blob: 6a5404e33e5815062095becce049901e69b7e9a5 [file] [log] [blame]
/* //device/libs/media_jni/MediaScanner.cpp
**
** Copyright 2007, 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_TAG "MediaScanner"
#include "utils/Log.h"
#include <media/mediascanner.h>
#include <stdio.h>
#include <assert.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <utils/threads.h>
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
// ----------------------------------------------------------------------------
using namespace android;
// ----------------------------------------------------------------------------
struct fields_t {
jfieldID context;
};
static fields_t fields;
// ----------------------------------------------------------------------------
class MyMediaScannerClient : public MediaScannerClient
{
public:
MyMediaScannerClient(JNIEnv *env, jobject client)
: mEnv(env),
mClient(env->NewGlobalRef(client)),
mScanFileMethodID(0),
mHandleStringTagMethodID(0),
mSetMimeTypeMethodID(0)
{
jclass mediaScannerClientInterface = env->FindClass("android/media/MediaScannerClient");
if (mediaScannerClientInterface == NULL) {
fprintf(stderr, "android/media/MediaScannerClient not found\n");
}
else {
mScanFileMethodID = env->GetMethodID(mediaScannerClientInterface, "scanFile",
"(Ljava/lang/String;JJ)V");
mHandleStringTagMethodID = env->GetMethodID(mediaScannerClientInterface, "handleStringTag",
"(Ljava/lang/String;Ljava/lang/String;)V");
mSetMimeTypeMethodID = env->GetMethodID(mediaScannerClientInterface, "setMimeType",
"(Ljava/lang/String;)V");
mAddNoMediaFolderMethodID = env->GetMethodID(mediaScannerClientInterface, "addNoMediaFolder",
"(Ljava/lang/String;)V");
}
}
virtual ~MyMediaScannerClient()
{
mEnv->DeleteGlobalRef(mClient);
}
// returns true if it succeeded, false if an exception occured in the Java code
virtual bool scanFile(const char* path, long long lastModified, long long fileSize)
{
jstring pathStr;
if ((pathStr = mEnv->NewStringUTF(path)) == NULL) return false;
mEnv->CallVoidMethod(mClient, mScanFileMethodID, pathStr, lastModified, fileSize);
mEnv->DeleteLocalRef(pathStr);
return (!mEnv->ExceptionCheck());
}
// returns true if it succeeded, false if an exception occured in the Java code
virtual bool handleStringTag(const char* name, const char* value)
{
jstring nameStr, valueStr;
if ((nameStr = mEnv->NewStringUTF(name)) == NULL) return false;
if ((valueStr = mEnv->NewStringUTF(value)) == NULL) return false;
mEnv->CallVoidMethod(mClient, mHandleStringTagMethodID, nameStr, valueStr);
mEnv->DeleteLocalRef(nameStr);
mEnv->DeleteLocalRef(valueStr);
return (!mEnv->ExceptionCheck());
}
// returns true if it succeeded, false if an exception occured in the Java code
virtual bool setMimeType(const char* mimeType)
{
jstring mimeTypeStr;
if ((mimeTypeStr = mEnv->NewStringUTF(mimeType)) == NULL) return false;
mEnv->CallVoidMethod(mClient, mSetMimeTypeMethodID, mimeTypeStr);
mEnv->DeleteLocalRef(mimeTypeStr);
return (!mEnv->ExceptionCheck());
}
// returns true if it succeeded, false if an exception occured in the Java code
virtual bool addNoMediaFolder(const char* path)
{
jstring pathStr;
if ((pathStr = mEnv->NewStringUTF(path)) == NULL) return false;
mEnv->CallVoidMethod(mClient, mAddNoMediaFolderMethodID, pathStr);
mEnv->DeleteLocalRef(pathStr);
return (!mEnv->ExceptionCheck());
}
private:
JNIEnv *mEnv;
jobject mClient;
jmethodID mScanFileMethodID;
jmethodID mHandleStringTagMethodID;
jmethodID mSetMimeTypeMethodID;
jmethodID mAddNoMediaFolderMethodID;
};
// ----------------------------------------------------------------------------
static bool ExceptionCheck(void* env)
{
return ((JNIEnv *)env)->ExceptionCheck();
}
static void
android_media_MediaScanner_processDirectory(JNIEnv *env, jobject thiz, jstring path, jstring extensions, jobject client)
{
MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context);
if (path == NULL) {
jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
return;
}
if (extensions == NULL) {
jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
return;
}
const char *pathStr = env->GetStringUTFChars(path, NULL);
if (pathStr == NULL) { // Out of memory
jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
return;
}
const char *extensionsStr = env->GetStringUTFChars(extensions, NULL);
if (extensionsStr == NULL) { // Out of memory
env->ReleaseStringUTFChars(path, pathStr);
jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
return;
}
MyMediaScannerClient myClient(env, client);
mp->processDirectory(pathStr, extensionsStr, myClient, ExceptionCheck, env);
env->ReleaseStringUTFChars(path, pathStr);
env->ReleaseStringUTFChars(extensions, extensionsStr);
