siebenhaarmi76624/MDT5_1_Ueberwachungssystem_G1
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added Video Decoder Class

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This commit is contained in:
Bastian Kohler 2023-05-12 18:45:13 +02:00
parent 354bf937b2
commit 323786859e
4 changed files with 188 additions and 19 deletions
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9
app/build.gradle
View File

@ -38,6 +38,11 @@ dependencies {
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
// Required for CameraX
implementation 'androidx.camera:camera-core:1.2.2'
implementation 'androidx.camera:camera-camera2:1.2.2'
def camerax_version = "1.2.2"
implementation "androidx.camera:camera-core:${camerax_version}"
implementation "androidx.camera:camera-camera2:${camerax_version}"
implementation "androidx.camera:camera-lifecycle:${camerax_version}"
implementation "androidx.camera:camera-video:${camerax_version}"
implementation "androidx.camera:camera-view:${camerax_version}"
implementation "androidx.camera:camera-extensions:${camerax_version}"
}

82
app/src/main/java/com/example/ueberwachungssystem/MainActivity.java
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@ -2,38 +2,69 @@ package com.example.ueberwachungssystem;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.camera.core.ExperimentalGetImage;
import androidx.lifecycle.LifecycleOwner;
import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.pm.PackageManager;
import android.graphics.ImageFormat;
import android.media.Image;
import android.os.Bundle;
import android.util.Log;
import android.util.Size;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.common.util.concurrent.ListenableFuture;
import java.nio.ByteBuffer;
import java.util.concurrent.ExecutionException;
@ExperimentalGetImage
public class MainActivity extends AppCompatActivity {
private static final int CAMERA_PERMISSION_REQUEST_CODE = 101;
private PreviewView previewView;
private TextView textView;
private Button previewButton;
private Boolean cameraPreviewIsRunning = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.textView);
previewView = findViewById(R.id.previewView);
previewButton = findViewById(R.id.previewButton);
Button B1 = findViewById(R.id.B1);
B1.setOnClickListener(new View.OnClickListener() {
VideoDetector vd = new VideoDetector(this);
previewButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
getCameraAccess();
if (isCameraAccessAllowed())
vd.runImageAnalysis();
}
});
}
private boolean isCameraAccessAllowed() {
return ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
}
@ -57,17 +88,38 @@ public class MainActivity extends AppCompatActivity {
}
}
private void showDialogue(String message) {
new AlertDialog.Builder(this)
.setMessage(message)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
private void previewCamera() {
// Request Camera Access
getCameraAccess();
// Return when Camera Access not allowed or Camera Preview is running
if (!isCameraAccessAllowed() || cameraPreviewIsRunning)
return;
// Camera Preview is running
cameraPreviewIsRunning = true;
// Request Camera Provider
final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(this);
//Check for Camera availability
cameraProviderFuture.addListener(new Runnable() {
@Override
public void onClick(DialogInterface dialog, int which) {
requestPermissions(new String[] {Manifest.permission.CAMERA}, CAMERA_PERMISSION_REQUEST_CODE);
}
})
.setNegativeButton("Cancel", null)
.create()
.show();
public void run() {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
bindPreview(cameraProvider);
} catch (ExecutionException | InterruptedException e) {
// No errors need to be handled for this Future. This should never be reached.
}
}
},ContextCompat.getMainExecutor(this));
}
private void bindPreview(@NonNull ProcessCameraProvider cameraProvider) {
// Create Preview
Preview preview = new Preview.Builder().build();
// Specify which Camera to use
CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
// Connect Preview to PreviewView
preview.setSurfaceProvider(previewView.getSurfaceProvider());
Camera camera = cameraProvider.bindToLifecycle((LifecycleOwner)this, cameraSelector, preview);
}
}

106
app/src/main/java/com/example/ueberwachungssystem/VideoDetector.java Normal file
View File

@ -0,0 +1,106 @@
package com.example.ueberwachungssystem;
import android.content.Context;
import android.graphics.ImageFormat;
import android.media.Image;
import android.util.Log;
import android.util.Size;
import androidx.annotation.NonNull;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ExperimentalGetImage;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.core.content.ContextCompat;
import androidx.lifecycle.LifecycleOwner;
import com.google.common.util.concurrent.ListenableFuture;
import java.nio.ByteBuffer;
import java.util.concurrent.ExecutionException;
@ExperimentalGetImage
public class VideoDetector {
private final Context context;
private float currentLuminosity;
public VideoDetector(Context context) {
this.context = context;
}
public void runImageAnalysis() {
// Request Camera Provider
final ListenableFuture<ProcessCameraProvider> cameraProviderFuture = ProcessCameraProvider.getInstance(context);
//Check for Camera availability
cameraProviderFuture.addListener(new Runnable() {
@Override
public void run() {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
bindImageAnalysis(cameraProvider);
} catch (ExecutionException | InterruptedException e) {
// No errors need to be handled for this Future. This should never be reached.
}
}
},ContextCompat.getMainExecutor(context));
}
private void bindImageAnalysis(@NonNull ProcessCameraProvider cameraProvider) {
// Configure and create Image Analysis
ImageAnalysis.Builder builder = new ImageAnalysis.Builder();
builder.setTargetResolution(new Size(640, 480));
builder.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST);
ImageAnalysis imageAnalysis = builder.build();
// Set Analyzer
imageAnalysis.setAnalyzer(ContextCompat.getMainExecutor(context), new ImageAnalysis.Analyzer() {
@Override
public void analyze(@NonNull ImageProxy imageProxy) {
if (imageProxy.getFormat() == ImageFormat.YUV_420_888) {
Image image = imageProxy.getImage();
assert image != null;
float luminosity = calculateLuminosity(image);
currentLuminosity = luminosity;
Log.d("Video Detector", String.valueOf(luminosity));
}
imageProxy.close();
}
});
// Create Preview
Preview preview = new Preview.Builder().build();
// Specify which Camera to use
CameraSelector cameraSelector = new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();
// Connect Preview to PreviewView
cameraProvider.bindToLifecycle((LifecycleOwner) context, cameraSelector, imageAnalysis, preview);
}
private float calculateLuminosity (Image image) {
int width = image.getWidth();
int height = image.getHeight();
Image.Plane[] planes = image.getPlanes();
ByteBuffer luminosityBuffer = planes[0].getBuffer();
int yRowStride = image.getPlanes()[0].getRowStride();
int yPixelStride = image.getPlanes()[0].getPixelStride();
int luminosity;
float sum = 0;
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; x++) {
int index = (y * yRowStride) + (x * yPixelStride);
luminosity = (luminosityBuffer.get(index) & 0xff);
sum += luminosity;
}
}
return sum / (width * height);
}
}

8
app/src/main/res/layout/activity_main.xml
View File

@ -10,6 +10,7 @@
tools:context=".MainActivity">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
@ -19,11 +20,16 @@
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/B1"
android:id="@+id/previewButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
tools:layout_editor_absoluteX="156dp"
tools:layout_editor_absoluteY="189dp" />
<androidx.camera.view.PreviewView
android:id="@+id/previewView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>