/*
 * Copyright (C) 2013 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.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.IntDef;
import android.annotation.SystemApi;
import android.annotation.TestApi;
import static android.hardware.camera2.ICameraDeviceUser.NORMAL_MODE;
import static android.hardware.camera2.ICameraDeviceUser.CONSTRAINED_HIGH_SPEED_MODE;
import android.hardware.camera2.params.InputConfiguration;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.hardware.camera2.params.OutputConfiguration;
import android.hardware.camera2.params.SessionConfiguration;
import android.os.Handler;
import android.view.Surface;

import java.util.List;
import java.util.Set;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;

/**
 * <p>The CameraDevice class is a representation of a single camera connected to an
 * Android device, allowing for fine-grain control of image capture and
 * post-processing at high frame rates.</p>
 *
 * <p>Your application must declare the
 * {@link android.Manifest.permission#CAMERA Camera} permission in its manifest
 * in order to access camera devices.</p>
 *
 * <p>A given camera device may provide support at one of several levels defined
 * in {@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}.
 * If a device supports {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY LEGACY} level,
 * the camera device is running in backward compatibility mode and has minimum camera2 API support.
 * If a device supports the {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED}
 * level, then Camera2 exposes a feature set that is roughly equivalent to the older
 * {@link android.hardware.Camera Camera} API, although with a cleaner and more
 * efficient interface.
 * If a device supports the {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_EXTERNAL EXTERNAL}
 * level, then the device is a removable camera that provides similar but slightly less features
 * as the {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} level.
 * Devices that implement the {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL} or
 * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_3 LEVEL3} level of support
 * provide substantially improved capabilities over the older camera
 * API. If your application requires a full-level device for
 * proper operation, declare the "android.hardware.camera.level.full" feature in your
 * manifest.</p>
 *
 * @see CameraManager#openCamera
 * @see android.Manifest.permission#CAMERA
 * @see CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL
 */
public abstract class CameraDevice implements AutoCloseable {

    /**
     * Create a request suitable for a camera preview window. Specifically, this
     * means that high frame rate is given priority over the highest-quality
     * post-processing. These requests would normally be used with the
     * {@link CameraCaptureSession#setRepeatingRequest} method.
     * This template is guaranteed to be supported on all camera devices.
     *
     * @see #createCaptureRequest
     */
    public static final int TEMPLATE_PREVIEW = 1;

    /**
     * Create a request suitable for still image capture. Specifically, this
     * means prioritizing image quality over frame rate. These requests would
     * commonly be used with the {@link CameraCaptureSession#capture} method.
     * This template is guaranteed to be supported on all camera devices except
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT DEPTH_OUTPUT} devices
     * that are not {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE
     * BACKWARD_COMPATIBLE}.
     * @see #createCaptureRequest
     */
    public static final int TEMPLATE_STILL_CAPTURE = 2;

    /**
     * Create a request suitable for video recording. Specifically, this means
     * that a stable frame rate is used, and post-processing is set for
     * recording quality. These requests would commonly be used with the
     * {@link CameraCaptureSession#setRepeatingRequest} method.
     * This template is guaranteed to be supported on all camera devices except
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT DEPTH_OUTPUT} devices
     * that are not {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE
     * BACKWARD_COMPATIBLE}.
     *
     * @see #createCaptureRequest
     */
    public static final int TEMPLATE_RECORD  = 3;

    /**
     * Create a request suitable for still image capture while recording
     * video. Specifically, this means maximizing image quality without
     * disrupting the ongoing recording. These requests would commonly be used
     * with the {@link CameraCaptureSession#capture} method while a request based on
     * {@link #TEMPLATE_RECORD} is is in use with {@link CameraCaptureSession#setRepeatingRequest}.
     * This template is guaranteed to be supported on all camera devices except
     * legacy devices ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY LEGACY}) and
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT DEPTH_OUTPUT} devices
     * that are not {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE
     * BACKWARD_COMPATIBLE}.
     *
     * @see #createCaptureRequest
     */
    public static final int TEMPLATE_VIDEO_SNAPSHOT = 4;

    /**
     * Create a request suitable for zero shutter lag still capture. This means
     * means maximizing image quality without compromising preview frame rate.
     * AE/AWB/AF should be on auto mode. This is intended for application-operated ZSL. For
     * device-operated ZSL, use {@link CaptureRequest#CONTROL_ENABLE_ZSL} if available.
     * This template is guaranteed to be supported on camera devices that support the
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_PRIVATE_REPROCESSING PRIVATE_REPROCESSING}
     * capability or the
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_YUV_REPROCESSING YUV_REPROCESSING}
     * capability.
     *
     * @see #createCaptureRequest
     * @see CaptureRequest#CONTROL_ENABLE_ZSL
     */
    public static final int TEMPLATE_ZERO_SHUTTER_LAG = 5;

    /**
     * A basic template for direct application control of capture
     * parameters. All automatic control is disabled (auto-exposure, auto-white
     * balance, auto-focus), and post-processing parameters are set to preview
     * quality. The manual capture parameters (exposure, sensitivity, and so on)
     * are set to reasonable defaults, but should be overriden by the
     * application depending on the intended use case.
     * This template is guaranteed to be supported on camera devices that support the
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_MANUAL_SENSOR MANUAL_SENSOR}
     * capability.
     *
     * @see #createCaptureRequest
     */
    public static final int TEMPLATE_MANUAL = 6;

     /** @hide */
     @Retention(RetentionPolicy.SOURCE)
     @IntDef(prefix = {"TEMPLATE_"}, value =
         {TEMPLATE_PREVIEW,
          TEMPLATE_STILL_CAPTURE,
          TEMPLATE_RECORD,
          TEMPLATE_VIDEO_SNAPSHOT,
          TEMPLATE_ZERO_SHUTTER_LAG,
          TEMPLATE_MANUAL})
     public @interface RequestTemplate {};

    /**
     * Get the ID of this camera device.
     *
     * <p>This matches the ID given to {@link CameraManager#openCamera} to instantiate this
     * this camera device.</p>
     *
     * <p>This ID can be used to query the camera device's {@link
     * CameraCharacteristics fixed properties} with {@link
     * CameraManager#getCameraCharacteristics}.</p>
     *
     * <p>This method can be called even if the device has been closed or has encountered
     * a serious error.</p>
     *
     * @return the ID for this camera device
     *
     * @see CameraManager#getCameraCharacteristics
     * @see CameraManager#getCameraIdList
     */
    @NonNull
    public abstract String getId();

