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-rw-r--r--misc/jni.c429
1 files changed, 429 insertions, 0 deletions
diff --git a/misc/jni.c b/misc/jni.c
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index 0000000..82f6356
--- /dev/null
+++ b/misc/jni.c
@@ -0,0 +1,429 @@
+/*
+ * JNI utility functions
+ *
+ * Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
+ *
+ * This file is part of mpv.
+ *
+ * mpv 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.
+ *
+ * mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libavcodec/jni.h>
+#include <libavutil/mem.h>
+#include <libavutil/bprint.h>
+#include <stdlib.h>
+
+#include "jni.h"
+#include "osdep/threads.h"
+
+static JavaVM *java_vm;
+static pthread_key_t current_env;
+static mp_once once = MP_STATIC_ONCE_INITIALIZER;
+static mp_static_mutex lock = MP_STATIC_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(&current_env, jni_detach_env);
+}
+
+JNIEnv *mp_jni_get_env(struct mp_log *log)
+{
+ int ret = 0;
+ JNIEnv *env = NULL;
+
+ mp_mutex_lock(&lock);
+ if (java_vm == NULL) {
+ java_vm = av_jni_get_java_vm(NULL);
+ }
+
+ if (!java_vm) {
+ mp_err(log, "No Java virtual machine has been registered\n");
+ goto done;
+ }
+
+ mp_exec_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) {
+ mp_err(log, "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:
+ mp_err(log, "The specified JNI version is not supported\n");
+ break;
+ default:
+ mp_err(log, "Failed to get the JNI environment attached to this thread\n");
+ break;
+ }
+
+done:
+ mp_mutex_unlock(&lock);
+ return env;
+}
+
+char *mp_jni_jstring_to_utf_chars(JNIEnv *env, jstring string, struct mp_log *log)
+{
+ char *ret = NULL;
+ const char *utf_chars = NULL;
+
+ jboolean copy = 0;
+
+ if (!string) {
+ return NULL;
+ }
+
+ utf_chars = (*env)->GetStringUTFChars(env, string, &copy);
+ if ((*env)->ExceptionCheck(env)) {
+ (*env)->ExceptionClear(env);
+ mp_err(log, "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);
+ mp_err(log, "String.releaseStringUTFChars() threw an exception\n");
+ return NULL;
+ }
+
+ return ret;
+}
+
+jstring mp_jni_utf_chars_to_jstring(JNIEnv *env, const char *utf_chars, struct mp_log *log)
+{
+ jstring ret;
+
+ ret = (*env)->NewStringUTF(env, utf_chars);
+ if ((*env)->ExceptionCheck(env)) {
+ (*env)->ExceptionClear(env);
+ mp_err(log, "NewStringUTF() threw an exception\n");
+ return NULL;
+ }
+
+ return ret;
+}
+
+int mp_jni_exception_get_summary(JNIEnv *env, jthrowable exception, char **error, struct mp_log *log)
+{
+ 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);
+ mp_err(log, "Could not find Throwable class\n");
+ ret = -1;
+ goto done;
+ }
+
+ class_class = (*env)->GetObjectClass(env, exception_class);
+ if ((*env)->ExceptionCheck(env)) {
+ (*env)->ExceptionClear(env);
+ mp_err(log, "Could not find Throwable class's class\n");
+ ret = -1;
+ goto done;
+ }
+
+ get_name_id = (*env)->GetMethodID(env, class_class, "getName", "()Ljava/lang/String;");
+ if ((*env)->ExceptionCheck(env)) {
+ (*env)->ExceptionClear(env);
+ mp_err(log, "Could not find method Class.getName()\n");
+ ret = -1;
+ goto done;
+ }
+
+ string = (*env)->CallObjectMethod(env, exception_class, get_name_id);
+ if ((*env)->ExceptionCheck(env)) {
+ (*env)->ExceptionClear(env);
+ mp_err(log, "Class.getName() threw an exception\n");
+ ret = -1;
+ goto done;
+ }
+
+ if (string) {
+ name = mp_jni_jstring_to_utf_chars(env, string, log);
+ (*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);
+ mp_err(log, "Could not find method java/lang/Throwable.getMessage()\n");
+ ret = -1;
+ goto done;
+ }
+
+ string = (*env)->CallObjectMethod(env, exception, get_message_id);
+ if ((*env)->ExceptionCheck(env)) {
+ (*env)->ExceptionClear(env);
+ mp_err(log, "Throwable.getMessage() threw an exception\n");
+ ret = -1;
+ goto done;
+ }
+
+ if (string) {
+ message = mp_jni_jstring_to_utf_chars(env, string, log);
+ (*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 {
