blocks|key|5523901|text|请查看以下开源项目：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5523902|http://www.live555.com/mediaServer/|offset|length|5523903|它支持开箱即用的流式wav音频文件。|5523904|‘’LIVE555媒体服务器‘是一个完整的RTSP服务器应用程序。它可以流式传输几种媒体文件(必须存储在当前工作目录中，即启动应用程序的目录或子目录中)：’|5523905|5523906|A+WAV+(PCM)音频文件(文件名后缀为".wav")|unordered-list-item|5523907|5523908|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|Z|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@$D|X|E|Y|1|Z]]|A|$]]|$1|F|3|G|5|6|7|10|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|13|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|C]]]]

Please check out the following open source project:

<a href="http://www.live555.com/mediaServer/" rel="nofollow noreferrer">http://www.live555.com/mediaServer/</a>

It supports streaming wav audio files out of the box.

'The "LIVE555 Media Server" is a complete RTSP server application. It can stream several kinds of media file (which must be stored in the current working directory - i.e., the directory from which you launch the application - or a subdirectory.):'

<ul>
<li>A WAV (PCM) audio file (with file name suffix ".wav")</li>
</ul>

blocks|key|410742|text|你应该试试：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|410743|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

you should try : <a href="http://wav2rtp.sourceforge.net/" rel="nofollow noreferrer">WAV-2-RTP software</a>

blocks|key|5523857|text|Hippias，你的一些关于理论的有效载荷的答案在https://www.rfc-editor.org/rfc/rfc3952#section-3中描述得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5523858|我在下面添加了Java示例，因为它相当容易阅读，并且足够冗长，让您能够理解。|5523859|尽管你可能不想从头开始写一个wav流程序。有一个旧的Java+RTP库，可以免费获得，尽管现在已经有几年没有积极维护它了：https://github.com/biasedbit/efflux|5523860|对于读取和写入wav文件，这里有一个整洁的教程：http://www.labbookpages.co.uk/audio/javaWavFiles.html+-地球友好。|5523861|此外，哥伦比亚大学有一些来自近20年前的RTP接收器的代码：http://www.cs.columbia.edu/~hgs/teaching/ais/1998/projects/java_rtp/java/net/RTP/RTCPReceiverThread.java另外，如果你在这些文件夹中挖掘，他们有一堆相关的实用程序，比如监控。|5523862|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rfc-editor.org/rfc/rfc3952#section-3|1|https://github.com/biasedbit/efflux|2|http://www.labbookpages.co.uk/audio/javaWavFiles.html|3|http://www.cs.columbia.edu/%257Ehgs/teaching/ais/1998/projects/java_rtp/java/net/RTP/RTCPReceiverThread.java^0|P|1C|0|0|0|1P|Z|1|0|O|1H|2|0|U|2W|3|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@$A|10|B|11|1|12]]|C|$]]|$1|D|3|E|5|6|7|13|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|H|3|I|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|J|3|K|5|6|7|1C|8|@]|9|@$A|1D|B|1E|1|1F]]|C|$]]|$1|L|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|M|$N|$5|O|P|Q|C|$R|S]]|T|$5|O|P|Q|C|$R|U]]|V|$5|O|P|Q|C|$R|W]]|X|$5|O|P|Q|C|$R|Y]]]]

Hippias, some of your payload related answers about the theory are described pretty well in <a href="https://www.rfc-editor.org/rfc/rfc3952#section-3" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc3952#section-3</a>
I added Java examples below because it is fairly easy to read and verbose enough for you to follow.
Though you'd probably not want to write a wav streamer from scratch.
There is an old Java RTP library, freely available, though it's not been actively maintained for several years now: <a href="https://github.com/biasedbit/efflux" rel="nofollow noreferrer">https://github.com/biasedbit/efflux</a>
For reading and writing wav files, here is a neat tutorial: <a href="http://www.labbookpages.co.uk/audio/javaWavFiles.html" rel="nofollow noreferrer">http://www.labbookpages.co.uk/audio/javaWavFiles.html</a> - earthling friendly.
Also, Columbia has some code for an RTP receiver from almost 20 years ago: <a href="http://www.cs.columbia.edu/%7Ehgs/teaching/ais/1998/projects/java_rtp/java/net/RTP/RTCPReceiverThread.java" rel="nofollow noreferrer">http://www.cs.columbia.edu/~hgs/teaching/ais/1998/projects/java_rtp/java/net/RTP/RTCPReceiverThread.java</a> Additionally, they have a bunch of related utilities like monitoring if you dig around in those folders.

