【Android RTMP】Android Studio 集成 x264 开源库 ( Ubuntu 交叉编译 | Android Studio 导入函数库 )（二）

root@octopus:~/rtmp/x264-master# ls
AUTHORS         build.sh  config.guess  configure  doc      example.c  filters  Makefile  tools       x264.c     x264dll.c  x264res.rc
autocomplete.c  common    config.sub    COPYING    encoder  extras     input    output    version.sh  x264cli.h  x264.h
root@octopus:~/rtmp/x264-master# chmod -R 777 build.sh

apply plugin: 'com.android.application'
android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "kim.hsl.rtmp"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags ""
                abiFilters 'armeabi-v7a'
            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
            version "3.10.2"
        }
    }
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

cmake_minimum_required(VERSION 3.4.1)
# 链接 src/main/cpp/librtmp 目录下的构建脚本
add_subdirectory(librtmp)
add_library( # 函数库名称
             native-lib
             # 动态库类型
             SHARED
             # 源文件
             native-lib.cpp )
find_library( # 日志库
              log-lib
              log )
# 设置头文件搜索路径
include_directories(include)
# 通过设置编译选项, 设置函数库的搜索路径
# 此处的 ANDROID_ABI 是在
# build.gradle android->defaultConfig->externalNativeBuild->cmake
# 下的 abiFilters 中设置
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -L${CMAKE_SOURCE_DIR}/libs/${ANDROID_ABI}")
target_link_libraries( # 链接动态库
                       native-lib
                       # 编译的 rtmp 静态库
                       rtmp
                       ${log-lib} )

# 截取的两个配置片段
FLAGS="...-D__ANDROID_API__=21..."
./configure \
...
--sysroot=$NDK_ROOT/platforms/android-21/arch-arm \
...

apply plugin: 'com.android.application'
android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "kim.hsl.rtmp"
        // 核心 ---------------------------------
        minSdkVersion 21
        // 核心 ---------------------------------
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags ""
                abiFilters 'armeabi-v7a'
            }
        }
    }
    ...
}
...