Camera.cpp revision 627baacc748c5e2ed68bdb256aea4d70fcfe9ce4 
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        return c;
84    }
85    return 0;
86}
87
88void Camera::init()
89{
90    mStatus = UNKNOWN_ERROR;
91}
92
93Camera::~Camera()
94{
95    // We don't need to call disconnect() here because if the CameraService
96    // thinks we are the owner of the hardware, it will hold a (strong)
97    // reference to us, and we can't possibly be here. We also don't want to
98    // call disconnect() here if we are in the same process as mediaserver,
99    // because we may be invoked by CameraService::Client::connect() and will
100    // deadlock if we call any method of ICamera here.
101}
102
103int32_t Camera::getNumberOfCameras()
104{
105    const sp<ICameraService>& cs = getCameraService();
106    if (cs == 0) return 0;
107    return cs->getNumberOfCameras();
108}
109
110status_t Camera::getCameraInfo(int cameraId,
111                               struct CameraInfo* cameraInfo) {
112    const sp<ICameraService>& cs = getCameraService();
113    if (cs == 0) return UNKNOWN_ERROR;
114    return cs->getCameraInfo(cameraId, cameraInfo);
115}
116
117sp<Camera> Camera::connect(int cameraId)
118{
119    LOGV("connect");
120    sp<Camera> c = new Camera();
121    const sp<ICameraService>& cs = getCameraService();
122    if (cs != 0) {
123        c->mCamera = cs->connect(c, cameraId);
124    }
125    if (c->mCamera != 0) {
126        c->mCamera->asBinder()->linkToDeath(c);
127        c->mStatus = NO_ERROR;
128    } else {
129        c.clear();
130    }
131    return c;
132}
133
134void Camera::disconnect()
135{
136    LOGV("disconnect");
137    if (mCamera != 0) {
138        mCamera->disconnect();
139        mCamera->asBinder()->unlinkToDeath(this);
140        mCamera = 0;
141    }
142}
143
144status_t Camera::reconnect()
145{
146    LOGV("reconnect");
147    sp <ICamera> c = mCamera;
148    if (c == 0) return NO_INIT;
149    return c->connect(this);
150}
151
152sp<ICamera> Camera::remote()
153{
154    return mCamera;
155}
156
157status_t Camera::lock()
158{
159    sp <ICamera> c = mCamera;
160    if (c == 0) return NO_INIT;
161    return c->lock();
162}
163
164status_t Camera::unlock()
165{
166    sp <ICamera> c = mCamera;
167    if (c == 0) return NO_INIT;
168    return c->unlock();
169}
170
171// pass the buffered Surface to the camera service
172status_t Camera::setPreviewDisplay(const sp<Surface>& surface)
173{
174    LOGV("setPreviewDisplay(%p)", surface.get());
175    sp <ICamera> c = mCamera;
176    if (c == 0) return NO_INIT;
177    if (surface != 0) {
178        return c->setPreviewDisplay(surface);
179    } else {
180        LOGD("app passed NULL surface");
181        return c->setPreviewDisplay(0);
182    }
183}
184
185// start preview mode
186status_t Camera::startPreview()
187{
188    LOGV("startPreview");
189    sp <ICamera> c = mCamera;
190    if (c == 0) return NO_INIT;
191    return c->startPreview();
192}
193
194int32_t Camera::getNumberOfVideoBuffers() const
195{
196    LOGV("getNumberOfVideoBuffers");
197    sp <ICamera> c = mCamera;
198    if (c == 0) return 0;
199    return c->getNumberOfVideoBuffers();
200}
201
202sp<IMemory> Camera::getVideoBuffer(int32_t index) const
203{
204    LOGV("getVideoBuffer: %d", index);
205    sp <ICamera> c = mCamera;
206    if (c == 0) return 0;
207    return c->getVideoBuffer(index);
208}
209
210status_t Camera::storeMetaDataInBuffers(bool enabled)
211{
212    LOGV("storeMetaDataInBuffers: %s",
213            enabled? "true": "false");
214    sp <ICamera> c = mCamera;
215    if (c == 0) return NO_INIT;
216    return c->storeMetaDataInBuffers(enabled);
217}
218
219// start recording mode, must call setPreviewDisplay first
220status_t Camera::startRecording()
221{
222    LOGV("startRecording");
223    sp <ICamera> c = mCamera;
224    if (c == 0) return NO_INIT;
225    return c->startRecording();
226}
227
228// stop preview mode
229void Camera::stopPreview()
230{
231    LOGV("stopPreview");
232    sp <ICamera> c = mCamera;
233    if (c == 0) return;
234    c->stopPreview();
235}
236
237// stop recording mode
238void Camera::stopRecording()
