xref: /aosp_15_r20/hardware/interfaces/automotive/evs/1.1/IEvsEnumerator.hal (revision 4d7e907c777eeecc4c5bd7cf640a754fac206ff7)

/*
 * Copyright (C) 2019 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 [email protected];

import IEvsCamera;
import IEvsDisplay;
import IEvsUltrasonicsArray;
import @1.0::IEvsEnumerator;
import @1.0::EvsResult;
import [email protected]::Stream;

/**
 * Provides the mechanism for EVS camera and ultrasonics array discovery
 */
interface IEvsEnumerator extends @1.0::IEvsEnumerator {
    /**
     * Returns a list of all EVS cameras available to the system
     *
     * @return cameras A list of cameras availale for EVS service.
     */
    getCameraList_1_1() generates (vec<CameraDesc> cameras);

    /**
     * Gets the IEvsCamera associated with a cameraId from a CameraDesc
     *
     * Given a camera's unique cameraId from CameraDesc, returns the
     * IEvsCamera interface associated with the specified camera. When
     * done using the camera, the caller may release it by calling closeCamera().
     *
     * @param  cameraId  A unique identifier of the camera.
     * @param  streamCfg A stream configuration the client wants to use.
     * @return evsCamera EvsCamera object associated with a given cameraId.
     *                   Returned object would be null if a camera device does
     *                   not support a given stream configuration or is already
     *                   configured differently by another client.
     */
    openCamera_1_1(string cameraId, Stream streamCfg) generates (IEvsCamera evsCamera);

    /**
     * Tells whether this is EVS manager or HAL implementation.
     *
     * @return result False for EVS manager implementations and true for all others.
     */
    isHardware() generates (bool result);

    /**
     * Returns a list of all EVS displays available to the system
     *
     * @return displayIds Identifiers of available displays.
     */
    getDisplayIdList() generates (vec<uint8_t> displayIds);

    /**
     * Get exclusive access to IEvsDisplay for the system
     *
     * There can be more than one EVS display objects for the system and this function
     * requests access to the display identified by a given ID. If the target EVS display
     * is not available or is already in use the old instance shall be closed and give
     * the new caller exclusive access.
     * When done using the display, the caller may release it by calling closeDisplay().
     *
     * @param  id      Target display identifier.
     * @return display EvsDisplay object to be used.
     */
    openDisplay_1_1(uint8_t id) generates (IEvsDisplay display);

    /**
     * Returns a list of all ultrasonics array available to the system.
     * Will return an empty vector if ultrasonics is not supported.
     *
     * @return ultrasonicsArrays A list of ultrasonics available for EVS service.
     */
    getUltrasonicsArrayList() generates (vec<UltrasonicsArrayDesc> ultrasonicsArrays);

    /**
     * Gets the IEvsUltrasonicsArray associated with a ultrasonicsArrayId from a
     * UltrasonicsDataDesc
     *
     * @param  ultrasonicsArrayId  A unique identifier of the ultrasonic array.
     * @return evsUltrasonicsArray IEvsUltrasonicsArray object associated with a
     *                             given ultrasonicsArrayId.
     */
    openUltrasonicsArray(string ultrasonicsArrayId) generates (
            IEvsUltrasonicsArray evsUltrasonicsArray);

    /**
     * Return the specified IEvsUltrasonicsArray interface as no longer in use
     *
     * When the IEvsUltrasonicsArray object is no longer required, it must be released.
     * NOTE: Data streaming must be cleanly stopped before making this call.
     *
     * @param  evsUltrasonicsArray EvsUltrasonics array object to be closed.
     */
    closeUltrasonicsArray(IEvsUltrasonicsArray evsUltrasonicsArray);
};