前言
本文将介绍如何把FFmpeg（二）：Windows下编译全平台架构的FFmpeg中编译出的支持全平台的FFmpeg静态so库，采用CMake方式移植到AndroidStudio中，并打印出FFmpeg的信息。
正文
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1 相关文件拷贝
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1.1 添加FFmpeg编译出的静态库
在 FFmpeg（二）：Windows下编译全平台架构的FFmpeg中我们将FFmpeg编译生成了各个平台适用的静态库，我们将每个CPU下的lib路径下的所有so包提取出来，在Android工程中的libs下建立各个平台对应的文件名称，并拷贝进去，如图所示：
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1.2 拷贝头文件
将 FFmpeg（二）：Windows下编译全平台架构的FFmpeg中android_more下任意平台下的include文件夹全部拷贝至项目工程中src/main/cpp中，如图所示：
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1.3 拷贝H264头文件
在项目工程src/main/cpp/include下新建文件夹libx264，并把FFmpeg-3.2.5/libx264/android/任意CPU/include下编译出的x264.h和x264_config.h拷贝进去
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2 编写CMakeList.txt链接添加共享包
看不懂第2步骤的请回头FFmpeg（三）：初识CMakeList和native-lib
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2.1 以CMakeList.txt为基准设置相对路径
set(distribution_DIR ${CMAKE_SOURCE_DIR}/../../../../libs) -
2.2 加载头文件和设置源码路径
include_directories( # 加载头文件 src/main/cpp/include #源码路径为绝对路径，下载后请记得修改你的源码路径 E:/Workspace/OtherDemo/FFmpeg4Android-master/ffmpeg-3.2.5 ) -
2.3 add_library添加共享库
我们把libavcodec.so、libavfilter.so、libavformat.so、libavutil.so、libfdk-aac.so、libswresample.so、libswscale.so这七个库导入添加到共享库（这里不关注CPU架构），IMPORTED指2.4中根据CPU架构导入指定的so库。
add_library( avcodec SHARED IMPORTED ) add_library( avfilter SHARED IMPORTED ) add_library( avformat SHARED IMPORTED ) add_library( avutil SHARED IMPORTED ) add_library( swresample SHARED IMPORTED ) add_library( swscale SHARED IMPORTED ) add_library( fdk-aac SHARED IMPORTED )-
2.4 设置目标版本库
判断当前机型是哪个CPU架构，就加载libs下对应的so包：
#判断目标版本并设置 if(${ANDROID_ABI} STREQUAL "armeabi") set_target_properties( avcodec PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libavcodec.so ) set_target_properties( avfilter PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libavfilter.so ) set_target_properties( avformat PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libavformat.so ) set_target_properties( avutil PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libavutil.so ) set_target_properties( swresample PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libswresample.so ) set_target_properties( swscale PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libswscale.so ) set_target_properties( fdk-aac PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi/libfdk-aac.so ) endif(${ANDROID_ABI} STREQUAL "armeabi") if(${ANDROID_ABI} STREQUAL "armeabi-v7a") set_target_properties( avcodec PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libavcodec.so ) set_target_properties( avfilter PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libavfilter.so ) set_target_properties( avformat PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libavformat.so ) set_target_properties( avutil PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libavutil.so ) set_target_properties( swresample PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libswresample.so ) set_target_properties( swscale PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libswscale.so ) set_target_properties( fdk-aac PROPERTIES IMPORTED_LOCATION ../../../../libs/armeabi-v7a/libfdk-aac.so ) endif(${ANDROID_ABI} STREQUAL "armeabi-v7a") if(${ANDROID_ABI} STREQUAL "arm64-v8a") set_target_properties( avcodec PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libavcodec.so ) set_target_properties( avfilter PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libavfilter.so ) set_target_properties( avformat PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libavformat.so ) set_target_properties( avutil PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libavutil.so ) set_target_properties( swresample PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libswresample.so ) set_target_properties( swscale PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libswscale.so ) set_target_properties( fdk-aac PROPERTIES IMPORTED_LOCATION ../../../../libs/arm64-v8a/libfdk-aac.so ) endif(${ANDROID_ABI} STREQUAL "arm64-v8a") if(${ANDROID_ABI} STREQUAL "x86") set_target_properties( avcodec PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libavcodec.so ) set_target_properties( avfilter PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libavfilter.so ) set_target_properties( avformat PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libavformat.so ) set_target_properties( avutil PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libavutil.so ) set_target_properties( swresample PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libswresample.so ) set_target_properties( swscale PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libswscale.so ) set_target_properties( fdk-aac PROPERTIES IMPORTED_LOCATION ../../../../libs/x86/libfdk-aac.so ) endif(${ANDROID_ABI} STREQUAL "x86") if(${ANDROID_ABI} STREQUAL "x86_64") set_target_properties( avcodec PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libavcodec.so ) set_target_properties( avfilter PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libavfilter.so ) set_target_properties( avformat PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libavformat.so ) set_target_properties( avutil PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libavutil.so ) set_target_properties( swresample PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libswresample.so ) set_target_properties( swscale PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libswscale.so ) set_target_properties( fdk-aac PROPERTIES IMPORTED_LOCATION ../../../../libs/x86_64/libfdk-aac.so ) endif(${ANDROID_ABI} STREQUAL "x86_64")-
2.5连接共享库
将所有添加进来的共享库和NDK中查到到已有的库链接起来：
target_link_libraries( native-lib fdk-aac avcodec avfilter avformat avutil swresample swscale ${log-lib} ) -
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3 相关代码编写
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3.1新建java文件FFmpegKit，内容如下：
/** * Created by MouShao on 2018/2/28. */ public class FFmpegKit { static { //加载CMakeList中连接的共享库 System.loadLibrary("native-lib"); System.loadLibrary("avutil"); System.loadLibrary("fdk-aac"); System.loadLibrary("avcodec"); System.loadLibrary("avformat"); System.loadLibrary("swscale"); System.loadLibrary("swresample"); System.loadLibrary("avfilter"); } public static native String stringFromFFmpeg(); } -
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3.2 native-lib.cpp编写
#include <jni.h> #include <string> #include <android/log.h> extern "C" { #include "libavcodec/avcodec.h" #include "libavfilter/avfilter.h" #include "libavformat/avformat.h" #include "libavutil/imgutils.h" #include "libswresample/swresample.h" #include "libswscale/swscale.h" #include "libx264/x264.h" #define LOG_TAG "videoplayer" #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__) JNIEXPORT jstring JNICALL Java_com_pvirtech_ffmpeg4android_FFmpegKit_stringFromFFmpeg( JNIEnv *env, jobject /* this */ obj) { char info[10000] = {0}; sprintf(info, "%s\n", avcodec_configuration()); return env->NewStringUTF(info); } }; -
3.3 app下build.gradle的配置
android { ··· defaultConfig { ··· externalNativeBuild { cmake { //配置C++11标准 cppFlags "-std=c++11" } ndk{ //abi兼容设置 abiFilters "armeabi-v7a","armeabi","arm64-v8a","x86","x86_64" } } } //导入app/libs下库 sourceSets.main { jniLibs.srcDirs = ['libs'] jni.srcDirs = [] } } -
3.4 MainActivity调用
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4 运行如图所示：
结语
到此，FFmpeg的首秀就完成了，下一篇我们将如何用JNI动态注册的方式调用FFmpeg播放视频。
下一节讲：
FFmpeg（五）：JNI动态注册方法调用FFmpeg播放视频
