android_hardware_Camera.cpp revision feb50af361e4305a25758966b6b5df2738c00259 
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#include <utils/Errors.h>
31
32#include <gui/GLConsumer.h>
33#include <gui/Surface.h>
34#include <camera/Camera.h>
35#include <binder/IMemory.h>
36
37using namespace android;
38
39struct fields_t {
40    jfieldID    context;
41    jfieldID    facing;
42    jfieldID    orientation;
43    jfieldID    canDisableShutterSound;
44    jfieldID    face_rect;
45    jfieldID    face_score;
46    jfieldID    rect_left;
47    jfieldID    rect_top;
48    jfieldID    rect_right;
49    jfieldID    rect_bottom;
50    jmethodID   post_event;
51    jmethodID   rect_constructor;
52    jmethodID   face_constructor;
53};
54
55static fields_t fields;
56static Mutex sLock;
57
58// provides persistent context for calls from native code to Java
59class JNICameraContext: public CameraListener
60{
61public:
62    JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera);
63    ~JNICameraContext() { release(); }
64    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2);
65    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr,
66                          camera_frame_metadata_t *metadata);
67    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
68    void postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata);
69    void addCallbackBuffer(JNIEnv *env, jbyteArray cbb, int msgType);
70    void setCallbackMode(JNIEnv *env, bool installed, bool manualMode);
71    sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; }
72    bool isRawImageCallbackBufferAvailable() const;
73    void release();
74
75private:
76    void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType);
77    void clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers);
78    void clearCallbackBuffers_l(JNIEnv *env);
79    jbyteArray getCallbackBuffer(JNIEnv *env, Vector<jbyteArray> *buffers, size_t bufferSize);
80
81    jobject     mCameraJObjectWeak;     // weak reference to java object
82    jclass      mCameraJClass;          // strong reference to java class
83    sp<Camera>  mCamera;                // strong reference to native object
84    jclass      mFaceClass;  // strong reference to Face class
85    jclass      mRectClass;  // strong reference to Rect class
86    Mutex       mLock;
87
88    /*
89     * Global reference application-managed raw image buffer queue.
90     *
91     * Manual-only mode is supported for raw image callbacks, which is
92     * set whenever method addCallbackBuffer() with msgType =
93     * CAMERA_MSG_RAW_IMAGE is called; otherwise, null is returned
94     * with raw image callbacks.
95     */
96    Vector<jbyteArray> mRawImageCallbackBuffers;
97
98    /*
99     * Application-managed preview buffer queue and the flags
100     * associated with the usage of the preview buffer callback.
101     */
102    Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[]
103    bool mManualBufferMode;              // Whether to use application managed buffers.
104    bool mManualCameraCallbackSet;       // Whether the callback has been set, used to
105                                         // reduce unnecessary calls to set the callback.
106};
107
108bool JNICameraContext::isRawImageCallbackBufferAvailable() const
109{
110    return !mRawImageCallbackBuffers.isEmpty();
111}
112
113sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
114{
115    sp<Camera> camera;
116    Mutex::Autolock _l(sLock);
117    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
118    if (context != NULL) {
119        camera = context->getCamera();
120    }
121    ALOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
122    if (camera == 0) {
123        jniThrowRuntimeException(env, "Method called after release()");
124    }
125
126    if (pContext != NULL) *pContext = context;
127    return camera;
128}
129
130JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera)
131{
132    mCameraJObjectWeak = env->NewGlobalRef(weak_this);
133    mCameraJClass = (jclass)env->NewGlobalRef(clazz);
134    mCamera = camera;
135
136    jclass faceClazz = env->FindClass("android/hardware/Camera$Face");
137    mFaceClass = (jclass) env->NewGlobalRef(faceClazz);
138
139    jclass rectClazz = env->FindClass("android/graphics/Rect");
140    mRectClass = (jclass) env->NewGlobalRef(rectClazz);
141
142    mManualBufferMode = false;
143    mManualCameraCallbackSet = false;
144}
145
146void JNICameraContext::release()
147{
148    ALOGV("release");
149    Mutex::Autolock _l(mLock);
150    JNIEnv *env = AndroidRuntime::getJNIEnv();
151
152    if (mCameraJObjectWeak != NULL) {
153        env->DeleteGlobalRef(mCameraJObjectWeak);
154        mCameraJObjectWeak = NULL;
155    }
156    if (mCameraJClass != NULL) {
157        env->DeleteGlobalRef(mCameraJClass);
158        mCameraJClass = NULL;
159    }
