android_hardware_Camera.cpp revision 69a017bc1d1649350f830dfada5c6ed5eac0b770 
1/*
2**
3** Copyright 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-JNI"
20#include <utils/Log.h>
21
22#include "jni.h"
23#include "JNIHelp.h"
24#include "android_runtime/AndroidRuntime.h"
25
26#include <utils/Vector.h>
27
28#include <gui/SurfaceTexture.h>
29#include <surfaceflinger/Surface.h>
30#include <camera/Camera.h>
31#include <binder/IMemory.h>
32
33using namespace android;
34
35struct fields_t {
36    jfieldID    context;
37    jfieldID    surface;
38    jfieldID    surfaceTexture;
39    jfieldID    facing;
40    jfieldID    orientation;
41    jmethodID   post_event;
42};
43
44static fields_t fields;
45static Mutex sLock;
46
47// provides persistent context for calls from native code to Java
48class JNICameraContext: public CameraListener
49{
50public:
51    JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera);
52    ~JNICameraContext() { release(); }
53    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2);
54    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr);
55    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
56    void addCallbackBuffer(JNIEnv *env, jbyteArray cbb, int msgType);
57    void setCallbackMode(JNIEnv *env, bool installed, bool manualMode);
58    sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; }
59    bool isRawImageCallbackBufferAvailable() const;
60    void release();
61
62private:
63    void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType);
64    void clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers);
65    void clearCallbackBuffers_l(JNIEnv *env);
66    jbyteArray getCallbackBuffer(JNIEnv *env, Vector<jbyteArray> *buffers, size_t bufferSize);
67
68    jobject     mCameraJObjectWeak;     // weak reference to java object
69    jclass      mCameraJClass;          // strong reference to java class
70    sp<Camera>  mCamera;                // strong reference to native object
71    Mutex       mLock;
72
73    /*
74     * Global reference application-managed raw image buffer queue.
75     *
76     * Manual-only mode is supported for raw image callbacks, which is
77     * set whenever method addCallbackBuffer() with msgType =
78     * CAMERA_MSG_RAW_IMAGE is called; otherwise, null is returned
79     * with raw image callbacks.
80     */
81    Vector<jbyteArray> mRawImageCallbackBuffers;
82
83    /*
84     * Application-managed preview buffer queue and the flags
85     * associated with the usage of the preview buffer callback.
86     */
87    Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[]
88    bool mManualBufferMode;              // Whether to use application managed buffers.
89    bool mManualCameraCallbackSet;       // Whether the callback has been set, used to
90                                         // reduce unnecessary calls to set the callback.
91};
92
93bool JNICameraContext::isRawImageCallbackBufferAvailable() const
94{
95    return !mRawImageCallbackBuffers.isEmpty();
96}
97
98sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
99{
100    sp<Camera> camera;
101    Mutex::Autolock _l(sLock);
102    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
103    if (context != NULL) {
104        camera = context->getCamera();
105    }
106    LOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
107    if (camera == 0) {
108        jniThrowRuntimeException(env, "Method called after release()");
109    }
110
111    if (pContext != NULL) *pContext = context;
112    return camera;
113}
114
115JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera)
116{
117    mCameraJObjectWeak = env->NewGlobalRef(weak_this);
118    mCameraJClass = (jclass)env->NewGlobalRef(clazz);
119    mCamera = camera;
120
121    mManualBufferMode = false;
122    mManualCameraCallbackSet = false;
123}
124
125void JNICameraContext::release()
126{
127    LOGV("release");
128    Mutex::Autolock _l(mLock);
129    JNIEnv *env = AndroidRuntime::getJNIEnv();
130
131    if (mCameraJObjectWeak != NULL) {
132        env->DeleteGlobalRef(mCameraJObjectWeak);
133        mCameraJObjectWeak = NULL;
134    }
135    if (mCameraJClass != NULL) {
136        env->DeleteGlobalRef(mCameraJClass);
137        mCameraJClass = NULL;
138    }
139    clearCallbackBuffers_l(env);
140    mCamera.clear();
141}
142
143void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2)
144{
145    LOGV("notify");
146
147    // VM pointer will be NULL if object is released
148    Mutex::Autolock _l(mLock);
149    if (mCameraJObjectWeak == NULL) {
150        LOGW("callback on dead camera object");
151        return;
152    }
153    JNIEnv *env = AndroidRuntime::getJNIEnv();
154
155    /*
156     * If the notification or msgType is CAMERA_MSG_RAW_IMAGE_NOTIFY, change it
157     * to CAMERA_MSG_RAW_IMAGE since CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed
158     * to the Java app.
