android_hardware_Camera.cpp revision 020975236c53fe2eeb1ada57f27258802858d98f 
1/*
2**
3** Copyright 2008, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18//#define LOG_NDEBUG 0
19#define LOG_TAG "Camera-JNI"
20#include <utils/Log.h>
21
22#include "jni.h"
23#include "JNIHelp.h"
24#include "android_runtime/AndroidRuntime.h"
25
26#include <utils/Vector.h>
27
28#include <gui/SurfaceTexture.h>
29#include <surfaceflinger/Surface.h>
30#include <camera/Camera.h>
31#include <binder/IMemory.h>
32
33using namespace android;
34
35struct fields_t {
36    jfieldID    context;
37    jfieldID    surface;
38    jfieldID    surfaceTexture;
39    jfieldID    facing;
40    jfieldID    orientation;
41    jfieldID    face_rect;
42    jfieldID    face_score;
43    jfieldID    rect_left;
44    jfieldID    rect_top;
45    jfieldID    rect_right;
46    jfieldID    rect_bottom;
47    jmethodID   post_event;
48    jmethodID   rect_constructor;
49    jmethodID   face_constructor;
50};
51
52static fields_t fields;
53static Mutex sLock;
54
55// provides persistent context for calls from native code to Java
56class JNICameraContext: public CameraListener
57{
58public:
59    JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera);
60    ~JNICameraContext() { release(); }
61    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2);
62    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr,
63                          camera_frame_metadata_t *metadata);
64    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
65    void postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata);
66    void addCallbackBuffer(JNIEnv *env, jbyteArray cbb, int msgType);
67    void setCallbackMode(JNIEnv *env, bool installed, bool manualMode);
68    sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; }
69    bool isRawImageCallbackBufferAvailable() const;
70    void release();
71
72private:
73    void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType);
74    void clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers);
75    void clearCallbackBuffers_l(JNIEnv *env);
76    jbyteArray getCallbackBuffer(JNIEnv *env, Vector<jbyteArray> *buffers, size_t bufferSize);
77
78    jobject     mCameraJObjectWeak;     // weak reference to java object
79    jclass      mCameraJClass;          // strong reference to java class
80    sp<Camera>  mCamera;                // strong reference to native object
81    jclass      mFaceClass;  // strong reference to Face class
82    jclass      mRectClass;  // strong reference to Rect class
83    Mutex       mLock;
84
85    /*
86     * Global reference application-managed raw image buffer queue.
87     *
88     * Manual-only mode is supported for raw image callbacks, which is
89     * set whenever method addCallbackBuffer() with msgType =
90     * CAMERA_MSG_RAW_IMAGE is called; otherwise, null is returned
91     * with raw image callbacks.
92     */
93    Vector<jbyteArray> mRawImageCallbackBuffers;
94
95    /*
96     * Application-managed preview buffer queue and the flags
97     * associated with the usage of the preview buffer callback.
98     */
99    Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[]
100    bool mManualBufferMode;              // Whether to use application managed buffers.
101    bool mManualCameraCallbackSet;       // Whether the callback has been set, used to
102                                         // reduce unnecessary calls to set the callback.
