android_hardware_Camera.cpp revision ed6b9dff563c5e22f040ff37e12c0d771e0478ae 
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 "core_jni_helpers.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
39enum {
40    // Keep up to date with Camera.java
41    CAMERA_HAL_API_VERSION_NORMAL_CONNECT = -2,
42};
43
44struct fields_t {
45    jfieldID    context;
46    jfieldID    facing;
47    jfieldID    orientation;
48    jfieldID    canDisableShutterSound;
49    jfieldID    face_rect;
50    jfieldID    face_score;
51    jfieldID    rect_left;
52    jfieldID    rect_top;
53    jfieldID    rect_right;
54    jfieldID    rect_bottom;
55    jmethodID   post_event;
56    jmethodID   rect_constructor;
57    jmethodID   face_constructor;
58};
59
60static fields_t fields;
61static Mutex sLock;
62
63// provides persistent context for calls from native code to Java
64class JNICameraContext: public CameraListener
65{
66public:
67    JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera);
68    ~JNICameraContext() { release(); }
69    virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2);
70    virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr,
71                          camera_frame_metadata_t *metadata);
72    virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr);
73    void postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata);
74    void addCallbackBuffer(JNIEnv *env, jbyteArray cbb, int msgType);
75    void setCallbackMode(JNIEnv *env, bool installed, bool manualMode);
76    sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; }
77    bool isRawImageCallbackBufferAvailable() const;
78    void release();
79
80private:
81    void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType);
82    void clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers);
83    void clearCallbackBuffers_l(JNIEnv *env);
84    jbyteArray getCallbackBuffer(JNIEnv *env, Vector<jbyteArray> *buffers, size_t bufferSize);
85
86    jobject     mCameraJObjectWeak;     // weak reference to java object
87    jclass      mCameraJClass;          // strong reference to java class
88    sp<Camera>  mCamera;                // strong reference to native object
89    jclass      mFaceClass;  // strong reference to Face class
90    jclass      mRectClass;  // strong reference to Rect class
91    Mutex       mLock;
92
93    /*
94     * Global reference application-managed raw image buffer queue.
95     *
96     * Manual-only mode is supported for raw image callbacks, which is
97     * set whenever method addCallbackBuffer() with msgType =
98     * CAMERA_MSG_RAW_IMAGE is called; otherwise, null is returned
99     * with raw image callbacks.
100     */
101    Vector<jbyteArray> mRawImageCallbackBuffers;
102
103    /*
104     * Application-managed preview buffer queue and the flags
105     * associated with the usage of the preview buffer callback.
106     */
107    Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[]
108    bool mManualBufferMode;              // Whether to use application managed buffers.
109    bool mManualCameraCallbackSet;       // Whether the callback has been set, used to
110                                         // reduce unnecessary calls to set the callback.
111};
112
113bool JNICameraContext::isRawImageCallbackBufferAvailable() const
114{
115    return !mRawImageCallbackBuffers.isEmpty();
116}
117
118sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
119{
120    sp<Camera> camera;
121    Mutex::Autolock _l(sLock);
122    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
123    if (context != NULL) {
124        camera = context->getCamera();
125    }
126    ALOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
127    if (camera == 0) {
128        jniThrowRuntimeException(env, "Method called after release()");
129    }
130
131    if (pContext != NULL) *pContext = context;
132    return camera;
133}
134
135JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera)
136{
137    mCameraJObjectWeak = env->NewGlobalRef(weak_this);
138    mCameraJClass = (jclass)env->NewGlobalRef(clazz);
139    mCamera = camera;
140
141    jclass faceClazz = env->FindClass("android/hardware/Camera$Face");
142    mFaceClass = (jclass) env->NewGlobalRef(faceClazz);
143
144    jclass rectClazz = env->FindClass("android/graphics/Rect");
145    mRectClass = (jclass) env->NewGlobalRef(rectClazz);
146
147    mManualBufferMode = false;
148    mManualCameraCallbackSet = false;
149}
150
151void JNICameraContext::release()
152{
153    ALOGV("release");
154    Mutex::Autolock _l(mLock);
155    JNIEnv *env = AndroidRuntime::getJNIEnv();
156
157    if (mCameraJObjectWeak != NULL) {
158        env->DeleteGlobalRef(mCameraJObjectWeak);
159        mCameraJObjectWeak = NULL;
160    }
161    if (mCameraJClass != NULL) {
162        env->DeleteGlobalRef(mCameraJClass);
163        mCameraJClass = NULL;
164    }
165    if (mFaceClass != NULL) {
166        env->DeleteGlobalRef(mFaceClass);
167        mFaceClass = NULL;
168    }
169    if (mRectClass != NULL) {
170        env->DeleteGlobalRef(mRectClass);
171        mRectClass = NULL;
172    }
173    clearCallbackBuffers_l(env);
174    mCamera.clear();
175}
176
177void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2)
178{
179    ALOGV("notify");
180
181    // VM pointer will be NULL if object is released
182    Mutex::Autolock _l(mLock);
183    if (mCameraJObjectWeak == NULL) {
184        ALOGW("callback on dead camera object");
185        return;
186    }
187    JNIEnv *env = AndroidRuntime::getJNIEnv();
188
189    /*
190     * If the notification or msgType is CAMERA_MSG_RAW_IMAGE_NOTIFY, change it
191     * to CAMERA_MSG_RAW_IMAGE since CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed
192     * to the Java app.
