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Diffstat (limited to 'src/main/java/de/pixart/messenger/ui/service/CameraManager.java')
| -rw-r--r-- | src/main/java/de/pixart/messenger/ui/service/CameraManager.java | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/src/main/java/de/pixart/messenger/ui/service/CameraManager.java b/src/main/java/de/pixart/messenger/ui/service/CameraManager.java new file mode 100644 index 000000000..1c232928f --- /dev/null +++ b/src/main/java/de/pixart/messenger/ui/service/CameraManager.java @@ -0,0 +1,305 @@ +/* + * Copyright 2012-2015 the original author or authors. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +package de.pixart.messenger.ui.service; + +import android.annotation.SuppressLint; +import android.graphics.Rect; +import android.graphics.RectF; +import android.hardware.Camera; +import android.hardware.Camera.CameraInfo; +import android.util.Log; +import android.view.TextureView; + +import com.google.zxing.PlanarYUVLuminanceSource; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.Comparator; +import java.util.List; + +import de.pixart.messenger.Config; + +/** + * @author Andreas Schildbach + */ +@SuppressWarnings("deprecation") +public final class CameraManager { + private static final int MIN_FRAME_SIZE = 240; + private static final int MAX_FRAME_SIZE = 600; + private static final int MIN_PREVIEW_PIXELS = 470 * 320; // normal screen + private static final int MAX_PREVIEW_PIXELS = 1280 * 720; + + private Camera camera; + private CameraInfo cameraInfo = new CameraInfo(); + private Camera.Size cameraResolution; + private Rect frame; + private RectF framePreview; + + public Rect getFrame() { + return frame; + } + + public RectF getFramePreview() { + return framePreview; + } + + public int getFacing() { + return cameraInfo.facing; + } + + public int getOrientation() { + return cameraInfo.orientation; + } + + public Camera open(final TextureView textureView, final int displayOrientation, final boolean continuousAutoFocus) + throws IOException { + final int cameraId = determineCameraId(); + Camera.getCameraInfo(cameraId, cameraInfo); + + camera = Camera.open(cameraId); + + if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) + camera.setDisplayOrientation((720 - displayOrientation - cameraInfo.orientation) % 360); + else if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) + camera.setDisplayOrientation((720 - displayOrientation + cameraInfo.orientation) % 360); + else + throw new IllegalStateException("facing: " + cameraInfo.facing); + + camera.setPreviewTexture(textureView.getSurfaceTexture()); + + final Camera.Parameters parameters = camera.getParameters(); + + cameraResolution = findBestPreviewSizeValue(parameters, textureView.getWidth(), textureView.getHeight()); + + final int width = textureView.getWidth(); + final int height = textureView.getHeight(); + + final int rawSize = Math.min(width * 2 / 3, height * 2 / 3); + final int frameSize = Math.max(MIN_FRAME_SIZE, Math.min(MAX_FRAME_SIZE, rawSize)); + + final int leftOffset = (width - frameSize) / 2; + final int topOffset = (height - frameSize) / 2; + frame = new Rect(leftOffset, topOffset, leftOffset + frameSize, topOffset + frameSize); + framePreview = new RectF(frame.left * cameraResolution.width / width, + frame.top * cameraResolution.height / height, frame.right * cameraResolution.width / width, + frame.bottom * cameraResolution.height / height); + + final String savedParameters = parameters == null ? null : parameters.flatten(); + + try { + setDesiredCameraParameters(camera, cameraResolution, continuousAutoFocus); + } catch (final RuntimeException x) { + if (savedParameters != null) { + final Camera.Parameters parameters2 = camera.getParameters(); + parameters2.unflatten(savedParameters); + try { + camera.setParameters(parameters2); + setDesiredCameraParameters(camera, cameraResolution, continuousAutoFocus); + } catch (final RuntimeException x2) { + Log.d(Config.LOGTAG,"problem setting camera parameters", x2); + } + } + } + + try { + camera.startPreview(); + return camera; + } catch (final RuntimeException x) { + Log.w(Config.LOGTAG,"something went wrong while starting camera preview", x); + camera.release(); + throw x; + } + } + + private int determineCameraId() { + final int cameraCount = Camera.getNumberOfCameras(); + final CameraInfo cameraInfo = new CameraInfo(); + + // prefer back-facing camera + for (int i = 0; i < cameraCount; i++) { + Camera.getCameraInfo(i, cameraInfo); + if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) + return i; + } + + // fall back to front-facing camera + for (int i = 0; i < cameraCount; i++) { + Camera.getCameraInfo(i, cameraInfo); + if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) + return i; + } + + return -1; + } + + public void close() { + if (camera != null) { + try { + camera.stopPreview(); + } catch (final RuntimeException x) { + Log.w(Config.LOGTAG,"something went wrong while stopping camera preview", x); + } + + camera.release(); + } + } + + private static