android_media_MediaScanner.cpp revision c37255d5d0fd9e0ec02b0d7cb5c4b235e200d367
1/* //device/libs/media_jni/MediaScanner.cpp 2** 3** Copyright 2007, 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 "MediaScanner" 19#include "utils/Log.h" 20 21#include <media/mediascanner.h> 22#include <stdio.h> 23#include <assert.h> 24#include <limits.h> 25#include <unistd.h> 26#include <fcntl.h> 27#include <cutils/properties.h> 28#include <utils/threads.h> 29 30#include "jni.h" 31#include "JNIHelp.h" 32#include "android_runtime/AndroidRuntime.h" 33 34#include <media/stagefright/StagefrightMediaScanner.h> 35 36// ---------------------------------------------------------------------------- 37 38using namespace android; 39 40// ---------------------------------------------------------------------------- 41 42struct fields_t { 43 jfieldID context; 44}; 45static fields_t fields; 46 47// ---------------------------------------------------------------------------- 48 49class MyMediaScannerClient : public MediaScannerClient 50{ 51public: 52 MyMediaScannerClient(JNIEnv *env, jobject client) 53 : mEnv(env), 54 mClient(env->NewGlobalRef(client)), 55 mScanFileMethodID(0), 56 mHandleStringTagMethodID(0), 57 mSetMimeTypeMethodID(0) 58 { 59 jclass mediaScannerClientInterface = env->FindClass("android/media/MediaScannerClient"); 60 if (mediaScannerClientInterface == NULL) { 61 fprintf(stderr, "android/media/MediaScannerClient not found\n"); 62 } 63 else { 64 mScanFileMethodID = env->GetMethodID(mediaScannerClientInterface, "scanFile", 65 "(Ljava/lang/String;JJ)V"); 66 mHandleStringTagMethodID = env->GetMethodID(mediaScannerClientInterface, "handleStringTag", 67 "(Ljava/lang/String;Ljava/lang/String;)V"); 68 mSetMimeTypeMethodID = env->GetMethodID(mediaScannerClientInterface, "setMimeType", 69 "(Ljava/lang/String;)V"); 70 mAddNoMediaFolderMethodID = env->GetMethodID(mediaScannerClientInterface, "addNoMediaFolder", 71 "(Ljava/lang/String;)V"); 72 } 73 } 74 75 virtual ~MyMediaScannerClient() 76 { 77 mEnv->DeleteGlobalRef(mClient); 78 } 79 80 // returns true if it succeeded, false if an exception occured in the Java code 81 virtual bool scanFile(const char* path, long long lastModified, long long fileSize) 82 { 83 jstring pathStr; 84 if ((pathStr = mEnv->NewStringUTF(path)) == NULL) return false; 85 86 mEnv->CallVoidMethod(mClient, mScanFileMethodID, pathStr, lastModified, fileSize); 87 88 mEnv->DeleteLocalRef(pathStr); 89 return (!mEnv->ExceptionCheck()); 90 } 91 92 // returns true if it succeeded, false if an exception occured in the Java code 93 virtual bool handleStringTag(const char* name, const char* value) 94 { 95 jstring nameStr, valueStr; 96 if ((nameStr = mEnv->NewStringUTF(name)) == NULL) return false; 97 if ((valueStr = mEnv->NewStringUTF(value)) == NULL) return false; 98 99 mEnv->CallVoidMethod(mClient, mHandleStringTagMethodID, nameStr, valueStr); 100 101 mEnv->DeleteLocalRef(nameStr); 102 mEnv->DeleteLocalRef(valueStr); 103 return (!mEnv->ExceptionCheck()); 104 } 105 106 // returns true if it succeeded, false if an exception occured in the Java code 107 virtual bool setMimeType(const char* mimeType) 108 { 109 jstring mimeTypeStr; 110 if ((mimeTypeStr = mEnv->NewStringUTF(mimeType)) == NULL) return false; 111 112 mEnv->CallVoidMethod(mClient, mSetMimeTypeMethodID, mimeTypeStr); 113 114 mEnv->DeleteLocalRef(mimeTypeStr); 115 return (!mEnv->ExceptionCheck()); 116 } 117 118 // returns true if it succeeded, false if an exception occured in the Java code 119 virtual bool addNoMediaFolder(const char* path) 120 { 121 jstring pathStr; 122 if ((pathStr = mEnv->NewStringUTF(path)) == NULL) return false; 123 124 mEnv->CallVoidMethod(mClient, mAddNoMediaFolderMethodID, pathStr); 125 126 mEnv->DeleteLocalRef(pathStr); 127 return (!mEnv->ExceptionCheck()); 128 } 129 130 131private: 132 JNIEnv *mEnv; 133 jobject mClient; 134 jmethodID mScanFileMethodID; 135 jmethodID mHandleStringTagMethodID; 136 jmethodID mSetMimeTypeMethodID; 137 jmethodID mAddNoMediaFolderMethodID; 138}; 139 140 141// ---------------------------------------------------------------------------- 142 143static bool ExceptionCheck(void* env) 144{ 145 return ((JNIEnv *)env)->ExceptionCheck(); 146} 147 148static void 149android_media_MediaScanner_processDirectory(JNIEnv *env, jobject thiz, jstring path, jobject client) 150{ 151 MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context); 152 153 if (path == NULL) { 154 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 155 return; 156 } 157 158 const char *pathStr = env->GetStringUTFChars(path, NULL); 159 if (pathStr == NULL) { // Out of memory 160 jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); 161 return; 162 } 163 164 MyMediaScannerClient myClient(env, client); 165 mp->processDirectory(pathStr, myClient, ExceptionCheck, env); 166 env->ReleaseStringUTFChars(path, pathStr); 167} 168 169static void 170android_media_MediaScanner_processFile(JNIEnv *env, jobject thiz, jstring path, jstring mimeType, jobject client) 171{ 172 MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context); 173 174 if (path == NULL) { 175 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 176 return; 177 } 178 179 const char *pathStr = env->GetStringUTFChars(path, NULL); 180 if (pathStr == NULL) { // Out of memory 181 jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); 182 return; 183 } 184 const char *mimeTypeStr = (mimeType ? env->GetStringUTFChars(mimeType, NULL) : NULL); 185 if (mimeType && mimeTypeStr == NULL) { // Out of memory 186 env->ReleaseStringUTFChars(path, pathStr); 187 jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); 188 return; 189 } 190 191 MyMediaScannerClient myClient(env, client); 192 mp->processFile(pathStr, mimeTypeStr, myClient); 193 env->ReleaseStringUTFChars(path, pathStr); 194 if (mimeType) { 195 env->ReleaseStringUTFChars(mimeType, mimeTypeStr); 196 } 197} 198 199static void 200android_media_MediaScanner_setLocale(JNIEnv *env, jobject thiz, jstring locale) 201{ 202 MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context); 203 204 if (locale == NULL) { 205 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 206 return; 207 } 208 const char *localeStr = env->GetStringUTFChars(locale, NULL); 209 if (localeStr == NULL) { // Out of memory 210 jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); 211 return; 212 } 213 mp->setLocale(localeStr); 214 215 env->ReleaseStringUTFChars(locale, localeStr); 216} 217 218static jbyteArray 219android_media_MediaScanner_extractAlbumArt(JNIEnv *env, jobject thiz, jobject fileDescriptor) 220{ 221 MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context); 222 223 if (fileDescriptor == NULL) { 224 jniThrowException(env, "java/lang/IllegalArgumentException", NULL); 225 return NULL; 226 } 227 228 int fd = getParcelFileDescriptorFD(env, fileDescriptor); 229 char* data = mp->extractAlbumArt(fd); 230 if (!data) { 231 return NULL; 232 } 233 long len = *((long*)data); 234 235 jbyteArray array = env->NewByteArray(len); 236 if (array != NULL) { 237 jbyte* bytes = env->GetByteArrayElements(array, NULL); 238 memcpy(bytes, data + 4, len); 239 env->ReleaseByteArrayElements(array, bytes, 0); 240 } 241 242done: 243 free(data); 244 // if NewByteArray() returned NULL, an out-of-memory 245 // exception will have been raised. I just want to 246 // return null in that case. 247 env->ExceptionClear(); 248 return array; 249} 250 251// This function gets a field ID, which in turn causes class initialization. 252// It is called from a static block in MediaScanner, which won't run until the 253// first time an instance of this class is used. 254static void 255android_media_MediaScanner_native_init(JNIEnv *env) 256{ 257 jclass clazz; 258 259 clazz = env->FindClass("android/media/MediaScanner"); 260 if (clazz == NULL) { 261 jniThrowException(env, "java/lang/RuntimeException", "Can't find android/media/MediaScanner"); 262 return; 263 } 264 265 fields.context = env->GetFieldID(clazz, "mNativeContext", "I"); 266 if (fields.context == NULL) { 267 jniThrowException(env, "java/lang/RuntimeException", "Can't find MediaScanner.mNativeContext"); 268 return; 269 } 270} 271 272static void 273android_media_MediaScanner_native_setup(JNIEnv *env, jobject thiz) 274{ 275 MediaScanner *mp = new StagefrightMediaScanner; 276 277 if (mp == NULL) { 278 jniThrowException(env, "java/lang/RuntimeException", "Out of memory"); 279 return; 280 } 281 282 env->SetIntField(thiz, fields.context, (int)mp); 283} 284 285static void 286android_media_MediaScanner_native_finalize(JNIEnv *env, jobject thiz) 287{ 288 MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context); 289 290 //printf("##### android_media_MediaScanner_native_finalize: ctx=0x%p\n", ctx); 291 292 if (mp == 0) 293 return; 294 295 delete mp; 296} 297 298// ---------------------------------------------------------------------------- 299 300static JNINativeMethod gMethods[] = { 301 {"processDirectory", "(Ljava/lang/String;Landroid/media/MediaScannerClient;)V", 302 (void *)android_media_MediaScanner_processDirectory}, 303 {"processFile", "(Ljava/lang/String;Ljava/lang/String;Landroid/media/MediaScannerClient;)V", 304 (void *)android_media_MediaScanner_processFile}, 305 {"setLocale", "(Ljava/lang/String;)V", (void *)android_media_MediaScanner_setLocale}, 306 {"extractAlbumArt", "(Ljava/io/FileDescriptor;)[B", (void *)android_media_MediaScanner_extractAlbumArt}, 307 {"native_init", "()V", (void *)android_media_MediaScanner_native_init}, 308 {"native_setup", "()V", (void *)android_media_MediaScanner_native_setup}, 309 {"native_finalize", "()V", (void *)android_media_MediaScanner_native_finalize}, 310}; 311 312static const char* const kClassPathName = "android/media/MediaScanner"; 313 314// This function only registers the native methods, and is called from 315// JNI_OnLoad in android_media_MediaPlayer.cpp 316int register_android_media_MediaScanner(JNIEnv *env) 317{ 318 return AndroidRuntime::registerNativeMethods(env, 319 "android/media/MediaScanner", gMethods, NELEM(gMethods)); 320} 321 322 323