193     */
194    if (msgType == CAMERA_MSG_RAW_IMAGE_NOTIFY) {
195        msgType = CAMERA_MSG_RAW_IMAGE;
196    }
197
198    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
199            mCameraJObjectWeak, msgType, ext1, ext2, NULL);
200}
201
202jbyteArray JNICameraContext::getCallbackBuffer(
203        JNIEnv* env, Vector<jbyteArray>* buffers, size_t bufferSize)
204{
205    jbyteArray obj = NULL;
206
207    // Vector access should be protected by lock in postData()
208    if (!buffers->isEmpty()) {
209        ALOGV("Using callback buffer from queue of length %zu", buffers->size());
210        jbyteArray globalBuffer = buffers->itemAt(0);
211        buffers->removeAt(0);
212
213        obj = (jbyteArray)env->NewLocalRef(globalBuffer);
214        env->DeleteGlobalRef(globalBuffer);
215
216        if (obj != NULL) {
217            jsize bufferLength = env->GetArrayLength(obj);
218            if ((int)bufferLength < (int)bufferSize) {
219                ALOGE("Callback buffer was too small! Expected %zu bytes, but got %d bytes!",
220                    bufferSize, bufferLength);
221                env->DeleteLocalRef(obj);
222                return NULL;
223            }
224        }
225    }
226
227    return obj;
228}
229
230void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType)
231{
232    jbyteArray obj = NULL;
233
234    // allocate Java byte array and copy data
235    if (dataPtr != NULL) {
236        ssize_t offset;
237        size_t size;
238        sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size);
239        ALOGV("copyAndPost: off=%zd, size=%zu", offset, size);
240        uint8_t *heapBase = (uint8_t*)heap->base();
241
242        if (heapBase != NULL) {
243            const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset);
244
245            if (msgType == CAMERA_MSG_RAW_IMAGE) {
246                obj = getCallbackBuffer(env, &mRawImageCallbackBuffers, size);
247            } else if (msgType == CAMERA_MSG_PREVIEW_FRAME && mManualBufferMode) {
248                obj = getCallbackBuffer(env, &mCallbackBuffers, size);
249
250                if (mCallbackBuffers.isEmpty()) {
251                    ALOGV("Out of buffers, clearing callback!");
252                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
253                    mManualCameraCallbackSet = false;
254
255                    if (obj == NULL) {
256                        return;
257                    }
258                }
259            } else {
260                ALOGV("Allocating callback buffer");
261                obj = env->NewByteArray(size);
262            }
263
264            if (obj == NULL) {
265                ALOGE("Couldn't allocate byte array for JPEG data");
266                env->ExceptionClear();
267            } else {
268                env->SetByteArrayRegion(obj, 0, size, data);
269            }
270        } else {
271            ALOGE("image heap is NULL");
272        }
273    }
274
275    // post image data to Java
276    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
277            mCameraJObjectWeak, msgType, 0, 0, obj);
278    if (obj) {
279        env->DeleteLocalRef(obj);
280    }
281}
282
283void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr,
284                                camera_frame_metadata_t *metadata)
285{
286    // VM pointer will be NULL if object is released
287    Mutex::Autolock _l(mLock);
288    JNIEnv *env = AndroidRuntime::getJNIEnv();
289    if (mCameraJObjectWeak == NULL) {
290        ALOGW("callback on dead camera object");
291        return;
292    }
293
294    int32_t dataMsgType = msgType & ~CAMERA_MSG_PREVIEW_METADATA;
295
296    // return data based on callback type
297    switch (dataMsgType) {
298        case CAMERA_MSG_VIDEO_FRAME:
299            // should never happen
300            break;
301
302        // For backward-compatibility purpose, if there is no callback
303        // buffer for raw image, the callback returns null.
