java - 在 FMJ 中找不到捕获设备

Question

之前我一直在使用 JMF，但是需要安装 JMF，但我不想增加这个开销。这就是我想转到 FMJ 的原因。 FMJ 是开源的。 :)

FMJ 源代码给出了一些示例。还有一个 FMJStudio，我可以从那里运行和传输从麦克风捕获的 RTP 音频。

但是当我想使用下面的源传输 RTP 时，它找不到任何捕获设备。

完整的源代码可以在:fmj-20070928-0938_2.zip 中找到 FMJ而这个源类的类名是SimpleVoiceTransmiter。

    //final String urlStr = URLUtils.createUrlStr(new File("samplemedia/gulp2.wav"));//"file://samplemedia/gulp2.wav";
    Format format;

    format = new AudioFormat(AudioFormat.ULAW_RTP, 8000, 8, 1);
    //format = new AudioFormat(AudioFormat.ULAW_RTP, 8000.0, 8, 1, AudioFormat.LITTLE_ENDIAN, AudioFormat.SIGNED);
    //format = new AudioFormat(BonusAudioFormatEncodings.ALAW_RTP, 8000, 8, 1);
    //format = new AudioFormat(BonusAudioFormatEncodings.SPEEX_RTP, 8000, 8, 1, -1, AudioFormat.SIGNED);
    //format = new AudioFormat(BonusAudioFormatEncodings.ILBC_RTP, 8000.0, 16, 1, AudioFormat.LITTLE_ENDIAN, AudioFormat.SIGNED);

    CaptureDeviceInfo di = null;
            //Set to true if you want to transmit audio from capture device, like microphone.
    if (true)
    {
        // First find a capture device that will capture linear audio
        // data at 8bit 8Khz
        AudioFormat captureFormat = new AudioFormat(AudioFormat.LINEAR, 8000, 8, 1);

        Vector devices = CaptureDeviceManager.getDeviceList(captureFormat);



        if (devices.size() > 0)
        {
            di = (CaptureDeviceInfo) devices.elementAt(0);
        } else
        {
            System.err.println("No capture devices");
            // exit if we could not find the relevant capturedevice.
            System.exit(-1);

        }
    }

    // Create a processor for this capturedevice & exit if we
    // cannot create it
    Processor processor = null;
    try
    {
        //processor = Manager.createProcessor(new MediaLocator(urlStr));
                    processor = Manager.createProcessor(di.getLocator());
    } catch (IOException e)
    {
        e.printStackTrace();
        System.exit(-1);
    } catch (NoProcessorException e)
    {
        e.printStackTrace();
        System.exit(-1);
    }

    // configure the processor
    processor.configure();

    while (processor.getState() != Processor.Configured)
    {
        try
        {
            Thread.sleep(10);
        } catch (InterruptedException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    processor.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW_RTP));

    TrackControl track[] = processor.getTrackControls();

    boolean encodingOk = false;

    // Go through the tracks and try to program one of them to
    // output g.711 data.

    for (int i = 0; i < track.length; i++)
    {
        if (!encodingOk && track[i] instanceof FormatControl)
        {
            if (((FormatControl) track[i]).setFormat(format) == null)
            {

                track[i].setEnabled(false);
            } else
            {
                encodingOk = true;
            }
        } else
        {
            // we could not set this track to g.711, so disable it
            track[i].setEnabled(false);
        }
    }

    // At this point, we have determined where we can send out
    // g.711 data or not.
    // realize the processor
    if (encodingOk)
    {
        if (!new net.sf.fmj.ejmf.toolkit.util.StateWaiter(processor).blockingRealize())
        {
            System.err.println("Failed to realize");
            return;
        }

        // get the output datasource of the processor and exit
        // if we fail
        DataSource ds = null;

        try
        {
            ds = processor.getDataOutput();
        } catch (NotRealizedError e)
        {
            e.printStackTrace();
            System.exit(-1);
        }

        // hand this datasource to manager for creating an RTP
        // datasink our RTP datasink will multicast the audio
        try
        {
            String url = "rtp://192.168.1.99:49150/audio/1";

            MediaLocator m = new MediaLocator(url);

            DataSink d = Manager.createDataSink(ds, m);
            d.open();
            d.start();

            System.out.println("Starting processor");
            processor.start();
            Thread.sleep(30000);
        } catch (Exception e)
        {
            e.printStackTrace();
            System.exit(-1);
        }
    }

当我运行这个源时，输出是:No capture devices

可能是什么问题？ :-(

编辑:我从系统中卸载了 JMF。

Answer 1

好吧，过了两天半，摸不着头脑，我自己指出了问题。

问题是，当我卸载 JMF 时，它并未从 CLASSPATH 用户变量中删除。有这样的东西:

  "C:\PROGRA~1\JMF21~1.1E\lib\sound.jar;C:\PROGRA~1\JMF21~1.1E\lib\jmf.jar;C:\PROGRA~1\JMF21~1.1E\lib;"

当我删除它们并重新启动计算机时。然后宾果游戏。代码运行没有任何问题。 :)