159     */
160    if (msgType == CAMERA_MSG_RAW_IMAGE_NOTIFY) {
161        msgType = CAMERA_MSG_RAW_IMAGE;
162    }
163
164    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
165            mCameraJObjectWeak, msgType, ext1, ext2, NULL);
166}
167
168jbyteArray JNICameraContext::getCallbackBuffer(
169        JNIEnv* env, Vector<jbyteArray>* buffers, size_t bufferSize)
170{
171    jbyteArray obj = NULL;
172
173    // Vector access should be protected by lock in postData()
174    if (!buffers->isEmpty()) {
175        LOGV("Using callback buffer from queue of length %d", buffers->size());
176        jbyteArray globalBuffer = buffers->itemAt(0);
177        buffers->removeAt(0);
178
179        obj = (jbyteArray)env->NewLocalRef(globalBuffer);
180        env->DeleteGlobalRef(globalBuffer);
181
182        if (obj != NULL) {
183            jsize bufferLength = env->GetArrayLength(obj);
184            if ((int)bufferLength < (int)bufferSize) {
185                LOGE("Callback buffer was too small! Expected %d bytes, but got %d bytes!",
186                    bufferSize, bufferLength);
187                env->DeleteLocalRef(obj);
188                return NULL;
189            }
190        }
191    }
192
193    return obj;
194}
195
196void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType)
197{
198    jbyteArray obj = NULL;
199
200    // allocate Java byte array and copy data
201    if (dataPtr != NULL) {
202        ssize_t offset;
203        size_t size;
204        sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size);
205        LOGV("copyAndPost: off=%ld, size=%d", offset, size);
206        uint8_t *heapBase = (uint8_t*)heap->base();
207
208        if (heapBase != NULL) {
209            const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset);
210
211            if (!mManualBufferMode) {
212                LOGV("Allocating callback buffer");
213                obj = env->NewByteArray(size);
214            } else {
215                switch (msgType) {
216                    case CAMERA_MSG_PREVIEW_FRAME: {
217                        obj = getCallbackBuffer(env, &mCallbackBuffers, size);
218
219                        if (mCallbackBuffers.isEmpty()) {
220                            LOGV("Out of buffers, clearing callback!");
221                            mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP);
222                            mManualCameraCallbackSet = false;
223
224                            if (obj == NULL) {
225                                return;
226                            }
227                        }
228                        break;
229                    }
230                    case CAMERA_MSG_RAW_IMAGE: {
231                        obj = getCallbackBuffer(env, &mRawImageCallbackBuffers, size);
232                        break;
233                    }
234                    default: {
235                        jniThrowRuntimeException(env, "Unsupported message type");
236                        return;
237                    }
238                }
239            }
240
241            if (obj == NULL) {
242                LOGE("Couldn't allocate byte array for JPEG data");
243                env->ExceptionClear();
244            } else {
245                env->SetByteArrayRegion(obj, 0, size, data);
246            }
247        } else {
248            LOGE("image heap is NULL");
249        }
250    }
251
252    // post image data to Java
253    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
254            mCameraJObjectWeak, msgType, 0, 0, obj);
255    if (obj) {
256        env->DeleteLocalRef(obj);
257    }
258}
259
260void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr)
261{
262    // VM pointer will be NULL if object is released
263    Mutex::Autolock _l(mLock);
264    JNIEnv *env = AndroidRuntime::getJNIEnv();
265    if (mCameraJObjectWeak == NULL) {
266        LOGW("callback on dead camera object");
267        return;
268    }
269
270    // return data based on callback type
271    switch (msgType) {
272        case CAMERA_MSG_VIDEO_FRAME:
273            // should never happen
274            break;
275
276        // For backward-compatibility purpose, if there is no callback
277        // buffer for raw image, the callback returns null.