103};
104
105bool JNICameraContext::isRawImageCallbackBufferAvailable() const
106{
107    return !mRawImageCallbackBuffers.isEmpty();
108}
109
110sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
111{
112    sp<Camera> camera;
113    Mutex::Autolock _l(sLock);
114    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
115    if (context != NULL) {
116        camera = context->getCamera();
117    }
118    ALOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
119    if (camera == 0) {
120        jniThrowRuntimeException(env, "Method called after release()");
121    }
122
123    if (pContext != NULL) *pContext = context;
124    return camera;
125}
126
127JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera)
128{
129    mCameraJObjectWeak = env->NewGlobalRef(weak_this);
130    mCameraJClass = (jclass)env->NewGlobalRef(clazz);
131    mCamera = camera;
132
133    jclass faceClazz = env->FindClass("android/hardware/Camera$Face");
134    mFaceClass = (jclass) env->NewGlobalRef(faceClazz);
135
136    jclass rectClazz = env->FindClass("android/graphics/Rect");
137    mRectClass = (jclass) env->NewGlobalRef(rectClazz);
138
139    mManualBufferMode = false;
140    mManualCameraCallbackSet = false;
141}
142
143void JNICameraContext::release()
144{
145    ALOGV("release");
146    Mutex::Autolock _l(mLock);
147    JNIEnv *env = AndroidRuntime::getJNIEnv();
148
149    if (mCameraJObjectWeak != NULL) {
150        env->DeleteGlobalRef(mCameraJObjectWeak);
151        mCameraJObjectWeak = NULL;
152    }
153    if (mCameraJClass != NULL) {
154        env->DeleteGlobalRef(mCameraJClass);
155        mCameraJClass = NULL;
156    }
157    if (mFaceClass != NULL) {
158        env->DeleteGlobalRef(mFaceClass);
159        mFaceClass = NULL;
160    }
161    if (mRectClass != NULL) {
162        env->DeleteGlobalRef(mRectClass);
163        mRectClass = NULL;
164    }
165    clearCallbackBuffers_l(env);
166    mCamera.clear();
167}
168
169void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2)
170{
171    ALOGV("notify");
172
173    // VM pointer will be NULL if object is released
174    Mutex::Autolock _l(mLock);
175    if (mCameraJObjectWeak == NULL) {
176        LOGW("callback on dead camera object");
177        return;
178    }
179    JNIEnv *env = AndroidRuntime::getJNIEnv();
180
181    /*
182     * If the notification or msgType is CAMERA_MSG_RAW_IMAGE_NOTIFY, change it
183     * to CAMERA_MSG_RAW_IMAGE since CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed
184     * to the Java app.
185     */
186    if (msgType == CAMERA_MSG_RAW_IMAGE_NOTIFY) {
187        msgType = CAMERA_MSG_RAW_IMAGE;
188    }
189
190    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
191            mCameraJObjectWeak, msgType, ext1, ext2, NULL);
192}
193
194jbyteArray JNICameraContext::getCallbackBuffer(
195        JNIEnv* env, Vector<jbyteArray>* buffers, size_t bufferSize)
196{
197    jbyteArray obj = NULL;
198
199    // Vector access should be protected by lock in postData()
200    if (!buffers->isEmpty()) {
201        ALOGV("Using callback buffer from queue of length %d", buffers->size());
202        jbyteArray globalBuffer = buffers->itemAt(0);
203        buffers->removeAt(0);
204
205        obj = (jbyteArray)env->NewLocalRef(globalBuffer);
206        env->DeleteGlobalRef(globalBuffer);
207
208        if (obj != NULL) {
209            jsize bufferLength = env->GetArrayLength(obj);
210            if ((int)bufferLength < (int)bufferSize) {
211                LOGE("Callback buffer was too small! Expected %d bytes, but got %d bytes!",
212                    bufferSize, bufferLength);
213                env->DeleteLocalRef(obj);
214                return NULL;
215            }
216        }
217    }
218
219    return obj;
220}
221
222void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType)
223{
224    jbyteArray obj = NULL;
225
226    // allocate Java byte array and copy data
227    if (dataPtr != NULL) {
228        ssize_t offset;
229        size_t size;
230        sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size);
231        ALOGV("copyAndPost: off=%ld, size=%d", offset, size);
232        uint8_t *heapBase = (uint8_t*)heap->base();
233
234        if (heapBase != NULL) {
235            const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset);
236
237            if (msgType == CAMERA_MSG_RAW_IMAGE) {
238                obj = getCallbackBuffer(env, &mRawImageCallbackBuffers, size);
239            } else if (msgType == CAMERA_MSG_PREVIEW_FRAME && mManualBufferMode) {
240                obj = getCallbackBuffer(env, &mCallbackBuffers, size);
241
242                if (mCallbackBuffers.isEmpty()) {
243                    ALOGV("Out of buffers, clearing callback!");
244                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
245                    mManualCameraCallbackSet = false;
246
247                    if (obj == NULL) {
248                        return;
249                    }
250                }
251            } else {
252                ALOGV("Allocating callback buffer");
253                obj = env->NewByteArray(size);
254            }
255
256            if (obj == NULL) {
257                LOGE("Couldn't allocate byte array for JPEG data");
258                env->ExceptionClear();
259            } else {
260                env->SetByteArrayRegion(obj, 0, size, data);
261            }
262        } else {
263            LOGE("image heap is NULL");
264        }
265    }
266
267    // post image data to Java
268    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
269            mCameraJObjectWeak, msgType, 0, 0, obj);
270    if (obj) {
271        env->DeleteLocalRef(obj);
272    }
273}
274
275void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr,
276                                camera_frame_metadata_t *metadata)
277{
278    // VM pointer will be NULL if object is released
279    Mutex::Autolock _l(mLock);
280    JNIEnv *env = AndroidRuntime::getJNIEnv();
281    if (mCameraJObjectWeak == NULL) {
282        LOGW("callback on dead camera object");
283        return;
284    }
285
286    int32_t dataMsgType = msgType & ~CAMERA_MSG_PREVIEW_METADATA;
287
288    // return data based on callback type
289    switch (dataMsgType) {
290        case CAMERA_MSG_VIDEO_FRAME:
291            // should never happen
292            break;
293
294        // For backward-compatibility purpose, if there is no callback
295        // buffer for raw image, the callback returns null.
