android_hardware_Camera.cpp revision 4a05f436989a49e06ec762aac9507ad13fcc5e23 
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<BufferQueue> bufferQueue = NULL;
569    if (jSurfaceTexture != NULL) {
570        sp<GLConsumer> surfaceTexture =
571            SurfaceTexture_getSurfaceTexture(env, jSurfaceTexture);
572        if (surfaceTexture != NULL) {
573            bufferQueue = surfaceTexture->getBufferQueue();
574        }
575        else {
576            jniThrowException(env, "java/lang/IllegalArgumentException",
577                    "SurfaceTexture already released in setPreviewTexture");
578            return;
579        }
580
581    }
582
583    if (camera->setPreviewTexture(bufferQueue) != NO_ERROR) {
584        jniThrowException(env, "java/io/IOException",
585                "setPreviewTexture failed");
586    }
587}
588
589static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
590{
591    ALOGV("startPreview");
592    sp<Camera> camera = get_native_camera(env, thiz, NULL);
593    if (camera == 0) return;
594
595    if (camera->startPreview() != NO_ERROR) {
596        jniThrowRuntimeException(env, "startPreview failed");
597        return;
598    }
599}
600
601static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
602{
603    ALOGV("stopPreview");
604    sp<Camera> c = get_native_camera(env, thiz, NULL);
605    if (c == 0) return;
606
607    c->stopPreview();
608}
609
610static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
611{
612    ALOGV("previewEnabled");
613    sp<Camera> c = get_native_camera(env, thiz, NULL);
614    if (c == 0) return false;
615
616    return c->previewEnabled();
617}
618
619static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
620{
621    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
622    // Important: Only install preview_callback if the Java code has called
623    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
624    // each preview frame for nothing.
625    JNICameraContext* context;
626    sp<Camera> camera = get_native_camera(env, thiz, &context);
627    if (camera == 0) return;
628
629    // setCallbackMode will take care of setting the context flags and calling
630    // camera->setPreviewCallbackFlags within a mutex for us.
631    context->setCallbackMode(env, installed, manualBuffer);
632}
633
634static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
635    ALOGV("addCallbackBuffer: 0x%x", msgType);
636
637    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
638
639    if (context != NULL) {
640        context->addCallbackBuffer(env, bytes, msgType);
641    }
642}
643
644static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
645{
646    ALOGV("autoFocus");
647    JNICameraContext* context;
648    sp<Camera> c = get_native_camera(env, thiz, &context);
649    if (c == 0) return;
650
651    if (c->autoFocus() != NO_ERROR) {
652        jniThrowRuntimeException(env, "autoFocus failed");
653    }
654}
655
656static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
657{
658    ALOGV("cancelAutoFocus");
659    JNICameraContext* context;
660    sp<Camera> c = get_native_camera(env, thiz, &context);
661    if (c == 0) return;
662
663    if (c->cancelAutoFocus() != NO_ERROR) {
664        jniThrowRuntimeException(env, "cancelAutoFocus failed");
665    }
666}
667
668static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
669{
670    ALOGV("takePicture");
671    JNICameraContext* context;
672    sp<Camera> camera = get_native_camera(env, thiz, &context);
673    if (camera == 0) return;
674
675    /*
676     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
677     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
678     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
679     * is enabled to receive the callback notification but no data.
680     *
681     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
682     * Java application.
