android_hardware_Camera.cpp revision 7005b67c127d229017840925d2bc1bd84c43aaf5 
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_setPreviewCallbackSurface(JNIEnv *env,
590        jobject thiz, jobject jSurface)
591{
592    ALOGV("setPreviewCallbackSurface");
593    JNICameraContext* context;
594    sp<Camera> camera = get_native_camera(env, thiz, &context);
595    if (camera == 0) return;
596
597    sp<IGraphicBufferProducer> gbp;
598    sp<Surface> surface;
599    if (jSurface) {
600        surface = android_view_Surface_getSurface(env, jSurface);
601        if (surface != NULL) {
602            gbp = surface->getIGraphicBufferProducer();
603        }
604    }
605    // Clear out normal preview callbacks
606    context->setCallbackMode(env, false, false);
607    // Then set up callback surface
608    if (camera->setPreviewCallbackTarget(gbp) != NO_ERROR) {
609        jniThrowException(env, "java/io/IOException", "setPreviewCallbackTarget failed");
610    }
611}
612
613static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
614{
615    ALOGV("startPreview");
616    sp<Camera> camera = get_native_camera(env, thiz, NULL);
617    if (camera == 0) return;
618
619    if (camera->startPreview() != NO_ERROR) {
620        jniThrowRuntimeException(env, "startPreview failed");
621        return;
622    }
623}
624
625static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
626{
627    ALOGV("stopPreview");
628    sp<Camera> c = get_native_camera(env, thiz, NULL);
629    if (c == 0) return;
630
631    c->stopPreview();
632}
633
634static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
635{
636    ALOGV("previewEnabled");
637    sp<Camera> c = get_native_camera(env, thiz, NULL);
638    if (c == 0) return false;
639
640    return c->previewEnabled();
641}
642
643static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
644{
645    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
646    // Important: Only install preview_callback if the Java code has called
647    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
648    // each preview frame for nothing.
649    JNICameraContext* context;
650    sp<Camera> camera = get_native_camera(env, thiz, &context);
651    if (camera == 0) return;
652
653    // setCallbackMode will take care of setting the context flags and calling
654    // camera->setPreviewCallbackFlags within a mutex for us.
655    context->setCallbackMode(env, installed, manualBuffer);
656}
657
658static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
659    ALOGV("addCallbackBuffer: 0x%x", msgType);
660
661    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
662
663    if (context != NULL) {
664        context->addCallbackBuffer(env, bytes, msgType);
665    }
666}
667
668static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
669{
670    ALOGV("autoFocus");
671    JNICameraContext* context;
672    sp<Camera> c = get_native_camera(env, thiz, &context);
673    if (c == 0) return;
674
675    if (c->autoFocus() != NO_ERROR) {
676        jniThrowRuntimeException(env, "autoFocus failed");
677    }
678}
679
680static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
681{
682    ALOGV("cancelAutoFocus");
683    JNICameraContext* context;
684    sp<Camera> c = get_native_camera(env, thiz, &context);
685    if (c == 0) return;
686
687    if (c->cancelAutoFocus() != NO_ERROR) {
688        jniThrowRuntimeException(env, "cancelAutoFocus failed");
689    }
690}
691
692static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
693{
694    ALOGV("takePicture");
695    JNICameraContext* context;
696    sp<Camera> camera = get_native_camera(env, thiz, &context);
697    if (camera == 0) return;
698
699    /*
700     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
701     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
702     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
703     * is enabled to receive the callback notification but no data.
704     *
705     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
706     * Java application.