    /**
     * <p>Create a new camera capture session by providing the target output set of Surfaces to the
     * camera device.</p>
     *
     * <p>The active capture session determines the set of potential output Surfaces for
     * the camera device for each capture request. A given request may use all
     * or only some of the outputs. Once the CameraCaptureSession is created, requests can be
     * submitted with {@link CameraCaptureSession#capture capture},
     * {@link CameraCaptureSession#captureBurst captureBurst},
     * {@link CameraCaptureSession#setRepeatingRequest setRepeatingRequest}, or
     * {@link CameraCaptureSession#setRepeatingBurst setRepeatingBurst}.</p>
     *
     * <p>Surfaces suitable for inclusion as a camera output can be created for
     * various use cases and targets:</p>
     *
     * <ul>
     *
     * <li>For drawing to a {@link android.view.SurfaceView SurfaceView}: Once the SurfaceView's
     *   Surface is {@link android.view.SurfaceHolder.Callback#surfaceCreated created}, set the size
     *   of the Surface with {@link android.view.SurfaceHolder#setFixedSize} to be one of the sizes
     *   returned by {@link StreamConfigurationMap#getOutputSizes(Class)
     *   getOutputSizes(SurfaceHolder.class)} and then obtain the Surface by calling {@link
     *   android.view.SurfaceHolder#getSurface}. If the size is not set by the application, it will
     *   be rounded to the nearest supported size less than 1080p, by the camera device.</li>
     *
     * <li>For accessing through an OpenGL texture via a {@link android.graphics.SurfaceTexture
     *   SurfaceTexture}: Set the size of the SurfaceTexture with {@link
     *   android.graphics.SurfaceTexture#setDefaultBufferSize} to be one of the sizes returned by
     *   {@link StreamConfigurationMap#getOutputSizes(Class) getOutputSizes(SurfaceTexture.class)}
     *   before creating a Surface from the SurfaceTexture with {@link Surface#Surface}. If the size
     *   is not set by the application, it will be set to be the smallest supported size less than
     *   1080p, by the camera device.</li>
     *
     * <li>For recording with {@link android.media.MediaCodec}: Call
     *   {@link android.media.MediaCodec#createInputSurface} after configuring
     *   the media codec to use one of the sizes returned by
     *   {@link StreamConfigurationMap#getOutputSizes(Class) getOutputSizes(MediaCodec.class)}
     *   </li>
     *
     * <li>For recording with {@link android.media.MediaRecorder}: Call
     *   {@link android.media.MediaRecorder#getSurface} after configuring the media recorder to use
     *   one of the sizes returned by
     *   {@link StreamConfigurationMap#getOutputSizes(Class) getOutputSizes(MediaRecorder.class)},
     *   or configuring it to use one of the supported
     *   {@link android.media.CamcorderProfile CamcorderProfiles}.</li>
     *
     * <li>For efficient YUV processing with {@link android.renderscript}:
     *   Create a RenderScript
     *   {@link android.renderscript.Allocation Allocation} with a supported YUV
     *   type, the IO_INPUT flag, and one of the sizes returned by
     *   {@link StreamConfigurationMap#getOutputSizes(Class) getOutputSizes(Allocation.class)},
     *   Then obtain the Surface with
     *   {@link android.renderscript.Allocation#getSurface}.</li>
     *
     * <li>For access to RAW, uncompressed YUV, or compressed JPEG data in the application: Create an
     *   {@link android.media.ImageReader} object with one of the supported output formats given by
     *   {@link StreamConfigurationMap#getOutputFormats()}, setting its size to one of the
     *   corresponding supported sizes by passing the chosen output format into
     *   {@link StreamConfigurationMap#getOutputSizes(int)}. Then obtain a
     *   {@link android.view.Surface} from it with {@link android.media.ImageReader#getSurface()}.
     *   If the ImageReader size is not set to a supported size, it will be rounded to a supported
     *   size less than 1080p by the camera device.
     *   </li>
     *
     * </ul>
     *
     * <p>The camera device will query each Surface's size and formats upon this
     * call, so they must be set to a valid setting at this time.</p>
     *
     * <p>It can take several hundred milliseconds for the session's configuration to complete,
     * since camera hardware may need to be powered on or reconfigured. Once the configuration is
     * complete and the session is ready to actually capture data, the provided
     * {@link CameraCaptureSession.StateCallback}'s
     * {@link CameraCaptureSession.StateCallback#onConfigured} callback will be called.</p>
     *
     * <p>If a prior CameraCaptureSession already exists when this method is called, the previous
     * session will no longer be able to accept new capture requests and will be closed. Any
     * in-progress capture requests made on the prior session will be completed before it's closed.
     * {@link CameraCaptureSession.StateCallback#onConfigured} for the new session may be invoked
     * before {@link CameraCaptureSession.StateCallback#onClosed} is invoked for the prior
     * session. Once the new session is {@link CameraCaptureSession.StateCallback#onConfigured
     * configured}, it is able to start capturing its own requests. To minimize the transition time,
     * the {@link CameraCaptureSession#abortCaptures} call can be used to discard the remaining
     * requests for the prior capture session before a new one is created. Note that once the new
     * session is created, the old one can no longer have its captures aborted.</p>
     *
     * <p>Using larger resolution outputs, or more outputs, can result in slower
     * output rate from the device.</p>
     *
     * <p>Configuring a session with an empty or null list will close the current session, if
     * any. This can be used to release the current session's target surfaces for another use.</p>
     *
     * <p>While any of the sizes from {@link StreamConfigurationMap#getOutputSizes} can be used when
     * a single output stream is configured, a given camera device may not be able to support all
     * combination of sizes, formats, and targets when multiple outputs are configured at once.  The
     * tables below list the maximum guaranteed resolutions for combinations of streams and targets,
     * given the capabilities of the camera device.</p>
     *
     * <p>If an application tries to create a session using a set of targets that exceed the limits
     * described in the below tables, one of three possibilities may occur. First, the session may
     * be successfully created and work normally. Second, the session may be successfully created,
     * but the camera device won't meet the frame rate guarantees as described in
     * {@link StreamConfigurationMap#getOutputMinFrameDuration}. Or third, if the output set
     * cannot be used at all, session creation will fail entirely, with
     * {@link CameraCaptureSession.StateCallback#onConfigureFailed} being invoked.</p>
     *
     * <p>For the type column, {@code PRIV} refers to any target whose available sizes are found
     * using {@link StreamConfigurationMap#getOutputSizes(Class)} with no direct application-visible
     * format, {@code YUV} refers to a target Surface using the
     * {@link android.graphics.ImageFormat#YUV_420_888} format, {@code JPEG} refers to the
     * {@link android.graphics.ImageFormat#JPEG} format, and {@code RAW} refers to the
     * {@link android.graphics.ImageFormat#RAW_SENSOR} format.</p>
     *
     * <p>For the maximum size column, {@code PREVIEW} refers to the best size match to the
     * device's screen resolution, or to 1080p ({@code 1920x1080}), whichever is
     * smaller. {@code RECORD} refers to the camera device's maximum supported recording resolution,
     * as determined by {@link android.media.CamcorderProfile}. And {@code MAXIMUM} refers to the
     * camera device's maximum output resolution for that format or target from
     * {@link StreamConfigurationMap#getOutputSizes}.</p>
     *
     * <p>To use these tables, determine the number and the formats/targets of outputs needed, and
     * find the row(s) of the table with those targets. The sizes indicate the maximum set of sizes
     * that can be used; it is guaranteed that for those targets, the listed sizes and anything
     * smaller from the list given by {@link StreamConfigurationMap#getOutputSizes} can be
     * successfully used to create a session.  For example, if a row indicates that a 8 megapixel
     * (MP) YUV_420_888 output can be used together with a 2 MP {@code PRIV} output, then a session
     * can be created with targets {@code [8 MP YUV, 2 MP PRIV]} or targets {@code [2 MP YUV, 2 MP
     * PRIV]}; but a session with targets {@code [8 MP YUV, 4 MP PRIV]}, targets {@code [4 MP YUV, 4
     * MP PRIV]}, or targets {@code [8 MP PRIV, 2 MP YUV]} would not be guaranteed to work, unless
     * some other row of the table lists such a combination.</p>
     *
     * <style scoped>
     *  #rb { border-right-width: thick; }
     * </style>
     * <p>Legacy devices ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY LEGACY}) support at
     * least the following stream combinations:
     *
     * <table>
     * <tr><th colspan="7">LEGACY-level guaranteed configurations</th></tr>
     * <tr> <th colspan="2" id="rb">Target 1</th> <th colspan="2" id="rb">Target 2</th>  <th colspan="2" id="rb">Target 3</th> <th rowspan="2">Sample use case(s)</th> </tr>
     * <tr> <th>Type</th><th id="rb">Max size</th> <th>Type</th><th id="rb">Max size</th> <th>Type</th><th id="rb">Max size</th></tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td colspan="2" id="rb"></td> <td>Simple preview, GPU video processing, or no-preview video recording.</td> </tr>