296        case CAMERA_MSG_RAW_IMAGE:
297            ALOGV("rawCallback");
298            if (mRawImageCallbackBuffers.isEmpty()) {
299                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
300                        mCameraJObjectWeak, dataMsgType, 0, 0, NULL);
301            } else {
302                copyAndPost(env, dataPtr, dataMsgType);
303            }
304            break;
305
306        // There is no data.
307        case 0:
308            break;
309
310        default:
311            ALOGV("dataCallback(%d, %p)", dataMsgType, dataPtr.get());
312            copyAndPost(env, dataPtr, dataMsgType);
313            break;
314    }
315
316    // post frame metadata to Java
317    if (metadata && (msgType & CAMERA_MSG_PREVIEW_METADATA)) {
318        postMetadata(env, CAMERA_MSG_PREVIEW_METADATA, metadata);
319    }
320}
321
322void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
323{
324    // TODO: plumb up to Java. For now, just drop the timestamp
325    postData(msgType, dataPtr, NULL);
326}
327
328void JNICameraContext::postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata)
329{
330    jobjectArray obj = NULL;
331    obj = (jobjectArray) env->NewObjectArray(metadata->number_of_faces,
332                                             mFaceClass, NULL);
333    if (obj == NULL) {
334        LOGE("Couldn't allocate face metadata array");
335        return;
336    }
337
338    for (int i = 0; i < metadata->number_of_faces; i++) {
339        jobject face = env->NewObject(mFaceClass, fields.face_constructor);
340        env->SetObjectArrayElement(obj, i, face);
341
342        jobject rect = env->NewObject(mRectClass, fields.rect_constructor);
343        env->SetIntField(rect, fields.rect_left, metadata->faces[i].rect[0]);
344        env->SetIntField(rect, fields.rect_top, metadata->faces[i].rect[1]);
345        env->SetIntField(rect, fields.rect_right, metadata->faces[i].rect[2]);
346        env->SetIntField(rect, fields.rect_bottom, metadata->faces[i].rect[3]);
347
348        env->SetObjectField(face, fields.face_rect, rect);
349        env->SetIntField(face, fields.face_score, metadata->faces[i].score);
350
351        env->DeleteLocalRef(face);
352        env->DeleteLocalRef(rect);
353    }
354    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
355            mCameraJObjectWeak, msgType, 0, 0, obj);
356    env->DeleteLocalRef(obj);
357}
358
359void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
360{
361    Mutex::Autolock _l(mLock);
362    mManualBufferMode = manualMode;
363    mManualCameraCallbackSet = false;
364
365    // In order to limit the over usage of binder threads, all non-manual buffer
366    // callbacks use CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
367    //
368    // Continuous callbacks will have the callback re-registered from handleMessage.
369    // Manual buffer mode will operate as fast as possible, relying on the finite supply
370    // of buffers for throttling.
