android_hardware_Camera.cpp revision 52a9a10b6b8c7b7a9f97777541841b94d4fd9754 
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#include <android_runtime/android_graphics_SurfaceTexture.h>
26#include <android_runtime/android_view_Surface.h>
27
28#include <cutils/properties.h>
29#include <utils/Vector.h>
30
31#include <gui/GLConsumer.h>
32#include <gui/Surface.h>
33#include <camera/Camera.h>
34#include <binder/IMemory.h>
35
36using namespace android;
37
38struct fields_t {
39    jfieldID    context;
40    jfieldID    facing;
41    jfieldID    orientation;
42    jfieldID    canDisableShutterSound;
43    jfieldID    face_rect;
44    jfieldID    face_score;
45    jfieldID    rect_left;
46    jfieldID    rect_top;
47    jfieldID    rect_right;
48    jfieldID    rect_bottom;
49    jmethodID   post_event;
50    jmethodID   rect_constructor;
51    jmethodID   face_constructor;
52};
53
54static fields_t fields;
55static Mutex sLock;
56
57// provides persistent context for calls from native code to Java
58class JNICameraContext: public CameraListener
59{
60public:
61    JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera);
62    ~JNICameraContext() { release(); }
63    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2);
64    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr,
65                          camera_frame_metadata_t *metadata);
66    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
67    void postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata);
68    void addCallbackBuffer(JNIEnv *env, jbyteArray cbb, int msgType);
69    void setCallbackMode(JNIEnv *env, bool installed, bool manualMode);
70    sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; }
71    bool isRawImageCallbackBufferAvailable() const;
72    void release();
73
74private:
75    void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType);
76    void clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers);
77    void clearCallbackBuffers_l(JNIEnv *env);
78    jbyteArray getCallbackBuffer(JNIEnv *env, Vector<jbyteArray> *buffers, size_t bufferSize);
79
80    jobject     mCameraJObjectWeak;     // weak reference to java object
81    jclass      mCameraJClass;          // strong reference to java class
82    sp<Camera>  mCamera;                // strong reference to native object
83    jclass      mFaceClass;  // strong reference to Face class
84    jclass      mRectClass;  // strong reference to Rect class
85    Mutex       mLock;
86
87    /*
88     * Global reference application-managed raw image buffer queue.
89     *
90     * Manual-only mode is supported for raw image callbacks, which is
91     * set whenever method addCallbackBuffer() with msgType =
92     * CAMERA_MSG_RAW_IMAGE is called; otherwise, null is returned
93     * with raw image callbacks.
94     */
95    Vector<jbyteArray> mRawImageCallbackBuffers;
96
97    /*
98     * Application-managed preview buffer queue and the flags
99     * associated with the usage of the preview buffer callback.
100     */
101    Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[]
102    bool mManualBufferMode;              // Whether to use application managed buffers.
103    bool mManualCameraCallbackSet;       // Whether the callback has been set, used to
104                                         // reduce unnecessary calls to set the callback.
