android 4.0 USB Camera实例(二)应用层

上一篇说了HAL层这一篇具体应用HAL层实例预览与拍照的功能

首先贴上两个主文件的源码

Fimcgzsd.java

[java] view plain copy

packagecom.dao.usbcam;
publicclassFimcgzsd{
staticpublicnativeintopen(byte[]devname);
staticpublicnativeintqbuf(intindex);
staticpublicnativeintstreamon();
staticpublicnativeintstreamoff();
staticpublicnativeintdqbuf(byte[]videodata);
staticpublicnativeintrelease();
staticpublicnativeintinit(intwidth,intheight,intnumbuf);
static{
System.loadLibrary("fimcgzsd");
}
}

这个主要是HAL层的一些接口函数

MainActivity.java

[java] view plain copy

packagecom.dao.usbcam;
importjava.io.File;
importjava.io.FileNotFoundException;
importjava.io.FileOutputStream;
importjava.io.IOException;
importandroid.app.Activity;
importandroid.graphics.Bitmap;
importandroid.graphics.BitmapFactory;
importandroid.os.Bundle;
importandroid.os.Environment;
importandroid.os.Handler;
importandroid.text.format.Time;
importandroid.view.Menu;
importandroid.view.View;
importandroid.view.Window;
importandroid.view.WindowManager;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.ImageView;
importandroid.widget.Toast;
publicclassMainActivityextendsActivity{
privateImageViewmImag;
privateintwidth=640;
privateintheight=480;
privateStringdevname="/dev/video3";
privatebyte[]mdata;
privateHandlermHandler;
privateintnumbuf=0;
privateintindex=0;
privateintret=0;
publicButtonmcap;
privateBitmapbitmap;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
mImag=(ImageView)findViewById(R.id.mimg);
mcap=(Button)findViewById(R.id.mcap);
numbuf=4;
mdata=newbyte[width*height*numbuf];
ret=Fimcgzsd.open(devname.getBytes());
if(ret<0)
finish();
ret=Fimcgzsd.init(width,height,numbuf);
if(ret<0)
finish();
ret=Fimcgzsd.streamon();
if(ret<0)
finish();
mHandler=newHandler();
newStartThread().start();
mcap.setOnClickListener(newCaptureListener());
}
finalRunnablemUpdateUI=newRunnable(){
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
mImag.setImageBitmap(bitmap);
}
};
classStartThreadextendsThread{
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
//super.run();
while(true){
index=Fimcgzsd.dqbuf(mdata);
if(index<0){
onDestroy();
break;
}
mHandler.post(mUpdateUI);
bitmap=BitmapFactory.decodeByteArray(mdata,0,width*height);
Fimcgzsd.qbuf(index);
}
}
}
publicstaticvoidsaveMyBitmap(BitmapmBitmap){
Timemtime=newTime();
mtime.setToNow();
Filefdir=newFile(Environment.getExternalStorageDirectory().getPath()+"/DCIM/"+"/gzsd/");
if(!fdir.exists()){
fdir.mkdir();
}
Filef=newFile(Environment.getExternalStorageDirectory().getPath()+"/DCIM/"+"/gzsd/"+mtime.year+mtime.month+mtime.monthDay+mtime.hour+mtime.minute+mtime.second+".png");
try{
f.createNewFile();
}catch(IOExceptione){
e.printStackTrace();
}
FileOutputStreamfOut=null;
try{
fOut=newFileOutputStream(f);
mBitmap.compress(Bitmap.CompressFormat.PNG,100,fOut);
fOut.flush();
fOut.close();
}catch(FileNotFoundExceptione){
e.printStackTrace();
}catch(IOExceptione){
e.printStackTrace();
}
}
classCaptureListenerimplementsOnClickListener{
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
//newCapThread().start();
//Fimcgzsd.streamoff();
saveMyBitmap(bitmap);
//Fimcgzsd.streamon();
Toast.makeText(MainActivity.this,"CaptureSuccessfully",Toast.LENGTH_LONG).show();
}
}
classCapThreadextendsThread{
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
//super.run();
saveMyBitmap(bitmap);
Toast.makeText(MainActivity.this,"CaptureSuccessfully",Toast.LENGTH_LONG).show();
}
}
@Override
protectedvoidonStop(){
//TODOAuto-generatedmethodstub
super.onStop();
Fimcgzsd.release();
finish();
}
@Override
protectedvoidonPause(){
//TODOAuto-generatedmethodstub
super.onPause();
Fimcgzsd.release();
finish();
}
@Override
protectedvoidonDestroy(){
//TODOAuto-generatedmethodstub
super.onDestroy();
Fimcgzsd.release();
}
@Override
publicbooleanonCreateOptionsMenu(Menumenu){
//Inflatethemenu;thisaddsitemstotheactionbarifitispresent.
getMenuInflater().inflate(R.menu.main,menu);
finish();
returntrue;
}
}

整体过程其实很简单

首先open

这里usb camera设备为/dev/video3 为了修改方面所以我把这个参数放在应用层里传到HAL层分辨率为640*480

然后init

[java] view plain copy

Fimcgzsd.init(width,height,numbuf);

传入宽，高以及缓冲帧的数目

然后开启视频流

[java] view plain copy

Fimcgzsd.streamon();

开另外一个进程循环获取数据由于这里获取到的数据直接是jpeg格式的所以我直接把他转成bmp然后用imageview直接显示又省了不少事

贴上我的效果图

30W像素的摄像头，目前capture似乎还有问题，似乎是驱动有问题继续研究中...

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作者：hclydao
http://blog.csdn.net/hclydao
版权没有，但是转载请保留此段声明

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