blocks|key|5523925|text|public+class+UdpDataReceiver+implements+Runnable+{

++++private+boolean+isRunning+=+true;
++++private+int+port+=+-1;
++++private+DatagramSocket+socket;

++++public+UdpDataReceiver(int+port)+{
++++++++this.port+=+port;
++++}

++++public+void+stop()+{
++++++++isRunning+=+false;
++++++++socket.close();
++++}

++++@Override
++++public+void+run()+{
++++++++try+{
++++++++++++socket+=+new+DatagramSocket(port);
++++++++++++System.out.println("+%2B+Listening+for+UDP+data+on+port+"+%2B+port+%2B+".");
++++++++}+catch+(Exception+e)+{
++++++++++++e.printStackTrace();
++++++++}

++++++++//+Size+of+data+buffer+is+insignificant;+it+just+needs+to+be+big+enough+to+hold+the+UDP+packet+(or+it+will+be+truncated).
++++++++byte[]+data+=+new+byte[512];
++++++++DatagramPacket+packet+=+new+DatagramPacket(data,+data.length);

++++++++String+file+=+null;
++++++++FileOutputStream+fos+=+null;
++++++++try+{
++++++++++++//+For+now+we'll+just+dump+to+a+file.
++++++++++++file+=+"C:\\tmp\\"+%2B+System.currentTimeMillis()+%2B+".raw";
++++++++++++fos+=+new+FileOutputStream(file);

++++++++++++while+(isRunning)+{
++++++++++++++++try+{
++++++++++++++++++++socket.receive(packet);
++++++++++++++++}+catch+(SocketException+se)+{
++++++++++++++++++++//+If+we're+just+trying+to+tell+the+socket+we're+done,+we'll+get+a+SocketException.
++++++++++++++++++++if+(isRunning)+{
++++++++++++++++++++++++se.printStackTrace();
++++++++++++++++++++}
++++++++++++++++}
++++++++++++++++if+(packet.getLength()+>+12)+{
++++++++++++++++++++//+Strip+off+12+bytes+of+header+data.
++++++++++++++++++++fos.write(packet.getData(),+packet.getOffset()+%2B+12,+packet.getLength()+-+12);
++++++++++++++++}
++++++++++++}
++++++++}+catch+(Exception+e)+{
++++++++++++e.printStackTrace();
++++++++}+finally+{
++++++++++++try+{
++++++++++++++++fos.flush();
++++++++++++++++fos.close();
++++++++++++++++convertULawFileToWav(file);
++++++++++++}+catch+(Exception+e)+{
++++++++++++}
++++++++++++System.out.println("+%2B+Closed+port+"+%2B+port+%2B+"+and+wrote+UDP+packets+to+file:+"+%2B+file);
++++++++}
++++}

++++public+static+void+convertULawFileToWav(String+filename)+{
++++++++File+file+=+new+File(filename);
++++++++if+(!file.exists())
++++++++++++return;
++++++++try+{
++++++++++++long+fileSize+=+file.length();
++++++++++++int+frameSize+=+160;
++++++++++++long+numFrames+=+fileSize+/+frameSize;
++++++++++++AudioFormat+audioFormat+=+new+AudioFormat(Encoding.ULAW,+8000,+8,+1,+frameSize,+50,+true);
++++++++++++AudioInputStream+audioInputStream+=+new+AudioInputStream(new+FileInputStream(file),+audioFormat,+numFrames);
++++++++++++AudioSystem.write(audioInputStream,+Type.WAVE,+new+File(file.getAbsolutePath().substring(0,+file.getAbsolutePath().length()+-+3)+%2B+"wav"));
++++++++}+catch+(IOException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}