     * <tr> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td colspan="2" id="rb"></td> <td>No-viewfinder still image capture.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td colspan="2" id="rb"></td> <td>In-application video/image processing.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>Standard still imaging.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>In-app processing plus still capture.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td colspan="2" id="rb"></td> <td>Standard recording.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td colspan="2" id="rb"></td> <td>Preview plus in-app processing.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>Still capture plus in-app processing.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>Limited-level ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED}) devices
     * support at least the following stream combinations in addition to those for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY LEGACY} devices:
     *
     * <table>
     * <tr><th colspan="7">LIMITED-level additional guaranteed configurations</th></tr>
     * <tr><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th> <th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th></tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code RECORD }</td> <td colspan="2" id="rb"></td> <td>High-resolution video recording with preview.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code RECORD }</td> <td colspan="2" id="rb"></td> <td>High-resolution in-app video processing with preview.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code RECORD }</td> <td colspan="2" id="rb"></td> <td>Two-input in-app video processing.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code RECORD }</td> <td>{@code JPEG}</td><td id="rb">{@code RECORD }</td> <td>High-resolution recording with video snapshot.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code RECORD }</td> <td>{@code JPEG}</td><td id="rb">{@code RECORD }</td> <td>High-resolution in-app processing with video snapshot.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>Two-input in-app processing with still capture.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>FULL-level ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL}) devices
     * support at least the following stream combinations in addition to those for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} devices:
     *
     * <table>
     * <tr><th colspan="7">FULL-level additional guaranteed configurations</th></tr>
     * <tr><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th> <th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>Maximum-resolution GPU processing with preview.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>Maximum-resolution in-app processing with preview.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>Maximum-resolution two-input in-app processsing.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>Video recording with maximum-size video snapshot</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code 640x480}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td>Standard video recording plus maximum-resolution in-app processing.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code 640x480}</td> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td>Preview plus two-input maximum-resolution in-app processing.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>RAW-capability ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES} includes
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_RAW RAW}) devices additionally support
     * at least the following stream combinations on both
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL} and
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} devices:
     *
     * <table>
     * <tr><th colspan="7">RAW-capability additional guaranteed configurations</th></tr>
     * <tr><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th> <th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th> </tr>
     * <tr> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td colspan="2" id="rb"></td> <td>No-preview DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>Standard DNG capture.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td colspan="2" id="rb"></td> <td>In-app processing plus DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td>Video recording with DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td>Preview with in-app processing and DNG capture.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td>Two-input in-app processing plus DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td>Still capture with simultaneous JPEG and DNG.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code RAW }</td><td id="rb">{@code MAXIMUM}</td> <td>In-app processing with simultaneous JPEG and DNG.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>BURST-capability ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES} includes
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_BURST_CAPTURE BURST_CAPTURE}) devices
     * support at least the below stream combinations in addition to those for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} devices. Note that all
     * FULL-level devices support the BURST capability, and the below list is a strict subset of the
     * list for FULL-level devices, so this table is only relevant for LIMITED-level devices that
     * support the BURST_CAPTURE capability.
     *
     * <table>
     * <tr><th colspan="5">BURST-capability additional guaranteed configurations</th></tr>
     * <tr><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td>Maximum-resolution GPU processing with preview.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td>Maximum-resolution in-app processing with preview.</td> </tr>
     * <tr> <td>{@code YUV }</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV }</td><td id="rb">{@code MAXIMUM}</td> <td>Maximum-resolution two-input in-app processsing.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>LEVEL-3 ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_3 LEVEL_3})
     * support at least the following stream combinations in addition to the combinations for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL} and for
     * RAW capability ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES} includes
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_RAW RAW}):
     *
     * <table>
     * <tr><th colspan="11">LEVEL-3 additional guaranteed configurations</th></tr>
     * <tr><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th><th colspan="2" id="rb">Target 4</th><th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code 640x480}</td> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>In-app viewfinder analysis with dynamic selection of output format.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code 640x480}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>In-app viewfinder analysis with dynamic selection of output format.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>MONOCHROME-capability ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES}
     * includes {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_MONOCHROME MONOCHROME}) devices
     * supporting {@link android.graphics.ImageFormat#Y8 Y8} support substituting {@code YUV}
     * streams with {@code Y8} in all guaranteed stream combinations for the device's hardware level
     * and capabilities.</p>
     *
     * <p>Devices capable of outputting HEIC formats ({@link StreamConfigurationMap#getOutputFormats}
     * contains {@link android.graphics.ImageFormat#HEIC}) will support substituting {@code JPEG}
     * streams with {@code HEIC} in all guaranteed stream combinations for the device's hardware
     * level and capabilities. Calling createCaptureSession with both JPEG and HEIC outputs is not
     * supported.</p>
     *
     * <p>Clients can access the above mandatory stream combination tables via
     * {@link android.hardware.camera2.params.MandatoryStreamCombination}.</p>
     *
     * <p>Since the capabilities of camera devices vary greatly, a given camera device may support
     * target combinations with sizes outside of these guarantees, but this can only be tested for
     * by calling {@link #isSessionConfigurationSupported} or attempting to create a session with
     * such targets.</p>
     *
     * <p>Exception on 176x144 (QCIF) resolution:
     * Camera devices usually have a fixed capability for downscaling from larger resolution to
     * smaller, and the QCIF resolution sometimes is not fully supported due to this
     * limitation on devices with high-resolution image sensors. Therefore, trying to configure a
     * QCIF resolution stream together with any other stream larger than 1920x1080 resolution
     * (either width or height) might not be supported, and capture session creation will fail if it
     * is not.</p>
     *
     * @param outputs The new set of Surfaces that should be made available as
     *                targets for captured image data.
     * @param callback The callback to notify about the status of the new capture session.
     * @param handler The handler on which the callback should be invoked, or {@code null} to use
     *                the current thread's {@link android.os.Looper looper}.
     *
     * @throws IllegalArgumentException if the set of output Surfaces do not meet the requirements,
     *                                  the callback is null, or the handler is null but the current
     *                                  thread has no looper.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     *
     * @see CameraCaptureSession
     * @see StreamConfigurationMap#getOutputFormats()
     * @see StreamConfigurationMap#getOutputSizes(int)
     * @see StreamConfigurationMap#getOutputSizes(Class)
     */
    public abstract void createCaptureSession(@NonNull List<Surface> outputs,
            @NonNull CameraCaptureSession.StateCallback callback, @Nullable Handler handler)
            throws CameraAccessException;