304        case CAMERA_MSG_RAW_IMAGE:
305            ALOGV("rawCallback");
306            if (mRawImageCallbackBuffers.isEmpty()) {
307                env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
308                        mCameraJObjectWeak, dataMsgType, 0, 0, NULL);
309            } else {
310                copyAndPost(env, dataPtr, dataMsgType);
311            }
312            break;
313
314        // There is no data.
315        case 0:
316            break;
317
318        default:
319            ALOGV("dataCallback(%d, %p)", dataMsgType, dataPtr.get());
320            copyAndPost(env, dataPtr, dataMsgType);
321            break;
322    }
323
324    // post frame metadata to Java
325    if (metadata && (msgType & CAMERA_MSG_PREVIEW_METADATA)) {
326        postMetadata(env, CAMERA_MSG_PREVIEW_METADATA, metadata);
327    }
328}
329
330void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr)
331{
332    // TODO: plumb up to Java. For now, just drop the timestamp
333    postData(msgType, dataPtr, NULL);
334}
335
336void JNICameraContext::postMetadata(JNIEnv *env, int32_t msgType, camera_frame_metadata_t *metadata)
337{
338    jobjectArray obj = NULL;
339    obj = (jobjectArray) env->NewObjectArray(metadata->number_of_faces,
340                                             mFaceClass, NULL);
341    if (obj == NULL) {
342        ALOGE("Couldn't allocate face metadata array");
343        return;
344    }
345
346    for (int i = 0; i < metadata->number_of_faces; i++) {
347        jobject face = env->NewObject(mFaceClass, fields.face_constructor);
348        env->SetObjectArrayElement(obj, i, face);
349
350        jobject rect = env->NewObject(mRectClass, fields.rect_constructor);
351        env->SetIntField(rect, fields.rect_left, metadata->faces[i].rect[0]);
352        env->SetIntField(rect, fields.rect_top, metadata->faces[i].rect[1]);
353        env->SetIntField(rect, fields.rect_right, metadata->faces[i].rect[2]);
354        env->SetIntField(rect, fields.rect_bottom, metadata->faces[i].rect[3]);
355
356        env->SetObjectField(face, fields.face_rect, rect);
357        env->SetIntField(face, fields.face_score, metadata->faces[i].score);
358
359        env->DeleteLocalRef(face);
360        env->DeleteLocalRef(rect);
361    }
362    env->CallStaticVoidMethod(mCameraJClass, fields.post_event,
363            mCameraJObjectWeak, msgType, 0, 0, obj);
364    env->DeleteLocalRef(obj);
365}
366
367void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode)
368{
369    Mutex::Autolock _l(mLock);
370    mManualBufferMode = manualMode;
371    mManualCameraCallbackSet = false;
372
373    // In order to limit the over usage of binder threads, all non-manual buffer
374    // callbacks use CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now.
375    //
376    // Continuous callbacks will have the callback re-registered from handleMessage.
377    // Manual buffer mode will operate as fast as possible, relying on the finite supply
378    // of buffers for throttling.
379
380    if (!installed) {
381        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
382        clearCallbackBuffers_l(env, &mCallbackBuffers);
383    } else if (mManualBufferMode) {
384        if (!mCallbackBuffers.isEmpty()) {
385            mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
386            mManualCameraCallbackSet = true;
387        }
388    } else {
389        mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER);
390        clearCallbackBuffers_l(env, &mCallbackBuffers);
391    }
392}
393
394void JNICameraContext::addCallbackBuffer(
395        JNIEnv *env, jbyteArray cbb, int msgType)
396{
397    ALOGV("addCallbackBuffer: 0x%x", msgType);
398    if (cbb != NULL) {
399        Mutex::Autolock _l(mLock);
400        switch (msgType) {
401            case CAMERA_MSG_PREVIEW_FRAME: {
402                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
403                mCallbackBuffers.push(callbackBuffer);
404
405                ALOGV("Adding callback buffer to queue, %zu total",
406                        mCallbackBuffers.size());
407
408                // We want to make sure the camera knows we're ready for the
409                // next frame. This may have come unset had we not had a
410                // callbackbuffer ready for it last time.
411                if (mManualBufferMode && !mManualCameraCallbackSet) {
412                    mCamera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_CAMERA);
413                    mManualCameraCallbackSet = true;
414                }
415                break;
416            }
417            case CAMERA_MSG_RAW_IMAGE: {
418                jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb);
419                mRawImageCallbackBuffers.push(callbackBuffer);
420                break;
421            }
422            default: {
423                jniThrowException(env,
424                        "java/lang/IllegalArgumentException",
425                        "Unsupported message type");
426                return;
427            }
428        }
429    } else {
430       ALOGE("Null byte array!");
431    }
432}
433
434void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env)
435{
436    clearCallbackBuffers_l(env, &mCallbackBuffers);
437    clearCallbackBuffers_l(env, &mRawImageCallbackBuffers);
438}
439
440void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env, Vector<jbyteArray> *buffers) {
441    ALOGV("Clearing callback buffers, %zu remained", buffers->size());
442    while (!buffers->isEmpty()) {
443        env->DeleteGlobalRef(buffers->top());
444        buffers->pop();
445    }
446}
447
448static jint android_hardware_Camera_getNumberOfCameras(JNIEnv *env, jobject thiz)
449{
450    return Camera::getNumberOfCameras();
451}
452
453static void android_hardware_Camera_getCameraInfo(JNIEnv *env, jobject thiz,
454    jint cameraId, jobject info_obj)
455{
456    CameraInfo cameraInfo;
457    status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
458    if (rc != NO_ERROR) {
459        jniThrowRuntimeException(env, "Fail to get camera info");
460        return;
461    }
462    env->SetIntField(info_obj, fields.facing, cameraInfo.facing);
463    env->SetIntField(info_obj, fields.orientation, cameraInfo.orientation);
464
465    char value[PROPERTY_VALUE_MAX];
466    property_get("ro.camera.sound.forced", value, "0");
467    jboolean canDisableShutterSound = (strncmp(value, "0", 2) == 0);
468    env->SetBooleanField(info_obj, fields.canDisableShutterSound,
469            canDisableShutterSound);
470}
471
472// connect to camera service
473static jint android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz,
474    jobject weak_this, jint cameraId, jint halVersion, jstring clientPackageName)
475{
476    // Convert jstring to String16
477    const char16_t *rawClientName = reinterpret_cast<const char16_t*>(
478        env->GetStringChars(clientPackageName, NULL));
479    jsize rawClientNameLen = env->GetStringLength(clientPackageName);
480    String16 clientName(rawClientName, rawClientNameLen);
481    env->ReleaseStringChars(clientPackageName,
482                            reinterpret_cast<const jchar*>(rawClientName));
483
484    sp<Camera> camera;
485    if (halVersion == CAMERA_HAL_API_VERSION_NORMAL_CONNECT) {
486        // Default path: hal version is don't care, do normal camera connect.
487        camera = Camera::connect(cameraId, clientName,
488                Camera::USE_CALLING_UID);
489    } else {
490        jint status = Camera::connectLegacy(cameraId, halVersion, clientName,
491                Camera::USE_CALLING_UID, camera);
492        if (status != NO_ERROR) {
493            return status;
494        }
495    }
496
497    if (camera == NULL) {
498        return -EACCES;
499    }
500
501    // make sure camera hardware is alive
502    if (camera->getStatus() != NO_ERROR) {
503        return NO_INIT;
504    }
505
506    jclass clazz = env->GetObjectClass(thiz);
507    if (clazz == NULL) {
508        // This should never happen
509        jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
510        return INVALID_OPERATION;
511    }
512
513    // We use a weak reference so the Camera object can be garbage collected.
514    // The reference is only used as a proxy for callbacks.
515    sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
516    context->incStrong((void*)android_hardware_Camera_native_setup);
517    camera->setListener(context);
518
519    // save context in opaque field
520    env->SetLongField(thiz, fields.context, (jlong)context.get());
521    return NO_ERROR;
522}
523
524// disconnect from camera service
525// It's okay to call this when the native camera context is already null.
526// This handles the case where the user has called release() and the
527// finalizer is invoked later.
528static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
529{
530    ALOGV("release camera");
531    JNICameraContext* context = NULL;
532    sp<Camera> camera;
533    {
534        Mutex::Autolock _l(sLock);
535        context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
536
537        // Make sure we do not attempt to callback on a deleted Java object.
