android_hardware_Camera.cpp revision 788717ca599c714d58b2cb5deea1d37b4a711c07 
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(thiz);
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(thiz);
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<Surface> surface;
548    if (jSurface) {
549        surface = android_view_Surface_getSurface(env, jSurface);
550    }
551
552    if (camera->setPreviewDisplay(surface) != NO_ERROR) {
553        jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed");
554    }
555}
556
557static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
558        jobject thiz, jobject jSurfaceTexture)
559{
560    ALOGV("setPreviewTexture");
561    sp<Camera> camera = get_native_camera(env, thiz, NULL);
562    if (camera == 0) return;
563
564    sp<BufferQueue> bufferQueue = NULL;
565    if (jSurfaceTexture != NULL) {
566        sp<GLConsumer> surfaceTexture =
567            SurfaceTexture_getSurfaceTexture(env, jSurfaceTexture);
568        if (surfaceTexture != NULL) {
569            bufferQueue = surfaceTexture->getBufferQueue();
570        }
571        else {
572            jniThrowException(env, "java/lang/IllegalArgumentException",
573                    "SurfaceTexture already released in setPreviewTexture");
574            return;
575        }
576
577    }
578
579    if (camera->setPreviewTexture(bufferQueue) != NO_ERROR) {
580        jniThrowException(env, "java/io/IOException",
581                "setPreviewTexture failed");
582    }
583}
584
585static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
586{
587    ALOGV("startPreview");
588    sp<Camera> camera = get_native_camera(env, thiz, NULL);
589    if (camera == 0) return;
590
591    if (camera->startPreview() != NO_ERROR) {
592        jniThrowRuntimeException(env, "startPreview failed");
593        return;
594    }
595}
596
597static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
598{
599    ALOGV("stopPreview");
600    sp<Camera> c = get_native_camera(env, thiz, NULL);
601    if (c == 0) return;
602
603    c->stopPreview();
604}
605
606static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
607{
608    ALOGV("previewEnabled");
609    sp<Camera> c = get_native_camera(env, thiz, NULL);
610    if (c == 0) return false;
611
612    return c->previewEnabled();
613}
614
615static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
616{
617    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
618    // Important: Only install preview_callback if the Java code has called
619    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
620    // each preview frame for nothing.
621    JNICameraContext* context;
622    sp<Camera> camera = get_native_camera(env, thiz, &context);
623    if (camera == 0) return;
624
625    // setCallbackMode will take care of setting the context flags and calling
626    // camera->setPreviewCallbackFlags within a mutex for us.
627    context->setCallbackMode(env, installed, manualBuffer);
628}
629
630static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
631    ALOGV("addCallbackBuffer: 0x%x", msgType);
632
633    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
634
635    if (context != NULL) {
636        context->addCallbackBuffer(env, bytes, msgType);
637    }
638}
639
640static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
641{
642    ALOGV("autoFocus");
643    JNICameraContext* context;
644    sp<Camera> c = get_native_camera(env, thiz, &context);
645    if (c == 0) return;
646
647    if (c->autoFocus() != NO_ERROR) {
648        jniThrowRuntimeException(env, "autoFocus failed");
649    }
650}
651
652static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
653{
654    ALOGV("cancelAutoFocus");
655    JNICameraContext* context;
656    sp<Camera> c = get_native_camera(env, thiz, &context);
657    if (c == 0) return;
658
659    if (c->cancelAutoFocus() != NO_ERROR) {
660        jniThrowRuntimeException(env, "cancelAutoFocus failed");
661    }
662}
663
664static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
665{
666    ALOGV("takePicture");
667    JNICameraContext* context;
668    sp<Camera> camera = get_native_camera(env, thiz, &context);
669    if (camera == 0) return;
670
671    /*
672     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
673     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
674     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
675     * is enabled to receive the callback notification but no data.
676     *
677     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
678     * Java application.
