android_hardware_Camera.cpp revision 4c913801141163362dd5bb7c9784c83f69c11054 
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, jint halVersion, 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;
478    if (halVersion == ICameraService::CAMERA_HAL_API_VERSION_UNSPECIFIED) {
479        // Default path: hal version is unspecified, do normal camera open.
480        camera = Camera::connect(cameraId, clientName,
481                Camera::USE_CALLING_UID);
482    } else {
483        jint status = Camera::connectLegacy(cameraId, halVersion, clientName,
484                Camera::USE_CALLING_UID, camera);
485        if (status != NO_ERROR) {
486            return status;
487        }
488    }
489
490    if (camera == NULL) {
491        return -EACCES;
492    }
493
494    // make sure camera hardware is alive
495    if (camera->getStatus() != NO_ERROR) {
496        return NO_INIT;
497    }
498
499    jclass clazz = env->GetObjectClass(thiz);
500    if (clazz == NULL) {
501        // This should never happen
502        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
503        return INVALID_OPERATION;
504    }
505
506    // We use a weak reference so the Camera object can be garbage collected.
507    // The reference is only used as a proxy for callbacks.
508    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
509    context->incStrong((void*)android_hardware_Camera_native_setup);
510    camera->setListener(context);
511
512    // save context in opaque field
513    env->SetLongField(thiz, fields.context, (jlong)context.get());
514    return NO_ERROR;
515}
516
517// disconnect from camera service
518// It's okay to call this when the native camera context is already null.
519// This handles the case where the user has called release() and the
520// finalizer is invoked later.
521static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
522{
523    ALOGV("release camera");
524    JNICameraContext* context = NULL;
525    sp<Camera> camera;
526    {
527        Mutex::Autolock _l(sLock);
528        context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
529
530        // Make sure we do not attempt to callback on a deleted Java object.
531        env->SetLongField(thiz, fields.context, 0);
532    }
533
534    // clean up if release has not been called before
535    if (context != NULL) {
536        camera = context->getCamera();
537        context->release();
538        ALOGV("native_release: context=%p camera=%p", context, camera.get());
539
540        // clear callbacks
541        if (camera != NULL) {
542            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
543            camera->disconnect();
544        }
545
546        // remove context to prevent further Java access
547        context->decStrong((void*)android_hardware_Camera_native_setup);
548    }
549}
550
551static void android_hardware_Camera_setPreviewSurface(JNIEnv *env, jobject thiz, jobject jSurface)
552{
553    ALOGV("setPreviewSurface");
554    sp<Camera> camera = get_native_camera(env, thiz, NULL);
555    if (camera == 0) return;
556
557    sp<IGraphicBufferProducer> gbp;
558    sp<Surface> surface;
559    if (jSurface) {
560        surface = android_view_Surface_getSurface(env, jSurface);
561        if (surface != NULL) {
562            gbp = surface->getIGraphicBufferProducer();
563        }
564    }
565
566    if (camera->setPreviewTarget(gbp) != NO_ERROR) {
567        jniThrowException(env, "java/io/IOException", "setPreviewTexture failed");
568    }
569}
570
571static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
572        jobject thiz, jobject jSurfaceTexture)
573{
574    ALOGV("setPreviewTexture");
575    sp<Camera> camera = get_native_camera(env, thiz, NULL);
576    if (camera == 0) return;
577
578    sp<IGraphicBufferProducer> producer = NULL;
579    if (jSurfaceTexture != NULL) {
580        producer = SurfaceTexture_getProducer(env, jSurfaceTexture);
581        if (producer == NULL) {
582            jniThrowException(env, "java/lang/IllegalArgumentException",
583                    "SurfaceTexture already released in setPreviewTexture");
584            return;
585        }
586
587    }
588
589    if (camera->setPreviewTarget(producer) != NO_ERROR) {
590        jniThrowException(env, "java/io/IOException",
591                "setPreviewTexture failed");
592    }
593}
594
595static void android_hardware_Camera_setPreviewCallbackSurface(JNIEnv *env,
596        jobject thiz, jobject jSurface)
597{
598    ALOGV("setPreviewCallbackSurface");
599    JNICameraContext* context;
600    sp<Camera> camera = get_native_camera(env, thiz, &context);
601    if (camera == 0) return;
602
603    sp<IGraphicBufferProducer> gbp;
604    sp<Surface> surface;
605    if (jSurface) {
606        surface = android_view_Surface_getSurface(env, jSurface);
607        if (surface != NULL) {
608            gbp = surface->getIGraphicBufferProducer();
609        }
610    }
611    // Clear out normal preview callbacks
612    context->setCallbackMode(env, false, false);
613    // Then set up callback surface
614    if (camera->setPreviewCallbackTarget(gbp) != NO_ERROR) {
615        jniThrowException(env, "java/io/IOException", "setPreviewCallbackTarget failed");
616    }
617}
618
619static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
620{
621    ALOGV("startPreview");
622    sp<Camera> camera = get_native_camera(env, thiz, NULL);
623    if (camera == 0) return;
624
625    if (camera->startPreview() != NO_ERROR) {
626        jniThrowRuntimeException(env, "startPreview failed");
627        return;
628    }
629}
630
631static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
632{
633    ALOGV("stopPreview");
634    sp<Camera> c = get_native_camera(env, thiz, NULL);
635    if (c == 0) return;
636
637    c->stopPreview();
638}
639
640static jboolean android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
641{
642    ALOGV("previewEnabled");
643    sp<Camera> c = get_native_camera(env, thiz, NULL);
644    if (c == 0) return JNI_FALSE;
645
646    return c->previewEnabled() ? JNI_TRUE : JNI_FALSE;
647}
648
649static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
650{
651    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
652    // Important: Only install preview_callback if the Java code has called
653    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
654    // each preview frame for nothing.
