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CameraView/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java

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package com.otaliastudios.cameraview.engine;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.graphics.ImageFormat;
import android.graphics.PointF;
import android.graphics.Rect;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.location.Location;
import android.os.Build;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import androidx.annotation.WorkerThread;
import android.view.SurfaceHolder;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.Tasks;
import com.otaliastudios.cameraview.CameraException;
import com.otaliastudios.cameraview.CameraLogger;
import com.otaliastudios.cameraview.CameraOptions;
import com.otaliastudios.cameraview.controls.Engine;
import com.otaliastudios.cameraview.engine.offset.Axis;
import com.otaliastudios.cameraview.engine.offset.Reference;
import com.otaliastudios.cameraview.frame.Frame;
import com.otaliastudios.cameraview.PictureResult;
import com.otaliastudios.cameraview.VideoResult;
import com.otaliastudios.cameraview.controls.Facing;
import com.otaliastudios.cameraview.controls.Flash;
import com.otaliastudios.cameraview.frame.FrameManager;
import com.otaliastudios.cameraview.gesture.Gesture;
import com.otaliastudios.cameraview.controls.Hdr;
import com.otaliastudios.cameraview.controls.Mode;
import com.otaliastudios.cameraview.controls.WhiteBalance;
import com.otaliastudios.cameraview.internal.utils.CropHelper;
import com.otaliastudios.cameraview.picture.Full1PictureRecorder;
import com.otaliastudios.cameraview.picture.Snapshot1PictureRecorder;
import com.otaliastudios.cameraview.picture.SnapshotGlPictureRecorder;
import com.otaliastudios.cameraview.preview.GlCameraPreview;
import com.otaliastudios.cameraview.size.AspectRatio;
import com.otaliastudios.cameraview.size.Size;
import com.otaliastudios.cameraview.video.Full1VideoRecorder;
import com.otaliastudios.cameraview.video.SnapshotVideoRecorder;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
@SuppressWarnings("deprecation")
public class Camera1Engine extends CameraEngine implements
Camera.PreviewCallback,
Camera.ErrorCallback,
FrameManager.BufferCallback {
private static final String TAG = Camera1Engine.class.getSimpleName();
private static final CameraLogger LOG = CameraLogger.create(TAG);
private static final int PREVIEW_FORMAT = ImageFormat.NV21;
@VisibleForTesting static final int AUTOFOCUS_END_DELAY_MILLIS = 2500;
private Camera mCamera;
@VisibleForTesting int mCameraId;
private Runnable mFocusEndRunnable;
public Camera1Engine(@NonNull Callback callback) {
super(callback);
mMapper = Mapper.get(Engine.CAMERA1);
}
//region Utilities
@Override
public void onError(int error, Camera camera) {
if (error == Camera.CAMERA_ERROR_SERVER_DIED) {
// Looks like this is recoverable.