679     */
680    if (msgType & CAMERA_MSG_RAW_IMAGE) {
681        ALOGV("Enable raw image callback buffer");
682        if (!context->isRawImageCallbackBufferAvailable()) {
683            ALOGV("Enable raw image notification, since no callback buffer exists");
684            msgType &= ~CAMERA_MSG_RAW_IMAGE;
685            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
686        }
687    }
688
689    if (camera->takePicture(msgType) != NO_ERROR) {
690        jniThrowRuntimeException(env, "takePicture failed");
691        return;
692    }
693}
694
695static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
696{
697    ALOGV("setParameters");
698    sp<Camera> camera = get_native_camera(env, thiz, NULL);
699    if (camera == 0) return;
700
701    const jchar* str = env->GetStringCritical(params, 0);
702    String8 params8;
703    if (params) {
704        params8 = String8(str, env->GetStringLength(params));
705        env->ReleaseStringCritical(params, str);
706    }
707    if (camera->setParameters(params8) != NO_ERROR) {
708        jniThrowRuntimeException(env, "setParameters failed");
709        return;
710    }
711}
712
713static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
714{
715    ALOGV("getParameters");
716    sp<Camera> camera = get_native_camera(env, thiz, NULL);
717    if (camera == 0) return 0;
718
719    String8 params8 = camera->getParameters();
720    if (params8.isEmpty()) {
721        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
722        return 0;
723    }
724    return env->NewStringUTF(params8.string());
725}
726
727static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
728{
729    ALOGV("reconnect");
730    sp<Camera> camera = get_native_camera(env, thiz, NULL);
731    if (camera == 0) return;
732
733    if (camera->reconnect() != NO_ERROR) {
734        jniThrowException(env, "java/io/IOException", "reconnect failed");
735        return;
736    }
737}
738
739static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
740{
741    ALOGV("lock");
742    sp<Camera> camera = get_native_camera(env, thiz, NULL);
743    if (camera == 0) return;
744
745    if (camera->lock() != NO_ERROR) {
746        jniThrowRuntimeException(env, "lock failed");
747    }
748}
749
750static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
751{
752    ALOGV("unlock");
753    sp<Camera> camera = get_native_camera(env, thiz, NULL);
754    if (camera == 0) return;
755
756    if (camera->unlock() != NO_ERROR) {
757        jniThrowRuntimeException(env, "unlock failed");
758    }
759}
760
761static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
762{
763    ALOGV("startSmoothZoom");
764    sp<Camera> camera = get_native_camera(env, thiz, NULL);
765    if (camera == 0) return;
766
767    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
768    if (rc == BAD_VALUE) {
769        char msg[64];
770        sprintf(msg, "invalid zoom value=%d", value);
771        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
772    } else if (rc != NO_ERROR) {
773        jniThrowRuntimeException(env, "start smooth zoom failed");
774    }
775}
776
777static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
778{
779    ALOGV("stopSmoothZoom");
780    sp<Camera> camera = get_native_camera(env, thiz, NULL);
781    if (camera == 0) return;
782
783    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
784        jniThrowRuntimeException(env, "stop smooth zoom failed");
785    }
786}
787
788static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
789        jint value)
790{
791    ALOGV("setDisplayOrientation");
792    sp<Camera> camera = get_native_camera(env, thiz, NULL);
793    if (camera == 0) return;
794
795    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
796        jniThrowRuntimeException(env, "set display orientation failed");
797    }
798}
799
800static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
801        jboolean enabled)
802{
803    ALOGV("enableShutterSound");
804    sp<Camera> camera = get_native_camera(env, thiz, NULL);
805    if (camera == 0) return JNI_FALSE;
806
807    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
808    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
809    if (rc == NO_ERROR) {
810        return JNI_TRUE;
811    } else if (rc == PERMISSION_DENIED) {
812        return JNI_FALSE;
813    } else {
814        jniThrowRuntimeException(env, "enable shutter sound failed");
815        return JNI_FALSE;
816    }
817}
818
819static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
820        jint type)
821{
822    ALOGV("startFaceDetection");
823    JNICameraContext* context;
824    sp<Camera> camera = get_native_camera(env, thiz, &context);
825    if (camera == 0) return;
826
827    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
828    if (rc == BAD_VALUE) {
829        char msg[64];
830        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
831        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
832    } else if (rc != NO_ERROR) {
833        jniThrowRuntimeException(env, "start face detection failed");
834    }
835}
836
837static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
838{
839    ALOGV("stopFaceDetection");
840    sp<Camera> camera = get_native_camera(env, thiz, NULL);
841    if (camera == 0) return;
842
843    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
844        jniThrowRuntimeException(env, "stop face detection failed");
845    }
846}
847
848static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
849{
850    ALOGV("enableFocusMoveCallback");
851    sp<Camera> camera = get_native_camera(env, thiz, NULL);
852    if (camera == 0) return;
853
854    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