538        env->SetLongField(thiz, fields.context, 0);
539    }
540
541    // clean up if release has not been called before
542    if (context != NULL) {
543        camera = context->getCamera();
544        context->release();
545        ALOGV("native_release: context=%p camera=%p", context, camera.get());
546
547        // clear callbacks
548        if (camera != NULL) {
549            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
550            camera->disconnect();
551        }
552
553        // remove context to prevent further Java access
554        context->decStrong((void*)android_hardware_Camera_native_setup);
555    }
556}
557
558static void android_hardware_Camera_setPreviewSurface(JNIEnv *env, jobject thiz, jobject jSurface)
559{
560    ALOGV("setPreviewSurface");
561    sp<Camera> camera = get_native_camera(env, thiz, NULL);
562    if (camera == 0) return;
563
564    sp<IGraphicBufferProducer> gbp;
565    sp<Surface> surface;
566    if (jSurface) {
567        surface = android_view_Surface_getSurface(env, jSurface);
568        if (surface != NULL) {
569            gbp = surface->getIGraphicBufferProducer();
570        }
571    }
572
573    if (camera->setPreviewTarget(gbp) != NO_ERROR) {
574        jniThrowException(env, "java/io/IOException", "setPreviewTexture failed");
575    }
576}
577
578static void android_hardware_Camera_setPreviewTexture(JNIEnv *env,
579        jobject thiz, jobject jSurfaceTexture)
580{
581    ALOGV("setPreviewTexture");
582    sp<Camera> camera = get_native_camera(env, thiz, NULL);
583    if (camera == 0) return;
584
585    sp<IGraphicBufferProducer> producer = NULL;
586    if (jSurfaceTexture != NULL) {
587        producer = SurfaceTexture_getProducer(env, jSurfaceTexture);
588        if (producer == NULL) {
589            jniThrowException(env, "java/lang/IllegalArgumentException",
590                    "SurfaceTexture already released in setPreviewTexture");
591            return;
592        }
593
594    }
595
596    if (camera->setPreviewTarget(producer) != NO_ERROR) {
597        jniThrowException(env, "java/io/IOException",
598                "setPreviewTexture failed");
599    }
600}
601
602static void android_hardware_Camera_setPreviewCallbackSurface(JNIEnv *env,
603        jobject thiz, jobject jSurface)
604{
605    ALOGV("setPreviewCallbackSurface");
606    JNICameraContext* context;
607    sp<Camera> camera = get_native_camera(env, thiz, &context);
608    if (camera == 0) return;
609
610    sp<IGraphicBufferProducer> gbp;
611    sp<Surface> surface;
612    if (jSurface) {
613        surface = android_view_Surface_getSurface(env, jSurface);
614        if (surface != NULL) {
615            gbp = surface->getIGraphicBufferProducer();
616        }
617    }
618    // Clear out normal preview callbacks
619    context->setCallbackMode(env, false, false);
620    // Then set up callback surface
621    if (camera->setPreviewCallbackTarget(gbp) != NO_ERROR) {
622        jniThrowException(env, "java/io/IOException", "setPreviewCallbackTarget failed");
623    }
624}
625
626static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz)
627{
628    ALOGV("startPreview");
629    sp<Camera> camera = get_native_camera(env, thiz, NULL);
630    if (camera == 0) return;
631
632    if (camera->startPreview() != NO_ERROR) {
633        jniThrowRuntimeException(env, "startPreview failed");
634        return;
635    }
636}
637
638static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz)
639{
640    ALOGV("stopPreview");
641    sp<Camera> c = get_native_camera(env, thiz, NULL);
642    if (c == 0) return;
643
644    c->stopPreview();
645}
646
647static jboolean android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz)
648{
649    ALOGV("previewEnabled");
650    sp<Camera> c = get_native_camera(env, thiz, NULL);
651    if (c == 0) return JNI_FALSE;
652
653    return c->previewEnabled() ? JNI_TRUE : JNI_FALSE;
654}
655
656static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
657{
658    ALOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
659    // Important: Only install preview_callback if the Java code has called
660    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
661    // each preview frame for nothing.
662    JNICameraContext* context;
663    sp<Camera> camera = get_native_camera(env, thiz, &context);
664    if (camera == 0) return;
665
666    // setCallbackMode will take care of setting the context flags and calling
667    // camera->setPreviewCallbackFlags within a mutex for us.
