419 lines
12 KiB
C
419 lines
12 KiB
C
/*
|
|
* JNI utility functions
|
|
*
|
|
* Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <jni.h>
|
|
#include <pthread.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "libavutil/bprint.h"
|
|
#include "libavutil/log.h"
|
|
|
|
#include "config.h"
|
|
#include "jni.h"
|
|
#include "ffjni.h"
|
|
|
|
static JavaVM *java_vm;
|
|
static pthread_key_t current_env;
|
|
static pthread_once_t once = PTHREAD_ONCE_INIT;
|
|
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
|
|
|
|
static void jni_detach_env(void *data)
|
|
{
|
|
if (java_vm) {
|
|
(*java_vm)->DetachCurrentThread(java_vm);
|
|
}
|
|
}
|
|
|
|
static void jni_create_pthread_key(void)
|
|
{
|
|
pthread_key_create(¤t_env, jni_detach_env);
|
|
}
|
|
|
|
JNIEnv *ff_jni_get_env(void *log_ctx)
|
|
{
|
|
int ret = 0;
|
|
JNIEnv *env = NULL;
|
|
|
|
pthread_mutex_lock(&lock);
|
|
if (java_vm == NULL) {
|
|
java_vm = av_jni_get_java_vm(log_ctx);
|
|
}
|
|
|
|
if (!java_vm) {
|
|
av_log(log_ctx, AV_LOG_ERROR, "No Java virtual machine has been registered\n");
|
|
goto done;
|
|
}
|
|
|
|
pthread_once(&once, jni_create_pthread_key);
|
|
|
|
if ((env = pthread_getspecific(current_env)) != NULL) {
|
|
goto done;
|
|
}
|
|
|
|
ret = (*java_vm)->GetEnv(java_vm, (void **)&env, JNI_VERSION_1_6);
|
|
switch(ret) {
|
|
case JNI_EDETACHED:
|
|
if ((*java_vm)->AttachCurrentThread(java_vm, &env, NULL) != 0) {
|
|
av_log(log_ctx, AV_LOG_ERROR, "Failed to attach the JNI environment to the current thread\n");
|
|
env = NULL;
|
|
} else {
|
|
pthread_setspecific(current_env, env);
|
|
}
|
|
break;
|
|
case JNI_OK:
|
|
break;
|
|
case JNI_EVERSION:
|
|
av_log(log_ctx, AV_LOG_ERROR, "The specified JNI version is not supported\n");
|
|
break;
|
|
default:
|
|
av_log(log_ctx, AV_LOG_ERROR, "Failed to get the JNI environment attached to this thread\n");
|
|
break;
|
|
}
|
|
|
|
done:
|
|
pthread_mutex_unlock(&lock);
|
|
return env;
|
|
}
|
|
|
|
char *ff_jni_jstring_to_utf_chars(JNIEnv *env, jstring string, void *log_ctx)
|
|
{
|
|
char *ret = NULL;
|
|
const char *utf_chars = NULL;
|
|
|
|
jboolean copy = 0;
|
|
|
|
if (!string) {
|
|
return NULL;
|
|
}
|
|
|
|
utf_chars = (*env)->GetStringUTFChars(env, string, ©);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "String.getStringUTFChars() threw an exception\n");
|
|
return NULL;
|
|
}
|
|
|
|
ret = av_strdup(utf_chars);
|
|
|
|
(*env)->ReleaseStringUTFChars(env, string, utf_chars);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "String.releaseStringUTFChars() threw an exception\n");
|
|
return NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
jstring ff_jni_utf_chars_to_jstring(JNIEnv *env, const char *utf_chars, void *log_ctx)
|
|
{
|
|
jstring ret;
|
|
|
|
ret = (*env)->NewStringUTF(env, utf_chars);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "NewStringUTF() threw an exception\n");
|
|
return NULL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ff_jni_exception_get_summary(JNIEnv *env, jthrowable exception, char **error, void *log_ctx)
|
|
{
|
|
int ret = 0;
|
|
|
|
AVBPrint bp;
|
|
|
|
char *name = NULL;
|
|
char *message = NULL;
|
|
|
|
jclass class_class = NULL;
|
|
jmethodID get_name_id = NULL;
|
|
|
|
jclass exception_class = NULL;
|
|
jmethodID get_message_id = NULL;
|
|
|
|
jstring string = NULL;
|
|
|
|
av_bprint_init(&bp, 0, AV_BPRINT_SIZE_AUTOMATIC);
|
|
|
|
exception_class = (*env)->GetObjectClass(env, exception);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "Could not find Throwable class\n");
|
|
ret = AVERROR_EXTERNAL;
|
|
goto done;
|
|
}
|
|
|
|
class_class = (*env)->GetObjectClass(env, exception_class);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "Could not find Throwable class's class\n");
|
|
ret = AVERROR_EXTERNAL;
|
|
goto done;
|
|
}
|
|
|
|
get_name_id = (*env)->GetMethodID(env, class_class, "getName", "()Ljava/lang/String;");
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "Could not find method Class.getName()\n");
|
|
ret = AVERROR_EXTERNAL;
|
|
goto done;
|
|
}
|
|
|
|
string = (*env)->CallObjectMethod(env, exception_class, get_name_id);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "Class.getName() threw an exception\n");
|
|
ret = AVERROR_EXTERNAL;
|
|
goto done;
|
|
}
|
|
|
|
if (string) {
|
|
name = ff_jni_jstring_to_utf_chars(env, string, log_ctx);
|
|
(*env)->DeleteLocalRef(env, string);
|
|
string = NULL;
|
|
}
|
|
|
|
get_message_id = (*env)->GetMethodID(env, exception_class, "getMessage", "()Ljava/lang/String;");
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "Could not find method java/lang/Throwable.getMessage()\n");
|
|
ret = AVERROR_EXTERNAL;
|
|
goto done;
|
|
}
|
|
|
|
string = (*env)->CallObjectMethod(env, exception, get_message_id);
|
|
if ((*env)->ExceptionCheck(env)) {
|
|
(*env)->ExceptionClear(env);
|
|
av_log(log_ctx, AV_LOG_ERROR, "Throwable.getMessage() threw an exception\n");
|
|
ret = AVERROR_EXTERNAL;
|
|
goto done;
|
|
}
|
|
|
|
if (string) {
|
|
message = ff_jni_jstring_to_utf_chars(env, string, log_ctx);
|
|
(*env)->DeleteLocalRef(env, string);
|
|
string = NULL;
|
|
}
|
|
|
|
if (name && message) {
|
|
av_bprintf(&bp, "%s: %s", name, message);
|
|
} else if (name && !message) {
|
|
av_bprintf(&bp, "%s occurred", name);
|
|
} else if (!name && message) {
|
|
av_bprintf(&bp, "Exception: %s", message);
|
|
} else {
|
|
av_log(log_ctx, AV_LOG_WARNING, "Could not retrieve exception name and message\n");
|
|
av_bprintf(&bp, "Exception occurred");
|
|
}
|
|
|
|
ret = av_bprint_finalize(&bp, error);
|
|
done:
|
|
|
|
av_free(name);
|
|
av_free(message);
|
|
|
|
if (class_class) {
|
|
(*env)->DeleteLocalRef(env, class_class);
|
|
}
|
|
|
|
if (exception_class) {
|
|
(*env)->DeleteLocalRef(env, exception_class);
|
|
}
|
|
|
|
if (string) {
|
|
(*env)->DeleteLocalRef(env, string);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ff_jni_exception_check(JNIEnv *env, int log, void *log_ctx)
|
|
{
|
|
int ret;
|
|
|
|
jthrowable exception;
|
|
|
|
char *message = NULL;
|
|
|
|
if (!(*(env))->ExceptionCheck((env))) {
|
|
return 0;
|
|
}
|
|
|
|
if (!log) {
|
|
(*(env))->ExceptionClear((env));
|
|
return -1;
|
|
}
|
|
|
|
exception = (*env)->ExceptionOccurred(env);
|
|
(*(env))->ExceptionClear((env));
|
|
|
|
if ((ret = ff_jni_exception_get_summary(env, exception, &message, log_ctx)) < 0) {
|
|
(*env)->DeleteLocalRef(env, exception);
|
|
return ret;
|
|
}
|
|
|
|
(*env)->DeleteLocalRef(env, exception);
|
|
|
|
av_log(log_ctx, AV_LOG_ERROR, "%s\n", message);
|
|
av_free(message);
|
|
|
|
return -1;
|
|
}
|
|
|
|
int ff_jni_init_jfields(JNIEnv *env, void *jfields, const struct FFJniField *jfields_mapping, int global, void *log_ctx)
|
|
{
|
|
int i, ret = 0;
|
|
jclass last_clazz = NULL;
|
|
|
|
for (i = 0; jfields_mapping[i].name; i++) {
|
|
int mandatory = jfields_mapping[i].mandatory;
|
|
enum FFJniFieldType type = jfields_mapping[i].type;
