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 _ACAMERA_MANAGER_H
18#define _ACAMERA_MANAGER_H
19
20#include "NdkCameraManager.h"
21
22#include <android/hardware/ICameraService.h>
23#include <android/hardware/BnCameraServiceListener.h>
24#include <camera/CameraMetadata.h>
25#include <binder/IServiceManager.h>
26#include <utils/StrongPointer.h>
27#include <utils/Mutex.h>
28
29#include <media/stagefright/foundation/ALooper.h>
30#include <media/stagefright/foundation/AHandler.h>
31#include <media/stagefright/foundation/AMessage.h>
32
33#include <set>
34#include <map>
35
36namespace android {
37
38/**
39 * Per-process singleton instance of CameraManger. Shared by all ACameraManager
40 * instances. Created when first ACameraManager is created and destroyed when
41 * all ACameraManager instances are deleted.
42 *
43 * TODO: maybe CameraManagerGlobal is better suited in libcameraclient?
44 */
45class CameraManagerGlobal final : public RefBase {
46  public:
47    static CameraManagerGlobal& getInstance();
48    sp<hardware::ICameraService> getCameraService();
49
50    void registerAvailabilityCallback(
51            const ACameraManager_AvailabilityCallbacks *callback);
52    void unregisterAvailabilityCallback(
53            const ACameraManager_AvailabilityCallbacks *callback);
54
55    /**
56     * Return camera IDs that support camera2
57     */
58    void getCameraIdList(std::vector<String8> *cameraIds);
59
60  private:
61    sp<hardware::ICameraService> mCameraService;
62    const int          kCameraServicePollDelay = 500000; // 0.5s
63    const char*        kCameraServiceName      = "media.camera";
64    Mutex              mLock;
65
66    class DeathNotifier : public IBinder::DeathRecipient {
67      public:
68        explicit DeathNotifier(CameraManagerGlobal* cm) : mCameraManager(cm) {}
69      protected:
70        // IBinder::DeathRecipient implementation
71        virtual void binderDied(const wp<IBinder>& who);
72      private:
73        const wp<CameraManagerGlobal> mCameraManager;
74    };
75    sp<DeathNotifier> mDeathNotifier;
76
77    class CameraServiceListener final : public hardware::BnCameraServiceListener {
78      public:
79        explicit CameraServiceListener(CameraManagerGlobal* cm) : mCameraManager(cm) {}
80        virtual binder::Status onStatusChanged(int32_t status, const String16& cameraId);
81
82        // Torch API not implemented yet
83        virtual binder::Status onTorchStatusChanged(int32_t, const String16&) {
84            return binder::Status::ok();
85        }
86
87      private:
88        const wp<CameraManagerGlobal> mCameraManager;
89    };
90    sp<CameraServiceListener> mCameraServiceListener;
91
92    // Wrapper of ACameraManager_AvailabilityCallbacks so we can store it in std::set
93    struct Callback {
94        explicit Callback(const ACameraManager_AvailabilityCallbacks *callback) :
95            mAvailable(callback->onCameraAvailable),
96            mUnavailable(callback->onCameraUnavailable),
97            mContext(callback->context) {}
98
99        bool operator == (const Callback& other) const {
100            return (mAvailable == other.mAvailable &&
101                    mUnavailable == other.mUnavailable &&
102                    mContext == other.mContext);
103        }
104        bool operator != (const Callback& other) const {
105            return !(*this == other);
106        }
107        bool operator < (const Callback& other) const {
108            if (*this == other) return false;
109            if (mContext != other.mContext) return mContext < other.mContext;
110            if (mAvailable != other.mAvailable) return mAvailable < other.mAvailable;
111            return mUnavailable < other.mUnavailable;
112        }
113        bool operator > (const Callback& other) const {
114            return (*this != other && !(*this < other));
115        }
116        ACameraManager_AvailabilityCallback mAvailable;
117        ACameraManager_AvailabilityCallback mUnavailable;
118        void*                               mContext;
119    };
120    std::set<Callback> mCallbacks;
121
122    // definition of handler and message
123    enum {
124        kWhatSendSingleCallback
125    };
126    static const char* kCameraIdKey;
127    static const char* kCallbackFpKey;
128    static const char* kContextKey;
129    class CallbackHandler : public AHandler {
130      public:
131        CallbackHandler() {}
132        void onMessageReceived(const sp<AMessage> &msg) override;
133    };
134    sp<CallbackHandler> mHandler;
135    sp<ALooper>         mCbLooper; // Looper thread where callbacks actually happen on
136
137    void onStatusChanged(int32_t status, const String8& cameraId);
138    void onStatusChangedLocked(int32_t status, const String8& cameraId);
139    // Utils for status
140    static bool validStatus(int32_t status);
141    static bool isStatusAvailable(int32_t status);
142
143    // Map camera_id -> status
144    std::map<String8, int32_t> mDeviceStatusMap;
145
146    // For the singleton instance
147    static Mutex sLock;
148    static CameraManagerGlobal* sInstance;
149    CameraManagerGlobal() {};
150    ~CameraManagerGlobal();
151};
152
153} // namespace android;
154
155/**
156 * ACameraManager opaque struct definition
157 * Leave outside of android namespace because it's NDK struct
158 */
159struct ACameraManager {
160    ACameraManager() :
161            mGlobalManager(&(android::CameraManagerGlobal::getInstance())) {}
162    ~ACameraManager();
163    camera_status_t getCameraIdList(ACameraIdList** cameraIdList);
164    static void     deleteCameraIdList(ACameraIdList* cameraIdList);
165
166    camera_status_t getCameraCharacteristics(
167            const char *cameraId, ACameraMetadata **characteristics);
168    camera_status_t openCamera(const char* cameraId,
169                               ACameraDevice_StateCallbacks* callback,
170                               /*out*/ACameraDevice** device);
171
172  private:
173    enum {
174        kCameraIdListNotInit = -1
175    };
176    android::Mutex         mLock;
177    android::sp<android::CameraManagerGlobal> mGlobalManager;
178};
179
180#endif //_ACAMERA_MANAGER_H
181