278        case CAMERA_MSG_RAW_IMAGE:
279            LOGV("rawCallback");
280            if (mRawImageCallbackBuffers.isEmpty()) {
281                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
282                        mCameraJObjectWeak, msgType, 0, 0, NULL);
283            } else {
284                copyAndPost(env, dataPtr, msgType);
285            }
286            break;
287
288        default:
289            LOGV("dataCallback(%d, %p)", msgType, dataPtr.get());
290            copyAndPost(env, dataPtr, msgType);
291            break;
292    }
293}
294
295void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
296{
297    // TODO: plumb up to Java. For now, just drop the timestamp
298    postData(msgType, dataPtr);
299}
300
301void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
302{
303    Mutex::Autolock _l(mLock);
304    mManualBufferMode = manualMode;
305    mManualCameraCallbackSet = false;
306
307    // In order to limit the over usage of binder threads, all non-manual buffer
308    // callbacks use FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
309    //
310    // Continuous callbacks will have the callback re-registered from handleMessage.
311    // Manual buffer mode will operate as fast as possible, relying on the finite supply
312    // of buffers for throttling.
313
314    if (!installed) {
315        mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP);
316        clearCallbackBuffers_l(env, &mCallbackBuffers);
317    } else if (mManualBufferMode) {
318        if (!mCallbackBuffers.isEmpty()) {
319            mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_CAMERA);
320            mManualCameraCallbackSet = true;
321        }
322    } else {
323        mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
324        clearCallbackBuffers_l(env, &mCallbackBuffers);
325    }
326}
327
328void JNICameraContext::addCallbackBuffer(
329        JNIEnv *env, jbyteArray cbb, int msgType)
330{
331    LOGV("addCallbackBuffer: 0x%x", msgType);
332    if (cbb != NULL) {
333        Mutex::Autolock _l(mLock);
334        switch (msgType) {
335            case CAMERA_MSG_PREVIEW_FRAME: {
336                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
337                mCallbackBuffers.push(callbackBuffer);
338
339                LOGV("Adding callback buffer to queue, %d total",
340                        mCallbackBuffers.size());
341
342                // We want to make sure the camera knows we're ready for the
343                // next frame. This may have come unset had we not had a
344                // callbackbuffer ready for it last time.
345                if (mManualBufferMode && !mManualCameraCallbackSet) {
346                    mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_CAMERA);
347                    mManualCameraCallbackSet = true;
348                }
349                break;
350            }
351            case CAMERA_MSG_RAW_IMAGE: {
352                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
353                mRawImageCallbackBuffers.push(callbackBuffer);
354                break;
355            }
356            default: {
357                jniThrowException(env,
358                        "java/lang/IllegalArgumentException",
359                        "Unsupported message type");
360                return;
361            }
362        }
363    } else {
364       LOGE("Null byte array!");
365    }
366}
367
368void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
369{
370    clearCallbackBuffers_l(env, &mCallbackBuffers);
371    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
372}
373
374void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
375    LOGV("Clearing callback buffers, %d remained", buffers->size());
376    while (!buffers->isEmpty()) {
377        env->DeleteGlobalRef(buffers->top());
378        buffers->pop();
379    }
380}
381
382static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
383{
384    return Camera::getNumberOfCameras();
385}
386
387static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
388    jint cameraId, jobject info_obj)
389{
390    CameraInfo cameraInfo;
391    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
392    if (rc != NO_ERROR) {
393        jniThrowRuntimeException(env, "Fail to get camera info");
394        return;
395    }
396    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
397    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
398}
399
400// connect to camera service
401static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
402    jobject weak_this, jint cameraId)
403{
404    sp<Camera> camera = Camera::connect(cameraId);
405
406    if (camera == NULL) {
407        jniThrowRuntimeException(env, "Fail to connect to camera service");
408        return;
409    }
410
411    // make sure camera hardware is alive
412    if (camera->getStatus() != NO_ERROR) {
413        jniThrowRuntimeException(env, "Camera initialization failed");
414        return;
415    }
416
417    jclass clazz = env->GetObjectClass(thiz);
418    if (clazz == NULL) {
419        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
420        return;
421    }
422
423    // We use a weak reference so the Camera object can be garbage collected.
424    // The reference is only used as a proxy for callbacks.
425    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
426    context->incStrong(thiz);
427    camera->setListener(context);
428
429    // save context in opaque field
430    env->SetIntField(thiz, fields.context, (int)context.get());
431}
432
433// disconnect from camera service
434// It's okay to call this when the native camera context is already null.
435// This handles the case where the user has called release() and the
436// finalizer is invoked later.
437static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
438{
439    // TODO: Change to LOGV
440    LOGV("release camera");
441    JNICameraContext* context = NULL;
442    sp<Camera> camera;
443    {
444        Mutex::Autolock _l(sLock);
445        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
446
447        // Make sure we do not attempt to callback on a deleted Java object.
448        env->SetIntField(thiz, fields.context, 0);
449    }
450
451    // clean up if release has not been called before
452    if (context != NULL) {
453        camera = context->getCamera();
454        context->release();
455        LOGV("native_release: context=%p camera=%p", context, camera.get());
456
457        // clear callbacks
458        if (camera != NULL) {
459            camera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP);
460            camera->disconnect();
461        }
462
463        // remove context to prevent further Java access
464        context->decStrong(thiz);
465    }
466}
467
468static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface)
469{
470    LOGV("setPreviewDisplay");
471    sp<Camera> camera = get_native_camera(env, thiz, NULL);
472    if (camera == 0) return;
473
474    sp<Surface> surface = NULL;
475    if (jSurface != NULL) {
476        surface = reinterpret_cast<Surface*>(env->GetIntField(jSurface, fields.surface));
477    }
478    if (camera->setPreviewDisplay(surface) != NO_ERROR) {
479        jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed");
480    }
481}
482
483static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
484        jobject thiz, jobject jSurfaceTexture)
485{
486    LOGV("setPreviewTexture");
487    sp<Camera> camera = get_native_camera(env, thiz, NULL);
488    if (camera == 0) return;
489
490    sp<SurfaceTexture> surfaceTexture = NULL;
491    if (jSurfaceTexture != NULL) {
492        surfaceTexture = reinterpret_cast<SurfaceTexture*>(env->GetIntField(
493                jSurfaceTexture, fields.surfaceTexture));
494    }
495    if (camera->setPreviewTexture(surfaceTexture) != NO_ERROR) {
496        jniThrowException(env, "java/io/IOException",
497                "setPreviewTexture failed");
498    }
499}
500
501static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
502{
503    LOGV("startPreview");
504    sp<Camera> camera = get_native_camera(env, thiz, NULL);
505    if (camera == 0) return;
506
507    if (camera->startPreview() != NO_ERROR) {
508        jniThrowRuntimeException(env, "startPreview failed");
509        return;
510    }
511}
512
513static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
514{
515    LOGV("stopPreview");
516    sp<Camera> c = get_native_camera(env, thiz, NULL);
517    if (c == 0) return;
518
519    c->stopPreview();
520}
521
522static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
523{
524    LOGV("previewEnabled");
525    sp<Camera> c = get_native_camera(env, thiz, NULL);
526    if (c == 0) return false;
527
528    return c->previewEnabled();
529}
530
531static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
532{
533    LOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
534    // Important: Only install preview_callback if the Java code has called
535    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
536    // each preview frame for nothing.
537    JNICameraContext* context;
538    sp<Camera> camera = get_native_camera(env, thiz, &context);
539    if (camera == 0) return;
540
541    // setCallbackMode will take care of setting the context flags and calling
542    // camera->setPreviewCallbackFlags within a mutex for us.