|
|
|
|
if (type == FF_JNI_CLASS) {
|
|
jclass clazz;
|
|
|
|
last_clazz = NULL;
|
|
|
|
clazz = (*env)->FindClass(env, jfields_mapping[i].name);
|
|
if ((ret = ff_jni_exception_check(env, mandatory, log_ctx)) < 0 && mandatory) {
|
|
goto done;
|
|
}
|
|
|
|
last_clazz = *(jclass*)((uint8_t*)jfields + jfields_mapping[i].offset) =
|
|
global ? (*env)->NewGlobalRef(env, clazz) : clazz;
|
|
|
|
if (global) {
|
|
(*env)->DeleteLocalRef(env, clazz);
|
|
}
|
|
|
|
} else {
|
|
|
|
if (!last_clazz) {
|
|
ret = AVERROR_EXTERNAL;
|
|
break;
|
|
}
|
|
|
|
switch(type) {
|
|
case FF_JNI_FIELD: {
|
|
jfieldID field_id = (*env)->GetFieldID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
|
|
if ((ret = ff_jni_exception_check(env, mandatory, log_ctx)) < 0 && mandatory) {
|
|
goto done;
|
|
}
|
|
|
|
*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = field_id;
|
|
break;
|
|
}
|
|
case FF_JNI_STATIC_FIELD: {
|
|
jfieldID field_id = (*env)->GetStaticFieldID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
|
|
if ((ret = ff_jni_exception_check(env, mandatory, log_ctx)) < 0 && mandatory) {
|
|
goto done;
|
|
}
|
|
|
|
*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = field_id;
|
|
break;
|
|
}
|
|
case FF_JNI_METHOD: {
|
|
jmethodID method_id = (*env)->GetMethodID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
|
|
if ((ret = ff_jni_exception_check(env, mandatory, log_ctx)) < 0 && mandatory) {
|
|
goto done;
|
|
}
|
|
|
|
*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = method_id;
|
|
break;
|
|
}
|
|
case FF_JNI_STATIC_METHOD: {
|
|
jmethodID method_id = (*env)->GetStaticMethodID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
|
|
if ((ret = ff_jni_exception_check(env, mandatory, log_ctx)) < 0 && mandatory) {
|
|
goto done;
|
|
}
|
|
|
|
*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = method_id;
|
|
break;
|
|
}
|
|
default:
|
|
av_log(log_ctx, AV_LOG_ERROR, "Unknown JNI field type\n");
|
|
ret = AVERROR(EINVAL);
|
|
goto done;
|
|
}
|
|
|
|
ret = 0;
|
|
}
|
|
}
|
|
|
|
done:
|
|
if (ret < 0) {
|
|
/* reset jfields in case of failure so it does not leak references */
|
|
ff_jni_reset_jfields(env, jfields, jfields_mapping, global, log_ctx);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ff_jni_reset_jfields(JNIEnv *env, void *jfields, const struct FFJniField *jfields_mapping, int global, void *log_ctx)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; jfields_mapping[i].name; i++) {
|
|
enum FFJniFieldType type = jfields_mapping[i].type;
|
|
|
|
switch(type) {
|
|
case FF_JNI_CLASS: {
|
|
jclass clazz = *(jclass*)((uint8_t*)jfields + jfields_mapping[i].offset);
|
|
if (!clazz)
|
|
continue;
|
|
|
|
if (global) {
|
|
(*env)->DeleteGlobalRef(env, clazz);
|
|
} else {
|
|
(*env)->DeleteLocalRef(env, clazz);
|
|
}
|
|
|
|
*(jclass*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
|
|
break;
|
|
}
|
|
case FF_JNI_FIELD: {
|
|
*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
|
|
break;
|
|
}
|
|
case FF_JNI_STATIC_FIELD: {
|
|
*(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
|
|
break;
|
|
}
|
|
case FF_JNI_METHOD: {
|
|
*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
|
|
break;
|
|
}
|
|
case FF_JNI_STATIC_METHOD: {
|
|
*(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
|
|
break;
|
|
}
|
|
default:
|
|
av_log(log_ctx, AV_LOG_ERROR, "Unknown JNI field type\n");
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|