mirror of
https://github.com/mpv-player/mpv
synced 2024-12-29 10:32:15 +00:00
430 lines
12 KiB
C
430 lines
12 KiB
C
/*
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* JNI utility functions
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*
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* Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libavcodec/jni.h>
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#include <libavutil/mem.h>
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#include <libavutil/bprint.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include "jni.h"
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static JavaVM *java_vm;
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static pthread_key_t current_env;
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static pthread_once_t once = PTHREAD_ONCE_INIT;
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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static void jni_detach_env(void *data)
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{
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if (java_vm) {
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(*java_vm)->DetachCurrentThread(java_vm);
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}
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}
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static void jni_create_pthread_key(void)
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{
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pthread_key_create(¤t_env, jni_detach_env);
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}
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JNIEnv *mp_jni_get_env(struct mp_log *log)
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{
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int ret = 0;
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JNIEnv *env = NULL;
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pthread_mutex_lock(&lock);
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if (java_vm == NULL) {
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java_vm = av_jni_get_java_vm(NULL);
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}
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if (!java_vm) {
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mp_err(log, "No Java virtual machine has been registered\n");
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goto done;
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}
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pthread_once(&once, jni_create_pthread_key);
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if ((env = pthread_getspecific(current_env)) != NULL) {
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goto done;
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}
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ret = (*java_vm)->GetEnv(java_vm, (void **)&env, JNI_VERSION_1_6);
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switch(ret) {
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case JNI_EDETACHED:
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if ((*java_vm)->AttachCurrentThread(java_vm, &env, NULL) != 0) {
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mp_err(log, "Failed to attach the JNI environment to the current thread\n");
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env = NULL;
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} else {
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pthread_setspecific(current_env, env);
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}
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break;
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case JNI_OK:
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break;
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case JNI_EVERSION:
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mp_err(log, "The specified JNI version is not supported\n");
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break;
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default:
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mp_err(log, "Failed to get the JNI environment attached to this thread\n");
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break;
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}
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done:
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pthread_mutex_unlock(&lock);
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return env;
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}
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char *mp_jni_jstring_to_utf_chars(JNIEnv *env, jstring string, struct mp_log *log)
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{
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char *ret = NULL;
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const char *utf_chars = NULL;
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jboolean copy = 0;
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if (!string) {
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return NULL;
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}
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utf_chars = (*env)->GetStringUTFChars(env, string, ©);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "String.getStringUTFChars() threw an exception\n");
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return NULL;
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}
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ret = av_strdup(utf_chars);
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(*env)->ReleaseStringUTFChars(env, string, utf_chars);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "String.releaseStringUTFChars() threw an exception\n");
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return NULL;
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}
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return ret;
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}
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jstring mp_jni_utf_chars_to_jstring(JNIEnv *env, const char *utf_chars, struct mp_log *log)
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{
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jstring ret;
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ret = (*env)->NewStringUTF(env, utf_chars);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "NewStringUTF() threw an exception\n");
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return NULL;
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}
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return ret;
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}
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int mp_jni_exception_get_summary(JNIEnv *env, jthrowable exception, char **error, struct mp_log *log)
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{
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int ret = 0;
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AVBPrint bp;
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char *name = NULL;
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char *message = NULL;
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jclass class_class = NULL;
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jmethodID get_name_id = NULL;
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jclass exception_class = NULL;
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jmethodID get_message_id = NULL;
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jstring string = NULL;
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av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
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exception_class = (*env)->GetObjectClass(env, exception);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "Could not find Throwable class\n");
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ret = -1;
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goto done;
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}
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class_class = (*env)->GetObjectClass(env, exception_class);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "Could not find Throwable class's class\n");
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ret = -1;
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goto done;
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}
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get_name_id = (*env)->GetMethodID(env, class_class, "getName", "()Ljava/lang/String;");
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "Could not find method Class.getName()\n");
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ret = -1;
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goto done;
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}
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string = (*env)->CallObjectMethod(env, exception_class, get_name_id);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "Class.getName() threw an exception\n");
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ret = -1;
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goto done;
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}
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if (string) {
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name = mp_jni_jstring_to_utf_chars(env, string, log);
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(*env)->DeleteLocalRef(env, string);
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string = NULL;
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}
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get_message_id = (*env)->GetMethodID(env, exception_class, "getMessage", "()Ljava/lang/String;");
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "Could not find method java/lang/Throwable.getMessage()\n");
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ret = -1;
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goto done;
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}
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string = (*env)->CallObjectMethod(env, exception, get_message_id);
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if ((*env)->ExceptionCheck(env)) {
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(*env)->ExceptionClear(env);
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mp_err(log, "Throwable.getMessage() threw an exception\n");
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ret = -1;
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goto done;
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}
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if (string) {
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message = mp_jni_jstring_to_utf_chars(env, string, log);
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(*env)->DeleteLocalRef(env, string);
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string = NULL;
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}
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if (name && message) {
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av_bprintf(&bp, "%s: %s", name, message);
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} else if (name && !message) {
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av_bprintf(&bp, "%s occurred", name);
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} else if (!name && message) {
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av_bprintf(&bp, "Exception: %s", message);
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} else {
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mp_warn(log, "Could not retrieve exception name and message\n");
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av_bprintf(&bp, "Exception occurred");
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}
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ret = av_bprint_finalize(&bp, error);
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done:
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av_free(name);
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av_free(message);
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if (class_class) {
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(*env)->DeleteLocalRef(env, class_class);
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}