    /**
     * <p>Create a new camera capture session by providing the target output set of Surfaces and
     * its corresponding surface configuration to the camera device.</p>
     *
     * @see #createCaptureSession
     * @see OutputConfiguration
     */
    public abstract void createCaptureSessionByOutputConfigurations(
            List<OutputConfiguration> outputConfigurations,
            CameraCaptureSession.StateCallback callback, @Nullable Handler handler)
            throws CameraAccessException;
    /**
     * Create a new reprocessable camera capture session by providing the desired reprocessing
     * input Surface configuration and the target output set of Surfaces to the camera device.
     *
     * <p>If a camera device supports YUV reprocessing
     * ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES_YUV_REPROCESSING}) or PRIVATE
     * reprocessing
     * ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES_PRIVATE_REPROCESSING}), besides
     * the capture session created via {@link #createCaptureSession createCaptureSession}, the
     * application can also create a reprocessable capture session to submit reprocess capture
     * requests in addition to regular capture requests. A reprocess capture request takes the next
     * available buffer from the session's input Surface, and sends it through the camera device's
     * processing pipeline again, to produce buffers for the request's target output Surfaces. No
     * new image data is captured for a reprocess request. However the input buffer provided by
     * the application must be captured previously by the same camera device in the same session
     * directly (e.g. for Zero-Shutter-Lag use case) or indirectly (e.g. combining multiple output
     * images).</p>
     *
     * <p>The active reprocessable capture session determines an input {@link Surface} and the set
     * of potential output Surfaces for the camera devices for each capture request. The application
     * can use {@link #createCaptureRequest createCaptureRequest} to create regular capture requests
     * to capture new images from the camera device, and use {@link #createReprocessCaptureRequest
     * createReprocessCaptureRequest} to create reprocess capture requests to process buffers from
     * the input {@link Surface}. Some combinations of output Surfaces in a session may not be used
     * in a request simultaneously. The guaranteed combinations of output Surfaces that can be used
     * in a request simultaneously are listed in the tables under {@link #createCaptureSession
     * createCaptureSession}. All the output Surfaces in one capture request will come from the
     * same source, either from a new capture by the camera device, or from the input Surface
     * depending on if the request is a reprocess capture request.</p>
     *
     * <p>Input formats and sizes supported by the camera device can be queried via
     * {@link StreamConfigurationMap#getInputFormats} and
     * {@link StreamConfigurationMap#getInputSizes}. For each supported input format, the camera
     * device supports a set of output formats and sizes for reprocessing that can be queried via
     * {@link StreamConfigurationMap#getValidOutputFormatsForInput} and
     * {@link StreamConfigurationMap#getOutputSizes}. While output Surfaces with formats that
     * aren't valid reprocess output targets for the input configuration can be part of a session,
     * they cannot be used as targets for a reprocessing request.</p>
     *
     * <p>Since the application cannot access {@link android.graphics.ImageFormat#PRIVATE} images
     * directly, an output Surface created by {@link android.media.ImageReader#newInstance} with
     * {@link android.graphics.ImageFormat#PRIVATE} as the format will be considered as intended to
     * be used for reprocessing input and thus the {@link android.media.ImageReader} size must
     * match one of the supported input sizes for {@link android.graphics.ImageFormat#PRIVATE}
     * format. Otherwise, creating a reprocessable capture session will fail.</p>
     *
     * <p>The guaranteed stream configurations listed in
     * {@link #createCaptureSession createCaptureSession} are also guaranteed to work for
     * {@link #createReprocessableCaptureSession createReprocessableCaptureSession}. In addition,
     * the configurations in the tables below are also guaranteed for creating a reprocessable
     * capture session if the camera device supports YUV reprocessing or PRIVATE reprocessing.
     * However, not all output targets used to create a reprocessable session may be used in a
     * {@link CaptureRequest} simultaneously. For devices that support only 1 output target in a
     * reprocess {@link CaptureRequest}, submitting a reprocess {@link CaptureRequest} with multiple
     * output targets will result in a {@link CaptureFailure}. For devices that support multiple
     * output targets in a reprocess {@link CaptureRequest}, the guaranteed output targets that can
     * be included in a {@link CaptureRequest} simultaneously are listed in the tables under
     * {@link #createCaptureSession createCaptureSession}. For example, with a FULL-capability
     * ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL} {@code == }
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL}) device that supports PRIVATE
     * reprocessing, an application can create a reprocessable capture session with 1 input,
     * ({@code PRIV}, {@code MAXIMUM}), and 3 outputs, ({@code PRIV}, {@code MAXIMUM}),
     * ({@code PRIV}, {@code PREVIEW}), and ({@code YUV}, {@code MAXIMUM}). However, it's not
     * guaranteed that an application can submit a regular or reprocess capture with ({@code PRIV},
     * {@code MAXIMUM}) and ({@code YUV}, {@code MAXIMUM}) outputs based on the table listed under
     * {@link #createCaptureSession createCaptureSession}. In other words, use the tables below to
     * determine the guaranteed stream configurations for creating a reprocessable capture session,
     * and use the tables under {@link #createCaptureSession createCaptureSession} to determine the
     * guaranteed output targets that can be submitted in a regular or reprocess
     * {@link CaptureRequest} simultaneously.</p>
     *
     * <style scoped>
     *  #rb { border-right-width: thick; }
     * </style>
     *
     * <p>LIMITED-level ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED}) devices
     * support at least the following stream combinations for creating a reprocessable capture
     * session in addition to those listed in {@link #createCaptureSession createCaptureSession} for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} devices:
     *
     * <table>
     * <tr><th colspan="11">LIMITED-level additional guaranteed configurations for creating a reprocessable capture session<br>({@code PRIV} input is guaranteed only if PRIVATE reprocessing is supported. {@code YUV} input is guaranteed only if YUV reprocessing is supported)</th></tr>
     * <tr><th colspan="2" id="rb">Input</th><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th><th colspan="2" id="rb">Target 4</th><th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th></tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td></td><td id="rb"></td> <td>No-viewfinder still image reprocessing.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td>ZSL(Zero-Shutter-Lag) still imaging.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td>ZSL still and in-app processing imaging.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>ZSL in-app processing with still capture.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>FULL-level ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL}) devices
     * support at least the following stream combinations for creating a reprocessable capture
     * session in addition to those for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} devices:
     *
     * <table>
     * <tr><th colspan="11">FULL-level additional guaranteed configurations for creating a reprocessable capture session<br>({@code PRIV} input is guaranteed only if PRIVATE reprocessing is supported. {@code YUV} input is guaranteed only if YUV reprocessing is supported)</th></tr>
     * <tr><th colspan="2" id="rb">Input</th><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th><th colspan="2" id="rb">Target 4</th><th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th></tr>
     * <tr> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td></td><td id="rb"></td> <td></td><td id="rb"></td> <td>Maximum-resolution multi-frame image fusion in-app processing with regular preview.</td> </tr>
     * <tr> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td></td><td id="rb"></td> <td></td><td id="rb"></td> <td>Maximum-resolution multi-frame image fusion two-input in-app processing.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code RECORD}</td> <td></td><td id="rb"></td> <td>High-resolution ZSL in-app video processing with regular preview.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td>Maximum-resolution ZSL in-app processing with regular preview.</td> </tr>
     * <tr> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td>Maximum-resolution two-input ZSL in-app processing.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>ZSL still capture and in-app processing.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>RAW-capability ({@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES} includes
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_RAW RAW}) devices additionally support
     * at least the following stream combinations for creating a reprocessable capture session
     * on both {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL} and
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED LIMITED} devices
     *
     * <table>
     * <tr><th colspan="11">RAW-capability additional guaranteed configurations for creating a reprocessable capture session<br>({@code PRIV} input is guaranteed only if PRIVATE reprocessing is supported. {@code YUV} input is guaranteed only if YUV reprocessing is supported)</th></tr>
     * <tr><th colspan="2" id="rb">Input</th><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th><th colspan="2" id="rb">Target 4</th><th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th></tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td>Mutually exclusive ZSL in-app processing and DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>Mutually exclusive ZSL in-app processing and preview with DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>Mutually exclusive ZSL two-input in-app processing and DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>Mutually exclusive ZSL still capture and preview with DNG capture.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>Mutually exclusive ZSL in-app processing with still capture and DNG capture.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>LEVEL-3 ({@link CameraCharacteristics#INFO_SUPPORTED_HARDWARE_LEVEL}
     * {@code == }{@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_3 LEVEL_3}) devices
     * support at least the following stream combinations for creating a reprocessable capture
     * session in addition to those for
     * {@link CameraMetadata#INFO_SUPPORTED_HARDWARE_LEVEL_FULL FULL} devices. Note that while
     * the second configuration allows for configuring {@code MAXIMUM} {@code YUV} and {@code JPEG}
     * outputs at the same time, that configuration is not listed for regular capture sessions, and
     * therefore simultaneous output to both targets is not allowed.
     *
     * <table>
     * <tr><th colspan="13">LEVEL-3 additional guaranteed configurations for creating a reprocessable capture session<br>({@code PRIV} input is guaranteed only if PRIVATE reprocessing is supported. {@code YUV} input is always guaranteed.</th></tr>
     * <tr><th colspan="2" id="rb">Input</th><th colspan="2" id="rb">Target 1</th><th colspan="2" id="rb">Target 2</th><th colspan="2" id="rb">Target 3</th><th colspan="2" id="rb">Target 4</th><th colspan="2" id="rb">Target 5</th><th rowspan="2">Sample use case(s)</th> </tr>
     * <tr><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th><th>Type</th><th id="rb">Max size</th></tr>
     * <tr> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code 640x480}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td></td><td id="rb"></td> <td>In-app viewfinder analysis with ZSL and RAW.</td> </tr>
     * <tr> <td>{@code PRIV}/{@code YUV}</td><td id="rb">{@code MAXIMUM}</td> <td>Same as input</td><td id="rb">{@code MAXIMUM}</td> <td>{@code PRIV}</td><td id="rb">{@code PREVIEW}</td> <td>{@code PRIV}</td><td id="rb">{@code 640x480}</td> <td>{@code RAW}</td><td id="rb">{@code MAXIMUM}</td> <td>{@code JPEG}</td><td id="rb">{@code MAXIMUM}</td><td>In-app viewfinder analysis with ZSL, RAW, and JPEG reprocessing output.</td> </tr>
     * </table><br>
     * </p>
     *
     * <p>Clients can access the above mandatory stream combination tables via
     * {@link android.hardware.camera2.params.MandatoryStreamCombination}.</p>
     *
     * @param inputConfig The configuration for the input {@link Surface}
     * @param outputs The new set of Surfaces that should be made available as
     *                targets for captured image data.
     * @param callback The callback to notify about the status of the new capture session.
     * @param handler The handler on which the callback should be invoked, or {@code null} to use
     *                the current thread's {@link android.os.Looper looper}.
     *
     * @throws IllegalArgumentException if the input configuration is null or not supported, the set
     *                                  of output Surfaces do not meet the requirements, the
     *                                  callback is null, or the handler is null but the current
     *                                  thread has no looper.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     *
     * @see #createCaptureSession
     * @see CameraCaptureSession
     * @see StreamConfigurationMap#getInputFormats
     * @see StreamConfigurationMap#getInputSizes
     * @see StreamConfigurationMap#getValidOutputFormatsForInput
     * @see StreamConfigurationMap#getOutputSizes
     * @see android.media.ImageWriter
     * @see android.media.ImageReader
     */
    public abstract void createReprocessableCaptureSession(@NonNull InputConfiguration inputConfig,
            @NonNull List<Surface> outputs, @NonNull CameraCaptureSession.StateCallback callback,
            @Nullable Handler handler)
            throws CameraAccessException;

