java - 如何使用 Java Media Framework (JMF) 发送 rtcp 再见消息？

Question

我正在使用 Java 应用程序使用 JAIN SIP java API 与 Nuance 语音服务器建立 SIP session 。然后，我通过发送一些 MRCP 命令(例如 GET_PARAMS、SET-PARAMS、定义语法并使用 mrcp4j API 进行识别)来设置系统，为识别做好准备。

然后我使用 JMF api 与语音服务器建立 rtp 和 rtcp session ，以发送音频进行识别。服务器已收到音频，但只有收到 RTCP 再见后才能识别。

但问题是我无法使用 rtcp bye 结束 rtp session ，因为我无法在 JMF 文档中找出解决方法。

如果有人能在这方面指导我，那将会非常有帮助。我已附上 RTP session 的代码。

JMF API 文档的链接是 here

// send Audio data
// create the RTP Manager
RTPManager rtpManager = RTPManager.newInstance();

// create the local endpoint for the local interface on any local port
int port = Integer.parseInt(rtpPORT);;
SessionAddress localAddress = new SessionAddress();      
InetAddress IP = InetAddress.getByName("hydhtc284704d");
localAddress.setControlHostAddress(IP);
localAddress.setControlPort(24501);
localAddress.setDataHostAddress(IP);
localAddress.setDataPort(24500);

// initialize the RTPManager
rtpManager.initialize(localAddress);
//rtpManager.initialize(rtpConnector);

// specify the remote endpoint of this unicast session 
InetAddress ipAddress = InetAddress.getByName("hydhtc227033d");
SessionAddress remoteAddress = new SessionAddress(ipAddress, port, ipAddress, port + 1);

//System.out.println(remoteAddress);
// open the connection
rtpManager.addTarget(remoteAddress);

rtpManager.addSendStreamListener(new SendStreamListener() {
@Override
public void update(SendStreamEvent arg0) {
//System.out.println("Send Stream Event: " + arg0.getSource());
System.out.println("Number of bytes transmitted: " + arg0.getSendStream().getSourceTransmissionStats().getBytesTransmitted());
System.out.println("Sender Report: " + arg0.getSendStream().getSenderReport());
}
});

rtpManager.addReceiveStreamListener(new ReceiveStreamListener() {
@Override
public void update(ReceiveStreamEvent arg0) {
// TODO Auto-generated method stub
}
});


File audioFile = new File("C:\\Users\\Bhanu_Verma\\Desktop\\eclipse\\one.wav");
Processor processor= Manager.createProcessor(audioFile.toURI().toURL());
processor.configure();
// Block until the Processor has been configured

while (processor.getState() != processor.Configured) {
}

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

TrackControl track[] = processor.getTrackControls();
//ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
//processor.setContentDescriptor(cd);
boolean encodingOk = false;
// Go through the tracks and try to program one of them to
// output ulaw data.

    for (int i = 0; i < track.length; i++) {
        if (!encodingOk && track[i] instanceof FormatControl) {
            if (((FormatControl)track[i]).setFormat(new AudioFormat(AudioFormat.ULAW_RTP,8000,8,1)) == null)
            {
                track[i].setEnabled(false);
            }
            else 
            {
                encodingOk = true;
            }
        }
        else 
        {
            // we could not set this track to ulaw, so disable it
            track[i].setEnabled(false);
        }
    }

    // At this point, we have determined where we can send out ulaw data or not.
    // realize the processor

    if (encodingOk) {
        processor.realize();
        // block until realized.

        while (processor.getState() != processor.Realized) {
        }

        // get the output datasource of the processor and exit if we fail
        DataSource dataOutput = processor.getDataOutput();

        // create a send stream for the output data source of a processor and start it

        SendStream sendStream = rtpManager.createSendStream(dataOutput,0);
        sendStream.start();

        System.out.println("Starting processor" + "\n");
        processor.start();


        while(processor.getState()== processor.Started)
        {
            System.out.println("Sending Audio..");
        }

        System.out.println("Processor was started and audio was sent to server");

        Wait(2000);  // waiting so that audio could be given to the server


        // close the connection if no longer needed.
        rtpManager.removeTarget(remoteAddress, "Client disconnected.");

        // call dispose at the end of the life-cycle of this RTPManager so
        // it is prepared to be garbage-collected.
        rtpManager.dispose();  

Answer 1

没有这样明确的方法来使用 JMF 发送 rtcp bye。但当您关闭 SendStream 时，JMF 在内部发送 RTCP bye。

请注意，关闭和停止 SendStream 是不同的。关闭流会删除 session ，而停止 SendStream 仅停止数据传输。要发送 RTCP 再见，只需在发送完媒体后停止处理器并关闭 SendStream。因此，要发送 RTCP 再见，只需将这两行添加到您的代码中即可。

processor.stop();  //processor needs to be stopped as well before closing the sendStream
sendStream.close();