Camera.h revision b5ca4618a722a21f084fe8bfc1c2992749ccd3f0 
1/*
2 * Copyright (C) 2008 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_HARDWARE_CAMERA_H
18#define ANDROID_HARDWARE_CAMERA_H
19
20#include <utils/Timers.h>
21#include <camera/ICameraClient.h>
22
23namespace android {
24
25/*
26 * A set of bit masks for specifying how the received preview frames are
27 * handled before the previewCallback() call.
28 *
29 * The least significant 3 bits of an "int" value are used for this purpose:
30 *
31 * ..... 0 0 0
32 *       ^ ^ ^
33 *       | | |---------> determine whether the callback is enabled or not
34 *       | |-----------> determine whether the callback is one-shot or not
35 *       |-------------> determine whether the frame is copied out or not
36 *
37 * WARNING:
38 * When a frame is sent directly without copying, it is the frame receiver's
39 * responsiblity to make sure that the frame data won't get corrupted by
40 * subsequent preview frames filled by the camera. This flag is recommended
41 * only when copying out data brings significant performance price and the
42 * handling/processing of the received frame data is always faster than
43 * the preview frame rate so that data corruption won't occur.
44 *
45 * For instance,
46 * 1. 0x00 disables the callback. In this case, copy out and one shot bits
47 *    are ignored.
48 * 2. 0x01 enables a callback without copying out the received frames. A
49 *    typical use case is the Camcorder application to avoid making costly
50 *    frame copies.
51 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical
52 *    use case is the Camera application.
53 * 4. 0x07 is enabling a callback with frame copied out only once. A typical use
54 *    case is the Barcode scanner application.
55 */
56#define FRAME_CALLBACK_FLAG_ENABLE_MASK              0x01
57#define FRAME_CALLBACK_FLAG_ONE_SHOT_MASK            0x02
58#define FRAME_CALLBACK_FLAG_COPY_OUT_MASK            0x04
59
60// Typical use cases
61#define FRAME_CALLBACK_FLAG_NOOP                     0x00
62#define FRAME_CALLBACK_FLAG_CAMCORDER                0x01
63#define FRAME_CALLBACK_FLAG_CAMERA                   0x05
64#define FRAME_CALLBACK_FLAG_BARCODE_SCANNER          0x07
65
66// msgType in notifyCallback and dataCallback functions
67enum {
68    CAMERA_MSG_ERROR            = 0x001,
69    CAMERA_MSG_SHUTTER          = 0x002,
70    CAMERA_MSG_FOCUS            = 0x004,
71    CAMERA_MSG_ZOOM             = 0x008,
72    CAMERA_MSG_PREVIEW_FRAME    = 0x010,
73    CAMERA_MSG_VIDEO_FRAME      = 0x020,
74    CAMERA_MSG_POSTVIEW_FRAME   = 0x040,
75    CAMERA_MSG_RAW_IMAGE        = 0x080,
76    CAMERA_MSG_COMPRESSED_IMAGE = 0x100,
77    CAMERA_MSG_ALL_MSGS         = 0x1FF
78};
79
80// cmdType in sendCommand functions
81enum {
82    CAMERA_CMD_START_SMOOTH_ZOOM     = 1,
83    CAMERA_CMD_STOP_SMOOTH_ZOOM      = 2,
84    CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3,
85
86    // cmdType to disable/enable shutter sound.
87    // In sendCommand passing arg1 = 0 will disable,
88    // while passing arg1 = 1 will enable the shutter sound.
89    CAMERA_CMD_ENABLE_SHUTTER_SOUND = 4,
90};
91
92// camera fatal errors
93enum {
94    CAMERA_ERROR_UKNOWN  = 1,
95    CAMERA_ERROR_SERVER_DIED = 100
96};
97
98enum {
99    CAMERA_FACING_BACK = 0,
100    CAMERA_FACING_FRONT = 1 /* The camera faces to the user */
101};
102
103struct CameraInfo {
104
105    /**
106     * The direction that the camera faces to. It should be
107     * CAMERA_FACING_BACK or CAMERA_FACING_FRONT.
