📄 videocanvas.java
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package controlVideo;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;
import java.io.*;
public class VideoCanvas extends Canvas implements Runnable,CommandListener,PlayerListener {
private static Player player=null;
private static boolean isCapturePlayer;
private int idx=0;
private boolean fsmode=false;
private Display parentDisplay;
private long duration;
private long lastTime=-1;
private Thread sliderThread;
private Command backCommand=new Command("Back",Command.EXIT,1);
private Command pauseCommand=new Command("Pause",Command.ITEM,10);
private Command playCommand=new Command("Play",Command.ITEM,10);
private Command snapCommand=new Command("Snapshot",Command.ITEM,10);
private VolumeControl vc;
private RateControl rc;
private VideoControl vidc;
private FramePositioningControl fpc;
private int CB_Y=0;
private static final int CB_H=8;
private static final int TH_W=6;
private static final int VB_W=10;
private static final int VB_H=8;
private boolean vis =true ;
private int canvasW;
private int canvasH;
private int videoW;
private int videoH;
private boolean suspended =false ;
private boolean restartOnResume=false;
private long restartMediaTime;
//在框架中添加VideoCanvas类的构造函数
public VideoCanvas(Display parentDisplay){
this.idx=0;
this.parentDisplay=parentDisplay;
canvasW=getWidth();
canvasH=getHeight();
CB_Y=canvasH-CB_H-VB_H-20;
videoW=canvasW-VB_W*2;
videoH=CB_Y-VB_H*2;
initialize();
}
private void initialize(){
addCommand (backCommand);
addCommand(snapCommand);
addCommand(pauseCommand);
setCommandListener(this);
}
//计算时间
public void paint(Graphics g){
if (fsmode )
return ;
g.setColor(0x9090E0);
g.fillRect(0,0,canvasW,canvasH);
g.setColor(0x202050);
g.drawLine(VB_W-1,VB_H-1,videoW+VB_W-1,VB_H-1);
g.drawLine(VB_W-1,VB_H-1,VB_W-1,videoH+VB_H-1);
if(sliderThread!=null){
g.drawLine(VB_W-1,CB_Y,videoW+VB_W-1,CB_Y);
g.drawLine(VB_W-1,CB_Y,VB_W-1,CB_Y+CB_H);
}
g.setColor(0xD0D0FF);
g.drawLine(videoW+VB_W, VB_H,videoW+VB_W,videoH+VB_H);
g.drawLine(videoW+VB_W,videoH+VB_H,VB_W,videoH+VB_H);
if (sliderThread!=null){
g.drawLine(videoW+VB_W,CB_Y+1,videoW+VB_W,CB_Y+CB_H+1);
g.drawLine(videoW+VB_W,CB_Y+CB_H+1,VB_H,CB_Y+CB_H+1);
}
if(sliderThread!=null){
int p=time2pix(lastTime);
g.drawLine(VB_W+p,CB_Y+1,VB_W+p,CB_Y+CB_H);
g.drawLine(VB_W+p,CB_Y+1,VB_W+p+TH_W-1,CB_Y+1);
g.setColor(0x202050);
g.drawLine(VB_W+p+1,CB_Y+CB_H,VB_W+p+TH_W,CB_Y+CB_H);
g.drawLine(VB_W+p+TH_W,CB_Y+CB_H,VB_W+p+TH_W,CB_Y+1);
g.setColor(0xA0A0FF);
g.fillRect(VB_W+p+1,CB_Y+2,TH_W-2,CB_H-2);
g.setColor(0);
g.drawString("00:00",VB_W,CB_Y+CB_H+4,Graphics.TOP|Graphics.LEFT);
g.drawString(time2String(lastTime)+"/"+time2String(duration),VB_W+videoW,CB_Y+CB_H+4,Graphics.TOP|Graphics.RIGHT);
}
}
private int time2pix(long time){
int t2p=(int )((time*(videoW-1-TH_W))/duration);
return t2p;
}
private String time2String(long time){
time=time/1000000;
String strTime=""+(time%10);
time=time/10;
strTime=(time%6)+strTime;
time=time/6;
strTime=(time%10)+":"+strTime;
time=time/10;
strTime=(time%6)+strTime;
time=time/6;
return strTime;
}
//负责创建播放视频的Play对象
public void open(String url){
