win10 Ubuntu 子系统下编译ffmpeg 和 x264

编译x264

• 下载x264源码
• 下载 并安装 yasm
• 在源码文件的根目录下传建android_build.sh文件,内容如下:

export ANDROID_NDK=~/linux_station/android-ndk-r21e ##linux 版ndk的路径
export TOOLCHAIN=${ANDROID_NDK}/toolchains/llvm/prebuilt/linux-x86_64
export PATH=$TOOLCHAIN/bin:$PATH ##将toolchain 下的bin 添加到系统变量中
export SYSROOT=${TOOLCHAIN}/sysroot
export AR=$TOOLCHAIN/bin/aarch64-linux-android-ar
export CC=$TOOLCHAIN/bin/aarch64-linux-android21-clang
export CXX=$TOOLCHAIN/bin/aarch64-linux-android21-clang++
export LD=$TOOLCHAIN/bin/aarch64-linux-android-ld
export RANLIB=$TOOLCHAIN/bin/aarch64-linux-android-ranlib
export STRIP=$TOOLCHAIN/bin/aarch64-linux-android-strip

./configure \
   ## --prefix=./so  \ ## 指定生成的lib和include 文件的路径,若不设置,则默认生成在usr/local下
    --sysroot=${SYSROOT} \
    --enable-shared \
    --enable-pic \
    --host=aarch64-linux-android ##这里指定host的版本,根据需要可以选择 arm 还是arm64(aarch),x86

make clean
make 
make install

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• 修改x264 configure 文件中的SONAME 命名的code,$API是x264的版本号,如157 否则导入到Android项目中后 编译apk时,.so.157的文件不会加载到apk的lib中

  echo "SONAME=libx264.so.$API" >> config.mak 修改为 echo "SONAME=libx264.so" >> config.mak

• 在terminal 中执行 sudo ./android_build.sh,编译完成后,terminal中会打印生成的 lib 和 include 的路径

编译ffmpeg

• 下载ffmpeg的源码
• 在源码文件的根目录下传建android_build.sh文件,内容如下:

轻松教你移植FFmpeg到Arm-Linux开发板

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NDK=~/linux_station/android-ndk-r21e

TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64
SYSROOT=${TOOLCHAIN}/sysroot
PLATFORMS=$NDK/platforms
AR=$TOOLCHAIN/bin/aarch64-linux-android-ar
AS=$TOOLCHAIN/bin/aarch64-linux-android-as
CC=$TOOLCHAIN/bin/aarch64-linux-android21-clang
CXX=$TOOLCHAIN/bin/aarch64-linux-android21-clang++
LD=$TOOLCHAIN/bin/aarch64-linux-android-ld
RANLIB=$TOOLCHAIN/bin/aarch64-linux-android-ranlib
STRIP=$TOOLCHAIN/bin/aarch64-linux-android-strip
NM=$TOOLCHAIN/bin/aarch64-linux-android-nm
## 若出现 libm.so找不到的问题时,设置一下试试
ADDI_LDFLAGS="-Wl,-rpath-link=$SYSROOT/usr/lib/aarch64-linux-android/21"

#arm64 x86 x86_64 对应 aarch64 i686 x86_64 
PREFIX=./SO/aarch64

./configure \
--prefix=$PREFIX \
--disable-static \
--enable-shared \
--enable-small \
--enable-gpl \
--enable-version3 \
--enable-pic \
--disable-doc \
--enable-asm \
--enable-cross-compile \
--target-os=android \
--arch=aarch64 \
--cc=$CC \
--ar=$AR \
--cxx=$CXX \
--ranlib=$RANLIB \
--strip=$STRIP \
--nm=$NM \
--sysroot=$SYSROOT \
--enable-libx264 \
--extra-ldflags=$ADDI_LDFLAGS \


make clean
make -j4
make install

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• 安装 pkg-config ,命令如下
  sudo apt-get install pkg-config

• 在 /etc/profile中将生成的x264的include 和 lib 配置到PATH中 , 如下:

  由于没有设置 --prefix的路径,所有我这边x264生成的include和lib在/usr/local下

  export PATH=/usr/local/bin:$PATH 
  export PATH=/usr/local/lib:$PATH
  export PATH=/usr/local/include:$PATH
  
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• 在 /etc/profile中将x264 生成的lib/pkgconfig 路径配置到PKG_CONFIG_PATH,如下:
  为了解决ERROR: x264 not found using pkg-config 问题

  export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH
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• 若出现 libm.so找不到的问题时,设置一下-rpath-link 试试

  ADDI_LDFLAGS="-Wl,-rpath-link=$SYSROOT/usr/lib/aarch64-linux-android/21"
  ./configure \
  ...
  --extra-ldflags=$ADDI_LDFLAGS \
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• 在terminal中执行 sudo ./android_build.sh

导入Android项目

• 将ffmpeg和 x264 编译生成 的lib 和include 文件夹copy 到Android项目中,如下图
  

  • CMakeLists.txt code 如下:

cmake_minimum_required(VERSION 3.10.2)
SET(CMAKE_BUILD_TYPE "Debug")
# Declares and names the project.
add_compile_options(-g)

project("handler")

add_library( # Sets the name of the library.
        handler

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        image/image_handler.cpp
        image/image_handler.h
        video/video_handler.cpp
        video/video_dealer.cpp
        video/video_dealer.h
        video/video_handler.h)
message("${CMAKE_CURRENT_SOURCE_DIR}")
message("${CMAKE_ANDROID_ARCH_ABI}")
# CMAKE_CURRENT_SOURCE_DIR code source的目录，cpp
set(distribution_DIR ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_ANDROID_ARCH_ABI}/lib)

include_directories(${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_ANDROID_ARCH_ABI}/include)
# 添加 ffmpeg so文件
add_library( avcodec SHARED IMPORTED)
set_target_properties( avcodec PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libavcodec.so)

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

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

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

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

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

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

add_library( postproc SHARED IMPORTED)
set_target_properties( postproc PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libpostproc.so)

add_library( x264 SHARED IMPORTED)
set_target_properties( x264 PROPERTIES IMPORTED_LOCATION ${distribution_DIR}/libx264.so)

find_library(
        log-lib
        log)

target_link_libraries( # Specifies the target library.
        handler
        avcodec
        avdevice
        avfilter
        avformat
        avutil
        swscale
        swresample
        postproc
        x264
        jnigraphics
        ${log-lib}
        android)

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