LOG.w("Recoverable error inside the onError callback.", "CAMERA_ERROR_SERVER_DIED");
restart();
return;
}
String message = LOG.e("Internal Camera1 error.", error);
Exception runtime = new RuntimeException(message);
int reason;
switch (error) {
case Camera.CAMERA_ERROR_EVICTED: reason = CameraException.REASON_DISCONNECTED; break;
case Camera.CAMERA_ERROR_UNKNOWN: reason = CameraException.REASON_UNKNOWN; break;
default: reason = CameraException.REASON_UNKNOWN;
}
throw new CameraException(runtime, reason);
}
//endregion
//region Protected APIs
@NonNull
@Override
protected List<Size> getPreviewStreamAvailableSizes() {
List<Camera.Size> sizes = mCamera.getParameters().getSupportedPreviewSizes();
List<Size> result = new ArrayList<>(sizes.size());
for (Camera.Size size : sizes) {
Size add = new Size(size.width, size.height);
if (!result.contains(add)) result.add(add);
}
LOG.i("getPreviewStreamAvailableSizes:", result);
return result;
}
@WorkerThread
@Override
protected void onPreviewStreamSizeChanged() {
restartPreview();
}
@Override
protected boolean collectCameraInfo(@NonNull Facing facing) {
int internalFacing = mMapper.map(facing);
LOG.i("collectCameraInfo", "Facing:", facing, "Internal:", internalFacing, "Cameras:", Camera.getNumberOfCameras());
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
for (int i = 0, count = Camera.getNumberOfCameras(); i < count; i++) {
Camera.getCameraInfo(i, cameraInfo);
if (cameraInfo.facing == internalFacing) {
getAngles().setSensorOffset(facing, cameraInfo.orientation);
mCameraId = i;
return true;
}
}
return false;
}
//endregion
//region Start
@NonNull
@WorkerThread
@Override
protected Task<Void> onStartEngine() {
try {
mCamera = Camera.open(mCameraId);
} catch (Exception e) {
LOG.e("onStartEngine:", "Failed to connect. Maybe in use by another app?");
throw new CameraException(e, CameraException.REASON_FAILED_TO_CONNECT);
}
mCamera.setErrorCallback(this);
// Set parameters that might have been set before the camera was opened.
LOG.i("onStartEngine:", "Applying default parameters.");
Camera.Parameters params = mCamera.getParameters();
mCameraOptions = new CameraOptions(params, getAngles().flip(Reference.SENSOR, Reference.VIEW));
applyAllParameters(params);
mCamera.setParameters(params);
mCamera.setDisplayOrientation(getAngles().offset(Reference.SENSOR, Reference.VIEW, Axis.ABSOLUTE)); // <- not allowed during preview
LOG.i("onStartEngine:", "Ended");
return Tasks.forResult(null);
}
@NonNull
@Override
protected Task<Void> onStartBind() {
LOG.i("onStartBind:", "Started");
Object output = mPreview.getOutput();
try {
if (output instanceof SurfaceHolder) {
mCamera.setPreviewDisplay((SurfaceHolder) output);
} else if (output instanceof SurfaceTexture) {
mCamera.setPreviewTexture((SurfaceTexture) output);
} else {
throw new RuntimeException("Unknown CameraPreview output class.");
}
} catch (IOException e) {
LOG.e("onStartBind:", "Failed to bind.", e);
throw new CameraException(e, CameraException.REASON_FAILED_TO_START_PREVIEW);
}
mCaptureSize = computeCaptureSize();
mPreviewStreamSize = computePreviewStreamSize();
return Tasks.forResult(null);
}
@NonNull
@Override
protected Task<Void> onStartPreview() {
LOG.i("onStartPreview", "Dispatching onCameraPreviewStreamSizeChanged.");
mCallback.onCameraPreviewStreamSizeChanged();
Size previewSize = getPreviewStreamSize(Reference.VIEW);
if (previewSize == null) {
throw new IllegalStateException("previewStreamSize should not be null at this point.");
}
mPreview.setStreamSize(previewSize.getWidth(), previewSize.getHeight());
Camera.Parameters params = mCamera.getParameters();
params.setPreviewFormat(ImageFormat.NV21); // should be the default, but let's make sure, since YuvImage will only support this & a few others
params.setPreviewSize(mPreviewStreamSize.getWidth(), mPreviewStreamSize.getHeight()); // not allowed during preview
if (getMode() == Mode.PICTURE) {
params.setPictureSize(mCaptureSize.getWidth(), mCaptureSize.getHeight()); // allowed during preview
} else {
// mCaptureSize in this case is a video size. The available video sizes are not necessarily
// a subset of the picture sizes, so we can't use the mCaptureSize value: it might crash.
// However, the setPictureSize() passed here is useless : we don't allow HQ pictures in video mode.
// While this might be lifted in the future, for now, just use a picture capture size.