371
372    if (!installed) {
373        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
374        clearCallbackBuffers_l(env, &mCallbackBuffers);
375    } else if (mManualBufferMode) {
376        if (!mCallbackBuffers.isEmpty()) {
377            mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
378            mManualCameraCallbackSet = true;
379        }
380    } else {
381        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
382        clearCallbackBuffers_l(env, &mCallbackBuffers);
383    }
384}
385
386void JNICameraContext::addCallbackBuffer(
387        JNIEnv *env, jbyteArray cbb, int msgType)
388{
389    ALOGV("addCallbackBuffer: 0x%x", msgType);
390    if (cbb != NULL) {
391        Mutex::Autolock _l(mLock);
392        switch (msgType) {
393            case CAMERA_MSG_PREVIEW_FRAME: {
394                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
395                mCallbackBuffers.push(callbackBuffer);
396
397                ALOGV("Adding callback buffer to queue, %d total",
398                        mCallbackBuffers.size());
399
400                // We want to make sure the camera knows we're ready for the
401                // next frame. This may have come unset had we not had a
402                // callbackbuffer ready for it last time.
403                if (mManualBufferMode && !mManualCameraCallbackSet) {
404                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
405                    mManualCameraCallbackSet = true;
406                }
407                break;
408            }
409            case CAMERA_MSG_RAW_IMAGE: {
410                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
411                mRawImageCallbackBuffers.push(callbackBuffer);
412                break;
413            }
414            default: {
415                jniThrowException(env,
416                        "java/lang/IllegalArgumentException",
417                        "Unsupported message type");
418                return;
419            }
420        }
421    } else {
422       LOGE("Null byte array!");
423    }
424}
425
426void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
427{
428    clearCallbackBuffers_l(env, &mCallbackBuffers);
429    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
430}
431
432void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
433    ALOGV("Clearing callback buffers, %d remained", buffers->size());
434    while (!buffers->isEmpty()) {
435        env->DeleteGlobalRef(buffers->top());
436        buffers->pop();
437    }
438}
439
440static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
441{
442    return Camera::getNumberOfCameras();
443}
444
445static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
446    jint cameraId, jobject info_obj)
447{
448    CameraInfo cameraInfo;
449    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
450    if (rc != NO_ERROR) {
451        jniThrowRuntimeException(env, "Fail to get camera info");
452        return;
453    }
454    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
455    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
456}
457
458// connect to camera service
459static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
460    jobject weak_this, jint cameraId)
461{
462    sp<Camera> camera = Camera::connect(cameraId);
463
464    if (camera == NULL) {
465        jniThrowRuntimeException(env, "Fail to connect to camera service");
466        return;
467    }
468
469    // make sure camera hardware is alive
470    if (camera->getStatus() != NO_ERROR) {
471        jniThrowRuntimeException(env, "Camera initialization failed");
472        return;
473    }
474
475    jclass clazz = env->GetObjectClass(thiz);
476    if (clazz == NULL) {
477        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
478        return;
479    }
480
481    // We use a weak reference so the Camera object can be garbage collected.
482    // The reference is only used as a proxy for callbacks.
483    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
484    context->incStrong(thiz);
485    camera->setListener(context);
486
487    // save context in opaque field
488    env->SetIntField(thiz, fields.context, (int)context.get());
489}
490
491// disconnect from camera service
492// It's okay to call this when the native camera context is already null.
493// This handles the case where the user has called release() and the
494// finalizer is invoked later.
495static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
496{
497    // TODO: Change to ALOGV
498    ALOGV("release camera");
499    JNICameraContext* context = NULL;
500    sp<Camera> camera;
501    {
502        Mutex::Autolock _l(sLock);
503        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
504
505        // Make sure we do not attempt to callback on a deleted Java object.