108     */
109    int facing;
110
111    /**
112     * The orientation of the camera image. The value is the angle that the
113     * camera image needs to be rotated clockwise so it shows correctly on
114     * the display in its natural orientation. It should be 0, 90, 180, or 270.
115     *
116     * For example, suppose a device has a naturally tall screen, but the camera
117     * sensor is mounted in landscape. If the top side of the camera sensor is
118     * aligned with the right edge of the display in natural orientation, the
119     * value should be 90.
120     */
121    int orientation;
122};
123
124class ICameraService;
125class ICamera;
126class Surface;
127class Mutex;
128class String8;
129
130// ref-counted object for callbacks
131class CameraListener: virtual public RefBase
132{
133public:
134    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2) = 0;
135    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr) = 0;
136    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) = 0;
137};
138
139class Camera : public BnCameraClient, public IBinder::DeathRecipient
140{
141public:
142            // construct a camera client from an existing remote
143    static  sp<Camera>  create(const sp<ICamera>& camera);
144    static  int32_t     getNumberOfCameras();
145    static  status_t    getCameraInfo(int cameraId,
146                                      struct CameraInfo* cameraInfo);
147    static  sp<Camera>  connect(int cameraId);
148                        ~Camera();
149            void        init();
150
151            status_t    reconnect();
152            void        disconnect();
153            status_t    lock();
154            status_t    unlock();
155
156            status_t    getStatus() { return mStatus; }
157
158            // pass the buffered Surface to the camera service
159            status_t    setPreviewDisplay(const sp<Surface>& surface);
160
161            // start preview mode, must call setPreviewDisplay first
162            status_t    startPreview();
163
164            // stop preview mode
165            void        stopPreview();
166
167            // get preview state
168            bool        previewEnabled();
169
170            // start recording mode, must call setPreviewDisplay first
171            status_t    startRecording();
172
173            // stop recording mode
174            void        stopRecording();
175
176            // get recording state
177            bool        recordingEnabled();
178
179            // release a recording frame
180            void        releaseRecordingFrame(const sp<IMemory>& mem);
181
182            // autoFocus - status returned from callback
183            status_t    autoFocus();
184
185            // cancel auto focus
186            status_t    cancelAutoFocus();
187
188            // take a picture - picture returned from callback
189            status_t    takePicture();
190
191            // set preview/capture parameters - key/value pairs
192            status_t    setParameters(const String8& params);
193
194            // get preview/capture parameters - key/value pairs
195            String8     getParameters() const;
196
197            // send command to camera driver
198            status_t    sendCommand(int32_t cmd, int32_t arg1, int32_t arg2);
199
200            void        setListener(const sp<CameraListener>& listener);
201            void        setPreviewCallbackFlags(int preview_callback_flag);
202
203    // ICameraClient interface
204    virtual void        notifyCallback(int32_t msgType, int32_t ext, int32_t ext2);
205    virtual void        dataCallback(int32_t msgType, const sp<IMemory>& dataPtr);
206    virtual void        dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
207
208    sp<ICamera>         remote();
209
210private:
211                        Camera();
212                        Camera(const Camera&);
213                        Camera& operator=(const Camera);
214                        virtual void binderDied(const wp<IBinder>& who);
215
216            class DeathNotifier: public IBinder::DeathRecipient
217            {
218            public:
219                DeathNotifier() {
220                }
221
222                virtual void binderDied(const wp<IBinder>& who);
223            };
224
225            static sp<DeathNotifier> mDeathNotifier;
226
227            // helper function to obtain camera service handle
228            static const sp<ICameraService>& getCameraService();
229
230            sp<ICamera>         mCamera;
231            status_t            mStatus;
232
233            sp<CameraListener>  mListener;
234
235            friend class DeathNotifier;
236
237            static  Mutex               mLock;
238            static  sp<ICameraService>  mCameraService;
239
240};
241
242}; // namespace android
243
244#endif
245