668    context->setCallbackMode(env, installed, manualBuffer);
669}
670
671static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, jint msgType) {
672    ALOGV("addCallbackBuffer: 0x%x", msgType);
673
674    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetLongField(thiz, fields.context));
675
676    if (context != NULL) {
677        context->addCallbackBuffer(env, bytes, msgType);
678    }
679}
680
681static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz)
682{
683    ALOGV("autoFocus");
684    JNICameraContext* context;
685    sp<Camera> c = get_native_camera(env, thiz, &context);
686    if (c == 0) return;
687
688    if (c->autoFocus() != NO_ERROR) {
689        jniThrowRuntimeException(env, "autoFocus failed");
690    }
691}
692
693static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz)
694{
695    ALOGV("cancelAutoFocus");
696    JNICameraContext* context;
697    sp<Camera> c = get_native_camera(env, thiz, &context);
698    if (c == 0) return;
699
700    if (c->cancelAutoFocus() != NO_ERROR) {
701        jniThrowRuntimeException(env, "cancelAutoFocus failed");
702    }
703}
704
705static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, jint msgType)
706{
707    ALOGV("takePicture");
708    JNICameraContext* context;
709    sp<Camera> camera = get_native_camera(env, thiz, &context);
710    if (camera == 0) return;
711
712    /*
713     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
714     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
715     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
716     * is enabled to receive the callback notification but no data.
717     *
718     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
719     * Java application.
720     */
721    if (msgType & CAMERA_MSG_RAW_IMAGE) {
722        ALOGV("Enable raw image callback buffer");
723        if (!context->isRawImageCallbackBufferAvailable()) {
724            ALOGV("Enable raw image notification, since no callback buffer exists");
725            msgType &= ~CAMERA_MSG_RAW_IMAGE;
726            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
727        }
728    }
729
730    if (camera->takePicture(msgType) != NO_ERROR) {
731        jniThrowRuntimeException(env, "takePicture failed");
732        return;
733    }
734}
735
736static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params)
737{
738    ALOGV("setParameters");
739    sp<Camera> camera = get_native_camera(env, thiz, NULL);
740    if (camera == 0) return;
741
742    const jchar* str = env->GetStringCritical(params, 0);
743    String8 params8;
744    if (params) {
745        params8 = String8(reinterpret_cast<const char16_t*>(str),
746                          env->GetStringLength(params));
747        env->ReleaseStringCritical(params, str);
748    }
749    if (camera->setParameters(params8) != NO_ERROR) {
750        jniThrowRuntimeException(env, "setParameters failed");
751        return;
752    }
753}
754
755static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz)
756{
757    ALOGV("getParameters");
758    sp<Camera> camera = get_native_camera(env, thiz, NULL);
759    if (camera == 0) return 0;
760
761    String8 params8 = camera->getParameters();
762    if (params8.isEmpty()) {
763        jniThrowRuntimeException(env, "getParameters failed (empty parameters)");
764        return 0;
765    }
766    return env->NewStringUTF(params8.string());
767}
768
769static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz)
770{
771    ALOGV("reconnect");
772    sp<Camera> camera = get_native_camera(env, thiz, NULL);
773    if (camera == 0) return;
774
775    if (camera->reconnect() != NO_ERROR) {
776        jniThrowException(env, "java/io/IOException", "reconnect failed");
777        return;
778    }
779}
780
781static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz)
782{
783    ALOGV("lock");
784    sp<Camera> camera = get_native_camera(env, thiz, NULL);
785    if (camera == 0) return;
786
787    if (camera->lock() != NO_ERROR) {
788        jniThrowRuntimeException(env, "lock failed");
789    }
790}
791
792static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz)
793{
794    ALOGV("unlock");
795    sp<Camera> camera = get_native_camera(env, thiz, NULL);
796    if (camera == 0) return;
797
798    if (camera->unlock() != NO_ERROR) {
799        jniThrowRuntimeException(env, "unlock failed");
800    }
801}
802