105};
106
107bool JNICameraContext::isRawImageCallbackBufferAvailable() const
108{
109    return !mRawImageCallbackBuffers.isEmpty();
110}
111
112sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
113{
114    sp<Camera> camera;
115    Mutex::Autolock _l(sLock);
116    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
117    if (context != NULL) {
118        camera = context->getCamera();
119    }
120    ALOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
121    if (camera == 0) {
122        jniThrowRuntimeException(env, "Method called after release()");
123    }
124
125    if (pContext != NULL) *pContext = context;
126    return camera;
127}
128
129JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera)
130{
131    mCameraJObjectWeak = env->NewGlobalRef(weak_this);
132    mCameraJClass = (jclass)env->NewGlobalRef(clazz);
133    mCamera = camera;
134
135    jclass faceClazz = env->FindClass("android/hardware/Camera$Face");
136    mFaceClass = (jclass) env->NewGlobalRef(faceClazz);
137
138    jclass rectClazz = env->FindClass("android/graphics/Rect");
139    mRectClass = (jclass) env->NewGlobalRef(rectClazz);
140
141    mManualBufferMode = false;
142    mManualCameraCallbackSet = false;
143}
144
145void JNICameraContext::release()
146{
147    ALOGV("release");
148    Mutex::Autolock _l(mLock);
149    JNIEnv *env = AndroidRuntime::getJNIEnv();
150
151    if (mCameraJObjectWeak != NULL) {
152        env->DeleteGlobalRef(mCameraJObjectWeak);
153        mCameraJObjectWeak = NULL;
154    }
155    if (mCameraJClass != NULL) {
156        env->DeleteGlobalRef(mCameraJClass);
157        mCameraJClass = NULL;
158    }
159    if (mFaceClass != NULL) {
160        env->DeleteGlobalRef(mFaceClass);
161        mFaceClass = NULL;
162    }
163    if (mRectClass != NULL) {
164        env->DeleteGlobalRef(mRectClass);
165        mRectClass = NULL;
166    }
167    clearCallbackBuffers_l(env);
168    mCamera.clear();
169}
170
171void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2)
172{
173    ALOGV("notify");
174
175    // VM pointer will be NULL if object is released
176    Mutex::Autolock _l(mLock);
177    if (mCameraJObjectWeak == NULL) {
178        ALOGW("callback on dead camera object");
179        return;
180    }
181    JNIEnv *env = AndroidRuntime::getJNIEnv();
182
183    /*
184     * If the notification or msgType is CAMERA_MSG_RAW_IMAGE_NOTIFY, change it
185     * to CAMERA_MSG_RAW_IMAGE since CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed
186     * to the Java app.
187     */
188    if (msgType == CAMERA_MSG_RAW_IMAGE_NOTIFY) {
189        msgType = CAMERA_MSG_RAW_IMAGE;
190    }
191
192    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
193            mCameraJObjectWeak, msgType, ext1, ext2, NULL);
194}
195
196jbyteArray JNICameraContext::getCallbackBuffer(
197        JNIEnv* env, Vector<jbyteArray>* buffers, size_t bufferSize)
198{
199    jbyteArray obj = NULL;
200
201    // Vector access should be protected by lock in postData()
202    if (!buffers->isEmpty()) {
203        ALOGV("Using callback buffer from queue of length %d", buffers->size());
204        jbyteArray globalBuffer = buffers->itemAt(0);
205        buffers->removeAt(0);
206
207        obj = (jbyteArray)env->NewLocalRef(globalBuffer);
208        env->DeleteGlobalRef(globalBuffer);
209
210        if (obj != NULL) {
211            jsize bufferLength = env->GetArrayLength(obj);
212            if ((int)bufferLength < (int)bufferSize) {
213                ALOGE("Callback buffer was too small! Expected %d bytes, but got %d bytes!",
214                    bufferSize, bufferLength);
215                env->DeleteLocalRef(obj);
216                return NULL;
217            }
218        }
219    }
220
221    return obj;
222}
223
224void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType)
225{
226    jbyteArray obj = NULL;
227
228    // allocate Java byte array and copy data
229    if (dataPtr != NULL) {
230        ssize_t offset;
231        size_t size;
232        sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size);
233        ALOGV("copyAndPost: off=%ld, size=%d", offset, size);
234        uint8_t *heapBase = (uint8_t*)heap->base();
235
236        if (heapBase != NULL) {
237            const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset);
238
239            if (msgType == CAMERA_MSG_RAW_IMAGE) {
240                obj = getCallbackBuffer(env, &mRawImageCallbackBuffers, size);
241            } else if (msgType == CAMERA_MSG_PREVIEW_FRAME && mManualBufferMode) {
242                obj = getCallbackBuffer(env, &mCallbackBuffers, size);
243
244                if (mCallbackBuffers.isEmpty()) {
245                    ALOGV("Out of buffers, clearing callback!");
246                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
247                    mManualCameraCallbackSet = false;
248
249                    if (obj == NULL) {
250                        return;
251                    }
252                }
253            } else {
254                ALOGV("Allocating callback buffer");
255                obj = env->NewByteArray(size);
256            }
257
258            if (obj == NULL) {
259                ALOGE("Couldn't allocate byte array for JPEG data");
260                env->ExceptionClear();
261            } else {
262                env->SetByteArrayRegion(obj, 0, size, data);
263            }
264        } else {
265            ALOGE("image heap is NULL");
266        }
267    }
268
269    // post image data to Java
270    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
271            mCameraJObjectWeak, msgType, 0, 0, obj);
272    if (obj) {
273        env->DeleteLocalRef(obj);
274    }
275}
276
277void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr,
278                                camera_frame_metadata_t *metadata)
279{
280    // VM pointer will be NULL if object is released
281    Mutex::Autolock _l(mLock);
282    JNIEnv *env = AndroidRuntime::getJNIEnv();
283    if (mCameraJObjectWeak == NULL) {
284        ALOGW("callback on dead camera object");
285        return;
286    }
287
288    int32_t dataMsgType = msgType & ~CAMERA_MSG_PREVIEW_METADATA;
289
290    // return data based on callback type
291    switch (dataMsgType) {
292        case CAMERA_MSG_VIDEO_FRAME:
293            // should never happen
294            break;
295
296        // For backward-compatibility purpose, if there is no callback
297        // buffer for raw image, the callback returns null.