160    if (mFaceClass != NULL) {
161        env->DeleteGlobalRef(mFaceClass);
162        mFaceClass = NULL;
163    }
164    if (mRectClass != NULL) {
165        env->DeleteGlobalRef(mRectClass);
166        mRectClass = NULL;
167    }
168    clearCallbackBuffers_l(env);
169    mCamera.clear();
170}
171
172void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2)
173{
174    ALOGV("notify");
175
176    // VM pointer will be NULL if object is released
177    Mutex::Autolock _l(mLock);
178    if (mCameraJObjectWeak == NULL) {
179        ALOGW("callback on dead camera object");
180        return;
181    }
182    JNIEnv *env = AndroidRuntime::getJNIEnv();
183
184    /*
185     * If the notification or msgType is CAMERA_MSG_RAW_IMAGE_NOTIFY, change it
186     * to CAMERA_MSG_RAW_IMAGE since CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed
187     * to the Java app.
188     */
189    if (msgType == CAMERA_MSG_RAW_IMAGE_NOTIFY) {
190        msgType = CAMERA_MSG_RAW_IMAGE;
191    }
192
193    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
194            mCameraJObjectWeak, msgType, ext1, ext2, NULL);
195}
196
197jbyteArray JNICameraContext::getCallbackBuffer(
198        JNIEnv* env, Vector<jbyteArray>* buffers, size_t bufferSize)
199{
200    jbyteArray obj = NULL;
201
202    // Vector access should be protected by lock in postData()
203    if (!buffers->isEmpty()) {
204        ALOGV("Using callback buffer from queue of length %d", buffers->size());
205        jbyteArray globalBuffer = buffers->itemAt(0);
206        buffers->removeAt(0);
207
208        obj = (jbyteArray)env->NewLocalRef(globalBuffer);
209        env->DeleteGlobalRef(globalBuffer);
210
211        if (obj != NULL) {
212            jsize bufferLength = env->GetArrayLength(obj);
213            if ((int)bufferLength < (int)bufferSize) {
214                ALOGE("Callback buffer was too small! Expected %d bytes, but got %d bytes!",
215                    bufferSize, bufferLength);
216                env->DeleteLocalRef(obj);
217                return NULL;
218            }
219        }
220    }
221
222    return obj;
223}
224
225void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType)
226{
227    jbyteArray obj = NULL;
228
229    // allocate Java byte array and copy data
230    if (dataPtr != NULL) {
231        ssize_t offset;
232        size_t size;
233        sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size);
234        ALOGV("copyAndPost: off=%zd, size=%zu", offset, size);
235        uint8_t *heapBase = (uint8_t*)heap->base();
236
237        if (heapBase != NULL) {
238            const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset);
239
240            if (msgType == CAMERA_MSG_RAW_IMAGE) {
241                obj = getCallbackBuffer(env, &mRawImageCallbackBuffers, size);
242            } else if (msgType == CAMERA_MSG_PREVIEW_FRAME && mManualBufferMode) {
243                obj = getCallbackBuffer(env, &mCallbackBuffers, size);
244
245                if (mCallbackBuffers.isEmpty()) {
246                    ALOGV("Out of buffers, clearing callback!");
247                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
248                    mManualCameraCallbackSet = false;
249
250                    if (obj == NULL) {
251                        return;
252                    }
253                }
254            } else {
255                ALOGV("Allocating callback buffer");
256                obj = env->NewByteArray(size);
257            }
258
259            if (obj == NULL) {
260                ALOGE("Couldn't allocate byte array for JPEG data");
261                env->ExceptionClear();
262            } else {
263                env->SetByteArrayRegion(obj, 0, size, data);
264            }
265        } else {
266            ALOGE("image heap is NULL");
267        }
268    }
269
270    // post image data to Java
271    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
272            mCameraJObjectWeak, msgType, 0, 0, obj);
273    if (obj) {
274        env->DeleteLocalRef(obj);
275    }
276}
277
278void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr,
279                                camera_frame_metadata_t *metadata)
280{
281    // VM pointer will be NULL if object is released
282    Mutex::Autolock _l(mLock);
283    JNIEnv *env = AndroidRuntime::getJNIEnv();
284    if (mCameraJObjectWeak == NULL) {
285        ALOGW("callback on dead camera object");
286        return;
287    }
288
289    int32_t dataMsgType = msgType & ~CAMERA_MSG_PREVIEW_METADATA;
290
291    // return data based on callback type
292    switch (dataMsgType) {
293        case CAMERA_MSG_VIDEO_FRAME:
294            // should never happen
295            break;
296
297        // For backward-compatibility purpose, if there is no callback
298        // buffer for raw image, the callback returns null.
