1 /* 2 ** 3 ** Copyright 2008, The Android Open Source Project 4 ** 5 ** Licensed under the Apache License, Version 2.0 (the "License"); 6 ** you may not use this file except in compliance with the License. 7 ** You may obtain a copy of the License at 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 11 ** Unless required by applicable law or agreed to in writing, software 12 ** distributed under the License is distributed on an "AS IS" BASIS, 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 ** See the License for the specific language governing permissions and 15 ** limitations under the License. 16 */ 17 18 //#define LOG_NDEBUG 0 19 #define LOG_TAG "Camera-JNI" 20 #include <utils/Log.h> 21 22 #include "jni.h" 23 #include "JNIHelp.h" 24 #include "android_runtime/AndroidRuntime.h" 25 26 #include <utils/Vector.h> 27 28 #include <surfaceflinger/Surface.h> 29 #include <camera/Camera.h> 30 #include <binder/IMemory.h> 31 32 using namespace android; 33 34 struct fields_t { 35 jfieldID context; 36 jfieldID surface; 37 jmethodID post_event; 38 }; 39 40 static fields_t fields; 41 static Mutex sLock; 42 43 // provides persistent context for calls from native code to Java 44 class JNICameraContext: public CameraListener 45 { 46 public: 47 JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera); 48 ~JNICameraContext() { release(); } 49 virtual void notify(int32_t msgType, int32_t ext1, int32_t ext2); 50 virtual void postData(int32_t msgType, const sp<IMemory>& dataPtr); 51 virtual void postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr); 52 void addCallbackBuffer(JNIEnv *env, jbyteArray cbb); 53 void setCallbackMode(JNIEnv *env, bool installed, bool manualMode); 54 sp<Camera> getCamera() { Mutex::Autolock _l(mLock); return mCamera; } 55 void release(); 56 57 private: 58 void copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType); 59 void clearCallbackBuffers_l(JNIEnv *env); 60 61 jobject mCameraJObjectWeak; // weak reference to java object 62 jclass mCameraJClass; // strong reference to java class 63 sp<Camera> mCamera; // strong reference to native object 64 Mutex mLock; 65 66 Vector<jbyteArray> mCallbackBuffers; // Global reference application managed byte[] 67 bool mManualBufferMode; // Whether to use application managed buffers. 68 bool mManualCameraCallbackSet; // Whether the callback has been set, used to reduce unnecessary calls to set the callback. 69 }; 70 71 sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext) 72 { 73 sp<Camera> camera; 74 Mutex::Autolock _l(sLock); 75 JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context)); 76 if (context != NULL) { 77 camera = context->getCamera(); 78 } 79 LOGV("get_native_camera: context=%p, camera=%p", context, camera.get()); 80 if (camera == 0) { 81 jniThrowException(env, "java/lang/RuntimeException", "Method called after release()"); 82 } 83 84 if (pContext != NULL) *pContext = context; 85 return camera; 86 } 87 88 JNICameraContext::JNICameraContext(JNIEnv* env, jobject weak_this, jclass clazz, const sp<Camera>& camera) 89 { 90 mCameraJObjectWeak = env->NewGlobalRef(weak_this); 91 mCameraJClass = (jclass)env->NewGlobalRef(clazz); 92 mCamera = camera; 93 94 mManualBufferMode = false; 95 mManualCameraCallbackSet = false; 96 } 97 98 void JNICameraContext::release() 99 { 100 LOGV("release"); 101 Mutex::Autolock _l(mLock); 102 JNIEnv *env = AndroidRuntime::getJNIEnv(); 103 104 if (mCameraJObjectWeak != NULL) { 105 env->DeleteGlobalRef(mCameraJObjectWeak); 106 mCameraJObjectWeak = NULL; 107 } 108 if (mCameraJClass != NULL) { 