298        case CAMERA_MSG_RAW_IMAGE:
299            ALOGV("rawCallback");
300            if (mRawImageCallbackBuffers.isEmpty()) {
301                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
302                        mCameraJObjectWeak, dataMsgType, 0, 0, NULL);
303            } else {
304                copyAndPost(env, dataPtr, dataMsgType);
305            }
306            break;
307
308        // There is no data.
309        case 0:
310            break;
311
312        default:
313            ALOGV("dataCallback(%d, %p)", dataMsgType, dataPtr.get());
314            copyAndPost(env, dataPtr, dataMsgType);
315            break;
316    }
317
318    // post frame metadata to Java
319    if (metadata && (msgType & CAMERA_MSG_PREVIEW_METADATA)) {
320        postMetadata(env, CAMERA_MSG_PREVIEW_METADATA, metadata);
321    }
322}
323
324void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
325{
326    // TODO: plumb up to Java. For now, just drop the timestamp
327    postData(msgType, dataPtr, NULL);
328}
329
330void JNICameraContext::postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata)
331{
332    jobjectArray obj = NULL;
333    obj = (jobjectArray) env->NewObjectArray(metadata->number_of_faces,
334                                             mFaceClass, NULL);
335    if (obj == NULL) {
336        ALOGE("Couldn't allocate face metadata array");
337        return;
338    }
339
340    for (int i = 0; i < metadata->number_of_faces; i++) {
341        jobject face = env->NewObject(mFaceClass, fields.face_constructor);
342        env->SetObjectArrayElement(obj, i, face);
343
344        jobject rect = env->NewObject(mRectClass, fields.rect_constructor);
345        env->SetIntField(rect, fields.rect_left, metadata->faces[i].rect[0]);
346        env->SetIntField(rect, fields.rect_top, metadata->faces[i].rect[1]);
347        env->SetIntField(rect, fields.rect_right, metadata->faces[i].rect[2]);
348        env->SetIntField(rect, fields.rect_bottom, metadata->faces[i].rect[3]);
349
350        env->SetObjectField(face, fields.face_rect, rect);
351        env->SetIntField(face, fields.face_score, metadata->faces[i].score);
352
353        env->DeleteLocalRef(face);
354        env->DeleteLocalRef(rect);
355    }
356    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
357            mCameraJObjectWeak, msgType, 0, 0, obj);
358    env->DeleteLocalRef(obj);
359}
360
361void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
362{
363    Mutex::Autolock _l(mLock);
364    mManualBufferMode = manualMode;
365    mManualCameraCallbackSet = false;
366
367    // In order to limit the over usage of binder threads, all non-manual buffer
368    // callbacks use CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
369    //
370    // Continuous callbacks will have the callback re-registered from handleMessage.
371    // Manual buffer mode will operate as fast as possible, relying on the finite supply
372    // of buffers for throttling.
