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60 lines
1.6 KiB
60 lines
1.6 KiB
package com.inspect.tcpserver.sip.gb28181;
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import java.net.*;
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import java.util.concurrent.atomic.AtomicInteger;
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public class RtpSender {
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private static final int RTP_HEADER_SIZE = 12;
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private static final int MTU = 1400;
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private final DatagramSocket socket;
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private final InetAddress remote;
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private final int port;
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private final int ssrc;
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private final AtomicInteger seq = new AtomicInteger(0);
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private int timestamp = 0;
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public RtpSender(DatagramSocket socket, InetAddress remote, int port, int ssrc) {
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this.socket = socket;
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this.remote = remote;
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this.port = port;
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this.ssrc = ssrc;
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}
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public void send(byte[] ps, boolean marker) throws Exception {
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int offset = 0;
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while (offset < ps.length) {
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int size = Math.min(MTU, ps.length - offset);
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byte[] pkt = new byte[RTP_HEADER_SIZE + size];
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pkt[0] = (byte) 0x80;
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pkt[1] = (byte) (96 | (marker ? 0x80 : 0x00));
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pkt[2] = (byte) (seq.get() >> 8);
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pkt[3] = (byte) (seq.getAndIncrement());
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timestamp += 3600;
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pkt[4] = (byte) (timestamp >> 24);
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pkt[5] = (byte) (timestamp >> 16);
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pkt[6] = (byte) (timestamp >> 8);
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pkt[7] = (byte) (timestamp);
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pkt[8] = (byte) (ssrc >> 24);
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pkt[9] = (byte) (ssrc >> 16);
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pkt[10] = (byte) (ssrc >> 8);
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pkt[11] = (byte) (ssrc);
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System.arraycopy(ps, offset, pkt, RTP_HEADER_SIZE, size);
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socket.send(new DatagramPacket(pkt, pkt.length, remote, port));
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offset += size;
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}
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}
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}
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