655    JNICameraContext* context;
656    sp<Camera> camera = get_native_camera(env, thiz, &context);
657    if (camera == 0) return;
658
659    // setCallbackMode will take care of setting the context flags and calling
660    // camera->setPreviewCallbackFlags within a mutex for us.
661    context->setCallbackMode(env, installed, manualBuffer);
662}
663
664static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, jint msgType) {
665    ALOGV("addCallbackBuffer: 0x%x", msgType);
666
667    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
668
669    if (context != NULL) {
670        context->addCallbackBuffer(env, bytes, msgType);
671    }
672}
673
674static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
675{
676    ALOGV("autoFocus");
677    JNICameraContext* context;
678    sp<Camera> c = get_native_camera(env, thiz, &context);
679    if (c == 0) return;
680
681    if (c->autoFocus() != NO_ERROR) {
682        jniThrowRuntimeException(env, "autoFocus failed");
683    }
684}
685
686static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
687{
688    ALOGV("cancelAutoFocus");
689    JNICameraContext* context;
690    sp<Camera> c = get_native_camera(env, thiz, &context);
691    if (c == 0) return;
692
693    if (c->cancelAutoFocus() != NO_ERROR) {
694        jniThrowRuntimeException(env, "cancelAutoFocus failed");
695    }
696}
697
698static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, jint msgType)
699{
700    ALOGV("takePicture");
701    JNICameraContext* context;
702    sp<Camera> camera = get_native_camera(env, thiz, &context);
703    if (camera == 0) return;
704
705    /*
706     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
707     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
708     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
709     * is enabled to receive the callback notification but no data.
710     *
711     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
712     * Java application.
713     */
714    if (msgType & CAMERA_MSG_RAW_IMAGE) {
715        ALOGV("Enable raw image callback buffer");
716        if (!context->isRawImageCallbackBufferAvailable()) {
717            ALOGV("Enable raw image notification, since no callback buffer exists");
718            msgType &= ~CAMERA_MSG_RAW_IMAGE;
719            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
720        }
721    }
722
723    if (camera->takePicture(msgType) != NO_ERROR) {
724        jniThrowRuntimeException(env, "takePicture failed");
725        return;
726    }
727}
728
729static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
730{
731    ALOGV("setParameters");
732    sp<Camera> camera = get_native_camera(env, thiz, NULL);
733    if (camera == 0) return;
734
735    const jchar* str = env->GetStringCritical(params, 0);
736    String8 params8;
737    if (params) {
738        params8 = String8(str, env->GetStringLength(params));
739        env->ReleaseStringCritical(params, str);
740    }
741    if (camera->setParameters(params8) != NO_ERROR) {
742        jniThrowRuntimeException(env, "setParameters failed");
743        return;
744    }
745}
746
747static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
748{
749    ALOGV("getParameters");
750    sp<Camera> camera = get_native_camera(env, thiz, NULL);
751    if (camera == 0) return 0;
752
753    String8 params8 = camera->getParameters();
754    if (params8.isEmpty()) {
755        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
756        return 0;
757    }
758    return env->NewStringUTF(params8.string());
759}
760
761static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
762{
763    ALOGV("reconnect");
764    sp<Camera> camera = get_native_camera(env, thiz, NULL);
765    if (camera == 0) return;
766
767    if (camera->reconnect() != NO_ERROR) {
768        jniThrowException(env, "java/io/IOException", "reconnect failed");
769        return;
770    }
771}
772
773static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
774{
775    ALOGV("lock");
776    sp<Camera> camera = get_native_camera(env, thiz, NULL);
777    if (camera == 0) return;
778
779    if (camera->lock() != NO_ERROR) {
780        jniThrowRuntimeException(env, "lock failed");
781    }
782}
783
784static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
785{
786    ALOGV("unlock");
787    sp<Camera> camera = get_native_camera(env, thiz, NULL);
788    if (camera == 0) return;
789
790    if (camera->unlock() != NO_ERROR) {
791        jniThrowRuntimeException(env, "unlock failed");
792    }
793}
794
795static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