707     */
708    if (msgType & CAMERA_MSG_RAW_IMAGE) {
709        ALOGV("Enable raw image callback buffer");
710        if (!context->isRawImageCallbackBufferAvailable()) {
711            ALOGV("Enable raw image notification, since no callback buffer exists");
712            msgType &= ~CAMERA_MSG_RAW_IMAGE;
713            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
714        }
715    }
716
717    if (camera->takePicture(msgType) != NO_ERROR) {
718        jniThrowRuntimeException(env, "takePicture failed");
719        return;
720    }
721}
722
723static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
724{
725    ALOGV("setParameters");
726    sp<Camera> camera = get_native_camera(env, thiz, NULL);
727    if (camera == 0) return;
728
729    const jchar* str = env->GetStringCritical(params, 0);
730    String8 params8;
731    if (params) {
732        params8 = String8(str, env->GetStringLength(params));
733        env->ReleaseStringCritical(params, str);
734    }
735    if (camera->setParameters(params8) != NO_ERROR) {
736        jniThrowRuntimeException(env, "setParameters failed");
737        return;
738    }
739}
740
741static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
742{
743    ALOGV("getParameters");
744    sp<Camera> camera = get_native_camera(env, thiz, NULL);
745    if (camera == 0) return 0;
746
747    String8 params8 = camera->getParameters();
748    if (params8.isEmpty()) {
749        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
750        return 0;
751    }
752    return env->NewStringUTF(params8.string());
753}
754
755static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
756{
757    ALOGV("reconnect");
758    sp<Camera> camera = get_native_camera(env, thiz, NULL);
759    if (camera == 0) return;
760
761    if (camera->reconnect() != NO_ERROR) {
762        jniThrowException(env, "java/io/IOException", "reconnect failed");
763        return;
764    }
765}
766
767static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
768{
769    ALOGV("lock");
770    sp<Camera> camera = get_native_camera(env, thiz, NULL);
771    if (camera == 0) return;
772
773    if (camera->lock() != NO_ERROR) {
774        jniThrowRuntimeException(env, "lock failed");
775    }
776}
777
778static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
779{
780    ALOGV("unlock");
781    sp<Camera> camera = get_native_camera(env, thiz, NULL);
782    if (camera == 0) return;
783
784    if (camera->unlock() != NO_ERROR) {
785        jniThrowRuntimeException(env, "unlock failed");
786    }
787}
788
789static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
790{
791    ALOGV("startSmoothZoom");
792    sp<Camera> camera = get_native_camera(env, thiz, NULL);
793    if (camera == 0) return;
794
795    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
796    if (rc == BAD_VALUE) {
797        char msg[64];
798        sprintf(msg, "invalid zoom value=%d", value);
799        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
800    } else if (rc != NO_ERROR) {
801        jniThrowRuntimeException(env, "start smooth zoom failed");
802    }
803}
804
805static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
806{
807    ALOGV("stopSmoothZoom");
808    sp<Camera> camera = get_native_camera(env, thiz, NULL);
809    if (camera == 0) return;
810
811    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
812        jniThrowRuntimeException(env, "stop smooth zoom failed");
813    }
814}
815
816static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
817        jint value)
818{
819    ALOGV("setDisplayOrientation");
820    sp<Camera> camera = get_native_camera(env, thiz, NULL);
821    if (camera == 0) return;
822
823    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
824        jniThrowRuntimeException(env, "set display orientation failed");
825    }
826}
827
828static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
829        jboolean enabled)
830{
831    ALOGV("enableShutterSound");
832    sp<Camera> camera = get_native_camera(env, thiz, NULL);
833    if (camera == 0) return JNI_FALSE;
834
835    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
836    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
837    if (rc == NO_ERROR) {
838        return JNI_TRUE;
839    } else if (rc == PERMISSION_DENIED) {
840        return JNI_FALSE;
841    } else {
842        jniThrowRuntimeException(env, "enable shutter sound failed");
843        return JNI_FALSE;
844    }
845}
846
847static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
848        jint type)
849{
850    ALOGV("startFaceDetection");
851    JNICameraContext* context;
852    sp<Camera> camera = get_native_camera(env, thiz, &context);
853    if (camera == 0) return;
854
855    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
856    if (rc == BAD_VALUE) {
857        char msg[64];
858        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
859        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
860    } else if (rc != NO_ERROR) {
861        jniThrowRuntimeException(env, "start face detection failed");
862    }
863}
864
865static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
866{
867    ALOGV("stopFaceDetection");
868    sp<Camera> camera = get_native_camera(env, thiz, NULL);
869    if (camera == 0) return;
870
871    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
872        jniThrowRuntimeException(env, "stop face detection failed");
873    }
874}
875
876static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
877{
878    ALOGV("enableFocusMoveCallback");
879    sp<Camera> camera = get_native_camera(env, thiz, NULL);
880    if (camera == 0) return;
881
882    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
883        jniThrowRuntimeException(env, "enable focus move callback failed");
884    }
885}
