# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.10.2)

# Declares and names the project.

project("lame")

# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
             native-lib

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             native-lib.cpp
        bitstream.c encoder.c fft.c gain_analysis.c
        id3tag.c lame.c mpglib_interface.c newmdct.c
        presets.c psymodel.c quantize.c quantize_pvt.c
        reservoir.c set_get.c tables.c takehiro.c util.c
        vbrquantize.c VbrTag.c version.c
        )

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
              log-lib

              # Specifies the name of the NDK library that
              # you want CMake to locate.
              log )

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
                       native-lib

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

#include <jni.h>
#include <string>
#include "lame.h"

extern "C" JNIEXPORT jstring JNICALL
Java_com_tal_lame_MainActivity_stringFromJNI(
        JNIEnv* env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    // 返回LAME的版本信息
    return env->NewStringUTF(get_lame_version());
}

......
android {
    ......
    defaultConfig {
        .......
        externalNativeBuild {
            cmake {
                cppFlags "-frtti -fexceptions"
                cFlags "-DSTDC_HEADERS"
            }
        }
    }
    externalNativeBuild {
        cmake {
            path file('src/main/cpp/CMakeLists.txt')
            version '3.10.2'
        }
    }
    ndkVersion '22.1.7171670'
}

dependencies {
		......
}