Size pictureSize = computeCaptureSize(Mode.PICTURE);
params.setPictureSize(pictureSize.getWidth(), pictureSize.getHeight());
}
mCamera.setParameters(params);
mCamera.setPreviewCallbackWithBuffer(null); // Release anything left
mCamera.setPreviewCallbackWithBuffer(this); // Add ourselves
getFrameManager().setUp(ImageFormat.getBitsPerPixel(PREVIEW_FORMAT), mPreviewStreamSize);
LOG.i("onStartPreview", "Starting preview with startPreview().");
try {
mCamera.startPreview();
} catch (Exception e) {
LOG.e("onStartPreview", "Failed to start preview.", e);
throw new CameraException(e, CameraException.REASON_FAILED_TO_START_PREVIEW);
}
LOG.i("onStartPreview", "Started preview.");
return Tasks.forResult(null);
}
//endregion
//region Stop
@NonNull
@Override
protected Task<Void> onStopPreview() {
if (mVideoRecorder != null) {
mVideoRecorder.stop();
mVideoRecorder = null;
}
mPictureRecorder = null;
getFrameManager().release();
mCamera.setPreviewCallbackWithBuffer(null); // Release anything left
try {
mCamera.stopPreview();
} catch (Exception e) {
LOG.e("stopPreview", "Could not stop preview", e);
}
return Tasks.forResult(null);
}
@NonNull
@Override
protected Task<Void> onStopBind() {
mPreviewStreamSize = null;
mCaptureSize = null;
try {
if (mPreview.getOutputClass() == SurfaceHolder.class) {
mCamera.setPreviewDisplay(null);
} else if (mPreview.getOutputClass() == SurfaceTexture.class) {
mCamera.setPreviewTexture(null);
} else {
throw new RuntimeException("Unknown CameraPreview output class.");
}
} catch (IOException e) {
LOG.e("unbindFromSurface", "Could not release surface", e);
}
return Tasks.forResult(null);
}
@NonNull
@WorkerThread
@Override
protected Task<Void> onStopEngine() {
LOG.i("onStopEngine:", "About to clean up.");
mHandler.remove(mFocusResetRunnable);
if (mFocusEndRunnable != null) {
mHandler.remove(mFocusEndRunnable);
}
if (mCamera != null) {
try {
LOG.i("onStopEngine:", "Clean up.", "Releasing camera.");
mCamera.release();
LOG.i("onStopEngine:", "Clean up.", "Released camera.");
} catch (Exception e) {
LOG.w("onStopEngine:", "Clean up.", "Exception while releasing camera.", e);
}
mCamera = null;
mCameraOptions = null;
}
mVideoRecorder = null;
mCameraOptions = null;
mCamera = null;
LOG.w("onStopEngine:", "Clean up.", "Returning.");
return Tasks.forResult(null);
}
//endregion
//region Pictures
@WorkerThread
@Override
protected void onTakePicture(@NonNull PictureResult.Stub stub) {
stub.rotation = getAngles().offset(Reference.SENSOR, Reference.OUTPUT, Axis.RELATIVE_TO_SENSOR);
stub.size = getPictureSize(Reference.OUTPUT);
mPictureRecorder = new Full1PictureRecorder(stub, Camera1Engine.this, mCamera);
mPictureRecorder.take();
}
@WorkerThread
@Override
protected void onTakePictureSnapshot(@NonNull PictureResult.Stub stub, @NonNull AspectRatio viewAspectRatio) {
stub.size = getUncroppedSnapshotSize(Reference.OUTPUT); // Not the real size: it will be cropped to match the view ratio
stub.rotation = getAngles().offset(Reference.SENSOR, Reference.OUTPUT, Axis.RELATIVE_TO_SENSOR); // Actually it will be rotated and set to 0.
