1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* 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
*/
#ifndef AVCODEC_FFJNI_H
#define AVCODEC_FFJNI_H
#include <jni.h>
#include <stddef.h>
/*
* Attach permanently a JNI environment to the current thread and retrieve it.
*
* If successfully attached, the JNI environment will automatically be detached
* at thread destruction.
*
* @param attached pointer to an integer that will be set to 1 if the
* environment has been attached to the current thread or 0 if it is
* already attached.
* @param log_ctx context used for logging, can be NULL
* @return the JNI environment on success, NULL otherwise
*/
JNIEnv *ff_jni_get_env(void *log_ctx);
/*
* Convert a jstring to its utf characters equivalent.
*
* @param env JNI environment
* @param string Java string to convert
* @param log_ctx context used for logging, can be NULL
* @return a pointer to an array of unicode characters on success, NULL
* otherwise
*/
char *ff_jni_jstring_to_utf_chars(JNIEnv *env, jstring string, void *log_ctx);
/*
* Convert utf chars to its jstring equivalent.
*
* @param env JNI environment
* @param utf_chars a pointer to an array of unicode characters
* @param log_ctx context used for logging, can be NULL
* @return a Java string object on success, NULL otherwise
*/
jstring ff_jni_utf_chars_to_jstring(JNIEnv *env, const char *utf_chars, void *log_ctx);
/*
* Extract the error summary from a jthrowable in the form of "className: errorMessage"
*
* @param env JNI environment
* @param exception exception to get the summary from
* @param error address pointing to the error, the value is updated if a
* summary can be extracted
* @param log_ctx context used for logging, can be NULL
* @return 0 on success, < 0 otherwise
*/
int ff_jni_exception_get_summary(JNIEnv *env, jthrowable exception, char **error, void *log_ctx);
/*
* Check if an exception has occurred,log it using av_log and clear it.
*
* @param env JNI environment
* @param log value used to enable logging if an exception has occurred,
* 0 disables logging, != 0 enables logging
* @param log_ctx context used for logging, can be NULL
*/
int ff_jni_exception_check(JNIEnv *env, int log, void *log_ctx);
/*
* Jni field type.
*/
enum FFJniFieldType {
FF_JNI_CLASS,
FF_JNI_FIELD,
FF_JNI_STATIC_FIELD,
FF_JNI_METHOD,
FF_JNI_STATIC_METHOD
};
/*
* Jni field describing a class, a field or a method to be retrieved using
* the ff_jni_init_jfields method.
*/
struct FFJniField {
const char *name;
const char *method;
const char *signature;
enum FFJniFieldType type;
size_t offset;
int mandatory;
};
/*
* Retrieve class references, field ids and method ids to an arbitrary structure.
*
* @param env JNI environment
* @param jfields a pointer to an arbitrary structure where the different
* fields are declared and where the FFJNIField mapping table offsets are
* pointing to
* @param jfields_mapping null terminated array of FFJNIFields describing
* the class/field/method to be retrieved
* @param global make the classes references global. It is the caller
* responsibility to properly release global references.
* @param log_ctx context used for logging, can be NULL
* @return 0 on success, < 0 otherwise
*/
int ff_jni_init_jfields(JNIEnv *env, void *jfields, const struct FFJniField *jfields_mapping, int global, void *log_ctx);
/*
* Delete class references, field ids and method ids of an arbitrary structure.
*
* @param env JNI environment
* @param jfields a pointer to an arbitrary structure where the different
* fields are declared and where the FFJNIField mapping table offsets are
* pointing to
* @param jfields_mapping null terminated array of FFJNIFields describing
* the class/field/method to be deleted
* @param global threat the classes references as global and delete them
* accordingly
* @param log_ctx context used for logging, can be NULL
* @return 0 on success, < 0 otherwise
*/
int ff_jni_reset_jfields(JNIEnv *env, void *jfields, const struct FFJniField *jfields_mapping, int global, void *log_ctx);
#endif /* AVCODEC_FFJNI_H */
|