299        case CAMERA_MSG_RAW_IMAGE:
300            ALOGV("rawCallback");
301            if (mRawImageCallbackBuffers.isEmpty()) {
302                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
303                        mCameraJObjectWeak, dataMsgType, 0, 0, NULL);
304            } else {
305                copyAndPost(env, dataPtr, dataMsgType);
306            }
307            break;
308
309        // There is no data.
310        case 0:
311            break;
312
313        default:
314            ALOGV("dataCallback(%d, %p)", dataMsgType, dataPtr.get());
315            copyAndPost(env, dataPtr, dataMsgType);
316            break;
317    }
318
319    // post frame metadata to Java
320    if (metadata && (msgType & CAMERA_MSG_PREVIEW_METADATA)) {
321        postMetadata(env, CAMERA_MSG_PREVIEW_METADATA, metadata);
322    }
323}
324
325void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
326{
327    // TODO: plumb up to Java. For now, just drop the timestamp
328    postData(msgType, dataPtr, NULL);
329}
330
331void JNICameraContext::postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata)
332{
333    jobjectArray obj = NULL;
334    obj = (jobjectArray) env->NewObjectArray(metadata->number_of_faces,
335                                             mFaceClass, NULL);
336    if (obj == NULL) {
337        ALOGE("Couldn't allocate face metadata array");
338        return;
339    }
340
341    for (int i = 0; i < metadata->number_of_faces; i++) {
342        jobject face = env->NewObject(mFaceClass, fields.face_constructor);
343        env->SetObjectArrayElement(obj, i, face);
344
345        jobject rect = env->NewObject(mRectClass, fields.rect_constructor);
346        env->SetIntField(rect, fields.rect_left, metadata->faces[i].rect[0]);
347        env->SetIntField(rect, fields.rect_top, metadata->faces[i].rect[1]);
348        env->SetIntField(rect, fields.rect_right, metadata->faces[i].rect[2]);
349        env->SetIntField(rect, fields.rect_bottom, metadata->faces[i].rect[3]);
350
351        env->SetObjectField(face, fields.face_rect, rect);
352        env->SetIntField(face, fields.face_score, metadata->faces[i].score);
353
354        env->DeleteLocalRef(face);
355        env->DeleteLocalRef(rect);
356    }
357    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
358            mCameraJObjectWeak, msgType, 0, 0, obj);
359    env->DeleteLocalRef(obj);
360}
361
362void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
363{
364    Mutex::Autolock _l(mLock);
365    mManualBufferMode = manualMode;
366    mManualCameraCallbackSet = false;
367
368    // In order to limit the over usage of binder threads, all non-manual buffer
369    // callbacks use CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
370    //
371    // Continuous callbacks will have the callback re-registered from handleMessage.
372    // Manual buffer mode will operate as fast as possible, relying on the finite supply
373    // of buffers for throttling.
