使用Android Studio开发FFmpeg的正确姿势

• 2018-04-21: update ffmpeg-4.0.
• 2018-11-16: update script.
• 2019-03-11: update script, add armeabi abi support.
• 2019-04-03: update script, use android-ndk-r15c
• 2019-04-25: update script, update ffmpeg to 4.0.4, add build_ffmpeg.sh
• 2019-04-28: update script, update ffmpeg to 4.1.3, use android-ndk-r17c, armeabi update to armv6.

使用AndroidStudio 开发 FFmpeg
Keywords: gradle, cmake
关键步骤，编译FFmpeg，Android Studio 集成。

abi support: armeabi armeabi-v7a arm64-v8a x86 x86_64
ndk version: android-ndk-r17c
ffmpeg: 3.4.6, 4.0, 4.0.4, 4.1, 4.1.3
armeabi: armv6

第一步，编译ffmpeg

---

首先下载并解压

wget https://ffmpeg.org/releases/ffmpeg-4.1.3.tar.bz2
tar xvf ffmpeg-4.1.3.tar.bz2

然后编写编译脚本

#!/usr/bin/env bash

NDK_HOME=/opt/android/android-ndk-r17c
PREFIX=android-build
HOST_PLATFORM=linux-x86_64
PLATFORM=android-18
PLATFORM_64=android-21

CONFIG_LOG_PATH=${PREFIX}/log
COMMON_OPTIONS=
CONFIGURATION=

build(){
    APP_ABI=$1
    echo "======== > Start build $APP_ABI"
    case ${APP_ABI} in
    armeabi )
        ARCH="arm"
        CPU="armv6"
        MARCH="armv6"
        TOOLCHAINS="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-arm"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mfloat-abi=softfp -mfpu=vfp"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/arm-linux-androideabi"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--disable-x86asm"
    ;;
    armeabi-v7a )
        ARCH="arm"
        CPU="armv7-a"
        MARCH="armv7-a"
        TOOLCHAINS="$NDK_HOME/toolchains/arm-linux-androideabi-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/arm-linux-androideabi-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-arm"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mfloat-abi=softfp -mfpu=vfpv3-d16"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/arm-linux-androideabi"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,--fix-cortex-a8"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--enable-neon --disable-x86asm"
    ;;
    arm64-v8a )
        ARCH="aarch64"
        CPU="armv8-a"
        MARCH="armv8-a"
        TOOLCHAINS="$NDK_HOME/toolchains/aarch64-linux-android-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/aarch64-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM_64/arch-arm64"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/aarch64-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--enable-neon --disable-x86asm"
    ;;
    x86 )
        ARCH="x86"
        CPU="i686"
        MARCH="i686"
        TOOLCHAINS="$NDK_HOME/toolchains/x86-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/i686-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM/arch-x86"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mtune=intel -mssse3 -mfpmath=sse -m32"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/i686-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib -L$SYSROOT/usr/lib"
        EXTRA_OPTIONS="--disable-asm"
    ;;
    x86_64 )
        ARCH="x86_64"
        CPU="x86_64"
        MARCH="x86-64"
        TOOLCHAINS="$NDK_HOME/toolchains/x86_64-4.9/prebuilt/$HOST_PLATFORM"
        CROSS_PREFIX="$TOOLCHAINS/bin/x86_64-linux-android-"
        SYSROOT="$NDK_HOME/platforms/$PLATFORM_64/arch-x86_64"
        EXTRA_CFLAGS="-march=$MARCH"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -mtune=intel -msse4.2 -mpopcnt -m64"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -I$NDK_HOME/sysroot/usr/include/x86_64-linux-android"
        EXTRA_CFLAGS="$EXTRA_CFLAGS -isysroot $NDK_HOME/sysroot"
        EXTRA_LDFLAGS="-lc -lm -ldl -llog"
        EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath-link=$SYSROOT/usr/lib64 -L$SYSROOT/usr/lib64"
        EXTRA_OPTIONS="--disable-asm"
    ;;
    esac

    echo "-------- > Start clean workspace"
    make clean

    echo "-------- > Start build configuration"
    CONFIGURATION="$COMMON_OPTIONS"
    CONFIGURATION="$CONFIGURATION --logfile=$CONFIG_LOG_PATH/config_$APP_ABI.log"
    CONFIGURATION="$CONFIGURATION --prefix=$PREFIX"
    CONFIGURATION="$CONFIGURATION --libdir=$PREFIX/libs/$APP_ABI"
    CONFIGURATION="$CONFIGURATION --incdir=$PREFIX/includes/$APP_ABI"
    CONFIGURATION="$CONFIGURATION --pkgconfigdir=$PREFIX/pkgconfig/$APP_ABI"
    CONFIGURATION="$CONFIGURATION --arch=$ARCH"
    CONFIGURATION="$CONFIGURATION --cpu=$CPU"
    CONFIGURATION="$CONFIGURATION --cross-prefix=$CROSS_PREFIX"
    CONFIGURATION="$CONFIGURATION --sysroot=$SYSROOT"
    CONFIGURATION="$CONFIGURATION --extra-ldexeflags=-pie"
    CONFIGURATION="$CONFIGURATION $EXTRA_OPTIONS"

