android_hardware_Camera.cpp revision b798689749c64baba81f02e10cf2157c747d6b46
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_TAG "Camera-JNI" 19 20#include "jni.h" 21#include "JNIHelp.h" 22#include "android_runtime/AndroidRuntime.h" 23 24#include <ui/Surface.h> 25#include <ui/Camera.h> 26#include <utils/IMemory.h> 27 28using namespace android; 29 30enum CallbackMessageID { 31 kShutterCallback = 0, 32 kRawCallback = 1, 33 kJpegCallback = 2, 34 kPreviewCallback = 3, 35 kAutoFocusCallback = 4, 36 kErrorCallback = 5 37}; 38 39enum CameraError { 40 kCameraErrorUnknown = 1, 41 kCameraErrorMediaServer = 100 42}; 43 44 45struct fields_t { 46 jfieldID context; 47 jfieldID surface; 48 jfieldID listener_context; 49 jmethodID post_event; 50}; 51 52static fields_t fields; 53static Mutex sLock; 54 55struct callback_cookie { 56 jclass camera_class; 57 jobject camera_ref; 58}; 59 60sp<Camera> get_native_camera(JNIEnv *env, jobject thiz) 61{ 62 Mutex::Autolock _l(sLock); 63 sp<Camera> c = reinterpret_cast<Camera*>(env->GetIntField(thiz, fields.context)); 64 if (c == 0) 65 jniThrowException(env, "java/lang/RuntimeException", "Method called after release()"); 66 67 return c; 68} 69 70static void err_callback(status_t err, void *cookie) 71{ 72 JNIEnv *env = AndroidRuntime::getJNIEnv(); 73 callback_cookie *c = (callback_cookie *)cookie; 74 int error; 75 76 switch (err) { 77 case DEAD_OBJECT: 78 error = kCameraErrorMediaServer; 79 break; 80 default: 81 error = kCameraErrorUnknown; 82 break; 83 } 84 LOGV("err_callback: camera_ref=%x, cookie=%x", (int)c->camera_ref, (int)cookie); 85 86 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 87 c->camera_ref, kErrorCallback, error, 0, NULL); 88} 89 90// connect to camera service 91static void android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz, jobject weak_this) 92{ 93 sp<Camera> c = Camera::connect(); 94 95 if (c == NULL) { 96 jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); 97 return; 98 } 99 100 // make sure camera hardware is alive 101 if (c->getStatus() != NO_ERROR) { 102 jniThrowException(env, "java/io/IOException", "Camera initialization failed"); 103 return; 104 } 105 106 callback_cookie *cookie = new callback_cookie; 107 jclass clazz = env->GetObjectClass(thiz); 108 if (clazz == NULL) { 109 LOGE("Can't find android/hardware/Camera"); 110 // XXX no idea what to throw here, can this even happen? 111 jniThrowException(env, "java/lang/Exception", NULL); 112 return; 113 } 114 cookie->camera_class = (jclass)env->NewGlobalRef(clazz); 115 116 // We use a weak reference so the Camera object can be garbage collected. 117 // The reference is only used as a proxy for callbacks. 118 cookie->camera_ref = env->NewGlobalRef(weak_this); 119 env->SetIntField(thiz, fields.listener_context, (int)cookie); 120 121 LOGV("native_setup: camera_ref=%x, camera_obj=%x, cookie=%x", (int)cookie->camera_ref, (int)thiz, (int)cookie); 122 123 // save camera object in opaque field 124 env->SetIntField(thiz, fields.context, reinterpret_cast<int>(c.get())); 125 126 c->setErrorCallback(err_callback, cookie); 127 128 // hold a strong reference so the camera doesn't go away while the app is still running 129 c->incStrong(thiz); 130} 131 132// disconnect from camera service 133static void android_hardware_Camera_release(JNIEnv *env, jobject thiz) 134{ 135 Mutex::Autolock _l(sLock); 136 sp<Camera> c = reinterpret_cast<Camera*>(env->GetIntField(thiz, fields.context)); 137 // It's okay to call this when the native camera context is already null. 138 // This handles the case where the user has called release() and the 139 // finalizer is invoked later. 