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使用索爱v800开发流媒体应用程序
索尼爱立信的v800手机可以支持流媒体的播放，使用非常简单。如果你曾经使用mmapi播放过声音或者做过照相应用的话，那么上手非常快。
你要做的就是根据指定的url来创建一个player，然后启动这个player。url的格式如下：rtsp://myserver/myvideo.3gp。下面的代码例子演示了如何使用：
private void startstreaming(){
try{
myplayer = manager.createplayer("rtsp://myserver/myfile.3gp");
myplayer.addplayerlistener(this);
myplayer.realize();
// grab the video control and set it to the current display.
vc = (videocontrol)myplayer.getcontrol("videocontrol");
if (vc != null) {
myform.append((item)vc.initdisplaymode(vc.use_gui_primitive, null));
// sets the display size of the video.
vc.setdisplaysize(120,160);
}
myplayer.start();
}catch(exception e){
log("exception: " + e.tostring());
}
}
我们需要注意的是进行连接服务器的时候必须在单独线程中处理，而不能在主线程。因为这样会堵塞系统。接下来你要做的就是构建一个支持rtsp的流媒体服务器，放置一个3gp格式的文件在服务器上。下面的代码演示了如何使用v800开发流媒体应用。
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import java.io.*;
import javax.microedition.lcdui.game.*;
/**
* a simple example of the mmapi (jsr 135) support for streaming video
* with the sony ericsson v800.
*
* this code is part of the tips & tricks section at
* www.sonyericsson.com/developer
*
* copyright all rights reserved sony ericsson mobile communications ab 2005.
* the software is the copyrighted work of sony ericsson mobile communications ab.
* the use of the software is subject to the terms of the end-user license
* agreement which accompanies or is included with the software. the software is
* provided "as is" and sony ericsson specifically disclaim any warranty or
* condition whatsoever regarding merchantability or fitness for a specific
* purpose, title or non-infringement. no warranty of any kind is made in
* relation to the condition, suitability, availability, accuracy, reliability,
* merchantability and/or non-infringement of the software provided herein.
*
* written by jöns weimarck, january 2005
*/
public class streamingvideo extends midlet implements commandlistener, playerlistener, runnable{
private display mydisplay;
private form myform;
private thread streamingthread;
private player myplayer;
private videocontrol vc;
private boolean running=false;
public streamingvideo() {
mydisplay = display.getdisplay(this);
myform=new form ("streaming test");
myform.addcommand(new command("exit", command.exit,0));
myform.addcommand(new command("start", command.ok,0));
myform.setcommandlistener(this);
}
protected void startapp() throws midletstatechangeexception {
mydisplay.setcurrent(myform);
streamingthread = new thread(this);
}
protected void pauseapp() {}
protected void destroyapp(boolean unconditional) {
try {
myplayer.stop();
myplayer.close();
}
catch( exception e ) {
log("exception: " + e.tostring());
}
}
/**
* inits and starts the player for video streaming
*/
private void startstreaming(){
try{
myplayer = manager.createplayer("rtsp://myserver/myfile.3gp");
myplayer.addplayerlistener(this);
myplayer.realize();
// grab the video control and set it to the current display.
vc = (videocontrol)myplayer.getcontrol("videocontrol");
if (vc != null) {
myform.append((item)vc.initdisplaymode(vc.use_gui_primitive, null));
// sets the display size of the video.
vc.setdisplaysize(120,160);
}
myplayer.start();
}catch(exception e){
log("exception: " + e.tostring());
}
}
public void commandaction(command c, displayable s){
if(c.getcommandtype()==command.exit){
running=false;
notifydestroyed();
}else{
streamingthread.start();
}
}
/**
* playerlistener interface method, logs all player event.
*/
public void playerupdate(player player, string event, object eventdata){
log(" ** playerupdate: " + event + " **");
}
public void log(string msg){
system.out.println(msg);
}
public void run() {
running=true;
startstreaming();
while(running){
thread.yield();
}
}
}
