同一文件夾中，或者與包含main方法的JAR存檔位於同一文件夾中。
dll需要進入win32文件夾。 您可以讓程序檢查它們是否在win32文件夾中。 如果不是，您可以將它從某個位置復制過來。 只要上面列出的Main類運行， jmf.properties文件就會更新。 您只需要運行一次，第一次運行程序，或者用戶是否想要添加新的捕獲設備。 最后，確保包含Windows JMF下載的jmf.jar文件和jmfcom.jar包含在類路徑中。 你很高興在這一點上去。 JMF的所有功能，而無需實際安裝它。

實際上並沒有涉及到很多工作，您可以很容易地將它合並到自定義安裝程序中。

有沒有人找到更好的方法來做到這一點？ 這樣做有一些陷阱。

編輯：我認為分享我創建的一些代碼可能是值得的。 當然你需要修改它來處理你的問題。 它不會編譯，但缺少的東西應該很容易重新創建。 但是認為這可能是幫助人們的良好起點。 detectCaptureDevices函數可能會幫助大多數人。 我去的時候會更新這門課。

import GUI.Window;
import GlobalUtilities.OS;
import GlobalUtilities.ProgressBar;
import GlobalUtilities.FileUtilities;
import java.io.File;
import java.util.ArrayList;
import java.util.Vector;
import javax.swing.text.Utilities;


/**
 * This class providex easy access to the most needed info about JMF. You can test
 * a JMF install (Windows only currently) and also get info about the captrue
 * devices hooked up to JMF.
 * @author dvargo
 */
public class JMFRunner
{
    /**
     * Show the status of operations
     */
    final ProgressBar theBar = new ProgressBar();
    /**
     * Location where the dll's JMF relies on need to be placed
     */
    final String windowsDllFolder = "C:\\WINDOWS\\system32\\";

    final String linuxDllFolder = "/usr/lib/";

    /**
     * Dll's that JMF uses
     */
    final String[] windowsDllList = new String[]{
        "jmacm.dll",
        "jmam.dll",
        "jmcvid.dll",
        "jmdaud.dll",
        "jmdaudc.dll",
        "jmddraw.dll",
        "jmfjawt.dll",
        "jmg723.dll",
        "jmgdi.dll",
        "jmgsm.dll",
        "jmh261.dll",
        "jmh263enc.dll",
        "jmjpeg.dll",
        "jmmci.dll",
        "jmmpa.dll",
        "jmmpegv.dll",
        "jmutil.dll",
        "jmvcm.dll",
        "jmvfw.dll",
        "jmvh263.dll",
        "jsound.dll"};

    String[] linuxDllList = new String[]{
        "libjmcvid.so",
        "libjmdaud.so",
        "libjmfjawt.so",
        "libjmg723.so",
        "libjmgsm.so",
        "libjmh261.so",
        "libjmh263enc.so",
        "libjmjpeg.so",
        "libjmmpa.so",
        "libjmmpegv.so",
        "libjmmpx.so",
        "libjmutil.so",
        "libjmv4l.so",
        "libjmxlib.so"
    };

    String [] dlls= null;
    String dir = null;

    /**
     * List of the video capture devices found by JMF
     */
    Vector videoDevices = null;
    /**
     * List of the audio capture devices found by JMF
     */
    Vector audioDevices = null;

    public JMFRunner()
    {
        if(OS.isWindows())
        {
            dlls = windowsDllList;
            dir = windowsDllFolder;
        }
        else if(OS.isLinux())
        {
            dlls = linuxDllList;
            dir = linuxDllFolder;
        }
        else
        {
            Window.getLogger().severe("Operating system does not support JMF");
        }

    }

    /**
     * Adds new capture devices
     */
    public void detectCaptureDecives()
    {


        Thread theTread = new Thread(theBar);
        theTread.start();
        theBar.repaint();

        JMFInit.main(new String[] {""});
        JMFPropertiesGen.main(new String[] {""});
        Registry.main(new String[] {""});
        RegistryGen.main(new String[] {"-d",
            new File(".").getAbsolutePath(),
            "registrylib"
        });

        theBar.setMessage("");
        theBar.stop();
    }

    /**
     * Verifies that all the dll's that JMF needs are in their correct spot
     * @return True if all dlls are in their correct spot, false otherwise
     */
    public boolean detectDlls()
    {
        boolean retVal = true;
        String currFile;
        for(String currDll : dlls)
        {
            currFile = dir + currDll;
            if(! new File(currFile).exists())
            {
                Window.getLogger().severe("Can not find dll " + currFile + " for JMF");
                retVal = false;
            }
        }
        return retVal;
    }

    //Doesnt work quite yet
    public boolean installLibraryFiles()
    {
        boolean retVal = true;
        String currFile;
        for(String currDll : dlls)
        {
            currFile = dir + currDll;
            File newDll = new File(currFile);
            //see if this dll is already there
            if(!newDll.exists())
            {
                //its not there so lets copy it
                try
                {
                    FileUtilities.copy(newDll,FileUtilities.getResourceFile("/JMFManager/Resources/"+currDll,currDll));
                }
                catch(Exception e)
                {
                    retVal =  false;
                }
            }
        }
        return retVal;
    }