140 if (c != 0) { 141 // Make sure that we do not attempt to deliver an eror callback on a deleted 142 // Java object. 143 c->setErrorCallback(NULL, NULL); 144 c->disconnect(); 145 146 // remove our strong reference created in native setup 147 c->decStrong(thiz); 148 env->SetIntField(thiz, fields.context, 0); 149 150 callback_cookie *cookie = (callback_cookie *)env->GetIntField(thiz, fields.listener_context); 151 152 LOGV("release: camera_ref=%x, camera_obj=%x, cookie=%x", (int)cookie->camera_ref, (int)thiz, (int)cookie); 153 154 if (cookie) { 155 env->DeleteGlobalRef(cookie->camera_ref); 156 env->DeleteGlobalRef(cookie->camera_class); 157 delete cookie; 158 env->SetIntField(thiz, fields.listener_context, 0); 159 } 160 } 161} 162 163static void android_hardware_Camera_setPreviewDisplay(JNIEnv *env, jobject thiz, jobject surface) 164{ 165 sp<Camera> c = get_native_camera(env, thiz); 166 if (c == 0) 167 return; 168 169 sp<Surface> s = (Surface *)env->GetIntField(surface, fields.surface); 170 if (c->setPreviewDisplay(s) != NO_ERROR) { 171 jniThrowException(env, "java/io/IOException", "setPreviewDisplay failed"); 172 return; 173 } 174} 175 176static void preview_callback(const sp<IMemory>& mem, void *cookie) 177{ 178 JNIEnv *env = AndroidRuntime::getJNIEnv(); 179 callback_cookie *c = (callback_cookie *)cookie; 180 int arg1 = 0, arg2 = 0; 181 jobject obj = NULL; 182 183 ssize_t offset; 184 size_t size; 185 sp<IMemoryHeap> heap = mem->getMemory(&offset, &size); 186 187 uint8_t *data = ((uint8_t *)heap->base()) + offset; 188 189 jbyteArray array = env->NewByteArray(size); 190 if (array == NULL) { 191 LOGE("Couldn't allocate byte array for YUV data"); 192 env->ExceptionClear(); 193 return; 194 } 195 196 jbyte *bytes = env->GetByteArrayElements(array, NULL); 197 memcpy(bytes, data, size); 198 env->ReleaseByteArrayElements(array, bytes, 0); 199 200 obj = array; 201 202 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 203 c->camera_ref, kPreviewCallback, arg1, arg2, obj); 204 env->DeleteLocalRef(array); 205} 206 207static void android_hardware_Camera_startPreview(JNIEnv *env, jobject thiz) 208{ 209 sp<Camera> c = get_native_camera(env, thiz); 210 if (c == 0) 211 return; 212 213 if (c->startPreview() != NO_ERROR) { 214 jniThrowException(env, "java/io/IOException", "startPreview failed"); 215 return; 216 } 217} 218 219static void android_hardware_Camera_stopPreview(JNIEnv *env, jobject thiz) 220{ 221 sp<Camera> c = get_native_camera(env, thiz); 222 if (c == 0) 223 return; 224 225 c->stopPreview(); 226} 227 228static bool android_hardware_Camera_previewEnabled(JNIEnv *env, jobject thiz) 229{ 230 sp<Camera> c = get_native_camera(env, thiz); 231 if (c == 0) 232 return false; 233 234 return c->previewEnabled(); 235} 236 237static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed) 238{ 239 sp<Camera> c = get_native_camera(env, thiz); 240 if (c == 0) 241 return; 242 243 // Important: Only install preview_callback if the Java code has called 244 // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy 245 // each preview frame for nothing. 246 callback_cookie *cookie = (callback_cookie *)env->GetIntField(thiz, fields.listener_context); 247 248 c->setFrameCallback(installed ? preview_callback : NULL, 249 cookie, 250 installed ? FRAME_CALLBACK_FLAG_CAMERA: FRAME_CALLBACK_FLAG_NOOP); 251} 252 253static void autofocus_callback_impl(bool success, void *cookie) 254{ 255 JNIEnv *env = AndroidRuntime::getJNIEnv(); 256 callback_cookie *c = (callback_cookie *)cookie; 257 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 258 c->camera_ref, kAutoFocusCallback, 259 success, 0, NULL); 260} 261 262 263 264static void