109 env->DeleteGlobalRef(mCameraJClass); 110 mCameraJClass = NULL; 111 } 112 clearCallbackBuffers_l(env); 113 mCamera.clear(); 114 } 115 116 void JNICameraContext::notify(int32_t msgType, int32_t ext1, int32_t ext2) 117 { 118 LOGV("notify"); 119 120 // VM pointer will be NULL if object is released 121 Mutex::Autolock _l(mLock); 122 if (mCameraJObjectWeak == NULL) { 123 LOGW("callback on dead camera object"); 124 return; 125 } 126 JNIEnv *env = AndroidRuntime::getJNIEnv(); 127 env->CallStaticVoidMethod(mCameraJClass, fields.post_event, 128 mCameraJObjectWeak, msgType, ext1, ext2, NULL); 129 } 130 131 void JNICameraContext::copyAndPost(JNIEnv* env, const sp<IMemory>& dataPtr, int msgType) 132 { 133 jbyteArray obj = NULL; 134 135 // allocate Java byte array and copy data 136 if (dataPtr != NULL) { 137 ssize_t offset; 138 size_t size; 139 sp<IMemoryHeap> heap = dataPtr->getMemory(&offset, &size); 140 LOGV("postData: off=%d, size=%d", offset, size); 141 uint8_t *heapBase = (uint8_t*)heap->base(); 142 143 if (heapBase != NULL) { 144 const jbyte* data = reinterpret_cast<const jbyte*>(heapBase + offset); 145 146 if (!mManualBufferMode) { 147 LOGV("Allocating callback buffer"); 148 obj = env->NewByteArray(size); 149 } else { 150 // Vector access should be protected by lock in postData() 151 if(!mCallbackBuffers.isEmpty()) { 152 LOGV("Using callback buffer from queue of length %d", mCallbackBuffers.size()); 153 jbyteArray globalBuffer = mCallbackBuffers.itemAt(0); 154 mCallbackBuffers.removeAt(0); 155 156 obj = (jbyteArray)env->NewLocalRef(globalBuffer); 157 env->DeleteGlobalRef(globalBuffer); 158 159 if (obj != NULL) { 160 jsize bufferLength = env->GetArrayLength(obj); 161 if ((int)bufferLength < (int)size) { 162 LOGE("Manually set buffer was too small! Expected %d bytes, but got %d!", 163 size, bufferLength); 164 env->DeleteLocalRef(obj); 165 return; 166 } 167 } 168 } 169 170 if(mCallbackBuffers.isEmpty()) { 171 LOGV("Out of buffers, clearing callback!"); 172 mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP); 173 mManualCameraCallbackSet = false; 174 175 if (obj == NULL) { 176 return; 177 } 178 } 179 } 180 181 if (obj == NULL) { 182 LOGE("Couldn't allocate byte array for JPEG data"); 183 env->ExceptionClear(); 184 } else { 185 env->SetByteArrayRegion(obj, 0, size, data); 186 } 187 } else { 188 LOGE("image heap is NULL"); 189 } 190 } 191 192 // post image data to Java 193 env->CallStaticVoidMethod(mCameraJClass, fields.post_event, 194 mCameraJObjectWeak, msgType, 0, 0, obj); 195 if (obj) { 196 env->DeleteLocalRef(obj); 197 } 198 } 199 200 void JNICameraContext::postData(int32_t msgType, const sp<IMemory>& dataPtr) 201 { 202 // VM pointer will be NULL if object is released 203 Mutex::Autolock _l(mLock); 204 JNIEnv *env = AndroidRuntime::getJNIEnv(); 205 if (mCameraJObjectWeak == NULL) { 206 LOGW("callback on dead camera object"); 207 return; 208 } 209 210 // return data based on callback type 211 switch(msgType) { 212 case CAMERA_MSG_VIDEO_FRAME: 213 // should never happen 214 break; 215 // don't return raw data to Java 216 case CAMERA_MSG_RAW_IMAGE: 217 LOGV("rawCallback"); 218 env->CallStaticVoidMethod(mCameraJClass, fields.post_event, 219 mCameraJObjectWeak, msgType, 0, 0, NULL); 220 break; 221 default: 222 // TODO: Change to LOGV 223 LOGV("dataCallback(%d, %p)", msgType, dataPtr.get()); 224 copyAndPost(env, dataPtr, msgType); 225 break; 226 } 227 } 228 229 void JNICameraContext::postDataTimestamp(nsecs_t timestamp, int32_t msgType, const sp<IMemory>& dataPtr) 230 { 231 // TODO: plumb up to Java. For now, just drop the timestamp 232 postData(msgType, dataPtr); 233 } 234 235 void JNICameraContext::setCallbackMode(JNIEnv *env, bool installed, bool manualMode) 236 { 237 Mutex::Autolock _l(mLock); 238 mManualBufferMode = manualMode; 239 mManualCameraCallbackSet = false; 240 241 // In order to limit the over usage of binder threads, all non-manual buffer 242 // callbacks use FRAME_CALLBACK_FLAG_BARCODE_SCANNER mode now. 243 // 244 // Continuous callbacks will have the callback re-registered from handleMessage. 