RTSP实例

 

现在位置： 主页 > JAVA博客 > 文章内容

RTSP实例

更新日期：2009-08-06 点击： 8

一. 参考资料
1. 《RTSP简单命令》：http://blog.youkuaiyun.com/feidragon319/archive/2007/08/14/1742357.aspx
2. http://bbs.21eic.com/dispbbs.asp?boardid=15%26amp;Id=22948
3. 《RTSP客户端的Java实现》：http://hi.baidu.com/ssyuan/blog/item/566df6defac1dc5094ee37eb.html

二. RTSP的常用命令与解释
其中C是客户端，S是服务端。
2.1 OPTIONS
C->S: OPTION request //询问S有哪些方法可用
S->C: OPTION response //S回应信息中包括提供的所有可用方法
使用举例：
客户端到服务端：
OPTIONS rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331 RTSP/1.0
Cseq: 1 服务端对OPTIONS的回应：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 1
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD

2.2 DESCRIBE

C->S: DESCRIBE request //要求得到S提供的媒体初始化描述信息
S->C: DESCRIBE response //S回应媒体初始化描述信息，主要是sdp

使用举例：
客户端到服务端：

DESCRIBE rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp RTSP/1.0
Cseq: 2

服务端对OPTIONS的回应：

RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 2
Content - length: 421
Date: Mon, 03 Aug 2009 08 : 21 : 33 GMT
Expires: Mon, 03 Aug 2009 08 : 21 : 33 GMT
Content - Type: application / sdp
x - Accept - Retransmit: our - retransmit
x - Accept - Dynamic - Rate: 1
Content - Base: rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/

v = 0
o = MediaBox 127992 137813 IN IP4 0.0 . 0.0
s = RTSP Session
i = Starv Box Live Cast
c = IN IP4 218.207 . 101.236
t = 0 0
a = range:npt = now -
a = control: *
m = video 0 RTP / AVP 96
b = AS: 20
a = rtpmap: 96 MP4V - ES / 1000
a = fmtp: 96 profile - level - id = 8 ; config = 000001b008000001b5090000010000000120008440fa282c2090a31f; decode_buf = 12586
a = range:npt = now -
a = framerate: 5
a = framesize: 96 176 - 144
a = cliprect: 0 , 0 , 144 , 176
a = control:trackID = 1

2.3 SETUP
C->S: SETUP request //设置会话的属性，以及传输模式，提醒S建立会话
S->C: SETUP response //S建立会话，返回会话标识符，以及会话相关信息
客户端到服务端的请求举例：

SETUP rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/trackID=1
RTSP / 1.0
Cseq: 3
Transport: RTP / AVP;UNICAST;client_port = 16264 - 16265 ;mode = play

服务端对客户端的回应举例：

RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 3
Session: 26633092229589
Date: Mon, 03 Aug 2009 08 : 21 : 33 GMT
Expires: Mon, 03 Aug 2009 08 : 21 : 33 GMT
Transport: RTP / AVP;UNICAST;mode = play;client_port = 16264 - 16265 ;server_port = 20026 - 20027

2.4 PLAY
C->S: PLAY request //C请求播放
S->C: PLAY response //S回应该请求的信息
客户端到服务端的请求举例:

PLAY rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp RTSP/1.0
Session: 26633092229589
Cseq: 4

服务端对客户端的回应举例：

RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 4
Session: 26633092229589
RTP - Info: url = rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/trackID=1;seq=0;rtptime=0

2.5 PAUSE
C->S: PAUSE request //C请求暂停播放
S->C: PAUSE response //S回应该请求的信息
客户端到服务端的请求举例:

PAUSE rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/ RTSP/1.0
Cseq: 5
Session: 26633092229589

服务端对客户端的回应举例：

RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 5
Session: 26633092229589

2.6 TEARDOWN
C->S: TEARDOWN request //C请求关闭会话
S->C: TEARDOWN response //S回应该请求
客户端到服务端的请求举例:

TEARDOWN rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/ RTSP/1.0
Cseq: 6
User - Agent: RealMedia Player HelixDNAClient / 10.0 . 0.11279 (win32)
Session: 26633092229589

服务端对客户端的回应举例：

RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 6
Session: 26633092229589
Connection: Close

三. RTSP客户端的Java实现
3.1 接口IEvent.java

接口IEvent.java的代码如下：
package com.amigo.rtsp;

import java.io.IOException;
import java.nio.channels.SelectionKey;

/** */ /**
* IEvent.java 网络事件处理器，当Selector可以进行操作时，调用这个接口中的方法.
* 2007-3-22 下午03:35:51
* %26#64;author sycheng
* %26#64;version 1.0
*/
public interface IEvent {
/** */ /**
* 当channel得到connect事件时调用这个方法.
* %26#64;param key
* %26#64;throws IOException
*/
void connect(SelectionKey key) throws IOException;

