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94 lines
3.3 KiB
94 lines
3.3 KiB
4 months ago
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.hardware.automotive.evs@1.0;
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import IEvsCamera;
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import IEvsDisplay;
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/**
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* Provides the mechanism for EVS camera discovery
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*/
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interface IEvsEnumerator {
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/**
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* Returns a list of all EVS cameras available to the system
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*
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* @return cameras A list of cameras availale for EVS service.
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*/
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getCameraList() generates (vec<CameraDesc> cameras);
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/**
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* Get the IEvsCamera associated with a cameraId from a CameraDesc
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*
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* Given a camera's unique cameraId from CameraDesc, returns the
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* IEvsCamera interface associated with the specified camera. When
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* done using the camera, the caller may release it by calling closeCamera().
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*
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* @param cameraId A unique identifier of the camera.
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* @return carCamera EvsCamera object associated with a given cameraId.
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*/
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openCamera(string cameraId) generates (IEvsCamera carCamera);
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/**
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* Return the specified IEvsCamera interface as no longer in use
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*
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* When the IEvsCamera object is no longer required, it must be released.
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* NOTE: Video streaming must be cleanly stopped before making this call.
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*
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* @param carCamera EvsCamera object to be closed.
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*/
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closeCamera(IEvsCamera carCamera);
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/**
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* Get exclusive access to IEvsDisplay for the system
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*
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* There can be at most one EVS display object for the system and this function
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* requests access to it. If the EVS display is not available or is already in use,
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* the old instance shall be closed and give the new caller exclusive
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* access.
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* When done using the display, the caller may release it by calling closeDisplay().
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*
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* @return display EvsDisplay object to be used.
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*/
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openDisplay() generates (IEvsDisplay display);
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/**
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* Return the specified IEvsDisplay interface as no longer in use
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*
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* When the IEvsDisplay object is no longer required, it must be released.
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* NOTE: All buffers must have been returned to the display before making this call.
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*
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* @param display EvsDisplay object to be closed.
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*/
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closeDisplay(IEvsDisplay display);
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/**
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* This call requests the current state of the display
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*
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* If there is no open display, this returns DisplayState::NOT_OPEN. otherwise, it returns
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* the actual state of the active display. This call is replicated on the IEvsEnumerator
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* interface in order to allow secondary clients to monitor the state of the EVS display
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* without acquiring exclusive ownership of the display.
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*
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* @return state Current DisplayState of this Display.
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*/
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getDisplayState() generates (DisplayState state);
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};
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