android_hardware_Camera.cpp revision e00cab707dcaf6f05adb5ccb9c80fdf25c483427 
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        jniThrowException(env, "java/lang/RuntimeException", "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                        jniThrowException(env,
236                            "java/lang/RuntimeException", "Unsupported message type");
237                        return;
238                    }
239                }
240            }
241
242            if (obj == NULL) {
243                LOGE("Couldn't allocate byte array for JPEG data");
244                env->ExceptionClear();
245            } else {
246                env->SetByteArrayRegion(obj, 0, size, data);
247            }
248        } else {
249            LOGE("image heap is NULL");
250        }
251    }
252
253    // post image data to Java
254    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
255            mCameraJObjectWeak, msgType, 0, 0, obj);
256    if (obj) {
257        env->DeleteLocalRef(obj);
258    }
259}
260
261void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr)
262{
263    // VM pointer will be NULL if object is released
264    Mutex::Autolock _l(mLock);
265    JNIEnv *env = AndroidRuntime::getJNIEnv();
266    if (mCameraJObjectWeak == NULL) {
267        LOGW("callback on dead camera object");
268        return;
269    }
270
271    // return data based on callback type
272    switch (msgType) {
273        case CAMERA_MSG_VIDEO_FRAME:
274            // should never happen
275            break;
276
277        // For backward-compatibility purpose, if there is no callback
278        // buffer for raw image, the callback returns null.
279        case CAMERA_MSG_RAW_IMAGE:
280            LOGV("rawCallback");
281            if (mRawImageCallbackBuffers.isEmpty()) {
282                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
283                        mCameraJObjectWeak, msgType, 0, 0, NULL);
284            } else {
285                copyAndPost(env, dataPtr, msgType);
286            }
287            break;
288
289        default:
290            LOGV("dataCallback(%d, %p)", msgType, dataPtr.get());
291            copyAndPost(env, dataPtr, msgType);
292            break;
293    }
294}
295
296void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
297{
298    // TODO: plumb up to Java. For now, just drop the timestamp
299    postData(msgType, dataPtr);
300}
301
302void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
303{
304    Mutex::Autolock _l(mLock);
305    mManualBufferMode = manualMode;
306    mManualCameraCallbackSet = false;
307
308    // In order to limit the over usage of binder threads, all non-manual buffer
309    // callbacks use FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
310    //
311    // Continuous callbacks will have the callback re-registered from handleMessage.
312    // Manual buffer mode will operate as fast as possible, relying on the finite supply
313    // of buffers for throttling.
314
315    if (!installed) {
316        mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP);
317        clearCallbackBuffers_l(env, &mCallbackBuffers);
318    } else if (mManualBufferMode) {
319        if (!mCallbackBuffers.isEmpty()) {
320            mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_CAMERA);
321            mManualCameraCallbackSet = true;
322        }
323    } else {
324        mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
325        clearCallbackBuffers_l(env, &mCallbackBuffers);
326    }
327}
328
329void JNICameraContext::addCallbackBuffer(
330        JNIEnv *env, jbyteArray cbb, int msgType)
331{
332    LOGV("addCallbackBuffer: 0x%x", msgType);
333    if (cbb != NULL) {
334        Mutex::Autolock _l(mLock);
335        switch (msgType) {
336            case CAMERA_MSG_PREVIEW_FRAME: {
337                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
338                mCallbackBuffers.push(callbackBuffer);
339
340                LOGV("Adding callback buffer to queue, %d total",
341                        mCallbackBuffers.size());
342
343                // We want to make sure the camera knows we're ready for the
344                // next frame. This may have come unset had we not had a
345                // callbackbuffer ready for it last time.