    /**
     * Returns the location of the jmf.properties file that STix is using
     * @return THe locaiton of the JMF properties
     */
    public String getJMFPropertiesFileLocation()
    {
        return Registry.getJMFPropertiesFileLocation();
    }

    /**
     * Returns a list of the audio devices found by JMF
     * @return Returns an Arraylist containing info about the audio capture devices
     */
    public ArrayList getAudioDevices()
    {
        DeviceFinder df = new DeviceFinder();
        audioDevices = df.getSoundCaptureDevices();
        return new ArrayList(audioDevices);
    }

    /**
     * Returns a list of the video decives deteced by JMF
     * @return returns an arraylist with info of the video capture devices
     */
    public ArrayList getVideoDevices()
    {
        DeviceFinder df = new DeviceFinder();
        videoDevices = df.getVideoCaptureDevices();
        return new ArrayList(videoDevices);
    }


    public static void main(String [] args)
    {
        JMFRunner x = new JMFRunner();
        //x.detectCaptureDecives();
        x.installLibraryFiles();
        System.out.println(x.detectDlls());
        System.out.println(x.getJMFPropertiesFileLocation());
        System.out.println(x.getAudioDevices());
        System.out.println(x.getVideoDevices());
    }
}

DeviceFinder.java

import java.util.Vector;
import javax.media.*;
import javax.media.format.*;

/**
 * this class gets information about capture devices (mics and cameras)
 */
public class DeviceFinder {

    Vector videoDevices = new Vector();
    Vector audioDevices = new Vector();

   /**
   * Constructor
   * Creates a new DeviceFinder
   */
   public DeviceFinder()
   {
      /*retrieve ALL video and audio devices*/
      videoDevices = CaptureDeviceManager.getDeviceList(new VideoFormat(null));
      audioDevices = CaptureDeviceManager.getDeviceList(new AudioFormat(null));
   }

   /**
   * purpose:  Get information on all Video capture devices on the system
   * @return java.util.Vector 
 a vector of attributes
   */
   public Vector getVideoCaptureDevices()
   {
      return  videoDevices;
   }


   /**
   * purpose:  Get information on all audio capture devices on the system
   * @return java.util.Vector 
 a vector of attributes
   */
   public Vector getSoundCaptureDevices()
   {
      return audioDevices;
   }


   /**
   * retrieve the first video capture device
   */
   public CaptureDeviceInfo getPrimaryVideoCaptureDevice()
   {
      return (CaptureDeviceInfo)videoDevices.get(0);
   }

   /*retrieve the first audio capture device*/
   public CaptureDeviceInfo getPrimaryAudioCaptureDevice()
   {
      return (CaptureDeviceInfo)audioDevices.get(0);
   }


   /**
   * get the first video device name
   * @return String 
 the name of the video device
   */
   public String getVideoCaptureDeviceName()
   {
      return ((CaptureDeviceInfo)videoDevices.get(0)).getName();
   }


   /**
   * get the first audio device name
   * @return String 
 the name of the audio device
   */
   public String getAudioCaptureDeviceName()
   {
      return ((CaptureDeviceInfo)audioDevices.get(0)).getName();
   }


   /**
   * get the first video device media locator
   * @return MediaLocator
   */
   public MediaLocator getVideoMediaLocator()
   {
      return ((CaptureDeviceInfo)videoDevices.get(0)).getLocator();
   }


   /**
   * get the first audio device media locator
   * @return MediaLocator
   */
   public MediaLocator getAudioMediaLocator()
   {
      return ((CaptureDeviceInfo)audioDevices.get(0)).getLocator();
   }


   /**
   * get the video device media locator at index idx
   * @param idx index of the media locator (0 is the first/default,
    * as ordered by
   * 
the JMFRegistry)
   * @return MediaLocator
   */
   public MediaLocator getVideoMediaLocator(int idx)
   {
      if(idx >= videoDevices.size())
      {
         return null;
      }
      return ((CaptureDeviceInfo)videoDevices.get(idx)).getLocator();
   }


   /**
   * get the audio device media locator at index idx
   * @param idx  index of the audio device (as ordered by the JMFRegistry)
   * @return MediaLocator
   */
   public MediaLocator getAudioMediaLocator(int idx)
   {
      return ((CaptureDeviceInfo)audioDevices.get(idx)).getLocator();
   }


   /**
   *
   * @param args
   */
   public static void main(String[] args)
   {
      DeviceFinder df = new DeviceFinder();
      //DEBUG:
      System.out.println(df.getVideoMediaLocator());
      System.out.println(df.getAudioMediaLocator());
   }
}

Answer 1

我不認為有更好的方法。 除非通過路徑名顯式加載DLL，否則您只需要確保它們位於系統路徑中，因此如果它們位於JVM可執行文件旁邊，它也應該可以工作。 Windows隱式包含程序從系統路徑啟動的目錄，因此這是另一個潛在的位置。

安裝程序是一把雙刃劍，它們可以輕松添加新功能並在以后刪除它，但它們也使得部署使用該產品的解決方案變得更加困難。

一般來說，Java的一個好處就是你不必安裝它才能工作。 基本上，一旦您在一個系統上執行JRE的安裝，您就可以將其捆綁起來並在另一個系統上作為zip文件使用它。 Java不需要顯式注冊DLL，因為它根據需要動態加載它們。