android ffmpeg4.0.2编译过程记录

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这里记录一下ffmpeg的编译过程并且在Andorid中使用的过程。

编译ffmpeg

这里拿的当前日期最新的release版本ffmpeg4.0.2，编译环境mac，下载mac版本的ffmepg后进行编译，编译脚本build.sh如下：

#!/bin/bashexport NDK=/Users/linchen/Library/Android/sdk/ndk-bundleexport SYSROOT=$NDK/platforms/android-19/arch-arm/export TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64export CPU=armexport PREFIX=/Users/linchen/Desktop/arm #最终编译后的头文件以及so包的位置export ADDI_CFLAGS="-marm"function build_one{./configure \    --prefix=$PREFIX \    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \    --arch=arm \    --sysroot=$SYSROOT \    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \    --extra-ldflags="$ADDI_LDFLAGS" \    --cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc \    --nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm \    --enable-shared \    --enable-runtime-cpudetect \    --enable-gpl \    --enable-small \    --target-os=android \    --enable-cross-compile \    --disable-debug \    --disable-static \    --disable-doc \    --disable-asm \    --disable-ffmpeg \    --disable-ffplay \    --disable-ffprobe \    --enable-postproc \    --enable-avdevice \    --disable-symver \    --disable-stripping \$ADDITIONAL_CONFIGURE_FLAGsed -i '' 's/HAVE_LRINT 0/HAVE_LRINT 1/g' config.hsed -i '' 's/HAVE_LRINTF 0/HAVE_LRINTF 1/g' config.hsed -i '' 's/HAVE_ROUND 0/HAVE_ROUND 1/g' config.hsed -i '' 's/HAVE_ROUNDF 0/HAVE_ROUNDF 1/g' config.hsed -i '' 's/HAVE_TRUNC 0/HAVE_TRUNC 1/g' config.hsed -i '' 's/HAVE_TRUNCF 0/HAVE_TRUNCF 1/g' config.hsed -i '' 's/HAVE_CBRT 0/HAVE_CBRT 1/g' config.hsed -i '' 's/HAVE_RINT 0/HAVE_RINT 1/g' config.hmake clean# 这里是定义用几个CPU编译make -j4make install}build_one

build.sh在ffmpeg4.0.2的根目录下，首先需要安装一些需要的编译环境如gcc等，由于我的机子中以前已经安装了，所以直接运行bash build.sh命令就可以了，编译后在我的桌面上会出现arm文件夹：

其中include文件夹是导出的头文件文件夹，lib中的so包是需要使用的，接下来新建一个支持c++的Android项目，在新建的时候选择support c++，Android Studio会自动帮我们配置好，接下添加编译好的文件到Android Studio中：

由于我的手机是arm64-v8a的cpu架构，又由于编译ffmpeg选择的架构，所以这里使用armeabi通用架构支持，因此文件夹就创建了armeabi，如果手机cpu架构不同，可以再编译ffmpeg的时候指定对应的架构，具体参考这篇文章。

接下来编写一下Cmake代码：

cmake_minimum_required(VERSION 3.4.1)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)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)set(distribution_DIR ${CMAKE_SOURCE_DIR}/src/main/jni/armeabi)add_library( avutil             SHARED             IMPORTED )set_target_properties( avutil                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libavutil.so)add_library( swresample             SHARED             IMPORTED )set_target_properties( swresample                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libswresample.so)add_library( avcodec             SHARED             IMPORTED )set_target_properties( avcodec                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libavcodec.so)add_library( avfilter             SHARED             IMPORTED )set_target_properties( avfilter                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libavfilter.so)add_library( swscale             SHARED             IMPORTED )set_target_properties( swscale                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libswscale.so)add_library( avdevice             SHARED             IMPORTED )set_target_properties( avdevice                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libavdevice.so)add_library( avformat             SHARED             IMPORTED )set_target_properties( avformat                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libavformat.so)add_library( postproc             SHARED             IMPORTED )set_target_properties( postproc                       PROPERTIES IMPORTED_LOCATION                       ${distribution_DIR}/libpostproc.so)set(CMAKE_VERBOSE_MAKEFILE on)set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")include_directories(src/main/cpp)include_directories(src/main/jni/include)target_link_libraries( # Specifies the target library.        native-lib        avutil       #工具库(大部分需要)        swresample    #音频采样数据格式转换        avcodec      #编解码(重要)        avfilter      #滤镜特效处理        swscale       #视频像素数据格式转换        avdevice     #各种设备的输入输出        avformat     #封装格式处理        postproc     #后加工        # Links the target library to the log library        # included in the NDK.        ${log-lib})

然后再MainActivity中使用so库：

public class MainActivity extends AppCompatActivity {    // Used to load the 'native-lib' library on application startup.    static {//加载so包是有序的一定要那么写，不过这里我是复制过来的，所以没出现问题        System.loadLibrary("avutil");        System.loadLibrary("swresample");        System.loadLibrary("avcodec");        System.loadLibrary("avfilter");        System.loadLibrary("swscale");        System.loadLibrary("avdevice");        System.loadLibrary("avformat");        System.loadLibrary("postproc");        System.loadLibrary("native-lib");    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // Example of a call to a native method        TextView tv = (TextView) findViewById(R.id.sample_text);        tv.setText(stringFromJNI());    }    /**     * A native method that is implemented by the 'native-lib' native library,     * which is packaged with this application.     */    public native String stringFromJNI();}

这里编译过程中遇到一个问题：

Build command failed. Error while executing process /Users/linchen/Library/Android/sdk/cmake/3.6.4111459/bin/cmake with arguments {--

...

../../../../src/main/jni/armeabi/libavutil.so: error adding symbols: File in wrong format clang++: error: linker command failed with exit code 1 (use -v to see invocation) ninja: build stopped: subcommand failed.

问题是jni文件夹下的架构包缺失，使用ndk abi过滤器过滤即可：

ndk {            abiFilters 'armeabi'        }

编译完成后运行项目发现直接奔溃了，说ffmpeg的so包找不到，解压apk一看还真是，最终发现设置sourceSets的路径不对，修改如下：

sourceSets{        main{            jniLibs.srcDirs = ['src/main/jni']        }    }

最终编译成功，项目正常启动，不过还没写代码验证，这里主要先记录一下配置的过程。

项目地址如下：

https://github.com/JerryChan123/FFmpegDemo

参考资料

https://www.jianshu.com/p/da64059799d5

https://www.jianshu.com/p/3b58174e89f1

转载于:https://my.oschina.net/u/3863980/blog/2253455

编译ffmpeg

参考资料

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