346                if (mManualBufferMode && !mManualCameraCallbackSet) {
347                    mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_CAMERA);
348                    mManualCameraCallbackSet = true;
349                }
350                break;
351            }
352            case CAMERA_MSG_RAW_IMAGE: {
353                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
354                mRawImageCallbackBuffers.push(callbackBuffer);
355                break;
356            }
357            default: {
358                jniThrowException(env,
359                        "java/lang/IllegalArgumentException",
360                        "Unsupported message type");
361                return;
362            }
363        }
364    } else {
365       LOGE("Null byte array!");
366    }
367}
368
369void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
370{
371    clearCallbackBuffers_l(env, &mCallbackBuffers);
372    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
373}
374
375void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
376    LOGV("Clearing callback buffers, %d remained", buffers->size());
377    while (!buffers->isEmpty()) {
378        env->DeleteGlobalRef(buffers->top());
379        buffers->pop();
380    }
381}
382
383static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
384{
385    return Camera::getNumberOfCameras();
386}
387
388static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
389    jint cameraId, jobject info_obj)
390{
391    CameraInfo cameraInfo;
392    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
393    if (rc != NO_ERROR) {
394        jniThrowException(env, "java/lang/RuntimeException",
395                          "Fail to get camera info");
396        return;
397    }
398    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
399    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
400}
401
402// connect to camera service
403static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
404    jobject weak_this, jint cameraId)
405{
406    sp<Camera> camera = Camera::connect(cameraId);
407
408    if (camera == NULL) {
409        jniThrowException(env, "java/lang/RuntimeException",
410                          "Fail to connect to camera service");
411        return;
412    }
413
414    // make sure camera hardware is alive
415    if (camera->getStatus() != NO_ERROR) {
416        jniThrowException(env, "java/lang/RuntimeException", "Camera initialization failed");
417        return;
418    }
419
420    jclass clazz = env->GetObjectClass(thiz);
421    if (clazz == NULL) {
422        jniThrowException(env, "java/lang/RuntimeException", "Can't find android/hardware/Camera");
423        return;
424    }
425
426    // We use a weak reference so the Camera object can be garbage collected.
427    // The reference is only used as a proxy for callbacks.
428    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
429    context->incStrong(thiz);
430    camera->setListener(context);
431
432    // save context in opaque field
433    env->SetIntField(thiz, fields.context, (int)context.get());
434}
435
436// disconnect from camera service
437// It's okay to call this when the native camera context is already null.
438// This handles the case where the user has called release() and the
439// finalizer is invoked later.
440static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
441{
442    // TODO: Change to LOGV
443    LOGV("release camera");
444    JNICameraContext* context = NULL;
445    sp<Camera> camera;
446    {
447        Mutex::Autolock _l(sLock);
448        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
449
450        // Make sure we do not attempt to callback on a deleted Java object.
451        env->SetIntField(thiz, fields.context, 0);
452    }
453
454    // clean up if release has not been called before
455    if (context != NULL) {
456        camera = context->getCamera();
457        context->release();
458        LOGV("native_release: context=%p camera=%p", context, camera.get());
459
460        // clear callbacks
461        if (camera != NULL) {
462            camera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP);
463            camera->disconnect();
464        }
465
466        // remove context to prevent further Java access
467        context->decStrong(thiz);
468    }
469}
470
471static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface)
472{
473    LOGV("setPreviewDisplay");
474    sp<Camera> camera = get_native_camera(env, thiz, NULL);
475    if (camera == 0) return;
476
477    sp<Surface> surface = NULL;
478    if (jSurface != NULL) {
479        surface = reinterpret_cast<Surface*>(env->GetIntField(jSurface, fields.surface));
480    }
481    if (camera->setPreviewDisplay(surface) != NO_ERROR) {
482        jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed");
483    }
484}
485
486static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
487        jobject thiz, jobject jSurfaceTexture)
488{
489    LOGV("setPreviewTexture");
490    sp<Camera> camera = get_native_camera(env, thiz, NULL);
491    if (camera == 0) return;
492
493    sp<SurfaceTexture> surfaceTexture = NULL;
494    if (jSurfaceTexture != NULL) {
495        surfaceTexture = reinterpret_cast<SurfaceTexture*>(env->GetIntField(
496                jSurfaceTexture, fields.surfaceTexture));
497    }
498    if (camera->setPreviewTexture(surfaceTexture) != NO_ERROR) {
499        jniThrowException(env, "java/io/IOException",
500                "setPreviewTexture failed");
501    }
502}
503
504static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
505{
506    LOGV("startPreview");
507    sp<Camera> camera = get_native_camera(env, thiz, NULL);
508    if (camera == 0) return;
509
510    if (camera->startPreview() != NO_ERROR) {
511        jniThrowException(env, "java/lang/RuntimeException", "startPreview failed");
512        return;
513    }
514}
515
516static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
517{
518    LOGV("stopPreview");
519    sp<Camera> c = get_native_camera(env, thiz, NULL);
520    if (c == 0) return;
521
522    c->stopPreview();
523}
524
525static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
526{
527    LOGV("previewEnabled");
528    sp<Camera> c = get_native_camera(env, thiz, NULL);
529    if (c == 0) return false;
530
531    return c->previewEnabled();
532}
533
534static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
535{
536    LOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
537    // Important: Only install preview_callback if the Java code has called
538    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
539    // each preview frame for nothing.