245 // Manual buffer mode will operate as fast as possible, relying on the finite supply 246 // of buffers for throttling. 247 248 if (!installed) { 249 mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP); 250 clearCallbackBuffers_l(env); 251 } else if (mManualBufferMode) { 252 if (!mCallbackBuffers.isEmpty()) { 253 mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_CAMERA); 254 mManualCameraCallbackSet = true; 255 } 256 } else { 257 mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_BARCODE_SCANNER); 258 clearCallbackBuffers_l(env); 259 } 260 } 261 262 void JNICameraContext::addCallbackBuffer(JNIEnv *env, jbyteArray cbb) 263 { 264 if (cbb != NULL) { 265 Mutex::Autolock _l(mLock); 266 jbyteArray callbackBuffer = (jbyteArray)env->NewGlobalRef(cbb); 267 mCallbackBuffers.push(cbb); 268 269 LOGV("Adding callback buffer to queue, %d total", mCallbackBuffers.size()); 270 271 // We want to make sure the camera knows we're ready for the next frame. 272 // This may have come unset had we not had a callbackbuffer ready for it last time. 273 if (mManualBufferMode && !mManualCameraCallbackSet) { 274 mCamera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_CAMERA); 275 mManualCameraCallbackSet = true; 276 } 277 } else { 278 LOGE("Null byte array!"); 279 } 280 } 281 282 void JNICameraContext::clearCallbackBuffers_l(JNIEnv *env) 283 { 284 LOGV("Clearing callback buffers, %d remained", mCallbackBuffers.size()); 285 while(!mCallbackBuffers.isEmpty()) { 286 env->DeleteGlobalRef(mCallbackBuffers.top()); 287 mCallbackBuffers.pop(); 288 } 289 } 290 291 // connect to camera service 292 static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz, jobject weak_this) 293 { 294 sp<Camera> camera = Camera::connect(); 295 296 if (camera == NULL) { 297 jniThrowException(env, "java/lang/RuntimeException", 298 "Fail to connect to camera service"); 299 return; 300 } 301 302 // make sure camera hardware is alive 303 if (camera->getStatus() != NO_ERROR) { 304 jniThrowException(env, "java/lang/RuntimeException", "Camera initialization failed"); 305 return; 306 } 307 308 jclass clazz = env->GetObjectClass(thiz); 309 if (clazz == NULL) { 310 jniThrowException(env, "java/lang/RuntimeException", "Can't find android/hardware/Camera"); 311 return; 312 } 313 314 // We use a weak reference so the Camera object can be garbage collected. 315 // The reference is only used as a proxy for callbacks. 316 sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera); 317 context->incStrong(thiz); 318 camera->setListener(context); 319 320 // save context in opaque field 321 env->SetIntField(thiz, fields.context, (int)context.get()); 322 } 323 324 // disconnect from camera service 325 // It's okay to call this when the native camera context is already null. 326 // This handles the case where the user has called release() and the 327 // finalizer is invoked later. 