一、前言
在局域网中实现流媒体的播放有2种主要方式，Airplay和DLNA。对于iOS系统，天生带了Airplay，但可惜是苹果秉承一贯的作风，Airplay是一个闭源协议。万幸有大神逆向了协议内容，使得我们可以去搭建服务完成此项工作。这个协议的复杂度还是略高，使得我也不可能一口气写出完整的文章，咱们就一篇篇的道来。
二、让iOS通过AirTurns发现Android设备
Airplay是基于局域网的服务，在相同wifi的内网下，苹果设备会去搜寻支持Airplay服务的设备。
我们可以通过mDNS服务向局域网中发送一个MultiCast广播，这样iOS设备在内网中就可以发现你（Android设备）了。Android可以使用JmDNS这个库来构建相关代码。
- 代码实现
- 1.获取满足条件的本地网络设备接口。去除没有运行的设备，过滤掉回送 、点对点和虚拟接口的，并且去掉不支持MultiCast的设备接口。
for (final NetworkInterface networkInterface : workInterfaces) {
//如果网络设备接口是 回送接口 & 点对点接口 & 没有运行 & 虚拟端口，则跳过执行
if (networkInterface.isLoopback() || networkInterface.isPointToPoint() || !networkInterface.isUp()
|| networkInterface.isVirtual()) {
continue;
}
// 不支持组播 跳过
if (!networkInterface.supportsMulticast()) {
continue;
}
- 2.对于满足条件的设备，选取ipv4和ipv6的端口。
for (final InetAddress address : Collections.list(networkInterface.getInetAddresses())) {
//端口是是ipv4 或者 ipv6 端口
if (address instanceof Inet4Address || address instanceof Inet6Address) {
try {
final JmDNS jmDNS = JmDNS.create(address, hostName);
jmDNSList.add(jmDNS);
- 3.对满足条件的端口号开启 AirTunes/RAOP （远程音频传输协议）服务。
协议常量定义
/**
* The AirTunes/RAOP service type
*/
static final String AIR_TUNES_SERVICE_TYPE = "_raop._tcp.local.";
/**
* The AirTunes/RAOP M-DNS service properties (TXT record)
*/
static final Map<String, String> AIRTUNES_SERVICE_PROPERTIES = NetworkUtils.map(
"txtvers", "1",
"tp", "UDP",
"ch", "2",
"ss", "16",
"sr", "44100",
"pw", "false",
"sm", "false",
"sv", "false",
"ek", "1",
"et", "0,1",
"cn", "0,1",
"vn", "3");
/**
* The AirTunes/RAOP RTSP port
*/
private int rtspPort = 5000; //default value
逻辑代码
final ServiceInfo airTunesServiceInfo = ServiceInfo.create(
AIR_TUNES_SERVICE_TYPE,
hardwareAddressString + "@" + hostName,
getRstpPort(),
0,
0,
AIRTUNES_SERVICE_PROPERTIES
);
jmDNS.registerService(airTunesServiceInfo);
- 4 完整工作线程代码如下
package ss.serven.rduwan.airtunesandroid;
import android.util.Log;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.jmdns.JmDNS;
import javax.jmdns.ServiceInfo;
/**
* Created by rduwan on 17/6/29.
*/
public class AirTunesRunnable implements Runnable {
/**
* The AirTunes/RAOP service type
*/
static final String AIR_TUNES_SERVICE_TYPE = "_raop._tcp.local.";
/**
* The AirTunes/RAOP M-DNS service properties (TXT record)
*/
static final Map<String, String> AIRTUNES_SERVICE_PROPERTIES = NetworkUtils.map(
"txtvers", "1",
"tp", "UDP",
"ch", "2",
"ss", "16",
"sr", "44100",
"pw", "false",
"sm", "false",
"sv", "false",
"ek", "1",
"et", "0,1",
"cn", "0,1",
"vn", "3");
/**
* The AirTunes/RAOP RTSP port
*/
private int rtspPort = 5000; //default value
protected List<JmDNS> jmDNSList;
private static AirTunesRunnable instance = null;
private final static String TAG = "AirTunesRunnable";
private AirTunesRunnable() {
jmDNSList = new java.util.LinkedList<JmDNS>();
}
public synchronized static AirTunesRunnable getInstance() {
if (instance == null) {
instance = new AirTunesRunnable();
}
return instance;
}
@Override
public void run() {
startAirTunesService();
}
private void startAirTunesService() {
Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
@Override
public void run() {
onAppShutDown();
}
}));
sendMulitCastToiOS();
}
/**
* 通过DNS服务给局域网里面的iOS发送组播，使得iOS设备能发现你
* java 使用JmDNS库
*/
private void sendMulitCastToiOS() {
//get Network details
NetworkUtils networkUtils = NetworkUtils.getInstance();
String hostName = "Rduwan-AirTunes";
networkUtils.setHostName(hostName);
String hardwareAddressString = networkUtils.getHardwareAddressString();
try {
synchronized (jmDNSList) {
List<NetworkInterface> workInterfaces = Collections.list(NetworkInterface.getNetworkInterfaces());
for (final NetworkInterface networkInterface : workInterfaces) {
//如果网络设备几口是 回送接口 & 点对点接口 & 没有运行 & 虚拟端口，则跳过执行
if (networkInterface.isLoopback() || networkInterface.isPointToPoint() || !networkInterface.isUp()
|| networkInterface.isVirtual()) {
continue;
}
// 不支持组播 跳过
if (!networkInterface.supportsMulticast()) {
continue;
}
for (final InetAddress address : Collections.list(networkInterface.getInetAddresses())) {
//端口是是ipv4 或者 ipv6 端口
if (address instanceof Inet4Address || address instanceof Inet6Address) {
try {
final JmDNS jmDNS = JmDNS.create(address, hostName);
jmDNSList.add(jmDNS);
//构建AirTunes/RAOP （远程音频传输协议）服务
final ServiceInfo airTunesServiceInfo = ServiceInfo.create(
AIR_TUNES_SERVICE_TYPE,
hardwareAddressString + "@" + hostName,
getRstpPort(),
0,
0,
AIRTUNES_SERVICE_PROPERTIES
);
jmDNS.registerService(airTunesServiceInfo);
Log.d(TAG, "Success to publish service on " + address + ", port: " + getRstpPort());
} catch (final Throwable e) {
Log.e(TAG, "Failed to publish service on " + address, e);
}
}
}
}
}
} catch (Exception e) {
}
}
public int getRstpPort() {
return rtspPort;
}
private void onAppShutDown() {
/* Stop all mDNS responders */
synchronized(jmDNSList) {
for(final JmDNS jmDNS: jmDNSList) {
try {
jmDNS.unregisterAllServices();
Log.i(TAG, "Unregistered all services ");
}
catch (final Exception e) {
Log.i(TAG, "Failed to unregister some services");
}
}
}
}
}
-
5 定义一个Service，启动该线程。在Android设备上运行此程序。在同样wifi下的iOS设备，即可以看到名字叫"RDuwan-AirTunes"的AirTurns服务。
如下图
6 第一部分工程代码见Github链接