540    JNICameraContext* context;
541    sp<Camera> camera = get_native_camera(env, thiz, &context);
542    if (camera == 0) return;
543
544    // setCallbackMode will take care of setting the context flags and calling
545    // camera->setPreviewCallbackFlags within a mutex for us.
546    context->setCallbackMode(env, installed, manualBuffer);
547}
548
549static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
550    LOGV("addCallbackBuffer: 0x%x", msgType);
551
552    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
553
554    if (context != NULL) {
555        context->addCallbackBuffer(env, bytes, msgType);
556    }
557}
558
559static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
560{
561    LOGV("autoFocus");
562    JNICameraContext* context;
563    sp<Camera> c = get_native_camera(env, thiz, &context);
564    if (c == 0) return;
565
566    if (c->autoFocus() != NO_ERROR) {
567        jniThrowException(env, "java/lang/RuntimeException", "autoFocus failed");
568    }
569}
570
571static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
572{
573    LOGV("cancelAutoFocus");
574    JNICameraContext* context;
575    sp<Camera> c = get_native_camera(env, thiz, &context);
576    if (c == 0) return;
577
578    if (c->cancelAutoFocus() != NO_ERROR) {
579        jniThrowException(env, "java/lang/RuntimeException", "cancelAutoFocus failed");
580    }
581}
582
583static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
584{
585    LOGV("takePicture");
586    JNICameraContext* context;
587    sp<Camera> camera = get_native_camera(env, thiz, &context);
588    if (camera == 0) return;
589
590    /*
591     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
592     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
593     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
594     * is enabled to receive the callback notification but no data.
595     *
596     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
597     * Java application.
598     */
599    if (msgType & CAMERA_MSG_RAW_IMAGE) {
600        LOGV("Enable raw image callback buffer");
601        if (!context->isRawImageCallbackBufferAvailable()) {
602            LOGV("Enable raw image notification, since no callback buffer exists");
603            msgType &= ~CAMERA_MSG_RAW_IMAGE;
604            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
605        }
606    }
607
608    if (camera->takePicture(msgType) != NO_ERROR) {
609        jniThrowException(env, "java/lang/RuntimeException", "takePicture failed");
610        return;
611    }
612}
613
614static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
615{
616    LOGV("setParameters");
617    sp<Camera> camera = get_native_camera(env, thiz, NULL);
618    if (camera == 0) return;
619
620    const jchar* str = env->GetStringCritical(params, 0);
621    String8 params8;
622    if (params) {
623        params8 = String8(str, env->GetStringLength(params));
624        env->ReleaseStringCritical(params, str);
625    }
626    if (camera->setParameters(params8) != NO_ERROR) {
627        jniThrowException(env, "java/lang/RuntimeException", "setParameters failed");
628        return;
629    }
630}
631
632static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
633{
634    LOGV("getParameters");
635    sp<Camera> camera = get_native_camera(env, thiz, NULL);
636    if (camera == 0) return 0;
637
638    return env->NewStringUTF(camera->getParameters().string());
639}
640
641static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
642{
643    LOGV("reconnect");
644    sp<Camera> camera = get_native_camera(env, thiz, NULL);
645    if (camera == 0) return;
646
647    if (camera->reconnect() != NO_ERROR) {
648        jniThrowException(env, "java/io/IOException", "reconnect failed");
649        return;
650    }
651}
652
653static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
654{
655    LOGV("lock");
656    sp<Camera> camera = get_native_camera(env, thiz, NULL);
657    if (camera == 0) return;
658
659    if (camera->lock() != NO_ERROR) {
660        jniThrowException(env, "java/lang/RuntimeException", "lock failed");
661    }
662}
663
664static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
665{
666    LOGV("unlock");
667    sp<Camera> camera = get_native_camera(env, thiz, NULL);
668    if (camera == 0) return;
669
670    if (camera->unlock() != NO_ERROR) {
671        jniThrowException(env, "java/lang/RuntimeException", "unlock failed");
672    }
673}
674
675static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
676{
677    LOGV("startSmoothZoom");
678    sp<Camera> camera = get_native_camera(env, thiz, NULL);
679    if (camera == 0) return;
680
681    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
682    if (rc == BAD_VALUE) {
683        char msg[64];
684        sprintf(msg, "invalid zoom value=%d", value);
685        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
686    } else if (rc != NO_ERROR) {
687        jniThrowException(env, "java/lang/RuntimeException", "start smooth zoom failed");
688    }
689}
690
691static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
