307 lines
12 KiB
Java
307 lines
12 KiB
Java
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/*
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* Copyright 2012-2015 the original author or authors.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package eu.siacs.conversations.ui.service;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import com.google.zxing.PlanarYUVLuminanceSource;
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import android.annotation.SuppressLint;
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import android.graphics.Rect;
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import android.graphics.RectF;
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import android.hardware.Camera;
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import android.hardware.Camera.CameraInfo;
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import android.hardware.Camera.PreviewCallback;
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import android.util.Log;
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import android.view.TextureView;
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import eu.siacs.conversations.Config;
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/**
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* @author Andreas Schildbach
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*/
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@SuppressWarnings("deprecation")
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public final class CameraManager {
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private static final int MIN_FRAME_SIZE = 240;
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private static final int MAX_FRAME_SIZE = 600;
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private static final int MIN_PREVIEW_PIXELS = 470 * 320; // normal screen
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private static final int MAX_PREVIEW_PIXELS = 1280 * 720;
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private Camera camera;
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private CameraInfo cameraInfo = new CameraInfo();
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private Camera.Size cameraResolution;
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private Rect frame;
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private RectF framePreview;
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public Rect getFrame() {
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return frame;
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}
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public RectF getFramePreview() {
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return framePreview;
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}
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public int getFacing() {
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return cameraInfo.facing;
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}
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public int getOrientation() {
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return cameraInfo.orientation;
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}
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public Camera open(final TextureView textureView, final int displayOrientation, final boolean continuousAutoFocus)
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throws IOException {
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final int cameraId = determineCameraId();
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Camera.getCameraInfo(cameraId, cameraInfo);
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camera = Camera.open(cameraId);
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if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
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camera.setDisplayOrientation((720 - displayOrientation - cameraInfo.orientation) % 360);
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else if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK)
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camera.setDisplayOrientation((720 - displayOrientation + cameraInfo.orientation) % 360);
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else
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throw new IllegalStateException("facing: " + cameraInfo.facing);
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camera.setPreviewTexture(textureView.getSurfaceTexture());
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final Camera.Parameters parameters = camera.getParameters();
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cameraResolution = findBestPreviewSizeValue(parameters, textureView.getWidth(), textureView.getHeight());
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final int width = textureView.getWidth();
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final int height = textureView.getHeight();
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final int rawSize = Math.min(width * 2 / 3, height * 2 / 3);
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final int frameSize = Math.max(MIN_FRAME_SIZE, Math.min(MAX_FRAME_SIZE, rawSize));
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final int leftOffset = (width - frameSize) / 2;
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final int topOffset = (height - frameSize) / 2;
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frame = new Rect(leftOffset, topOffset, leftOffset + frameSize, topOffset + frameSize);
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framePreview = new RectF(frame.left * cameraResolution.width / width,
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frame.top * cameraResolution.height / height, frame.right * cameraResolution.width / width,
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frame.bottom * cameraResolution.height / height);
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final String savedParameters = parameters == null ? null : parameters.flatten();
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try {
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setDesiredCameraParameters(camera, cameraResolution, continuousAutoFocus);
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} catch (final RuntimeException x) {
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if (savedParameters != null) {
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final Camera.Parameters parameters2 = camera.getParameters();
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parameters2.unflatten(savedParameters);
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try {
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camera.setParameters(parameters2);
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setDesiredCameraParameters(camera, cameraResolution, continuousAutoFocus);
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} catch (final RuntimeException x2) {
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Log.d(Config.LOGTAG,"problem setting camera parameters", x2);
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}
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}
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}
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try {
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camera.startPreview();
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return camera;
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} catch (final RuntimeException x) {
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Log.w(Config.LOGTAG,"something went wrong while starting camera preview", x);
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camera.release();
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throw x;
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}
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}
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private int determineCameraId() {
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final int cameraCount = Camera.getNumberOfCameras();
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final CameraInfo cameraInfo = new CameraInfo();
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// prefer back-facing camera
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for (int i = 0; i < cameraCount; i++) {
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Camera.getCameraInfo(i, cameraInfo);
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if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK)
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return i;
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}
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// fall back to front-facing camera
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for (int i = 0; i < cameraCount; i++) {
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Camera.getCameraInfo(i, cameraInfo);
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if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT)
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return i;
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}
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return -1;
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}
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public void close() {
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if (camera != null) {
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try {
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camera.stopPreview();
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} catch (final RuntimeException x) {
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Log.w(Config.LOGTAG,"something went wrong while stopping camera preview", x);
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}
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camera.release();
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}
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}
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private static final Comparator<Camera.Size> numPixelComparator = new Comparator<Camera.Size>() {
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@Override
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public int compare(final Camera.Size size1, final Camera.Size size2) {