543    context->setCallbackMode(env, installed, manualBuffer);
544}
545
546static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
547    LOGV("addCallbackBuffer: 0x%x", msgType);
548
549    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
550
551    if (context != NULL) {
552        context->addCallbackBuffer(env, bytes, msgType);
553    }
554}
555
556static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
557{
558    LOGV("autoFocus");
559    JNICameraContext* context;
560    sp<Camera> c = get_native_camera(env, thiz, &context);
561    if (c == 0) return;
562
563    if (c->autoFocus() != NO_ERROR) {
564        jniThrowRuntimeException(env, "autoFocus failed");
565    }
566}
567
568static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
569{
570    LOGV("cancelAutoFocus");
571    JNICameraContext* context;
572    sp<Camera> c = get_native_camera(env, thiz, &context);
573    if (c == 0) return;
574
575    if (c->cancelAutoFocus() != NO_ERROR) {
576        jniThrowRuntimeException(env, "cancelAutoFocus failed");
577    }
578}
579
580static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
581{
582    LOGV("takePicture");
583    JNICameraContext* context;
584    sp<Camera> camera = get_native_camera(env, thiz, &context);
585    if (camera == 0) return;
586
587    /*
588     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
589     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
590     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
591     * is enabled to receive the callback notification but no data.
592     *
593     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
594     * Java application.
595     */
596    if (msgType & CAMERA_MSG_RAW_IMAGE) {
597        LOGV("Enable raw image callback buffer");
598        if (!context->isRawImageCallbackBufferAvailable()) {
599            LOGV("Enable raw image notification, since no callback buffer exists");
600            msgType &= ~CAMERA_MSG_RAW_IMAGE;
601            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
602        }
603    }
604
605    if (camera->takePicture(msgType) != NO_ERROR) {
606        jniThrowRuntimeException(env, "takePicture failed");
607        return;
608    }
609}
610
611static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
612{
613    LOGV("setParameters");
614    sp<Camera> camera = get_native_camera(env, thiz, NULL);
615    if (camera == 0) return;
616
617    const jchar* str = env->GetStringCritical(params, 0);
618    String8 params8;
619    if (params) {
620        params8 = String8(str, env->GetStringLength(params));
621        env->ReleaseStringCritical(params, str);
622    }
623    if (camera->setParameters(params8) != NO_ERROR) {
624        jniThrowRuntimeException(env, "setParameters failed");
625        return;
626    }
627}
628
629static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
630{
631    LOGV("getParameters");
632    sp<Camera> camera = get_native_camera(env, thiz, NULL);
633    if (camera == 0) return 0;
634
635    return env->NewStringUTF(camera->getParameters().string());
636}
637
638static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
639{
640    LOGV("reconnect");
641    sp<Camera> camera = get_native_camera(env, thiz, NULL);
642    if (camera == 0) return;
643
644    if (camera->reconnect() != NO_ERROR) {
645        jniThrowException(env, "java/io/IOException", "reconnect failed");
646        return;
647    }
648}
649
650static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
651{
652    LOGV("lock");
653    sp<Camera> camera = get_native_camera(env, thiz, NULL);
654    if (camera == 0) return;
655
656    if (camera->lock() != NO_ERROR) {
657        jniThrowRuntimeException(env, "lock failed");
658    }
659}
660
661static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
662{
663    LOGV("unlock");
664    sp<Camera> camera = get_native_camera(env, thiz, NULL);
665    if (camera == 0) return;
666
667    if (camera->unlock() != NO_ERROR) {
668        jniThrowRuntimeException(env, "unlock failed");
669    }
670}
671
672static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
673{
674    LOGV("startSmoothZoom");
675    sp<Camera> camera = get_native_camera(env, thiz, NULL);
676    if (camera == 0) return;
677
678    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
679    if (rc == BAD_VALUE) {
680        char msg[64];
681        sprintf(msg, "invalid zoom value=%d", value);
682        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
683    } else if (rc != NO_ERROR) {
684        jniThrowRuntimeException(env, "start smooth zoom failed");
685    }
686}
687
688static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
689{
690    LOGV("stopSmoothZoom");
691    sp<Camera> camera = get_native_camera(env, thiz, NULL);
692    if (camera == 0) return;
693
694    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