373
374    if (!installed) {
375        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
376        clearCallbackBuffers_l(env, &mCallbackBuffers);
377    } else if (mManualBufferMode) {
378        if (!mCallbackBuffers.isEmpty()) {
379            mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
380            mManualCameraCallbackSet = true;
381        }
382    } else {
383        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
384        clearCallbackBuffers_l(env, &mCallbackBuffers);
385    }
386}
387
388void JNICameraContext::addCallbackBuffer(
389        JNIEnv *env, jbyteArray cbb, int msgType)
390{
391    ALOGV("addCallbackBuffer: 0x%x", msgType);
392    if (cbb != NULL) {
393        Mutex::Autolock _l(mLock);
394        switch (msgType) {
395            case CAMERA_MSG_PREVIEW_FRAME: {
396                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
397                mCallbackBuffers.push(callbackBuffer);
398
399                ALOGV("Adding callback buffer to queue, %d total",
400                        mCallbackBuffers.size());
401
402                // We want to make sure the camera knows we're ready for the
403                // next frame. This may have come unset had we not had a
404                // callbackbuffer ready for it last time.
405                if (mManualBufferMode && !mManualCameraCallbackSet) {
406                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
407                    mManualCameraCallbackSet = true;
408                }
409                break;
410            }
411            case CAMERA_MSG_RAW_IMAGE: {
412                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
413                mRawImageCallbackBuffers.push(callbackBuffer);
414                break;
415            }
416            default: {
417                jniThrowException(env,
418                        "java/lang/IllegalArgumentException",
419                        "Unsupported message type");
420                return;
421            }
422        }
423    } else {
424       ALOGE("Null byte array!");
425    }
426}
427
428void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
429{
430    clearCallbackBuffers_l(env, &mCallbackBuffers);
431    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
432}
433
434void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
435    ALOGV("Clearing callback buffers, %d remained", buffers->size());
436    while (!buffers->isEmpty()) {
437        env->DeleteGlobalRef(buffers->top());
438        buffers->pop();
439    }
440}
441
442static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
443{
444    return Camera::getNumberOfCameras();
445}
446
447static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
448    jint cameraId, jobject info_obj)
449{
450    CameraInfo cameraInfo;
451    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
452    if (rc != NO_ERROR) {
453        jniThrowRuntimeException(env, "Fail to get camera info");
454        return;
455    }
456    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
457    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
458
459    char value[PROPERTY_VALUE_MAX];
460    property_get("ro.camera.sound.forced", value, "0");
461    jboolean canDisableShutterSound = (strncmp(value, "0", 2) == 0);
462    env->SetBooleanField(info_obj, fields.canDisableShutterSound,
463            canDisableShutterSound);
464}
465
466// connect to camera service
467static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
468    jobject weak_this, jint cameraId, jstring clientPackageName)
469{
470    // Convert jstring to String16
471    const char16_t *rawClientName = env->GetStringChars(clientPackageName, NULL);
472    jsize rawClientNameLen = env->GetStringLength(clientPackageName);
473    String16 clientName(rawClientName, rawClientNameLen);
474    env->ReleaseStringChars(clientPackageName, rawClientName);
475
476    sp<Camera> camera = Camera::connect(cameraId, clientName,
477            Camera::USE_CALLING_UID);
478
479    if (camera == NULL) {
480        jniThrowRuntimeException(env, "Fail to connect to camera service");
481        return;
482    }
483
484    // make sure camera hardware is alive
485    if (camera->getStatus() != NO_ERROR) {
486        jniThrowRuntimeException(env, "Camera initialization failed");
487        return;
488    }
489
490    jclass clazz = env->GetObjectClass(thiz);
491    if (clazz == NULL) {
492        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
493        return;
494    }
495
496    // We use a weak reference so the Camera object can be garbage collected.
497    // The reference is only used as a proxy for callbacks.
498    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
499    context->incStrong((void*)android_hardware_Camera_native_setup);
500    camera->setListener(context);
501
502    // save context in opaque field
503    env->SetIntField(thiz, fields.context, (int)context.get());
504}
505
506// disconnect from camera service
507// It's okay to call this when the native camera context is already null.