796{
797    ALOGV("startSmoothZoom");
798    sp<Camera> camera = get_native_camera(env, thiz, NULL);
799    if (camera == 0) return;
800
801    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
802    if (rc == BAD_VALUE) {
803        char msg[64];
804        sprintf(msg, "invalid zoom value=%d", value);
805        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
806    } else if (rc != NO_ERROR) {
807        jniThrowRuntimeException(env, "start smooth zoom failed");
808    }
809}
810
811static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
812{
813    ALOGV("stopSmoothZoom");
814    sp<Camera> camera = get_native_camera(env, thiz, NULL);
815    if (camera == 0) return;
816
817    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
818        jniThrowRuntimeException(env, "stop smooth zoom failed");
819    }
820}
821
822static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
823        jint value)
824{
825    ALOGV("setDisplayOrientation");
826    sp<Camera> camera = get_native_camera(env, thiz, NULL);
827    if (camera == 0) return;
828
829    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
830        jniThrowRuntimeException(env, "set display orientation failed");
831    }
832}
833
834static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
835        jboolean enabled)
836{
837    ALOGV("enableShutterSound");
838    sp<Camera> camera = get_native_camera(env, thiz, NULL);
839    if (camera == 0) return JNI_FALSE;
840
841    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
842    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
843    if (rc == NO_ERROR) {
844        return JNI_TRUE;
845    } else if (rc == PERMISSION_DENIED) {
846        return JNI_FALSE;
847    } else {
848        jniThrowRuntimeException(env, "enable shutter sound failed");
849        return JNI_FALSE;
850    }
851}
852
853static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
854        jint type)
855{
856    ALOGV("startFaceDetection");
857    JNICameraContext* context;
858    sp<Camera> camera = get_native_camera(env, thiz, &context);
859    if (camera == 0) return;
860
861    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
862    if (rc == BAD_VALUE) {
863        char msg[64];
864        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
865        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
866    } else if (rc != NO_ERROR) {
867        jniThrowRuntimeException(env, "start face detection failed");
868    }
869}
870
871static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
872{
873    ALOGV("stopFaceDetection");
874    sp<Camera> camera = get_native_camera(env, thiz, NULL);
875    if (camera == 0) return;
876
877    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
878        jniThrowRuntimeException(env, "stop face detection failed");
879    }
880}
881
882static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
883{
884    ALOGV("enableFocusMoveCallback");
885    sp<Camera> camera = get_native_camera(env, thiz, NULL);
886    if (camera == 0) return;
887
888    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
889        jniThrowRuntimeException(env, "enable focus move callback failed");
890    }
891}
892
893//-------------------------------------------------
894
895static JNINativeMethod camMethods[] = {
896  { "getNumberOfCameras",
897    "()I",
898    (void *)android_hardware_Camera_getNumberOfCameras },
899  { "_getCameraInfo",
900    "(ILandroid/hardware/Camera$CameraInfo;)V",
901    (void*)android_hardware_Camera_getCameraInfo },
902  { "native_setup",
903    "(Ljava/lang/Object;IILjava/lang/String;)I",
904    (void*)android_hardware_Camera_native_setup },
905  { "native_release",
906    "()V",
907    (void*)android_hardware_Camera_release },
908  { "setPreviewSurface",
909    "(Landroid/view/Surface;)V",
910    (void *)android_hardware_Camera_setPreviewSurface },
911  { "setPreviewTexture",
912    "(Landroid/graphics/SurfaceTexture;)V",
913    (void *)android_hardware_Camera_setPreviewTexture },
914  { "setPreviewCallbackSurface",
915    "(Landroid/view/Surface;)V",
916    (void *)android_hardware_Camera_setPreviewCallbackSurface },
917  { "startPreview",
918    "()V",
919    (void *)android_hardware_Camera_startPreview },
920  { "_stopPreview",
921    "()V",
922    (void *)android_hardware_Camera_stopPreview },
923  { "previewEnabled",
924    "()Z",
925    (void *)android_hardware_Camera_previewEnabled },
926  { "setHasPreviewCallback",
927    "(ZZ)V",
928    (void *)android_hardware_Camera_setHasPreviewCallback },