683     */
684    if (msgType & CAMERA_MSG_RAW_IMAGE) {
685        ALOGV("Enable raw image callback buffer");
686        if (!context->isRawImageCallbackBufferAvailable()) {
687            ALOGV("Enable raw image notification, since no callback buffer exists");
688            msgType &= ~CAMERA_MSG_RAW_IMAGE;
689            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
690        }
691    }
692
693    if (camera->takePicture(msgType) != NO_ERROR) {
694        jniThrowRuntimeException(env, "takePicture failed");
695        return;
696    }
697}
698
699static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
700{
701    ALOGV("setParameters");
702    sp<Camera> camera = get_native_camera(env, thiz, NULL);
703    if (camera == 0) return;
704
705    const jchar* str = env->GetStringCritical(params, 0);
706    String8 params8;
707    if (params) {
708        params8 = String8(str, env->GetStringLength(params));
709        env->ReleaseStringCritical(params, str);
710    }
711    if (camera->setParameters(params8) != NO_ERROR) {
712        jniThrowRuntimeException(env, "setParameters failed");
713        return;
714    }
715}
716
717static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
718{
719    ALOGV("getParameters");
720    sp<Camera> camera = get_native_camera(env, thiz, NULL);
721    if (camera == 0) return 0;
722
723    String8 params8 = camera->getParameters();
724    if (params8.isEmpty()) {
725        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
726        return 0;
727    }
728    return env->NewStringUTF(params8.string());
729}
730
731static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
732{
733    ALOGV("reconnect");
734    sp<Camera> camera = get_native_camera(env, thiz, NULL);
735    if (camera == 0) return;
736
737    if (camera->reconnect() != NO_ERROR) {
738        jniThrowException(env, "java/io/IOException", "reconnect failed");
739        return;
740    }
741}
742
743static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
744{
745    ALOGV("lock");
746    sp<Camera> camera = get_native_camera(env, thiz, NULL);
747    if (camera == 0) return;
748
749    if (camera->lock() != NO_ERROR) {
750        jniThrowRuntimeException(env, "lock failed");
751    }
752}
753
754static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
755{
756    ALOGV("unlock");
757    sp<Camera> camera = get_native_camera(env, thiz, NULL);
758    if (camera == 0) return;
759
760    if (camera->unlock() != NO_ERROR) {
761        jniThrowRuntimeException(env, "unlock failed");
762    }
763}
764
765static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
766{
767    ALOGV("startSmoothZoom");
768    sp<Camera> camera = get_native_camera(env, thiz, NULL);
769    if (camera == 0) return;
770
771    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
772    if (rc == BAD_VALUE) {
773        char msg[64];
774        sprintf(msg, "invalid zoom value=%d", value);
775        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
776    } else if (rc != NO_ERROR) {
777        jniThrowRuntimeException(env, "start smooth zoom failed");
778    }
779}
780
781static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
782{
783    ALOGV("stopSmoothZoom");
784    sp<Camera> camera = get_native_camera(env, thiz, NULL);
785    if (camera == 0) return;
786
787    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
788        jniThrowRuntimeException(env, "stop smooth zoom failed");
789    }
790}
791
792static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
793        jint value)
794{
795    ALOGV("setDisplayOrientation");
796    sp<Camera> camera = get_native_camera(env, thiz, NULL);
797    if (camera == 0) return;
798
799    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
800        jniThrowRuntimeException(env, "set display orientation failed");
801    }
802}
803
804static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
805        jboolean enabled)
806{
807    ALOGV("enableShutterSound");
808    sp<Camera> camera = get_native_camera(env, thiz, NULL);
809    if (camera == 0) return JNI_FALSE;
810
811    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
812    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
813    if (rc == NO_ERROR) {
814        return JNI_TRUE;
815    } else if (rc == PERMISSION_DENIED) {
816        return JNI_FALSE;
817    } else {
818        jniThrowRuntimeException(env, "enable shutter sound failed");
819        return JNI_FALSE;
820    }
821}
822
823static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
824        jint type)
825{
826    ALOGV("startFaceDetection");
827    JNICameraContext* context;
828    sp<Camera> camera = get_native_camera(env, thiz, &context);
829    if (camera == 0) return;
830
831    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
832    if (rc == BAD_VALUE) {
833        char msg[64];
834        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
835        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
836    } else if (rc != NO_ERROR) {
837        jniThrowRuntimeException(env, "start face detection failed");
838    }
839}
840
841static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
842{
843    ALOGV("stopFaceDetection");
844    sp<Camera> camera = get_native_camera(env, thiz, NULL);
845    if (camera == 0) return;
846
847    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
848        jniThrowRuntimeException(env, "stop face detection failed");
849    }
850}
851
852static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
853{
854    ALOGV("enableFocusMoveCallback");
855    sp<Camera> camera = get_native_camera(env, thiz, NULL);
856    if (camera == 0) return;
857
858    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