AspectRatio outputRatio = getAngles().flip(Reference.OUTPUT, Reference.VIEW) ? viewAspectRatio.flip() : viewAspectRatio;
if (mPreview instanceof GlCameraPreview && Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
mPictureRecorder = new SnapshotGlPictureRecorder(stub, this, (GlCameraPreview) mPreview, outputRatio);
} else {
mPictureRecorder = new Snapshot1PictureRecorder(stub, this, mCamera, outputRatio);
}
mPictureRecorder.take();
}
//endregion
//region Videos
@Override
protected void onTakeVideo(@NonNull VideoResult.Stub stub) {
stub.rotation = getAngles().offset(Reference.SENSOR, Reference.OUTPUT, Axis.RELATIVE_TO_SENSOR);
stub.size = getAngles().flip(Reference.SENSOR, Reference.OUTPUT) ? mCaptureSize.flip() : mCaptureSize;
// Unlock the camera and start recording.
try {
mCamera.unlock();
} catch (Exception e) {
// If this failed, we are unlikely able to record the video.
// Dispatch an error.
onVideoResult(null, e);
return;
}
mVideoRecorder = new Full1VideoRecorder(Camera1Engine.this, mCamera, mCameraId);
mVideoRecorder.start(stub);
}
@SuppressLint("NewApi")
@WorkerThread
@Override
protected void onTakeVideoSnapshot(@NonNull VideoResult.Stub stub, @NonNull AspectRatio viewAspectRatio) {
if (!(mPreview instanceof GlCameraPreview)) {
throw new IllegalStateException("Video snapshots are only supported with GlCameraPreview.");
}
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR2) {
throw new IllegalStateException("Video snapshots are only supported starting from API 18.");
}
GlCameraPreview glPreview = (GlCameraPreview) mPreview;
Size outputSize = getUncroppedSnapshotSize(Reference.OUTPUT);
if (outputSize == null) {
throw new IllegalStateException("outputSize should not be null.");
}
AspectRatio outputRatio = getAngles().flip(Reference.VIEW, Reference.OUTPUT) ? viewAspectRatio.flip() : viewAspectRatio;
Rect outputCrop = CropHelper.computeCrop(outputSize, outputRatio);
outputSize = new Size(outputCrop.width(), outputCrop.height());
stub.size = outputSize;
stub.rotation = getAngles().offset(Reference.VIEW, Reference.OUTPUT, Axis.ABSOLUTE);
// Start.
mVideoRecorder = new SnapshotVideoRecorder(Camera1Engine.this, glPreview);
mVideoRecorder.start(stub);
}
@Override
public void onVideoResult(@Nullable VideoResult.Stub result, @Nullable Exception exception) {
super.onVideoResult(result, exception);
if (result == null) {
// Something went wrong, lock the camera again.
mCamera.lock();
}
}
//endregion
//region Parameters
private void applyAllParameters(@NonNull Camera.Parameters params) {
params.setRecordingHint(getMode() == Mode.VIDEO);
applyDefaultFocus(params);
applyFlash(params, Flash.OFF);
applyLocation(params, null);
applyWhiteBalance(params, WhiteBalance.AUTO);
applyHdr(params, Hdr.OFF);
applyZoom(params, 0F);
applyExposureCorrection(params, 0F);
applyPlaySounds(mPlaySounds);
}
private void applyDefaultFocus(@NonNull Camera.Parameters params) {
List<String> modes = params.getSupportedFocusModes();
if (getMode() == Mode.VIDEO &&
modes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
return;
}
if (modes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
params.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
return;
}
if (modes.contains(Camera.Parameters.FOCUS_MODE_INFINITY)) {
params.setFocusMode(Camera.Parameters.FOCUS_MODE_INFINITY);
return;
}
if (modes.contains(Camera.Parameters.FOCUS_MODE_FIXED)) {
params.setFocusMode(Camera.Parameters.FOCUS_MODE_FIXED);
//noinspection UnnecessaryReturnStatement
return;
}
}
@Override
public void setFlash(@NonNull Flash flash) {
final Flash old = mFlash;
mFlash = flash;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
Camera.Parameters params = mCamera.getParameters();
