libavcodec/jni.c

   1 /*
   2  * JNI public API functions
   3  *
   4  * Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26
  27 #include "libavutil/error.h"
  28 #include "jni.h"
  29
  30 #if CONFIG_JNI
  31 #include <jni.h>
  32 #include <pthread.h>
  33
  34 #include "libavutil/log.h"
  35 #include "ffjni.h"
  36
  37 static void *java_vm;
  38 static void *android_app_ctx;
  39 static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
  40
  41 int av_jni_set_java_vm(void *vm, void *log_ctx)
  42 {
  43     int ret = 0;
  44
  45     pthread_mutex_lock(&lock);
  46     if (java_vm == NULL) {
  47         java_vm = vm;
  48     } else if (java_vm != vm) {
  49         ret = AVERROR(EINVAL);
  50         av_log(log_ctx, AV_LOG_ERROR, "A Java virtual machine has already been set");
  51     }
  52     pthread_mutex_unlock(&lock);
  53
  54     return ret;
  55 }
  56
  57 void *av_jni_get_java_vm(void *log_ctx)
  58 {
  59     void *vm;
  60
  61     pthread_mutex_lock(&lock);
  62     vm = java_vm;
  63     pthread_mutex_unlock(&lock);
  64
  65     return vm;
  66 }
  67
  68 #else
  69
  70 int av_jni_set_java_vm(void *vm, void *log_ctx)
  71 {
  72     return AVERROR(ENOSYS);
  73 }
  74
  75 void *av_jni_get_java_vm(void *log_ctx)
  76 {
  77     return NULL;
  78 }
  79
  80 #endif
  81
  82 #if defined(__ANDROID__)
  83
  84 int av_jni_set_android_app_ctx(void *app_ctx, void *log_ctx)
  85 {
  86 #if CONFIG_JNI
  87     jobjectRefType type;
  88
  89     JNIEnv *env = ff_jni_get_env(log_ctx);
  90     if (!env)
  91         return AVERROR(EINVAL);
  92
  93     type = (*env)->GetObjectRefType(env, app_ctx);
  94     if (type != JNIGlobalRefType) {
  95         av_log(log_ctx, AV_LOG_ERROR, "Application context must be passed as a global reference");
  96         return AVERROR(EINVAL);
  97     }
  98
  99     pthread_mutex_lock(&lock);
 100     android_app_ctx = app_ctx;
 101     pthread_mutex_unlock(&lock);
 102
 103     return 0;
 104 #else
 105     return AVERROR(ENOSYS);
 106 #endif
 107 }
 108
 109 void *av_jni_get_android_app_ctx(void)
 110 {
 111 #if CONFIG_JNI
 112     void *ctx;
 113
 114     pthread_mutex_lock(&lock);
 115     ctx = android_app_ctx;
 116     pthread_mutex_unlock(&lock);
 117
 118     return ctx;
 119 #else
 120     return NULL;
 121 #endif
 122 }
 123
 124 #endif