328 static void android_hardware_Camera_release(JNIEnv *env, jobject thiz) 329 { 330 // TODO: Change to LOGV 331 LOGV("release camera"); 332 JNICameraContext* context = NULL; 333 sp<Camera> camera; 334 { 335 Mutex::Autolock _l(sLock); 336 context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context)); 337 338 // Make sure we do not attempt to callback on a deleted Java object. 339 env->SetIntField(thiz, fields.context, 0); 340 } 341 342 // clean up if release has not been called before 343 if (context != NULL) { 344 camera = context->getCamera(); 345 context->release(); 346 LOGV("native_release: context=%p camera=%p", context, camera.get()); 347 348 // clear callbacks 349 if (camera != NULL) { 350 camera->setPreviewCallbackFlags(FRAME_CALLBACK_FLAG_NOOP); 351 camera->disconnect(); 352 } 353 354 // remove context to prevent further Java access 355 context->decStrong(thiz); 356 } 357 } 358 359 static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject jSurface) 360 { 361 LOGV("setPreviewDisplay"); 362 sp<Camera> camera = get_native_camera(env, thiz, NULL); 363 if (camera == 0) return; 364 365 sp<Surface> surface = NULL; 366 if (jSurface != NULL) { 367 surface = reinterpret_cast<Surface*>(env->GetIntField(jSurface, fields.surface)); 368 } 369 if (camera->setPreviewDisplay(surface) != NO_ERROR) { 370 jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed"); 371 } 372 } 373 374 static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz) 375 { 376 LOGV("startPreview"); 377 sp<Camera> camera = get_native_camera(env, thiz, NULL); 378 if (camera == 0) return; 379 380 if (camera->startPreview() != NO_ERROR) { 381 jniThrowException(env, "java/lang/RuntimeException", "startPreview failed"); 382 return; 383 } 384 } 385 386 static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz) 387 { 388 LOGV("stopPreview"); 389 sp<Camera> c = get_native_camera(env, thiz, NULL); 390 if (c == 0) return; 391 392 c->stopPreview(); 393 } 394 395 static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz) 396 { 397 LOGV("previewEnabled"); 398 sp<Camera> c = get_native_camera(env, thiz, NULL); 399 if (c == 0) return false; 400 401 return c->previewEnabled(); 402 } 403 404 static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer) 405 { 406 LOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer); 407 // Important: Only install preview_callback if the Java code has called 408 // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy 409 // each preview frame for nothing. 410 JNICameraContext* context; 411 sp<Camera> camera = get_native_camera(env, thiz, &context); 412 if (camera == 0) return; 413 414 // setCallbackMode will take care of setting the context flags and calling 415 // camera->setPreviewCallbackFlags within a mutex for us. 416 context->setCallbackMode(env, installed, manualBuffer); 417 } 418 419 static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes) { 420 LOGV("addCallbackBuffer"); 421 422 JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context)); 423 424 if (context != NULL) { 425 context->addCallbackBuffer(env, bytes); 426 } 427 } 428 429 static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz) 430 { 431 LOGV("autoFocus"); 432 JNICameraContext* context; 433 sp<Camera> c = get_native_camera(env, thiz, &context); 434 if (c == 0) return; 435 436 if (c->autoFocus() != NO_ERROR) { 437 jniThrowException(env, "java/lang/RuntimeException", "autoFocus failed"); 438 } 439 } 440 441 static void android_hardware_Camera_cancelAutoFocus(JNIEnv *env, jobject thiz) 442 { 443 LOGV("cancelAutoFocus"); 444 JNICameraContext* context; 445 sp<Camera> c = get_native_camera(env, thiz, &context); 446 if (c == 0) return; 447 448 if (c->cancelAutoFocus() != NO_ERROR) { 449 jniThrowException(env, "java/lang/RuntimeException", "cancelAutoFocus failed"); 450 } 451 } 452 453 static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz) 454 { 455 LOGV("takePicture"); 456 JNICameraContext* context; 457 sp<Camera> camera = get_native_camera(env, thiz, &context); 458 if (camera == 0) return; 459 460 if (camera->takePicture() != NO_ERROR) { 461 jniThrowException(env, "java/lang/RuntimeException", "takePicture failed"); 462 return; 463 } 464 } 465 466 static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params) 467 { 468 LOGV("setParameters"); 469 sp<Camera> camera = get_native_camera(env, thiz, NULL); 470 if (camera == 0) return; 471 472 const jchar* str = env->GetStringCritical(params, 0); 473 String8 params8; 474 if (params) { 475 params8 = String8(str, env->GetStringLength(params)); 476 env->ReleaseStringCritical(params, str); 477 } 478 if (camera->setParameters(params8) != NO_ERROR) { 479 jniThrowException(env, "java/lang/RuntimeException", "setParameters failed"); 480 return; 481 } 482 } 483 484 static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz) 485 { 486 LOGV("getParameters"); 487 sp<Camera> camera = get_native_camera(env, thiz, NULL); 488 if (camera == 0) return 0; 489 490 return env->NewStringUTF(camera->getParameters().string()); 491 } 492 493 static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz) 494 { 495 LOGV("reconnect"); 496 sp<Camera> camera = get_native_camera(env, thiz, NULL); 497 if (camera == 0) return; 498 499 if (camera->reconnect() != NO_ERROR) { 500 jniThrowException(env, "java/io/IOException", "reconnect failed"); 501 return; 502 } 503 } 504 505 static void android_hardware_Camera_lock(JNIEnv *env, jobject thiz) 506 { 507 LOGV("lock"); 508 sp<Camera> camera = get_native_camera(env, thiz, NULL); 509 if (camera == 0) return; 510 511 if (camera->lock() != NO_ERROR) { 512 jniThrowException(env, "java/lang/RuntimeException", "lock failed"); 513 } 514 } 515 516 static void android_hardware_Camera_unlock(JNIEnv *env, jobject thiz) 517 { 518 LOGV("unlock"); 519 sp<Camera> camera = get_native_camera(env, thiz, NULL); 520 if (camera == 0) return; 521 522 if (camera->unlock() != NO_ERROR) { 523 jniThrowException(env, "java/lang/RuntimeException", "unlock failed"); 524 } 525 } 526 527 static void android_hardware_Camera_startSmoothZoom(JNIEnv *env, jobject thiz, jint value) 528 { 529 LOGV("startSmoothZoom"); 530 sp<Camera> camera = get_native_camera(env, thiz, NULL); 531 if (camera == 0) return; 532 533 status_t rc = camera->sendCommand(CAMERA_CMD_START_SMOOTH_ZOOM, value, 0); 534 if (rc == BAD_VALUE) { 535 char msg[64]; 536 sprintf(msg, "invalid zoom value=%d", value); 537 jniThrowException(env, "java/lang/IllegalArgumentException", msg); 538 } else if (rc != NO_ERROR) { 539 jniThrowException(env, "java/lang/RuntimeException", "start smooth zoom failed"); 540 } 541 } 542 543 static void android_hardware_Camera_stopSmoothZoom(JNIEnv *env, jobject thiz) 544 { 545 LOGV("stopSmoothZoom"); 546 sp<Camera> camera = get_native_camera(env, thiz, NULL); 547 if (camera == 0) return; 548 549 if (camera->sendCommand(CAMERA_CMD_STOP_SMOOTH_ZOOM, 0, 0) != NO_ERROR) { 550 jniThrowException(env, "java/lang/RuntimeException", "stop smooth zoom failed"); 551 } 552 } 553 554 static void android_hardware_Camera_setDisplayOrientation(JNIEnv *env, jobject thiz, 555 jint value) 556 { 557 LOGV("setDisplayOrientation"); 558 sp<Camera> camera = get_native_camera(env, thiz, NULL); 559 if (camera == 0) return; 560 561 if (camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION, value, 0) != NO_ERROR) { 562 jniThrowException(env, "java/lang/RuntimeException", "set display orientation failed"); 563 } 564 } 565 566 //------------------------------------------------- 567 568 static JNINativeMethod camMethods[] = { 569 { "native_setup", 570 "(Ljava/lang/Object;)V", 571 (void*)android_hardware_Camera_native_setup }, 572 { "native_release", 573 "()V", 574 (void*)android_hardware_Camera_release }, 575 { "setPreviewDisplay", 576 "(Landroid/view/Surface;)V", 577 (void *)android_hardware_Camera_setPreviewDisplay }, 578 { "startPreview", 579 "()V", 580 (void *)android_hardware_Camera_startPreview }, 581 { "stopPreview", 582 "()V", 583 (void *)android_hardware_Camera_stopPreview }, 584 { "previewEnabled", 585 "()Z", 586 (void *)android_hardware_Camera_previewEnabled }, 587 { "setHasPreviewCallback", 588 "(ZZ)V", 589 (void *)android_hardware_Camera_setHasPreviewCallback }, 590 { "addCallbackBuffer", 591 "([B)V", 592 (void *)android_hardware_Camera_addCallbackBuffer }, 593 { "native_autoFocus", 594 "()V", 595 (void *)android_hardware_Camera_autoFocus }, 596 { "native_cancelAutoFocus", 597 "()V", 598 (void *)android_hardware_Camera_cancelAutoFocus }, 599 { "native_takePicture", 600 "()V", 601 (void *)android_hardware_Camera_takePicture }, 602 { "native_setParameters", 603 "(Ljava/lang/String;)V", 604 (void *)android_hardware_Camera_setParameters }, 605 { "native_getParameters", 606 "()Ljava/lang/String;", 607 (void *)android_hardware_Camera_getParameters }, 608 { "reconnect", 609 "()V", 610 (void*)android_hardware_Camera_reconnect }, 611 { "lock", 612 "()V", 613 (void*)android_hardware_Camera_lock }, 614 { "unlock", 615 "()V", 616 (void*)android_hardware_Camera_unlock }, 617 { "startSmoothZoom", 618 "(I)V", 619 (void *)android_hardware_Camera_startSmoothZoom }, 620 { "stopSmoothZoom", 621 "()V", 622 (void *)android_hardware_Camera_stopSmoothZoom }, 623 { "setDisplayOrientation", 624 "(I)V", 625 (void *)android_hardware_Camera_setDisplayOrientation }, 626 }; 627 628 struct field { 629 const char *class_name; 630 const char *field_name; 631 const char *field_type; 632 jfieldID *jfield; 633 }; 634 635 static int find_fields(JNIEnv *env, field *fields, int count) 636 { 637 for (int i = 0; i < count; i++) { 638 field *f = &fields[i]; 639 jclass clazz = env->FindClass(f->class_name); 640 if (clazz == NULL) { 641 LOGE("Can't find %s", f->class_name); 642 return -1; 643 } 644 645 jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type); 646 if (field == NULL) { 647 LOGE("Can't find %s.%s", f->class_name, f->field_name); 648 return -1; 649 } 650 651 *(f->jfield) = field; 652 } 653 654 return 0; 655 } 656 657 // Get all the required offsets in java class and register native functions 658 int register_android_hardware_Camera(JNIEnv *env) 659 { 660 field fields_to_find[] = { 661 { "android/hardware/Camera", "mNativeContext", "I", &fields.context }, 662 { "android/view/Surface", "mSurface", "I", &fields.surface } 663 }; 664 665 if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0) 666 return -1; 667 668 jclass clazz = env->FindClass("android/hardware/Camera"); 669 fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative", 670 "(Ljava/lang/Object;IIILjava/lang/Object;)V"); 671 if (fields.post_event == NULL) { 672 LOGE("Can't find android/hardware/Camera.postEventFromNative"); 673 return -1; 674 } 675 676 677 // Register native functions 678 return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera", 679 camMethods, NELEM(camMethods)); 680 } 681 682