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final int pixels1 = size1.height * size1.width;
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final int pixels2 = size2.height * size2.width;
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if (pixels1 < pixels2)
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return 1;
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else if (pixels1 > pixels2)
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return -1;
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else
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return 0;
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}
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};
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private static Camera.Size findBestPreviewSizeValue(final Camera.Parameters parameters, int width, int height) {
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if (height > width) {
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final int temp = width;
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width = height;
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height = temp;
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}
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final float screenAspectRatio = (float) width / (float) height;
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final List<Camera.Size> rawSupportedSizes = parameters.getSupportedPreviewSizes();
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if (rawSupportedSizes == null)
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return parameters.getPreviewSize();
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// sort by size, descending
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final List<Camera.Size> supportedPreviewSizes = new ArrayList<Camera.Size>(rawSupportedSizes);
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Collections.sort(supportedPreviewSizes, numPixelComparator);
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Camera.Size bestSize = null;
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float diff = Float.POSITIVE_INFINITY;
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for (final Camera.Size supportedPreviewSize : supportedPreviewSizes) {
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final int realWidth = supportedPreviewSize.width;
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final int realHeight = supportedPreviewSize.height;
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final int realPixels = realWidth * realHeight;
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if (realPixels < MIN_PREVIEW_PIXELS || realPixels > MAX_PREVIEW_PIXELS)
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continue;
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final boolean isCandidatePortrait = realWidth < realHeight;
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final int maybeFlippedWidth = isCandidatePortrait ? realHeight : realWidth;
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final int maybeFlippedHeight = isCandidatePortrait ? realWidth : realHeight;
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if (maybeFlippedWidth == width && maybeFlippedHeight == height)
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return supportedPreviewSize;
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final float aspectRatio = (float) maybeFlippedWidth / (float) maybeFlippedHeight;
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final float newDiff = Math.abs(aspectRatio - screenAspectRatio);
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if (newDiff < diff) {
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bestSize = supportedPreviewSize;
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diff = newDiff;
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}
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}
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if (bestSize != null)
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return bestSize;
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else
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return parameters.getPreviewSize();
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}
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@SuppressLint("InlinedApi")
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private static void setDesiredCameraParameters(final Camera camera, final Camera.Size cameraResolution,
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final boolean continuousAutoFocus) {
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final Camera.Parameters parameters = camera.getParameters();
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if (parameters == null)
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return;
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final List<String> supportedFocusModes = parameters.getSupportedFocusModes();
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final String focusMode = continuousAutoFocus
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? findValue(supportedFocusModes, Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE,
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Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO, Camera.Parameters.FOCUS_MODE_AUTO,
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Camera.Parameters.FOCUS_MODE_MACRO)
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: findValue(supportedFocusModes, Camera.Parameters.FOCUS_MODE_AUTO, Camera.Parameters.FOCUS_MODE_MACRO);
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if (focusMode != null)
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parameters.setFocusMode(focusMode);
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parameters.setPreviewSize(cameraResolution.width, cameraResolution.height);
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camera.setParameters(parameters);
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}
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public void requestPreviewFrame(final PreviewCallback callback) {
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try {
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camera.setOneShotPreviewCallback(callback);
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} catch (final RuntimeException x) {
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Log.d(Config.LOGTAG,"problem requesting preview frame, callback won't be called", x);
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}
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}
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public PlanarYUVLuminanceSource buildLuminanceSource(final byte[] data) {
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return new PlanarYUVLuminanceSource(data, cameraResolution.width, cameraResolution.height,
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(int) framePreview.left, (int) framePreview.top, (int) framePreview.width(),
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(int) framePreview.height(), false);
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}
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public void setTorch(final boolean enabled) {
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if (enabled != getTorchEnabled(camera))
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setTorchEnabled(camera, enabled);
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}
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private static boolean getTorchEnabled(final Camera camera) {
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final Camera.Parameters parameters = camera.getParameters();
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if (parameters != null) {
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final String flashMode = camera.getParameters().getFlashMode();
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return flashMode != null && (Camera.Parameters.FLASH_MODE_ON.equals(flashMode)
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|| Camera.Parameters.FLASH_MODE_TORCH.equals(flashMode));
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}
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return false;
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}
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private static void setTorchEnabled(final Camera camera, final boolean enabled) {
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final Camera.Parameters parameters = camera.getParameters();
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final List<String> supportedFlashModes = parameters.getSupportedFlashModes();
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if (supportedFlashModes != null) {
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final String flashMode;
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if (enabled)
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flashMode = findValue(supportedFlashModes, Camera.Parameters.FLASH_MODE_TORCH,
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Camera.Parameters.FLASH_MODE_ON);
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else
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flashMode = findValue(supportedFlashModes, Camera.Parameters.FLASH_MODE_OFF);
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if (flashMode != null) {
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camera.cancelAutoFocus(); // autofocus can cause conflict
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parameters.setFlashMode(flashMode);
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camera.setParameters(parameters);
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}
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}
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}
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private static String findValue(final Collection<String> values, final String... valuesToFind) {
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for (final String valueToFind : valuesToFind)
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if (values.contains(valueToFind))
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return valueToFind;
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return null;
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}
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}
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