Java rtmp播放

Java rtmp播放

在现代的互联网应用中，视频流的传输和播放已经成为了一种常见的需求。其中，RTMP（Real-Time Messaging Protocol）是一种流媒体传输协议，它常用于音视频直播和点播。在Java中，我们可以使用一些开源库来实现RTMP播放功能。本文将介绍如何在Java中使用一个常用的开源库来实现RTMP播放，并提供相应代码示例。

RTMP播放库

在Java中，有许多开源库可以用来实现RTMP播放功能，比如[flazr](

安装flazr库

首先，我们需要在项目中引入flazr库。你可以在Maven中添加以下依赖项：

<dependency>
    <groupId>org.red5</groupId>
    <artifactId>flazr</artifactId>
    <version>0.5.4</version>
</dependency>

或者，你可以从flazr的GitHub仓库中下载JAR文件，并将其添加到项目的构建路径中。

RTMP播放示例

下面是一个简单的RTMP播放示例，通过flazr库来实现：

import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.red5.io.utils.HexDump;

import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

public class RtmpPlayer {
    
    private static final String RTMP_URL = "rtmp://example.com/live/stream";
    
    public static void main(String[] args) throws Exception {
        ClientBootstrap bootstrap = new ClientBootstrap(
                new NioClientSocketChannelFactory(
                        Executors.newCachedThreadPool(),
                        Executors.newCachedThreadPool()
                )
        );
        
        final RtmpHandler rtmpHandler = new RtmpHandler();
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() {
                return Channels.pipeline(rtmpHandler);
            }
        });
        
        ChannelFuture future = bootstrap.connect(new InetSocketAddress("example.com", 1935));
        future.awaitUninterruptibly();
        if (!future.isSuccess()) {
            bootstrap.releaseExternalResources();
            return;
        }
        Channel channel = future.getChannel();
        
        // 开始RTMP握手
        rtmpHandler.handshake(channel);
        
        // 发送连接命令
        rtmpHandler.connect(channel, RTMP_URL);
        
        // 接收音视频流数据
        rtmpHandler.play(channel);
        
        Thread.sleep(30000);
        
        // 停止播放并关闭连接
        rtmpHandler.stop(channel);
        channel.close();
        
        bootstrap.releaseExternalResources();
    }
    
    private static class RtmpHandler extends SimpleChannelUpstreamHandler {
        
        private static final String CRLF = "\r\n";
        
        private void handshake(Channel channel) {
            ChannelBuffer buffer = ChannelBuffers.buffer(1537);
            buffer.writeByte(0x03);
            for (int i = 0; i < 1536; i++) {
                buffer.writeByte(0);
            }
            channel.write(buffer);
        }
        
        private void connect(Channel channel, String rtmpUrl) {
            String tcUrl = rtmpUrl.substring(0, rtmpUrl.lastIndexOf("/"));
            String stream = rtmpUrl.substring(rtmpUrl.lastIndexOf("/") + 1);
            String connectCommand = "connect " + tcUrl + CRLF +
                    "Content-Type: application/x-fcs" + CRLF +
                    "app: " + tcUrl + CRLF +
                    "tcUrl: " + tcUrl + CRLF +
                    "swfUrl: null" + CRLF +
                    "flashVer: FCS/1,0,0,0" + CRLF +
                    "fpad: false" + CRLF +
                    "capabilities: 31" + CRLF +
                    "audioCodecs: 3191" + CRLF +
                    "videoCodecs: 252" + CRLF +
                    "videoFunction: 1" + CRLF;
            ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(connectCommand.getBytes());
            channel.write(buffer);
        }
        
        private void play(Channel channel) {
            String playCommand = "play" + CRLF +
                    "stream: " + CRLF +
                    "start: -2" + CRLF +
                    "duration: -1" + CRLF +
                    "reset: true" + CRLF +
                    "streamName: " + CRLF;
            ChannelBuffer buffer = ChannelBuffers.wrappedBuffer(play