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C
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#include <libavcodec/jni.h>#include <stdlib.h>
#include "jni.h"#include "mpv_talloc.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(¤t_env, jni_detach_env);}
JNIEnv *mp_jni_get_env(struct mp_log *log){ JNIEnv *env = NULL;
mp_mutex_lock(&lock); if (!java_vm) 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;
int 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){ if (!string) return NULL;
const char *utf_chars = (*env)->GetStringUTFChars(env, string, NULL); if ((*env)->ExceptionCheck(env)) { (*env)->ExceptionClear(env); mp_err(log, "getStringUTFChars() threw an exception\n"); return NULL; }
char *ret = talloc_strdup(NULL, utf_chars);
(*env)->ReleaseStringUTFChars(env, string, utf_chars);
return ret;}
jstring mp_jni_utf_chars_to_jstring(JNIEnv *env, const char *utf_chars, struct mp_log *log){ jstring 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;
char *name = NULL; char *message = NULL;
jclass class_class = NULL; jclass exception_class = NULL; jstring string = NULL;
*error = NULL;
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; }
jmethodID 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); MP_JNI_LOCAL_FREEP(&string); }
jmethodID 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 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); MP_JNI_LOCAL_FREEP(&string); }
if (name && message) { *error = talloc_asprintf(NULL, "%s: %s", name, message); } else if (name && !message) { *error = talloc_asprintf(NULL, "%s occurred", name); } else if (!name && message) { *error = talloc_asprintf(NULL, "Exception: %s", message); } else { mp_warn(log, "Could not retrieve exception name and message\n"); *error = talloc_strdup(NULL, "Exception occurred"); }
done:
talloc_free(name); talloc_free(message);
MP_JNI_LOCAL_FREEP(&class_class); MP_JNI_LOCAL_FREEP(&exception_class); MP_JNI_LOCAL_FREEP(&string);
return ret;}
int mp_jni_exception_check(JNIEnv *env, int logging, struct mp_log *log){ if (!(*env)->ExceptionCheck(env)) return 0;
if (!logging) { (*env)->ExceptionClear(env); return -1; }
jthrowable exception = (*env)->ExceptionOccurred(env); (*env)->ExceptionClear(env);
char *message = NULL; int ret = mp_jni_exception_get_summary(env, exception, &message, log); MP_JNI_LOCAL_FREEP(&exception); if (ret < 0) return ret;
mp_err(log, "%s\n", message); talloc_free(message); return -1;}
#define CHECK_EXC_MANDATORY() do { \ if ((ret = mp_jni_exception_check(env, mandatory, log)) < 0 && \ mandatory) { \ goto done; \ } \ } while (0)
int mp_jni_init_jfields(JNIEnv *env, void *jfields, const struct MPJniField *jfields_mapping, int global, struct mp_log *log){ int ret = 0; jclass last_clazz = NULL;
for (int i = 0; jfields_mapping[i].name; i++) { bool mandatory = !!jfields_mapping[i].mandatory; enum MPJniFieldType type = jfields_mapping[i].type;
void *jfield = (uint8_t*)jfields + jfields_mapping[i].offset;
if (type == MP_JNI_CLASS) { last_clazz = NULL;
jclass clazz = (*env)->FindClass(env, jfields_mapping[i].name); CHECK_EXC_MANDATORY();
last_clazz = *(jclass*)jfield = global ? (*env)->NewGlobalRef(env, clazz) : clazz;
if (global) MP_JNI_LOCAL_FREEP(&clazz);
continue; }
if (!last_clazz) { ret = -1; break; }
switch (type) { case MP_JNI_FIELD: { jfieldID field_id = (*env)->GetFieldID(env, last_clazz, jfields_mapping[i].name, jfields_mapping[i].signature); CHECK_EXC_MANDATORY();
*(jfieldID*)jfield = 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].name, jfields_mapping[i].signature); CHECK_EXC_MANDATORY();
if (type == MP_JNI_STATIC_FIELD_AS_INT) { if (field_id) { jint value = (*env)->GetStaticIntField(env, last_clazz, field_id); CHECK_EXC_MANDATORY(); *(jint*)jfield = value; } } else { *(jfieldID*)jfield = field_id; } break; } case MP_JNI_METHOD: { jmethodID method_id = (*env)->GetMethodID(env, last_clazz, jfields_mapping[i].name, jfields_mapping[i].signature); CHECK_EXC_MANDATORY();
*(jmethodID*)jfield = method_id; break; } case MP_JNI_STATIC_METHOD: { jmethodID method_id = (*env)->GetStaticMethodID(env, last_clazz, jfields_mapping[i].name, jfields_mapping[i].signature); CHECK_EXC_MANDATORY();
*(jmethodID*)jfield = 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;}
#undef CHECK_EXC_MANDATORY
int mp_jni_reset_jfields(JNIEnv *env, void *jfields, const struct MPJniField *jfields_mapping, int global, struct mp_log *log){ for (int i = 0; jfields_mapping[i].name; i++) { enum MPJniFieldType type = jfields_mapping[i].type;
void *jfield = (uint8_t*)jfields + jfields_mapping[i].offset;
switch (type) { case MP_JNI_CLASS: { jclass clazz = *(jclass*)jfield; if (!clazz) continue;
if (global) { MP_JNI_GLOBAL_FREEP(&clazz); } else { MP_JNI_LOCAL_FREEP(&clazz); }
*(jclass*)jfield = NULL; break; } case MP_JNI_FIELD: case MP_JNI_STATIC_FIELD: *(jfieldID*)jfield = NULL; break; case MP_JNI_STATIC_FIELD_AS_INT: *(jint*)jfield = 0; break; case MP_JNI_METHOD: case MP_JNI_STATIC_METHOD: *(jmethodID*)jfield = NULL; break; default: mp_err(log, "Unknown JNI field type\n"); } }
return 0;}