506        env->SetIntField(thiz, fields.context, 0);
507    }
508
509    // clean up if release has not been called before
510    if (context != NULL) {
511        camera = context->getCamera();
512        context->release();
513        ALOGV("native_release: context=%p camera=%p", context, camera.get());
514
515        // clear callbacks
516        if (camera != NULL) {
517            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
518            camera->disconnect();
519        }
520
521        // remove context to prevent further Java access
522        context->decStrong(thiz);
523    }
524}
525
526static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface)
527{
528    ALOGV("setPreviewDisplay");
529    sp<Camera> camera = get_native_camera(env, thiz, NULL);
530    if (camera == 0) return;
531
532    sp<Surface> surface = NULL;
533    if (jSurface != NULL) {
534        surface = reinterpret_cast<Surface*>(env->GetIntField(jSurface, fields.surface));
535    }
536    if (camera->setPreviewDisplay(surface) != NO_ERROR) {
537        jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed");
538    }
539}
540
541static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
542        jobject thiz, jobject jSurfaceTexture)
543{
544    ALOGV("setPreviewTexture");
545    sp<Camera> camera = get_native_camera(env, thiz, NULL);
546    if (camera == 0) return;
547
548    sp<SurfaceTexture> surfaceTexture = NULL;
549    if (jSurfaceTexture != NULL) {
550        surfaceTexture = reinterpret_cast<SurfaceTexture*>(env->GetIntField(
551                jSurfaceTexture, fields.surfaceTexture));
552    }
553    if (camera->setPreviewTexture(surfaceTexture) != NO_ERROR) {
554        jniThrowException(env, "java/io/IOException",
555                "setPreviewTexture failed");
556    }
557}
558
559static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
560{
561    ALOGV("startPreview");
562    sp<Camera> camera = get_native_camera(env, thiz, NULL);
563    if (camera == 0) return;
564
565    if (camera->startPreview() != NO_ERROR) {
566        jniThrowRuntimeException(env, "startPreview failed");
567        return;
568    }
569}
570
571static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
572{
573    ALOGV("stopPreview");
574    sp<Camera> c = get_native_camera(env, thiz, NULL);
575    if (c == 0) return;
576
577    c->stopPreview();
578}
579
580static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
581{
582    ALOGV("previewEnabled");
583    sp<Camera> c = get_native_camera(env, thiz, NULL);
584    if (c == 0) return false;
585
586    return c->previewEnabled();
587}
588
589static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
590{
591    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
592    // Important: Only install preview_callback if the Java code has called
593    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
594    // each preview frame for nothing.
595    JNICameraContext* context;
596    sp<Camera> camera = get_native_camera(env, thiz, &context);
597    if (camera == 0) return;
598
599    // setCallbackMode will take care of setting the context flags and calling
600    // camera->setPreviewCallbackFlags within a mutex for us.
601    context->setCallbackMode(env, installed, manualBuffer);
602}
603
604static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
605    ALOGV("addCallbackBuffer: 0x%x", msgType);
606
607    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
608
609    if (context != NULL) {
610        context->addCallbackBuffer(env, bytes, msgType);
611    }
612}
613
614static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
615{
616    ALOGV("autoFocus");
617    JNICameraContext* context;
618    sp<Camera> c = get_native_camera(env, thiz, &context);
619    if (c == 0) return;
620
621    if (c->autoFocus() != NO_ERROR) {
622        jniThrowRuntimeException(env, "autoFocus failed");
623    }
624}
625
626static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
627{
628    ALOGV("cancelAutoFocus");
629    JNICameraContext* context;
630    sp<Camera> c = get_native_camera(env, thiz, &context);
631    if (c == 0) return;
632
633    if (c->cancelAutoFocus() != NO_ERROR) {
634        jniThrowRuntimeException(env, "cancelAutoFocus failed");
635    }
636}
637
638static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
639{
640    ALOGV("takePicture");
641    JNICameraContext* context;
642    sp<Camera> camera = get_native_camera(env, thiz, &context);
643    if (camera == 0) return;
644
645    /*
646     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
647     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
648     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
649     * is enabled to receive the callback notification but no data.
650     *
651     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
652     * Java application.
