Camera.cpp revision 0319aaecb03aa83924ab4e3d9c9bc657c2e8bc06 
1/*
2**
3** Copyright (C) 2008, The Android Open Source Project
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//#define LOG_NDEBUG 0
19#define LOG_TAG "Camera"
20#include <utils/Log.h>
21#include <utils/threads.h>
22
23#include <binder/IServiceManager.h>
24#include <binder/IMemory.h>
25
26#include <camera/Camera.h>
27#include <camera/ICameraService.h>
28
29#include <surfaceflinger/Surface.h>
30
31namespace android {
32
33// client singleton for camera service binder interface
34Mutex Camera::mLock;
35sp<ICameraService> Camera::mCameraService;
36sp<Camera::DeathNotifier> Camera::mDeathNotifier;
37
38// establish binder interface to camera service
39const sp<ICameraService>& Camera::getCameraService()
40{
41    Mutex::Autolock _l(mLock);
42    if (mCameraService.get() == 0) {
43        sp<IServiceManager> sm = defaultServiceManager();
44        sp<IBinder> binder;
45        do {
46            binder = sm->getService(String16("media.camera"));
47            if (binder != 0)
48                break;
49            LOGW("CameraService not published, waiting...");
50            usleep(500000); // 0.5 s
51        } while(true);
52        if (mDeathNotifier == NULL) {
53            mDeathNotifier = new DeathNotifier();
54        }
55        binder->linkToDeath(mDeathNotifier);
56        mCameraService = interface_cast<ICameraService>(binder);
57    }
58    LOGE_IF(mCameraService==0, "no CameraService!?");
59    return mCameraService;
60}
61
62// ---------------------------------------------------------------------------
63
64Camera::Camera()
65{
66    init();
67}
68
69// construct a camera client from an existing camera remote
70sp<Camera> Camera::create(const sp<ICamera>& camera)
71{
72     LOGV("create");
73     if (camera == 0) {
74         LOGE("camera remote is a NULL pointer");
75         return 0;
76     }
77
78    sp<Camera> c = new Camera();
79    if (camera->connect(c) == NO_ERROR) {
80        c->mStatus = NO_ERROR;
81        c->mCamera = camera;
82        camera->asBinder()->linkToDeath(c);
83    }
84    return c;
85}
86
87void Camera::init()
88{
89    mStatus = UNKNOWN_ERROR;
90}
91
92Camera::~Camera()
93{
94    // We don't need to call disconnect() here because if the CameraService
95    // thinks we are the owner of the hardware, it will hold a (strong)
96    // reference to us, and we can't possibly be here. We also don't want to
97    // call disconnect() here if we are in the same process as mediaserver,
98    // because we may be invoked by CameraService::Client::connect() and will
99    // deadlock if we call any method of ICamera here.
100}
101
102int32_t Camera::getNumberOfCameras()
103{
104    const sp<ICameraService>& cs = getCameraService();
105    if (cs == 0) return 0;
106    return cs->getNumberOfCameras();
107}
108
109status_t Camera::getCameraInfo(int cameraId,
110                               struct CameraInfo* cameraInfo) {
111    const sp<ICameraService>& cs = getCameraService();
112    if (cs == 0) return UNKNOWN_ERROR;
113    return cs->getCameraInfo(cameraId, cameraInfo);
114}
115
116sp<Camera> Camera::connect(int cameraId)
117{
118    LOGV("connect");
119    sp<Camera> c = new Camera();
120    const sp<ICameraService>& cs = getCameraService();
121    if (cs != 0) {
122        c->mCamera = cs->connect(c, cameraId);
123    }
124    if (c->mCamera != 0) {
125        c->mCamera->asBinder()->linkToDeath(c);
126        c->mStatus = NO_ERROR;
127    } else {
128        c.clear();
129    }
130    return c;
131}
132
133void Camera::disconnect()
134{
135    LOGV("disconnect");
136    if (mCamera != 0) {
137        mCamera->disconnect();
138        mCamera->asBinder()->unlinkToDeath(this);
139        mCamera = 0;
140    }
141}
142
143status_t Camera::reconnect()
144{
145    LOGV("reconnect");
146    sp <ICamera> c = mCamera;
147    if (c == 0) return NO_INIT;
148    return c->connect(this);
149}
150
151sp<ICamera> Camera::remote()
152{
153    return mCamera;
154}
155
156status_t Camera::lock()
157{
158    sp <ICamera> c = mCamera;
159    if (c == 0) return NO_INIT;
160    return c->lock();
161}
162
163status_t Camera::unlock()
164{
165    sp <ICamera> c = mCamera;
166    if (c == 0) return NO_INIT;
167    return c->unlock();
168}
169
170// pass the buffered ISurface to the camera service
171status_t Camera::setPreviewDisplay(const sp<Surface>& surface)
172{
173    LOGV("setPreviewDisplay");
174    sp <ICamera> c = mCamera;
175    if (c == 0) return NO_INIT;
176    if (surface != 0) {
177        return c->setPreviewDisplay(surface->getISurface());
178    } else {
179        LOGD("app passed NULL surface");
180        return c->setPreviewDisplay(0);
181    }
182}
183
184status_t Camera::setPreviewDisplay(const sp<ISurface>& surface)
185{
186    LOGV("setPreviewDisplay");
187    if (surface == 0) {