++++//+For+testing...
++++public+static+void+main(String[]+args)+throws+InterruptedException+{
++++++++UdpDataReceiver+r1+=+new+UdpDataReceiver(65337);
++++++++new+Thread(r1).start();
++++++++//+Send+data...
++++++++Thread.sleep(30000);
++++++++r1.stop();
++++}

}
shareeditflag|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5523926|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public class UdpDataReceiver implements Runnable {

 private boolean isRunning = true;
 private int port = -1;
 private DatagramSocket socket;

 public UdpDataReceiver(int port) {
 this.port = port;
 }

 public void stop() {
 isRunning = false;
 socket.close();
 }

 @Override
 public void run() {
 try {
 socket = new DatagramSocket(port);
 System.out.println(" + Listening for UDP data on port " + port + ".");
 } catch (Exception e) {
 e.printStackTrace();
 }

 // Size of data buffer is insignificant; it just needs to be big enough to hold the UDP packet (or it will be truncated).
 byte[] data = new byte[512];
 DatagramPacket packet = new DatagramPacket(data, data.length);

 String file = null;
 FileOutputStream fos = null;
 try {
 // For now we'll just dump to a file.
 file = "C:\\tmp\\" + System.currentTimeMillis() + ".raw";
 fos = new FileOutputStream(file);

 while (isRunning) {
 try {
 socket.receive(packet);
 } catch (SocketException se) {
 // If we're just trying to tell the socket we're done, we'll get a SocketException.
 if (isRunning) {
 se.printStackTrace();
 }
 }
 if (packet.getLength() &gt; 12) {
 // Strip off 12 bytes of header data.
 fos.write(packet.getData(), packet.getOffset() + 12, packet.getLength() - 12);
 }
 }
 } catch (Exception e) {
 e.printStackTrace();
 } finally {
 try {
 fos.flush();
 fos.close();
 convertULawFileToWav(file);
 } catch (Exception e) {
 }
 System.out.println(" + Closed port " + port + " and wrote UDP packets to file: " + file);
 }
 }

 public static void convertULawFileToWav(String filename) {
 File file = new File(filename);
 if (!file.exists())
 return;
 try {
 long fileSize = file.length();
 int frameSize = 160;
 long numFrames = fileSize / frameSize;
 AudioFormat audioFormat = new AudioFormat(Encoding.ULAW, 8000, 8, 1, frameSize, 50, true);
 AudioInputStream audioInputStream = new AudioInputStream(new FileInputStream(file), audioFormat, numFrames);
 AudioSystem.write(audioInputStream, Type.WAVE, new File(file.getAbsolutePath().substring(0, file.getAbsolutePath().length() - 3) + "wav"));
 } catch (IOException e) {
 e.printStackTrace();
 }
 }

 // For testing...
 public static void main(String[] args) throws InterruptedException {
 UdpDataReceiver r1 = new UdpDataReceiver(65337);
 new Thread(r1).start();
 // Send data...
 Thread.sleep(30000);
 r1.stop();
 }

}
shareeditflag
</code></pre>

Suppose that I have an wav audio stay on my disk call it MyDummy.wav.
I want to send it to a server as an RTP Packet. But As I see there are some timing issues with RTP Packet sending some says 20 ms etc...And how I will determine size of RTP Packet... I really can not figure out how to do many things , and are all things necessary?

Anyone can tell as a Pseudocode how to packetize an audio file as RTP packets 
and at which timing I should send the audio or provide any sample code which I can investigate?

Sending Wav Audio File As RTP Packets

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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假设我有一个wav音频保存在我的磁盘上，叫做MyDummy.wav。我想将其作为RTP数据包发送到服务器。但正如我所看到的，发送RTP包有一些计时问题，比如20ms etc...And，我将如何确定RTP包的大小……我真的搞不懂怎么做很多事情，难道所有的事情都是必要的吗？任何人都可以像伪代码一样告诉我如何将音频文件打包为RTP数据包，以及我应该在什么时候发送音频或提供任何可以调查的示例代码？

问以RTP数据包的形式发送Wav音频文件
EN

回答 4

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