1 /*
2  * Copyright (C) 2015 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 #ifndef ANDROID_SERVERS_CAMERA_CAMERAMODULE_H
18 #define ANDROID_SERVERS_CAMERA_CAMERAMODULE_H
19 
20 #include <hardware/camera.h>
21 #include <camera/CameraMetadata.h>
22 #include <utils/Mutex.h>
23 #include <utils/KeyedVector.h>
24 
25 namespace android {
26 /**
27  * A wrapper class for HAL camera module.
28  *
29  * This class wraps camera_module_t returned from HAL to provide a wrapped
30  * get_camera_info implementation which CameraService generates some
31  * camera characteristics keys defined in newer HAL version on an older HAL.
32  */
33 class CameraModule {
34 public:
35     CameraModule(camera_module_t *module);
36     virtual ~CameraModule();
37 
38     // Must be called after construction
39     // Returns OK on success, NO_INIT on failure
40     int init();
41 
42     int getCameraInfo(int cameraId, struct camera_info *info);
43     int getNumberOfCameras(void);
44     int open(const char* id, struct hw_device_t** device);
45     int openLegacy(const char* id, uint32_t halVersion, struct hw_device_t** device);
46     int setCallbacks(const camera_module_callbacks_t *callbacks);
47     bool isVendorTagDefined();
48     void getVendorTagOps(vendor_tag_ops_t* ops);
49     int setTorchMode(const char* camera_id, bool enable);
50     uint16_t getModuleApiVersion();
51     const char* getModuleName();
52     uint16_t getHalApiVersion();
53     const char* getModuleAuthor();
54     // Only used by CameraModuleFixture native test. Do NOT use elsewhere.
55     void *getDso();
56 
57 private:
58     // Derive camera characteristics keys defined after HAL device version
59     static void deriveCameraCharacteristicsKeys(uint32_t deviceVersion, CameraMetadata &chars);
60     // Helper function to append available[request|result|chars]Keys
61     static void appendAvailableKeys(CameraMetadata &chars,
62             int32_t keyTag, const Vector<int32_t>& appendKeys);
63     status_t filterOpenErrorCode(status_t err);
64     camera_module_t *mModule;
65     KeyedVector<int, camera_info> mCameraInfoMap;
66     Mutex mCameraInfoLock;
67 };
68 
69 } // namespace android
70 
71 #endif
72