forked from flutter/plugins
/
Camera.java
1173 lines (1047 loc) · 41.4 KB
/
Camera.java
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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
package io.flutter.plugins.camera;
import static android.view.OrientationEventListener.ORIENTATION_UNKNOWN;
import static io.flutter.plugins.camera.CameraUtils.computeBestPreviewSize;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.ImageFormat;
import android.graphics.Rect;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCaptureSession.CaptureCallback;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraMetadata;
import android.hardware.camera2.CaptureFailure;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.CaptureResult;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.MeteringRectangle;
import android.hardware.camera2.params.OutputConfiguration;
import android.hardware.camera2.params.SessionConfiguration;
import android.media.CamcorderProfile;
import android.media.Image;
import android.media.ImageReader;
import android.media.MediaRecorder;
import android.os.Build;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.util.Range;
import android.util.Rational;
import android.util.Size;
import android.view.OrientationEventListener;
import android.view.Surface;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import io.flutter.plugin.common.EventChannel;
import io.flutter.plugin.common.MethodChannel.Result;
import io.flutter.plugins.camera.PictureCaptureRequest.State;
import io.flutter.plugins.camera.media.MediaRecorderBuilder;
import io.flutter.plugins.camera.types.ExposureMode;
import io.flutter.plugins.camera.types.FlashMode;
import io.flutter.plugins.camera.types.FocusMode;
import io.flutter.plugins.camera.types.ResolutionPreset;
import io.flutter.view.TextureRegistry.SurfaceTextureEntry;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.Executors;
@FunctionalInterface
interface ErrorCallback {
void onError(String errorCode, String errorMessage);
}
public class Camera {
private static final String TAG = "Camera";
private final SurfaceTextureEntry flutterTexture;
private final CameraManager cameraManager;
private final OrientationEventListener orientationEventListener;
private final boolean isFrontFacing;
private final int sensorOrientation;
private final String cameraName;
private final Size captureSize;
private final Size previewSize;
private final boolean enableAudio;
private final Context applicationContext;
private final CamcorderProfile recordingProfile;
private final DartMessenger dartMessenger;
private final CameraZoom cameraZoom;
private final CameraCharacteristics cameraCharacteristics;
private CameraDevice cameraDevice;
private CameraCaptureSession cameraCaptureSession;
private ImageReader pictureImageReader;
private ImageReader imageStreamReader;
private CaptureRequest.Builder captureRequestBuilder;
private MediaRecorder mediaRecorder;
private boolean recordingVideo;
private File videoRecordingFile;
private int currentOrientation = ORIENTATION_UNKNOWN;
private FlashMode flashMode;
private ExposureMode exposureMode;
private FocusMode focusMode;
private PictureCaptureRequest pictureCaptureRequest;
private CameraRegions cameraRegions;
private int exposureOffset;
private boolean useAutoFocus = true;
private Range<Integer> fpsRange;
private static final HashMap<String, Integer> supportedImageFormats;
// Current supported outputs
static {
supportedImageFormats = new HashMap<>();
supportedImageFormats.put("yuv420", 35);
supportedImageFormats.put("jpeg", 256);
}
public Camera(
final Activity activity,
final SurfaceTextureEntry flutterTexture,
final DartMessenger dartMessenger,
final String cameraName,
final String resolutionPreset,
final boolean enableAudio)
throws CameraAccessException {
if (activity == null) {
throw new IllegalStateException("No activity available!");
}
this.cameraName = cameraName;
this.enableAudio = enableAudio;
this.flutterTexture = flutterTexture;
this.dartMessenger = dartMessenger;
this.cameraManager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
this.applicationContext = activity.getApplicationContext();
this.flashMode = FlashMode.auto;
this.exposureMode = ExposureMode.auto;
this.focusMode = FocusMode.auto;
this.exposureOffset = 0;
orientationEventListener =
new OrientationEventListener(activity.getApplicationContext()) {
@Override
public void onOrientationChanged(int i) {
if (i == ORIENTATION_UNKNOWN) {
return;
}
// Convert the raw deg angle to the nearest multiple of 90.
currentOrientation = (int) Math.round(i / 90.0) * 90;
}
};
orientationEventListener.enable();
cameraCharacteristics = cameraManager.getCameraCharacteristics(cameraName);
initFps(cameraCharacteristics);
sensorOrientation = cameraCharacteristics.get(CameraCharacteristics.SENSOR_ORIENTATION);
isFrontFacing =
cameraCharacteristics.get(CameraCharacteristics.LENS_FACING)
== CameraMetadata.LENS_FACING_FRONT;
ResolutionPreset preset = ResolutionPreset.valueOf(resolutionPreset);
recordingProfile =
CameraUtils.getBestAvailableCamcorderProfileForResolutionPreset(cameraName, preset);
captureSize = new Size(recordingProfile.videoFrameWidth, recordingProfile.videoFrameHeight);
previewSize = computeBestPreviewSize(cameraName, preset);
cameraZoom =
new CameraZoom(
cameraCharacteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE),
cameraCharacteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM));
}
private void initFps(CameraCharacteristics cameraCharacteristics) {
try {
Range<Integer>[] ranges =
cameraCharacteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);
if (ranges != null) {
for (Range<Integer> range : ranges) {
int upper = range.getUpper();
Log.i("Camera", "[FPS Range Available] is:" + range);
if (upper >= 10) {
if (fpsRange == null || upper > fpsRange.getUpper()) {
fpsRange = range;
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
Log.i("Camera", "[FPS Range] is:" + fpsRange);
}
private void prepareMediaRecorder(String outputFilePath) throws IOException {
if (mediaRecorder != null) {
mediaRecorder.release();
}
mediaRecorder =
new MediaRecorderBuilder(recordingProfile, outputFilePath)
.setEnableAudio(enableAudio)
.setMediaOrientation(getMediaOrientation())
.build();
}
@SuppressLint("MissingPermission")
public void open(String imageFormatGroup) throws CameraAccessException {
pictureImageReader =
ImageReader.newInstance(
captureSize.getWidth(), captureSize.getHeight(), ImageFormat.JPEG, 2);
Integer imageFormat = supportedImageFormats.get(imageFormatGroup);
if (imageFormat == null) {
Log.w(TAG, "The selected imageFormatGroup is not supported by Android. Defaulting to yuv420");
imageFormat = ImageFormat.YUV_420_888;
}
// Used to steam image byte data to dart side.
imageStreamReader =
ImageReader.newInstance(previewSize.getWidth(), previewSize.getHeight(), imageFormat, 2);
cameraManager.openCamera(
cameraName,
new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice device) {
cameraDevice = device;
try {
cameraRegions = new CameraRegions(getRegionBoundaries());
startPreview();
dartMessenger.sendCameraInitializedEvent(
previewSize.getWidth(),
previewSize.getHeight(),
exposureMode,
focusMode,
isExposurePointSupported(),
isFocusPointSupported());
} catch (CameraAccessException e) {
dartMessenger.sendCameraErrorEvent(e.getMessage());
close();
}
}
@Override
public void onClosed(@NonNull CameraDevice camera) {
dartMessenger.sendCameraClosingEvent();
super.onClosed(camera);
}
@Override
public void onDisconnected(@NonNull CameraDevice cameraDevice) {
close();
dartMessenger.sendCameraErrorEvent("The camera was disconnected.");
}
@Override
public void onError(@NonNull CameraDevice cameraDevice, int errorCode) {
close();
String errorDescription;
switch (errorCode) {
case ERROR_CAMERA_IN_USE:
errorDescription = "The camera device is in use already.";
break;
case ERROR_MAX_CAMERAS_IN_USE:
errorDescription = "Max cameras in use";
break;
case ERROR_CAMERA_DISABLED:
errorDescription = "The camera device could not be opened due to a device policy.";
break;
case ERROR_CAMERA_DEVICE:
errorDescription = "The camera device has encountered a fatal error";
break;
case ERROR_CAMERA_SERVICE:
errorDescription = "The camera service has encountered a fatal error.";
break;
default:
errorDescription = "Unknown camera error";
}
dartMessenger.sendCameraErrorEvent(errorDescription);
}
},
null);
}
private void createCaptureSession(int templateType, Surface... surfaces)
throws CameraAccessException {
createCaptureSession(templateType, null, surfaces);
}
private void createCaptureSession(
int templateType, Runnable onSuccessCallback, Surface... surfaces)
throws CameraAccessException {
// Close any existing capture session.
closeCaptureSession();
// Create a new capture builder.
captureRequestBuilder = cameraDevice.createCaptureRequest(templateType);
// Build Flutter surface to render to
SurfaceTexture surfaceTexture = flutterTexture.surfaceTexture();
surfaceTexture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
Surface flutterSurface = new Surface(surfaceTexture);
captureRequestBuilder.addTarget(flutterSurface);
List<Surface> remainingSurfaces = Arrays.asList(surfaces);
if (templateType != CameraDevice.TEMPLATE_PREVIEW) {
// If it is not preview mode, add all surfaces as targets.
for (Surface surface : remainingSurfaces) {
captureRequestBuilder.addTarget(surface);
}
}
// Prepare the callback
CameraCaptureSession.StateCallback callback =
new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
if (cameraDevice == null) {
dartMessenger.sendCameraErrorEvent("The camera was closed during configuration.");
return;
}
cameraCaptureSession = session;
updateFpsRange();
updateFocus(focusMode);
updateFlash(flashMode);
updateExposure(exposureMode);
refreshPreviewCaptureSession(
onSuccessCallback, (code, message) -> dartMessenger.sendCameraErrorEvent(message));
}
@Override
public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
dartMessenger.sendCameraErrorEvent("Failed to configure camera session.");
}
};
// Start the session
if (VERSION.SDK_INT >= VERSION_CODES.P) {
// Collect all surfaces we want to render to.
List<OutputConfiguration> configs = new ArrayList<>();
configs.add(new OutputConfiguration(flutterSurface));
for (Surface surface : remainingSurfaces) {
configs.add(new OutputConfiguration(surface));
}
createCaptureSessionWithSessionConfig(configs, callback);
} else {
// Collect all surfaces we want to render to.
List<Surface> surfaceList = new ArrayList<>();
surfaceList.add(flutterSurface);
surfaceList.addAll(remainingSurfaces);
createCaptureSession(surfaceList, callback);
}
}
@TargetApi(VERSION_CODES.P)
private void createCaptureSessionWithSessionConfig(
List<OutputConfiguration> outputConfigs, CameraCaptureSession.StateCallback callback)
throws CameraAccessException {
cameraDevice.createCaptureSession(
new SessionConfiguration(
SessionConfiguration.SESSION_REGULAR,
outputConfigs,
Executors.newSingleThreadExecutor(),
callback));
}
@TargetApi(VERSION_CODES.LOLLIPOP)
@SuppressWarnings("deprecation")
private void createCaptureSession(
List<Surface> surfaces, CameraCaptureSession.StateCallback callback)
throws CameraAccessException {
cameraDevice.createCaptureSession(surfaces, callback, null);
}
private void refreshPreviewCaptureSession(
@Nullable Runnable onSuccessCallback, @NonNull ErrorCallback onErrorCallback) {
if (cameraCaptureSession == null) {
return;
}
try {
cameraCaptureSession.setRepeatingRequest(
captureRequestBuilder.build(),
pictureCaptureCallback,
new Handler(Looper.getMainLooper()));
if (onSuccessCallback != null) {
onSuccessCallback.run();
}
} catch (CameraAccessException | IllegalStateException | IllegalArgumentException e) {
onErrorCallback.onError("cameraAccess", e.getMessage());
}
}
private void writeToFile(ByteBuffer buffer, File file) throws IOException {
try (FileOutputStream outputStream = new FileOutputStream(file)) {
while (0 < buffer.remaining()) {
outputStream.getChannel().write(buffer);
}
}
}
public void takePicture(@NonNull final Result result) {
// Only take 1 picture at a time
if (pictureCaptureRequest != null && !pictureCaptureRequest.isFinished()) {
result.error("captureAlreadyActive", "Picture is currently already being captured", null);
return;
}
// Store the result
this.pictureCaptureRequest = new PictureCaptureRequest(result);
// Create temporary file
final File outputDir = applicationContext.getCacheDir();
final File file;
try {
file = File.createTempFile("CAP", ".jpg", outputDir);
} catch (IOException | SecurityException e) {
pictureCaptureRequest.error("cannotCreateFile", e.getMessage(), null);
return;
}
// Listen for picture being taken
pictureImageReader.setOnImageAvailableListener(
reader -> {
try (Image image = reader.acquireLatestImage()) {
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
writeToFile(buffer, file);
pictureCaptureRequest.finish(file.getAbsolutePath());
} catch (IOException e) {
pictureCaptureRequest.error("IOError", "Failed saving image", null);
}
},
null);
if (useAutoFocus) {
runPictureAutoFocus();
} else {
runPicturePreCapture();
}
}
private final CameraCaptureSession.CaptureCallback pictureCaptureCallback =
new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
processCapture(result);
}
@Override
public void onCaptureProgressed(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull CaptureResult partialResult) {
processCapture(partialResult);
}
@Override
public void onCaptureFailed(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull CaptureFailure failure) {
if (pictureCaptureRequest == null || pictureCaptureRequest.isFinished()) {
return;
}
String reason;
switch (failure.getReason()) {
case CaptureFailure.REASON_ERROR:
reason = "An error happened in the framework";
break;
case CaptureFailure.REASON_FLUSHED:
reason = "The capture has failed due to an abortCaptures() call";
break;
default:
reason = "Unknown reason";
}
pictureCaptureRequest.error("captureFailure", reason, null);
}
private void processCapture(CaptureResult result) {
if (pictureCaptureRequest == null) {
return;
}
Integer aeState = result.get(CaptureResult.CONTROL_AE_STATE);
Integer afState = result.get(CaptureResult.CONTROL_AF_STATE);
switch (pictureCaptureRequest.getState()) {
case focusing:
if (afState == null) {
return;
} else if (afState == CaptureResult.CONTROL_AF_STATE_FOCUSED_LOCKED
|| afState == CaptureResult.CONTROL_AF_STATE_NOT_FOCUSED_LOCKED) {
// Some devices might return null here, in which case we will also continue.
if (aeState == null || aeState == CaptureResult.CONTROL_AE_STATE_CONVERGED) {
runPictureCapture();
} else {
runPicturePreCapture();
}
}
break;
case preCapture:
// Some devices might return null here, in which case we will also continue.
if (aeState == null
|| aeState == CaptureRequest.CONTROL_AE_STATE_PRECAPTURE
|| aeState == CaptureRequest.CONTROL_AE_STATE_FLASH_REQUIRED
|| aeState == CaptureRequest.CONTROL_AE_STATE_CONVERGED) {
pictureCaptureRequest.setState(State.waitingPreCaptureReady);
}
break;
case waitingPreCaptureReady:
if (aeState == null || aeState != CaptureRequest.CONTROL_AE_STATE_PRECAPTURE) {
runPictureCapture();
}
}
}
};
private void runPictureAutoFocus() {
assert (pictureCaptureRequest != null);
pictureCaptureRequest.setState(PictureCaptureRequest.State.focusing);
lockAutoFocus(pictureCaptureCallback);
}
private void runPicturePreCapture() {
assert (pictureCaptureRequest != null);
pictureCaptureRequest.setState(PictureCaptureRequest.State.preCapture);
captureRequestBuilder.set(
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_START);
refreshPreviewCaptureSession(
() ->
captureRequestBuilder.set(
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER,
CaptureRequest.CONTROL_AE_PRECAPTURE_TRIGGER_IDLE),
(code, message) -> pictureCaptureRequest.error(code, message, null));
}
private void runPictureCapture() {
assert (pictureCaptureRequest != null);
pictureCaptureRequest.setState(PictureCaptureRequest.State.capturing);
try {
final CaptureRequest.Builder captureBuilder =
cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(pictureImageReader.getSurface());
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getMediaOrientation());
switch (flashMode) {
case off:
captureBuilder.set(CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON);
captureBuilder.set(CaptureRequest.FLASH_MODE, CaptureRequest.FLASH_MODE_OFF);
break;
case auto:
captureBuilder.set(
CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
break;
case always:
default:
captureBuilder.set(
CaptureRequest.CONTROL_AE_MODE, CaptureRequest.CONTROL_AE_MODE_ON_ALWAYS_FLASH);
break;
}
cameraCaptureSession.stopRepeating();
cameraCaptureSession.capture(
captureBuilder.build(),
new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
unlockAutoFocus();
}
},
null);
} catch (CameraAccessException e) {
pictureCaptureRequest.error("cameraAccess", e.getMessage(), null);
}
}
private void lockAutoFocus(CaptureCallback callback) {
captureRequestBuilder.set(
CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_START);
refreshPreviewCaptureSession(
null, (code, message) -> pictureCaptureRequest.error(code, message, null));
}
private void unlockAutoFocus() {
captureRequestBuilder.set(
CaptureRequest.CONTROL_AF_TRIGGER, CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
updateFocus(focusMode);
try {
cameraCaptureSession.capture(captureRequestBuilder.build(), null, null);
} catch (CameraAccessException ignored) {
}
captureRequestBuilder.set(
CaptureRequest.CONTROL_AF_TRIGGER, CaptureRequest.CONTROL_AF_TRIGGER_IDLE);
refreshPreviewCaptureSession(
null,
(errorCode, errorMessage) -> pictureCaptureRequest.error(errorCode, errorMessage, null));
}
public void startVideoRecording(Result result) {
final File outputDir = applicationContext.getCacheDir();
try {
videoRecordingFile = File.createTempFile("REC", ".mp4", outputDir);
} catch (IOException | SecurityException e) {
result.error("cannotCreateFile", e.getMessage(), null);
return;
}
try {
prepareMediaRecorder(videoRecordingFile.getAbsolutePath());
recordingVideo = true;
createCaptureSession(
CameraDevice.TEMPLATE_RECORD, () -> mediaRecorder.start(), mediaRecorder.getSurface());
result.success(null);
} catch (CameraAccessException | IOException e) {
recordingVideo = false;
videoRecordingFile = null;
result.error("videoRecordingFailed", e.getMessage(), null);
}
}
public void stopVideoRecording(@NonNull final Result result) {
if (!recordingVideo) {
result.success(null);
return;
}
try {
recordingVideo = false;
try {
cameraCaptureSession.abortCaptures();
mediaRecorder.stop();
} catch (CameraAccessException | IllegalStateException e) {
// Ignore exceptions and try to continue (changes are camera session already aborted capture)
}
mediaRecorder.reset();
startPreview();
result.success(videoRecordingFile.getAbsolutePath());
videoRecordingFile = null;
} catch (CameraAccessException | IllegalStateException e) {
result.error("videoRecordingFailed", e.getMessage(), null);
}
}
public void pauseVideoRecording(@NonNull final Result result) {
if (!recordingVideo) {
result.success(null);
return;
}
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
mediaRecorder.pause();
} else {
result.error("videoRecordingFailed", "pauseVideoRecording requires Android API +24.", null);
return;
}
} catch (IllegalStateException e) {
result.error("videoRecordingFailed", e.getMessage(), null);
return;
}
result.success(null);
}
public void resumeVideoRecording(@NonNull final Result result) {
if (!recordingVideo) {
result.success(null);
return;
}
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
mediaRecorder.resume();
} else {
result.error(
"videoRecordingFailed", "resumeVideoRecording requires Android API +24.", null);
return;
}
} catch (IllegalStateException e) {
result.error("videoRecordingFailed", e.getMessage(), null);
return;
}
result.success(null);
}
public void setFlashMode(@NonNull final Result result, FlashMode mode)
throws CameraAccessException {
// Get the flash availability
Boolean flashAvailable =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.FLASH_INFO_AVAILABLE);
// Check if flash is available.
if (flashAvailable == null || !flashAvailable) {
result.error("setFlashModeFailed", "Device does not have flash capabilities", null);
return;
}
// If switching directly from torch to auto or on, make sure we turn off the torch.
if (flashMode == FlashMode.torch && mode != FlashMode.torch && mode != FlashMode.off) {
updateFlash(FlashMode.off);
this.cameraCaptureSession.setRepeatingRequest(
captureRequestBuilder.build(),
new CaptureCallback() {
private boolean isFinished = false;
@Override
public void onCaptureCompleted(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult captureResult) {
if (isFinished) {
return;
}
updateFlash(mode);
refreshPreviewCaptureSession(
() -> {
result.success(null);
isFinished = true;
},
(code, message) ->
result.error("setFlashModeFailed", "Could not set flash mode.", null));
}
@Override
public void onCaptureFailed(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull CaptureFailure failure) {
if (isFinished) {
return;
}
result.error("setFlashModeFailed", "Could not set flash mode.", null);
isFinished = true;
}
},
null);
} else {
updateFlash(mode);
refreshPreviewCaptureSession(
() -> result.success(null),
(code, message) -> result.error("setFlashModeFailed", "Could not set flash mode.", null));
}
}
public void setExposureMode(@NonNull final Result result, ExposureMode mode)
throws CameraAccessException {
updateExposure(mode);
cameraCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
result.success(null);
}
public void setExposurePoint(@NonNull final Result result, Double x, Double y)
throws CameraAccessException {
// Check if exposure point functionality is available.
if (!isExposurePointSupported()) {
result.error(
"setExposurePointFailed", "Device does not have exposure point capabilities", null);
return;
}
// Check if the current region boundaries are known
if (cameraRegions.getMaxBoundaries() == null) {
result.error("setExposurePointFailed", "Could not determine max region boundaries", null);
return;
}
// Set the metering rectangle
if (x == null || y == null) cameraRegions.resetAutoExposureMeteringRectangle();
else cameraRegions.setAutoExposureMeteringRectangleFromPoint(x, y);
// Apply it
updateExposure(exposureMode);
refreshPreviewCaptureSession(
() -> result.success(null), (code, message) -> result.error("CameraAccess", message, null));
}
public void setFocusMode(@NonNull final Result result, FocusMode mode)
throws CameraAccessException {
this.focusMode = mode;
updateFocus(mode);
switch (mode) {
case auto:
refreshPreviewCaptureSession(
null, (code, message) -> result.error("setFocusMode", message, null));
break;
case locked:
lockAutoFocus(
new CaptureCallback() {
@Override
public void onCaptureCompleted(
@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
unlockAutoFocus();
}
});
break;
}
result.success(null);
}
public void setFocusPoint(@NonNull final Result result, Double x, Double y)
throws CameraAccessException {
// Check if focus point functionality is available.
if (!isFocusPointSupported()) {
result.error("setFocusPointFailed", "Device does not have focus point capabilities", null);
return;
}
// Check if the current region boundaries are known
if (cameraRegions.getMaxBoundaries() == null) {
result.error("setFocusPointFailed", "Could not determine max region boundaries", null);
return;
}
// Set the metering rectangle
if (x == null || y == null) {
cameraRegions.resetAutoFocusMeteringRectangle();
} else {
cameraRegions.setAutoFocusMeteringRectangleFromPoint(x, y);
}
// Apply the new metering rectangle
setFocusMode(result, focusMode);
}
@TargetApi(VERSION_CODES.P)
private boolean supportsDistortionCorrection() throws CameraAccessException {
int[] availableDistortionCorrectionModes =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.DISTORTION_CORRECTION_AVAILABLE_MODES);
if (availableDistortionCorrectionModes == null) availableDistortionCorrectionModes = new int[0];
long nonOffModesSupported =
Arrays.stream(availableDistortionCorrectionModes)
.filter((value) -> value != CaptureRequest.DISTORTION_CORRECTION_MODE_OFF)
.count();
return nonOffModesSupported > 0;
}
private Size getRegionBoundaries() throws CameraAccessException {
// No distortion correction support
if (android.os.Build.VERSION.SDK_INT < VERSION_CODES.P || !supportsDistortionCorrection()) {
return cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.SENSOR_INFO_PIXEL_ARRAY_SIZE);