    /**
     * Create a new reprocessable camera capture session by providing the desired reprocessing
     * input configuration and output {@link OutputConfiguration}
     * to the camera device.
     *
     * @see #createReprocessableCaptureSession
     * @see OutputConfiguration
     *
     */
    public abstract void createReprocessableCaptureSessionByConfigurations(
            @NonNull InputConfiguration inputConfig,
            @NonNull List<OutputConfiguration> outputs,
            @NonNull CameraCaptureSession.StateCallback callback,
            @Nullable Handler handler)
            throws CameraAccessException;

    /**
     * <p>Create a new constrained high speed capture session.</p>
     *
     * <p>The application can use normal capture session (created via {@link #createCaptureSession})
     * for high speed capture if the desired high speed FPS ranges are advertised by
     * {@link CameraCharacteristics#CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES}, in which case all API
     * semantics associated with normal capture sessions applies.</p>
     *
     * <p>The method creates a specialized capture session that is only targeted at high speed
     * video recording (>=120fps) use case if the camera device supports high speed video
     * capability (i.e., {@link CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES} contains
     * {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_CONSTRAINED_HIGH_SPEED_VIDEO}).
     * Therefore, it has special characteristics compared with a normal capture session:</p>
     *
     * <ul>
     *
     * <li>In addition to the output target Surface requirements specified by the
     *   {@link #createCaptureSession} method, an active high speed capture session will support up
     *   to 2 output Surfaces, though the application might choose to configure just one Surface
     *   (e.g., preview only). All Surfaces must be either video encoder surfaces (acquired by
     *   {@link android.media.MediaRecorder#getSurface} or
     *   {@link android.media.MediaCodec#createInputSurface}) or preview surfaces (obtained from
     *   {@link android.view.SurfaceView}, {@link android.graphics.SurfaceTexture} via
     *   {@link android.view.Surface#Surface(android.graphics.SurfaceTexture)}). The Surface sizes
     *   must be one of the sizes reported by {@link StreamConfigurationMap#getHighSpeedVideoSizes}.
     *   When multiple Surfaces are configured, their size must be same.</li>
     *
     * <li>An active high speed capture session only accepts request lists created via
     *   {@link CameraConstrainedHighSpeedCaptureSession#createHighSpeedRequestList}, and the
     *   request list can only be submitted to this session via
     *   {@link CameraCaptureSession#captureBurst captureBurst}, or
     *   {@link CameraCaptureSession#setRepeatingBurst setRepeatingBurst}.</li>
     *
     * <li>The FPS ranges being requested to this session must be selected from
     *   {@link StreamConfigurationMap#getHighSpeedVideoFpsRangesFor}. The application can still use
     *   {@link CaptureRequest#CONTROL_AE_TARGET_FPS_RANGE} to control the desired FPS range.
     *   Switching to an FPS range that has different
     *   {@link android.util.Range#getUpper() maximum FPS} may trigger some camera device
     *   reconfigurations, which may introduce extra latency. It is recommended that the
     *   application avoids unnecessary maximum target FPS changes as much as possible during high
     *   speed streaming.</li>
     *
     * <li>For the request lists submitted to this session, the camera device will override the
     *   {@link CaptureRequest#CONTROL_MODE control mode}, auto-exposure (AE), auto-white balance
     *   (AWB) and auto-focus (AF) to {@link CameraMetadata#CONTROL_MODE_AUTO},
     *   {@link CameraMetadata#CONTROL_AE_MODE_ON}, {@link CameraMetadata#CONTROL_AWB_MODE_AUTO}
     *   and {@link CameraMetadata#CONTROL_AF_MODE_CONTINUOUS_VIDEO}, respectively. All
     *   post-processing block mode controls will be overridden to be FAST. Therefore, no manual
     *   control of capture and post-processing parameters is possible. Beside these, only a subset
     *   of controls will work, see
     *   {@link CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_CONSTRAINED_HIGH_SPEED_VIDEO} for
     *   more details.</li>
     *
     * </ul>
     *
     * @param outputs The new set of Surfaces that should be made available as
     *                targets for captured high speed image data.
     * @param callback The callback to notify about the status of the new capture session.
     * @param handler The handler on which the callback should be invoked, or {@code null} to use
     *                the current thread's {@link android.os.Looper looper}.
     *
     * @throws IllegalArgumentException if the set of output Surfaces do not meet the requirements,
     *                                  the callback is null, or the handler is null but the current
     *                                  thread has no looper, or the camera device doesn't support
     *                                  high speed video capability.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     *
     * @see #createCaptureSession
     * @see CaptureRequest#CONTROL_AE_TARGET_FPS_RANGE
     * @see StreamConfigurationMap#getHighSpeedVideoSizes
     * @see StreamConfigurationMap#getHighSpeedVideoFpsRangesFor
     * @see CameraCharacteristics#REQUEST_AVAILABLE_CAPABILITIES
     * @see CameraMetadata#REQUEST_AVAILABLE_CAPABILITIES_CONSTRAINED_HIGH_SPEED_VIDEO
     * @see CameraCaptureSession#captureBurst
     * @see CameraCaptureSession#setRepeatingBurst
     * @see CameraConstrainedHighSpeedCaptureSession#createHighSpeedRequestList
     */
    public abstract void createConstrainedHighSpeedCaptureSession(@NonNull List<Surface> outputs,
            @NonNull CameraCaptureSession.StateCallback callback,
            @Nullable Handler handler)
            throws CameraAccessException;