android_hardware_Camera_autoFocus(JNIEnv *env, jobject thiz) 265{ 266 sp<Camera> c = get_native_camera(env, thiz); 267 if (c == 0) 268 return; 269 callback_cookie *cookie = (callback_cookie *)env->GetIntField(thiz, fields.listener_context); 270 c->setAutoFocusCallback(autofocus_callback_impl, cookie); 271 if (c->autoFocus() != NO_ERROR) { 272 jniThrowException(env, "java/io/IOException", "autoFocus failed"); 273 } 274} 275 276static void jpeg_callback(const sp<IMemory>& mem, void *cookie) 277{ 278 JNIEnv *env = AndroidRuntime::getJNIEnv(); 279 callback_cookie *c = (callback_cookie *)cookie; 280 int arg1 = 0, arg2 = 0; 281 jobject obj = NULL; 282 283 if (mem == NULL) { 284 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 285 c->camera_ref, kJpegCallback, arg1, arg2, NULL); 286 return; 287 } 288 ssize_t offset; 289 size_t size; 290 sp<IMemoryHeap> heap = mem->getMemory(&offset, &size); 291 LOGV("jpeg_callback: mem off=%d, size=%d", offset, size); 292 293 uint8_t *heap_base = (uint8_t *)heap->base(); 294 if (heap_base == NULL) { 295 LOGE("YUV heap is NULL"); 296 return; 297 } 298 299 uint8_t *data = heap_base + offset; 300 301 jbyteArray array = env->NewByteArray(size); 302 if (array == NULL) { 303 LOGE("Couldn't allocate byte array for JPEG data"); 304 env->ExceptionClear(); 305 return; 306 } 307 308 jbyte *bytes = env->GetByteArrayElements(array, NULL); 309 memcpy(bytes, data, size); 310 env->ReleaseByteArrayElements(array, bytes, 0); 311 312 obj = array; 313 314 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 315 c->camera_ref, kJpegCallback, arg1, arg2, obj); 316 env->DeleteLocalRef(array); 317} 318 319static void shutter_callback_impl(void *cookie) 320{ 321 JNIEnv *env = AndroidRuntime::getJNIEnv(); 322 callback_cookie *c = (callback_cookie *)cookie; 323 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 324 c->camera_ref, kShutterCallback, 0, 0, NULL); 325} 326 327static void raw_callback(const sp<IMemory>& mem __attribute__((unused)), 328 void *cookie) 329{ 330 JNIEnv *env = AndroidRuntime::getJNIEnv(); 331 callback_cookie *c = (callback_cookie *)cookie; 332 env->CallStaticVoidMethod(c->camera_class, fields.post_event, 333 c->camera_ref, kRawCallback, 0, 0, NULL); 334} 335 336static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz) 337{ 338 sp<Camera> c = get_native_camera(env, thiz); 339 if (c == 0) 340 return; 341 342 callback_cookie *cookie = 343 (callback_cookie *)env->GetIntField(thiz, fields.listener_context); 344 c->setShutterCallback(shutter_callback_impl, cookie); 345 c->setRawCallback(raw_callback, cookie); 346 c->setJpegCallback(jpeg_callback, cookie); 347 if (c->takePicture() != NO_ERROR) { 348 jniThrowException(env, "java/io/IOException", "takePicture failed"); 349 return; 350 } 351 352 return; 353} 354 355static void android_hardware_Camera_setParameters(JNIEnv *env, jobject thiz, jstring params) 356{ 357 sp<Camera> c = get_native_camera(env, thiz); 358 if (c == 0) 359 return; 360 361 const jchar* str = env->GetStringCritical(params, 0); 362 String8 params8; 363 if (params) { 364 params8 = String8(str, env->GetStringLength(params)); 365 env->ReleaseStringCritical(params, str); 366 } 367 if (c->setParameters(params8) != NO_ERROR) { 368 jniThrowException(env, "java/lang/IllegalArgumentException", "setParameters failed"); 369 return; 370 } 371} 372 373static jstring android_hardware_Camera_getParameters(JNIEnv *env, jobject thiz) 374{ 375 sp<Camera> c = get_native_camera(env, thiz); 376 if (c == 0) 377 return 0; 378 379 return env->NewStringUTF(c->getParameters().string()); 380} 381 382static void android_hardware_Camera_reconnect(JNIEnv *env, jobject thiz) 383{ 384 