如何用Xuggler对RTP包中的媒体文件进行编码

Question

我正在用java构建一个RTSP流媒体服务器，但我不确定如何实现正确的RTP打包。

然后发送出去。

谁能给我提供一个实际的例子，告诉我如何以最独立于输入格式的方式将IPacket编码成正确的rtp有效负载？在这方面的文档有点缺乏。

Answer 1

我见过一个使用javax.media实现RTP服务器的代码。

class MediaConvertion {
private MediaLocator mediaLocator = null;

private DataSink dataSink = null;

private Processor mediaProcessor = null;

private static final Format[] FORMATS = new Format[] { new AudioFormat(
        AudioFormat.DVI_RTP) };

private static final ContentDescriptor CONTENT_DESCRIPTOR = new ContentDescriptor(
        ContentDescriptor.RAW_RTP);

public MediaConvertion(String url) throws IOException,
        NoProcessorException, CannotRealizeException, NoDataSinkException,
        NoDataSinkException {
    mediaLocator = new MediaLocator(url);
}

public void setDataSource(DataSource ds) throws IOException,
        NoProcessorException, CannotRealizeException, NoDataSinkException {

    mediaProcessor = Manager.createRealizedProcessor(new ProcessorModel(ds,
            FORMATS, CONTENT_DESCRIPTOR));
    dataSink = Manager.createDataSink(mediaProcessor.getDataOutput(),
            mediaLocator);
}

public void startTransmitting() throws IOException {
    mediaProcessor.start();
    dataSink.open();
    dataSink.start();
}

public void stopTransmitting() throws IOException {
    dataSink.stop();
    dataSink.close();
    mediaProcessor.stop();
    mediaProcessor.close();
}
}

public class MediaConverterExample extends Frame implements ActionListener {

Button st_stream;
static MediaConvertion mdcon;

public static void main(String args[]) throws IOException,
        NoProcessorException, CannotRealizeException, NoDataSinkException,
        MalformedURLException, NoDataSourceException {
    Format input1 = new AudioFormat(AudioFormat.MPEGLAYER3);
    Format input2 = new AudioFormat(AudioFormat.MPEG);
    Format output = new AudioFormat(AudioFormat.LINEAR);
    PlugInManager.addPlugIn("com.sun.media.codec.audio.mp3.JavaDecoder",
            new Format[] { input1, input2 }, new Format[] { output },
            PlugInManager.CODEC);
    File mediaFile = new File(args[1]);
    DataSource source = Manager.createDataSource(new MediaLocator(mediaFile
            .toURL()));
    mdcon = new MediaConvertion(args[0]);
    mdcon.setDataSource(source);
    new MediaConverterExample();
}

public MediaConverterExample() {
    st_stream = new Button("Start Streaming");
    add(st_stream);
    st_stream.addActionListener(this);
    setVisible(true);
    setSize(200, 300);

}

public void actionPerformed(ActionEvent ae) {
    try {
        mdcon.startTransmitting();
    } catch (Exception e) {
    }
}
}