653     */
654    if (msgType & CAMERA_MSG_RAW_IMAGE) {
655        ALOGV("Enable raw image callback buffer");
656        if (!context->isRawImageCallbackBufferAvailable()) {
657            ALOGV("Enable raw image notification, since no callback buffer exists");
658            msgType &= ~CAMERA_MSG_RAW_IMAGE;
659            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
660        }
661    }
662
663    if (camera->takePicture(msgType) != NO_ERROR) {
664        jniThrowRuntimeException(env, "takePicture failed");
665        return;
666    }
667}
668
669static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
670{
671    ALOGV("setParameters");
672    sp<Camera> camera = get_native_camera(env, thiz, NULL);
673    if (camera == 0) return;
674
675    const jchar* str = env->GetStringCritical(params, 0);
676    String8 params8;
677    if (params) {
678        params8 = String8(str, env->GetStringLength(params));
679        env->ReleaseStringCritical(params, str);
680    }
681    if (camera->setParameters(params8) != NO_ERROR) {
682        jniThrowRuntimeException(env, "setParameters failed");
683        return;
684    }
685}
686
687static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
688{
689    ALOGV("getParameters");
690    sp<Camera> camera = get_native_camera(env, thiz, NULL);
691    if (camera == 0) return 0;
692
693    return env->NewStringUTF(camera->getParameters().string());
694}
695
696static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
697{
698    ALOGV("reconnect");
699    sp<Camera> camera = get_native_camera(env, thiz, NULL);
700    if (camera == 0) return;
701
702    if (camera->reconnect() != NO_ERROR) {
703        jniThrowException(env, "java/io/IOException", "reconnect failed");
704        return;
705    }
706}
707
708static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
709{
710    ALOGV("lock");
711    sp<Camera> camera = get_native_camera(env, thiz, NULL);
712    if (camera == 0) return;
713
714    if (camera->lock() != NO_ERROR) {
715        jniThrowRuntimeException(env, "lock failed");
716    }
717}
718
719static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
720{
721    ALOGV("unlock");
722    sp<Camera> camera = get_native_camera(env, thiz, NULL);
723    if (camera == 0) return;
724
725    if (camera->unlock() != NO_ERROR) {
726        jniThrowRuntimeException(env, "unlock failed");
727    }
728}
729
730static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
731{
732    ALOGV("startSmoothZoom");
733    sp<Camera> camera = get_native_camera(env, thiz, NULL);
734    if (camera == 0) return;
735
736    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
737    if (rc == BAD_VALUE) {
738        char msg[64];
739        sprintf(msg, "invalid zoom value=%d", value);
740        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
741    } else if (rc != NO_ERROR) {
742        jniThrowRuntimeException(env, "start smooth zoom failed");
743    }
744}
745
746static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
747{
748    ALOGV("stopSmoothZoom");
749    sp<Camera> camera = get_native_camera(env, thiz, NULL);
750    if (camera == 0) return;
751
752    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
753        jniThrowRuntimeException(env, "stop smooth zoom failed");
754    }
755}
756
757static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
758        jint value)
759{
760    ALOGV("setDisplayOrientation");
761    sp<Camera> camera = get_native_camera(env, thiz, NULL);
762    if (camera == 0) return;
763
764    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
765        jniThrowRuntimeException(env, "set display orientation failed");
766    }
767}
768
769static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
770        jint type)
771{
772    ALOGV("startFaceDetection");
773    JNICameraContext* context;
774    sp<Camera> camera = get_native_camera(env, thiz, &context);
775    if (camera == 0) return;
776
777    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
778    if (rc == BAD_VALUE) {
779        char msg[64];
780        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
781        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
782    } else if (rc != NO_ERROR) {
783        jniThrowRuntimeException(env, "start face detection failed");
784    }
785}
786
787static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
788{
789    ALOGV("stopFaceDetection");
790    sp<Camera> camera = get_native_camera(env, thiz, NULL);
791    if (camera == 0) return;
792
793    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
794        jniThrowRuntimeException(env, "stop face detection failed");
795    }
796}
797
798static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
799{
800    ALOGV("enableFocusMoveCallback");
801    sp<Camera> camera = get_native_camera(env, thiz, NULL);
802    if (camera == 0) return;
803
804    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
805        jniThrowRuntimeException(env, "enable focus move callback failed");
806    }
807}
808
809//-------------------------------------------------
810
811static JNINativeMethod camMethods[] = {
812  { "getNumberOfCameras",
813    "()I",
814    (void *)android_hardware_Camera_getNumberOfCameras },
815  { "getCameraInfo",
816    "(ILandroid/hardware/Camera$CameraInfo;)V",