sp<Camera> c = get_native_camera(env, thiz); 385 if (c == 0) 386 return; 387 388 if (c->reconnect() != NO_ERROR) { 389 jniThrowException(env, "java/io/IOException", "reconnect failed"); 390 return; 391 } 392} 393 394static jint android_hardware_Camera_lock(JNIEnv *env, jobject thiz) 395{ 396 sp<Camera> c = get_native_camera(env, thiz); 397 if (c == 0) 398 return INVALID_OPERATION; 399 return (jint) c->lock(); 400} 401 402static jint android_hardware_Camera_unlock(JNIEnv *env, jobject thiz) 403{ 404 sp<Camera> c = get_native_camera(env, thiz); 405 if (c == 0) 406 return INVALID_OPERATION; 407 return (jint) c->lock(); 408} 409 410//------------------------------------------------- 411 412static JNINativeMethod camMethods[] = { 413 { "native_setup", 414 "(Ljava/lang/Object;)V", 415 (void*)android_hardware_Camera_native_setup }, 416 { "native_release", 417 "()V", 418 (void*)android_hardware_Camera_release }, 419 { "setPreviewDisplay", 420 "(Landroid/view/Surface;)V", 421 (void *)android_hardware_Camera_setPreviewDisplay }, 422 { "startPreview", 423 "()V", 424 (void *)android_hardware_Camera_startPreview }, 425 { "stopPreview", 426 "()V", 427 (void *)android_hardware_Camera_stopPreview }, 428 { "previewEnabled", 429 "()Z", 430 (void *)android_hardware_Camera_previewEnabled }, 431 { "setHasPreviewCallback", 432 "(Z)V", 433 (void *)android_hardware_Camera_setHasPreviewCallback }, 434 { "native_autoFocus", 435 "()V", 436 (void *)android_hardware_Camera_autoFocus }, 437 { "native_takePicture", 438 "()V", 439 (void *)android_hardware_Camera_takePicture }, 440 { "native_setParameters", 441 "(Ljava/lang/String;)V", 442 (void *)android_hardware_Camera_setParameters }, 443 { "native_getParameters", 444 "()Ljava/lang/String;", 445 (void *)android_hardware_Camera_getParameters }, 446 { "reconnect", 447 "()V", 448 (void*)android_hardware_Camera_reconnect }, 449 { "lock", 450 "()I", 451 (void*)android_hardware_Camera_lock }, 452 { "unlock", 453 "()I", 454 (void*)android_hardware_Camera_unlock }, 455}; 456 457struct field { 458 const char *class_name; 459 const char *field_name; 460 const char *field_type; 461 jfieldID *jfield; 462}; 463 464static int find_fields(JNIEnv *env, field *fields, int count) 465{ 466 for (int i = 0; i < count; i++) { 467 field *f = &fields[i]; 468 jclass clazz = env->FindClass(f->class_name); 469 if (clazz == NULL) { 470 LOGE("Can't find %s", f->class_name); 471 return -1; 472 } 473 474 jfieldID field = env->GetFieldID(clazz, f->field_name, f->field_type); 475 if (field == NULL) { 476 LOGE("Can't find %s.%s", f->class_name, f->field_name); 477 return -1; 478 } 479 480 *(f->jfield) = field; 481 } 482 483 return 0; 484} 485 486// Get all the required offsets in java class and register native functions 487int register_android_hardware_Camera(JNIEnv *env) 488{ 489 field fields_to_find[] = { 490 { "android/hardware/Camera", "mNativeContext", "I", &fields.context }, 491 { "android/hardware/Camera", "mListenerContext", "I", &fields.listener_context }, 492 { "android/view/Surface", "mSurface", "I", &fields.surface } 493 }; 494 495 if (find_fields(env, fields_to_find, NELEM(fields_to_find)) < 0) 496 return -1; 497 498 jclass clazz = env->FindClass("android/hardware/Camera"); 499 fields.post_event = env->GetStaticMethodID(clazz, "postEventFromNative", 500 "(Ljava/lang/Object;IIILjava/lang/Object;)V"); 501 if (fields.post_event == NULL) { 502 LOGE("Can't find android/hardware/Camera.postEventFromNative"); 503 return -1; 504 } 505 506 507 // Register native functions 508 return AndroidRuntime::registerNativeMethods(env, "android/hardware/Camera", 509 camMethods, NELEM(camMethods)); 510} 511 512