java原生如何发送RTP视频流，怎么设置请求头

Java原生并没有提供发送RTP视频流的相关API，需要通过Socket和UDP实现。下面是一个简单的示例代码，演示如何使用Java原生代码发送RTP视频流，并设置请求头：

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class RTPSender {
    private DatagramSocket socket;
    private InetAddress destinationAddress;
    private int destinationPort;
    private int timestamp = 0;
    private int sequenceNumber = 0;

    public RTPSender(String destinationIPAddress, int destinationPort) throws IOException {
        this.socket = new DatagramSocket();
        this.destinationAddress = InetAddress.getByName(destinationIPAddress);
        this.destinationPort = destinationPort;
    }

    public void sendVideo(byte[] videoData) throws IOException {
        // RTP header
        byte[] rtpHeader = new byte[12];
        // Version: 2
        rtpHeader[0] = (byte) 0x80;
        // Padding: 0
        // Extension: 0
        // CC: 0
        // Marker: 0
        // Payload Type: 96 (H264)
        rtpHeader[1] = (byte) 0x60;
        // Sequence Number
        rtpHeader[2] = (byte) (sequenceNumber >> 8);
        rtpHeader[3] = (byte) (sequenceNumber);
        // Timestamp
        rtpHeader[4] = (byte) (timestamp >> 24);
        rtpHeader[5] = (byte) (timestamp >> 16);
        rtpHeader[6] = (byte) (timestamp >> 8);
        rtpHeader[7] = (byte) (timestamp);
        // Synchronization Source Identifier (SSRC)
        int ssrc = 12345; // 随机生成一个SSRC
        rtpHeader[8] = (byte) (ssrc >> 24);
        rtpHeader[9] = (byte) (ssrc >> 16);
        rtpHeader[10] = (byte) (ssrc >> 8);
        rtpHeader[11] = (byte) (ssrc);
        
        // 将RTP头和视频数据合并为一个数据包
        byte[] packet = new byte[rtpHeader.length + videoData.length];
        System.arraycopy(rtpHeader, 0, packet, 0, rtpHeader.length);
        System.arraycopy(videoData, 0, packet, rtpHeader.length, videoData.length);

        // 发送RTP数据包
        DatagramPacket datagramPacket = new DatagramPacket(packet, packet.length, destinationAddress, destinationPort);
        socket.send(datagramPacket);

        // 更新时间戳和序列号
        timestamp += 90000 / 30; // 时间戳加上帧间隔
        sequenceNumber++;
    }

    public void close() {
        socket.close();
    }

    public static void main(String[] args) throws IOException {
        RTPSender sender = new RTPSender("127.0.0.1", 1234); // 目标IP和端口号
        byte[] videoData = new byte[1024]; // 假设视频数据为1024字节
        sender.sendVideo(videoData);
        sender.close();
    }
}

在上面的示例代码中，我们手动构造了RTP请求头，并将其和视频数据合并为一个数据包，然后通过UDP发送到目标IP和端口号。需要注意的是，这里的时间戳和序列号需要根据实际情况进行设置。