695        jniThrowRuntimeException(env, "stop smooth zoom failed");
696    }
697}
698
699static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
700        jint value)
701{
702    LOGV("setDisplayOrientation");
703    sp<Camera> camera = get_native_camera(env, thiz, NULL);
704    if (camera == 0) return;
705
706    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
707        jniThrowRuntimeException(env, "set display orientation failed");
708    }
709}
710
711//-------------------------------------------------
712
713static JNINativeMethod camMethods[] = {
714  { "getNumberOfCameras",
715    "()I",
716    (void *)android_hardware_Camera_getNumberOfCameras },
717  { "getCameraInfo",
718    "(ILandroid/hardware/Camera$CameraInfo;)V",
719    (void*)android_hardware_Camera_getCameraInfo },
720  { "native_setup",
721    "(Ljava/lang/Object;I)V",
722    (void*)android_hardware_Camera_native_setup },
723  { "native_release",
724    "()V",
725    (void*)android_hardware_Camera_release },
726  { "setPreviewDisplay",
727    "(Landroid/view/Surface;)V",
728    (void *)android_hardware_Camera_setPreviewDisplay },
729  { "setPreviewTexture",
730    "(Landroid/graphics/SurfaceTexture;)V",
731    (void *)android_hardware_Camera_setPreviewTexture },
732  { "startPreview",
733    "()V",
734    (void *)android_hardware_Camera_startPreview },
735  { "stopPreview",
736    "()V",
737    (void *)android_hardware_Camera_stopPreview },
738  { "previewEnabled",
739    "()Z",
740    (void *)android_hardware_Camera_previewEnabled },
741  { "setHasPreviewCallback",
742    "(ZZ)V",
743    (void *)android_hardware_Camera_setHasPreviewCallback },
744  { "_addCallbackBuffer",
745    "([BI)V",
746    (void *)android_hardware_Camera_addCallbackBuffer },
747  { "native_autoFocus",
748    "()V",
749    (void *)android_hardware_Camera_autoFocus },
750  { "native_cancelAutoFocus",
751    "()V",
752    (void *)android_hardware_Camera_cancelAutoFocus },
753  { "native_takePicture",
754    "(I)V",
755    (void *)android_hardware_Camera_takePicture },
756  { "native_setParameters",
757    "(Ljava/lang/String;)V",
758    (void *)android_hardware_Camera_setParameters },
759  { "native_getParameters",
760    "()Ljava/lang/String;",
761    (void *)android_hardware_Camera_getParameters },
762  { "reconnect",
763    "()V",
764    (void*)android_hardware_Camera_reconnect },
765  { "lock",
766    "()V",
767    (void*)android_hardware_Camera_lock },
768  { "unlock",
769    "()V",
770    (void*)android_hardware_Camera_unlock },
771  { "startSmoothZoom",
772    "(I)V",
773    (void *)android_hardware_Camera_startSmoothZoom },
774  { "stopSmoothZoom",
775    "()V",
776    (void *)android_hardware_Camera_stopSmoothZoom },
777  { "setDisplayOrientation",
778    "(I)V",
779    (void *)android_hardware_Camera_setDisplayOrientation },
780};
781
782struct field {
783    const char *class_name;
784    const char *field_name;
785    const char *field_type;
786    jfieldID   *jfield;
787};
788
789static int find_fields(JNIEnv *env, field *fields, int count)
790{
791    for (int i = 0; i < count; i++) {
792        field *f = &fields[i];
793        jclass clazz = env->FindClass(f->class_name);
794        if (clazz == NULL) {
795            LOGE("Can't find %s", f->class_name);
796            return -1;
797        }
798
799        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
800        if (field == NULL) {
801            LOGE("Can't find %s.%s", f->class_name, f->field_name);
802            return -1;
803        }
804
805        *(f->jfield) = field;
806    }
807
808    return 0;
809}
810
811// Get all the required offsets in java class and register native functions
812int register_android_hardware_Camera(JNIEnv *env)
813{
814    field fields_to_find[] = {
815        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
816        { "android/view/Surface",    ANDROID_VIEW_SURFACE_JNI_ID, "I", &fields.surface },
817        { "android/graphics/SurfaceTexture",
818          ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I", &fields.surfaceTexture },
819        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
820        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
821    };
822
823    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
824        return -1;
825
826    jclass clazz = env->FindClass("android/hardware/Camera");
827    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
828                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
829    if (fields.post_event == NULL) {
830        LOGE("Can't find android/hardware/Camera.postEventFromNative");
831        return -1;
832    }
833
834
835    // Register native functions
836    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
837                                              camMethods, NELEM(camMethods));
838}
839