try{
synchronized (this){
if (player==null){
if (url.startsWith("resource:")){
InputStream ins=getClass().getResourceAsStream(url.substring(9));
VideoType vy=new VideoType();
String ct=vy.guessContentType(url);
vy=null;
player=Manager.createPlayer(ins,ct);
}else{
player=Manager.createPlayer(url);
}
player.addPlayerListener(this);
isCapturePlayer = url.startsWith("capture");
}
}
player.realize();
if((vidc=(VideoControl)player.getControl("VideoControl"))!=null){
vidc.initDisplayMode(VideoControl.USE_DIRECT_VIDEO,this);
int frameW=vidc.getSourceWidth();
int frameH=vidc.getSourceHeight();
if (frameW>videoW)
frameW=videoW;
if (frameH>videoH)
frameH=videoH;
int frameX=(videoW-frameW)/2+VB_W;
int frameY=(videoH-frameH)/2+VB_H;
vidc.setDisplayLocation(frameX,frameY);
vidc.setDisplaySize(frameW,frameH);
vidc.setVisible(true);
}
Control[]controls=player.getControls();
for(int i=0;i<controls.length;i++){
if(controls[i] instanceof VolumeControl)
vc=(VolumeControl) controls[i];
if(controls[i] instanceof RateControl)
rc=(RateControl) controls[i];
if(controls[i] instanceof FramePositioningControl)
fpc=(FramePositioningControl) controls[i];
}
player.prefetch();
if(vidc==null)
addCommand(pauseCommand);
}catch(Exception e)
{
System.err.println(e);
close();
}
}
//用于播放的start()函数
public void start(){
if (player==null)
return;
try{
duration=player.getDuration();
player.start();
if(duration!=Player.TIME_UNKNOWN) {
sliderThread=new Thread(this);
sliderThread.start();
}
}catch(Exception e){
System.err.println (e);
close();
}
}
public void run(){
while (player!=null){
try{
long time=player.getMediaTime();
if (time2pix(time)!=time2pix(lastTime)){
lastTime=time;
repaint(VB_W-2,CB_Y,videoW+2,CB_H+2+20);
}
do{
Thread.sleep(250);
}while (player!=null&&suspended);
}catch (Exception e){
System.err.println("In run():"+e);
break;
}
}
}
//暂停播放的pause()函数
public void pause(){
if(player!=null){
try{
player.stop();
}catch (MediaException me){
System.err.println(me);
}
}
}
//停止播放的close()函数
public void close(){
synchronized (this){
pause();
if(player!=null){
player.close();
player=null;
}
}
}
public synchronized void stopVideoCanvas(){
player.deallocate();
}
//
public void playerUpdate(Player plyr,String evt,Object evtData){
if (evt==END_OF_MEDIA){
try{
player.setMediaTime(0);
player.start();
}catch (MediaException me){
System.err.println(me);
}
}
}
public synchronized void pauseApp(){
suspended=true;
if(player!=null&&player.getState()>=Player.STARTED){
if(!isCapturePlayer){
restartMediaTime=player.getMediaTime();
}
player.deallocate();
restartOnResume=true;
}else{
restartOnResume=false;
}
}
public synchronized void startApp(){
suspended=false;
if (player!=null&&restartOnResume){
try{
player.prefetch();
if(!isCapturePlayer){
try{
player.setMediaTime(restartMediaTime);
}catch (MediaException me){
System.err.println(me);
}
}
player.start();
}catch (MediaException me){
System.err.println(me);
}
}
restartOnResume=false;
}
//提供抓图的功能
private void doSnapshot(){
final Canvas tThis =this ;
new Thread (){
public void run (){
try {
byte[] snap=vidc .getSnapshot("encoding=jpeg");
if(snap!=null){
Image im=Image.createImage(snap,0,snap.length);