508// This handles the case where the user has called release() and the
509// finalizer is invoked later.
510static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
511{
512    // TODO: Change to ALOGV
513    ALOGV("release camera");
514    JNICameraContext* context = NULL;
515    sp<Camera> camera;
516    {
517        Mutex::Autolock _l(sLock);
518        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
519
520        // Make sure we do not attempt to callback on a deleted Java object.
521        env->SetIntField(thiz, fields.context, 0);
522    }
523
524    // clean up if release has not been called before
525    if (context != NULL) {
526        camera = context->getCamera();
527        context->release();
528        ALOGV("native_release: context=%p camera=%p", context, camera.get());
529
530        // clear callbacks
531        if (camera != NULL) {
532            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
533            camera->disconnect();
534        }
535
536        // remove context to prevent further Java access
537        context->decStrong((void*)android_hardware_Camera_native_setup);
538    }
539}
540
541static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface)
542{
543    ALOGV("setPreviewDisplay");
544    sp<Camera> camera = get_native_camera(env, thiz, NULL);
545    if (camera == 0) return;
546
547    sp<IGraphicBufferProducer> gbp;
548    sp<Surface> surface;
549    if (jSurface) {
550        surface = android_view_Surface_getSurface(env, jSurface);
551        if (surface != NULL) {
552            gbp = surface->getIGraphicBufferProducer();
553        }
554    }
555
556    if (camera->setPreviewTexture(gbp) != NO_ERROR) {
557        jniThrowException(env, "java/io/IOException", "setPreviewTexture failed");
558    }
559}
560
561static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
562        jobject thiz, jobject jSurfaceTexture)
563{
564    ALOGV("setPreviewTexture");
565    sp<Camera> camera = get_native_camera(env, thiz, NULL);
566    if (camera == 0) return;
567
568    sp<IGraphicBufferProducer> producer = NULL;
569    if (jSurfaceTexture != NULL) {
570        producer = SurfaceTexture_getProducer(env, jSurfaceTexture);
571        if (producer == NULL) {
572            jniThrowException(env, "java/lang/IllegalArgumentException",
573                    "SurfaceTexture already released in setPreviewTexture");
574            return;
575        }
576
577    }
578
579    if (camera->setPreviewTexture(producer) != NO_ERROR) {
580        jniThrowException(env, "java/io/IOException",
581                "setPreviewTexture failed");
582    }
583}
584
585static void android_hardware_Camera_setPreviewCallbackSurface(JNIEnv *env,
586        jobject thiz, jobject jSurface)
587{
588    ALOGV("setPreviewCallbackSurface");
589    JNICameraContext* context;
590    sp<Camera> camera = get_native_camera(env, thiz, &context);
591    if (camera == 0) return;
592
593    sp<IGraphicBufferProducer> gbp;
594    sp<Surface> surface;
595    if (jSurface) {
596        surface = android_view_Surface_getSurface(env, jSurface);
597        if (surface != NULL) {
598            gbp = surface->getIGraphicBufferProducer();
599        }
600    }
601    // Clear out normal preview callbacks
602    context->setCallbackMode(env, false, false);
603    // Then set up callback surface
604    if (camera->setPreviewCallbackTarget(gbp) != NO_ERROR) {
605        jniThrowException(env, "java/io/IOException", "setPreviewCallbackTarget failed");
606    }
607}
608
609static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
610{
611    ALOGV("startPreview");
612    sp<Camera> camera = get_native_camera(env, thiz, NULL);
613    if (camera == 0) return;
614
615    if (camera->startPreview() != NO_ERROR) {
616        jniThrowRuntimeException(env, "startPreview failed");
617        return;
618    }
619}
620
621static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
622{
623    ALOGV("stopPreview");
624    sp<Camera> c = get_native_camera(env, thiz, NULL);
625    if (c == 0) return;
626
627    c->stopPreview();
628}
629
630static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
631{
632    ALOGV("previewEnabled");
633    sp<Camera> c = get_native_camera(env, thiz, NULL);
634    if (c == 0) return false;
635
636    return c->previewEnabled();
637}
638
639static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
640{
641    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
642    // Important: Only install preview_callback if the Java code has called
643    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
644    // each preview frame for nothing.
