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CameraHandler.java
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CameraHandler.java
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package com.gscoder.androidglescamera2;
import android.content.Context;
import android.graphics.ImageFormat;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.ImageReader;
import android.os.Handler;
import android.os.HandlerThread;
import android.util.Log;
import android.util.Size;
import android.view.Surface;
import java.util.Arrays;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
public class CameraHandler {
private static final String TAG = CameraHandler.class.getSimpleName();
private CameraDevice mCameraDevice;
private CameraCaptureSession mCaptureSession;
private CaptureRequest.Builder mPreviewRequestBuilder;
private String mCameraID;
private Size mDesiredPreviewSize = null;
private Size mPreviewSize = null;
private HandlerThread mBackgroundThread;
private Handler mBackgroundHandler;
private Semaphore mCameraOpenCloseLock = new Semaphore(1);
private ImageReader mPreviewReader;
private int mFacing;
protected SurfaceTexture mSurfaceTexture;
private ImageReader.OnImageAvailableListener mOnImageAvailableListener;
public CameraHandler(ImageReader.OnImageAvailableListener onImageAvailableListener, Size desiredPreviewSize) {
mOnImageAvailableListener = onImageAvailableListener;
mDesiredPreviewSize = desiredPreviewSize;
}
public void setSurfaceTexture(SurfaceTexture surfaceTexture) {
mSurfaceTexture = surfaceTexture;
}
public int getFacing() {
return mFacing;
}
public Size getPreviewSize() {
if (mPreviewSize == null) {
throw new RuntimeException();
}
return mPreviewSize;
}
double distanceSq (Size one, Size two) {
double dY = one.getHeight() - two.getHeight();
double dX = one.getWidth() - two.getWidth();
return dY * dY + dX * dX;
}
void calcPreviewSize(Context context) {
CameraManager manager = (CameraManager)context.getSystemService(Context.CAMERA_SERVICE);
double distSq = Double.MAX_VALUE;
try {
for (String cameraID : manager.getCameraIdList()) {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraID);
if (characteristics.get(CameraCharacteristics.LENS_FACING) != CameraCharacteristics.LENS_FACING_FRONT)
continue;
mFacing = characteristics.get(CameraCharacteristics.LENS_FACING);
mCameraID = cameraID;
StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
for ( Size psize : map.getOutputSizes(SurfaceTexture.class)) {
double tmpDistSq = distanceSq(psize, mDesiredPreviewSize);
Log.i("mr", String.format("size %d x %d %f", psize.getWidth(), psize.getHeight(), tmpDistSq));
if ( tmpDistSq < distSq ) {
mPreviewSize = psize;
distSq = tmpDistSq;
Log.i("mr", String.format("mPreviewSize %d x %d", psize.getWidth(), psize.getHeight()));
}
}
break;
}
} catch ( CameraAccessException e ) {
Log.e("mr", "calcPreviewSize - Camera Access Exception");
} catch ( IllegalArgumentException e ) {
Log.e("mr", "calcPreviewSize - Illegal Argument Exception");
} catch ( SecurityException e ) {
Log.e("mr", "calcPreviewSize - Security Exception");
}
Log.i("mr", "camera size had to be chosen");
}
void openCamera(Context contexst) {
CameraManager manager = (CameraManager)contexst.getSystemService(Context.CAMERA_SERVICE);
try {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(mCameraID);
if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
throw new RuntimeException("Time out waiting to lock camera opening.");
}
manager.openCamera(mCameraID,mStateCallback,mBackgroundHandler);
} catch ( CameraAccessException e ) {
Log.e("mr", "OpenCamera - Camera Access Exception");
} catch ( IllegalArgumentException e ) {
Log.e("mr", "OpenCamera - Illegal Argument Exception");
} catch ( SecurityException e ) {
Log.e("mr", "OpenCamera - Security Exception");
} catch ( InterruptedException e ) {
Log.e("mr", "OpenCamera - Interrupted Exception");
}
}
protected void closeCamera() {
try {
mCameraOpenCloseLock.acquire();
if (null != mCaptureSession) {
mCaptureSession.close();
mCaptureSession = null;
}
if (null != mCameraDevice) {
mCameraDevice.close();
mCameraDevice = null;
}
} catch (InterruptedException e) {
throw new RuntimeException("Interrupted while trying to lock camera closing.", e);
} finally {
mCameraOpenCloseLock.release();
}
}
protected final CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice cameraDevice) {
mCameraOpenCloseLock.release();
mCameraDevice = cameraDevice;
createCameraPreviewSession();
}
@Override
public void onDisconnected(CameraDevice cameraDevice) {
mCameraOpenCloseLock.release();
cameraDevice.close();
mCameraDevice = null;
}
@Override
public void onError(CameraDevice cameraDevice, int error) {
mCameraOpenCloseLock.release();
cameraDevice.close();
mCameraDevice = null;
}
};
protected void createCameraPreviewSession() {
try {
mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mSurfaceTexture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
final Surface surface = new Surface(mSurfaceTexture);
mPreviewRequestBuilder.addTarget(surface);;
// Create the reader for the preview frames.
mPreviewReader =
ImageReader.newInstance(
mPreviewSize.getWidth(), mPreviewSize.getHeight(), ImageFormat.YUV_420_888, 2);
mPreviewReader.setOnImageAvailableListener(mOnImageAvailableListener, mBackgroundHandler);
mPreviewRequestBuilder.addTarget(mPreviewReader.getSurface());
mCameraDevice.createCaptureSession(Arrays.asList(surface, mPreviewReader.getSurface()),
new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession cameraCaptureSession) {
if (null == mCameraDevice)
return;
mCaptureSession = cameraCaptureSession;
try {
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
mCaptureSession.setRepeatingRequest(mPreviewRequestBuilder.build(), null, mBackgroundHandler);
} catch (CameraAccessException e) {
Log.e(TAG, "createCaptureSession");
}
}
@Override
public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
Log.e(TAG, "onConfigureFailed");
}
}, null
);
} catch (CameraAccessException e) {
Log.e(TAG, "createCameraPreviewSession");
}
}
protected void startBackgroundThread() {
mBackgroundThread = new HandlerThread("CameraBackground");
mBackgroundThread.start();
mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
}
protected void stopBackgroundThread() {
mBackgroundThread.quitSafely();
try {
mBackgroundThread.join();
mBackgroundThread = null;
mBackgroundHandler = null;
} catch (InterruptedException e) {
Log.e("mr", "stopBackgroundThread");
}
}
}