android_hardware_Camera.cpp revision bb1e275c0e684dd213f124da77110cdd9d6f090c 
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    jfieldID    face_rect;
42    jfieldID    face_score;
43    jfieldID    rect_left;
44    jfieldID    rect_top;
45    jfieldID    rect_right;
46    jfieldID    rect_bottom;
47    jmethodID   post_event;
48    jmethodID   rect_constructor;
49    jmethodID   face_constructor;
50};
51
52static fields_t fields;
53static Mutex sLock;
54
55// provides persistent context for calls from native code to Java
56class JNICameraContext: public CameraListener
57{
58public:
59    JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera);
60    ~JNICameraContext() { release(); }
61    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2);
62    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr,
63                          camera_frame_metadata_t *metadata);
64    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
65    void postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata);
66    void addCallbackBuffer(JNIEnv *env, jbyteArray cbb, int msgType);
67    void setCallbackMode(JNIEnv *env, bool installed, bool manualMode);
68    sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; }
69    bool isRawImageCallbackBufferAvailable() const;
70    void release();
71
72private:
73    void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType);
74    void clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers);
75    void clearCallbackBuffers_l(JNIEnv *env);
76    jbyteArray getCallbackBuffer(JNIEnv *env, Vector<jbyteArray> *buffers, size_t bufferSize);
77
78    jobject     mCameraJObjectWeak;     // weak reference to java object
79    jclass      mCameraJClass;          // strong reference to java class
80    sp<Camera>  mCamera;                // strong reference to native object
81    jclass      mFaceClass;  // strong reference to Face class
82    jclass      mRectClass;  // strong reference to Rect class
83    Mutex       mLock;
84
85    /*
86     * Global reference application-managed raw image buffer queue.
87     *
88     * Manual-only mode is supported for raw image callbacks, which is
89     * set whenever method addCallbackBuffer() with msgType =
90     * CAMERA_MSG_RAW_IMAGE is called; otherwise, null is returned
91     * with raw image callbacks.
92     */
93    Vector<jbyteArray> mRawImageCallbackBuffers;
94
95    /*
96     * Application-managed preview buffer queue and the flags
97     * associated with the usage of the preview buffer callback.
98     */
99    Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[]
100    bool mManualBufferMode;              // Whether to use application managed buffers.
101    bool mManualCameraCallbackSet;       // Whether the callback has been set, used to
102                                         // reduce unnecessary calls to set the callback.
103};
104
105bool JNICameraContext::isRawImageCallbackBufferAvailable() const
106{
107    return !mRawImageCallbackBuffers.isEmpty();
108}
109
110sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
111{
112    sp<Camera> camera;
113    Mutex::Autolock _l(sLock);
114    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
115    if (context != NULL) {
116        camera = context->getCamera();
117    }
118    LOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
119    if (camera == 0) {
120        jniThrowRuntimeException(env, "Method called after release()");
121    }
122
123    if (pContext != NULL) *pContext = context;
124    return camera;
125}
126
127JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera)
128{
129    mCameraJObjectWeak = env->NewGlobalRef(weak_this);
130    mCameraJClass = (jclass)env->NewGlobalRef(clazz);
131    mCamera = camera;
132
133    jclass faceClazz = env->FindClass("android/hardware/Camera$Face");
134    mFaceClass = (jclass) env->NewGlobalRef(faceClazz);
135
136    jclass rectClazz = env->FindClass("android/graphics/Rect");
137    mRectClass = (jclass) env->NewGlobalRef(rectClazz);
138
139    mManualBufferMode = false;
140    mManualCameraCallbackSet = false;
141}
142
143void JNICameraContext::release()
144{
145    LOGV("release");
146    Mutex::Autolock _l(mLock);
147    JNIEnv *env = AndroidRuntime::getJNIEnv();
148
149    if (mCameraJObjectWeak != NULL) {
150        env->DeleteGlobalRef(mCameraJObjectWeak);
151        mCameraJObjectWeak = NULL;
152    }
153    if (mCameraJClass != NULL) {
154        env->DeleteGlobalRef(mCameraJClass);
155        mCameraJClass = NULL;
156    }
157    if (mFaceClass != NULL) {
158        env->DeleteGlobalRef(mFaceClass);
159        mFaceClass = NULL;
160    }
161    if (mRectClass != NULL) {
162        env->DeleteGlobalRef(mRectClass);
163        mRectClass = NULL;
164    }
165    clearCallbackBuffers_l(env);
166    mCamera.clear();
167}
168
169void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2)
170{
171    LOGV("notify");
172
173    // VM pointer will be NULL if object is released
174    Mutex::Autolock _l(mLock);
175    if (mCameraJObjectWeak == NULL) {
176        LOGW("callback on dead camera object");
177        return;
178    }
179    JNIEnv *env = AndroidRuntime::getJNIEnv();
180
181    /*
182     * If the notification or msgType is CAMERA_MSG_RAW_IMAGE_NOTIFY, change it
183     * to CAMERA_MSG_RAW_IMAGE since CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed
184     * to the Java app.
185     */
186    if (msgType == CAMERA_MSG_RAW_IMAGE_NOTIFY) {
187        msgType = CAMERA_MSG_RAW_IMAGE;
188    }
189
190    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
191            mCameraJObjectWeak, msgType, ext1, ext2, NULL);
192}
193
194jbyteArray JNICameraContext::getCallbackBuffer(
195        JNIEnv* env, Vector<jbyteArray>* buffers, size_t bufferSize)
196{
197    jbyteArray obj = NULL;
198
199    // Vector access should be protected by lock in postData()
200    if (!buffers->isEmpty()) {
201        LOGV("Using callback buffer from queue of length %d", buffers->size());
202        jbyteArray globalBuffer = buffers->itemAt(0);
203        buffers->removeAt(0);
204
205        obj = (jbyteArray)env->NewLocalRef(globalBuffer);
206        env->DeleteGlobalRef(globalBuffer);
207
208        if (obj != NULL) {
209            jsize bufferLength = env->GetArrayLength(obj);
210            if ((int)bufferLength < (int)bufferSize) {
211                LOGE("Callback buffer was too small! Expected %d bytes, but got %d bytes!",
212                    bufferSize, bufferLength);
213                env->DeleteLocalRef(obj);
214                return NULL;
215            }
216        }
217    }
218
219    return obj;
220}
221
222void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType)
223{
224    jbyteArray obj = NULL;
225
226    // allocate Java byte array and copy data
227    if (dataPtr != NULL) {
228        ssize_t offset;
229        size_t size;
230        sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size);
231        LOGV("copyAndPost: off=%ld, size=%d", offset, size);
232        uint8_t *heapBase = (uint8_t*)heap->base();
233
234        if (heapBase != NULL) {
235            const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset);
236
237            if (!mManualBufferMode) {
238                LOGV("Allocating callback buffer");
239                obj = env->NewByteArray(size);
240            } else {
241                switch (msgType) {
242                    case CAMERA_MSG_PREVIEW_FRAME: {
243                        obj = getCallbackBuffer(env, &mCallbackBuffers, size);
244
245                        if (mCallbackBuffers.isEmpty()) {
246                            LOGV("Out of buffers, clearing callback!");
247                            mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
248                            mManualCameraCallbackSet = false;
249
250                            if (obj == NULL) {
251                                return;
252                            }
253                        }
254                        break;
255                    }
256                    case CAMERA_MSG_RAW_IMAGE: {
257                        obj = getCallbackBuffer(env, &mRawImageCallbackBuffers, size);
258                        break;
259                    }
260                    default: {
261                        jniThrowRuntimeException(env, "Unsupported message type");
262                        return;
263                    }
264                }
265            }
266
267            if (obj == NULL) {
268                LOGE("Couldn't allocate byte array for JPEG data");
269                env->ExceptionClear();
270            } else {
271                env->SetByteArrayRegion(obj, 0, size, data);
272            }
273        } else {
274            LOGE("image heap is NULL");
275        }
276    }
277
278    // post image data to Java
279    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
280            mCameraJObjectWeak, msgType, 0, 0, obj);
281    if (obj) {
282        env->DeleteLocalRef(obj);
283    }
284}
285
286void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr,
287                                camera_frame_metadata_t *metadata)
288{
289    // VM pointer will be NULL if object is released
290    Mutex::Autolock _l(mLock);
291    JNIEnv *env = AndroidRuntime::getJNIEnv();
292    if (mCameraJObjectWeak == NULL) {
293        LOGW("callback on dead camera object");
294        return;
295    }
296
297    int32_t dataMsgType = msgType & ~CAMERA_MSG_PREVIEW_METADATA;
298
299    // return data based on callback type
300    switch (dataMsgType) {
301        case CAMERA_MSG_VIDEO_FRAME:
302            // should never happen
303            break;
304
305        // For backward-compatibility purpose, if there is no callback
306        // buffer for raw image, the callback returns null.
307        case CAMERA_MSG_RAW_IMAGE:
308            LOGV("rawCallback");
309            if (mRawImageCallbackBuffers.isEmpty()) {
310                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
311                        mCameraJObjectWeak, dataMsgType, 0, 0, NULL);
312            } else {
313                copyAndPost(env, dataPtr, dataMsgType);
314            }
315            break;
316
317        // There is no data.
318        case 0:
319            break;
320
321        default:
322            LOGV("dataCallback(%d, %p)", dataMsgType, dataPtr.get());
323            copyAndPost(env, dataPtr, dataMsgType);
324            break;
325    }
326
327    // post frame metadata to Java
328    if (metadata && (msgType & CAMERA_MSG_PREVIEW_METADATA)) {
329        postMetadata(env, CAMERA_MSG_PREVIEW_METADATA, metadata);
330    }
331}
332
333void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
334{
335    // TODO: plumb up to Java. For now, just drop the timestamp
336    postData(msgType, dataPtr, NULL);
337}
338
339void JNICameraContext::postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata)
340{
341    jobjectArray obj = NULL;
342    obj = (jobjectArray) env->NewObjectArray(metadata->number_of_faces,
343                                             mFaceClass, NULL);
344    if (obj == NULL) {
345        LOGE("Couldn't allocate face metadata array");
346        return;
347    }
348
349    for (int i = 0; i < metadata->number_of_faces; i++) {
350        jobject face = env->NewObject(mFaceClass, fields.face_constructor);
351        env->SetObjectArrayElement(obj, i, face);
352
353        jobject rect = env->NewObject(mRectClass, fields.rect_constructor);
354        env->SetIntField(rect, fields.rect_left, metadata->faces[i].rect[0]);
355        env->SetIntField(rect, fields.rect_top, metadata->faces[i].rect[1]);
356        env->SetIntField(rect, fields.rect_right, metadata->faces[i].rect[2]);
357        env->SetIntField(rect, fields.rect_bottom, metadata->faces[i].rect[3]);
358
359        env->SetObjectField(face, fields.face_rect, rect);
360        env->SetIntField(face, fields.face_score, metadata->faces[i].score);
361
362        env->DeleteLocalRef(face);
363        env->DeleteLocalRef(rect);
364    }
365    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
366            mCameraJObjectWeak, msgType, 0, 0, obj);
367    env->DeleteLocalRef(obj);
368}
369
370void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
371{
372    Mutex::Autolock _l(mLock);
373    mManualBufferMode = manualMode;
374    mManualCameraCallbackSet = false;
375
376    // In order to limit the over usage of binder threads, all non-manual buffer
377    // callbacks use CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
378    //
379    // Continuous callbacks will have the callback re-registered from handleMessage.
380    // Manual buffer mode will operate as fast as possible, relying on the finite supply
381    // of buffers for throttling.
382
383    if (!installed) {
384        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
385        clearCallbackBuffers_l(env, &mCallbackBuffers);
386    } else if (mManualBufferMode) {
387        if (!mCallbackBuffers.isEmpty()) {
388            mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
389            mManualCameraCallbackSet = true;
390        }
391    } else {
392        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
393        clearCallbackBuffers_l(env, &mCallbackBuffers);
394    }
395}
396
397void JNICameraContext::addCallbackBuffer(
398        JNIEnv *env, jbyteArray cbb, int msgType)
399{
400    LOGV("addCallbackBuffer: 0x%x", msgType);
401    if (cbb != NULL) {
402        Mutex::Autolock _l(mLock);
403        switch (msgType) {
404            case CAMERA_MSG_PREVIEW_FRAME: {
405                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
406                mCallbackBuffers.push(callbackBuffer);
407
408                LOGV("Adding callback buffer to queue, %d total",
409                        mCallbackBuffers.size());
410
411                // We want to make sure the camera knows we're ready for the
412                // next frame. This may have come unset had we not had a
413                // callbackbuffer ready for it last time.
414                if (mManualBufferMode && !mManualCameraCallbackSet) {
415                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
416                    mManualCameraCallbackSet = true;
417                }
418                break;
419            }
420            case CAMERA_MSG_RAW_IMAGE: {
421                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
422                mRawImageCallbackBuffers.push(callbackBuffer);
423                break;
424            }
425            default: {
426                jniThrowException(env,
427                        "java/lang/IllegalArgumentException",
428                        "Unsupported message type");
429                return;
430            }
431        }
432    } else {
433       LOGE("Null byte array!");
434    }
435}
436
437void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
438{
439    clearCallbackBuffers_l(env, &mCallbackBuffers);
440    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
441}
442
443void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
444    LOGV("Clearing callback buffers, %d remained", buffers->size());
445    while (!buffers->isEmpty()) {
446        env->DeleteGlobalRef(buffers->top());
447        buffers->pop();
448    }
449}
450
451static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
452{
453    return Camera::getNumberOfCameras();
454}
455
456static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
457    jint cameraId, jobject info_obj)
458{
459    CameraInfo cameraInfo;
460    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
461    if (rc != NO_ERROR) {
462        jniThrowRuntimeException(env, "Fail to get camera info");
463        return;
464    }
465    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
466    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
467}
468
469// connect to camera service
470static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
471    jobject weak_this, jint cameraId)
472{
473    sp<Camera> camera = Camera::connect(cameraId);
474
475    if (camera == NULL) {
476        jniThrowRuntimeException(env, "Fail to connect to camera service");
477        return;
478    }
479
480    // make sure camera hardware is alive
481    if (camera->getStatus() != NO_ERROR) {
482        jniThrowRuntimeException(env, "Camera initialization failed");
483        return;
484    }
485
486    jclass clazz = env->GetObjectClass(thiz);
487    if (clazz == NULL) {
488        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
489        return;
490    }
491
492    // We use a weak reference so the Camera object can be garbage collected.
493    // The reference is only used as a proxy for callbacks.
494    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
495    context->incStrong(thiz);
496    camera->setListener(context);
497
498    // save context in opaque field
499    env->SetIntField(thiz, fields.context, (int)context.get());
500}
501
502// disconnect from camera service
503// It's okay to call this when the native camera context is already null.
504// This handles the case where the user has called release() and the
505// finalizer is invoked later.
506static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
507{
508    // TODO: Change to LOGV
509    LOGV("release camera");
510    JNICameraContext* context = NULL;
511    sp<Camera> camera;
512    {
513        Mutex::Autolock _l(sLock);
514        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
515
516        // Make sure we do not attempt to callback on a deleted Java object.