374
375    if (!installed) {
376        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
377        clearCallbackBuffers_l(env, &mCallbackBuffers);
378    } else if (mManualBufferMode) {
379        if (!mCallbackBuffers.isEmpty()) {
380            mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
381            mManualCameraCallbackSet = true;
382        }
383    } else {
384        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
385        clearCallbackBuffers_l(env, &mCallbackBuffers);
386    }
387}
388
389void JNICameraContext::addCallbackBuffer(
390        JNIEnv *env, jbyteArray cbb, int msgType)
391{
392    ALOGV("addCallbackBuffer: 0x%x", msgType);
393    if (cbb != NULL) {
394        Mutex::Autolock _l(mLock);
395        switch (msgType) {
396            case CAMERA_MSG_PREVIEW_FRAME: {
397                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
398                mCallbackBuffers.push(callbackBuffer);
399
400                ALOGV("Adding callback buffer to queue, %d total",
401                        mCallbackBuffers.size());
402
403                // We want to make sure the camera knows we're ready for the
404                // next frame. This may have come unset had we not had a
405                // callbackbuffer ready for it last time.
406                if (mManualBufferMode && !mManualCameraCallbackSet) {
407                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
408                    mManualCameraCallbackSet = true;
409                }
410                break;
411            }
412            case CAMERA_MSG_RAW_IMAGE: {
413                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
414                mRawImageCallbackBuffers.push(callbackBuffer);
415                break;
416            }
417            default: {
418                jniThrowException(env,
419                        "java/lang/IllegalArgumentException",
420                        "Unsupported message type");
421                return;
422            }
423        }
424    } else {
425       ALOGE("Null byte array!");
426    }
427}
428
429void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
430{
431    clearCallbackBuffers_l(env, &mCallbackBuffers);
432    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
433}
434
435void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
436    ALOGV("Clearing callback buffers, %d remained", buffers->size());
437    while (!buffers->isEmpty()) {
438        env->DeleteGlobalRef(buffers->top());
439        buffers->pop();
440    }
441}
442
443static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
444{
445    return Camera::getNumberOfCameras();
446}
447
448static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
449    jint cameraId, jobject info_obj)
450{
451    CameraInfo cameraInfo;
452    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
453    if (rc != NO_ERROR) {
454        jniThrowRuntimeException(env, "Fail to get camera info");
455        return;
456    }
457    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
458    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
459
460    char value[PROPERTY_VALUE_MAX];
461    property_get("ro.camera.sound.forced", value, "0");
462    jboolean canDisableShutterSound = (strncmp(value, "0", 2) == 0);
463    env->SetBooleanField(info_obj, fields.canDisableShutterSound,
464            canDisableShutterSound);
465}
466
467// connect to camera service
468static jint android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
469    jobject weak_this, jint cameraId, jstring clientPackageName)
470{
471    // Convert jstring to String16
472    const char16_t *rawClientName = env->GetStringChars(clientPackageName, NULL);
473    jsize rawClientNameLen = env->GetStringLength(clientPackageName);
474    String16 clientName(rawClientName, rawClientNameLen);
475    env->ReleaseStringChars(clientPackageName, rawClientName);
476
477    sp<Camera> camera = Camera::connect(cameraId, clientName,
478            Camera::USE_CALLING_UID);
479
480    if (camera == NULL) {
481        return -EACCES;
482    }
483
484    // make sure camera hardware is alive
485    if (camera->getStatus() != NO_ERROR) {
486        return NO_INIT;
487    }
488
489    jclass clazz = env->GetObjectClass(thiz);
490    if (clazz == NULL) {
491        // This should never happen
492        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
493        return INVALID_OPERATION;
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->SetLongField(thiz, fields.context, (jlong)context.get());
504    return NO_ERROR;
505}
506
507// disconnect from camera service
508// It's okay to call this when the native camera context is already null.
509// This handles the case where the user has called release() and the
510// finalizer is invoked later.
511static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
512{
513    // TODO: Change to ALOGV
514    ALOGV("release camera");
515    JNICameraContext* context = NULL;
516    sp<Camera> camera;
517    {
518        Mutex::Autolock _l(sLock);
519        context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
520
521        // Make sure we do not attempt to callback on a deleted Java object.