if (applyFlash(params, old)) mCamera.setParameters(params);
}
mFlashOp.end(null);
}
});
}
private boolean applyFlash(@NonNull Camera.Parameters params, @NonNull Flash oldFlash) {
if (mCameraOptions.supports(mFlash)) {
params.setFlashMode((String) mMapper.map(mFlash));
return true;
}
mFlash = oldFlash;
return false;
}
@Override
public void setLocation(@Nullable Location location) {
final Location oldLocation = mLocation;
mLocation = location;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
Camera.Parameters params = mCamera.getParameters();
if (applyLocation(params, oldLocation)) mCamera.setParameters(params);
}
mLocationOp.end(null);
}
});
}
private boolean applyLocation(@NonNull Camera.Parameters params,
@SuppressWarnings("unused") @Nullable Location oldLocation) {
if (mLocation != null) {
params.setGpsLatitude(mLocation.getLatitude());
params.setGpsLongitude(mLocation.getLongitude());
params.setGpsAltitude(mLocation.getAltitude());
params.setGpsTimestamp(mLocation.getTime());
params.setGpsProcessingMethod(mLocation.getProvider());
}
return true;
}
@Override
public void setWhiteBalance(@NonNull WhiteBalance whiteBalance) {
final WhiteBalance old = mWhiteBalance;
mWhiteBalance = whiteBalance;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
Camera.Parameters params = mCamera.getParameters();
if (applyWhiteBalance(params, old)) mCamera.setParameters(params);
}
mWhiteBalanceOp.end(null);
}
});
}
private boolean applyWhiteBalance(@NonNull Camera.Parameters params, @NonNull WhiteBalance oldWhiteBalance) {
if (mCameraOptions.supports(mWhiteBalance)) {
params.setWhiteBalance((String) mMapper.map(mWhiteBalance));
return true;
}
mWhiteBalance = oldWhiteBalance;
return false;
}
@Override
public void setHdr(@NonNull Hdr hdr) {
final Hdr old = mHdr;
mHdr = hdr;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
Camera.Parameters params = mCamera.getParameters();
if (applyHdr(params, old)) mCamera.setParameters(params);
}
mHdrOp.end(null);
}
});
}
private boolean applyHdr(@NonNull Camera.Parameters params, @NonNull Hdr oldHdr) {
if (mCameraOptions.supports(mHdr)) {
params.setSceneMode((String) mMapper.map(mHdr));
return true;
}
mHdr = oldHdr;
return false;
}
@Override
public void setZoom(final float zoom, @Nullable final PointF[] points, final boolean notify) {
final float old = mZoomValue;
mZoomValue = zoom;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
Camera.Parameters params = mCamera.getParameters();
if (applyZoom(params, old)) {
mCamera.setParameters(params);
if (notify) {
mCallback.dispatchOnZoomChanged(mZoomValue, points);
}
}
}
mZoomOp.end(null);
}
});
}
private boolean applyZoom(@NonNull Camera.Parameters params, float oldZoom) {
if (mCameraOptions.isZoomSupported()) {
float max = params.getMaxZoom();
params.setZoom((int) (mZoomValue * max));
mCamera.setParameters(params);
return true;
}
mZoomValue = oldZoom;
return false;
}
@Override
public void setExposureCorrection(final float EVvalue, @NonNull final float[] bounds,
@Nullable final PointF[] points, final boolean notify) {
final float old = mExposureCorrectionValue;
mExposureCorrectionValue = EVvalue;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
Camera.Parameters params = mCamera.getParameters();
if (applyExposureCorrection(params, old)) {
mCamera.setParameters(params);
if (notify) {
mCallback.dispatchOnExposureCorrectionChanged(mExposureCorrectionValue, bounds, points);
}
}
}
mExposureCorrectionOp.end(null);
}
});
}
private boolean applyExposureCorrection(@NonNull Camera.Parameters params, float oldExposureCorrection) {
if (mCameraOptions.isExposureCorrectionSupported()) {
// Just make sure we're inside boundaries.
