Android Studio使用cmake编译LAME、FDK_AAC、X264

1. 使用cmake编译LAME

首先先把libmp3lame中的.c和.h文件（里面文件夹不用管）以及include中的lame.h复制到cpp中，也可以创建文件夹方便管理。

修改CMakeList.txt文件，设置动态库的地址我一直出问题，明明可以指向外面的libs，但是它不能在外面的libs创建，只会在cpp里再创建libs。不知道为啥。
CMakeList.txt文件内容：

cmake_minimum_required(VERSION 3.18.1)

project("testlame")

// 设置动态库的存放地址
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/libs/${ANDROID_ABI})

#add_executable(demo demo.cpp) # 生成可执行文件

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

        # Sets the library as a shared library.
        SHARED

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

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)
target_link_libraries( # Specifies the target library.
        lame-lib

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

修改build-gradle文件

android{
		externalNativeBuild {
        	cmake {
                cppFlags '-frtti -fexceptions'
                cFlags '-DSTDC_HEADERS'
            }
        }
        ndk {
            abiFilters 'armeabi-v7a','arm64-v8a'
        }
}

然后就可以去试试看看能不能引用了

FDK_AAC编译

https://blog.csdn.net/KayChanGEEK/article/details/103216139

然后open object 进入vs里面进行编译，然后他会在build文件夹里生成DEBUG，里面就是编译后的成品。

X264编译

https://blog.csdn.net/mytzs123/article/details/123284565

最后需要make的时候可能会提示：没有make这个命令，只需要下载https://www.benequidem.eu/index.php/download/make/
这个然后解压和msys2放在一个文件夹里就行。