path: root/camera/device/3.4/types.hal

/*
 * Copyright (C) 2017 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.camera.device@3.4;

import @3.2::RequestTemplate;
import @3.2::StreamConfigurationMode;
import @3.2::Stream;
import @3.3::HalStream;
import @3.2::CameraMetadata;
import @3.2::CaptureRequest;
import @3.2::CaptureResult;

/**
 * Stream:
 *
 * A descriptor for a single camera input or output stream. A stream is defined
 * by the framework by its buffer resolution and format, and additionally by the
 * HAL with the gralloc usage flags and the maximum in-flight buffer count.
 *
 * This version extends the @3.2 Stream with the physicalCameraId field.
 */
struct Stream {
    /**
     * The definition of Stream from the prior version
     */
    @3.2::Stream v3_2;

    /**
     * The physical camera id this stream belongs to.
     *
     * If the camera device is not a logical multi camera, or if the camera is a logical
     * multi camera but the stream is not a physical output stream, this field will point to a
     * 0-length string.
     *
     * A logical multi camera is a camera device backed by multiple physical cameras that
     * are also exposed to the application. And for a logical multi camera, a physical output
     * stream is an output stream specifically requested on an underlying physical camera.
     *
     * A logical camera is a camera device backed by multiple physical camera
     * devices. And a physical stream is a stream specifically requested on a
     * underlying physical camera device.
     *
     * For an input stream, this field is guaranteed to be a 0-length string.
     *
     * When not empty, this field is the <id> field of one of the full-qualified device
     * instance names returned by getCameraIdList().
     */
    string physicalCameraId;
};

/**
 * New request templates, extending the @3.2 RequestTemplate
 */
enum RequestTemplate : @3.2::RequestTemplate {
    /**
     * A template for selecting camera parameters that match TEMPLATE_PREVIEW as closely as
     * possible while improving the camera output for motion tracking use cases.
     *
     * This template is best used by applications that are frequently switching between motion
     * tracking use cases and regular still capture use cases, to minimize the IQ changes
     * when swapping use cases.
     *
     * This template is guaranteed to be supported on camera devices that support the
     * REQUEST_AVAILABLE_CAPABILITIES_MOTION_TRACKING capability.
     */
    MOTION_TRACKING_PREVIEW = 7,

    /**
     * A template for selecting camera parameters that maximize the quality of camera output for
     * motion tracking use cases.
     *
     * This template is best used by applications dedicated to motion tracking applications,
     * which aren't concerned about fast switches between motion tracking and other use cases.
     *
     * This template is guaranteed to be supported on camera devices that support the
     * REQUEST_AVAILABLE_CAPABILITIES_MOTION_TRACKING capability.
     */
    MOTION_TRACKING_BEST = 8,
};

/**
 * StreamConfiguration:
 *
 * Identical to @3.2::StreamConfiguration, except that it contains session
 * parameters, and the streams vector contains @3.4::Stream.
 */
struct StreamConfiguration {
    /**
     * An array of camera stream pointers, defining the input/output
     * configuration for the camera HAL device.
     */
    vec<Stream> streams;

    /**
     * The definition of operation mode from prior version.
     *
     */
    StreamConfigurationMode operationMode;

    /**
     * Session wide camera parameters.
     *
     * The session parameters contain the initial values of any request keys that were
     * made available via ANDROID_REQUEST_AVAILABLE_SESSION_KEYS. The Hal implementation
     * can advertise any settings that can potentially introduce unexpected delays when
     * their value changes during active process requests. Typical examples are
     * parameters that trigger time-consuming HW re-configurations or internal camera
     * pipeline updates. The field is optional, clients can choose to ignore it and avoid
     * including any initial settings. If parameters are present, then hal must examine
     * their values and configure the internal camera pipeline accordingly.
     */
    CameraMetadata sessionParams;
};

/**
 * HalStream:
 *
 * The camera HAL's response to each requested stream configuration.
 *
 * This version extends the @3.3 HalStream with the physicalCameraId
 * field
 */
struct HalStream {
    /**
     * The definition of HalStream from the prior version.
     */
    @3.3::HalStream v3_3;

    /**
     * The physical camera id the current Hal stream belongs to.
     *
     * If current camera device isn't a logical camera, or the Hal stream isn't
     * from a physical camera of the logical camera, this must be an empty
     * string.
     *
     * A logical camera is a camera device backed by multiple physical camera
     * devices.
     *
     * When not empty, this field is the <id> field of one of the full-qualified device
     * instance names returned by getCameraIdList().
     */
    string physicalCameraId;
};