859        jniThrowRuntimeException(env, "enable focus move callback failed");
860    }
861}
862
863//-------------------------------------------------
864
865static JNINativeMethod camMethods[] = {
866  { "getNumberOfCameras",
867    "()I",
868    (void *)android_hardware_Camera_getNumberOfCameras },
869  { "_getCameraInfo",
870    "(ILandroid/hardware/Camera$CameraInfo;)V",
871    (void*)android_hardware_Camera_getCameraInfo },
872  { "native_setup",
873    "(Ljava/lang/Object;ILjava/lang/String;)V",
874    (void*)android_hardware_Camera_native_setup },
875  { "native_release",
876    "()V",
877    (void*)android_hardware_Camera_release },
878  { "setPreviewDisplay",
879    "(Landroid/view/Surface;)V",
880    (void *)android_hardware_Camera_setPreviewDisplay },
881  { "setPreviewTexture",
882    "(Landroid/graphics/SurfaceTexture;)V",
883    (void *)android_hardware_Camera_setPreviewTexture },
884  { "startPreview",
885    "()V",
886    (void *)android_hardware_Camera_startPreview },
887  { "_stopPreview",
888    "()V",
889    (void *)android_hardware_Camera_stopPreview },
890  { "previewEnabled",
891    "()Z",
892    (void *)android_hardware_Camera_previewEnabled },
893  { "setHasPreviewCallback",
894    "(ZZ)V",
895    (void *)android_hardware_Camera_setHasPreviewCallback },
896  { "_addCallbackBuffer",
897    "([BI)V",
898    (void *)android_hardware_Camera_addCallbackBuffer },
899  { "native_autoFocus",
900    "()V",
901    (void *)android_hardware_Camera_autoFocus },
902  { "native_cancelAutoFocus",
903    "()V",
904    (void *)android_hardware_Camera_cancelAutoFocus },
905  { "native_takePicture",
906    "(I)V",
907    (void *)android_hardware_Camera_takePicture },
908  { "native_setParameters",
909    "(Ljava/lang/String;)V",
910    (void *)android_hardware_Camera_setParameters },
911  { "native_getParameters",
912    "()Ljava/lang/String;",
913    (void *)android_hardware_Camera_getParameters },
914  { "reconnect",
915    "()V",
916    (void*)android_hardware_Camera_reconnect },
917  { "lock",
918    "()V",
919    (void*)android_hardware_Camera_lock },
920  { "unlock",
921    "()V",
922    (void*)android_hardware_Camera_unlock },
923  { "startSmoothZoom",
924    "(I)V",
925    (void *)android_hardware_Camera_startSmoothZoom },
926  { "stopSmoothZoom",
927    "()V",
928    (void *)android_hardware_Camera_stopSmoothZoom },
929  { "setDisplayOrientation",
930    "(I)V",
931    (void *)android_hardware_Camera_setDisplayOrientation },
932  { "_enableShutterSound",
933    "(Z)Z",
934    (void *)android_hardware_Camera_enableShutterSound },
935  { "_startFaceDetection",
936    "(I)V",
937    (void *)android_hardware_Camera_startFaceDetection },
938  { "_stopFaceDetection",
939    "()V",
940    (void *)android_hardware_Camera_stopFaceDetection},
941  { "enableFocusMoveCallback",
942    "(I)V",
943    (void *)android_hardware_Camera_enableFocusMoveCallback},
944};
945
946struct field {
947    const char *class_name;
948    const char *field_name;
949    const char *field_type;
950    jfieldID   *jfield;
951};
952
953static int find_fields(JNIEnv *env, field *fields, int count)
954{
955    for (int i = 0; i < count; i++) {
956        field *f = &fields[i];
957        jclass clazz = env->FindClass(f->class_name);
958        if (clazz == NULL) {
959            ALOGE("Can't find %s", f->class_name);
960            return -1;
961        }
962
963        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
964        if (field == NULL) {
965            ALOGE("Can't find %s.%s", f->class_name, f->field_name);
966            return -1;
967        }
968
969        *(f->jfield) = field;
970    }
971
972    return 0;
973}
974
975// Get all the required offsets in java class and register native functions
976int register_android_hardware_Camera(JNIEnv *env)
977{
978    field fields_to_find[] = {
979        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
980        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
981        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
982        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
983          &fields.canDisableShutterSound },
984        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
985        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
986        { "android/graphics/Rect", "left", "I", &fields.rect_left },
987        { "android/graphics/Rect", "top", "I", &fields.rect_top },
988        { "android/graphics/Rect", "right", "I", &fields.rect_right },
989        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
990    };
991
992    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
993        return -1;
994
995    jclass clazz = env->FindClass("android/hardware/Camera");
996    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
997                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
998    if (fields.post_event == NULL) {
999        ALOGE("Can't find android/hardware/Camera.postEventFromNative");
1000        return -1;
1001    }
1002
1003    clazz = env->FindClass("android/graphics/Rect");
1004    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
1005    if (fields.rect_constructor == NULL) {
1006        ALOGE("Can't find android/graphics/Rect.Rect()");
1007        return -1;
1008    }
1009
1010    clazz = env->FindClass("android/hardware/Camera$Face");
1011    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
1012    if (fields.face_constructor == NULL) {
1013        ALOGE("Can't find android/hardware/Camera$Face.Face()");
1014        return -1;
1015    }
1016
1017    // Register native functions
1018    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
1019                                              camMethods, NELEM(camMethods));
1020}
1021