summaryrefslogtreecommitdiffstats
path: root/camera/libcameraservice/CameraService.h
blob: cd8c1e9a41cfa80bfe53ce715df582706071dc39 (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
/*
**
** Copyright (C) 2008, The Android Open Source Project
** Copyright (C) 2008 HTC Inc.
**
** 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.
*/

#ifndef ANDROID_SERVERS_CAMERA_CAMERASERVICE_H
#define ANDROID_SERVERS_CAMERA_CAMERASERVICE_H

#include <ui/ICameraService.h>
#include <ui/CameraHardwareInterface.h>
#include <ui/Camera.h>

class android::MemoryHeapBase;

namespace android {

// ----------------------------------------------------------------------------

#define LIKELY( exp )       (__builtin_expect( (exp) != 0, true  ))
#define UNLIKELY( exp )     (__builtin_expect( (exp) != 0, false ))

// When enabled, this feature allows you to send an event to the CameraService
// so that you can cause all references to the heap object gWeakHeap, defined
// below, to be printed. You will also need to set DEBUG_REFS=1 and
// DEBUG_REFS_ENABLED_BY_DEFAULT=0 in libutils/RefBase.cpp. You just have to
// set gWeakHeap to the appropriate heap you want to track.

#define DEBUG_HEAP_LEAKS 0

// ----------------------------------------------------------------------------

class CameraService : public BnCameraService
{
    class Client;

public:
    static void instantiate();

    // ICameraService interface
    virtual sp<ICamera>     connect(const sp<ICameraClient>& cameraClient);

    virtual status_t        dump(int fd, const Vector<String16>& args);

            void            removeClient(const sp<ICameraClient>& cameraClient);

#if DEBUG_HEAP_LEAKS
    virtual status_t onTransact(
        uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
#endif

private:

// ----------------------------------------------------------------------------

    class Client : public BnCamera {

    public:
        virtual void            disconnect();

        // connect new client with existing camera remote
        virtual status_t        connect(const sp<ICameraClient>& client);

        // prevent other processes from using this ICamera interface
        virtual status_t        lock();

        // allow other processes to use this ICamera interface
        virtual status_t        unlock();

        // pass the buffered ISurface to the camera service
        virtual status_t        setPreviewDisplay(const sp<ISurface>& surface);

        // set the frame callback flag to affect how the received frames from
        // preview are handled.
        virtual void            setFrameCallbackFlag(int frame_callback_flag);

        // start preview mode, must call setPreviewDisplay first
        virtual status_t        startPreview();

        // stop preview mode
        virtual void            stopPreview();

        // get preview state
        virtual bool            previewEnabled();

        // auto focus
        virtual status_t        autoFocus();

        // take a picture - returns an IMemory (ref-counted mmap)
        virtual status_t        takePicture();

        // set preview/capture parameters - key/value pairs
        virtual status_t        setParameters(const String8& params);

        // get preview/capture parameters - key/value pairs
        virtual String8         getParameters() const;

        // our client...
        const sp<ICameraClient>&    getCameraClient() const { return mCameraClient; }

    private:
        friend class CameraService;
                                Client(const sp<CameraService>& cameraService,
                                        const sp<ICameraClient>& cameraClient,
                                        pid_t clientPid);
                                Client();
        virtual                 ~Client();

                    status_t    checkPid();

        static      void        previewCallback(const sp<IMemory>& mem, void* user);
        static      void        shutterCallback(void *user);
        static      void        yuvPictureCallback(const sp<IMemory>& mem, void* user);
        static      void        jpegPictureCallback(const sp<IMemory>& mem, void* user);
        static      void        autoFocusCallback(bool focused, void* user);
        static      sp<Client>  getClientFromCookie(void* user);

                    void        postShutter();
                    void        postRaw(const sp<IMemory>& mem);
                    void        postJpeg(const sp<IMemory>& mem);
                    void        postFrame(const sp<IMemory>& mem);
                    void        copyFrameAndPostCopiedFrame(sp<IMemoryHeap> heap, size_t offset, size_t size);
                    void        postError(status_t error);
                    void        postAutoFocus(bool focused);

                    // Ensures atomicity among the public methods
        mutable     Mutex                       mLock;
        // mSurfaceLock synchronizes access to mSurface between
        // setPreviewSurface() and postFrame().  Note that among
        // the public methods, all accesses to mSurface are
        // syncrhonized by mLock.  However, postFrame() is called
        // by the CameraHardwareInterface callback, and needs to
        // access mSurface.  It cannot hold mLock, however, because
        // stopPreview() may be holding that lock while attempting
        // to stop preview, and stopPreview itself will block waiting
        // for a callback from CameraHardwareInterface.  If this
        // happens, it will cause a deadlock.
        mutable     Mutex                       mSurfaceLock;
        mutable     Condition                   mReady;
                    sp<CameraService>           mCameraService;
                    sp<ISurface>                mSurface;
                    sp<MemoryHeapBase>          mPreviewBuffer;
                    int                         mFrameCallbackFlag;

                    // these are immutable once the object is created,
                    // they don't need to be protected by a lock
                    sp<ICameraClient>           mCameraClient;
                    sp<CameraHardwareInterface> mHardware;
                    pid_t                       mClientPid;
    };

// ----------------------------------------------------------------------------

                            CameraService();
    virtual                 ~CameraService();

    mutable     Mutex                       mLock;
                wp<Client>                  mClient;

#if DEBUG_HEAP_LEAKS
                wp<IMemoryHeap>             gWeakHeap;
#endif
};

// ----------------------------------------------------------------------------

}; // namespace android

#endif