float max = mCameraOptions.getExposureCorrectionMaxValue();
float min = mCameraOptions.getExposureCorrectionMinValue();
float val = mExposureCorrectionValue;
val = val < min ? min : val > max ? max : val; // cap
mExposureCorrectionValue = val;
// Apply.
int indexValue = (int) (mExposureCorrectionValue / params.getExposureCompensationStep());
params.setExposureCompensation(indexValue);
return true;
}
mExposureCorrectionValue = oldExposureCorrection;
return false;
}
@Override
public void setPlaySounds(boolean playSounds) {
final boolean old = mPlaySounds;
mPlaySounds = playSounds;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() == STATE_STARTED) {
applyPlaySounds(old);
}
mPlaySoundsOp.end(null);
}
});
}
@SuppressWarnings("UnusedReturnValue")
@TargetApi(17)
private boolean applyPlaySounds(boolean oldPlaySound) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(mCameraId, info);
if (info.canDisableShutterSound) {
try {
// this method is documented to throw on some occasions. #377
return mCamera.enableShutterSound(mPlaySounds);
} catch (RuntimeException exception) {
return false;
}
}
}
if (mPlaySounds) {
return true;
}
mPlaySounds = oldPlaySound;
return false;
}
//endregion
//region Frame Processing
@NonNull
@Override
protected FrameManager instantiateFrameManager() {
return new FrameManager(2, this);
}
@Override
public void onBufferAvailable(@NonNull byte[] buffer) {
if (getEngineState() == STATE_STARTED) {
mCamera.addCallbackBuffer(buffer);
}
}
@Override
public void onPreviewFrame(@NonNull byte[] data, Camera camera) {
Frame frame = getFrameManager().getFrame(data,
System.currentTimeMillis(),
getAngles().offset(Reference.SENSOR, Reference.OUTPUT, Axis.RELATIVE_TO_SENSOR),
mPreviewStreamSize,
PREVIEW_FORMAT);
mCallback.dispatchFrame(frame);
}
//endregion
//region Auto Focus
@Override
public void startAutoFocus(@Nullable final Gesture gesture, @NonNull final PointF point) {
// Must get width and height from the UI thread.
// TODO could take mPreview.surfaceSize like Camera2 does?
int viewWidth = 0, viewHeight = 0;
if (mPreview != null && mPreview.hasSurface()) {
viewWidth = mPreview.getView().getWidth();
viewHeight = mPreview.getView().getHeight();
}
final int viewWidthF = viewWidth;
final int viewHeightF = viewHeight;
mHandler.run(new Runnable() {
@Override
public void run() {
if (getEngineState() < STATE_STARTED) return;
if (!mCameraOptions.isAutoFocusSupported()) return;
final PointF p = new PointF(point.x, point.y); // copy.
int offset = getAngles().offset(Reference.SENSOR, Reference.VIEW, Axis.ABSOLUTE);
List<Camera.Area> meteringAreas2 = computeMeteringAreas(p.x, p.y,
viewWidthF, viewHeightF, offset);
List<Camera.Area> meteringAreas1 = meteringAreas2.subList(0, 1);
// At this point we are sure that camera supports auto focus... right? Look at CameraView.onTouchEvent().
Camera.Parameters params = mCamera.getParameters();
int maxAF = params.getMaxNumFocusAreas();
int maxAE = params.getMaxNumMeteringAreas();
if (maxAF > 0) params.setFocusAreas(maxAF > 1 ? meteringAreas2 : meteringAreas1);
if (maxAE > 0) params.setMeteringAreas(maxAE > 1 ? meteringAreas2 : meteringAreas1);
params.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.setParameters(params);
mCallback.dispatchOnFocusStart(gesture, p);
// The auto focus callback is not guaranteed to be called, but we really want it to be.