/** */ /**
* 当channel可读时调用这个方法.
* %26#64;param key
* %26#64;throws IOException
*/
void read(SelectionKey key) throws IOException;

/** */ /**
* 当channel可写时调用这个方法.
* %26#64;throws IOException
*/
void write() throws IOException;

/** */ /**
* 当channel发生错误时调用.
* %26#64;param e
*/
void error(Exception e);
}
3.2 RTSP的测试类：RTSPClient.java
RTSP的测试类RTSPClient.java类的代码如下所示:
package com.amigo.rtsp;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.concurrent.atomic.AtomicBoolean;

public class RTSPClient extends Thread implements IEvent {

private static final String VERSION = " RTSP/1.0/r/n " ;
private static final String RTSP_OK = " RTSP/1.0 200 OK " ;

/** */ /** 远程地址 */
private final InetSocketAddress remoteAddress;

/** */ /** * 本地地址 */
private final InetSocketAddress localAddress;

/** */ /** * 连接通道 */
private SocketChannel socketChannel;

/** */ /** 发送缓冲区 */
private final ByteBuffer sendBuf;

/** */ /** 接收缓冲区 */
private final ByteBuffer receiveBuf;

private static final int BUFFER_SIZE = 8192 ;

/** */ /** 端口选择器 */
private Selector selector;

private String address;

private Status sysStatus;

private String sessionid;

/** */ /** 线程是否结束的标志 */
private AtomicBoolean shutdown;

private int seq = 1 ;

private boolean isSended;

private String trackInfo;


private enum Status {
init, options, describe, setup, play, pause, teardown
}

public RTSPClient(InetSocketAddress remoteAddress,
InetSocketAddress localAddress, String address) {
this .remoteAddress = remoteAddress;
this .localAddress = localAddress;
this .address = address;

// 初始化缓冲区
sendBuf = ByteBuffer.allocateDirect(BUFFER_SIZE);
receiveBuf = ByteBuffer.allocateDirect(BUFFER_SIZE);
if (selector == null ) {
// 创建新的Selector
try {
selector = Selector.open();
} catch ( final IOException e) {
e.printStackTrace();
}
}

startup();
sysStatus = Status.init;
shutdown = new AtomicBoolean( false );
isSended = false ;
}

public void startup() {
try {
// 打开通道
socketChannel = SocketChannel.open();
// 绑定到本地端口
socketChannel.socket().setSoTimeout( 30000 );
socketChannel.configureBlocking( false );
socketChannel.socket().bind(localAddress);
if (socketChannel.connect(remoteAddress)) {
System.out.println( " 开始建立连接: " + remoteAddress);
}
socketChannel.register(selector, SelectionKey.OP_CONNECT
| SelectionKey.OP_READ | SelectionKey.OP_WRITE, this );
System.out.println( " 端口打开成功 " );

} catch ( final IOException e1) {
e1.printStackTrace();
}
}

public void send( byte [] out) {
if (out == null || out.length < 1 ) {
return ;
}
synchronized (sendBuf) {
sendBuf.clear();
sendBuf.put(out);
sendBuf.flip();
}

// 发送出去
try {
write();
isSended = true ;
} catch ( final IOException e) {
e.printStackTrace();
}
}

public void write() throws IOException {
if (isConnected()) {
try {
socketChannel.write(sendBuf);
} catch ( final IOException e) {
}
} else {
System.out.println( " 通道为空或者没有连接上 " );
}
}

public byte [] recieve() {
if (isConnected()) {
try {
int len = 0 ;
int readBytes = 0 ;

synchronized (receiveBuf) {
receiveBuf.clear();
try {
while ((len = socketChannel.read(receiveBuf)) > 0 ) {
readBytes += len;
}
} finally {
receiveBuf.flip();
}
if (readBytes > 0 ) {
final byte [] tmp = new byte [readBytes];
receiveBuf.get(tmp);
return tmp;
} else {
System.out.println( " 接收到数据为空,重新启动连接 " );
return null ;
}
}
} catch ( final IOException e) {
System.out.println( " 接收消息错误: " );
}
} else {
System.out.println( " 端口没有连接 " );
}
return null ;
}

public boolean isConnected() {
return socketChannel != null %26amp;%26amp; socketChannel.isConnected();
}

private void select() {
int n = 0 ;
try {
if (selector == null ) {
return ;
}
n = selector.select( 1000 );

