| /* |
| ** |
| ** Copyright 2008, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| //#define LOG_NDEBUG 0 |
| #define LOG_TAG "Camera-JNI" |
| #include <utils/Log.h> |
| |
| #include "jni.h" |
| #include "JNIHelp.h" |
| #include "android_runtime/AndroidRuntime.h" |
| |
| #include <ui/Surface.h> |
| #include <ui/Camera.h> |
| #include <binder/IMemory.h> |
| |
| using namespace android; |
| |
| struct fields_t { |
| jfieldID context; |
| jfieldID surface; |
| jmethodID post_event; |
| }; |
| |
| static fields_t fields; |
| static Mutex sLock; |
| |
| // provides persistent context for calls from native code to Java |
| class JNICameraContext: public CameraListener |
| { |
| public: |
| JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera); |
| ~JNICameraContext() { release(); } |
| virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2); |
| virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr); |
| virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); |
| sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; } |
| void release(); |
| |
| private: |
| void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType); |
| |
| jobject mCameraJObjectWeak; // weak reference to java object |
| jclass mCameraJClass; // strong reference to java class |
| sp<Camera> mCamera; // strong reference to native object |
| Mutex mLock; |
| }; |
| |
| sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext) |
| { |
| sp<Camera> camera; |
| Mutex::Autolock _l(sLock); |
| JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context)); |
| if (context != NULL) { |
| camera = context->getCamera(); |
| } |
| LOGV("get_native_camera: context=%p, camera=%p", context, camera.get()); |
| if (camera == 0) { |
| jniThrowException(env, "java/lang/RuntimeException", "Method called after release()"); |
| } |
| |
| if (pContext != NULL) *pContext = context; |
| return camera; |
| } |
| |
| JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera) |
| { |
| mCameraJObjectWeak = env->NewGlobalRef(weak_this); |
| mCameraJClass = (jclass)env->NewGlobalRef(clazz); |
| mCamera = camera; |
| } |
| |
| void JNICameraContext::release() |
| { |
| LOGV("release"); |
| Mutex::Autolock _l(mLock); |
| JNIEnv *env = AndroidRuntime::getJNIEnv(); |
| |
| if (mCameraJObjectWeak != NULL) { |
| env->DeleteGlobalRef(mCameraJObjectWeak); |
| mCameraJObjectWeak = NULL; |
| } |
| if (mCameraJClass != NULL) { |
| env->DeleteGlobalRef(mCameraJClass); |
| mCameraJClass = NULL; |
| } |
| mCamera.clear(); |
| } |
| |
| void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2) |
| { |
| LOGV("notify"); |
| |
| // VM pointer will be NULL if object is released |
| Mutex::Autolock _l(mLock); |
| if (mCameraJObjectWeak == NULL) { |
| LOGW("callback on dead camera object"); |
| return; |
| } |
| JNIEnv *env = AndroidRuntime::getJNIEnv(); |
| env->CallStaticVoidMethod(mCameraJClass, fields.post_event, |
| mCameraJObjectWeak, msgType, ext1, ext2); |
| } |
| |
| void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType) |
| { |
| jbyteArray obj = NULL; |
| |
| // allocate Java byte array and copy data |
| if (dataPtr != NULL) { |
| ssize_t offset; |
| size_t size; |
| sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size); |
| LOGV("postData: off=%d, size=%d", offset, size); |
| uint8_t *heapBase = (uint8_t*)heap->base(); |
| |
| if (heapBase != NULL) { |
| const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset); |
| obj = env->NewByteArray(size); |
| if (obj == NULL) { |
| LOGE("Couldn't allocate byte array for JPEG data"); |
| env->ExceptionClear(); |
| } else { |
| env->SetByteArrayRegion(obj, 0, size, data); |
| } |
| } else { |
| LOGE("image heap is NULL"); |
| } |
| } |
| |
| // post image data to Java |
| env->CallStaticVoidMethod(mCameraJClass, fields.post_event, |
| mCameraJObjectWeak, msgType, 0, 0, obj); |
| if (obj) { |
| env->DeleteLocalRef(obj); |
| } |
| } |
| |
| void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr) |
| { |
| // VM pointer will be NULL if object is released |
| Mutex::Autolock _l(mLock); |
| JNIEnv *env = AndroidRuntime::getJNIEnv(); |
| if (mCameraJObjectWeak == NULL) { |
| LOGW("callback on dead camera object"); |
| return; |
| } |
| |
| // return data based on callback type |
| switch(msgType) { |
| case CAMERA_MSG_VIDEO_FRAME: |
| // should never happen |
| break; |
| // don't return raw data to Java |
| case CAMERA_MSG_RAW_IMAGE: |
| LOGV("rawCallback"); |
| env->CallStaticVoidMethod(mCameraJClass, fields.post_event, |
| mCameraJObjectWeak, msgType, 0, 0, NULL); |
| break; |
| default: |
| // TODO: Change to LOGV |
| LOGD("dataCallback(%d, %p)", msgType, dataPtr.get()); |
| copyAndPost(env, dataPtr, msgType); |
| break; |
| } |
| } |
| |
| void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) |
| { |
| // TODO: plumb up to Java. For now, just drop the timestamp |