// So we remove the old runnable if still present and post a new one.
if (mFocusEndRunnable != null) mHandler.remove(mFocusEndRunnable);
mFocusEndRunnable = new Runnable() {
@Override
public void run() {
mCallback.dispatchOnFocusEnd(gesture, false, p);
}
};
mHandler.post(AUTOFOCUS_END_DELAY_MILLIS, mFocusEndRunnable);
// Wrapping autoFocus in a try catch to handle some device specific exceptions,
// see See https://github.com/natario1/CameraView/issues/181.
try {
mCamera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
if (mFocusEndRunnable != null) {
mHandler.remove(mFocusEndRunnable);
mFocusEndRunnable = null;
}
mCallback.dispatchOnFocusEnd(gesture, success, p);
mHandler.remove(mFocusResetRunnable);
if (shouldResetAutoFocus()) {
mHandler.post(getAutoFocusResetDelay(), mFocusResetRunnable);
}
}
});
} catch (RuntimeException e) {
LOG.e("startAutoFocus:", "Error calling autoFocus", e);
// Let the mFocusEndRunnable do its job. (could remove it and quickly dispatch
// onFocusEnd here, but let's make it simpler).
}
}
});
}
@NonNull
@WorkerThread
private static List<Camera.Area> computeMeteringAreas(double viewClickX, double viewClickY,
int viewWidth, int viewHeight,
int sensorToDisplay) {
// Event came in view coordinates. We must rotate to sensor coordinates.
// First, rescale to the -1000 ... 1000 range.
int displayToSensor = -sensorToDisplay;
viewClickX = -1000d + (viewClickX / (double) viewWidth) * 2000d;
viewClickY = -1000d + (viewClickY / (double) viewHeight) * 2000d;
// Apply rotation to this point.
// https://academo.org/demos/rotation-about-point/
double theta = ((double) displayToSensor) * Math.PI / 180;
double sensorClickX = viewClickX * Math.cos(theta) - viewClickY * Math.sin(theta);
double sensorClickY = viewClickX * Math.sin(theta) + viewClickY * Math.cos(theta);
LOG.i("focus:", "viewClickX:", viewClickX, "viewClickY:", viewClickY);
LOG.i("focus:", "sensorClickX:", sensorClickX, "sensorClickY:", sensorClickY);
// Compute the rect bounds.
Rect rect1 = computeMeteringArea(sensorClickX, sensorClickY, 150d);
int weight1 = 1000; // 150 * 150 * 1000 = more than 10.000.000
Rect rect2 = computeMeteringArea(sensorClickX, sensorClickY, 300d);
int weight2 = 100; // 300 * 300 * 100 = 9.000.000
List<Camera.Area> list = new ArrayList<>(2);
list.add(new Camera.Area(rect1, weight1));
list.add(new Camera.Area(rect2, weight2));
return list;
}
@NonNull
private static Rect computeMeteringArea(double centerX, double centerY, double size) {
double delta = size / 2d;
int top = (int) Math.max(centerY - delta, -1000);
int bottom = (int) Math.min(centerY + delta, 1000);
int left = (int) Math.max(centerX - delta, -1000);
int right = (int) Math.min(centerX + delta, 1000);
LOG.i("focus:", "computeMeteringArea:", "top:", top, "left:", left, "bottom:", bottom, "right:", right);
return new Rect(left, top, right, bottom);
}
private final Runnable mFocusResetRunnable = new Runnable() {
@Override
public void run() {
if (getEngineState() < STATE_STARTED) return;
mCamera.cancelAutoFocus();
Camera.Parameters params = mCamera.getParameters();
int maxAF = params.getMaxNumFocusAreas();
int maxAE = params.getMaxNumMeteringAreas();
if (maxAF > 0) params.setFocusAreas(null);
if (maxAE > 0) params.setMeteringAreas(null);
applyDefaultFocus(params); // Revert to internal focus.
mCamera.setParameters(params);
}
};
//endregion
}