239{
240    LOGV("stopRecording");
241    sp <ICamera> c = mCamera;
242    if (c == 0) return;
243    c->stopRecording();
244}
245
246// release a recording frame
247void Camera::releaseRecordingFrame(const sp<IMemory>& mem)
248{
249    LOGV("releaseRecordingFrame");
250    sp <ICamera> c = mCamera;
251    if (c == 0) return;
252    c->releaseRecordingFrame(mem);
253}
254
255// get preview state
256bool Camera::previewEnabled()
257{
258    LOGV("previewEnabled");
259    sp <ICamera> c = mCamera;
260    if (c == 0) return false;
261    return c->previewEnabled();
262}
263
264// get recording state
265bool Camera::recordingEnabled()
266{
267    LOGV("recordingEnabled");
268    sp <ICamera> c = mCamera;
269    if (c == 0) return false;
270    return c->recordingEnabled();
271}
272
273status_t Camera::autoFocus()
274{
275    LOGV("autoFocus");
276    sp <ICamera> c = mCamera;
277    if (c == 0) return NO_INIT;
278    return c->autoFocus();
279}
280
281status_t Camera::cancelAutoFocus()
282{
283    LOGV("cancelAutoFocus");
284    sp <ICamera> c = mCamera;
285    if (c == 0) return NO_INIT;
286    return c->cancelAutoFocus();
287}
288
289// take a picture
290status_t Camera::takePicture()
291{
292    LOGV("takePicture");
293    sp <ICamera> c = mCamera;
294    if (c == 0) return NO_INIT;
295    return c->takePicture();
296}
297
298// set preview/capture parameters - key/value pairs
299status_t Camera::setParameters(const String8& params)
300{
301    LOGV("setParameters");
302    sp <ICamera> c = mCamera;
303    if (c == 0) return NO_INIT;
304    return c->setParameters(params);
305}
306
307// get preview/capture parameters - key/value pairs
308String8 Camera::getParameters() const
309{
310    LOGV("getParameters");
311    String8 params;
312    sp <ICamera> c = mCamera;
313    if (c != 0) params = mCamera->getParameters();
314    return params;
315}
316
317// send command to camera driver
318status_t Camera::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2)
319{
320    LOGV("sendCommand");
321    sp <ICamera> c = mCamera;
322    if (c == 0) return NO_INIT;
323    return c->sendCommand(cmd, arg1, arg2);
324}
325
326void Camera::setListener(const sp<CameraListener>& listener)
327{
328    Mutex::Autolock _l(mLock);
329    mListener = listener;
330}
331
332void Camera::setPreviewCallbackFlags(int flag)
333{
334    LOGV("setPreviewCallbackFlags");
335    sp <ICamera> c = mCamera;
336    if (c == 0) return;
337    mCamera->setPreviewCallbackFlag(flag);
338}
339
340// callback from camera service
341void Camera::notifyCallback(int32_t msgType, int32_t ext1, int32_t ext2)
342{
343    sp<CameraListener> listener;
344    {
345        Mutex::Autolock _l(mLock);
346        listener = mListener;
347    }
348    if (listener != NULL) {
349        listener->notify(msgType, ext1, ext2);
350    }
351}
352
353// callback from camera service when frame or image is ready
354void Camera::dataCallback(int32_t msgType, const sp<IMemory>& dataPtr)
355{
356    sp<CameraListener> listener;
357    {
358        Mutex::Autolock _l(mLock);
359        listener = mListener;
360    }
361    if (listener != NULL) {
362        listener->postData(msgType, dataPtr);
363    }
364}
365
366// callback from camera service when timestamped frame is ready
367void Camera::dataCallbackTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
368{
369    sp<CameraListener> listener;
370    {
371        Mutex::Autolock _l(mLock);
372        listener = mListener;
373    }
374    if (listener != NULL) {
375        listener->postDataTimestamp(timestamp, msgType, dataPtr);
376    } else {
377        LOGW("No listener was set. Drop a recording frame.");
378        releaseRecordingFrame(dataPtr);
379    }
380}
381
382void Camera::binderDied(const wp<IBinder>& who) {
383    LOGW("ICamera died");
384    notifyCallback(CAMERA_MSG_ERROR, CAMERA_ERROR_SERVER_DIED, 0);
385}
386
387void Camera::DeathNotifier::binderDied(const wp<IBinder>& who) {
388    LOGV("binderDied");
389    Mutex::Autolock _l(Camera::mLock);
390    Camera::mCameraService.clear();
391    LOGW("Camera server died!");
392}
393
394}; // namespace android
395