+ mp_warn(log, "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 mp_jni_exception_check(JNIEnv *env, int logging, struct mp_log *log)
+{
+ int ret;
+
+ jthrowable exception;
+
+ char *message = NULL;
+
+ if (!(*(env))->ExceptionCheck((env))) {
+ return 0;
+ }
+
+ if (!logging) {
+ (*(env))->ExceptionClear((env));
+ return -1;
+ }
+
+ exception = (*env)->ExceptionOccurred(env);
+ (*(env))->ExceptionClear((env));
+
+ if ((ret = mp_jni_exception_get_summary(env, exception, &message, log)) < 0) {
+ (*env)->DeleteLocalRef(env, exception);
+ return ret;
+ }
+
+ (*env)->DeleteLocalRef(env, exception);
+
+ mp_err(log, "%s\n", message);
+ av_free(message);
+
+ return -1;
+}
+
+int mp_jni_init_jfields(JNIEnv *env, void *jfields, const struct MPJniField *jfields_mapping, int global, struct mp_log *log)
+{
+ int i, ret = 0;
+ jclass last_clazz = NULL;
+
+ for (i = 0; jfields_mapping[i].name; i++) {
+ int mandatory = jfields_mapping[i].mandatory;
+ enum MPJniFieldType type = jfields_mapping[i].type;
+
+ if (type == MP_JNI_CLASS) {
+ jclass clazz;
+
+ last_clazz = NULL;
+
+ clazz = (*env)->FindClass(env, jfields_mapping[i].name);
+ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 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 = -1;
+ break;
+ }
+
+ switch(type) {
+ case MP_JNI_FIELD: {
+ jfieldID field_id = (*env)->GetFieldID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
+ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
+ goto done;
+ }
+
+ *(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = field_id;
+ break;
+ }
+ case MP_JNI_STATIC_FIELD_AS_INT:
+ case MP_JNI_STATIC_FIELD: {
+ jfieldID field_id = (*env)->GetStaticFieldID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
+ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
+ goto done;
+ }
+
+ if (type == MP_JNI_STATIC_FIELD_AS_INT) {
+ if (field_id) {
+ jint value = (*env)->GetStaticIntField(env, last_clazz, field_id);
+ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
+ goto done;
+ }
+ *(jint*)((uint8_t*)jfields + jfields_mapping[i].offset) = value;
+ }
+ } else {
+ *(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = field_id;
+ }
+ break;
+ }
+ case MP_JNI_METHOD: {
+ jmethodID method_id = (*env)->GetMethodID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
+ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
+ goto done;
+ }
+
+ *(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = method_id;
+ break;
+ }
+ case MP_JNI_STATIC_METHOD: {
+ jmethodID method_id = (*env)->GetStaticMethodID(env, last_clazz, jfields_mapping[i].method, jfields_mapping[i].signature);
+ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && mandatory) {
+ goto done;
+ }
+
+ *(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = method_id;
+ break;
+ }
+ default:
+ mp_err(log, "Unknown JNI field type\n");
+ ret = -1;
+ goto done;
+ }
+
+ ret = 0;
+ }
+ }
+
+done:
+ if (ret < 0) {
+ /* reset jfields in case of failure so it does not leak references */
+ mp_jni_reset_jfields(env, jfields, jfields_mapping, global, log);
+ }
+
+ return ret;
+}
+
+int mp_jni_reset_jfields(JNIEnv *env, void *jfields, const struct MPJniField *jfields_mapping, int global, struct mp_log *log)
+{
+ int i;
+
+ for (i = 0; jfields_mapping[i].name; i++) {
+ enum MPJniFieldType type = jfields_mapping[i].type;
+
+ switch(type) {
+ case MP_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 MP_JNI_FIELD: {
+ *(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
+ break;
+ }
+ case MP_JNI_STATIC_FIELD: {
+ *(jfieldID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
+ break;
+ }
+ case MP_JNI_STATIC_FIELD_AS_INT: {
+ *(jint*)((uint8_t*)jfields + jfields_mapping[i].offset) = 0;
+ break;
+ }
+ case MP_JNI_METHOD: {
+ *(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
+ break;
+ }
+ case MP_JNI_STATIC_METHOD: {
+ *(jmethodID*)((uint8_t*)jfields + jfields_mapping[i].offset) = NULL;
+ break;
+ }
+ default:
+ mp_err(log, "Unknown JNI field type\n");
+ }
+ }
+
+ return 0;
+}
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