Alert al=new Alert("Snapshot","here's the snap",im,AlertType.INFO);
al.setTimeout(2000);
parentDisplay.setCurrent(al,tThis);
}
}catch (MediaException me){
System.err.println(me);
}
}
}.start();
}
//通过手机键盘和按键来控制
public void keyPressed(int keyCode){
int cr,cv;
switch(keyCode){
case Canvas.KEY_NUM4 :
cr=rc.getRate();
cr-=10000;
cr=rc.setRate(cr);
break;
case Canvas.KEY_NUM6:
cr=rc.getRate();
cr+=10000;
cr=rc.setRate(cr);
break;
case Canvas.KEY_STAR:
if(vc!=null){
cv=vc.getLevel();
cv-=10;
cv=vc.setLevel(cv);
}
break;
case Canvas.KEY_NUM0:
if(vc!=null){
vc.setMute(!vc.isMuted());
}
break;
case Canvas.KEY_POUND:
if(vc!=null){
cv=vc.getLevel();
cv+=10;
cv=vc.setLevel(cv);
}
break;
case Canvas.KEY_NUM7:
if(fpc!=null){
fpc.skip(-3);
}
break;
case Canvas.KEY_NUM5:
try{
player.stop();
if(!isCapturePlayer){
player.setMediaTime(0);
}
player.deallocate();
}catch (MediaException me){
System.err.println(me);
}
break;
case Canvas.KEY_NUM9:
if(fpc!=null){
fpc.skip(3);
}
break;
case Canvas.KEY_NUM2:
try{
if(player.getState()==Player.STARTED){
player.stop();
removeCommand(pauseCommand);
addCommand(playCommand);
}
else{
player.start();
removeCommand(playCommand);
addCommand(pauseCommand);
}
}catch(Exception e){
System.err.println(e);
}
break;
case Canvas.KEY_NUM8:
try{
if(vidc!=null)
vidc.setDisplayFullScreen(fsmode=!fsmode);
repaint();
}catch (MediaException me){
System.err.println(me);
}
break;
//case Canvas.KEY_NUM1:
case Canvas.KEY_NUM3:
if (!isCapturePlayer){
long mTime=player.getMediaTime();
long duration=player.getDuration();
if(duration==player.TIME_UNKNOWN||mTime==player.TIME_UNKNOWN)
return ;
try{
if(keyCode==Canvas.KEY_NUM1)
{
mTime -=duration/10;
if(mTime<0)
mTime=0;
player.setMediaTime(mTime);
}
else if(keyCode==Canvas.KEY_NUM3)
{
mTime =mTime+(duration /10);
if(mTime>duration)
mTime=duration;
player.setMediaTime(mTime);
}
else
return;
}catch (MediaException me){
System.err.println(me);
}
}
break;
default:
int game =getGameAction(keyCode);
int x=vidc.getDisplayX();
int y=vidc.getDisplayY();
if(game==UP)
vidc.setDisplayLocation(x,y-10);
else if (game==DOWN)
vidc.setDisplayLocation(x,y+10);
else if (game==LEFT)
vidc.setDisplayLocation(x-10,y);
else if(game==RIGHT)
vidc.setDisplayLocation(x+10,y);
else if (game==FIRE)
vidc.setVisible(vis=!vis);
repaint();
break;
}
}
//支持触摸屏的功能
protected void pointerPressed(int x,int y){
if (duration==Player.TIME_UNKNOWN||isCapturePlayer)
return;
if(y>=CB_Y&&y<CB_Y+CB_H){
if(x>=VB_W-2&&x<=VB_W-2+videoW){
x=x-(VB_W+1);
if(x<0)
x=0;
if(x>videoW-TH_W)
x=videoW-TH_W;
long time =(duration*x)/(videoW-TH_W);
try{
player.setMediaTime(time);
}catch (MediaException me){
System.out.println(me);
}
}
}
}
protected void pointerDragged(int x,int y){
pointerPressed(x,y);
}
public void commandAction(Command c,Displayable s){
if(s==this){
if(c==backCommand){
close();
}else if (vidc!=null&&c==snapCommand){
doSnapshot();
}else if(vidc!=null&&c==pauseCommand){
removeCommand(pauseCommand);
addCommand(playCommand);
pause();
}else if (c==playCommand){
start();
removeCommand(playCommand);
addCommand(pauseCommand);
}
}
}
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