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ScreenCapture.java
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package com.fei435;
import static com.googlecode.javacv.cpp.opencv_highgui.cvLoadImage;
import com.fei435.FileUtils;
import com.fei435.FileUtils.NoSdcardException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
//文件锁
import java.nio.channels.FileLock;
import java.nio.channels.FileChannel;
import java.io.RandomAccessFile;
import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import com.googlecode.javacv.FFmpegFrameRecorder;
import com.googlecode.javacv.FrameRecorder.Exception;
import com.googlecode.javacv.cpp.opencv_core;
/**
* convertFromBitmaptoVideo
* @author yanjiaqi qq:985202568
* modified by feifei435
*/
public class ScreenCapture {
private static int switcher = 0;//录像键
private static boolean isPaused = false;//暂停键
private static double RECORD_FPS = 10f;
private static String video_path_name = null;
//截取视频一帧并保存 注意 bitName为路径+文件名
public static int saveBitmapToFile(Bitmap mBitmap, String bitName){
FileOutputStream fOut = null;
Log.i("ScreenCapture", "saveBitmapToFile enter");
if (null == bitName || bitName.length() <= 4) {
return Constant.CAM_RES_FAIL_FILE_NAME_ERROR;
}
File f = new File(bitName);
Log.i("ScreenCapture", "saveBitmapToFile, fname =" + f);
try {
f.createNewFile();
Log.i("ScreenCapture", "saveBitmapToFile, createNewFile success, f=" + f);
fOut = new FileOutputStream(f);
Log.i("ScreenCapture", "saveBitmapToFile, FileOutputStream success, fOut=" + fOut);
} catch (IOException e) {
Log.i("ScreenCapture", "exception, err=" + e.getMessage());
return Constant.CAM_RES_FAIL_FILE_WRITE_ERROR;
}
mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
try {
fOut.flush();
fOut.close();
} catch (IOException e) {
e.printStackTrace();
return Constant.CAM_RES_FAIL_BITMAP_ERROR;
}
return Constant.CAM_RES_OK;
}
public static void start(){
video_path_name = FileUtils.generateFileName("VID_");
switcher = 1;
new Thread(){
public void run(){
Log.i("ScreenCapture", "ScreenCapture线程已启动");
try {
new FileUtils().creatSDDir(FileUtils.FILE_PATH);
//TODO:可选的方案：把这里的640 480改为先读取assets中的示例图片的宽高，也可以确定录像参数
FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(
video_path_name, 640, 480);
Log.i("ScreenCapture", "recorder已创建，"+"width:"+recorder.getImageHeight()+"height:"+recorder.getImageHeight());
recorder.setFormat("mp4");
recorder.setFrameRate(RECORD_FPS);//录像帧率
recorder.start();
while(switcher!=0){
if(!isPaused){
//TODO:判断是否跟上一帧重复 保证帧率
//虽然这里由cvLoadImage直接根据路径读取图像，但是为了使用java中文件锁保持互斥，还是要定义一个File对象
if(!FileUtils.frameFileLocked) {
if(new FileUtils().isFileExist(FileUtils.TMP_FRAME_NAME, FileUtils.FILE_PATH)){
FileUtils.frameFileLocked = true;//加锁
Log.i("filelock", "recorder:已将"+FileUtils.TMP_FRAME_NAME+"加锁");
FileUtils.frameFileLocked = true;//加锁
Log.i("filelock", "recorder:已将"+FileUtils.TMP_FRAME_NAME+"加锁");
opencv_core.IplImage image = cvLoadImage(new FileUtils().getSDCardRoot()+ FileUtils.FILE_PATH + File.separator+FileUtils.TMP_FRAME_NAME);
Log.i("ScreenCapture", "recorder正在将帧"+System.currentTimeMillis()+"保存到MP4文件");
recorder.record(image);
//解锁文件
FileUtils.frameFileLocked = false;
Log.i("filelock", "recorder:已将"+FileUtils.TMP_FRAME_NAME+"解锁");
try {//录完一帧休息一下
sleep(200);
Log.i("filelock", "recorder:sleep some time");
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
Log.i("ScreenCapture", "等待tmpframe.jpg");
try {
sleep(200);
Log.i("filelock", "recorder:sleep some time");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
} else {
//MjpegView线程正在写jpg，放弃读
Log.i("ScreenCapture", "MjpegView线程正在写"+FileUtils.TMP_FRAME_NAME+",放弃保存图像");
try {
sleep(200);
Log.i("filelock", "recorder:sleep some time");
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
recorder.stop();
Log.i("ScreenCapture", "recorder已停止");
}catch(FileUtils.NoSdcardException e){
e.printStackTrace();
}
catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
//返回值为视频路径
public static String stop(){
switcher = 0;
isPaused = false;
return video_path_name;
}
public static void pause(){
if(switcher==1){
isPaused = true;
}
}
public static void restart(){
if(switcher==1){
isPaused = false;
}
}
public static boolean isStarted(){
if(switcher==1){
return true;
}else{
return false;
}
}
public static boolean isPaused(){
return isPaused;
}
private static Bitmap getImageFromFile(String filename){
Bitmap image = null;
try{
image = BitmapFactory.decodeFile(
new FileUtils().getSDCardRoot() +
FileUtils.FILE_PATH + File.separator + filename
);
}catch (NoSdcardException e) {
e.printStackTrace();
}
return image;
}
}