803static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value)
804{
805    ALOGV("startSmoothZoom");
806    sp<Camera> camera = get_native_camera(env, thiz, NULL);
807    if (camera == 0) return;
808
809    status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0);
810    if (rc == BAD_VALUE) {
811        char msg[64];
812        sprintf(msg, "invalid zoom value=%d", value);
813        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
814    } else if (rc != NO_ERROR) {
815        jniThrowRuntimeException(env, "start smooth zoom failed");
816    }
817}
818
819static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz)
820{
821    ALOGV("stopSmoothZoom");
822    sp<Camera> camera = get_native_camera(env, thiz, NULL);
823    if (camera == 0) return;
824
825    if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) {
826        jniThrowRuntimeException(env, "stop smooth zoom failed");
827    }
828}
829
830static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz,
831        jint value)
832{
833    ALOGV("setDisplayOrientation");
834    sp<Camera> camera = get_native_camera(env, thiz, NULL);
835    if (camera == 0) return;
836
837    if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) {
838        jniThrowRuntimeException(env, "set display orientation failed");
839    }
840}
841
842static jboolean android_hardware_Camera_enableShutterSound(JNIEnv *env, jobject thiz,
843        jboolean enabled)
844{
845    ALOGV("enableShutterSound");
846    sp<Camera> camera = get_native_camera(env, thiz, NULL);
847    if (camera == 0) return JNI_FALSE;
848
849    int32_t value = (enabled == JNI_TRUE) ? 1 : 0;
850    status_t rc = camera->sendCommand(CAMERA_CMD_ENABLE_SHUTTER_SOUND, value, 0);
851    if (rc == NO_ERROR) {
852        return JNI_TRUE;
853    } else if (rc == PERMISSION_DENIED) {
854        return JNI_FALSE;
855    } else {
856        jniThrowRuntimeException(env, "enable shutter sound failed");
857        return JNI_FALSE;
858    }
859}
860
861static void android_hardware_Camera_startFaceDetection(JNIEnv *env, jobject thiz,
862        jint type)
863{
864    ALOGV("startFaceDetection");
865    JNICameraContext* context;
866    sp<Camera> camera = get_native_camera(env, thiz, &context);
867    if (camera == 0) return;
868
869    status_t rc = camera->sendCommand(CAMERA_CMD_START_FACE_DETECTION, type, 0);
870    if (rc == BAD_VALUE) {
871        char msg[64];
872        snprintf(msg, sizeof(msg), "invalid face detection type=%d", type);
873        jniThrowException(env, "java/lang/IllegalArgumentException", msg);
874    } else if (rc != NO_ERROR) {
875        jniThrowRuntimeException(env, "start face detection failed");
876    }
877}
878
879static void android_hardware_Camera_stopFaceDetection(JNIEnv *env, jobject thiz)
880{
881    ALOGV("stopFaceDetection");
882    sp<Camera> camera = get_native_camera(env, thiz, NULL);
883    if (camera == 0) return;
884
885    if (camera->sendCommand(CAMERA_CMD_STOP_FACE_DETECTION, 0, 0) != NO_ERROR) {
886        jniThrowRuntimeException(env, "stop face detection failed");
887    }
888}
889
890static void android_hardware_Camera_enableFocusMoveCallback(JNIEnv *env, jobject thiz, jint enable)
891{
892    ALOGV("enableFocusMoveCallback");
893    sp<Camera> camera = get_native_camera(env, thiz, NULL);
894    if (camera == 0) return;
895
896    if (camera->sendCommand(CAMERA_CMD_ENABLE_FOCUS_MOVE_MSG, enable, 0) != NO_ERROR) {
897        jniThrowRuntimeException(env, "enable focus move callback failed");
898    }
899}
900
901//-------------------------------------------------
902
903static JNINativeMethod camMethods[] = {
904  { "getNumberOfCameras",
905    "()I",
906    (void *)android_hardware_Camera_getNumberOfCameras },
907  { "_getCameraInfo",
908    "(ILandroid/hardware/Camera$CameraInfo;)V",
909    (void*)android_hardware_Camera_getCameraInfo },
910  { "native_setup",
911    "(Ljava/lang/Object;IILjava/lang/String;)I",
912    (void*)android_hardware_Camera_native_setup },
913  { "native_release",
914    "()V",
915    (void*)android_hardware_Camera_release },
916  { "setPreviewSurface",
917    "(Landroid/view/Surface;)V",
918    (void *)android_hardware_Camera_setPreviewSurface },
919  { "setPreviewTexture",
920    "(Landroid/graphics/SurfaceTexture;)V",
921    (void *)android_hardware_Camera_setPreviewTexture },
922  { "setPreviewCallbackSurface",
923    "(Landroid/view/Surface;)V",
