Java怎么把pcm音频封包rtp
时间: 2024-05-13 08:17:50 浏览: 14
要将PCM音频封装成RTP数据包,需要进行以下步骤:
1. 将PCM音频数据编码成所需的音频格式,如G.711、G.729等。
2. 将编码后的音频数据按照RTP协议进行封装,包括设置RTP头部信息、序列号、时间戳等。
3. 在RTP头部中设置SSRC(同步信源标识符),以便接收方可以识别发送方。
4. 设置payload type(载荷类型),对于不同的音频格式,需要设置不同的payload type。
以下是一个简单的Java程序示例,演示了如何将PCM音频封装成RTP数据包:
```java
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class RTPPacketizer {
private static final int RTP_HEADER_SIZE = 12;
private static final int PAYLOAD_TYPE = 0; // G.711 payload type
private static final int SAMPLE_RATE = 8000;
private static final int PACKET_SIZE = 160;
private static final int BUFFER_SIZE = RTP_HEADER_SIZE + PACKET_SIZE;
private DatagramSocket socket;
private InetAddress destAddress;
private int destPort;
private int sequenceNumber = 0;
private long timestamp = 0;
public RTPPacketizer(String destIP, int destPort) throws Exception {
this.socket = new DatagramSocket();
this.destAddress = InetAddress.getByName(destIP);
this.destPort = destPort;
}
public void send(byte[] data) throws Exception {
int payloadLength = data.length;
byte[] buffer = new byte[BUFFER_SIZE];
int offset = 0;
// RTP header
buffer[offset++] = (byte)0x80; // version: 2, padding: 0, extension: 0, CSRC count: 0
buffer[offset++] = (byte)(PAYLOAD_TYPE | 0x80); // marker: 0, payload type: G.711 (PCMU)
buffer[offset++] = (byte)(sequenceNumber >> 8); // sequence number (high byte)
buffer[offset++] = (byte)(sequenceNumber & 0xff); // sequence number (low byte)
buffer[offset++] = (byte)(timestamp >> 24); // timestamp (high byte)
buffer[offset++] = (byte)(timestamp >> 16); // timestamp
buffer[offset++] = (byte)(timestamp >> 8); // timestamp
buffer[offset++] = (byte)(timestamp & 0xff); // timestamp (low byte)
buffer[offset++] = 0; // SSRC (high byte)
buffer[offset++] = 0; // SSRC
buffer[offset++] = 0; // SSRC
buffer[offset++] = 0; // SSRC (low byte)
// payload
System.arraycopy(data, 0, buffer, offset, payloadLength);
DatagramPacket packet = new DatagramPacket(buffer, BUFFER_SIZE, destAddress, destPort);
socket.send(packet);
sequenceNumber++;
timestamp += (PACKET_SIZE * 1000) / SAMPLE_RATE;
}
}
```
在上面的代码中,我们使用了一个`RTPPacketizer`类来进行封包操作。在构造函数中传入目标IP地址和端口号。`send`方法接受一个byte数组作为输入参数,将其封装成RTP数据包并发送至目标地址。
需要注意的是,这里只是一个简单的示例程序,实际使用中还需要进行更多的错误处理、异常处理等操作。
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