Android NDK開發 native層獲取Surface並顯示影象 思路過程
阿新 • • 發佈：2019-01-29
import java.io.File;
import java.io.FileInputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Surface;
import android.view.SurfaceHolder;
import
import android.view.SurfaceView;
public class MainActivity extends Activity {
private static final String ACTIVITY_TAG = "displayYUV";
final String FILE_NAME = "/akiyo_qcif.yuv";
final int width = 176;
final int height = 144;
final int size = (int
byte[] yuvBuffer = new byte[size];
// final Builder builder = new AlertDialog.Builder(this);
private SurfaceHolder holder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//
// tv.setText( stringFromJNI() );
// setContentView(tv);
// My Code
Log.v(ACTIVITY_TAG, stringFromJNI());
SurfaceView surface = (SurfaceView) findViewById(R.id.show);
// 初始化SurfaceHolder物件 holder = surface.getHolder();
holder.addCallback(new Callback() {
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,
int arg3) {
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
setVideoSurface(holder.getSurface());
//test(holder.getSurface()); if (read(yuvBuffer)) {
// 設定對話方塊的圖示
// builder.setIcon(R.drawable.tools);
// 設定對話方塊的標題
// builder.setTitle("自定義普通對話方塊");
//// 設定對話方塊顯示的內容
// builder.setMessage("一個簡單的提示對話方塊");
////建立、並顯示對話方塊
// builder.create().show();
// }
// 鎖定整個SurfaceView
// Canvas canvas = holder.lockCanvas();
// canvas.drawColor(Color.WHITE);
//// 繪製背景
//// Bitmap back = BitmapFactory.decodeResource(
//// SurfaceViewTest.this.getResources(), R.drawable.sun);
//// 繪製背景
//// canvas.drawBitmap(back, 0, 0, null);
//// 繪製完成，釋放畫布，提交修改
// holder.unlockCanvasAndPost(canvas);
// yourFunction(yuvBuffer, width, height);
////重新鎖一次，"持久化"上次所繪製的內容
// holder.lockCanvas(new Rect(0, 0, 0, 0));
// holder.unlockCanvasAndPost(canvas); int[] mIntArray = new int[width * height];
// Decode Yuv data to integer array
// decodeYUV420SP(mIntArray, data, mWidth, mHeight); convertYUV420_NV21toRGB8888(mIntArray, yuvBuffer, width, height);
drawYUV(mIntArray);
test(holder.getSurface());
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
});
}
private boolean read(byte[] yuvArray) {
try {
// 如果手機插入了SD卡，而且應用程式具有訪問SD的許可權 if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
// 獲取SD卡對應的儲存目錄 File sdCardDir = Environment.getExternalStorageDirectory();
// 獲取指定檔案對應的輸入流 FileInputStream fis = new FileInputStream(
sdCardDir.getCanonicalPath() + FILE_NAME);
fis.read(yuvArray, 0, size);
return true;
} else {
return false;
}
}
catch (Exception e) {
e.printStackTrace();
return false;
}
}
void yourFunction(byte[] data, int mWidth, int mHeight) {
int[] mIntArray = new int[mWidth * mHeight];
// Decode Yuv data to integer array
// decodeYUV420SP(mIntArray, data, mWidth, mHeight); convertYUV420_NV21toRGB8888(mIntArray, data, mWidth, mHeight);
// Initialize the bitmap, with the replaced color Bitmap bmp = Bitmap.createBitmap(mIntArray, mWidth, mHeight,
Bitmap.Config.ARGB_8888);
Canvas canvas = holder.lockCanvas();
canvas.drawBitmap(bmp, 0, 0, null);
holder.unlockCanvasAndPost(canvas);
// Draw the bitmap with the replaced color
// iv.setImageBitmap(bmp);
// ByteArrayOutputStream out = new ByteArrayOutputStream();
// YuvImage yuvImage = new YuvImage(data, ImageFormat.NV21, width,
// height, null);
// yuvImage.compressToJpeg(new Rect(0, 0, width, height), 50, out);
// byte[] imageBytes = out.toByteArray();
// Bitmap bmp = BitmapFactory.decodeByteArray(imageBytes, 0,
// imageBytes.length);
// Canvas canvas = holder.lockCanvas();
// canvas.drawBitmap(bmp, 0, 0, null);
// holder.unlockCanvasAndPost(canvas); }
static public void decodeYUV420SP(int[] rgba, byte[] yuv420sp, int width,
int height) {
final int frameSize = width * height;
for (int j = 0, yp = 0; j < height; j++) {
int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0)
y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0)
r = 0;
else if (r > 262143)
r = 262143;
if (g < 0)
g = 0;
else if (g > 262143)
g = 262143;
if (b < 0)
b = 0;
else if (b > 262143)
b = 262143;
// rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) &
// 0xff00) | ((b >> 10) & 0xff);
// rgba, divide 2^10 ( >> 10) rgba[yp] = ((r << 14) & 0xff000000) | ((g << 6) & 0xff0000)
| ((b >> 2) | 0xff00);
}
}
}
/**
* Converts YUV420 NV21 to RGB8888
*
* @param data
* byte array on YUV420 NV21 format.
* @param width
* pixels width
* @param height
* pixels height
* @return a RGB8888 pixels int array. Where each int is a pixels ARGB.
*/
public static void convertYUV420_NV21toRGB8888(int[] rgba, byte[] data,
int width, int height) {
int size = width * height;
int offset = size;
// int[] pixels = new int[size]; int u, v, y1, y2, y3, y4;
// i percorre os Y and the final pixels
// k percorre os pixles U e V for (int i = 0, k = 0; i < size; i += 2, k += 2) {
y1 = data[i] & 0xff;
y2 = data[i + 1] & 0xff;
y3 = data[width + i] & 0xff;
y4 = data[width + i + 1] & 0xff;
u = data[offset + k] & 0xff;
v = data[offset + k + 1] & 0xff;
u = u - 128;
v = v - 128;
rgba[i] = convertYUVtoRGB(y1, u, v);
rgba[i + 1] = convertYUVtoRGB(y2, u, v);
rgba[width + i] = convertYUVtoRGB(y3, u, v);
rgba[width + i + 1] = convertYUVtoRGB(y4, u, v);
if (i != 0 && (i + 2) % width == 0)
i += width;
}
// return pixels; }
private static int convertYUVtoRGB(int y, int u, int v) {
int r, g, b;
r = y + (int) 1.402f * v;
g = y - (int) (0.344f * u + 0.714f * v);
b = y + (int) 1.772f * u;
r = r > 255 ? 255 : r < 0 ? 0 : r;
g = g > 255 ? 255 : g < 0 ? 0 : g;
b = b > 255 ? 255 : b < 0 ? 0 : b;
return 0xff000000 | (b << 16) | (g << 8) | r;
}
// @Override
// public boolean onCreateOptionsMenu(Menu menu) {
//// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.activity_main, menu);
// return true;
// } public native String stringFromJNI();
private native void setVideoSurface(Surface surface);
private native void test(Surface surface);
private native void test2(Surface surface);
private native void drawYUV(int[] yuvData);
static {
System.loadLibrary("drawSurface");
}
}