Android Studio引入FFmpeg的方法

新建C++工程

新建

两个externalNativeBuild

一个sourceSets（指定so路径）

android { compileSdkVersion 29 buildToolsVersion '29.0.3' defaultConfig { ... externalNativeBuild { cmake { cppFlags '-std=c++11 -frtti -fexceptions' abiFilters ’armeabi-v7a’ } } sourceSets { main { jniLibs.srcDirs = [’src/main/jniLibs’] } } } ... externalNativeBuild { cmake { path 'src/main/cpp/CMakeLists.txt' version '3.10.2' } }}

复制so和include文件

编写CMakeLists.txt

以下是默认值

cmake_minimum_required(VERSION 3.4.1)add_library(native-lib SHARED native-lib.cpp #nativ-lib2.cpp 如果有其他cpp文件可以一并打包到native-lib中)#查找系统的log库，并赋值给变量log-libfind_library( log-lib log)#将上面log-lib变量里的库连接到native-lib中target_link_libraries( native-lib ${log-lib})

CMakeLists中添加FFmpeg头文件路径

#设置FFmpeg头文件的路径include_directories( include#因为和CMakeLists.txt在同一级，所以直接写include)

CMakeLists中添加libavcodec.so

#定义一个变量avcodecadd_library( avcodec SHARED IMPORTED)#给avcodec这个变量赋值set_target_properties(avcodec PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libavcodec.so)#将avcodec混合编译到native-lib中target_link_libraries( native-lib ${log-lib} avcodec)

CMakeLists中添加全部的so

cmake_minimum_required(VERSION 3.4.1)#设置FFmpeg头文件的路径include_directories( include#因为和CMakeLists.txt在同一级，所以直接写include)add_library(native-lib SHARED native-lib.cpp)find_library( log-lib log)#1.定义一个变量avcodecadd_library( avcodec SHARED IMPORTED)#给avcodec这个变量赋值set_target_properties(avcodec PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libavcodec-57.so)#2.add_library( avdevice SHARED IMPORTED)set_target_properties(avdevice PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libavdevice-57.so)#3.add_library( avfilter SHARED IMPORTED)set_target_properties(avfilter PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libavfilter-6.so)#4.add_library( avformat SHARED IMPORTED)set_target_properties(avformat PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libavformat-57.so)#5.add_library( avutil SHARED IMPORTED)set_target_properties(avutil PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libavutil-55.so)#6.add_library( postproc SHARED IMPORTED)set_target_properties(postproc PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libpostproc-54.so)#7.add_library( swresample SHARED IMPORTED)set_target_properties(swresample PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libswresample-2.so)#8.add_library( swscale SHARED IMPORTED)set_target_properties(swscale PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/../../main/jniLibs/${ANDROID_ABI}/libswscale-4.so)#将avcodec混合编译到native-lib中target_link_libraries( native-lib ${log-lib} avcodec#1 avdevice#2 avfilter#3 avformat#4 avutil#5 postproc#6 swresample#7 swscale#8)

编写测试函数

#include <jni.h>#include <string>extern 'C' {#include 'libavcodec/avcodec.h'}extern 'C' JNIEXPORT jstring JNICALLJava_com_example_myffmpegcmd_MainActivity_stringFromJNI( JNIEnv *env, jobject /* this */) { std::string hello = 'Hello from C++'; return env->NewStringUTF(avcodec_configuration());}

总结

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