517        env->SetIntField(thiz, fields.context, 0);
518    }
519
520    // clean up if release has not been called before
521    if (context != NULL) {
522        camera = context->getCamera();
523        context->release();
524        LOGV("native_release: context=%p camera=%p", context, camera.get());
525
526        // clear callbacks
527        if (camera != NULL) {
528            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
529            camera->disconnect();
530        }
531
532        // remove context to prevent further Java access
533        context->decStrong(thiz);
534    }
535}
536
537static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface)
538{
539    LOGV("setPreviewDisplay");
540    sp<Camera> camera = get_native_camera(env, thiz, NULL);
541    if (camera == 0) return;
542
543    sp<Surface> surface = NULL;
544    if (jSurface != NULL) {
545        surface = reinterpret_cast<Surface*>(env->GetIntField(jSurface, fields.surface));
546    }
547    if (camera->setPreviewDisplay(surface) != NO_ERROR) {
548        jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed");
549    }
550}
551
552static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
553        jobject thiz, jobject jSurfaceTexture)
554{
555    LOGV("setPreviewTexture");
556    sp<Camera> camera = get_native_camera(env, thiz, NULL);
557    if (camera == 0) return;
558
559    sp<SurfaceTexture> surfaceTexture = NULL;
560    if (jSurfaceTexture != NULL) {
561        surfaceTexture = reinterpret_cast<SurfaceTexture*>(env->GetIntField(
562                jSurfaceTexture, fields.surfaceTexture));
563    }
564    if (camera->setPreviewTexture(surfaceTexture) != NO_ERROR) {
565        jniThrowException(env, "java/io/IOException",
566                "setPreviewTexture failed");
567    }
568}
569
570static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
571{
572    LOGV("startPreview");
573    sp<Camera> camera = get_native_camera(env, thiz, NULL);
574    if (camera == 0) return;
575
576    if (camera->startPreview() != NO_ERROR) {
577        jniThrowRuntimeException(env, "startPreview failed");
578        return;
579    }
580}
581
582static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
583{
584    LOGV("stopPreview");
585    sp<Camera> c = get_native_camera(env, thiz, NULL);
586    if (c == 0) return;
587
588    c->stopPreview();
589}
590
591static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
592{
593    LOGV("previewEnabled");
594    sp<Camera> c = get_native_camera(env, thiz, NULL);
595    if (c == 0) return false;
596
597    return c->previewEnabled();
598}
599
600static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
601{
602    LOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
603    // Important: Only install preview_callback if the Java code has called
604    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
605    // each preview frame for nothing.
606    JNICameraContext* context;
607    sp<Camera> camera = get_native_camera(env, thiz, &context);
608    if (camera == 0) return;
609
610    // setCallbackMode will take care of setting the context flags and calling
611    // camera->setPreviewCallbackFlags within a mutex for us.
612    context->setCallbackMode(env, installed, manualBuffer);
613}
614
615static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
616    LOGV("addCallbackBuffer: 0x%x", msgType);
617
618    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
619
620    if (context != NULL) {
621        context->addCallbackBuffer(env, bytes, msgType);
622    }
623}
624
625static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
626{
627    LOGV("autoFocus");
628    JNICameraContext* context;
629    sp<Camera> c = get_native_camera(env, thiz, &context);
630    if (c == 0) return;
631
632    if (c->autoFocus() != NO_ERROR) {
633        jniThrowRuntimeException(env, "autoFocus failed");
634    }
635}
636
637static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
638{
639    LOGV("cancelAutoFocus");
640    JNICameraContext* context;
641    sp<Camera> c = get_native_camera(env, thiz, &context);
642    if (c == 0) return;
643
644    if (c->cancelAutoFocus() != NO_ERROR) {
645        jniThrowRuntimeException(env, "cancelAutoFocus failed");
646    }
647}
648
649static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
650{
651    LOGV("takePicture");
652    JNICameraContext* context;
653    sp<Camera> camera = get_native_camera(env, thiz, &context);
654    if (camera == 0) return;
655
656    /*
657     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
658     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
659     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
660     * is enabled to receive the callback notification but no data.
661     *
662     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
663     * Java application.