924    (void *)android_hardware_Camera_setPreviewCallbackSurface },
925  { "startPreview",
926    "()V",
927    (void *)android_hardware_Camera_startPreview },
928  { "_stopPreview",
929    "()V",
930    (void *)android_hardware_Camera_stopPreview },
931  { "previewEnabled",
932    "()Z",
933    (void *)android_hardware_Camera_previewEnabled },
934  { "setHasPreviewCallback",
935    "(ZZ)V",
936    (void *)android_hardware_Camera_setHasPreviewCallback },
937  { "_addCallbackBuffer",
938    "([BI)V",
939    (void *)android_hardware_Camera_addCallbackBuffer },
940  { "native_autoFocus",
941    "()V",
942    (void *)android_hardware_Camera_autoFocus },
943  { "native_cancelAutoFocus",
944    "()V",
945    (void *)android_hardware_Camera_cancelAutoFocus },
946  { "native_takePicture",
947    "(I)V",
948    (void *)android_hardware_Camera_takePicture },
949  { "native_setParameters",
950    "(Ljava/lang/String;)V",
951    (void *)android_hardware_Camera_setParameters },
952  { "native_getParameters",
953    "()Ljava/lang/String;",
954    (void *)android_hardware_Camera_getParameters },
955  { "reconnect",
956    "()V",
957    (void*)android_hardware_Camera_reconnect },
958  { "lock",
959    "()V",
960    (void*)android_hardware_Camera_lock },
961  { "unlock",
962    "()V",
963    (void*)android_hardware_Camera_unlock },
964  { "startSmoothZoom",
965    "(I)V",
966    (void *)android_hardware_Camera_startSmoothZoom },
967  { "stopSmoothZoom",
968    "()V",
969    (void *)android_hardware_Camera_stopSmoothZoom },
970  { "setDisplayOrientation",
971    "(I)V",
972    (void *)android_hardware_Camera_setDisplayOrientation },
973  { "_enableShutterSound",
974    "(Z)Z",
975    (void *)android_hardware_Camera_enableShutterSound },
976  { "_startFaceDetection",
977    "(I)V",
978    (void *)android_hardware_Camera_startFaceDetection },
979  { "_stopFaceDetection",
980    "()V",
981    (void *)android_hardware_Camera_stopFaceDetection},
982  { "enableFocusMoveCallback",
983    "(I)V",
984    (void *)android_hardware_Camera_enableFocusMoveCallback},
985};
986
987struct field {
988    const char *class_name;
989    const char *field_name;
990    const char *field_type;
991    jfieldID   *jfield;
992};
993
994static void find_fields(JNIEnv *env, field *fields, int count)
995{
996    for (int i = 0; i < count; i++) {
997        field *f = &fields[i];
998        jclass clazz = FindClassOrDie(env, f->class_name);
999        jfieldID field = GetFieldIDOrDie(env, clazz, f->field_name, f->field_type);
1000        *(f->jfield) = field;
1001    }
1002}
1003
1004// Get all the required offsets in java class and register native functions
1005int register_android_hardware_Camera(JNIEnv *env)
1006{
1007    field fields_to_find[] = {
1008        { "android/hardware/Camera", "mNativeContext",   "J", &fields.context },
1009        { "android/hardware/Camera$CameraInfo", "facing",   "I", &fields.facing },
1010        { "android/hardware/Camera$CameraInfo", "orientation",   "I", &fields.orientation },
1011        { "android/hardware/Camera$CameraInfo", "canDisableShutterSound",   "Z",
1012          &fields.canDisableShutterSound },
1013        { "android/hardware/Camera$Face", "rect", "Landroid/graphics/Rect;", &fields.face_rect },
1014        { "android/hardware/Camera$Face", "score", "I", &fields.face_score },
1015        { "android/graphics/Rect", "left", "I", &fields.rect_left },
1016        { "android/graphics/Rect", "top", "I", &fields.rect_top },
1017        { "android/graphics/Rect", "right", "I", &fields.rect_right },
1018        { "android/graphics/Rect", "bottom", "I", &fields.rect_bottom },
1019    };
1020
1021    find_fields(env, fields_to_find, NELEM(fields_to_find));
1022
1023    jclass clazz = FindClassOrDie(env, "android/hardware/Camera");
1024    fields.post_event = GetStaticMethodIDOrDie(env, clazz, "postEventFromNative",
1025                                               "(Ljava/lang/Object;IIILjava/lang/Object;)V");
1026
1027    clazz = FindClassOrDie(env, "android/graphics/Rect");
1028    fields.rect_constructor = GetMethodIDOrDie(env, clazz, "<init>", "()V");
1029
1030    clazz = FindClassOrDie(env, "android/hardware/Camera$Face");
1031    fields.face_constructor = GetMethodIDOrDie(env, clazz, "<init>", "()V");
1032
1033    // Register native functions
1034    return RegisterMethodsOrDie(env, "android/hardware/Camera", camMethods, NELEM(camMethods));
1035}
1036