Camera.h revision 35a055b8bfc6f3cbea409b2897caf936654519cb 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * Copyright (C) 2008 HTC Inc.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#ifndef ANDROID_HARDWARE_CAMERA_H
19#define ANDROID_HARDWARE_CAMERA_H
20
21#include <utils/Timers.h>
22#include <camera/ICameraClient.h>
23
24namespace android {
25
26class ISurface;
27
28/*
29 * A set of bit masks for specifying how the received preview frames are
30 * handled before the previewCallback() call.
31 *
32 * The least significant 3 bits of an "int" value are used for this purpose:
33 *
34 * ..... 0 0 0
35 *       ^ ^ ^
36 *       | | |---------> determine whether the callback is enabled or not
37 *       | |-----------> determine whether the callback is one-shot or not
38 *       |-------------> determine whether the frame is copied out or not
39 *
40 * WARNING:
41 * When a frame is sent directly without copying, it is the frame receiver's
42 * responsiblity to make sure that the frame data won't get corrupted by
43 * subsequent preview frames filled by the camera. This flag is recommended
44 * only when copying out data brings significant performance price and the
45 * handling/processing of the received frame data is always faster than
46 * the preview frame rate so that data corruption won't occur.
47 *
48 * For instance,
49 * 1. 0x00 disables the callback. In this case, copy out and one shot bits
50 *    are ignored.
51 * 2. 0x01 enables a callback without copying out the received frames. A
52 *    typical use case is the Camcorder application to avoid making costly
53 *    frame copies.
54 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical
55 *    use case is the Camera application.
56 * 4. 0x07 is enabling a callback with frame copied out only once. A typical use
57 *    case is the Barcode scanner application.
58 */
59#define FRAME_CALLBACK_FLAG_ENABLE_MASK              0x01
60#define FRAME_CALLBACK_FLAG_ONE_SHOT_MASK            0x02
61#define FRAME_CALLBACK_FLAG_COPY_OUT_MASK            0x04
62
63// Typical use cases
64#define FRAME_CALLBACK_FLAG_NOOP                     0x00
65#define FRAME_CALLBACK_FLAG_CAMCORDER                0x01
66#define FRAME_CALLBACK_FLAG_CAMERA                   0x05
67#define FRAME_CALLBACK_FLAG_BARCODE_SCANNER          0x07
68
69// msgType in notifyCallback and dataCallback functions
70enum {
71    CAMERA_MSG_ERROR            = 0x001,
72    CAMERA_MSG_SHUTTER          = 0x002,
73    CAMERA_MSG_FOCUS            = 0x004,
74    CAMERA_MSG_ZOOM             = 0x008,
75    CAMERA_MSG_PREVIEW_FRAME    = 0x010,
76    CAMERA_MSG_VIDEO_FRAME      = 0x020,
77    CAMERA_MSG_POSTVIEW_FRAME   = 0x040,
78    CAMERA_MSG_RAW_IMAGE        = 0x080,
79    CAMERA_MSG_COMPRESSED_IMAGE = 0x100,
80    CAMERA_MSG_ALL_MSGS         = 0x1FF
81};
82
83// cmdType in sendCommand functions
84enum {
85    CAMERA_CMD_START_SMOOTH_ZOOM     = 1,
86    CAMERA_CMD_STOP_SMOOTH_ZOOM      = 2,
87    CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3,
88};
89
90// camera fatal errors
91enum {
92    CAMERA_ERROR_UKNOWN  = 1,
93    CAMERA_ERROR_SERVER_DIED = 100
94};
95
96class ICameraService;
97class ICamera;
98class Surface;
99class Mutex;
100class String8;
101
102// ref-counted object for callbacks
103class CameraListener: virtual public RefBase
104{
105public:
106    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0;
107    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr) = 0;
108    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) = 0;
109};
110
111class Camera : public BnCameraClient, public IBinder::DeathRecipient
112{
113public:
114            // construct a camera client from an existing remote
115    static  sp<Camera>  create(const sp<ICamera>& camera);
116    static  int32_t     getNumberOfCameras();
117    static  sp<Camera>  connect(int cameraId);
118                        ~Camera();
119            void        init();
120
121            status_t    reconnect();
122            void        disconnect();
123            status_t    lock();
124            status_t    unlock();
125
126            status_t    getStatus() { return mStatus; }
127
128            // pass the buffered ISurface to the camera service
129            status_t    setPreviewDisplay(const sp<Surface>& surface);
130            status_t    setPreviewDisplay(const sp<ISurface>& surface);
131
132            // start preview mode, must call setPreviewDisplay first
133            status_t    startPreview();
134
135            // stop preview mode
136            void        stopPreview();
137
138            // get preview state
139            bool        previewEnabled();
140
141            // start recording mode, must call setPreviewDisplay first
142            status_t    startRecording();
143
144            // stop recording mode
145            void        stopRecording();
146
147            // get recording state
148            bool        recordingEnabled();
149
150            // release a recording frame
151            void        releaseRecordingFrame(const sp<IMemory>& mem);
152
153            // autoFocus - status returned from callback
154            status_t    autoFocus();
155
156            // cancel auto focus
157            status_t    cancelAutoFocus();
158
159            // take a picture - picture returned from callback
160            status_t    takePicture();
161
162            // set preview/capture parameters - key/value pairs
163            status_t    setParameters(const String8& params);
164
165            // get preview/capture parameters - key/value pairs
166            String8     getParameters() const;
167
168            // send command to camera driver
169            status_t    sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
170
171            void        setListener(const sp<CameraListener>& listener);
172            void        setPreviewCallbackFlags(int preview_callback_flag);
173
174    // ICameraClient interface
175    virtual void        notifyCallback(int32_t msgType, int32_t ext, int32_t ext2);
176    virtual void        dataCallback(int32_t msgType, const sp<IMemory>& dataPtr);
177    virtual void        dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
178
179    sp<ICamera>         remote();
180
181private:
182                        Camera();
183                        Camera(const Camera&);
184                        Camera& operator=(const Camera);
185                        virtual void binderDied(const wp<IBinder>& who);
186
187            class DeathNotifier: public IBinder::DeathRecipient
188            {
189            public:
190                DeathNotifier() {
191                }
192
193                virtual void binderDied(const wp<IBinder>& who);
194            };
195
196            static sp<DeathNotifier> mDeathNotifier;
197
198            // helper function to obtain camera service handle
199            static const sp<ICameraService>& getCameraService();
200
201            sp<ICamera>         mCamera;
202            status_t            mStatus;
203
204            sp<CameraListener>  mListener;
205
206            friend class DeathNotifier;
207
208            static  Mutex               mLock;
209            static  sp<ICameraService>  mCameraService;
210
211};
212
213}; // namespace android
214
215#endif
216