android studio 配置ffmpeg

1）把编译生成的so库复制到libs文件夹下，同时把include里面的头文件也复制到libs文件夹下。

2）在build.gradle中添加一下代码

defaultConfig {        applicationId "com.houde.ffmpeg.test"        minSdkVersion 21        targetSdkVersion 28        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"        externalNativeBuild {            cmake {                cppFlags "-frtti -fexceptions"                abiFilters 'armeabi-v7a'            }        }        sourceSets{            main{                jniLibs.srcDirs = ['libs']            }        }        ndk{            abiFilters 'armeabi-v7a'        }    }

3)在CMakeList.txt中添加一下代码

include_directories(libs/include)set(DIR ${CMAKE_SOURCE_DIR}/libs)add_library(avcodec        SHARED        IMPORTED)set_target_properties(avcodec        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libavcodec.so)add_library(avdevice        SHARED        IMPORTED)set_target_properties(avdevice        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libavdevice.so)add_library(avformat        SHARED        IMPORTED)set_target_properties(avformat        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libavformat.so)add_library(avutil        SHARED        IMPORTED)set_target_properties(avutil        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libavutil.so)add_library(postproc        SHARED        IMPORTED)set_target_properties(postproc        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libpostproc.so)add_library(swresample        SHARED        IMPORTED)set_target_properties(swresample        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libswresample.so)add_library(swscale        SHARED        IMPORTED)set_target_properties(swscale        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libswscale.so)add_library(avfilter        SHARED        IMPORTED)set_target_properties(avfilter        PROPERTIES IMPORTED_LOCATION        ${DIR}/armeabi-v7a/libavfilter.so)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).        src/main/cpp/native-lib.cpp)target_link_libraries( # Specifies the target library.        native-lib        avfilter        avcodec        avdevice        avformat        avutil        postproc        swresample        swscale        # Links the target library to the log library        # included in the NDK.        ${log-lib})

4)检查配置的so是否正确,在native-lib.cpp文件中引入libavcodec/avcodec.h，修改返回的字符串内容：

 std::string hello = avcodec_configuration();    return env->NewStringUTF(hello.c_str());

显示结果：

错误记录：
1）ffmpeg函数不能被识别
编译是出现" undefined reference to 'avcodec_register_all()"和“Error:(15) undefined reference to 'avcodec_configuration()”，错误如下

Error:(15) undefined reference to 'avcodec_register_all()'Error:(15) undefined reference to 'avcodec_configuration()'

这是因为ffmpeg是一个纯C语言编写的库，使用C++调用C代码时候，需要使用“extern “C””包围头文件“avcodec.h”和相关代码，如下：

#include #include #ifdef __cplusplusextern "C" {#endif#include "libavcodec/avcodec.h"#include "libavutil/avutil.h"JNIEXPORT jstring JNICALLJava_com_houde_ffmpeg_test_MainActivity_stringFromJNI(        JNIEnv *env,        jobject /* this */) {    std::string hello = avcodec_configuration();    return env->NewStringUTF(hello.c_str());}#ifdef __cplusplus};#endif

参考文章：
https://www.jianshu.com/p/435bb46b33a9
https://blog.csdn.net/eieihihi/article/details/74153201

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