522        env->SetLongField(thiz, fields.context, 0);
523    }
524
525    // clean up if release has not been called before
526    if (context != NULL) {
527        camera = context->getCamera();
528        context->release();
529        ALOGV("native_release: context=%p camera=%p", context, camera.get());
530
531        // clear callbacks
532        if (camera != NULL) {
533            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
534            camera->disconnect();
535        }
536
537        // remove context to prevent further Java access
538        context->decStrong((void*)android_hardware_Camera_native_setup);
539    }
540}
541
542static void android_hardware_Camera_setPreviewSurface(JNIEnv *env, jobject thiz, jobject jSurface)
543{
544    ALOGV("setPreviewSurface");
545    sp<Camera> camera = get_native_camera(env, thiz, NULL);
546    if (camera == 0) return;
547
548    sp<IGraphicBufferProducer> gbp;
549    sp<Surface> surface;
550    if (jSurface) {
551        surface = android_view_Surface_getSurface(env, jSurface);
552        if (surface != NULL) {
553            gbp = surface->getIGraphicBufferProducer();
554        }
555    }
556
557    if (camera->setPreviewTarget(gbp) != NO_ERROR) {
558        jniThrowException(env, "java/io/IOException", "setPreviewTexture failed");
559    }
560}
561
562static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
563        jobject thiz, jobject jSurfaceTexture)
564{
565    ALOGV("setPreviewTexture");
566    sp<Camera> camera = get_native_camera(env, thiz, NULL);
567    if (camera == 0) return;
568
569    sp<IGraphicBufferProducer> producer = NULL;
570    if (jSurfaceTexture != NULL) {
571        producer = SurfaceTexture_getProducer(env, jSurfaceTexture);
572        if (producer == NULL) {
573            jniThrowException(env, "java/lang/IllegalArgumentException",
574                    "SurfaceTexture already released in setPreviewTexture");
575            return;
576        }
577
578    }
579
580    if (camera->setPreviewTarget(producer) != NO_ERROR) {
581        jniThrowException(env, "java/io/IOException",
582                "setPreviewTexture failed");
583    }
584}
585
586static void android_hardware_Camera_setPreviewCallbackSurface(JNIEnv *env,
587        jobject thiz, jobject jSurface)
588{
589    ALOGV("setPreviewCallbackSurface");
590    JNICameraContext* context;
591    sp<Camera> camera = get_native_camera(env, thiz, &context);
592    if (camera == 0) return;
593
594    sp<IGraphicBufferProducer> gbp;
595    sp<Surface> surface;
596    if (jSurface) {
597        surface = android_view_Surface_getSurface(env, jSurface);
598        if (surface != NULL) {
599            gbp = surface->getIGraphicBufferProducer();
600        }
601    }
602    // Clear out normal preview callbacks
603    context->setCallbackMode(env, false, false);
604    // Then set up callback surface
605    if (camera->setPreviewCallbackTarget(gbp) != NO_ERROR) {
606        jniThrowException(env, "java/io/IOException", "setPreviewCallbackTarget failed");
607    }
608}
609
610static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
611{
612    ALOGV("startPreview");
613    sp<Camera> camera = get_native_camera(env, thiz, NULL);
614    if (camera == 0) return;
615
616    if (camera->startPreview() != NO_ERROR) {
617        jniThrowRuntimeException(env, "startPreview failed");
618        return;
619    }
620}
621
622static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
623{
624    ALOGV("stopPreview");
625    sp<Camera> c = get_native_camera(env, thiz, NULL);
626    if (c == 0) return;
627
628    c->stopPreview();
629}
630
631static jboolean android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
632{
633    ALOGV("previewEnabled");
634    sp<Camera> c = get_native_camera(env, thiz, NULL);
635    if (c == 0) return JNI_FALSE;
636
637    return c->previewEnabled() ? JNI_TRUE : JNI_FALSE;
638}
639
640static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
641{
642    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
643    // Important: Only install preview_callback if the Java code has called
644    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
645    // each preview frame for nothing.