final Comparator<Camera.Size> numPixelComparator = new Comparator<Camera.Size>() { + @Override + public int compare(final Camera.Size size1, final Camera.Size size2) { + final int pixels1 = size1.height * size1.width; + final int pixels2 = size2.height * size2.width; + + if (pixels1 < pixels2) + return 1; + else if (pixels1 > pixels2) + return -1; + else + return 0; + } + }; + + private static Camera.Size findBestPreviewSizeValue(final Camera.Parameters parameters, int width, int height) { + if (height > width) { + final int temp = width; + width = height; + height = temp; + } + + final float screenAspectRatio = (float) width / (float) height; + + final List<Camera.Size> rawSupportedSizes = parameters.getSupportedPreviewSizes(); + if (rawSupportedSizes == null) + return parameters.getPreviewSize(); + + // sort by size, descending + final List<Camera.Size> supportedPreviewSizes = new ArrayList<Camera.Size>(rawSupportedSizes); + Collections.sort(supportedPreviewSizes, numPixelComparator); + + Camera.Size bestSize = null; + float diff = Float.POSITIVE_INFINITY; + + for (final Camera.Size supportedPreviewSize : supportedPreviewSizes) { + final int realWidth = supportedPreviewSize.width; + final int realHeight = supportedPreviewSize.height; + final int realPixels = realWidth * realHeight; + if (realPixels < MIN_PREVIEW_PIXELS || realPixels > MAX_PREVIEW_PIXELS) + continue; + + final boolean isCandidatePortrait = realWidth < realHeight; + final int maybeFlippedWidth = isCandidatePortrait ? realHeight : realWidth; + final int maybeFlippedHeight = isCandidatePortrait ? realWidth : realHeight; + if (maybeFlippedWidth == width && maybeFlippedHeight == height) + return supportedPreviewSize; + + final float aspectRatio = (float) maybeFlippedWidth / (float) maybeFlippedHeight; + final float newDiff = Math.abs(aspectRatio - screenAspectRatio); + if (newDiff < diff) { + bestSize = supportedPreviewSize; + diff = newDiff; + } + } + + if (bestSize != null) + return bestSize; + else + return parameters.getPreviewSize(); + } + + @SuppressLint("InlinedApi") + private static void setDesiredCameraParameters(final Camera camera, final Camera.Size cameraResolution, + final boolean continuousAutoFocus) { + final Camera.Parameters parameters = camera.getParameters(); + if (parameters == null) + return; + + final List<String> supportedFocusModes = parameters.getSupportedFocusModes(); + final String focusMode = continuousAutoFocus + ? findValue(supportedFocusModes, Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE, + Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO, Camera.Parameters.FOCUS_MODE_AUTO, + Camera.Parameters.FOCUS_MODE_MACRO) + : findValue(supportedFocusModes, Camera.Parameters.FOCUS_MODE_AUTO, Camera.Parameters.FOCUS_MODE_MACRO); + if (focusMode != null) + parameters.setFocusMode(focusMode); + + parameters.setPreviewSize(cameraResolution.width, cameraResolution.height); + + camera.setParameters(parameters); + } + + public void requestPreviewFrame(final android.hardware.Camera.PreviewCallback callback) { + try { + camera.setOneShotPreviewCallback(callback); + } catch (final RuntimeException x) { + Log.d(Config.LOGTAG,"problem requesting preview frame, callback won't be called", x); + } + } + + public PlanarYUVLuminanceSource buildLuminanceSource(final byte[] data) { + return new PlanarYUVLuminanceSource(data, cameraResolution.width, cameraResolution.height, + (int) framePreview.left, (int) framePreview.top, (int) framePreview.width(), + (int) framePreview.height(), false); + } + + private static boolean getTorchEnabled(final Camera camera) { + final Camera.Parameters parameters = camera.getParameters(); + if (parameters != null) { + final String flashMode = camera.getParameters().getFlashMode(); + return flashMode != null && (Camera.Parameters.FLASH_MODE_ON.equals(flashMode) + || Camera.Parameters.FLASH_MODE_TORCH.equals(flashMode)); + } + + return false; + } + + private static void setTorchEnabled(final Camera camera, final boolean enabled) { + final Camera.Parameters parameters = camera.getParameters(); + + final List<String> supportedFlashModes = parameters.getSupportedFlashModes(); + if (supportedFlashModes != null) { + final String flashMode; + if (enabled) + flashMode = findValue(supportedFlashModes, Camera.Parameters.FLASH_MODE_TORCH, + Camera.Parameters.FLASH_MODE_ON); + else + flashMode = findValue(supportedFlashModes, Camera.Parameters.FLASH_MODE_OFF); + + if (flashMode != null) { + camera.cancelAutoFocus(); // autofocus can cause conflict + + parameters.setFlashMode(flashMode); + camera.setParameters(parameters); + } + } + } + + private static String findValue(final Collection<String> values, final String... valuesToFind) { + for (final String valueToFind : valuesToFind) + if (values.contains(valueToFind)) + return valueToFind; + + return null; + } + + public void setTorch(final boolean enabled) { + if (enabled != getTorchEnabled(camera)) + setTorchEnabled(camera, enabled); + } +}
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