929  { "_addCallbackBuffer",
930    "([BI)V",
931    (void *)android_hardware_Camera_addCallbackBuffer },
932  { "native_autoFocus",
933    "()V",
934    (void *)android_hardware_Camera_autoFocus },
935  { "native_cancelAutoFocus",
936    "()V",
937    (void *)android_hardware_Camera_cancelAutoFocus },
938  { "native_takePicture",
939    "(I)V",
940    (void *)android_hardware_Camera_takePicture },
941  { "native_setParameters",
942    "(Ljava/lang/String;)V",
943    (void *)android_hardware_Camera_setParameters },
944  { "native_getParameters",
945    "()Ljava/lang/String;",
946    (void *)android_hardware_Camera_getParameters },
947  { "reconnect",
948    "()V",
949    (void*)android_hardware_Camera_reconnect },
950  { "lock",
951    "()V",
952    (void*)android_hardware_Camera_lock },
953  { "unlock",
954    "()V",
955    (void*)android_hardware_Camera_unlock },
956  { "startSmoothZoom",
957    "(I)V",
958    (void *)android_hardware_Camera_startSmoothZoom },
959  { "stopSmoothZoom",
960    "()V",
961    (void *)android_hardware_Camera_stopSmoothZoom },
962  { "setDisplayOrientation",
963    "(I)V",
964    (void *)android_hardware_Camera_setDisplayOrientation },
965  { "_enableShutterSound",
966    "(Z)Z",
967    (void *)android_hardware_Camera_enableShutterSound },
968  { "_startFaceDetection",
969    "(I)V",
970    (void *)android_hardware_Camera_startFaceDetection },
971  { "_stopFaceDetection",
972    "()V",
973    (void *)android_hardware_Camera_stopFaceDetection},
974  { "enableFocusMoveCallback",
975    "(I)V",
976    (void *)android_hardware_Camera_enableFocusMoveCallback},
977};
978
979struct field {
980    const char *class_name;
981    const char *field_name;
982    const char *field_type;
983    jfieldID   *jfield;
984};
985
986static int find_fields(JNIEnv *env, field *fields, int count)
987{
988    for (int i = 0; i < count; i++) {
989        field *f = &fields[i];
990        jclass clazz = env->FindClass(f->class_name);
991        if (clazz == NULL) {
992            ALOGE("Can't find %s", f->class_name);
993            return -1;
994        }
995
996        jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type);
997        if (field == NULL) {
998            ALOGE("Can't find %s.%s", f->class_name, f->field_name);
999            return -1;
1000        }
1001
1002        *(f->jfield) = field;
1003    }
1004
1005    return 0;
1006}
1007
1008// Get all the required offsets in java class and register native functions
1009int register_android_hardware_Camera(JNIEnv *env)
1010{
1011    field fields_to_find[] = {
1012        { "android/hardware/Camera", "mNativeContext",   "J", &fields.context },
1013        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
1014        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
1015        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
1016          &fields.canDisableShutterSound },
1017        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
1018        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
1019        { "android/graphics/Rect", "left", "I", &fields.rect_left },
1020        { "android/graphics/Rect", "top", "I", &fields.rect_top },
1021        { "android/graphics/Rect", "right", "I", &fields.rect_right },
1022        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
1023    };
1024
1025    if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0)
1026        return -1;
1027
1028    jclass clazz = env->FindClass("android/hardware/Camera");
1029    fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative",
1030                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
1031    if (fields.post_event == NULL) {
1032        ALOGE("Can't find android/hardware/Camera.postEventFromNative");
1033        return -1;
1034    }
1035
1036    clazz = env->FindClass("android/graphics/Rect");
1037    fields.rect_constructor = env->GetMethodID(clazz, "<init>", "()V");
1038    if (fields.rect_constructor == NULL) {
1039        ALOGE("Can't find android/graphics/Rect.Rect()");
1040        return -1;
1041    }
1042
1043    clazz = env->FindClass("android/hardware/Camera$Face");
1044    fields.face_constructor = env->GetMethodID(clazz, "<init>", "()V");
1045    if (fields.face_constructor == NULL) {
1046        ALOGE("Can't find android/hardware/Camera$Face.Face()");
1047        return -1;
1048    }
1049
1050    // Register native functions
1051    return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera",
1052                                              camMethods, NELEM(camMethods));
1053}
1054