646    JNICameraContext* context;
647    sp<Camera> camera = get_native_camera(env, thiz, &context);
648    if (camera == 0) return;
649
650    // setCallbackMode will take care of setting the context flags and calling
651    // camera->setPreviewCallbackFlags within a mutex for us.
652    context->setCallbackMode(env, installed, manualBuffer);
653}
654
655static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, jint msgType) {
656    ALOGV("addCallbackBuffer: 0x%x", msgType);
657
658    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
659
660    if (context != NULL) {
661        context->addCallbackBuffer(env, bytes, msgType);
662    }
663}
664
665static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
666{
667    ALOGV("autoFocus");
668    JNICameraContext* context;
669    sp<Camera> c = get_native_camera(env, thiz, &context);
670    if (c == 0) return;
671
672    if (c->autoFocus() != NO_ERROR) {
673        jniThrowRuntimeException(env, "autoFocus failed");
674    }
675}
676
677static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
678{
679    ALOGV("cancelAutoFocus");
680    JNICameraContext* context;
681    sp<Camera> c = get_native_camera(env, thiz, &context);
682    if (c == 0) return;
683
684    if (c->cancelAutoFocus() != NO_ERROR) {
685        jniThrowRuntimeException(env, "cancelAutoFocus failed");
686    }
687}
688
689static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, jint msgType)
690{
691    ALOGV("takePicture");
692    JNICameraContext* context;
693    sp<Camera> camera = get_native_camera(env, thiz, &context);
694    if (camera == 0) return;
695
696    /*
697     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
698     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
699     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
700     * is enabled to receive the callback notification but no data.
701     *
702     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
703     * Java application.
704     */
705    if (msgType & CAMERA_MSG_RAW_IMAGE) {
706        ALOGV("Enable raw image callback buffer");
707        if (!context->isRawImageCallbackBufferAvailable()) {
708            ALOGV("Enable raw image notification, since no callback buffer exists");
709            msgType &= ~CAMERA_MSG_RAW_IMAGE;
710            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
711        }
712    }
713
714    if (camera->takePicture(msgType) != NO_ERROR) {
715        jniThrowRuntimeException(env, "takePicture failed");
716        return;
717    }
718}
719
720static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
721{
722    ALOGV("setParameters");
723    sp<Camera> camera = get_native_camera(env, thiz, NULL);
724    if (camera == 0) return;
725
726    const jchar* str = env->GetStringCritical(params, 0);
727    String8 params8;
728    if (params) {
729        params8 = String8(str, env->GetStringLength(params));
730        env->ReleaseStringCritical(params, str);
731    }
732    if (camera->setParameters(params8) != NO_ERROR) {
733        jniThrowRuntimeException(env, "setParameters failed");
734        return;
735    }
736}
737
738static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
739{
740    ALOGV("getParameters");
741    sp<Camera> camera = get_native_camera(env, thiz, NULL);
742    if (camera == 0) return 0;
743
744    String8 params8 = camera->getParameters();
745    if (params8.isEmpty()) {
746        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
747        return 0;
748    }
749    return env->NewStringUTF(params8.string());
750}
751
752static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
753{
754    ALOGV("reconnect");
755    sp<Camera> camera = get_native_camera(env, thiz, NULL);
756    if (camera == 0) return;
757
758    if (camera->reconnect() != NO_ERROR) {
759        jniThrowException(env, "java/io/IOException", "reconnect failed");
760        return;
761    }
762}
763
764static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
765{
766    ALOGV("lock");
767    sp<Camera> camera = get_native_camera(env, thiz, NULL);
768    if (camera == 0) return;
769
770    if (camera->lock() != NO_ERROR) {
771        jniThrowRuntimeException(env, "lock failed");
772    }
773}
774
775static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
776{
777    ALOGV("unlock");
778    sp<Camera> camera = get_native_camera(env, thiz, NULL);
779    if (camera == 0) return;
780
781    if (camera->unlock() != NO_ERROR) {
782        jniThrowRuntimeException(env, "unlock failed");
783    }
784}
785