664     */
665    if (msgType & CAMERA_MSG_RAW_IMAGE) {
666        LOGV("Enable raw image callback buffer");
667        if (!context->isRawImageCallbackBufferAvailable()) {
668            LOGV("Enable raw image notification, since no callback buffer exists");
669            msgType &= ~CAMERA_MSG_RAW_IMAGE;
670            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
671        }
672    }
673
674    if (camera->takePicture(msgType) != NO_ERROR) {
675        jniThrowRuntimeException(env, "takePicture failed");
676        return;
677    }
678}
679
680static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
681{
682    LOGV("setParameters");
683    sp<Camera> camera = get_native_camera(env, thiz, NULL);
684    if (camera == 0) return;
685
686    const jchar* str = env->GetStringCritical(params, 0);
687    String8 params8;
688    if (params) {
689        params8 = String8(str, env->GetStringLength(params));
690        env->ReleaseStringCritical(params, str);
691    }
692    if (camera->setParameters(params8) != NO_ERROR) {
693        jniThrowRuntimeException(env, "setParameters failed");
694        return;
695    }
696}
697
698static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
699{
700    LOGV("getParameters");
701    sp<Camera> camera = get_native_camera(env, thiz, NULL);
702    if (camera == 0) return 0;
703
704    return env->NewStringUTF(camera->getParameters().string());
705}
706
707static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
708{
709    LOGV("reconnect");
710    sp<Camera> camera = get_native_camera(env, thiz, NULL);
711    if (camera == 0) return;
712
713    if (camera->reconnect() != NO_ERROR) {
714        jniThrowException(env, "java/io/IOException", "reconnect failed");
715        return;
716    }
717}
718
719static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
720{
721    LOGV("lock");
722    sp<Camera> camera = get_native_camera(env, thiz, NULL);
723    if (camera == 0) return;
724
725    if (camera->lock() != NO_ERROR) {
726        jniThrowRuntimeException(env, "lock failed");
727    }
728}
729
730static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
731{
732    LOGV("unlock");
733    sp<Camera> camera = get_native_camera(env, thiz, NULL);
734    if (camera == 0) return;
735
736    if (camera->unlock() != NO_ERROR) {
737        jniThrowRuntimeException(env, "unlock failed");
738    }
739}
740
741static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
742{
743    LOGV("startSmoothZoom");
744    sp<Camera> camera = get_native_camera(env, thiz, NULL);
745    if (camera == 0) return;
746
747    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
748    if (rc == BAD_VALUE) {
749        char msg[64];
750        sprintf(msg, "invalid zoom value=%d", value);
751        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
752    } else if (rc != NO_ERROR) {
753        jniThrowRuntimeException(env, "start smooth zoom failed");
754    }
755}
756
757static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
758{
759    LOGV("stopSmoothZoom");
760    sp<Camera> camera = get_native_camera(env, thiz, NULL);
761    if (camera == 0) return;
762
763    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
764        jniThrowRuntimeException(env, "stop smooth zoom failed");
765    }
766}
767
768static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
769        jint value)
770{
771    LOGV("setDisplayOrientation");
772    sp<Camera> camera = get_native_camera(env, thiz, NULL);
773    if (camera == 0) return;
774
775    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
776        jniThrowRuntimeException(env, "set display orientation failed");
777    }
778}
779
780static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
781        jint type)
782{
783    LOGV("startFaceDetection");
784    JNICameraContext* context;
785    sp<Camera> camera = get_native_camera(env, thiz, &context);
786    if (camera == 0) return;
787
788    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
789    if (rc == BAD_VALUE) {
790        char msg[64];
791        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
792        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
793    } else if (rc != NO_ERROR) {
794        jniThrowRuntimeException(env, "start face detection failed");
795    }
796}
797
798static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
799{
800    LOGV("stopFaceDetection");
801    sp<Camera> camera = get_native_camera(env, thiz, NULL);
802    if (camera == 0) return;
803
804    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
805        jniThrowRuntimeException(env, "stop face detection failed");
806    }
807}
808
809//-------------------------------------------------
810
811static JNINativeMethod camMethods[] = {
812  { "getNumberOfCameras",
813    "()I",
814    (void *)android_hardware_Camera_getNumberOfCameras },
815  { "getCameraInfo",
816    "(ILandroid/hardware/Camera$CameraInfo;)V",
817    (void*)android_hardware_Camera_getCameraInfo },
818  { "native_setup",
819    "(Ljava/lang/Object;I)V",
820    (void*)android_hardware_Camera_native_setup },
