如何使用Android在java中播放来自IP的声音

Question

我想使用1.1 mbs数据速率的无线电以太网链路在山谷中的工作室从山顶运行一个广播电台。下面是我找到的示例代码(如下(。

但我希望代码：

1. 加载包含IPv4 IP地址的文本文件以接收声音
2. 从文件中读取一个true或false从android重新传输给另一个接收保存数据的缓慢连接

有人能帮忙吗？

import java.io.IOException;
import java.util.Vector;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.DataSink;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.media.NoProcessorException;
import javax.media.NotRealizedError;
import javax.media.Player;
import javax.media.Processor;
import javax.media.control.FormatControl;
import javax.media.control.TrackControl;
import javax.media.format.AudioFormat;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.DataSource;
public class SimpleVoiceTransmiter {
/**
* @param args
*/
public static void main(String[] args) {
// First find a capture device that will capture linear audio
// data at 8bit 8Khz
AudioFormat format= new AudioFormat(AudioFormat.LINEAR, 8000, 8, 1);
Vector devices= CaptureDeviceManager.getDeviceList( format);
CaptureDeviceInfo di= null;
if (devices.size() > 0) {
di = (CaptureDeviceInfo) devices.elementAt( 0);
}
else {
// exit if we could not find the relevant capturedevice.
System.exit(-1);
}
// Create a processor for this capturedevice & exit if we
// cannot create it
Processor processor = null;
try {
processor = Manager.createProcessor(di.getLocator());
} catch (IOException e) {
System.exit(-1);
} catch (NoProcessorException e) {
System.exit(-1);
}
// configure the processor 
processor.configure();
while (processor.getState() != Processor.Configured){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
processor.setContentDescriptor(
new ContentDescriptor( ContentDescriptor.RAW));
TrackControl track[] = processor.getTrackControls();
boolean encodingOk = false;
// Go through the tracks and try to program one of them to
// output gsm data.
for (int i = 0; i < track.length; i++) {
if (!encodingOk && track[i] instanceof FormatControl) { 
if (((FormatControl)track[i]).
setFormat( new AudioFormat(AudioFormat.GSM_RTP, 8000, 8, 1)) == null) {
track[i].setEnabled(false);
}
else {
encodingOk = true;
}
} else {
// we could not set this track to gsm, so disable it
track[i].setEnabled(false);
}
}
// At this point, we have determined where we can send out
// gsm data or not.
// realize the processor
if (encodingOk) {
processor.realize();
while (processor.getState() != Processor.Realized){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// get the output datasource of the processor and exit
// if we fail
DataSource ds = null;
try {
ds = processor.getDataOutput();
} catch (NotRealizedError e) {
System.exit(-1);
}
// hand this datasource to manager for creating an RTP
// datasink our RTP datasink will multicast the audio
try {
String url= "rtp://224.0.0.1:22224/audio/16";
MediaLocator m = new MediaLocator(url);
DataSink d = Manager.createDataSink(ds, m);
d.open();
d.start();
processor.start();
} catch (Exception e) {
System.exit(-1);
} 
} 
}
}

接收器：

import java.io.IOException;
import java.net.MalformedURLException;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.NoPlayerException;
import javax.media.Player;
public class SimpleVoiceReciver{
/**
* @param args
*/
public static void main(String[] args) {
String url= "rtp://192.168.1.111:22224/audio/16";
MediaLocator mrl= new MediaLocator(url);
if (mrl == null) {
System.err.println("Can't build MRL for RTP");
System.exit(-1);
}
// Create a player for this rtp session
Player player = null;
try {
player = Manager.createPlayer(mrl);
} catch (NoPlayerException e) {
System.err.println("Error:" + e);
System.exit(-1);
} catch (MalformedURLException e) {
System.err.println("Error:" + e);
System.exit(-1);
} catch (IOException e) {
System.err.println("Error:" + e);
System.exit(-1);
}
if (player != null) {
System.out.println("Player created.");
player.realize();
// wait for realizing
while (player.getState() != Player.Realized){
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
player.start();
} else {
System.err.println("Player doesn't created.");
System.exit(-1);
}
}
}

Answer 1

在本地网络上进行这种多播听起来是完全可能的。AFAIK这将不会在互联网上工作。另请参阅：设备对多播的支持显然非常零散。因此，请进行研究，并确保您使用的Android设备在软件和硬件层面上确实支持这一点——其中许多设备并不支持。Cavat Emptor。