    /**
     * Standard camera operation mode.
     *
     * @see #createCustomCaptureSession
     * @hide
     */
    @SystemApi
    @TestApi
    public static final int SESSION_OPERATION_MODE_NORMAL =
            0; // ICameraDeviceUser.NORMAL_MODE;

    /**
     * Constrained high-speed operation mode.
     *
     * @see #createCustomCaptureSession
     * @hide
     */
    @SystemApi
    @TestApi
    public static final int SESSION_OPERATION_MODE_CONSTRAINED_HIGH_SPEED =
            1; // ICameraDeviceUser.CONSTRAINED_HIGH_SPEED_MODE;

    /**
     * First vendor-specific operating mode
     *
     * @see #createCustomCaptureSession
     * @hide
     */
    @SystemApi
    @TestApi
    public static final int SESSION_OPERATION_MODE_VENDOR_START =
            0x8000; // ICameraDeviceUser.VENDOR_MODE_START;

    /** @hide */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef(prefix = {"SESSION_OPERATION_MODE"}, value =
            {SESSION_OPERATION_MODE_NORMAL,
             SESSION_OPERATION_MODE_CONSTRAINED_HIGH_SPEED,
             SESSION_OPERATION_MODE_VENDOR_START})
    public @interface SessionOperatingMode {};

    /**
     * Create a new camera capture session with a custom operating mode.
     *
     * @param inputConfig The configuration for the input {@link Surface} if a reprocessing session
     *                is desired, or {@code null} otherwise.
     * @param outputs The new set of {@link OutputConfiguration OutputConfigurations} that should be
     *                made available as targets for captured image data.
     * @param operatingMode The custom operating mode to use; a nonnegative value, either a custom
     *                vendor value or one of the SESSION_OPERATION_MODE_* values.
     * @param callback The callback to notify about the status of the new capture session.
     * @param handler The handler on which the callback should be invoked, or {@code null} to use
     *                the current thread's {@link android.os.Looper looper}.
     *
     * @throws IllegalArgumentException if the input configuration is null or not supported, the set
     *                                  of output Surfaces do not meet the requirements, the
     *                                  callback is null, or the handler is null but the current
     *                                  thread has no looper.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     *
     * @see #createCaptureSession
     * @see #createReprocessableCaptureSession
     * @see CameraCaptureSession
     * @see OutputConfiguration
     * @hide
     */
    @SystemApi
    @TestApi
    public abstract void createCustomCaptureSession(
            InputConfiguration inputConfig,
            @NonNull List<OutputConfiguration> outputs,
            @SessionOperatingMode int operatingMode,
            @NonNull CameraCaptureSession.StateCallback callback,
            @Nullable Handler handler)
            throws CameraAccessException;