786static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
787{
788    ALOGV("startSmoothZoom");
789    sp<Camera> camera = get_native_camera(env, thiz, NULL);
790    if (camera == 0) return;
791
792    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
793    if (rc == BAD_VALUE) {
794        char msg[64];
795        sprintf(msg, "invalid zoom value=%d", value);
796        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
797    } else if (rc != NO_ERROR) {
798        jniThrowRuntimeException(env, "start smooth zoom failed");
799    }
800}
801
802static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
803{
804    ALOGV("stopSmoothZoom");
805    sp<Camera> camera = get_native_camera(env, thiz, NULL);
806    if (camera == 0) return;
807
808    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
809        jniThrowRuntimeException(env, "stop smooth zoom failed");
810    }
811}
812
813static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
814        jint value)
815{
816    ALOGV("setDisplayOrientation");
817    sp<Camera> camera = get_native_camera(env, thiz, NULL);
818    if (camera == 0) return;
819
820    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
821        jniThrowRuntimeException(env, "set display orientation failed");
822    }
823}
824
825static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
826        jboolean enabled)
827{
828    ALOGV("enableShutterSound");
829    sp<Camera> camera = get_native_camera(env, thiz, NULL);
830    if (camera == 0) return JNI_FALSE;
831
832    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
833    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
834    if (rc == NO_ERROR) {
835        return JNI_TRUE;
836    } else if (rc == PERMISSION_DENIED) {
837        return JNI_FALSE;
838    } else {
839        jniThrowRuntimeException(env, "enable shutter sound failed");
840        return JNI_FALSE;
841    }
842}
843
844static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
845        jint type)
846{
847    ALOGV("startFaceDetection");
848    JNICameraContext* context;
849    sp<Camera> camera = get_native_camera(env, thiz, &context);
850    if (camera == 0) return;
851
852    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
853    if (rc == BAD_VALUE) {
854        char msg[64];
855        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
856        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
857    } else if (rc != NO_ERROR) {
858        jniThrowRuntimeException(env, "start face detection failed");
859    }
860}
861
862static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
863{
864    ALOGV("stopFaceDetection");
865    sp<Camera> camera = get_native_camera(env, thiz, NULL);
866    if (camera == 0) return;
867
868    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
869        jniThrowRuntimeException(env, "stop face detection failed");
870    }
871}
872
873static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
874{
875    ALOGV("enableFocusMoveCallback");
876    sp<Camera> camera = get_native_camera(env, thiz, NULL);
877    if (camera == 0) return;
878
879    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
880        jniThrowRuntimeException(env, "enable focus move callback failed");
881    }
882}
883
884//-------------------------------------------------
885
886static JNINativeMethod camMethods[] = {
887  { "getNumberOfCameras",
888    "()I",
889    (void *)android_hardware_Camera_getNumberOfCameras },
890  { "_getCameraInfo",
891    "(ILandroid/hardware/Camera$CameraInfo;)V",
892    (void*)android_hardware_Camera_getCameraInfo },
893  { "native_setup",
894    "(Ljava/lang/Object;ILjava/lang/String;)I",
895    (void*)android_hardware_Camera_native_setup },
896  { "native_release",
897    "()V",
898    (void*)android_hardware_Camera_release },
899  { "setPreviewSurface",
900    "(Landroid/view/Surface;)V",
901    (void *)android_hardware_Camera_setPreviewSurface },
902  { "setPreviewTexture",
903    "(Landroid/graphics/SurfaceTexture;)V",
904    (void *)android_hardware_Camera_setPreviewTexture },
905  { "setPreviewCallbackSurface",
906    "(Landroid/view/Surface;)V",
907    (void *)android_hardware_Camera_setPreviewCallbackSurface },
908  { "startPreview",
909    "()V",
910    (void *)android_hardware_Camera_startPreview },
911  { "_stopPreview",
912    "()V",
913    (void *)android_hardware_Camera_stopPreview },
914  { "previewEnabled",
915    "()Z",
916    (void *)android_hardware_Camera_previewEnabled },
917  { "setHasPreviewCallback",
918    "(ZZ)V",