886
887//-------------------------------------------------
888
889static JNINativeMethod camMethods[] = {
890  { "getNumberOfCameras",
891    "()I",
892    (void *)android_hardware_Camera_getNumberOfCameras },
893  { "_getCameraInfo",
894    "(ILandroid/hardware/Camera$CameraInfo;)V",
895    (void*)android_hardware_Camera_getCameraInfo },
896  { "native_setup",
897    "(Ljava/lang/Object;ILjava/lang/String;)V",
898    (void*)android_hardware_Camera_native_setup },
899  { "native_release",
900    "()V",
901    (void*)android_hardware_Camera_release },
902  { "setPreviewDisplay",
903    "(Landroid/view/Surface;)V",
904    (void *)android_hardware_Camera_setPreviewDisplay },
905  { "setPreviewTexture",
906    "(Landroid/graphics/SurfaceTexture;)V",
907    (void *)android_hardware_Camera_setPreviewTexture },
908  { "setPreviewCallbackSurface",
909    "(Landroid/view/Surface;)V",
910    (void *)android_hardware_Camera_setPreviewCallbackSurface },
911  { "startPreview",
912    "()V",
913    (void *)android_hardware_Camera_startPreview },
914  { "_stopPreview",
915    "()V",
916    (void *)android_hardware_Camera_stopPreview },
917  { "previewEnabled",
918    "()Z",
919    (void *)android_hardware_Camera_previewEnabled },
920  { "setHasPreviewCallback",
921    "(ZZ)V",
922    (void *)android_hardware_Camera_setHasPreviewCallback },
923  { "_addCallbackBuffer",
924    "([BI)V",
925    (void *)android_hardware_Camera_addCallbackBuffer },
926  { "native_autoFocus",
927    "()V",
928    (void *)android_hardware_Camera_autoFocus },
929  { "native_cancelAutoFocus",
930    "()V",
931    (void *)android_hardware_Camera_cancelAutoFocus },
932  { "native_takePicture",
933    "(I)V",
934    (void *)android_hardware_Camera_takePicture },
935  { "native_setParameters",
936    "(Ljava/lang/String;)V",
937    (void *)android_hardware_Camera_setParameters },
938  { "native_getParameters",
939    "()Ljava/lang/String;",
940    (void *)android_hardware_Camera_getParameters },
941  { "reconnect",
942    "()V",
943    (void*)android_hardware_Camera_reconnect },
944  { "lock",
945    "()V",
946    (void*)android_hardware_Camera_lock },
947  { "unlock",
948    "()V",
949    (void*)android_hardware_Camera_unlock },
950  { "startSmoothZoom",
951    "(I)V",
952    (void *)android_hardware_Camera_startSmoothZoom },
953  { "stopSmoothZoom",
954    "()V",
955    (void *)android_hardware_Camera_stopSmoothZoom },
956  { "setDisplayOrientation",
957    "(I)V",
958    (void *)android_hardware_Camera_setDisplayOrientation },
959  { "_enableShutterSound",
960    "(Z)Z",
961    (void *)android_hardware_Camera_enableShutterSound },
962  { "_startFaceDetection",
963    "(I)V",
964    (void *)android_hardware_Camera_startFaceDetection },
965  { "_stopFaceDetection",
966    "()V",
967    (void *)android_hardware_Camera_stopFaceDetection},
968  { "enableFocusMoveCallback",
969    "(I)V",
970    (void *)android_hardware_Camera_enableFocusMoveCallback},
971};
972
973struct field {
974    const char *class_name;
975    const char *field_name;
976    const char *field_type;
977    jfieldID   *jfield;
978};
979
980static int find_fields(JNIEnv *env, field *fields, int count)
981{
982    for (int i = 0; i < count; i++) {
983        field *f = &fields[i];
984        jclass clazz = env->FindClass(f->class_name);
985        if (clazz == NULL) {
986            ALOGE("Can't find %s", f->class_name);
987            return -1;
988        }
989
990        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
991        if (field == NULL) {
992            ALOGE("Can't find %s.%s", f->class_name, f->field_name);
993            return -1;
994        }
995
996        *(f->jfield) = field;
997    }
998
999    return 0;
1000}
1001
1002// Get all the required offsets in java class and register native functions
1003int register_android_hardware_Camera(JNIEnv *env)
1004{
1005    field fields_to_find[] = {
1006        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
1007        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
1008        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
1009        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
1010          &fields.canDisableShutterSound },
1011        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
1012        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
1013        { "android/graphics/Rect", "left", "I", &fields.rect_left },
1014        { "android/graphics/Rect", "top", "I", &fields.rect_top },
1015        { "android/graphics/Rect", "right", "I", &fields.rect_right },
1016        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
1017    };
1018
1019    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
1020        return -1;
1021
1022    jclass clazz = env->FindClass("android/hardware/Camera");
1023    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
1024                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
1025    if (fields.post_event == NULL) {
1026        ALOGE("Can't find android/hardware/Camera.postEventFromNative");
1027        return -1;
1028    }
1029
1030    clazz = env->FindClass("android/graphics/Rect");
1031    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
1032    if (fields.rect_constructor == NULL) {
1033        ALOGE("Can't find android/graphics/Rect.Rect()");
1034        return -1;
1035    }
1036
1037    clazz = env->FindClass("android/hardware/Camera$Face");
1038    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
1039    if (fields.face_constructor == NULL) {
1040        ALOGE("Can't find android/hardware/Camera$Face.Face()");
1041        return -1;
1042    }
1043
1044    // Register native functions
1045    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
1046                                              camMethods, NELEM(camMethods));
1047}
1048