    /**
     * <p>Create a new {@link CameraCaptureSession} using a {@link SessionConfiguration} helper
     * object that aggregates all supported parameters.</p>
     *
     * @param config A session configuration (see {@link SessionConfiguration}).
     *
     * @throws IllegalArgumentException In case the session configuration is invalid; or the output
     *                                  configurations are empty; or the session configuration
     *                                  executor is invalid.
     * @throws CameraAccessException In case the camera device is no longer connected or has
     *                               encountered a fatal error.
     * @see #createCaptureSession(List, CameraCaptureSession.StateCallback, Handler)
     * @see #createCaptureSessionByOutputConfigurations
     * @see #createReprocessableCaptureSession
     * @see #createConstrainedHighSpeedCaptureSession
     */
    public void createCaptureSession(
            SessionConfiguration config) throws CameraAccessException {
        throw new UnsupportedOperationException("No default implementation");
    }

    /**
     * <p>Create a {@link CaptureRequest.Builder} for new capture requests,
     * initialized with template for a target use case. The settings are chosen
     * to be the best options for the specific camera device, so it is not
     * recommended to reuse the same request for a different camera device;
     * create a builder specific for that device and template and override the
     * settings as desired, instead.</p>
     *
     * @param templateType An enumeration selecting the use case for this request. Not all template
     * types are supported on every device. See the documentation for each template type for
     * details.
     * @return a builder for a capture request, initialized with default
     * settings for that template, and no output streams
     *
     * @throws IllegalArgumentException if the templateType is not supported by
     * this device.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     */
    @NonNull
    public abstract CaptureRequest.Builder createCaptureRequest(@RequestTemplate int templateType)
            throws CameraAccessException;

    /**
     * <p>Create a {@link CaptureRequest.Builder} for new capture requests,
     * initialized with template for a target use case. This methods allows
     * clients to pass physical camera ids which can be used to customize the
     * request for a specific physical camera. The settings are chosen
     * to be the best options for the specific logical camera device. If
     * additional physical camera ids are passed, then they will also use the
     * same settings template. Clients can further modify individual camera
     * settings by calling {@link CaptureRequest.Builder#setPhysicalCameraKey}.</p>
     *
     * <p>Individual physical camera settings will only be honored for camera session
     * that was initialiazed with corresponding physical camera id output configuration
     * {@link OutputConfiguration#setPhysicalCameraId} and the same output targets are
     * also attached in the request by {@link CaptureRequest.Builder#addTarget}.</p>
     *
     * <p>The output is undefined for any logical camera streams in case valid physical camera
     * settings are attached.</p>
     *
     * @param templateType An enumeration selecting the use case for this request. Not all template
     * types are supported on every device. See the documentation for each template type for
     * details.
     * @param physicalCameraIdSet A set of physical camera ids that can be used to customize
     *                            the request for a specific physical camera.
     * @return a builder for a capture request, initialized with default
     * settings for that template, and no output streams
     *
     * @throws IllegalArgumentException if the templateType is not supported by
     * this device, or one of the physical id arguments matches with logical camera id.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     *
     * @see #TEMPLATE_PREVIEW
     * @see #TEMPLATE_RECORD
     * @see #TEMPLATE_STILL_CAPTURE
     * @see #TEMPLATE_VIDEO_SNAPSHOT
     * @see #TEMPLATE_MANUAL
     * @see CaptureRequest.Builder#setPhysicalCameraKey
     * @see CaptureRequest.Builder#getPhysicalCameraKey
     */
    @NonNull
    public CaptureRequest.Builder createCaptureRequest(@RequestTemplate int templateType,
            Set<String> physicalCameraIdSet) throws CameraAccessException {
        throw new UnsupportedOperationException("Subclasses must override this method");
    }

    /**
     * <p>Create a {@link CaptureRequest.Builder} for a new reprocess {@link CaptureRequest} from a
     * {@link TotalCaptureResult}.
     *
     * <p>Each reprocess {@link CaptureRequest} processes one buffer from
     * {@link CameraCaptureSession}'s input {@link Surface} to all output {@link Surface Surfaces}
     * included in the reprocess capture request. The reprocess input images must be generated from
     * one or multiple output images captured from the same camera device. The application can
     * provide input images to camera device via {@link android.media.ImageWriter#queueInputImage}.
     * The application must use the capture result of one of those output images to create a
     * reprocess capture request so that the camera device can use the information to achieve
     * optimal reprocess image quality. For camera devices that support only 1 output
     * {@link Surface}, submitting a reprocess {@link CaptureRequest} with multiple
     * output targets will result in a {@link CaptureFailure}.
     *
     * @param inputResult The capture result of the output image or one of the output images used
     *                       to generate the reprocess input image for this capture request.
     *
     * @throws IllegalArgumentException if inputResult is null.
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     *
     * @see CaptureRequest.Builder
     * @see TotalCaptureResult
     * @see CameraDevice#createReprocessableCaptureSession
     * @see android.media.ImageWriter
     */
    @NonNull
    public abstract CaptureRequest.Builder createReprocessCaptureRequest(
            @NonNull TotalCaptureResult inputResult) throws CameraAccessException;

    /**
     * Close the connection to this camera device as quickly as possible.
     *
     * <p>Immediately after this call, all calls to the camera device or active session interface
     * will throw a {@link IllegalStateException}, except for calls to close(). Once the device has
     * fully shut down, the {@link StateCallback#onClosed} callback will be called, and the camera
     * is free to be re-opened.</p>
     *
     * <p>Immediately after this call, besides the final {@link StateCallback#onClosed} calls, no
     * further callbacks from the device or the active session will occur, and any remaining
     * submitted capture requests will be discarded, as if
     * {@link CameraCaptureSession#abortCaptures} had been called, except that no success or failure
     * callbacks will be invoked.</p>
     *
     */
    @Override
    public abstract void close();

    /**
     * Checks whether a particular {@link SessionConfiguration} is supported by the camera device.
     *
     * <p>This method performs a runtime check of a given {@link SessionConfiguration}. The result
     * confirms whether or not the passed session configuration can be successfully used to
     * create a camera capture session using
     * {@link CameraDevice#createCaptureSession(SessionConfiguration)}.
     * </p>
     *
     * <p>The method can be called at any point before, during and after active capture session.
     * It must not impact normal camera behavior in any way and must complete significantly
     * faster than creating a regular or constrained capture session.</p>
     *
     * <p>Although this method is faster than creating a new capture session, it is not intended
     * to be used for exploring the entire space of supported stream combinations. The available
     * mandatory stream combinations
     * {@link android.hardware.camera2.params.MandatoryStreamCombination} are better suited for this
     * purpose.</p>
     *
     * <p>Note that session parameters will be ignored and calls to
     * {@link SessionConfiguration#setSessionParameters} are not required.</p>
     *
     * @return {@code true} if the given session configuration is supported by the camera device
     *         {@code false} otherwise.
     * @throws UnsupportedOperationException if the query operation is not supported by the camera
     *                                       device
     * @throws IllegalArgumentException if the session configuration is invalid
     * @throws CameraAccessException if the camera device is no longer connected or has
     *                               encountered a fatal error
     * @throws IllegalStateException if the camera device has been closed
     */
    public boolean isSessionConfigurationSupported(
            @NonNull SessionConfiguration sessionConfig) throws CameraAccessException {
        throw new UnsupportedOperationException("Subclasses must override this method");
    }

