mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-04 15:28:19 +02:00
![Matthieu Bouron](/assets/img/avatar_default.png)
If a JNI environment is not already attached to the thread where the MediaCodec calls are made the current implementation will attach / detach an environment for each MediaCodec call wasting some CPU time. ff_jni_get_env replaces ff_jni_{attach,detach} by permanently attaching an environment (if it is not already the case) to the current thread. The environment will be automatically detached at the thread destruction using a pthread_key callback. Saves around 5% of CPU time (out of 20%) while decoding a stream with MediaCodec.
146 lines
4.8 KiB
C
146 lines
4.8 KiB
C
/*
|
|
* 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>
|
|
|
|
/*
|
|
* 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;
|
|
int 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 */
|