645    JNICameraContext* context;
646    sp<Camera> camera = get_native_camera(env, thiz, &context);
647    if (camera == 0) return;
648
649    // setCallbackMode will take care of setting the context flags and calling
650    // camera->setPreviewCallbackFlags within a mutex for us.
651    context->setCallbackMode(env, installed, manualBuffer);
652}
653
654static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
655    ALOGV("addCallbackBuffer: 0x%x", msgType);
656
657    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
658
659    if (context != NULL) {
660        context->addCallbackBuffer(env, bytes, msgType);
661    }
662}
663
664static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
665{
666    ALOGV("autoFocus");
667    JNICameraContext* context;
668    sp<Camera> c = get_native_camera(env, thiz, &context);
669    if (c == 0) return;
670
671    if (c->autoFocus() != NO_ERROR) {
672        jniThrowRuntimeException(env, "autoFocus failed");
673    }
674}
675
676static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
677{
678    ALOGV("cancelAutoFocus");
679    JNICameraContext* context;
680    sp<Camera> c = get_native_camera(env, thiz, &context);
681    if (c == 0) return;
682
683    if (c->cancelAutoFocus() != NO_ERROR) {
684        jniThrowRuntimeException(env, "cancelAutoFocus failed");
685    }
686}
687
688static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
689{
690    ALOGV("takePicture");
691    JNICameraContext* context;
692    sp<Camera> camera = get_native_camera(env, thiz, &context);
693    if (camera == 0) return;
694
695    /*
696     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
697     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
698     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
699     * is enabled to receive the callback notification but no data.
700     *
701     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
702     * Java application.
703     */
704    if (msgType & CAMERA_MSG_RAW_IMAGE) {
705        ALOGV("Enable raw image callback buffer");
706        if (!context->isRawImageCallbackBufferAvailable()) {
707            ALOGV("Enable raw image notification, since no callback buffer exists");
708            msgType &= ~CAMERA_MSG_RAW_IMAGE;
709            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
710        }
711    }
712
713    if (camera->takePicture(msgType) != NO_ERROR) {
714        jniThrowRuntimeException(env, "takePicture failed");
715        return;
716    }
717}
718
719static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
720{
721    ALOGV("setParameters");
722    sp<Camera> camera = get_native_camera(env, thiz, NULL);
723    if (camera == 0) return;
724
725    const jchar* str = env->GetStringCritical(params, 0);
726    String8 params8;
727    if (params) {
728        params8 = String8(str, env->GetStringLength(params));
729        env->ReleaseStringCritical(params, str);
730    }
731    if (camera->setParameters(params8) != NO_ERROR) {
732        jniThrowRuntimeException(env, "setParameters failed");
733        return;
734    }
735}
736
737static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
738{
739    ALOGV("getParameters");
740    sp<Camera> camera = get_native_camera(env, thiz, NULL);
741    if (camera == 0) return 0;
742
743    String8 params8 = camera->getParameters();
744    if (params8.isEmpty()) {
745        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
746        return 0;
747    }
748    return env->NewStringUTF(params8.string());
749}
750
751static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
752{
753    ALOGV("reconnect");
754    sp<Camera> camera = get_native_camera(env, thiz, NULL);
755    if (camera == 0) return;
756
757    if (camera->reconnect() != NO_ERROR) {
758        jniThrowException(env, "java/io/IOException", "reconnect failed");
759        return;
760    }
761}
762
763static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
764{
765    ALOGV("lock");
766    sp<Camera> camera = get_native_camera(env, thiz, NULL);
767    if (camera == 0) return;
768
769    if (camera->lock() != NO_ERROR) {
770        jniThrowRuntimeException(env, "lock failed");
771    }
772}
773
774static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
775{
776    ALOGV("unlock");
777    sp<Camera> camera = get_native_camera(env, thiz, NULL);
778    if (camera == 0) return;
779
780    if (camera->unlock() != NO_ERROR) {
781        jniThrowRuntimeException(env, "unlock failed");
782    }
783}
784
