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
package com.dao.usbcam;
public class Fimcgzsd {
static public native int open(byte[] devname);
static public native int qbuf(int index);
static public native int streamon();
static public native int streamoff();
static public native int dqbuf(byte[] videodata);
static public native int release();
static public native int init(int width, int height,int numbuf);
static {
System.loadLibrary("fimcgzsd");
}
}
这个主要是HAL层的一些接口函数
MainActivity.java
package com.dao.usbcam;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.text.format.Time;
import android.view.Menu;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity extends Activity {
private ImageView mImag;
private int width = 640;
private int height = 480;
private String devname = "/dev/video3";
private byte[] mdata;
private Handler mHandler;
private int numbuf = 0;
private int index = 0;
private int ret = 0;
public Button mcap;
private Bitmap bitmap;
@Override
protected void onCreate(Bundle savedInstanceState) {
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 = new byte[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 = new Handler();
new StartThread().start();
mcap.setOnClickListener(new CaptureListener());
}
final Runnable mUpdateUI = new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
mImag.setImageBitmap(bitmap);
}
};
class StartThread extends Thread {
@Override
public void run() {
// TODO Auto-generated method stub
//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);
}
}
}
public static void saveMyBitmap(Bitmap mBitmap) {
Time mtime = new Time();
mtime.setToNow();
File fdir = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + "/gzsd/");
if(!fdir.exists()) {
fdir.mkdir();
}
File f = new File(Environment.getExternalStorageDirectory().getPath() + "/DCIM/" + "/gzsd/" + mtime.year + mtime.month + mtime.monthDay + mtime.hour + mtime.minute +mtime.second+".png");
try {
f.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
FileOutputStream fOut = null;
try {
fOut = new FileOutputStream(f);
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
fOut.flush();
fOut.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
class CaptureListener implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//new CapThread().start();
//Fimcgzsd.streamoff();
saveMyBitmap(bitmap);
//Fimcgzsd.streamon();
Toast.makeText(MainActivity.this, "Capture Successfully", Toast.LENGTH_LONG).show();
}
}
class CapThread extends Thread {
@Override
public void run() {
// TODO Auto-generated method stub
//super.run();
saveMyBitmap(bitmap);
Toast.makeText(MainActivity.this, "Capture Successfully", Toast.LENGTH_LONG).show();
}
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Fimcgzsd.release();
finish();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Fimcgzsd.release();
finish();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Fimcgzsd.release();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
finish();
return true;
}
}
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
Fimcgzsd.init(width, height, numbuf);传入宽，高 以及 缓冲帧的数目
然后开启视频流
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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