Question

我正在使用xuggler在java中构建RTSP流服务器，但我不确定如何实现正确的RTP打包。

我当前的方法是在输入容器上调用ReadNextPacket(packet)，然后制作一个RTP数据包，其中有效负载由packet.getData()和相应的头填充（有效负载类型基于流索引，时间戳由{{设置） 1}}等，并发送它。

有人能为我提供一个实用示例，说明如何以最依赖输入格式的方式将getTimestamp()编码为正确的rtp有效负载吗？文档有点缺乏。

Answer 1

我见过使用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) {
    }
}
}

如何使用Xuggler在RTP数据包中编码媒体文件

1 个答案: