core/java/android/hardware/camera2/CaptureResult.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.hardware.camera2;

import android.hardware.camera2.impl.CameraMetadataNative;

/**
 * <p>The results of a single image capture from the image sensor.</p>
 *
 * <p>Contains the final configuration for the capture hardware (sensor, lens,
 * flash), the processing pipeline, the control algorithms, and the output
 * buffers.</p>
 *
 * <p>CaptureResults are produced by a {@link CameraDevice} after processing a
 * {@link CaptureRequest}. All properties listed for capture requests can also
 * be queried on the capture result, to determine the final values used for
 * capture. The result also includes additional metadata about the state of the
 * camera device during the capture.</p>
 *
 */
public final class CaptureResult extends CameraMetadata {

    private final CameraMetadataNative mResults;
    private final CaptureRequest mRequest;
    private final int mSequenceId;

    /**
     * Takes ownership of the passed-in properties object
     * @hide
     */
    public CaptureResult(CameraMetadataNative results, CaptureRequest parent, int sequenceId) {
        if (results == null) {
            throw new IllegalArgumentException("results was null");
        }

        if (parent == null) {
            throw new IllegalArgumentException("parent was null");
        }

        mResults = results;
        mRequest = parent;
        mSequenceId = sequenceId;
    }

    @Override
    public <T> T get(Key<T> key) {
        return mResults.get(key);
    }

    /**
     * Get the request associated with this result.
     *
     * <p>Whenever a request is successfully captured, with
     * {@link CameraDevice.CaptureListener#onCaptureCompleted},
     * the {@code result}'s {@code getRequest()} will return that {@code request}.
     * </p>
     *
     * <p>In particular,
     * <code><pre>cameraDevice.capture(someRequest, new CaptureListener() {
     *     {@literal @}Override
     *     void onCaptureCompleted(CaptureRequest myRequest, CaptureResult myResult) {
     *         assert(myResult.getRequest.equals(myRequest) == true);
     *     }
     * };
     * </code></pre>
     * </p>
     *
     * @return The request associated with this result. Never {@code null}.
     */
    public CaptureRequest getRequest() {
        return mRequest;
    }

    /**
     * Get the frame number associated with this result.
     *
     * <p>Whenever a request has been processed, regardless of failure or success,
     * it gets a unique frame number assigned to its future result/failure.</p>
     *
     * <p>This value monotonically increments, starting with 0,
     * for every new result or failure; and the scope is the lifetime of the
     * {@link CameraDevice}.</p>
     *
     * @return int frame number
     */
    public int getFrameNumber() {
        return get(REQUEST_FRAME_COUNT);
    }

    /**
     * The sequence ID for this failure that was returned by the
     * {@link CameraDevice#capture} family of functions.
     *
     * <p>The sequence ID is a unique monotonically increasing value starting from 0,
     * incremented every time a new group of requests is submitted to the CameraDevice.</p>
     *
     * @return int The ID for the sequence of requests that this capture result is a part of
     *
     * @see CameraDevice.CaptureListener#onCaptureSequenceCompleted
     */
    public int getSequenceId() {
        return mSequenceId;
    }

    /*@O~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~
     * The key entries below this point are generated from metadata
     * definitions in /system/media/camera/docs. Do not modify by hand or
     * modify the comment blocks at the start or end.
     *~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~*/


    /**
     * <p>A color transform matrix to use to transform
     * from sensor RGB color space to output linear sRGB color space</p>
     * <p>This matrix is either set by HAL when the request
     * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is not TRANSFORM_MATRIX, or
     * directly by the application in the request when the
     * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is TRANSFORM_MATRIX.</p>
     * <p>In the latter case, the HAL may round the matrix to account
     * for precision issues; the final rounded matrix should be
     * reported back in this matrix result metadata.</p>
     *
     * @see CaptureRequest#COLOR_CORRECTION_MODE
     */
    public static final Key<Rational[]> COLOR_CORRECTION_TRANSFORM =
            new Key<Rational[]>("android.colorCorrection.transform", Rational[].class);

    /**
     * <p>Gains applying to Bayer color channels for
     * white-balance</p>
     * <p>The 4-channel white-balance gains are defined in
     * the order of [R G_even G_odd B], where G_even is the gain
     * for green pixels on even rows of the output, and G_odd
     * is the gain for greenpixels on the odd rows. if a HAL
     * does not support a separate gain for even/odd green channels,
     * it should use the G_even value,and write G_odd equal to
     * G_even in the output result metadata.</p>
     * <p>This array is either set by HAL when the request
     * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is not TRANSFORM_MATRIX, or
     * directly by the application in the request when the
     * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} is TRANSFORM_MATRIX.</p>
     * <p>The ouput should be the gains actually applied by the HAL to
     * the current frame.</p>
     *
     * @see CaptureRequest#COLOR_CORRECTION_MODE
     */
    public static final Key<float[]> COLOR_CORRECTION_GAINS =
            new Key<float[]>("android.colorCorrection.gains", float[].class);

    /**
     * <p>The ID sent with the latest
     * CAMERA2_TRIGGER_PRECAPTURE_METERING call</p>
     * <p>Must be 0 if no
     * CAMERA2_TRIGGER_PRECAPTURE_METERING trigger received yet
     * by HAL. Always updated even if AE algorithm ignores the
     * trigger</p>
     * @hide
     */
    public static final Key<Integer> CONTROL_AE_PRECAPTURE_ID =
            new Key<Integer>("android.control.aePrecaptureId", int.class);

    /**
     * <p>The desired mode for the camera device's
     * auto-exposure routine.</p>
     * <p>This control is only effective if {@link CaptureRequest#CONTROL_MODE android.control.mode} is
     * AUTO.</p>
     * <p>When set to any of the ON modes, the camera device's
     * auto-exposure routine is enabled, overriding the
     * application's selected exposure time, sensor sensitivity,
     * and frame duration ({@link CaptureRequest#SENSOR_EXPOSURE_TIME android.sensor.exposureTime},
     * {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}, and
     * {@link CaptureRequest#SENSOR_FRAME_DURATION android.sensor.frameDuration}). If one of the FLASH modes
     * is selected, the camera device's flash unit controls are
     * also overridden.</p>
     * <p>The FLASH modes are only available if the camera device
     * has a flash unit ({@link CameraCharacteristics#FLASH_INFO_AVAILABLE android.flash.info.available} is <code>true</code>).</p>
     * <p>If flash TORCH mode is desired, this field must be set to
     * ON or OFF, and {@link CaptureRequest#FLASH_MODE android.flash.mode} set to TORCH.</p>
     * <p>When set to any of the ON modes, the values chosen by the
     * camera device auto-exposure routine for the overridden
     * fields for a given capture will be available in its
     * CaptureResult.</p>
     *
     * @see CaptureRequest#CONTROL_MODE
     * @see CameraCharacteristics#FLASH_INFO_AVAILABLE
     * @see CaptureRequest#FLASH_MODE
     * @see CaptureRequest#SENSOR_EXPOSURE_TIME
     * @see CaptureRequest#SENSOR_FRAME_DURATION
     * @see CaptureRequest#SENSOR_SENSITIVITY
     * @see #CONTROL_AE_MODE_OFF
     * @see #CONTROL_AE_MODE_ON
     * @see #CONTROL_AE_MODE_ON_AUTO_FLASH
     * @see #CONTROL_AE_MODE_ON_ALWAYS_FLASH
     * @see #CONTROL_AE_MODE_ON_AUTO_FLASH_REDEYE
     */
    public static final Key<Integer> CONTROL_AE_MODE =
            new Key<Integer>("android.control.aeMode", int.class);

    /**
     * <p>List of areas to use for
     * metering</p>
     * <p>Each area is a rectangle plus weight: xmin, ymin,
     * xmax, ymax, weight. The rectangle is defined inclusive of the
     * specified coordinates.</p>
     * <p>The coordinate system is based on the active pixel array,
     * with (0,0) being the top-left pixel in the active pixel array, and
     * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
     * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the
     * bottom-right pixel in the active pixel array. The weight
     * should be nonnegative.</p>
     * <p>If all regions have 0 weight, then no specific metering area
     * needs to be used by the HAL. If the metering region is
     * outside the current {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion}, the HAL
     * should ignore the sections outside the region and output the
     * used sections in the frame metadata</p>
     *
     * @see CaptureRequest#SCALER_CROP_REGION
     * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
     */
    public static final Key<int[]> CONTROL_AE_REGIONS =
            new Key<int[]>("android.control.aeRegions", int[].class);

    /**
     * <p>Current state of AE algorithm</p>
     * <p>Switching between or enabling AE modes ({@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode}) always
     * resets the AE state to INACTIVE. Similarly, switching between {@link CaptureRequest#CONTROL_MODE android.control.mode},
     * or {@link CaptureRequest#CONTROL_SCENE_MODE android.control.sceneMode} if <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code> resets all
     * the algorithm states to INACTIVE.</p>
     * <p>The camera device can do several state transitions between two results, if it is
     * allowed by the state transition table. For example: INACTIVE may never actually be
     * seen in a result.</p>
     * <p>The state in the result is the state for this image (in sync with this image): if
     * AE state becomes CONVERGED, then the image data associated with this result should
     * be good to use.</p>
     * <p>Below are state transition tables for different AE modes.</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center"></td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Camera device auto exposure algorithm is disabled</td>
     * </tr>
     * </tbody>
     * </table>
     * <p>When {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is AE_MODE_ON_*:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">Camera device initiates AE scan</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values changing</td>
     * </tr>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">SEARCHING</td>
     * <td align="center">Camera device finishes AE scan</td>
     * <td align="center">CONVERGED</td>
     * <td align="center">Good values, not changing</td>
     * </tr>
     * <tr>
     * <td align="center">SEARCHING</td>
     * <td align="center">Camera device finishes AE scan</td>
     * <td align="center">FLASH_REQUIRED</td>
     * <td align="center">Converged but too dark w/o flash</td>
     * </tr>
     * <tr>
     * <td align="center">SEARCHING</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">CONVERGED</td>
     * <td align="center">Camera device initiates AE scan</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values changing</td>
     * </tr>
     * <tr>
     * <td align="center">CONVERGED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">FLASH_REQUIRED</td>
     * <td align="center">Camera device initiates AE scan</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values changing</td>
     * </tr>
     * <tr>
     * <td align="center">FLASH_REQUIRED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">LOCKED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values not good after unlock</td>
     * </tr>
     * <tr>
     * <td align="center">LOCKED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
     * <td align="center">CONVERGED</td>
     * <td align="center">Values good after unlock</td>
     * </tr>
     * <tr>
     * <td align="center">LOCKED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
     * <td align="center">FLASH_REQUIRED</td>
     * <td align="center">Exposure good, but too dark</td>
     * </tr>
     * <tr>
     * <td align="center">PRECAPTURE</td>
     * <td align="center">Sequence done. {@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is OFF</td>
     * <td align="center">CONVERGED</td>
     * <td align="center">Ready for high-quality capture</td>
     * </tr>
     * <tr>
     * <td align="center">PRECAPTURE</td>
     * <td align="center">Sequence done. {@link CaptureRequest#CONTROL_AE_LOCK android.control.aeLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Ready for high-quality capture</td>
     * </tr>
     * <tr>
     * <td align="center">Any state</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger} is START</td>
     * <td align="center">PRECAPTURE</td>
     * <td align="center">Start AE precapture metering sequence</td>
     * </tr>
     * </tbody>
     * </table>
     *
     * @see CaptureRequest#CONTROL_AE_LOCK
     * @see CaptureRequest#CONTROL_AE_MODE
     * @see CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER
     * @see CaptureRequest#CONTROL_MODE
     * @see CaptureRequest#CONTROL_SCENE_MODE
     * @see #CONTROL_AE_STATE_INACTIVE
     * @see #CONTROL_AE_STATE_SEARCHING
     * @see #CONTROL_AE_STATE_CONVERGED
     * @see #CONTROL_AE_STATE_LOCKED
     * @see #CONTROL_AE_STATE_FLASH_REQUIRED
     * @see #CONTROL_AE_STATE_PRECAPTURE
     */
    public static final Key<Integer> CONTROL_AE_STATE =
            new Key<Integer>("android.control.aeState", int.class);

    /**
     * <p>Whether AF is currently enabled, and what
     * mode it is set to</p>
     * <p>Only effective if {@link CaptureRequest#CONTROL_MODE android.control.mode} = AUTO.</p>
     * <p>If the lens is controlled by the camera device auto-focus algorithm,
     * the camera device will report the current AF status in android.control.afState
     * in result metadata.</p>
     *
     * @see CaptureRequest#CONTROL_MODE
     * @see #CONTROL_AF_MODE_OFF
     * @see #CONTROL_AF_MODE_AUTO
     * @see #CONTROL_AF_MODE_MACRO
     * @see #CONTROL_AF_MODE_CONTINUOUS_VIDEO
     * @see #CONTROL_AF_MODE_CONTINUOUS_PICTURE
     * @see #CONTROL_AF_MODE_EDOF
     */
    public static final Key<Integer> CONTROL_AF_MODE =
            new Key<Integer>("android.control.afMode", int.class);

    /**
     * <p>List of areas to use for focus
     * estimation</p>
     * <p>Each area is a rectangle plus weight: xmin, ymin,
     * xmax, ymax, weight. The rectangle is defined inclusive of the
     * specified coordinates.</p>
     * <p>The coordinate system is based on the active pixel array,
     * with (0,0) being the top-left pixel in the active pixel array, and
     * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
     * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the
     * bottom-right pixel in the active pixel array. The weight
     * should be nonnegative.</p>
     * <p>If all regions have 0 weight, then no specific focus area
     * needs to be used by the HAL. If the focusing region is
     * outside the current {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion}, the HAL
     * should ignore the sections outside the region and output the
     * used sections in the frame metadata</p>
     *
     * @see CaptureRequest#SCALER_CROP_REGION
     * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
     */
    public static final Key<int[]> CONTROL_AF_REGIONS =
            new Key<int[]>("android.control.afRegions", int[].class);

    /**
     * <p>Current state of AF algorithm</p>
     * <p>Switching between or enabling AF modes ({@link CaptureRequest#CONTROL_AF_MODE android.control.afMode}) always
     * resets the AF state to INACTIVE. Similarly, switching between {@link CaptureRequest#CONTROL_MODE android.control.mode},
     * or {@link CaptureRequest#CONTROL_SCENE_MODE android.control.sceneMode} if <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code> resets all
     * the algorithm states to INACTIVE.</p>
     * <p>The camera device can do several state transitions between two results, if it is
     * allowed by the state transition table. For example: INACTIVE may never actually be
     * seen in a result.</p>
     * <p>The state in the result is the state for this image (in sync with this image): if
     * AF state becomes FOCUSED, then the image data associated with this result should
     * be sharp.</p>
     * <p>Below are state transition tables for different AF modes.</p>
     * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_OFF or AF_MODE_EDOF:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center"></td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Never changes</td>
     * </tr>
     * </tbody>
     * </table>
     * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_AUTO or AF_MODE_MACRO:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">ACTIVE_SCAN</td>
     * <td align="center">Start AF sweep, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">ACTIVE_SCAN</td>
     * <td align="center">AF sweep done</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">Focused, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">ACTIVE_SCAN</td>
     * <td align="center">AF sweep done</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">Not focused, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">ACTIVE_SCAN</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Cancel/reset AF, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Cancel/reset AF</td>
     * </tr>
     * <tr>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">ACTIVE_SCAN</td>
     * <td align="center">Start new sweep, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Cancel/reset AF</td>
     * </tr>
     * <tr>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">ACTIVE_SCAN</td>
     * <td align="center">Start new sweep, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">Any state</td>
     * <td align="center">Mode change</td>
     * <td align="center">INACTIVE</td>
     * <td align="center"></td>
     * </tr>
     * </tbody>
     * </table>
     * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_CONTINUOUS_VIDEO:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">Camera device initiates new scan</td>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Start AF scan, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF state query, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Camera device completes current scan</td>
     * <td align="center">PASSIVE_FOCUSED</td>
     * <td align="center">End AF scan, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Camera device fails current scan</td>
     * <td align="center">PASSIVE_UNFOCUSED</td>
     * <td align="center">End AF scan, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">Immediate trans. If focus is good, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">Immediate trans. if focus is bad, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Reset lens position, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_FOCUSED</td>
     * <td align="center">Camera device initiates new scan</td>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Start AF scan, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_UNFOCUSED</td>
     * <td align="center">Camera device initiates new scan</td>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Start AF scan, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_FOCUSED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">Immediate trans. Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_UNFOCUSED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">Immediate trans. Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">No effect</td>
     * </tr>
     * <tr>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Restart AF scan</td>
     * </tr>
     * <tr>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">No effect</td>
     * </tr>
     * <tr>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Restart AF scan</td>
     * </tr>
     * </tbody>
     * </table>
     * <p>When {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode} is AF_MODE_CONTINUOUS_PICTURE:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">Camera device initiates new scan</td>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Start AF scan, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF state query, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Camera device completes current scan</td>
     * <td align="center">PASSIVE_FOCUSED</td>
     * <td align="center">End AF scan, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Camera device fails current scan</td>
     * <td align="center">PASSIVE_UNFOCUSED</td>
     * <td align="center">End AF scan, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">Eventual trans. once focus good, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">Eventual trans. if cannot focus, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Reset lens position, Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_FOCUSED</td>
     * <td align="center">Camera device initiates new scan</td>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Start AF scan, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_UNFOCUSED</td>
     * <td align="center">Camera device initiates new scan</td>
     * <td align="center">PASSIVE_SCAN</td>
     * <td align="center">Start AF scan, Lens now moving</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_FOCUSED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">Immediate trans. Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">PASSIVE_UNFOCUSED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">Immediate trans. Lens now locked</td>
     * </tr>
     * <tr>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">No effect</td>
     * </tr>
     * <tr>
     * <td align="center">FOCUSED_LOCKED</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Restart AF scan</td>
     * </tr>
     * <tr>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF_TRIGGER</td>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">No effect</td>
     * </tr>
     * <tr>
     * <td align="center">NOT_FOCUSED_LOCKED</td>
     * <td align="center">AF_CANCEL</td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Restart AF scan</td>
     * </tr>
     * </tbody>
     * </table>
     *
     * @see CaptureRequest#CONTROL_AF_MODE
     * @see CaptureRequest#CONTROL_MODE
     * @see CaptureRequest#CONTROL_SCENE_MODE
     * @see #CONTROL_AF_STATE_INACTIVE
     * @see #CONTROL_AF_STATE_PASSIVE_SCAN
     * @see #CONTROL_AF_STATE_PASSIVE_FOCUSED
     * @see #CONTROL_AF_STATE_ACTIVE_SCAN
     * @see #CONTROL_AF_STATE_FOCUSED_LOCKED
     * @see #CONTROL_AF_STATE_NOT_FOCUSED_LOCKED
     * @see #CONTROL_AF_STATE_PASSIVE_UNFOCUSED
     */
    public static final Key<Integer> CONTROL_AF_STATE =
            new Key<Integer>("android.control.afState", int.class);

    /**
     * <p>The ID sent with the latest
     * CAMERA2_TRIGGER_AUTOFOCUS call</p>
     * <p>Must be 0 if no CAMERA2_TRIGGER_AUTOFOCUS trigger
     * received yet by HAL. Always updated even if AF algorithm
     * ignores the trigger</p>
     * @hide
     */
    public static final Key<Integer> CONTROL_AF_TRIGGER_ID =
            new Key<Integer>("android.control.afTriggerId", int.class);

    /**
     * <p>Whether AWB is currently setting the color
     * transform fields, and what its illumination target
     * is</p>
     * <p>This control is only effective if {@link CaptureRequest#CONTROL_MODE android.control.mode} is AUTO.</p>
     * <p>When set to the ON mode, the camera device's auto white balance
     * routine is enabled, overriding the application's selected
     * {@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform}, {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} and
     * {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode}.</p>
     * <p>When set to the OFF mode, the camera device's auto white balance
     * routine is disabled. The applicantion manually controls the white
     * balance by {@link CaptureRequest#COLOR_CORRECTION_TRANSFORM android.colorCorrection.transform}, android.colorCorrection.gains
     * and {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode}.</p>
     * <p>When set to any other modes, the camera device's auto white balance
     * routine is disabled. The camera device uses each particular illumination
     * target for white balance adjustment.</p>
     *
     * @see CaptureRequest#COLOR_CORRECTION_GAINS
     * @see CaptureRequest#COLOR_CORRECTION_MODE
     * @see CaptureRequest#COLOR_CORRECTION_TRANSFORM
     * @see CaptureRequest#CONTROL_MODE
     * @see #CONTROL_AWB_MODE_OFF
     * @see #CONTROL_AWB_MODE_AUTO
     * @see #CONTROL_AWB_MODE_INCANDESCENT
     * @see #CONTROL_AWB_MODE_FLUORESCENT
     * @see #CONTROL_AWB_MODE_WARM_FLUORESCENT
     * @see #CONTROL_AWB_MODE_DAYLIGHT
     * @see #CONTROL_AWB_MODE_CLOUDY_DAYLIGHT
     * @see #CONTROL_AWB_MODE_TWILIGHT
     * @see #CONTROL_AWB_MODE_SHADE
     */
    public static final Key<Integer> CONTROL_AWB_MODE =
            new Key<Integer>("android.control.awbMode", int.class);

    /**
     * <p>List of areas to use for illuminant
     * estimation</p>
     * <p>Only used in AUTO mode.</p>
     * <p>Each area is a rectangle plus weight: xmin, ymin,
     * xmax, ymax, weight. The rectangle is defined inclusive of the
     * specified coordinates.</p>
     * <p>The coordinate system is based on the active pixel array,
     * with (0,0) being the top-left pixel in the active pixel array, and
     * ({@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.width - 1,
     * {@link CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE android.sensor.info.activeArraySize}.height - 1) being the
     * bottom-right pixel in the active pixel array. The weight
     * should be nonnegative.</p>
     * <p>If all regions have 0 weight, then no specific metering area
     * needs to be used by the HAL. If the metering region is
     * outside the current {@link CaptureRequest#SCALER_CROP_REGION android.scaler.cropRegion}, the HAL
     * should ignore the sections outside the region and output the
     * used sections in the frame metadata</p>
     *
     * @see CaptureRequest#SCALER_CROP_REGION
     * @see CameraCharacteristics#SENSOR_INFO_ACTIVE_ARRAY_SIZE
     */
    public static final Key<int[]> CONTROL_AWB_REGIONS =
            new Key<int[]>("android.control.awbRegions", int[].class);

    /**
     * <p>Current state of AWB algorithm</p>
     * <p>Switching between or enabling AWB modes ({@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode}) always
     * resets the AWB state to INACTIVE. Similarly, switching between {@link CaptureRequest#CONTROL_MODE android.control.mode},
     * or {@link CaptureRequest#CONTROL_SCENE_MODE android.control.sceneMode} if <code>{@link CaptureRequest#CONTROL_MODE android.control.mode} == USE_SCENE_MODE</code> resets all
     * the algorithm states to INACTIVE.</p>
     * <p>The camera device can do several state transitions between two results, if it is
     * allowed by the state transition table. So INACTIVE may never actually be seen in
     * a result.</p>
     * <p>The state in the result is the state for this image (in sync with this image): if
     * AWB state becomes CONVERGED, then the image data associated with this result should
     * be good to use.</p>
     * <p>Below are state transition tables for different AWB modes.</p>
     * <p>When <code>{@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode} != AWB_MODE_AUTO</code>:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center"></td>
     * <td align="center">INACTIVE</td>
     * <td align="center">Camera device auto white balance algorithm is disabled</td>
     * </tr>
     * </tbody>
     * </table>
     * <p>When {@link CaptureRequest#CONTROL_AWB_MODE android.control.awbMode} is AWB_MODE_AUTO:</p>
     * <table>
     * <thead>
     * <tr>
     * <th align="center">State</th>
     * <th align="center">Transition Cause</th>
     * <th align="center">New State</th>
     * <th align="center">Notes</th>
     * </tr>
     * </thead>
     * <tbody>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">Camera device initiates AWB scan</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values changing</td>
     * </tr>
     * <tr>
     * <td align="center">INACTIVE</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">SEARCHING</td>
     * <td align="center">Camera device finishes AWB scan</td>
     * <td align="center">CONVERGED</td>
     * <td align="center">Good values, not changing</td>
     * </tr>
     * <tr>
     * <td align="center">SEARCHING</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">CONVERGED</td>
     * <td align="center">Camera device initiates AWB scan</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values changing</td>
     * </tr>
     * <tr>
     * <td align="center">CONVERGED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is ON</td>
     * <td align="center">LOCKED</td>
     * <td align="center">Values locked</td>
     * </tr>
     * <tr>
     * <td align="center">LOCKED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is OFF</td>
     * <td align="center">SEARCHING</td>
     * <td align="center">Values not good after unlock</td>
     * </tr>
     * <tr>
     * <td align="center">LOCKED</td>
     * <td align="center">{@link CaptureRequest#CONTROL_AWB_LOCK android.control.awbLock} is OFF</td>
     * <td align="center">CONVERGED</td>
     * <td align="center">Values good after unlock</td>
     * </tr>
     * </tbody>
     * </table>
     *
     * @see CaptureRequest#CONTROL_AWB_LOCK
     * @see CaptureRequest#CONTROL_AWB_MODE
     * @see CaptureRequest#CONTROL_MODE
     * @see CaptureRequest#CONTROL_SCENE_MODE
     * @see #CONTROL_AWB_STATE_INACTIVE
     * @see #CONTROL_AWB_STATE_SEARCHING
     * @see #CONTROL_AWB_STATE_CONVERGED
     * @see #CONTROL_AWB_STATE_LOCKED
     */
    public static final Key<Integer> CONTROL_AWB_STATE =
            new Key<Integer>("android.control.awbState", int.class);

    /**
     * <p>Overall mode of 3A control
     * routines</p>
     * <p>High-level 3A control. When set to OFF, all 3A control
     * by the camera device is disabled. The application must set the fields for
     * capture parameters itself.</p>
     * <p>When set to AUTO, the individual algorithm controls in
     * android.control.* are in effect, such as {@link CaptureRequest#CONTROL_AF_MODE android.control.afMode}.</p>
     * <p>When set to USE_SCENE_MODE, the individual controls in
     * android.control.* are mostly disabled, and the camera device implements
     * one of the scene mode settings (such as ACTION, SUNSET, or PARTY)
     * as it wishes. The camera device scene mode 3A settings are provided by
     * android.control.sceneModeOverrides.</p>
     *
     * @see CaptureRequest#CONTROL_AF_MODE
     * @see #CONTROL_MODE_OFF
     * @see #CONTROL_MODE_AUTO
     * @see #CONTROL_MODE_USE_SCENE_MODE
     */
    public static final Key<Integer> CONTROL_MODE =
            new Key<Integer>("android.control.mode", int.class);

    /**
     * <p>Operation mode for edge
     * enhancement</p>
     * <p>Edge/sharpness/detail enhancement. OFF means no
     * enhancement will be applied by the HAL.</p>
     * <p>FAST/HIGH_QUALITY both mean camera device determined enhancement
     * will be applied. HIGH_QUALITY mode indicates that the
     * camera device will use the highest-quality enhancement algorithms,
     * even if it slows down capture rate. FAST means the camera device will
     * not slow down capture rate when applying edge enhancement.</p>
     * @see #EDGE_MODE_OFF
     * @see #EDGE_MODE_FAST
     * @see #EDGE_MODE_HIGH_QUALITY
     */
    public static final Key<Integer> EDGE_MODE =
            new Key<Integer>("android.edge.mode", int.class);

    /**
     * <p>The desired mode for for the camera device's flash control.</p>
     * <p>This control is only effective when flash unit is available
     * (<code>{@link CameraCharacteristics#FLASH_INFO_AVAILABLE android.flash.info.available} != 0</code>).</p>
     * <p>When this control is used, the {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} must be set to ON or OFF.
     * Otherwise, the camera device auto-exposure related flash control (ON_AUTO_FLASH,
     * ON_ALWAYS_FLASH, or ON_AUTO_FLASH_REDEYE) will override this control.</p>
     * <p>When set to OFF, the camera device will not fire flash for this capture.</p>
     * <p>When set to SINGLE, the camera device will fire flash regardless of the camera
     * device's auto-exposure routine's result. When used in still capture case, this
     * control should be used along with AE precapture metering sequence
     * ({@link CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER android.control.aePrecaptureTrigger}), otherwise, the image may be incorrectly exposed.</p>
     * <p>When set to TORCH, the flash will be on continuously. This mode can be used
     * for use cases such as preview, auto-focus assist, still capture, or video recording.</p>
     *
     * @see CaptureRequest#CONTROL_AE_MODE
     * @see CaptureRequest#CONTROL_AE_PRECAPTURE_TRIGGER
     * @see CameraCharacteristics#FLASH_INFO_AVAILABLE
     * @see #FLASH_MODE_OFF
     * @see #FLASH_MODE_SINGLE
     * @see #FLASH_MODE_TORCH
     */
    public static final Key<Integer> FLASH_MODE =
            new Key<Integer>("android.flash.mode", int.class);

    /**
     * <p>Current state of the flash
     * unit</p>
     * @see #FLASH_STATE_UNAVAILABLE
     * @see #FLASH_STATE_CHARGING
     * @see #FLASH_STATE_READY
     * @see #FLASH_STATE_FIRED
     */
    public static final Key<Integer> FLASH_STATE =
            new Key<Integer>("android.flash.state", int.class);

    /**
     * <p>GPS coordinates to include in output JPEG
     * EXIF</p>
     */
    public static final Key<double[]> JPEG_GPS_COORDINATES =
            new Key<double[]>("android.jpeg.gpsCoordinates", double[].class);

    /**
     * <p>32 characters describing GPS algorithm to
     * include in EXIF</p>
     */
    public static final Key<String> JPEG_GPS_PROCESSING_METHOD =
            new Key<String>("android.jpeg.gpsProcessingMethod", String.class);

    /**
     * <p>Time GPS fix was made to include in
     * EXIF</p>
     */
    public static final Key<Long> JPEG_GPS_TIMESTAMP =
            new Key<Long>("android.jpeg.gpsTimestamp", long.class);

    /**
     * <p>Orientation of JPEG image to
     * write</p>
     */
    public static final Key<Integer> JPEG_ORIENTATION =
            new Key<Integer>("android.jpeg.orientation", int.class);

    /**
     * <p>Compression quality of the final JPEG
     * image</p>
     * <p>85-95 is typical usage range</p>
     */
    public static final Key<Byte> JPEG_QUALITY =
            new Key<Byte>("android.jpeg.quality", byte.class);

    /**
     * <p>Compression quality of JPEG
     * thumbnail</p>
     */
    public static final Key<Byte> JPEG_THUMBNAIL_QUALITY =
            new Key<Byte>("android.jpeg.thumbnailQuality", byte.class);

    /**
     * <p>Resolution of embedded JPEG thumbnail</p>
     * <p>When set to (0, 0) value, the JPEG EXIF will not contain thumbnail,
     * but the captured JPEG will still be a valid image.</p>
     * <p>When a jpeg image capture is issued, the thumbnail size selected should have
     * the same aspect ratio as the jpeg image.</p>
     */
    public static final Key<android.hardware.camera2.Size> JPEG_THUMBNAIL_SIZE =
            new Key<android.hardware.camera2.Size>("android.jpeg.thumbnailSize", android.hardware.camera2.Size.class);

    /**
     * <p>The ratio of lens focal length to the effective
     * aperture diameter.</p>
     * <p>This will only be supported on the camera devices that
     * have variable aperture lens. The aperture value can only be
     * one of the values listed in {@link CameraCharacteristics#LENS_INFO_AVAILABLE_APERTURES android.lens.info.availableApertures}.</p>
     * <p>When this is supported and {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is OFF,
     * this can be set along with {@link CaptureRequest#SENSOR_EXPOSURE_TIME android.sensor.exposureTime},
     * {@link CaptureRequest#SENSOR_SENSITIVITY android.sensor.sensitivity}, and android.sensor.frameDuration
     * to achieve manual exposure control.</p>
     * <p>The requested aperture value may take several frames to reach the
     * requested value; the camera device will report the current (intermediate)
     * aperture size in capture result metadata while the aperture is changing.</p>
     * <p>When this is supported and {@link CaptureRequest#CONTROL_AE_MODE android.control.aeMode} is one of
     * the ON modes, this will be overridden by the camera device
     * auto-exposure algorithm, the overridden values are then provided
     * back to the user in the corresponding result.</p>
     *
     * @see CaptureRequest#CONTROL_AE_MODE
     * @see CameraCharacteristics#LENS_INFO_AVAILABLE_APERTURES
     * @see CaptureRequest#SENSOR_EXPOSURE_TIME
     * @see CaptureRequest#SENSOR_SENSITIVITY
     */
    public static final Key<Float> LENS_APERTURE =
            new Key<Float>("android.lens.aperture", float.class);

    /**
     * <p>State of lens neutral density filter(s).</p>
     * <p>This will not be supported on most camera devices. On devices
     * where this is supported, this may only be set to one of the
     * values included in {@link CameraCharacteristics#LENS_INFO_AVAILABLE_FILTER_DENSITIES android.lens.info.availableFilterDensities}.</p>
     * <p>Lens filters are typically used to lower the amount of light the
     * sensor is exposed to (measured in steps of EV). As used here, an EV
     * step is the standard logarithmic representation, which are
     * non-negative, and inversely proportional to the amount of light
     * hitting the sensor.  For example, setting this to 0 would result
     * in no reduction of the incoming light, and setting this to 2 would
     * mean that the filter is set to reduce incoming light by two stops
     * (allowing 1/4 of the prior amount of light to the sensor).</p>
     *
     * @see CameraCharacteristics#LENS_INFO_AVAILABLE_FILTER_DENSITIES
     */
    public static final Key<Float> LENS_FILTER_DENSITY =
            new Key<Float>("android.lens.filterDensity", float.class);

    /**
     * <p>Lens optical zoom setting</p>
     * <p>Will not be supported on most devices.</p>
     */
    public static final Key<Float> LENS_FOCAL_LENGTH =
            new Key<Float>("android.lens.focalLength", float.class);

    /**
     * <p>Distance to plane of sharpest focus,
     * measured from frontmost surface of the lens</p>
     * <p>Should be zero for fixed-focus cameras</p>
     */
    public static final Key<Float> LENS_FOCUS_DISTANCE =
            new Key<Float>("android.lens.focusDistance", float.class);

    /**
     * <p>The range of scene distances that are in
     * sharp focus (depth of field)</p>
     * <p>If variable focus not supported, can still report
     * fixed depth of field range</p>
     */
    public static final Key<float[]> LENS_FOCUS_RANGE =
            new Key<float[]>("android.lens.focusRange", float[].class);

    /**
     * <p>Whether optical image stabilization is
     * enabled.</p>
     * <p>Will not be supported on most devices.</p>
     * @see #LENS_OPTICAL_STABILIZATION_MODE_OFF
     * @see #LENS_OPTICAL_STABILIZATION_MODE_ON
     */
    public static final Key<Integer> LENS_OPTICAL_STABILIZATION_MODE =
            new Key<Integer>("android.lens.opticalStabilizationMode", int.class);

    /**
     * <p>Current lens status</p>
     * @see #LENS_STATE_STATIONARY
     * @see #LENS_STATE_MOVING
     */
    public static final Key<Integer> LENS_STATE =
            new Key<Integer>("android.lens.state", int.class);

    /**
     * <p>Mode of operation for the noise reduction
     * algorithm</p>
     * <p>Noise filtering control. OFF means no noise reduction
     * will be applied by the HAL.</p>
     * <p>FAST/HIGH_QUALITY both mean camera device determined noise filtering
     * will be applied. HIGH_QUALITY mode indicates that the camera device
     * will use the highest-quality noise filtering algorithms,
     * even if it slows down capture rate. FAST means the camera device should not
     * slow down capture rate when applying noise filtering.</p>
     * @see #NOISE_REDUCTION_MODE_OFF
     * @see #NOISE_REDUCTION_MODE_FAST
     * @see #NOISE_REDUCTION_MODE_HIGH_QUALITY
     */
    public static final Key<Integer> NOISE_REDUCTION_MODE =
            new Key<Integer>("android.noiseReduction.mode", int.class);

    /**
     * <p>Whether a result given to the framework is the
     * final one for the capture, or only a partial that contains a
     * subset of the full set of dynamic metadata
     * values.</p>
     * <p>The entries in the result metadata buffers for a
     * single capture may not overlap, except for this entry. The
     * FINAL buffers must retain FIFO ordering relative to the
     * requests that generate them, so the FINAL buffer for frame 3 must
     * always be sent to the framework after the FINAL buffer for frame 2, and
     * before the FINAL buffer for frame 4. PARTIAL buffers may be returned
     * in any order relative to other frames, but all PARTIAL buffers for a given
     * capture must arrive before the FINAL buffer for that capture. This entry may
     * only be used by the HAL if quirks.usePartialResult is set to 1.</p>
     * <p><b>Optional</b> - This value may be {@code null} on some devices.</p>
     * @hide
     */
    public static final Key<Boolean> QUIRKS_PARTIAL_RESULT =
            new Key<Boolean>("android.quirks.partialResult", boolean.class);

    /**
     * <p>A frame counter set by the framework. This value monotonically
     * increases with every new result (that is, each new result has a unique
     * frameCount value).</p>
     * <p>Reset on release()</p>
     */
    public static final Key<Integer> REQUEST_FRAME_COUNT =
            new Key<Integer>("android.request.frameCount", int.class);

    /**
     * <p>An application-specified ID for the current
     * request. Must be maintained unchanged in output
     * frame</p>
     * @hide
     */
    public static final Key<Integer> REQUEST_ID =
            new Key<Integer>("android.request.id", int.class);

    /**
     * <p>(x, y, width, height).</p>
     * <p>A rectangle with the top-level corner of (x,y) and size
     * (width, height). The region of the sensor that is used for
     * output. Each stream must use this rectangle to produce its
     * output, cropping to a smaller region if necessary to
     * maintain the stream's aspect ratio.</p>
     * <p>HAL2.x uses only (x, y, width)</p>
     * <p>Any additional per-stream cropping must be done to
     * maximize the final pixel area of the stream.</p>
     * <p>For example, if the crop region is set to a 4:3 aspect
     * ratio, then 4:3 streams should use the exact crop
     * region. 16:9 streams should further crop vertically
     * (letterbox).</p>
     * <p>Conversely, if the crop region is set to a 16:9, then 4:3
     * outputs should crop horizontally (pillarbox), and 16:9
     * streams should match exactly. These additional crops must
     * be centered within the crop region.</p>
     * <p>The output streams must maintain square pixels at all
     * times, no matter what the relative aspect ratios of the
     * crop region and the stream are.  Negative values for
     * corner are allowed for raw output if full pixel array is
     * larger than active pixel array. Width and height may be
     * rounded to nearest larger supportable width, especially
     * for raw output, where only a few fixed scales may be
     * possible. The width and height of the crop region cannot
     * be set to be smaller than floor( activeArraySize.width /
     * android.scaler.maxDigitalZoom ) and floor(
     * activeArraySize.height / android.scaler.maxDigitalZoom),
     * respectively.</p>
     */
    public static final Key<android.graphics.Rect> SCALER_CROP_REGION =
            new Key<android.graphics.Rect>("android.scaler.cropRegion", android.graphics.Rect.class);

    /**
     * <p>Duration each pixel is exposed to
     * light.</p>
     * <p>If the sensor can't expose this exact duration, it should shorten the
     * duration exposed to the nearest possible value (rather than expose longer).</p>
     * <p>1/10000 - 30 sec range. No bulb mode</p>
     */
    public static final Key<Long> SENSOR_EXPOSURE_TIME =
            new Key<Long>("android.sensor.exposureTime", long.class);

    /**
     * <p>Duration from start of frame exposure to
     * start of next frame exposure</p>
     * <p>Exposure time has priority, so duration is set to
     * max(duration, exposure time + overhead)</p>
     */
    public static final Key<Long> SENSOR_FRAME_DURATION =
            new Key<Long>("android.sensor.frameDuration", long.class);

    /**
     * <p>Gain applied to image data. Must be
     * implemented through analog gain only if set to values
     * below 'maximum analog sensitivity'.</p>
     * <p>If the sensor can't apply this exact gain, it should lessen the
     * gain to the nearest possible value (rather than gain more).</p>
     * <p>ISO 12232:2006 REI method</p>
     */
    public static final Key<Integer> SENSOR_SENSITIVITY =
            new Key<Integer>("android.sensor.sensitivity", int.class);

    /**
     * <p>Time at start of exposure of first
     * row</p>
     * <p>Monotonic, should be synced to other timestamps in
     * system</p>
     */
    public static final Key<Long> SENSOR_TIMESTAMP =
            new Key<Long>("android.sensor.timestamp", long.class);

    /**
     * <p>The temperature of the sensor, sampled at the time
     * exposure began for this frame.</p>
     * <p>The thermal diode being queried should be inside the sensor PCB, or
     * somewhere close to it.</p>
     * <p><b>Optional</b> - This value may be {@code null} on some devices.</p>
     * <p><b>Full capability</b> -
     * Present on all camera devices that report being {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL_FULL HARDWARE_LEVEL_FULL} devices in the
     * {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL android.info.supportedHardwareLevel} key</p>
     *
     * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
     */
    public static final Key<Float> SENSOR_TEMPERATURE =
            new Key<Float>("android.sensor.temperature", float.class);

    /**
     * <p>State of the face detector
     * unit</p>
     * <p>Whether face detection is enabled, and whether it
     * should output just the basic fields or the full set of
     * fields. Value must be one of the
     * {@link CameraCharacteristics#STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES android.statistics.info.availableFaceDetectModes}.</p>
     *
     * @see CameraCharacteristics#STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES
     * @see #STATISTICS_FACE_DETECT_MODE_OFF
     * @see #STATISTICS_FACE_DETECT_MODE_SIMPLE
     * @see #STATISTICS_FACE_DETECT_MODE_FULL
     */
    public static final Key<Integer> STATISTICS_FACE_DETECT_MODE =
            new Key<Integer>("android.statistics.faceDetectMode", int.class);

    /**
     * <p>List of unique IDs for detected
     * faces</p>
     * <p>Only available if faceDetectMode == FULL</p>
     * @hide
     */
    public static final Key<int[]> STATISTICS_FACE_IDS =
            new Key<int[]>("android.statistics.faceIds", int[].class);

    /**
     * <p>List of landmarks for detected
     * faces</p>
     * <p>Only available if faceDetectMode == FULL</p>
     * @hide
     */
    public static final Key<int[]> STATISTICS_FACE_LANDMARKS =
            new Key<int[]>("android.statistics.faceLandmarks", int[].class);

    /**
     * <p>List of the bounding rectangles for detected
     * faces</p>
     * <p>Only available if faceDetectMode != OFF</p>
     * @hide
     */
    public static final Key<android.graphics.Rect[]> STATISTICS_FACE_RECTANGLES =
            new Key<android.graphics.Rect[]>("android.statistics.faceRectangles", android.graphics.Rect[].class);

    /**
     * <p>List of the face confidence scores for
     * detected faces</p>
     * <p>Only available if faceDetectMode != OFF. The value should be
     * meaningful (for example, setting 100 at all times is illegal).</p>
     * @hide
     */
    public static final Key<byte[]> STATISTICS_FACE_SCORES =
            new Key<byte[]>("android.statistics.faceScores", byte[].class);

    /**
     * <p>The shading map is a low-resolution floating-point map
     * that lists the coefficients used to correct for vignetting, for each
     * Bayer color channel.</p>
     * <p>The least shaded section of the image should have a gain factor
     * of 1; all other sections should have gains above 1.</p>
     * <p>When {@link CaptureRequest#COLOR_CORRECTION_MODE android.colorCorrection.mode} = TRANSFORM_MATRIX, the map
     * must take into account the colorCorrection settings.</p>
     * <p>The shading map is for the entire active pixel array, and is not
     * affected by the crop region specified in the request. Each shading map
     * entry is the value of the shading compensation map over a specific
     * pixel on the sensor.  Specifically, with a (N x M) resolution shading
     * map, and an active pixel array size (W x H), shading map entry
     * (x,y) ϵ (0 ... N-1, 0 ... M-1) is the value of the shading map at
     * pixel ( ((W-1)/(N-1)) * x, ((H-1)/(M-1)) * y) for the four color channels.
     * The map is assumed to be bilinearly interpolated between the sample points.</p>
     * <p>The channel order is [R, Geven, Godd, B], where Geven is the green
     * channel for the even rows of a Bayer pattern, and Godd is the odd rows.
     * The shading map is stored in a fully interleaved format, and its size
     * is provided in the camera static metadata by {@link CameraCharacteristics#LENS_INFO_SHADING_MAP_SIZE android.lens.info.shadingMapSize}.</p>
     * <p>The shading map should have on the order of 30-40 rows and columns,
     * and must be smaller than 64x64.</p>
     * <p>As an example, given a very small map defined as:</p>
     * <pre><code>{@link CameraCharacteristics#LENS_INFO_SHADING_MAP_SIZE android.lens.info.shadingMapSize} = [ 4, 3 ]
     * {@link CaptureResult#STATISTICS_LENS_SHADING_MAP android.statistics.lensShadingMap} =
     * [ 1.3, 1.2, 1.15, 1.2,  1.2, 1.2, 1.15, 1.2,
     * 1.1, 1.2, 1.2, 1.2,  1.3, 1.2, 1.3, 1.3,
     * 1.2, 1.2, 1.25, 1.1,  1.1, 1.1, 1.1, 1.0,
     * 1.0, 1.0, 1.0, 1.0,  1.2, 1.3, 1.25, 1.2,
     * 1.3, 1.2, 1.2, 1.3,   1.2, 1.15, 1.1, 1.2,
     * 1.2, 1.1, 1.0, 1.2,  1.3, 1.15, 1.2, 1.3 ]
     * </code></pre>
     * <p>The low-resolution scaling map images for each channel are
     * (displayed using nearest-neighbor interpolation):</p>
     * <p><img alt="Red lens shading map" src="../../../../images/camera2/metadata/android.statistics.lensShadingMap/red_shading.png" />
     * <img alt="Green (even rows) lens shading map" src="../../../../images/camera2/metadata/android.statistics.lensShadingMap/green_e_shading.png" />
     * <img alt="Green (odd rows) lens shading map" src="../../../../images/camera2/metadata/android.statistics.lensShadingMap/green_o_shading.png" />
     * <img alt="Blue lens shading map" src="../../../../images/camera2/metadata/android.statistics.lensShadingMap/blue_shading.png" /></p>
     * <p>As a visualization only, inverting the full-color map to recover an
     * image of a gray wall (using bicubic interpolation for visual quality) as captured by the sensor gives:</p>
     * <p><img alt="Image of a uniform white wall (inverse shading map)" src="../../../../images/camera2/metadata/android.statistics.lensShadingMap/inv_shading.png" /></p>
     *
     * @see CaptureRequest#COLOR_CORRECTION_MODE
     * @see CameraCharacteristics#LENS_INFO_SHADING_MAP_SIZE
     * @see CaptureResult#STATISTICS_LENS_SHADING_MAP
     */
    public static final Key<float[]> STATISTICS_LENS_SHADING_MAP =
            new Key<float[]>("android.statistics.lensShadingMap", float[].class);