}
// Get the current distortion correction mode
Integer distortionCorrectionMode =
captureRequestBuilder.get(CaptureRequest.DISTORTION_CORRECTION_MODE);
// Return the correct boundaries depending on the mode
android.graphics.Rect rect;
if (distortionCorrectionMode == null
|| distortionCorrectionMode == CaptureRequest.DISTORTION_CORRECTION_MODE_OFF) {
rect =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE);
} else {
rect =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
}
return rect == null ? null : new Size(rect.width(), rect.height());
}
private boolean isExposurePointSupported() throws CameraAccessException {
Integer supportedRegions =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.CONTROL_MAX_REGIONS_AE);
return supportedRegions != null && supportedRegions > 0;
}
private boolean isFocusPointSupported() throws CameraAccessException {
Integer supportedRegions =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.CONTROL_MAX_REGIONS_AF);
return supportedRegions != null && supportedRegions > 0;
}
public double getMinExposureOffset() throws CameraAccessException {
Range<Integer> range =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.CONTROL_AE_COMPENSATION_RANGE);
double minStepped = range == null ? 0 : range.getLower();
double stepSize = getExposureOffsetStepSize();
return minStepped * stepSize;
}
public double getMaxExposureOffset() throws CameraAccessException {
Range<Integer> range =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.CONTROL_AE_COMPENSATION_RANGE);
double maxStepped = range == null ? 0 : range.getUpper();
double stepSize = getExposureOffsetStepSize();
return maxStepped * stepSize;
}
public double getExposureOffsetStepSize() throws CameraAccessException {
Rational stepSize =
cameraManager
.getCameraCharacteristics(cameraDevice.getId())
.get(CameraCharacteristics.CONTROL_AE_COMPENSATION_STEP);
return stepSize == null ? 0.0 : stepSize.doubleValue();
}
public void setExposureOffset(@NonNull final Result result, double offset)
throws CameraAccessException {
// Set the exposure offset
double stepSize = getExposureOffsetStepSize();
exposureOffset = (int) (offset / stepSize);
// Apply it
updateExposure(exposureMode);
this.cameraCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
result.success(offset);
}
public float getMaxZoomLevel() {
return cameraZoom.maxZoom;
}
public float getMinZoomLevel() {
return CameraZoom.DEFAULT_ZOOM_FACTOR;
}
public void setZoomLevel(@NonNull final Result result, float zoom) throws CameraAccessException {
float maxZoom = cameraZoom.maxZoom;
float minZoom = CameraZoom.DEFAULT_ZOOM_FACTOR;
if (zoom > maxZoom || zoom < minZoom) {
String errorMessage =
String.format(
Locale.ENGLISH,
"Zoom level out of bounds (zoom level should be between %f and %f).",
minZoom,
maxZoom);
result.error("ZOOM_ERROR", errorMessage, null);
return;
}
//Zoom area is calculated relative to sensor area (activeRect)
if (captureRequestBuilder != null) {
final Rect computedZoom = cameraZoom.computeZoom(zoom);
captureRequestBuilder.set(CaptureRequest.SCALER_CROP_REGION, computedZoom);
cameraCaptureSession.setRepeatingRequest(captureRequestBuilder.build(), null, null);
}
result.success(null);
}
private void updateFpsRange() {
if (fpsRange == null) {
return;
}
captureRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, fpsRange);
}
private void updateFocus(FocusMode mode) {
if (useAutoFocus) {
int[] modes = cameraCharacteristics.get(CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES);
// Auto focus is not supported
if (modes == null
|| modes.length == 0
|| (modes.length == 1 && modes[0] == CameraCharacteristics.CONTROL_AF_MODE_OFF)) {
useAutoFocus = false;
captureRequestBuilder.set(
CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_OFF);
} else {
// Applying auto focus
switch (mode) {
case locked:
captureRequestBuilder.set(
CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_AUTO);
break;
case auto:
captureRequestBuilder.set(
CaptureRequest.CONTROL_AF_MODE,
recordingVideo
? CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_VIDEO