android studio使用ffmpeg

引入步骤：
1.创建android支持c++的
2.导入编译之后的文件

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2.导入源码

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3.cmakefile

//使用的版本
cmake_minimum_required(VERSION 3.10.2)
//项目名称
project("ffmpeddemo")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
set(jnilibs ${CMAKE_SOURCE_DIR}/../libs)
set(libname native-lib)

include_directories(
        include
        ${CMAKE_SOURCE_DIR}/util
        ${CMAKE_SOURCE_DIR}/player
        ${CMAKE_SOURCE_DIR}/player/render
)

link_directories(
        ${jnilibs}/${ANDROID_ABI})

file(GLOB src-files
        ${CMAKE_SOURCE_DIR}/*.cpp
        ${CMAKE_SOURCE_DIR}/util/*.cpp
        ${CMAKE_SOURCE_DIR}/player/*.cpp
        ${CMAKE_SOURCE_DIR}/player/decoder/*.cpp
        ${CMAKE_SOURCE_DIR}/player/render/video/*.cpp
        ${CMAKE_SOURCE_DIR}/player/render/audio/*.cpp
        ${CMAKE_SOURCE_DIR}/recorder/SingleVideoRecorder.cpp
        ${CMAKE_SOURCE_DIR}/recorder/SingleAudioRecorder.cpp
        ${CMAKE_SOURCE_DIR}/recorder/MediaRecorderContext.cpp
        ${CMAKE_SOURCE_DIR}/recorder/GLCameraRender.cpp
        ${CMAKE_SOURCE_DIR}/recorder/MediaRecorder.cpp
        )
//是添加自己导入或者编写的C++源文件的作用native-lib：这个是编译成so库的名称，生成的so会在前面加lib，最后生成的so：libnative-lib.so
add_library( # Sets the name of the library.
        ${libname}

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        ${src-files}
        )

set(third-party-libs
        avformat
        avcodec
        avfilter
        swresample
        swscale
        avutil
        fdk-aac
        x264
        )

set(native-libs
        android
        EGL
        GLESv3
        OpenSLES
        log
        m
        z
        )
//支持的库
target_link_libraries( # Specifies the target library.
        ${libname}

        # Links the target library to the log library
        # included in the NDK.
        ${log-lib}
        ${third-party-libs}
        ${native-libs}
        )

4.编写cpp

extern "C" JNIEXPORT jstring JNICALL
Java_com_kangwang_ffmpeddemo_MainActivity_stringFromJNI(
        JNIEnv* env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    return env->NewStringUTF(av_version_info());
}

5,java代码

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Example of a call to a native method
        TextView tv = findViewById(R.id.sample_text);
        tv.setText(stringFromJNI());
    }

    public native String stringFromJNI();

6.安装手机会打印版本。