/**
 * HalStreamConfiguration:
 *
 * Identical to @3.3::HalStreamConfiguration, except that it contains @3.4::HalStream entries.
 *
 */
struct HalStreamConfiguration {
    vec<HalStream> streams;
};

/**
 * PhysicalCameraSetting:
 *
 * Individual camera settings for logical camera backed by multiple physical devices.
 * Clients are allowed to pass separate settings for each physical device.
 */
struct PhysicalCameraSetting {
    /**
     * If non-zero, read settings from request queue instead
     * (see ICameraDeviceSession.getCaptureRequestMetadataQueue).
     * If zero, read settings from .settings field.
     */
    uint64_t fmqSettingsSize;

    /**
     * Contains the physical device camera id. Any settings passed by client here
     * should be applied for this physical device. In case the physical id is invalid
     * Hal should fail the process request and return Status::ILLEGAL_ARGUMENT.
     */
    string physicalCameraId;

    /**
     * If fmqSettingsSize is zero, the settings buffer contains the capture and
     * processing parameters for the physical device with id 'phyCamId'.
     * In case the individual settings are empty or missing, Hal should fail the
     * request and return Status::ILLEGAL_ARGUMENT.
     */
    CameraMetadata settings;
};

/**
 * CaptureRequest:
 *
 * A single request for image capture/buffer reprocessing, sent to the Camera
 * HAL device by the framework in processCaptureRequest().
 *
 * The request contains the settings to be used for this capture, and the set of
 * output buffers to write the resulting image data in. It may optionally
 * contain an input buffer, in which case the request is for reprocessing that
 * input buffer instead of capturing a new image with the camera sensor. The
 * capture is identified by the frameNumber.
 *
 * In response, the camera HAL device must send a CaptureResult
 * structure asynchronously to the framework, using the processCaptureResult()
 * callback.
 *
 * Identical to @3.2::CaptureRequest, except that it contains @3.4::physCamSettings vector.
 *
 */
struct CaptureRequest {
    /**
     * The definition of CaptureRequest from prior version.
     */
    @3.2::CaptureRequest v3_2;

    /**
     * A vector containing individual camera settings for logical camera backed by multiple physical
     * devices. In case the vector is empty, Hal should use the settings field in 'v3_2'.
     */
    vec<PhysicalCameraSetting> physicalCameraSettings;
};

/**
 * PhysicalCameraMetadata:
 *
 * Individual camera metadata for a physical camera as part of a logical
 * multi-camera. Camera HAL should return one such metadata for each physical
 * camera being requested on.
 */
struct PhysicalCameraMetadata {
    /**
     * If non-zero, read metadata from result metadata queue instead
     * (see ICameraDeviceSession.getCaptureResultMetadataQueue).
     * If zero, read metadata from .metadata field.
     */
    uint64_t fmqMetadataSize;

    /**
     * Contains the physical device camera id. As long as the corresponding
     * processCaptureRequest requests on a particular physical camera stream,
     * the metadata for that physical camera should be generated for the capture
     * result. */
    string physicalCameraId;

    /**
     * If fmqMetadataSize is zero, the metadata buffer contains the metadata
     * for the physical device with physicalCameraId.
     *
     * The v3_2 CaptureResult metadata is read first from the FMQ, followed by
     * the physical cameras' metadata starting from index 0.
     */
    CameraMetadata metadata;
};

/**
 * CaptureResult:
 *
 * Identical to @3.2::CaptureResult, except that it contains a list of
 * physical camera metadata.
 *
 * Physical camera metadata needs to be generated if and only if a
 * request is pending on a stream from that physical camera. For example,
 * if the processCaptureRequest call doesn't request on physical camera
 * streams, the physicalCameraMetadata field of the CaptureResult being returned
 * should be an 0-size vector. If the processCaptureRequest call requests on
 * streams from one of the physical camera, the physicalCameraMetadata field
 * should contain one metadata describing the capture from that physical camera.
 *
 * For a CaptureResult that contains physical camera metadata, its
 * partialResult field must be android.request.partialResultCount. In other
 * words, the physicalCameraMetadata must only be contained in a final capture
 * result.
 */
struct CaptureResult {
    /**
     * The definition of CaptureResult from the prior version.
     */
    @3.2::CaptureResult v3_2;

    /**
     * The physical metadata for logical multi-camera.
     */
    vec<PhysicalCameraMetadata> physicalCameraMetadata;
};