| postData(msgType, dataPtr); |
| } |
| |
| // connect to camera service |
| static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz, jobject weak_this) |
| { |
| sp<Camera> camera = Camera::connect(); |
| |
| if (camera == NULL) { |
| jniThrowException(env, "java/lang/RuntimeException", |
| "Fail to connect to camera service"); |
| return; |
| } |
| |
| // make sure camera hardware is alive |
| if (camera->getStatus() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "Camera initialization failed"); |
| return; |
| } |
| |
| jclass clazz = env->GetObjectClass(thiz); |
| if (clazz == NULL) { |
| jniThrowException(env, "java/lang/RuntimeException", "Can't find android/hardware/Camera"); |
| return; |
| } |
| |
| // We use a weak reference so the Camera object can be garbage collected. |
| // The reference is only used as a proxy for callbacks. |
| sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera); |
| context->incStrong(thiz); |
| camera->setListener(context); |
| |
| // save context in opaque field |
| env->SetIntField(thiz, fields.context, (int)context.get()); |
| } |
| |
| // disconnect from camera service |
| // It's okay to call this when the native camera context is already null. |
| // This handles the case where the user has called release() and the |
| // finalizer is invoked later. |
| static void android_hardware_Camera_release(JNIEnv *env, jobject thiz) |
| { |
| // TODO: Change to LOGV |
| LOGD("release camera"); |
| JNICameraContext* context = NULL; |
| sp<Camera> camera; |
| { |
| Mutex::Autolock _l(sLock); |
| context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context)); |
| |
| // Make sure we do not attempt to callback on a deleted Java object. |
| env->SetIntField(thiz, fields.context, 0); |
| } |
| |
| // clean up if release has not been called before |
| if (context != NULL) { |
| camera = context->getCamera(); |
| context->release(); |
| LOGV("native_release: context=%p camera=%p", context, camera.get()); |
| |
| // clear callbacks |
| if (camera != NULL) { |
| camera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP); |
| camera->disconnect(); |
| } |
| |
| // remove context to prevent further Java access |
| context->decStrong(thiz); |
| } |
| } |
| |
| static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface) |
| { |
| LOGV("setPreviewDisplay"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return; |
| |
| sp<Surface> surface = NULL; |
| if (jSurface != NULL) { |
| surface = reinterpret_cast<Surface*>(env->GetIntField(jSurface, fields.surface)); |
| } |
| if (camera->setPreviewDisplay(surface) != NO_ERROR) { |
| jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed"); |
| } |
| } |
| |
| static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz) |
| { |
| LOGV("startPreview"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return; |
| |
| if (camera->startPreview() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "startPreview failed"); |
| return; |
| } |
| } |
| |
| static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz) |
| { |
| LOGV("stopPreview"); |
| sp<Camera> c = get_native_camera(env, thiz, NULL); |
| if (c == 0) return; |
| |
| c->stopPreview(); |
| } |
| |
| static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz) |
| { |
| LOGV("previewEnabled"); |
| sp<Camera> c = get_native_camera(env, thiz, NULL); |
| if (c == 0) return false; |
| |
| return c->previewEnabled(); |
| } |
| |
| static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean oneshot) |
| { |
| // Important: Only install preview_callback if the Java code has called |
| // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy |
| // each preview frame for nothing. |
| JNICameraContext* context; |
| sp<Camera> camera = get_native_camera(env, thiz, &context); |
| if (camera == 0) return; |
| |
| int callback_flag; |
| if (installed) { |
| callback_flag = oneshot ? FRAME_CALLBACK_FLAG_BARCODE_SCANNER : FRAME_CALLBACK_FLAG_CAMERA; |
| } else { |
| callback_flag = FRAME_CALLBACK_FLAG_NOOP; |
| } |
| camera->setPreviewCallbackFlags(callback_flag); |
| } |
| |
| static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz) |
| { |
| LOGV("autoFocus"); |
| JNICameraContext* context; |
| sp<Camera> c = get_native_camera(env, thiz, &context); |
| if (c == 0) return; |
| |
| if (c->autoFocus() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "autoFocus failed"); |
| } |
| } |
| |
| static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz) |
| { |
| LOGV("cancelAutoFocus"); |
| JNICameraContext* context; |
| sp<Camera> c = get_native_camera(env, thiz, &context); |
| if (c == 0) return; |
| |
| if (c->cancelAutoFocus() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "cancelAutoFocus failed"); |
| } |
| } |
| |
| static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz) |
| { |
| LOGV("takePicture"); |
| JNICameraContext* context; |