    /**
     * <p>The best-fit color channel gains calculated
     * by the HAL's statistics units for the current output frame</p>
     * <p>This may be different than the gains used for this frame,
     * since statistics processing on data from a new frame
     * typically completes after the transform has already been
     * applied to that frame.</p>
     * <p>The 4 channel gains are defined in Bayer domain,
     * see {@link CaptureRequest#COLOR_CORRECTION_GAINS android.colorCorrection.gains} for details.</p>
     * <p>This value should always be calculated by the AWB block,
     * regardless of the android.control.* current values.</p>
     * <p><b>Optional</b> - This value may be {@code null} on some devices.</p>
     *
     * @see CaptureRequest#COLOR_CORRECTION_GAINS
     * @hide
     */
    public static final Key<float[]> STATISTICS_PREDICTED_COLOR_GAINS =
            new Key<float[]>("android.statistics.predictedColorGains", float[].class);

    /**
     * <p>The best-fit color transform matrix estimate
     * calculated by the HAL's statistics units for the current
     * output frame</p>
     * <p>The HAL must provide the estimate from its
     * statistics unit on the white balance transforms to use
     * for the next frame. These are the values the HAL believes
     * are the best fit for the current output frame. This may
     * be different than the transform used for this frame, since
     * statistics processing on data from a new frame typically
     * completes after the transform has already been applied to
     * that frame.</p>
     * <p>These estimates must be provided for all frames, even if
     * capture settings and color transforms are set by the application.</p>
     * <p>This value should always be calculated by the AWB block,
     * regardless of the android.control.* current values.</p>
     * <p><b>Optional</b> - This value may be {@code null} on some devices.</p>
     * @hide
     */
    public static final Key<Rational[]> STATISTICS_PREDICTED_COLOR_TRANSFORM =
            new Key<Rational[]>("android.statistics.predictedColorTransform", Rational[].class);

    /**
     * <p>The HAL estimated scene illumination lighting
     * frequency</p>
     * <p>Report NONE if there doesn't appear to be flickering
     * illumination</p>
     * @see #STATISTICS_SCENE_FLICKER_NONE
     * @see #STATISTICS_SCENE_FLICKER_50HZ
     * @see #STATISTICS_SCENE_FLICKER_60HZ
     */
    public static final Key<Integer> STATISTICS_SCENE_FLICKER =
            new Key<Integer>("android.statistics.sceneFlicker", int.class);

    /**
     * <p>Table mapping blue input values to output
     * values</p>
     * <p>Tonemapping / contrast / gamma curve for the blue
     * channel, to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is CONTRAST_CURVE.</p>
     * <p>See {@link CaptureRequest#TONEMAP_CURVE_RED android.tonemap.curveRed} for more details.</p>
     *
     * @see CaptureRequest#TONEMAP_CURVE_RED
     * @see CaptureRequest#TONEMAP_MODE
     */
    public static final Key<float[]> TONEMAP_CURVE_BLUE =
            new Key<float[]>("android.tonemap.curveBlue", float[].class);

    /**
     * <p>Table mapping green input values to output
     * values</p>
     * <p>Tonemapping / contrast / gamma curve for the green
     * channel, to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is CONTRAST_CURVE.</p>
     * <p>See {@link CaptureRequest#TONEMAP_CURVE_RED android.tonemap.curveRed} for more details.</p>
     *
     * @see CaptureRequest#TONEMAP_CURVE_RED
     * @see CaptureRequest#TONEMAP_MODE
     */
    public static final Key<float[]> TONEMAP_CURVE_GREEN =
            new Key<float[]>("android.tonemap.curveGreen", float[].class);

    /**
     * <p>Table mapping red input values to output
     * values</p>
     * <p>Tonemapping / contrast / gamma curve for the red
     * channel, to use when {@link CaptureRequest#TONEMAP_MODE android.tonemap.mode} is CONTRAST_CURVE.</p>
     * <p>Since the input and output ranges may vary depending on
     * the camera pipeline, the input and output pixel values
     * are represented by normalized floating-point values
     * between 0 and 1, with 0 == black and 1 == white.</p>
     * <p>The curve should be linearly interpolated between the
     * defined points. The points will be listed in increasing
     * order of P_IN. For example, if the array is: [0.0, 0.0,
     * 0.3, 0.5, 1.0, 1.0], then the input-&gt;output mapping
     * for a few sample points would be: 0 -&gt; 0, 0.15 -&gt;
     * 0.25, 0.3 -&gt; 0.5, 0.5 -&gt; 0.64</p>
     *
     * @see CaptureRequest#TONEMAP_MODE
     */
    public static final Key<float[]> TONEMAP_CURVE_RED =
            new Key<float[]>("android.tonemap.curveRed", float[].class);

    /**
     *
     * @see #TONEMAP_MODE_CONTRAST_CURVE
     * @see #TONEMAP_MODE_FAST
     * @see #TONEMAP_MODE_HIGH_QUALITY
     */
    public static final Key<Integer> TONEMAP_MODE =
            new Key<Integer>("android.tonemap.mode", int.class);

    /**
     * <p>This LED is nominally used to indicate to the user
     * that the camera is powered on and may be streaming images back to the
     * Application Processor. In certain rare circumstances, the OS may
     * disable this when video is processed locally and not transmitted to
     * any untrusted applications.</p>
     * <p>In particular, the LED <em>must</em> always be on when the data could be
     * transmitted off the device. The LED <em>should</em> always be on whenever
     * data is stored locally on the device.</p>
     * <p>The LED <em>may</em> be off if a trusted application is using the data that
     * doesn't violate the above rules.</p>
     * @hide
     */
    public static final Key<Boolean> LED_TRANSMIT =
            new Key<Boolean>("android.led.transmit", boolean.class);

    /**
     * <p>Whether black-level compensation is locked
     * to its current values, or is free to vary.</p>
     * <p>Whether the black level offset was locked for this frame.  Should be
     * ON if {@link CaptureRequest#BLACK_LEVEL_LOCK android.blackLevel.lock} was ON in the capture request, unless
     * a change in other capture settings forced the camera device to
     * perform a black level reset.</p>
     *
     * @see CaptureRequest#BLACK_LEVEL_LOCK
     */
    public static final Key<Boolean> BLACK_LEVEL_LOCK =
            new Key<Boolean>("android.blackLevel.lock", boolean.class);

    /*~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~
     * End generated code
     *~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~@~O@*/

    /**
     * <p>
     * List of the {@link Face Faces} detected through camera face detection
     * in this result.
     * </p>
     * <p>
     * Only available if {@link #STATISTICS_FACE_DETECT_MODE} {@code !=}
     * {@link CameraMetadata#STATISTICS_FACE_DETECT_MODE_OFF OFF}.
     * </p>
     *
     * @see Face
     */
    public static final Key<Face[]> STATISTICS_FACES =
            new Key<Face[]>("android.statistics.faces", Face[].class);
}