} catch ( final Exception e) {
e.printStackTrace();
}

// 如果select返回大于0，处理事件
if (n > 0 ) {
for ( final Iterator < SelectionKey > i = selector.selectedKeys()
.iterator(); i.hasNext();) {
// 得到下一个Key
final SelectionKey sk = i.next();
i.remove();
// 检查其是否还有效
if ( ! sk.isValid()) {
continue ;
}

// 处理事件
final IEvent handler = (IEvent) sk.attachment();
try {
if (sk.isConnectable()) {
handler.connect(sk);
} else if (sk.isReadable()) {
handler.read(sk);
} else {
// System.err.println("Ooops");
}
} catch ( final Exception e) {
handler.error(e);
sk.cancel();
}
}
}
}

public void shutdown() {
if (isConnected()) {
try {
socketChannel.close();
System.out.println( " 端口关闭成功 " );
} catch ( final IOException e) {
System.out.println( " 端口关闭错误: " );
} finally {
socketChannel = null ;
}
} else {
System.out.println( " 通道为空或者没有连接 " );
}
}

%26#64;Override
public void run() {
// 启动主循环流程
while ( ! shutdown.get()) {
try {
if (isConnected() %26amp;%26amp; ( ! isSended)) {
switch (sysStatus) {
case init:
doOption();
break ;
case options:
doDescribe();
break ;
case describe:
doSetup();
break ;
case setup:
if (sessionid == null %26amp;%26amp; sessionid.length() > 0 ) {
System.out.println( " setup还没有正常返回 " );
} else {
doPlay();
}
break ;
case play:
doPause();
break ;

case pause:
doTeardown();
break ;
default :
break ;
}
}
// do select
select();
try {
Thread.sleep( 1000 );
} catch ( final Exception e) {
}
} catch ( final Exception e) {
e.printStackTrace();
}
}

shutdown();
}

public void connect(SelectionKey key) throws IOException {
if (isConnected()) {
return ;
}
// 完成SocketChannel的连接
socketChannel.finishConnect();
while ( ! socketChannel.isConnected()) {
try {
Thread.sleep( 300 );
} catch ( final InterruptedException e) {
e.printStackTrace();
}
socketChannel.finishConnect();
}

}

public void error(Exception e) {
e.printStackTrace();
}

public void read(SelectionKey key) throws IOException {
// 接收消息
final byte [] msg = recieve();
if (msg != null ) {
handle(msg);
} else {
key.cancel();
}
}

private void handle( byte [] msg) {
String tmp = new String(msg);
System.out.println( " 返回内容： " );
System.out.println(tmp);
if (tmp.startsWith(RTSP_OK)) {
switch (sysStatus) {
case init:
sysStatus = Status.options;
break ;
case options:
sysStatus = Status.describe;
trackInfo = tmp.substring(tmp.indexOf( " trackID " ));
break ;
case describe:
sessionid = tmp.substring(tmp.indexOf( " Session: " ) + 9 , tmp
.indexOf( " Date: " ));
if (sessionid != null %26amp;%26amp; sessionid.length() > 0 ) {
sysStatus = Status.setup;
}
break ;
case setup:
sysStatus = Status.play;
break ;
case play:
sysStatus = Status.pause;
break ;
case pause:
sysStatus = Status.teardown;
shutdown.set( true );
break ;
case teardown:
sysStatus = Status.init;
break ;
default :
break ;
}
isSended = false ;
} else {
System.out.println( " 返回错误： " + tmp);
}

}

private void doTeardown() {
StringBuilder sb = new StringBuilder();
sb.append( " TEARDOWN " );
sb.append( this .address);
sb.append( " / " );
sb.append(VERSION);
sb.append( " Cseq: " );
sb.append(seq ++ );
sb.append( " /r/n " );
sb.append( " User-Agent: RealMedia Player HelixDNAClient/10.0.0.11279 (win32)/r/n " );
sb.append( " Session: " );
sb.append(sessionid);
sb.append( " /r/n " );
send(sb.toString().getBytes());
System.out.println(sb.toString());
}

private void doPlay() {
StringBuilder sb = new StringBuilder();
sb.append( " PLAY " );
sb.append( this .address);
sb.append(VERSION);
sb.append( " Session: " );
sb.append(sessionid);
sb.append( " Cseq: " );
sb.append(seq ++ );
sb.append( " /r/n " );
sb.append( " /r/n " );
System.out.println(sb.toString());
send(sb.toString().getBytes());