785static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
786{
787    ALOGV("startSmoothZoom");
788    sp<Camera> camera = get_native_camera(env, thiz, NULL);
789    if (camera == 0) return;
790
791    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
792    if (rc == BAD_VALUE) {
793        char msg[64];
794        sprintf(msg, "invalid zoom value=%d", value);
795        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
796    } else if (rc != NO_ERROR) {
797        jniThrowRuntimeException(env, "start smooth zoom failed");
798    }
799}
800
801static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
802{
803    ALOGV("stopSmoothZoom");
804    sp<Camera> camera = get_native_camera(env, thiz, NULL);
805    if (camera == 0) return;
806
807    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
808        jniThrowRuntimeException(env, "stop smooth zoom failed");
809    }
810}
811
812static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
813        jint value)
814{
815    ALOGV("setDisplayOrientation");
816    sp<Camera> camera = get_native_camera(env, thiz, NULL);
817    if (camera == 0) return;
818
819    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
820        jniThrowRuntimeException(env, "set display orientation failed");
821    }
822}
823
824static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
825        jboolean enabled)
826{
827    ALOGV("enableShutterSound");
828    sp<Camera> camera = get_native_camera(env, thiz, NULL);
829    if (camera == 0) return JNI_FALSE;
830
831    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
832    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
833    if (rc == NO_ERROR) {
834        return JNI_TRUE;
835    } else if (rc == PERMISSION_DENIED) {
836        return JNI_FALSE;
837    } else {
838        jniThrowRuntimeException(env, "enable shutter sound failed");
839        return JNI_FALSE;
840    }
841}
842
843static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
844        jint type)
845{
846    ALOGV("startFaceDetection");
847    JNICameraContext* context;
848    sp<Camera> camera = get_native_camera(env, thiz, &context);
849    if (camera == 0) return;
850
851    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
852    if (rc == BAD_VALUE) {
853        char msg[64];
854        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
855        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
856    } else if (rc != NO_ERROR) {
857        jniThrowRuntimeException(env, "start face detection failed");
858    }
859}
860
861static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
862{
863    ALOGV("stopFaceDetection");
864    sp<Camera> camera = get_native_camera(env, thiz, NULL);
865    if (camera == 0) return;
866
867    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
868        jniThrowRuntimeException(env, "stop face detection failed");
869    }
870}
871
872static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
873{
874    ALOGV("enableFocusMoveCallback");
875    sp<Camera> camera = get_native_camera(env, thiz, NULL);
876    if (camera == 0) return;
877
878    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
879        jniThrowRuntimeException(env, "enable focus move callback failed");
880    }
881}
882
883//-------------------------------------------------
884
885static JNINativeMethod camMethods[] = {
886  { "getNumberOfCameras",
887    "()I",
888    (void *)android_hardware_Camera_getNumberOfCameras },
889  { "_getCameraInfo",
890    "(ILandroid/hardware/Camera$CameraInfo;)V",
891    (void*)android_hardware_Camera_getCameraInfo },
892  { "native_setup",
893    "(Ljava/lang/Object;ILjava/lang/String;)V",
894    (void*)android_hardware_Camera_native_setup },
895  { "native_release",
896    "()V",
897    (void*)android_hardware_Camera_release },
898  { "setPreviewDisplay",
899    "(Landroid/view/Surface;)V",
900    (void *)android_hardware_Camera_setPreviewDisplay },
901  { "setPreviewTexture",
902    "(Landroid/graphics/SurfaceTexture;)V",
903    (void *)android_hardware_Camera_setPreviewTexture },
904  { "setPreviewCallbackSurface",
905    "(Landroid/view/Surface;)V",
906    (void *)android_hardware_Camera_setPreviewCallbackSurface },
907  { "startPreview",
908    "()V",
909    (void *)android_hardware_Camera_startPreview },
910  { "_stopPreview",
911    "()V",
912    (void *)android_hardware_Camera_stopPreview },
913  { "previewEnabled",
914    "()Z",
915    (void *)android_hardware_Camera_previewEnabled },
916  { "setHasPreviewCallback",
917    "(ZZ)V",