| sp<Camera> camera = get_native_camera(env, thiz, &context); |
| if (camera == 0) return; |
| |
| if (camera->takePicture() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "takePicture failed"); |
| return; |
| } |
| } |
| |
| static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params) |
| { |
| LOGV("setParameters"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return; |
| |
| const jchar* str = env->GetStringCritical(params, 0); |
| String8 params8; |
| if (params) { |
| params8 = String8(str, env->GetStringLength(params)); |
| env->ReleaseStringCritical(params, str); |
| } |
| if (camera->setParameters(params8) != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "setParameters failed"); |
| return; |
| } |
| } |
| |
| static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz) |
| { |
| LOGV("getParameters"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return 0; |
| |
| return env->NewStringUTF(camera->getParameters().string()); |
| } |
| |
| static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz) |
| { |
| LOGV("reconnect"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return; |
| |
| if (camera->reconnect() != NO_ERROR) { |
| jniThrowException(env, "java/io/IOException", "reconnect failed"); |
| return; |
| } |
| } |
| |
| static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz) |
| { |
| LOGV("lock"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return; |
| |
| if (camera->lock() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "lock failed"); |
| } |
| } |
| |
| static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz) |
| { |
| LOGV("unlock"); |
| sp<Camera> camera = get_native_camera(env, thiz, NULL); |
| if (camera == 0) return; |
| |
| if (camera->unlock() != NO_ERROR) { |
| jniThrowException(env, "java/lang/RuntimeException", "unlock failed"); |
| } |
| } |
| |
| //------------------------------------------------- |
| |
| static JNINativeMethod camMethods[] = { |
| { "native_setup", |
| "(Ljava/lang/Object;)V", |
| (void*)android_hardware_Camera_native_setup }, |
| { "native_release", |
| "()V", |
| (void*)android_hardware_Camera_release }, |
| { "setPreviewDisplay", |
| "(Landroid/view/Surface;)V", |
| (void *)android_hardware_Camera_setPreviewDisplay }, |
| { "startPreview", |
| "()V", |
| (void *)android_hardware_Camera_startPreview }, |
| { "stopPreview", |
| "()V", |
| (void *)android_hardware_Camera_stopPreview }, |
| { "previewEnabled", |
| "()Z", |
| (void *)android_hardware_Camera_previewEnabled }, |
| { "setHasPreviewCallback", |
| "(ZZ)V", |
| (void *)android_hardware_Camera_setHasPreviewCallback }, |
| { "native_autoFocus", |
| "()V", |
| (void *)android_hardware_Camera_autoFocus }, |
| { "native_cancelAutoFocus", |
| "()V", |
| (void *)android_hardware_Camera_cancelAutoFocus }, |
| { "native_takePicture", |
| "()V", |
| (void *)android_hardware_Camera_takePicture }, |
| { "native_setParameters", |
| "(Ljava/lang/String;)V", |
| (void *)android_hardware_Camera_setParameters }, |
| { "native_getParameters", |
| "()Ljava/lang/String;", |
| (void *)android_hardware_Camera_getParameters }, |
| { "reconnect", |
| "()V", |
| (void*)android_hardware_Camera_reconnect }, |
| { "lock", |
| "()V", |
| (void*)android_hardware_Camera_lock }, |
| { "unlock", |
| "()V", |
| (void*)android_hardware_Camera_unlock }, |
| }; |
| |
| struct field { |
| const char *class_name; |
| const char *field_name; |
| const char *field_type; |
| jfieldID *jfield; |
| }; |
| |
| static int find_fields(JNIEnv *env, field *fields, int count) |
| { |
| for (int i = 0; i < count; i++) { |
| field *f = &fields[i]; |
| jclass clazz = env->FindClass(f->class_name); |
| if (clazz == NULL) { |
| LOGE("Can't find %s", f->class_name); |
| return -1; |
| } |
| |
| jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type); |
| if (field == NULL) { |
| LOGE("Can't find %s.%s", f->class_name, f->field_name); |
| return -1; |
| } |
| |
| *(f->jfield) = field; |
| } |
| |
| return 0; |
| } |
| |
| // Get all the required offsets in java class and register native functions |
| int register_android_hardware_Camera(JNIEnv *env) |
| { |
| field fields_to_find[] = { |
| { "android/hardware/Camera", "mNativeContext", "I", &fields.context }, |
| { "android/view/Surface", "mSurface", "I", &fields.surface } |
| }; |
| |
| if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0) |
| return -1; |
| |
| jclass clazz = env->FindClass("android/hardware/Camera"); |
| fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative", |
| "(Ljava/lang/Object;IIILjava/lang/Object;)V"); |
| if (fields.post_event == NULL) { |
| LOGE("Can't find android/hardware/Camera.postEventFromNative"); |
| return -1; |
| } |
| |
| |
| // Register native functions |
| return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera", |
| camMethods, NELEM(camMethods)); |
| } |
| |