android jpg转yuv和android直接读取yuv文件进行查看
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2022-03-29 15:57:56
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package com.jxd.jxdcamerapro.yuv;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ImageFormat;
import android.graphics.Rect;
import android.graphics.YuvImage;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import com.jxd.jxdcamerapro.R;
import com.jxd.jxdcamerapro.utils.FileUtils;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.lang.ref.SoftReference;
import java.nio.ByteBuffer;
import java.util.concurrent.Executors;
public class YuvReaderActivity extends Activity {
private Button yuvReaderBtn,yuvTransBtn;
private static final int TRANS_TO_YUV = 0;
private static final int YUV_READER = 1;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_yuv_reader);
setViews();
}
private void setViews() {
imageView = ((ImageView) findViewById(R.id.yuv_shower_img));
yuvTransBtn = (Button) findViewById(R.id.trans_to_yuv_btn);
yuvTransBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
transOnclick();
}
});
yuvReaderBtn = (Button) findViewById(R.id.yuv_reader_btn);
yuvReaderBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
readerOnclick();
}
});
}
private void readerOnclick() {
toResult(YUV_READER);
}
private void transOnclick() {
toResult(TRANS_TO_YUV);
}
private void toResult(int code){
// **系统图库，选择一张图片
Intent intent = new Intent(Intent.ACTION_PICK);
if(code==TRANS_TO_YUV){
intent.setType("image/*");
}
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
startActivityForResult(intent,code);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.d("YuvReaderActivityp","requestCode "+requestCode);
if(data == null || data.getData()==null){
return;
}
String path = FileUtils.getPathFromUri(YuvReaderActivity.this,data.getData());
switch (requestCode){
case TRANS_TO_YUV:
transYuv(path);
break;
case YUV_READER:
yuvReader(path);
break;
}
}
private void yuvReader(final String path) {
Log.d("YuvReaderActivityp","yuvReader "+path);
Executors.newSingleThreadExecutor().submit(new Runnable() {
@Override
public void run() {
try {
FileInputStream in = new FileInputStream(path);
Log.d("YuvReaderActivityp","readfile "+in.available()/1024);
byte[] buffer = new byte[in.available()];//in.available() 表示要读取的文件中的数据长度
in.read(buffer); //将文件中的数据读到buffer中
//最后记得，关闭流
in.close();
onFrame(buffer);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public void onFrame(byte[] yuvData) {
int prevSizeW = 1440;
int prevSizeH = 810;
Log.d("YuvReaderActivityp","I420ToRGB ");
byte[] nv21data=I420Tonv21(yuvData,prevSizeW,prevSizeH);
YuvImage yuvimage = new YuvImage(
nv21data,
ImageFormat.NV21,
prevSizeW,
prevSizeH,
null);//data是onPreviewFrame参数提供
ByteArrayOutputStream baos = new ByteArrayOutputStream();
yuvimage.compressToJpeg( new Rect(0, 0,yuvimage.getWidth(), yuvimage.getHeight()), 100, baos);// 80--JPG图片的质量[0-100],100最高
byte[] rawImage =baos.toByteArray();
BitmapFactory.Options options = new BitmapFactory.Options();
//options.inPreferredConfig = Bitmap.Config.RGB_565; //默认8888
//options.inSampleSize = 8;
SoftReference<Bitmap> softRef = new SoftReference<Bitmap>(BitmapFactory.decodeByteArray(rawImage, 0,rawImage.length,options));//方便回收
final Bitmap bmpout = (Bitmap) softRef.get();
runOnUiThread(new Runnable() {
@Override
public void run() {
Log.d("YuvReaderActivityp","imageView show ");
imageView.setImageBitmap(bmpout);
}
});
}
private void transYuv(final String path) {
Log.d("YuvReaderActivityp","transYuv "+path);
Executors.newSingleThreadExecutor().submit(new Runnable() {
@Override
public void run() {
try {
BitmapFactory.Options option = new BitmapFactory.Options();
option.inSampleSize = 4;
Bitmap bitmap = BitmapFactory.decodeFile(path,option);
int inputWidth = bitmap.getWidth();
int inputHeight = bitmap.getHeight();
int[] argb = new int[inputWidth * inputHeight];
// Bitmap 获取 argb
bitmap.getPixels(argb, 0, inputWidth, 0, 0, inputWidth, inputHeight);
byte[] yuv = new byte[inputWidth * inputHeight *3/2];
// argb 8888 转 i420
conver_argb_to_i420(yuv, argb, inputWidth, inputHeight);
FileOutputStream fileOutputStream = new FileOutputStream(new File(path).getParent()+"/"+System.currentTimeMillis()+".yuv");
fileOutputStream.write(yuv);
fileOutputStream.close();
Log.d("YuvReaderActivityp","transYuv success");
}catch (Exception e){
e.printStackTrace();
}
}
});
}
/**
* I420转nv21
* @param data
* @param width
* @param height
* @return
*/
public static byte[] I420Tonv21(byte[] data, int width, int height) {
byte[] ret = new byte[data.length];
int total = width * height;
ByteBuffer bufferY = ByteBuffer.wrap(ret, 0, total);
ByteBuffer bufferV = ByteBuffer.wrap(ret, total, total /4);
ByteBuffer bufferU = ByteBuffer.wrap(ret, total + total / 4, total /4);
bufferY.put(data, 0, total);
for (int i=0; i<total/4; i+=1) {
bufferV.put(data[total+i]);
bufferU.put(data[i+total+total/4]);
}
return ret;
}
// argb 8888 转 i420
public static void conver_argb_to_i420(byte[] i420, int[] argb, int width, int height) {
final int frameSize = width * height;
int yIndex = 0; // Y start index
int uIndex = frameSize; // U statt index
int vIndex = frameSize*5/4; // V start index: w*h*5/4
int a, R, G, B, Y, U, V;
int index = 0;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
a = (argb[index] & 0xff000000) >> 24; // is not used obviously
R = (argb[index] & 0xff0000) >> 16;
G = (argb[index] & 0xff00) >> 8;
B = (argb[index] & 0xff) >> 0;
// well known RGB to YUV algorithm
Y = ( ( 66 * R + 129 * G + 25 * B + 128) >> 8) + 16;
U = ( ( -38 * R - 74 * G + 112 * B + 128) >> 8) + 128;
V = ( ( 112 * R - 94 * G - 18 * B + 128) >> 8) + 128;
// I420(YUV420p) -> YYYYYYYY UU VV
i420[yIndex++] = (byte) ((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));
if (j % 2 == 0 && i % 2 == 0) {
i420[uIndex++] = (byte)((U<0) ? 0 : ((U > 255) ? 255 : U));
i420[vIndex++] = (byte)((V<0) ? 0 : ((V > 255) ? 255 : V));
}
index ++;
}
}
}
}
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