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if (exception_class) {
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(*env)->DeleteLocalRef(env, exception_class);
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}
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if (string) {
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(*env)->DeleteLocalRef(env, string);
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}
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return ret;
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}
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int mp_jni_exception_check(JNIEnv *env, int logging, struct mp_log *log)
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{
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int ret;
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jthrowable exception;
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char *message = NULL;
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if (!(*(env))->ExceptionCheck((env))) {
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return 0;
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}
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if (!logging) {
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(*(env))->ExceptionClear((env));
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return -1;
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}
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exception = (*env)->ExceptionOccurred(env);
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(*(env))->ExceptionClear((env));
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if ((ret = mp_jni_exception_get_summary(env, exception, &message, log)) < 0) {
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(*env)->DeleteLocalRef(env, exception);
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return ret;
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}
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(*env)->DeleteLocalRef(env, exception);
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mp_err(log, "%s\n", message);
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av_free(message);
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return -1;
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}
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int mp_jni_init_jfields(JNIEnv *env, void *jfields, const struct MPJniField *jfields_mapping, int global, struct mp_log *log)
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{
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int i, ret = 0;
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jclass last_clazz = NULL;
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for (i = 0; jfields_mapping[i].name; i++) {
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int mandatory = jfields_mapping[i].mandatory;
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enum MPJniFieldType type = jfields_mapping[i].type;
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if (type == MP_JNI_CLASS) {
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jclass clazz;
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last_clazz = NULL;
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clazz = (*env)->FindClass(env, jfields_mapping[i].name);
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if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
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goto done;
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}
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last_clazz = *(jclass*)((uint8_t*)jfields + jfields_mapping[i].offset) =
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global ? (*env)->NewGlobalRef(env, clazz) : clazz;
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if (global) {
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(*env)->DeleteLocalRef(env, clazz);
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}
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} else {
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if (!last_clazz) {
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ret = -1;
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break;
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}
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switch(type) {
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case MP_JNI_FIELD: {
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jfieldID field_id = (*env)->GetFieldID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
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if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
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goto done;
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}
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*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = field_id;
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break;
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}
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case MP_JNI_STATIC_FIELD_AS_INT:
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case MP_JNI_STATIC_FIELD: {
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jfieldID field_id = (*env)->GetStaticFieldID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
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if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
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goto done;
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}
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if (type == MP_JNI_STATIC_FIELD_AS_INT) {
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if (field_id) {
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jint value = (*env)->GetStaticIntField(env, last_clazz, field_id);
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if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
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goto done;
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}
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*(jint*)((uint8_t*)jfields + jfields_mapping[i].offset) = value;
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}
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} else {
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*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = field_id;
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}
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break;
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}
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case MP_JNI_METHOD: {
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jmethodID method_id = (*env)->GetMethodID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
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if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
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goto done;
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}
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*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = method_id;
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break;
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}
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case MP_JNI_STATIC_METHOD: {
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jmethodID method_id = (*env)->GetStaticMethodID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
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if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
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goto done;
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}
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*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = method_id;
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break;
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}
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default:
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mp_err(log, "Unknown JNI field type\n");
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ret = -1;
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goto done;
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}
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ret = 0;
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}
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}
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done:
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if (ret < 0) {
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/* reset jfields in case of failure so it does not leak references */
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mp_jni_reset_jfields(env, jfields, jfields_mapping, global, log);
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}
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return ret;
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}
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int mp_jni_reset_jfields(JNIEnv *env, void *jfields, const struct MPJniField *jfields_mapping, int global, struct mp_log *log)
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{
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int i;
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for (i = 0; jfields_mapping[i].name; i++) {
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enum MPJniFieldType type = jfields_mapping[i].type;
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switch(type) {
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case MP_JNI_CLASS: {
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jclass clazz = *(jclass*)((uint8_t*)jfields + jfields_mapping[i].offset);
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if (!clazz)
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continue;
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if (global) {
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(*env)->DeleteGlobalRef(env, clazz);
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} else {
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(*env)->DeleteLocalRef(env, clazz);
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}
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*(jclass*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
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break;
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}
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case MP_JNI_FIELD: {
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*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
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break;
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}
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case MP_JNI_STATIC_FIELD: {
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*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
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break;
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}
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case MP_JNI_STATIC_FIELD_AS_INT: {
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*(jint*)((uint8_t*)jfields + jfields_mapping[i].offset) = 0;
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break;
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}
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case MP_JNI_METHOD: {
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*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
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break;
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}
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case MP_JNI_STATIC_METHOD: {
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*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
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break;
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}
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default:
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mp_err(log, "Unknown JNI field type\n");
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}
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}
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return 0;
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}
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