}
static void
android_media_MediaScanner_processFile(JNIEnv *env, jobject thiz, jstring path, jstring mimeType, jobject client)
{
MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context);
if (path == NULL) {
jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
return;
}
const char *pathStr = env->GetStringUTFChars(path, NULL);
if (pathStr == NULL) { // Out of memory
jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
return;
}
const char *mimeTypeStr = (mimeType ? env->GetStringUTFChars(mimeType, NULL) : NULL);
if (mimeType && mimeTypeStr == NULL) { // Out of memory
env->ReleaseStringUTFChars(path, pathStr);
jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
return;
}
MyMediaScannerClient myClient(env, client);
mp->processFile(pathStr, mimeTypeStr, myClient);
env->ReleaseStringUTFChars(path, pathStr);
if (mimeType) {
env->ReleaseStringUTFChars(mimeType, mimeTypeStr);
}
}
static void
android_media_MediaScanner_setLocale(JNIEnv *env, jobject thiz, jstring locale)
{
MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context);
if (locale == NULL) {
jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
return;
}
const char *localeStr = env->GetStringUTFChars(locale, NULL);
if (localeStr == NULL) { // Out of memory
jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
return;
}
mp->setLocale(localeStr);
env->ReleaseStringUTFChars(locale, localeStr);
}
static jbyteArray
android_media_MediaScanner_extractAlbumArt(JNIEnv *env, jobject thiz, jobject fileDescriptor)
{
MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context);
if (fileDescriptor == NULL) {
jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
return NULL;
}
int fd = getParcelFileDescriptorFD(env, fileDescriptor);
char* data = mp->extractAlbumArt(fd);
if (!data) {
return NULL;
}
long len = *((long*)data);
jbyteArray array = env->NewByteArray(len);
if (array != NULL) {
jbyte* bytes = env->GetByteArrayElements(array, NULL);
memcpy(bytes, data + 4, len);
env->ReleaseByteArrayElements(array, bytes, 0);
}
done:
free(data);
// if NewByteArray() returned NULL, an out-of-memory
// exception will have been raised. I just want to
// return null in that case.
env->ExceptionClear();
return array;
}
// This function gets a field ID, which in turn causes class initialization.
// It is called from a static block in MediaScanner, which won't run until the
// first time an instance of this class is used.
static void
android_media_MediaScanner_native_init(JNIEnv *env)
{
jclass clazz;
clazz = env->FindClass("android/media/MediaScanner");
if (clazz == NULL) {
jniThrowException(env, "java/lang/RuntimeException", "Can't find android/media/MediaScanner");
return;
}
fields.context = env->GetFieldID(clazz, "mNativeContext", "I");
if (fields.context == NULL) {
jniThrowException(env, "java/lang/RuntimeException", "Can't find MediaScanner.mNativeContext");
return;
}
}
static void
android_media_MediaScanner_native_setup(JNIEnv *env, jobject thiz)
{
MediaScanner *mp = new MediaScanner();
if (mp == NULL) {
jniThrowException(env, "java/lang/RuntimeException", "Out of memory");
return;
}
env->SetIntField(thiz, fields.context, (int)mp);
}
static void
android_media_MediaScanner_native_finalize(JNIEnv *env, jobject thiz)
{
MediaScanner *mp = (MediaScanner *)env->GetIntField(thiz, fields.context);
//printf("##### android_media_MediaScanner_native_finalize: ctx=0x%p\n", ctx);
if (mp == 0)
return;
delete mp;
}
// ----------------------------------------------------------------------------
static JNINativeMethod gMethods[] = {
{"processDirectory", "(Ljava/lang/String;Ljava/lang/String;Landroid/media/MediaScannerClient;)V",
(void *)android_media_MediaScanner_processDirectory},
{"processFile", "(Ljava/lang/String;Ljava/lang/String;Landroid/media/MediaScannerClient;)V",
(void *)android_media_MediaScanner_processFile},
{"setLocale", "(Ljava/lang/String;)V", (void *)android_media_MediaScanner_setLocale},
{"extractAlbumArt", "(Ljava/io/FileDescriptor;)[B", (void *)android_media_MediaScanner_extractAlbumArt},
{"native_init", "()V", (void *)android_media_MediaScanner_native_init},
{"native_setup", "()V", (void *)android_media_MediaScanner_native_setup},
{"native_finalize", "()V", (void *)android_media_MediaScanner_native_finalize},
};
static const char* const kClassPathName = "android/media/MediaScanner";
// This function only registers the native methods, and is called from
// JNI_OnLoad in android_media_MediaPlayer.cpp
int register_android_media_MediaScanner(JNIEnv *env)
{
return AndroidRuntime::registerNativeMethods(env,
"android/media/MediaScanner", gMethods, NELEM(gMethods));
}