一、前言
在局域網(wǎng)中實(shí)現(xiàn)流媒體的播放有2種主要方式，Airplay和DLNA。對于iOS系統(tǒng)，天生帶了Airplay，但可惜是蘋果秉承一貫的作風(fēng)，Airplay是一個閉源協(xié)議。萬幸有大神逆向了協(xié)議內(nèi)容，使得我們可以去搭建服務(wù)完成此項(xiàng)工作。這個協(xié)議的復(fù)雜度還是略高，使得我也不可能一口氣寫出完整的文章，咱們就一篇篇的道來。
二、讓iOS通過AirTurns發(fā)現(xiàn)Android設(shè)備
Airplay是基于局域網(wǎng)的服務(wù)，在相同wifi的內(nèi)網(wǎng)下，蘋果設(shè)備會去搜尋支持Airplay服務(wù)的設(shè)備。
我們可以通過mDNS服務(wù)向局域網(wǎng)中發(fā)送一個MultiCast廣播，這樣iOS設(shè)備在內(nèi)網(wǎng)中就可以發(fā)現(xiàn)你（Android設(shè)備）了。Android可以使用JmDNS這個庫來構(gòu)建相關(guān)代碼。
- 代碼實(shí)現(xiàn)
- 1.獲取滿足條件的本地網(wǎng)絡(luò)設(shè)備接口。去除沒有運(yùn)行的設(shè)備，過濾掉回送 、點(diǎn)對點(diǎn)和虛擬接口的，并且去掉不支持MultiCast的設(shè)備接口。
for (final NetworkInterface networkInterface : workInterfaces) {
//如果網(wǎng)絡(luò)設(shè)備接口是 回送接口 & 點(diǎn)對點(diǎn)接口 & 沒有運(yùn)行 & 虛擬端口，則跳過執(zhí)行
if (networkInterface.isLoopback() || networkInterface.isPointToPoint() || !networkInterface.isUp()
|| networkInterface.isVirtual()) {
continue;
}
// 不支持組播 跳過
if (!networkInterface.supportsMulticast()) {
continue;
}
- 2.對于滿足條件的設(shè)備，選取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.對滿足條件的端口號開啟 AirTunes/RAOP （遠(yuǎn)程音頻傳輸協(xié)議）服務(wù)。
協(xié)議常量定義
/**
* 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
邏輯代碼
final ServiceInfo airTunesServiceInfo = ServiceInfo.create(
AIR_TUNES_SERVICE_TYPE,
hardwareAddressString + "@" + hostName,
getRstpPort(),
0,
0,
AIRTUNES_SERVICE_PROPERTIES
);
jmDNS.registerService(airTunesServiceInfo);
- 4 完整工作線程代碼如下
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();
}
/**
* 通過DNS服務(wù)給局域網(wǎng)里面的iOS發(fā)送組播，使得iOS設(shè)備能發(fā)現(xiàn)你
* java 使用JmDNS庫
*/
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) {
//如果網(wǎng)絡(luò)設(shè)備幾口是 回送接口 & 點(diǎn)對點(diǎn)接口 & 沒有運(yùn)行 & 虛擬端口，則跳過執(zhí)行
if (networkInterface.isLoopback() || networkInterface.isPointToPoint() || !networkInterface.isUp()
|| networkInterface.isVirtual()) {
continue;
}
// 不支持組播 跳過
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);
//構(gòu)建AirTunes/RAOP （遠(yuǎn)程音頻傳輸協(xié)議）服務(wù)
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 定義一個Service，啟動該線程。在Android設(shè)備上運(yùn)行此程序。在同樣wifi下的iOS設(shè)備，即可以看到名字叫"RDuwan-AirTunes"的AirTurns服務(wù)。
如下圖
6 第一部分工程代碼見Github鏈接
