android studio;ffmpeg;ndk;jni

修改步驟：

1. 首先通過NDK14編譯出libffmpeg.so ,將include目錄取出

2. 通過AS建立基於jni的工程項目，將include目錄放到cpp下；創建jniLibs/armeabi目錄，將libffmpeg.so放到裏邊

3.配置CMakeLists.txt

添加如下：

#add the ffmpeg lib
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/main/cpp/include)
add_library(ffmpeg-lib  SHARED IMPORTED )
set_target_properties(ffmpeg-lib PROPERTIES IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/src/main/jniLibs/armeabi/libffmpeg.so)

target_link_libraries( native-lib
 
                       ffmpeg-lib             #ffmpeg lib
                       android                #use the android log lib
                       ${log-lib} )

4.配置build.gradle

主要添加arguments 和 ndk的配置

externalNativeBuild {
    cmake {
        cppFlags " "
        arguments ‘-DANDROID_TOOLCHAIN=clang‘,‘-DANDROID_STL=gnustl_static‘
    }

    ndk {
        abiFilters  ‘armeabi‘
    }
}

5.native_lib.cpp

#include <jni.h>
#include <string>
#include <android/log.h>

extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavutil/imgutils.h"
#include "libavutil/avutil.h"

}

#define LOG_TAG "MyTagFFmpeg"
#define ALOGE(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)

extern "C"
jstring
Java_letv_com_myffmpeg_MainActivityFFmpeg_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello ,this is the first ffmpeg test !";

ALOGE("%s",hello.c_str());
char info[10000] = { 0 };
sprintf(info, "%s\n", avcodec_configuration());
hello += info;

return env->NewStringUTF(hello.c_str());
}

That‘s all.

本文出自 “專註嵌入式多媒體技術” 博客，請務必保留此出處http://zyg0227.blog.51cto.com/1043164/1947097

Android Studio2.2.3 通過JNI引用ffmpeg庫小結