919    (void *)android_hardware_Camera_setHasPreviewCallback },
920  { "_addCallbackBuffer",
921    "([BI)V",
922    (void *)android_hardware_Camera_addCallbackBuffer },
923  { "native_autoFocus",
924    "()V",
925    (void *)android_hardware_Camera_autoFocus },
926  { "native_cancelAutoFocus",
927    "()V",
928    (void *)android_hardware_Camera_cancelAutoFocus },
929  { "native_takePicture",
930    "(I)V",
931    (void *)android_hardware_Camera_takePicture },
932  { "native_setParameters",
933    "(Ljava/lang/String;)V",
934    (void *)android_hardware_Camera_setParameters },
935  { "native_getParameters",
936    "()Ljava/lang/String;",
937    (void *)android_hardware_Camera_getParameters },
938  { "reconnect",
939    "()V",
940    (void*)android_hardware_Camera_reconnect },
941  { "lock",
942    "()V",
943    (void*)android_hardware_Camera_lock },
944  { "unlock",
945    "()V",
946    (void*)android_hardware_Camera_unlock },
947  { "startSmoothZoom",
948    "(I)V",
949    (void *)android_hardware_Camera_startSmoothZoom },
950  { "stopSmoothZoom",
951    "()V",
952    (void *)android_hardware_Camera_stopSmoothZoom },
953  { "setDisplayOrientation",
954    "(I)V",
955    (void *)android_hardware_Camera_setDisplayOrientation },
956  { "_enableShutterSound",
957    "(Z)Z",
958    (void *)android_hardware_Camera_enableShutterSound },
959  { "_startFaceDetection",
960    "(I)V",
961    (void *)android_hardware_Camera_startFaceDetection },
962  { "_stopFaceDetection",
963    "()V",
964    (void *)android_hardware_Camera_stopFaceDetection},
965  { "enableFocusMoveCallback",
966    "(I)V",
967    (void *)android_hardware_Camera_enableFocusMoveCallback},
968};
969
970struct field {
971    const char *class_name;
972    const char *field_name;
973    const char *field_type;
974    jfieldID   *jfield;
975};
976
977static int find_fields(JNIEnv *env, field *fields, int count)
978{
979    for (int i = 0; i < count; i++) {
980        field *f = &fields[i];
981        jclass clazz = env->FindClass(f->class_name);
982        if (clazz == NULL) {
983            ALOGE("Can't find %s", f->class_name);
984            return -1;
985        }
986
987        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
988        if (field == NULL) {
989            ALOGE("Can't find %s.%s", f->class_name, f->field_name);
990            return -1;
991        }
992
993        *(f->jfield) = field;
994    }
995
996    return 0;
997}
998
999// Get all the required offsets in java class and register native functions
1000int register_android_hardware_Camera(JNIEnv *env)
1001{
1002    field fields_to_find[] = {
1003        { "android/hardware/Camera", "mNativeContext",   "J", &fields.context },
1004        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
1005        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
1006        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
1007          &fields.canDisableShutterSound },
1008        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
1009        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
1010        { "android/graphics/Rect", "left", "I", &fields.rect_left },
1011        { "android/graphics/Rect", "top", "I", &fields.rect_top },
1012        { "android/graphics/Rect", "right", "I", &fields.rect_right },
1013        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
1014    };
1015
1016    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
1017        return -1;
1018
1019    jclass clazz = env->FindClass("android/hardware/Camera");
1020    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
1021                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
1022    if (fields.post_event == NULL) {
1023        ALOGE("Can't find android/hardware/Camera.postEventFromNative");
1024        return -1;
1025    }
1026
1027    clazz = env->FindClass("android/graphics/Rect");
1028    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
1029    if (fields.rect_constructor == NULL) {
1030        ALOGE("Can't find android/graphics/Rect.Rect()");
1031        return -1;
1032    }
1033
1034    clazz = env->FindClass("android/hardware/Camera$Face");
1035    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
1036    if (fields.face_constructor == NULL) {
1037        ALOGE("Can't find android/hardware/Camera$Face.Face()");
1038        return -1;
1039    }
1040
1041    // Register native functions
1042    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
1043                                              camMethods, NELEM(camMethods));
1044}
1045