817    (void*)android_hardware_Camera_getCameraInfo },
818  { "native_setup",
819    "(Ljava/lang/Object;I)V",
820    (void*)android_hardware_Camera_native_setup },
821  { "native_release",
822    "()V",
823    (void*)android_hardware_Camera_release },
824  { "setPreviewDisplay",
825    "(Landroid/view/Surface;)V",
826    (void *)android_hardware_Camera_setPreviewDisplay },
827  { "setPreviewTexture",
828    "(Landroid/graphics/SurfaceTexture;)V",
829    (void *)android_hardware_Camera_setPreviewTexture },
830  { "startPreview",
831    "()V",
832    (void *)android_hardware_Camera_startPreview },
833  { "_stopPreview",
834    "()V",
835    (void *)android_hardware_Camera_stopPreview },
836  { "previewEnabled",
837    "()Z",
838    (void *)android_hardware_Camera_previewEnabled },
839  { "setHasPreviewCallback",
840    "(ZZ)V",
841    (void *)android_hardware_Camera_setHasPreviewCallback },
842  { "_addCallbackBuffer",
843    "([BI)V",
844    (void *)android_hardware_Camera_addCallbackBuffer },
845  { "native_autoFocus",
846    "()V",
847    (void *)android_hardware_Camera_autoFocus },
848  { "native_cancelAutoFocus",
849    "()V",
850    (void *)android_hardware_Camera_cancelAutoFocus },
851  { "native_takePicture",
852    "(I)V",
853    (void *)android_hardware_Camera_takePicture },
854  { "native_setParameters",
855    "(Ljava/lang/String;)V",
856    (void *)android_hardware_Camera_setParameters },
857  { "native_getParameters",
858    "()Ljava/lang/String;",
859    (void *)android_hardware_Camera_getParameters },
860  { "reconnect",
861    "()V",
862    (void*)android_hardware_Camera_reconnect },
863  { "lock",
864    "()V",
865    (void*)android_hardware_Camera_lock },
866  { "unlock",
867    "()V",
868    (void*)android_hardware_Camera_unlock },
869  { "startSmoothZoom",
870    "(I)V",
871    (void *)android_hardware_Camera_startSmoothZoom },
872  { "stopSmoothZoom",
873    "()V",
874    (void *)android_hardware_Camera_stopSmoothZoom },
875  { "setDisplayOrientation",
876    "(I)V",
877    (void *)android_hardware_Camera_setDisplayOrientation },
878  { "_startFaceDetection",
879    "(I)V",
880    (void *)android_hardware_Camera_startFaceDetection },
881  { "_stopFaceDetection",
882    "()V",
883    (void *)android_hardware_Camera_stopFaceDetection},
884  { "enableFocusMoveCallback",
885    "(I)V",
886    (void *)android_hardware_Camera_enableFocusMoveCallback},
887};
888
889struct field {
890    const char *class_name;
891    const char *field_name;
892    const char *field_type;
893    jfieldID   *jfield;
894};
895
896static int find_fields(JNIEnv *env, field *fields, int count)
897{
898    for (int i = 0; i < count; i++) {
899        field *f = &fields[i];
900        jclass clazz = env->FindClass(f->class_name);
901        if (clazz == NULL) {
902            LOGE("Can't find %s", f->class_name);
903            return -1;
904        }
905
906        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
907        if (field == NULL) {
908            LOGE("Can't find %s.%s", f->class_name, f->field_name);
909            return -1;
910        }
911
912        *(f->jfield) = field;
913    }
914
915    return 0;
916}
917
918// Get all the required offsets in java class and register native functions
919int register_android_hardware_Camera(JNIEnv *env)
920{
921    field fields_to_find[] = {
922        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
923        { "android/view/Surface",    ANDROID_VIEW_SURFACE_JNI_ID, "I", &fields.surface },
924        { "android/graphics/SurfaceTexture",
925          ANDROID_GRAPHICS_SURFACETEXTURE_JNI_ID, "I", &fields.surfaceTexture },
926        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
927        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
928        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
929        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
930        { "android/graphics/Rect", "left", "I", &fields.rect_left },
931        { "android/graphics/Rect", "top", "I", &fields.rect_top },
932        { "android/graphics/Rect", "right", "I", &fields.rect_right },
933        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
934    };
935
936    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
937        return -1;
938
939    jclass clazz = env->FindClass("android/hardware/Camera");
940    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
941                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
942    if (fields.post_event == NULL) {
943        LOGE("Can't find android/hardware/Camera.postEventFromNative");
944        return -1;
945    }
946
947    clazz = env->FindClass("android/graphics/Rect");
948    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
949    if (fields.rect_constructor == NULL) {
950        LOGE("Can't find android/graphics/Rect.Rect()");
951        return -1;
952    }
953
954    clazz = env->FindClass("android/hardware/Camera$Face");
955    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
956    if (fields.face_constructor == NULL) {
957        LOGE("Can't find android/hardware/Camera$Face.Face()");
958        return -1;
959    }
960
961    // Register native functions
962    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
963                                              camMethods, NELEM(camMethods));
964}
965