package com.dreamy.cameraframedemo;

import android.app.Activity;
import android.graphics.ImageFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

import com.dreamy.cameraframedemo.util.ImageUtils;

 
import java.io.IOException;

public class MainActivity extends Activity implements SurfaceHolder.Callback,
        Camera.PreviewCallback, View.OnClickListener {
    // raw frame resolution: 1280x720, image format is: YV12
    // you need get all resolution that supported on your devices;
    // my phone is HUAWEI honor 6Plus, most devices can use 1280x720
 

    private static final int SRC_FRAME_WIDTH = 1280;
    private static final int SRC_FRAME_HEIGHT = 720;
    private static final int IMAGE_FORMAT = ImageFormat.YV12;

    private Camera mCamera;
    private Camera.Parameters mParams;
    private SurfaceView mSurfaceView;
    private SurfaceHolder mSurfaceHolder;

    @Override
    
 
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        setListener();
    }

    private void initView() {
        mSurfaceView = (SurfaceView) findViewById(R.id.sv_recording);
        mSurfaceHolder = mSurfaceView.getHolder();
        mSurfaceHolder.setFixedSize(SRC_FRAME_WIDTH, SRC_FRAME_HEIGHT);
        mSurfaceHolder.addCallback(this);
        mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    private void setListener() {
        // set Listener if you want, eg: onClickListener
    }

    @Override
    public void onClick(View v) {
    }

    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        ImageUtils.saveImageData(data);
        camera.addCallbackBuffer(data);
    }

    private void openCamera(SurfaceHolder holder) {
        releaseCamera(); // release Camera, if not release camera before call camera, it will be locked
        mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
        mParams = mCamera.getParameters();
        setCameraDisplayOrientation(this, Camera.CameraInfo.CAMERA_FACING_BACK, mCamera);
        mParams.setPreviewSize(SRC_FRAME_WIDTH, SRC_FRAME_HEIGHT);
        mParams.setPreviewFormat(IMAGE_FORMAT); // setting preview format：YV12
        mParams.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
        mCamera.setParameters(mParams); // setting camera parameters
        try {
            mCamera.setPreviewDisplay(holder);
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
        mCamera.setPreviewCallback(this);
        mCamera.startPreview();
    }

    private synchronized void releaseCamera() {
        if (mCamera != null) {
            try {
                mCamera.setPreviewCallback(null);
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                mCamera.stopPreview();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                mCamera.release();
            } catch (Exception e) {
                e.printStackTrace();
            }
            mCamera = null;
        }
    }

    /**
     * Android API: Display Orientation Setting
     * Just change screen display orientation,
     * the rawFrame data never be changed.
     */
    private void setCameraDisplayOrientation(Activity activity, int cameraId, Camera camera) {
        Camera.CameraInfo info = new Camera.CameraInfo();
        Camera.getCameraInfo(cameraId, info);
        int rotation = activity.getWindowManager().getDefaultDisplay()
                .getRotation();
        int degrees = 0;
        switch (rotation) {
            case Surface.ROTATION_0:
                degrees = 0;
                break;
            case Surface.ROTATION_90:
                degrees = 90;
                break;
            case Surface.ROTATION_180:
                degrees = 180;
                break;
            case Surface.ROTATION_270:
                degrees = 270;
                break;
        }
        int displayDegree;
        if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            displayDegree = (info.orientation + degrees) % 360;
            displayDegree = (360 - displayDegree) % 360;  // compensate the mirror
        } else {
            displayDegree = (info.orientation - degrees + 360) % 360;
        }
        camera.setDisplayOrientation(displayDegree);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        openCamera(holder); // open camera
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
    }
}