    echo "-------- > Start config makefile with $CONFIGURATION --extra-cflags="${EXTRA_CFLAGS}" --extra-ldflags="${EXTRA_LDFLAGS}""
    ./configure ${CONFIGURATION} \
        --extra-cflags="$EXTRA_CFLAGS" \
        --extra-ldflags="$EXTRA_LDFLAGS"

    echo "-------- > Start make $APP_ABI with -j8"
    make j8

    echo "-------- > Start install $APP_ABI"
    make install
    echo "++++++++ > make and install $APP_ABI complete."

}

build_all(){

    COMMON_OPTIONS="$COMMON_OPTIONS --target-os=android"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-static"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-shared"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-protocols"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-cross-compile"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-optimizations"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-debug"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-small"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-doc"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-programs"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffmpeg"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffplay"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-ffprobe"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-symver"
    COMMON_OPTIONS="$COMMON_OPTIONS --disable-network"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-pthreads"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-mediacodec"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-jni"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-zlib"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-pic"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-avresample"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=h264"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=mpeg4"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=mjpeg"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=png"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=vorbis"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=opus"
    COMMON_OPTIONS="$COMMON_OPTIONS --enable-decoder=flac"

    echo "COMMON_OPTIONS=$COMMON_OPTIONS"
    echo "PREFIX=$PREFIX"
    echo "CONFIG_LOG_PATH=$CONFIG_LOG_PATH"

    mkdir -p ${CONFIG_LOG_PATH}

#    build $app_abi
     build "armeabi"
     build "armeabi-v7a"
     build "arm64-v8a"
     build "x86"
     build "x86_64"
}

echo "-------- Start --------"

build_all

echo "-------- End --------"

此脚本实现了 armeabi armeabi-v7a,arm64-v8a,x86,x86_64 4个平台的编译。

• 需要设置环境变量 $NDK_PATH 路径
• --target-os=android指定android平台。
• make install-libs 表示只安装so文件

编译完成结果：

lib

第二步，项目集成

---

• 新建项目，增加C++支持。手动创建jniLibs文件夹
• 然后将上一步生成的所有文件复制到jniLibs文件夹下面
  最终目录结构：
  
  

  project
  
  然后修改CMakeLists.txt文件，集成so。

cmake_minimum_required(VERSION 3.4.1)

find_library(log-lib log)
find_library(android-lib android)

add_library(native-lib
            SHARED
            src/main/cpp/native-lib.cpp )

set(JNI_LIBS_DIR ${CMAKE_SOURCE_DIR}/src/main/jniLibs)

add_library(avutil
            SHARED
            IMPORTED )
set_target_properties(avutil
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavutil.so )

add_library(avresample
            SHARED
            IMPORTED )
set_target_properties(avresample
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavresample.so )

add_library(swresample
            SHARED
            IMPORTED )
set_target_properties(swresample
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libswresample.so )

add_library(swscale
            SHARED
            IMPORTED )
set_target_properties(swscale
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libswscale.so )

add_library(avcodec
            SHARED
            IMPORTED )
set_target_properties(avcodec
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavcodec.so )

add_library(avformat
            SHARED
            IMPORTED )
set_target_properties(avformat
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavformat.so )

add_library(avfilter
            SHARED
            IMPORTED )
set_target_properties(avfilter
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavfilter.so )

add_library(avdevice
            SHARED
            IMPORTED )
set_target_properties(avdevice
                      PROPERTIES IMPORTED_LOCATION
                      ${JNI_LIBS_DIR}/${ANDROID_ABI}/libavdevice.so )

include_directories(${JNI_LIBS_DIR}/includes)

target_link_libraries(native-lib
                      avutil avresample swresample swscale avcodec avformat avfilter avdevice
                      ${log-lib} ${android-lib} )

简要说明：

• ${ANDROID_ABI}表示目标ABI，在官方文档中有说明：https://developer.android.com/ndk/guides/cmake.html

最后再放出效果图：

FFPlayerDemo

示例代码：https://github.com/coopsrc/FFPlayerDemo