    /**
     * A callback objects for receiving updates about the state of a camera device.
     *
     * <p>A callback instance must be provided to the {@link CameraManager#openCamera} method to
     * open a camera device.</p>
     *
     * <p>These state updates include notifications about the device completing startup (
     * allowing for {@link #createCaptureSession} to be called), about device
     * disconnection or closure, and about unexpected device errors.</p>
     *
     * <p>Events about the progress of specific {@link CaptureRequest CaptureRequests} are provided
     * through a {@link CameraCaptureSession.CaptureCallback} given to the
     * {@link CameraCaptureSession#capture}, {@link CameraCaptureSession#captureBurst},
     * {@link CameraCaptureSession#setRepeatingRequest}, or
     * {@link CameraCaptureSession#setRepeatingBurst} methods.
     *
     * @see CameraManager#openCamera
     */
    public static abstract class StateCallback {
       /**
         * An error code that can be reported by {@link #onError}
         * indicating that the camera device is in use already.
         *
         * <p>
         * This error can be produced when opening the camera fails due to the camera
        *  being used by a higher-priority camera API client.
         * </p>
         *
         * @see #onError
         */
        public static final int ERROR_CAMERA_IN_USE = 1;

        /**
         * An error code that can be reported by {@link #onError}
         * indicating that the camera device could not be opened
         * because there are too many other open camera devices.
         *
         * <p>
         * The system-wide limit for number of open cameras has been reached,
         * and more camera devices cannot be opened until previous instances are
         * closed.
         * </p>
         *
         * <p>
         * This error can be produced when opening the camera fails.
         * </p>
         *
         * @see #onError
         */
        public static final int ERROR_MAX_CAMERAS_IN_USE = 2;

        /**
         * An error code that can be reported by {@link #onError}
         * indicating that the camera device could not be opened due to a device
         * policy.
         *
         * @see android.app.admin.DevicePolicyManager#setCameraDisabled(android.content.ComponentName, boolean)
         * @see #onError
         */
        public static final int ERROR_CAMERA_DISABLED = 3;

       /**
         * An error code that can be reported by {@link #onError}
         * indicating that the camera device has encountered a fatal error.
         *
         * <p>The camera device needs to be re-opened to be used again.</p>
         *
         * @see #onError
         */
        public static final int ERROR_CAMERA_DEVICE = 4;

        /**
         * An error code that can be reported by {@link #onError}
         * indicating that the camera service has encountered a fatal error.
         *
         * <p>The Android device may need to be shut down and restarted to restore
         * camera function, or there may be a persistent hardware problem.</p>
         *
         * <p>An attempt at recovery <i>may</i> be possible by closing the
         * CameraDevice and the CameraManager, and trying to acquire all resources
         * again from scratch.</p>
         *
         * @see #onError
         */
        public static final int ERROR_CAMERA_SERVICE = 5;

        /** @hide */
        @Retention(RetentionPolicy.SOURCE)
        @IntDef(prefix = {"ERROR_"}, value =
            {ERROR_CAMERA_IN_USE,
             ERROR_MAX_CAMERAS_IN_USE,
             ERROR_CAMERA_DISABLED,
             ERROR_CAMERA_DEVICE,
             ERROR_CAMERA_SERVICE })
        public @interface ErrorCode {};

        /**
         * The method called when a camera device has finished opening.
         *
         * <p>At this point, the camera device is ready to use, and
         * {@link CameraDevice#createCaptureSession} can be called to set up the first capture
         * session.</p>
         *
         * @param camera the camera device that has become opened
         */
        public abstract void onOpened(@NonNull CameraDevice camera); // Must implement

        /**
         * The method called when a camera device has been closed with
         * {@link CameraDevice#close}.
         *
         * <p>Any attempt to call methods on this CameraDevice in the
         * future will throw a {@link IllegalStateException}.</p>
         *
         * <p>The default implementation of this method does nothing.</p>
         *
         * @param camera the camera device that has become closed
         */
        public void onClosed(@NonNull CameraDevice camera) {
            // Default empty implementation
        }

        /**
         * The method called when a camera device is no longer available for
         * use.
         *
         * <p>This callback may be called instead of {@link #onOpened}
         * if opening the camera fails.</p>
         *
         * <p>Any attempt to call methods on this CameraDevice will throw a
         * {@link CameraAccessException}. The disconnection could be due to a
         * change in security policy or permissions; the physical disconnection
         * of a removable camera device; or the camera being needed for a
         * higher-priority camera API client.</p>
         *
         * <p>There may still be capture callbacks that are invoked
         * after this method is called, or new image buffers that are delivered
         * to active outputs.</p>
         *
         * <p>The default implementation logs a notice to the system log
         * about the disconnection.</p>
         *
         * <p>You should clean up the camera with {@link CameraDevice#close} after
         * this happens, as it is not recoverable until the camera can be opened
         * again. For most use cases, this will be when the camera again becomes
         * {@link CameraManager.AvailabilityCallback#onCameraAvailable available}.
         * </p>
         *
         * @param camera the device that has been disconnected
         */
        public abstract void onDisconnected(@NonNull CameraDevice camera); // Must implement

        /**
         * The method called when a camera device has encountered a serious error.
         *
         * <p>This callback may be called instead of {@link #onOpened}
         * if opening the camera fails.</p>
         *
         * <p>This indicates a failure of the camera device or camera service in
         * some way. Any attempt to call methods on this CameraDevice in the
         * future will throw a {@link CameraAccessException} with the
         * {@link CameraAccessException#CAMERA_ERROR CAMERA_ERROR} reason.
         * </p>
         *
         * <p>There may still be capture completion or camera stream callbacks
         * that will be called after this error is received.</p>
         *
         * <p>You should clean up the camera with {@link CameraDevice#close} after
         * this happens. Further attempts at recovery are error-code specific.</p>
         *
         * @param camera The device reporting the error
         * @param error The error code.
         *
         * @see #ERROR_CAMERA_IN_USE
         * @see #ERROR_MAX_CAMERAS_IN_USE
         * @see #ERROR_CAMERA_DISABLED
         * @see #ERROR_CAMERA_DEVICE
         * @see #ERROR_CAMERA_SERVICE
         */
        public abstract void onError(@NonNull CameraDevice camera,
                @ErrorCode int error); // Must implement
    }

    /**
     * To be inherited by android.hardware.camera2.* code only.
     * @hide
     */
    public CameraDevice() {}
}