692{
693    LOGV("stopSmoothZoom");
694    sp<Camera> camera = get_native_camera(env, thiz, NULL);
695    if (camera == 0) return;
696
697    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
698        jniThrowException(env, "java/lang/RuntimeException", "stop smooth zoom failed");
699    }
700}
701
702static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
703        jint value)
704{
705    LOGV("setDisplayOrientation");
706    sp<Camera> camera = get_native_camera(env, thiz, NULL);
707    if (camera == 0) return;
708
709    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
710        jniThrowException(env, "java/lang/RuntimeException", "set display orientation failed");
711    }
712}
713
714//-------------------------------------------------
715
716static JNINativeMethod camMethods[] = {
717  { "getNumberOfCameras",
718    "()I",
719    (void *)android_hardware_Camera_getNumberOfCameras },
720  { "getCameraInfo",
721    "(ILandroid/hardware/Camera$CameraInfo;)V",
722    (void*)android_hardware_Camera_getCameraInfo },
723  { "native_setup",
724    "(Ljava/lang/Object;I)V",
725    (void*)android_hardware_Camera_native_setup },
726  { "native_release",
727    "()V",
728    (void*)android_hardware_Camera_release },
729  { "setPreviewDisplay",
730    "(Landroid/view/Surface;)V",
731    (void *)android_hardware_Camera_setPreviewDisplay },
732  { "setPreviewTexture",
733    "(Landroid/graphics/SurfaceTexture;)V",
734    (void *)android_hardware_Camera_setPreviewTexture },
735  { "startPreview",
736    "()V",
737    (void *)android_hardware_Camera_startPreview },
738  { "stopPreview",
739    "()V",
740    (void *)android_hardware_Camera_stopPreview },
741  { "previewEnabled",
742    "()Z",
743    (void *)android_hardware_Camera_previewEnabled },
744  { "setHasPreviewCallback",
745    "(ZZ)V",
746    (void *)android_hardware_Camera_setHasPreviewCallback },
747  { "_addCallbackBuffer",
748    "([BI)V",
749    (void *)android_hardware_Camera_addCallbackBuffer },
750  { "native_autoFocus",
751    "()V",
752    (void *)android_hardware_Camera_autoFocus },
753  { "native_cancelAutoFocus",
754    "()V",
755    (void *)android_hardware_Camera_cancelAutoFocus },
756  { "native_takePicture",
757    "(I)V",
758    (void *)android_hardware_Camera_takePicture },
759  { "native_setParameters",
760    "(Ljava/lang/String;)V",
761    (void *)android_hardware_Camera_setParameters },
762  { "native_getParameters",
763    "()Ljava/lang/String;",
764    (void *)android_hardware_Camera_getParameters },
765  { "reconnect",
766    "()V",
767    (void*)android_hardware_Camera_reconnect },
768  { "lock",
769    "()V",
770    (void*)android_hardware_Camera_lock },
771  { "unlock",
772    "()V",
773    (void*)android_hardware_Camera_unlock },
774  { "startSmoothZoom",
775    "(I)V",
776    (void *)android_hardware_Camera_startSmoothZoom },
777  { "stopSmoothZoom",
778    "()V",
779    (void *)android_hardware_Camera_stopSmoothZoom },
780  { "setDisplayOrientation",
781    "(I)V",
782    (void *)android_hardware_Camera_setDisplayOrientation },
783};
784
785struct field {
786    const char *class_name;
787    const char *field_name;
788    const char *field_type;
789    jfieldID   *jfield;
790};
791
792static int find_fields(JNIEnv *env, field *fields, int count)
793{
794    for (int i = 0; i < count; i++) {
795        field *f = &fields[i];
796        jclass clazz = env->FindClass(f->class_name);
797        if (clazz == NULL) {
798            LOGE("Can't find %s", f->class_name);
799            return -1;
800        }
801
802        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
803        if (field == NULL) {
804            LOGE("Can't find %s.%s", f->class_name, f->field_name);
805            return -1;
806        }
807
808        *(f->jfield) = field;
809    }
810
811    return 0;
812}
813
814// Get all the required offsets in java class and register native functions
815int register_android_hardware_Camera(JNIEnv *env)
816{
817    field fields_to_find[] = {
818        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
819        { "android/view/Surface",    ANDROID_VIEW_SURFACE_JNI_ID, "I", &fields.surface },
820        { "android/graphics/SurfaceTexture",
821          ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I", &fields.surfaceTexture },
822        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
823        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
824    };
825
826    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
827        return -1;
828
829    jclass clazz = env->FindClass("android/hardware/Camera");
830    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
831                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
832    if (fields.post_event == NULL) {
833        LOGE("Can't find android/hardware/Camera.postEventFromNative");
834        return -1;
835    }
836
837
838    // Register native functions
839    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
840                                              camMethods, NELEM(camMethods));
841}
842