}

private void doSetup() {
StringBuilder sb = new StringBuilder();
sb.append( " SETUP " );
sb.append( this .address);
sb.append( " / " );
sb.append(trackInfo);
sb.append(VERSION);
sb.append( " Cseq: " );
sb.append(seq ++ );
sb.append( " /r/n " );
sb.append( " Transport: RTP/AVP;UNICAST;client_port=16264-16265;mode=play/r/n " );
sb.append( " /r/n " );
System.out.println(sb.toString());
send(sb.toString().getBytes());
}

private void doOption() {
StringBuilder sb = new StringBuilder();
sb.append( " OPTIONS " );
sb.append( this .address.substring( 0 , address.lastIndexOf( " / " )));
sb.append(VERSION);
sb.append( " Cseq: " );
sb.append(seq ++ );
sb.append( " /r/n " );
sb.append( " /r/n " );
System.out.println(sb.toString());
send(sb.toString().getBytes());
}

private void doDescribe() {
StringBuilder sb = new StringBuilder();
sb.append( " DESCRIBE " );
sb.append( this .address);
sb.append(VERSION);
sb.append( " Cseq: " );
sb.append(seq ++ );
sb.append( " /r/n " );
sb.append( " /r/n " );
System.out.println(sb.toString());
send(sb.toString().getBytes());
}

private void doPause() {
StringBuilder sb = new StringBuilder();
sb.append( " PAUSE " );
sb.append( this .address);
sb.append( " / " );
sb.append(VERSION);
sb.append( " Cseq: " );
sb.append(seq ++ );
sb.append( " /r/n " );
sb.append( " Session: " );
sb.append(sessionid);
sb.append( " /r/n " );
send(sb.toString().getBytes());
System.out.println(sb.toString());
}

public static void main(String[] args) {
try {
// RTSPClient(InetSocketAddress remoteAddress,
// InetSocketAddress localAddress, String address)
RTSPClient client = new RTSPClient(
new InetSocketAddress( " 218.207.101.236 " , 554 ),
new InetSocketAddress( " 192.168.2.28 " , 0 ),
" rtsp://218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp " );
client.start();
} catch (Exception e) {
e.printStackTrace();
}
}
}
其中:rtsp://218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp为我在网上找到的一个rtsp的sdp地址,读者可自行更换,RTSP的默认端口为554.
3.3 运行结果
运行RTSPClient.java,运行结果如下所示:
端口打开成功
OPTIONS rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331 RTSP/1.0
Cseq: 1


返回内容：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 1
Public: DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, OPTIONS, ANNOUNCE, RECORD


DESCRIBE rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp RTSP/1.0
Cseq: 2


返回内容：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 2
Content - length: 421
Date: Mon, 03 Aug 2009 08 : 50 : 36 GMT
Expires: Mon, 03 Aug 2009 08 : 50 : 36 GMT
Content - Type: application / sdp
x - Accept - Retransmit: our - retransmit
x - Accept - Dynamic - Rate: 1
Content - Base: rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/

v = 0
o = MediaBox 127992 137813 IN IP4 0.0 . 0.0
s = RTSP Session
i = Starv Box Live Cast
c = IN IP4 218.207 . 101.236
t = 0 0
a = range:npt = now -
a = control: *
m = video 0 RTP / AVP 96
b = AS: 20
a = rtpmap: 96 MP4V - ES / 1000
a = fmtp: 96 profile - level - id = 8 ; config = 000001b008000001b5090000010000000120008440fa282c2090a31f; decode_buf = 12586
a = range:npt = now -
a = framerate: 5
a = framesize: 96 176 - 144
a = cliprect: 0 , 0 , 144 , 176
a = control:trackID = 1

SETUP rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/trackID=1
RTSP / 1.0
Cseq: 3
Transport: RTP / AVP;UNICAST;client_port = 16264 - 16265 ;mode = play


返回内容：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 3
Session: 15470472221769
Date: Mon, 03 Aug 2009 08 : 50 : 36 GMT
Expires: Mon, 03 Aug 2009 08 : 50 : 36 GMT
Transport: RTP / AVP;UNICAST;mode = play;client_port = 16264 - 16265 ;server_port = 20080 - 20081


PLAY rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp RTSP/1.0
Session: 15470472221769
Cseq: 4


返回内容：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 4
Session: 15470472221769
RTP - Info: url = rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/trackID=1;seq=0;rtptime=0


PAUSE rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/ RTSP/1.0
Cseq: 5
Session: 15470472221769


返回内容：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 5
Session: 15470472221769


TEARDOWN rtsp: // 218.207.101.236:554/mobile/3/67A451E937422331/8jH5QPU5GWS07Ugn.sdp/ RTSP/1.0
Cseq: 6
User - Agent: RealMedia Player HelixDNAClient / 10.0 . 0.11279 (win32)
Session: 15470472221769


返回内容：
RTSP / 1.0 200 OK
Server: PVSS / 1.4 . 8 (Build / 20090111 ; Platform / Win32; Release / StarValley; )
Cseq: 6
Session: 15470472221769
Connection: Close


端口关闭成功

对照运行结果,读者可以熟悉RTSP的常用命令.