FFmpeg
jni.c
Go to the documentation of this file.
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 void *java_vm;
39 
40 int av_jni_set_java_vm(void *vm, void *log_ctx)
41 {
42  int ret = 0;
43 
45  if (java_vm == NULL) {
46  java_vm = vm;
47  } else if (java_vm != vm) {
48  ret = AVERROR(EINVAL);
49  av_log(log_ctx, AV_LOG_ERROR, "A Java virtual machine has already been set");
50  }
52 
53  return ret;
54 }
55 
56 void *av_jni_get_java_vm(void *log_ctx)
57 {
58  void *vm;
59 
61  vm = java_vm;
63 
64  return vm;
65 }
66 
67 #else
68 
69 int av_jni_set_java_vm(void *vm, void *log_ctx)
70 {
71  return AVERROR(ENOSYS);
72 }
73 
74 void *av_jni_get_java_vm(void *log_ctx)
75 {
76  return NULL;
77 }
78 
79 #endif
#define NULL
Definition: coverity.c:32
int av_jni_set_java_vm(void *vm, void *log_ctx)
Definition: jni.c:69
#define pthread_mutex_lock(a)
Definition: ffprobe.c:62
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
error code definitions
void * av_jni_get_java_vm(void *log_ctx)
Definition: jni.c:74
#define pthread_mutex_unlock(a)
Definition: ffprobe.c:66
#define PTHREAD_MUTEX_INITIALIZER
Definition: os2threads.h:56
static JavaVM * java_vm
Definition: ffjni.c:34
static pthread_mutex_t lock
Definition: ffjni.c:37
_fmutex pthread_mutex_t
Definition: os2threads.h:53
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions