summaryrefslogtreecommitdiffstats
path: root/camera/CameraBase.cpp
blob: 04694cd71eb131633116bcb3f2a0750dad20cea8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/*
**
** Copyright (C) 2013, 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.
*/

//#define LOG_NDEBUG 0
#define LOG_TAG "CameraBase"
#include <utils/Log.h>
#include <utils/threads.h>
#include <utils/Mutex.h>

#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/IMemory.h>

#include <camera/CameraBase.h>
#include <camera/ICameraService.h>

// needed to instantiate
#include <camera/ProCamera.h>
#include <camera/Camera.h>

#include <system/camera_metadata.h>

namespace android {

namespace {
    sp<ICameraService>        gCameraService;
    const int                 kCameraServicePollDelay = 500000; // 0.5s
    const char*               kCameraServiceName      = "media.camera";

    Mutex                     gLock;

    class DeathNotifier : public IBinder::DeathRecipient
    {
    public:
        DeathNotifier() {
        }

        virtual void binderDied(const wp<IBinder>& /*who*/) {
            ALOGV("binderDied");
            Mutex::Autolock _l(gLock);
            gCameraService.clear();
            ALOGW("Camera service died!");
        }
    };

    sp<DeathNotifier>         gDeathNotifier;
}; // namespace anonymous

///////////////////////////////////////////////////////////
// CameraBase definition
///////////////////////////////////////////////////////////

// establish binder interface to camera service
template <typename TCam, typename TCamTraits>
const sp<ICameraService>& CameraBase<TCam, TCamTraits>::getCameraService()
{
    Mutex::Autolock _l(gLock);
    if (gCameraService.get() == 0) {
        sp<IServiceManager> sm = defaultServiceManager();
        sp<IBinder> binder;
        do {
            binder = sm->getService(String16(kCameraServiceName));
            if (binder != 0) {
                break;
            }
            ALOGW("CameraService not published, waiting...");
            usleep(kCameraServicePollDelay);
        } while(true);
        if (gDeathNotifier == NULL) {
            gDeathNotifier = new DeathNotifier();
        }
        binder->linkToDeath(gDeathNotifier);
        gCameraService = interface_cast<ICameraService>(binder);
    }
    ALOGE_IF(gCameraService == 0, "no CameraService!?");
    return gCameraService;
}

template <typename TCam, typename TCamTraits>
sp<TCam> CameraBase<TCam, TCamTraits>::connect(int cameraId,
                                               const String16& clientPackageName,
                                               int clientUid)
{
    ALOGV("%s: connect", __FUNCTION__);
    sp<TCam> c = new TCam(cameraId);
    sp<TCamCallbacks> cl = c;
    status_t status = NO_ERROR;
    const sp<ICameraService>& cs = getCameraService();

    if (cs != 0) {
        TCamConnectService fnConnectService = TCamTraits::fnConnectService;
        status = (cs.get()->*fnConnectService)(cl, cameraId, clientPackageName, clientUid,
                                             /*out*/ c->mCamera);
    }
    if (status == OK && c->mCamera != 0) {
        c->mCamera->asBinder()->linkToDeath(c);
        c->mStatus = NO_ERROR;
    } else {
        ALOGW("An error occurred while connecting to camera: %d", cameraId);
        c.clear();
    }
    return c;
}

template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::disconnect()
{
    ALOGV("%s: disconnect", __FUNCTION__);
    if (mCamera != 0) {
        mCamera->disconnect();
        mCamera->asBinder()->unlinkToDeath(this);
        mCamera = 0;
    }
    ALOGV("%s: disconnect (done)", __FUNCTION__);
}

template <typename TCam, typename TCamTraits>
CameraBase<TCam, TCamTraits>::CameraBase(int cameraId) :
    mStatus(UNKNOWN_ERROR),
    mCameraId(cameraId)
{
}

template <typename TCam, typename TCamTraits>
CameraBase<TCam, TCamTraits>::~CameraBase()
{
}

template <typename TCam, typename TCamTraits>
sp<typename TCamTraits::TCamUser> CameraBase<TCam, TCamTraits>::remote()
{
    return mCamera;
}

template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::getStatus()
{
    return mStatus;
}

template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::binderDied(const wp<IBinder>& /*who*/) {
    ALOGW("mediaserver's remote binder Camera object died");
    notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, /*ext2*/0);
}

template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::setListener(const sp<TCamListener>& listener)
{
    Mutex::Autolock _l(mLock);
    mListener = listener;
}

// callback from camera service
template <typename TCam, typename TCamTraits>
void CameraBase<TCam, TCamTraits>::notifyCallback(int32_t msgType,
                                                  int32_t ext1,
                                                  int32_t ext2)
{
    sp<TCamListener> listener;
    {
        Mutex::Autolock _l(mLock);
        listener = mListener;
    }
    if (listener != NULL) {
        listener->notify(msgType, ext1, ext2);
    }
}

template <typename TCam, typename TCamTraits>
int CameraBase<TCam, TCamTraits>::getNumberOfCameras() {
    const sp<ICameraService> cs = getCameraService();

    if (!cs.get()) {
        // as required by the public Java APIs
        return 0;
    }
    return cs->getNumberOfCameras();
}

// this can be in BaseCamera but it should be an instance method
template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::getCameraInfo(int cameraId,
                               struct CameraInfo* cameraInfo) {
    const sp<ICameraService>& cs = getCameraService();
    if (cs == 0) return UNKNOWN_ERROR;
    return cs->getCameraInfo(cameraId, cameraInfo);
}

template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::addServiceListener(
                            const sp<ICameraServiceListener>& listener) {
    const sp<ICameraService>& cs = getCameraService();
    if (cs == 0) return UNKNOWN_ERROR;
    return cs->addListener(listener);
}

template <typename TCam, typename TCamTraits>
status_t CameraBase<TCam, TCamTraits>::removeServiceListener(
                            const sp<ICameraServiceListener>& listener) {
    const sp<ICameraService>& cs = getCameraService();
    if (cs == 0) return UNKNOWN_ERROR;
    return cs->removeListener(listener);
}

template class CameraBase<ProCamera>;
template class CameraBase<Camera>;

} // namespace android