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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera.app;
     18 
     19 import com.android.camera.device.CameraId;
     20 import com.android.ex.camera2.portability.CameraDeviceInfo.Characteristics;
     21 import com.android.ex.camera2.portability.CameraExceptionHandler;
     22 
     23 /**
     24  * An interface which defines the camera provider.
     25  */
     26 public interface CameraProvider {
     27 
     28     /**
     29      * Requests the camera device. If the camera device of the same ID is
     30      * already requested, then no-op here.
     31      *
     32      * @param id The ID of the requested camera device.
     33      */
     34     public void requestCamera(int id);
     35 
     36     /**
     37      * Requests the camera device. If the camera device of the same ID is
     38      * already requested, then no-op here.
     39      *
     40      * @param id The ID of the requested camera device.
     41      * @param useNewApi Whether to use the new API if this platform provides it.
     42      */
     43     public void requestCamera(int id, boolean useNewApi);
     44 
     45     public boolean waitingForCamera();
     46 
     47     /**
     48      * Releases the camera device.
     49      *
     50      * @param id The camera ID.
     51      */
     52     public void releaseCamera(int id);
     53 
     54     /**
     55      * Sets a callback for handling camera api runtime exceptions on
     56      * a handler.
     57      */
     58     public void setCameraExceptionHandler(CameraExceptionHandler exceptionHandler);
     59 
     60     /**
     61      * Get the {@link Characteristics} of the given camera.
     62      *
     63      * @param cameraId Which camera.
     64      * @return The static characteristics of that camera.
     65      */
     66     public Characteristics getCharacteristics(int cameraId);
     67 
     68     /**
     69      * @returns The current camera id.
     70      */
     71     public CameraId getCurrentCameraId();
     72 
     73     /**
     74      * Returns the total number of cameras available on the device.
     75      */
     76     public int getNumberOfCameras();
     77 
     78     /**
     79      * @returns The lowest ID of the back camera or -1 if not available.
     80      */
     81     public int getFirstBackCameraId();
     82 
     83     /**
     84      * @return The lowest ID of the front camera or -1 if not available.
     85      */
     86     public int getFirstFrontCameraId();
     87 
     88     /**
     89      * @returns Whether the camera is facing front.
     90      */
     91     public boolean isFrontFacingCamera(int id);
     92 
     93     /**
     94      * @returns Whether the camera is facing back.
     95      */
     96     public boolean isBackFacingCamera(int id);
     97 }
     98