918    (void *)android_hardware_Camera_setHasPreviewCallback },
919  { "_addCallbackBuffer",
920    "([BI)V",
921    (void *)android_hardware_Camera_addCallbackBuffer },
922  { "native_autoFocus",
923    "()V",
924    (void *)android_hardware_Camera_autoFocus },
925  { "native_cancelAutoFocus",
926    "()V",
927    (void *)android_hardware_Camera_cancelAutoFocus },
928  { "native_takePicture",
929    "(I)V",
930    (void *)android_hardware_Camera_takePicture },
931  { "native_setParameters",
932    "(Ljava/lang/String;)V",
933    (void *)android_hardware_Camera_setParameters },
934  { "native_getParameters",
935    "()Ljava/lang/String;",
936    (void *)android_hardware_Camera_getParameters },
937  { "reconnect",
938    "()V",
939    (void*)android_hardware_Camera_reconnect },
940  { "lock",
941    "()V",
942    (void*)android_hardware_Camera_lock },
943  { "unlock",
944    "()V",
945    (void*)android_hardware_Camera_unlock },
946  { "startSmoothZoom",
947    "(I)V",
948    (void *)android_hardware_Camera_startSmoothZoom },
949  { "stopSmoothZoom",
950    "()V",
951    (void *)android_hardware_Camera_stopSmoothZoom },
952  { "setDisplayOrientation",
953    "(I)V",
954    (void *)android_hardware_Camera_setDisplayOrientation },
955  { "_enableShutterSound",
956    "(Z)Z",
957    (void *)android_hardware_Camera_enableShutterSound },
958  { "_startFaceDetection",
959    "(I)V",
960    (void *)android_hardware_Camera_startFaceDetection },
961  { "_stopFaceDetection",
962    "()V",
963    (void *)android_hardware_Camera_stopFaceDetection},
964  { "enableFocusMoveCallback",
965    "(I)V",
966    (void *)android_hardware_Camera_enableFocusMoveCallback},
967};
968
969struct field {
970    const char *class_name;
971    const char *field_name;
972    const char *field_type;
973    jfieldID   *jfield;
974};
975
976static int find_fields(JNIEnv *env, field *fields, int count)
977{
978    for (int i = 0; i < count; i++) {
979        field *f = &fields[i];
980        jclass clazz = env->FindClass(f->class_name);
981        if (clazz == NULL) {
982            ALOGE("Can't find %s", f->class_name);
983            return -1;
984        }
985
986        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
987        if (field == NULL) {
988            ALOGE("Can't find %s.%s", f->class_name, f->field_name);
989            return -1;
990        }
991
992        *(f->jfield) = field;
993    }
994
995    return 0;
996}
997
998// Get all the required offsets in java class and register native functions
999int register_android_hardware_Camera(JNIEnv *env)
1000{
1001    field fields_to_find[] = {
1002        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
1003        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
1004        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
1005        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
1006          &fields.canDisableShutterSound },
1007        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
1008        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
1009        { "android/graphics/Rect", "left", "I", &fields.rect_left },
1010        { "android/graphics/Rect", "top", "I", &fields.rect_top },
1011        { "android/graphics/Rect", "right", "I", &fields.rect_right },
1012        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
1013    };
1014
1015    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
1016        return -1;
1017
1018    jclass clazz = env->FindClass("android/hardware/Camera");
1019    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
1020                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
1021    if (fields.post_event == NULL) {
1022        ALOGE("Can't find android/hardware/Camera.postEventFromNative");
1023        return -1;
1024    }
1025
1026    clazz = env->FindClass("android/graphics/Rect");
1027    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
1028    if (fields.rect_constructor == NULL) {
1029        ALOGE("Can't find android/graphics/Rect.Rect()");
1030        return -1;
1031    }
1032
1033    clazz = env->FindClass("android/hardware/Camera$Face");
1034    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
1035    if (fields.face_constructor == NULL) {
1036        ALOGE("Can't find android/hardware/Camera$Face.Face()");
1037        return -1;
1038    }
1039
1040    // Register native functions
1041    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
1042                                              camMethods, NELEM(camMethods));
1043}
1044