821  { "native_release",
822    "()V",
823    (void*)android_hardware_Camera_release },
824  { "setPreviewDisplay",
825    "(Landroid/view/Surface;)V",
826    (void *)android_hardware_Camera_setPreviewDisplay },
827  { "setPreviewTexture",
828    "(Landroid/graphics/SurfaceTexture;)V",
829    (void *)android_hardware_Camera_setPreviewTexture },
830  { "startPreview",
831    "()V",
832    (void *)android_hardware_Camera_startPreview },
833  { "_stopPreview",
834    "()V",
835    (void *)android_hardware_Camera_stopPreview },
836  { "previewEnabled",
837    "()Z",
838    (void *)android_hardware_Camera_previewEnabled },
839  { "setHasPreviewCallback",
840    "(ZZ)V",
841    (void *)android_hardware_Camera_setHasPreviewCallback },
842  { "_addCallbackBuffer",
843    "([BI)V",
844    (void *)android_hardware_Camera_addCallbackBuffer },
845  { "native_autoFocus",
846    "()V",
847    (void *)android_hardware_Camera_autoFocus },
848  { "native_cancelAutoFocus",
849    "()V",
850    (void *)android_hardware_Camera_cancelAutoFocus },
851  { "native_takePicture",
852    "(I)V",
853    (void *)android_hardware_Camera_takePicture },
854  { "native_setParameters",
855    "(Ljava/lang/String;)V",
856    (void *)android_hardware_Camera_setParameters },
857  { "native_getParameters",
858    "()Ljava/lang/String;",
859    (void *)android_hardware_Camera_getParameters },
860  { "reconnect",
861    "()V",
862    (void*)android_hardware_Camera_reconnect },
863  { "lock",
864    "()V",
865    (void*)android_hardware_Camera_lock },
866  { "unlock",
867    "()V",
868    (void*)android_hardware_Camera_unlock },
869  { "startSmoothZoom",
870    "(I)V",
871    (void *)android_hardware_Camera_startSmoothZoom },
872  { "stopSmoothZoom",
873    "()V",
874    (void *)android_hardware_Camera_stopSmoothZoom },
875  { "setDisplayOrientation",
876    "(I)V",
877    (void *)android_hardware_Camera_setDisplayOrientation },
878  { "_startFaceDetection",
879    "(I)V",
880    (void *)android_hardware_Camera_startFaceDetection },
881  { "_stopFaceDetection",
882    "()V",
883    (void *)android_hardware_Camera_stopFaceDetection},
884};
885
886struct field {
887    const char *class_name;
888    const char *field_name;
889    const char *field_type;
890    jfieldID   *jfield;
891};
892
893static int find_fields(JNIEnv *env, field *fields, int count)
894{
895    for (int i = 0; i < count; i++) {
896        field *f = &fields[i];
897        jclass clazz = env->FindClass(f->class_name);
898        if (clazz == NULL) {
899            LOGE("Can't find %s", f->class_name);
900            return -1;
901        }
902
903        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
904        if (field == NULL) {
905            LOGE("Can't find %s.%s", f->class_name, f->field_name);
906            return -1;
907        }
908
909        *(f->jfield) = field;
910    }
911
912    return 0;
913}
914
915// Get all the required offsets in java class and register native functions
916int register_android_hardware_Camera(JNIEnv *env)
917{
918    field fields_to_find[] = {
919        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
920        { "android/view/Surface",    ANDROID_VIEW_SURFACE_JNI_ID, "I", &fields.surface },
921        { "android/graphics/SurfaceTexture",
922          ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I", &fields.surfaceTexture },
923        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
924        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
925        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
926        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
927        { "android/graphics/Rect", "left", "I", &fields.rect_left },
928        { "android/graphics/Rect", "top", "I", &fields.rect_top },
929        { "android/graphics/Rect", "right", "I", &fields.rect_right },
930        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
931    };
932
933    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
934        return -1;
935
936    jclass clazz = env->FindClass("android/hardware/Camera");
937    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
938                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
939    if (fields.post_event == NULL) {
940        LOGE("Can't find android/hardware/Camera.postEventFromNative");
941        return -1;
942    }
943
944    clazz = env->FindClass("android/graphics/Rect");
945    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
946    if (fields.rect_constructor == NULL) {
947        LOGE("Can't find android/graphics/Rect.Rect()");
948        return -1;
949    }
950
951    clazz = env->FindClass("android/hardware/Camera$Face");
952    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
953    if (fields.face_constructor == NULL) {
954        LOGE("Can't find android/hardware/Camera$Face.Face()");
955        return -1;
956    }
957
958    // Register native functions
959    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
960                                              camMethods, NELEM(camMethods));
961}
962