855        jniThrowRuntimeException(env, "enable focus move callback failed");
856    }
857}
858
859//-------------------------------------------------
860
861static JNINativeMethod camMethods[] = {
862  { "getNumberOfCameras",
863    "()I",
864    (void *)android_hardware_Camera_getNumberOfCameras },
865  { "_getCameraInfo",
866    "(ILandroid/hardware/Camera$CameraInfo;)V",
867    (void*)android_hardware_Camera_getCameraInfo },
868  { "native_setup",
869    "(Ljava/lang/Object;ILjava/lang/String;)V",
870    (void*)android_hardware_Camera_native_setup },
871  { "native_release",
872    "()V",
873    (void*)android_hardware_Camera_release },
874  { "setPreviewDisplay",
875    "(Landroid/view/Surface;)V",
876    (void *)android_hardware_Camera_setPreviewDisplay },
877  { "setPreviewTexture",
878    "(Landroid/graphics/SurfaceTexture;)V",
879    (void *)android_hardware_Camera_setPreviewTexture },
880  { "startPreview",
881    "()V",
882    (void *)android_hardware_Camera_startPreview },
883  { "_stopPreview",
884    "()V",
885    (void *)android_hardware_Camera_stopPreview },
886  { "previewEnabled",
887    "()Z",
888    (void *)android_hardware_Camera_previewEnabled },
889  { "setHasPreviewCallback",
890    "(ZZ)V",
891    (void *)android_hardware_Camera_setHasPreviewCallback },
892  { "_addCallbackBuffer",
893    "([BI)V",
894    (void *)android_hardware_Camera_addCallbackBuffer },
895  { "native_autoFocus",
896    "()V",
897    (void *)android_hardware_Camera_autoFocus },
898  { "native_cancelAutoFocus",
899    "()V",
900    (void *)android_hardware_Camera_cancelAutoFocus },
901  { "native_takePicture",
902    "(I)V",
903    (void *)android_hardware_Camera_takePicture },
904  { "native_setParameters",
905    "(Ljava/lang/String;)V",
906    (void *)android_hardware_Camera_setParameters },
907  { "native_getParameters",
908    "()Ljava/lang/String;",
909    (void *)android_hardware_Camera_getParameters },
910  { "reconnect",
911    "()V",
912    (void*)android_hardware_Camera_reconnect },
913  { "lock",
914    "()V",
915    (void*)android_hardware_Camera_lock },
916  { "unlock",
917    "()V",
918    (void*)android_hardware_Camera_unlock },
919  { "startSmoothZoom",
920    "(I)V",
921    (void *)android_hardware_Camera_startSmoothZoom },
922  { "stopSmoothZoom",
923    "()V",
924    (void *)android_hardware_Camera_stopSmoothZoom },
925  { "setDisplayOrientation",
926    "(I)V",
927    (void *)android_hardware_Camera_setDisplayOrientation },
928  { "_enableShutterSound",
929    "(Z)Z",
930    (void *)android_hardware_Camera_enableShutterSound },
931  { "_startFaceDetection",
932    "(I)V",
933    (void *)android_hardware_Camera_startFaceDetection },
934  { "_stopFaceDetection",
935    "()V",
936    (void *)android_hardware_Camera_stopFaceDetection},
937  { "enableFocusMoveCallback",
938    "(I)V",
939    (void *)android_hardware_Camera_enableFocusMoveCallback},
940};
941
942struct field {
943    const char *class_name;
944    const char *field_name;
945    const char *field_type;
946    jfieldID   *jfield;
947};
948
949static int find_fields(JNIEnv *env, field *fields, int count)
950{
951    for (int i = 0; i < count; i++) {
952        field *f = &fields[i];
953        jclass clazz = env->FindClass(f->class_name);
954        if (clazz == NULL) {
955            ALOGE("Can't find %s", f->class_name);
956            return -1;
957        }
958
959        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
960        if (field == NULL) {
961            ALOGE("Can't find %s.%s", f->class_name, f->field_name);
962            return -1;
963        }
964
965        *(f->jfield) = field;
966    }
967
968    return 0;
969}
970
971// Get all the required offsets in java class and register native functions
972int register_android_hardware_Camera(JNIEnv *env)
973{
974    field fields_to_find[] = {
975        { "android/hardware/Camera", "mNativeContext",   "I", &fields.context },
976        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
977        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
978        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
979          &fields.canDisableShutterSound },
980        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
981        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
982        { "android/graphics/Rect", "left", "I", &fields.rect_left },
983        { "android/graphics/Rect", "top", "I", &fields.rect_top },
984        { "android/graphics/Rect", "right", "I", &fields.rect_right },
985        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
986    };
987
988    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
989        return -1;
990
991    jclass clazz = env->FindClass("android/hardware/Camera");
992    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
993                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
994    if (fields.post_event == NULL) {
995        ALOGE("Can't find android/hardware/Camera.postEventFromNative");
996        return -1;
997    }
998
999    clazz = env->FindClass("android/graphics/Rect");
1000    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
1001    if (fields.rect_constructor == NULL) {
1002        ALOGE("Can't find android/graphics/Rect.Rect()");
1003        return -1;
1004    }
1005
1006    clazz = env->FindClass("android/hardware/Camera$Face");
1007    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
1008    if (fields.face_constructor == NULL) {
1009        ALOGE("Can't find android/hardware/Camera$Face.Face()");
1010        return -1;
1011    }
1012
1013    // Register native functions
1014    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
1015                                              camMethods, NELEM(camMethods));
1016}
1017