188        LOGD("app passed NULL surface");
189    }
190    sp <ICamera> c = mCamera;
191    if (c == 0) return NO_INIT;
192    return c->setPreviewDisplay(surface);
193}
194
195
196// start preview mode
197status_t Camera::startPreview()
198{
199    LOGV("startPreview");
200    sp <ICamera> c = mCamera;
201    if (c == 0) return NO_INIT;
202    return c->startPreview();
203}
204
205// start recording mode, must call setPreviewDisplay first
206status_t Camera::startRecording()
207{
208    LOGV("startRecording");
209    sp <ICamera> c = mCamera;
210    if (c == 0) return NO_INIT;
211    return c->startRecording();
212}
213
214// stop preview mode
215void Camera::stopPreview()
216{
217    LOGV("stopPreview");
218    sp <ICamera> c = mCamera;
219    if (c == 0) return;
220    c->stopPreview();
221}
222
223// stop recording mode
224void Camera::stopRecording()
225{
226    LOGV("stopRecording");
227    sp <ICamera> c = mCamera;
228    if (c == 0) return;
229    c->stopRecording();
230}
231
232// release a recording frame
233void Camera::releaseRecordingFrame(const sp<IMemory>& mem)
234{
235    LOGV("releaseRecordingFrame");
236    sp <ICamera> c = mCamera;
237    if (c == 0) return;
238    c->releaseRecordingFrame(mem);
239}
240
241// get preview state
242bool Camera::previewEnabled()
243{
244    LOGV("previewEnabled");
245    sp <ICamera> c = mCamera;
246    if (c == 0) return false;
247    return c->previewEnabled();
248}
249
250// get recording state
251bool Camera::recordingEnabled()
252{
253    LOGV("recordingEnabled");
254    sp <ICamera> c = mCamera;
255    if (c == 0) return false;
256    return c->recordingEnabled();
257}
258
259status_t Camera::autoFocus()
260{
261    LOGV("autoFocus");
262    sp <ICamera> c = mCamera;
263    if (c == 0) return NO_INIT;
264    return c->autoFocus();
265}
266
267status_t Camera::cancelAutoFocus()
268{
269    LOGV("cancelAutoFocus");
270    sp <ICamera> c = mCamera;
271    if (c == 0) return NO_INIT;
272    return c->cancelAutoFocus();
273}
274
275// take a picture
276status_t Camera::takePicture()
277{
278    LOGV("takePicture");
279    sp <ICamera> c = mCamera;
280    if (c == 0) return NO_INIT;
281    return c->takePicture();
282}
283
284// set preview/capture parameters - key/value pairs
285status_t Camera::setParameters(const String8& params)
286{
287    LOGV("setParameters");
288    sp <ICamera> c = mCamera;
289    if (c == 0) return NO_INIT;
290    return c->setParameters(params);
291}
292
293// get preview/capture parameters - key/value pairs
294String8 Camera::getParameters() const
295{
296    LOGV("getParameters");
297    String8 params;
298    sp <ICamera> c = mCamera;
299    if (c != 0) params = mCamera->getParameters();
300    return params;
301}
302
303// send command to camera driver
304status_t Camera::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2)
305{
306    LOGV("sendCommand");
307    sp <ICamera> c = mCamera;
308    if (c == 0) return NO_INIT;
309    return c->sendCommand(cmd, arg1, arg2);
310}
311
312void Camera::setListener(const sp<CameraListener>& listener)
313{
314    Mutex::Autolock _l(mLock);
315    mListener = listener;
316}
317
318void Camera::setPreviewCallbackFlags(int flag)
319{
320    LOGV("setPreviewCallbackFlags");
321    sp <ICamera> c = mCamera;
322    if (c == 0) return;
323    mCamera->setPreviewCallbackFlag(flag);
324}
325
326// callback from camera service
327void Camera::notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2)
328{
329    sp<CameraListener> listener;
330    {
331        Mutex::Autolock _l(mLock);
332        listener = mListener;
333    }
334    if (listener != NULL) {
335        listener->notify(msgType, ext1, ext2);
336    }
337}
338
339// callback from camera service when frame or image is ready
340void Camera::dataCallback(int32_t msgType, const sp<IMemory>& dataPtr)
341{
342    sp<CameraListener> listener;
343    {
344        Mutex::Autolock _l(mLock);
345        listener = mListener;
346    }
347    if (listener != NULL) {
348        listener->postData(msgType, dataPtr);
349    }
350}
351
352// callback from camera service when timestamped frame is ready
353void Camera::dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
354{
355    sp<CameraListener> listener;
356    {
357        Mutex::Autolock _l(mLock);
358        listener = mListener;
359    }
360    if (listener != NULL) {
361        listener->postDataTimestamp(timestamp, msgType, dataPtr);
362    }
363}
364
365void Camera::binderDied(const wp<IBinder>& who) {
366    LOGW("ICamera died");
367    notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, 0);
368}
369
370void Camera::DeathNotifier::binderDied(const wp<IBinder>& who) {
371    LOGV("binderDied");
372    Mutex::Autolock _l(Camera::mLock);
373    Camera::mCameraService.clear();
374    LOGW("Camera server died!");
375}
376
377}; // namespace android
378
379