C++ 1.FFmpeg-3.3.6 编译 Android 动态库 (ubuntu 18.04 , r14b)
编译环境
Linux 系统：
ubuntu18.04
NDK
FFmpeg
ffmpeg 下载后的文件名
ffmpeg_3.3.6.orig.tar.xz
解压方式
tar xvJf ffmpeg_3.3.6.orig.tar.xz
在 root 权限下操作
编译
-
进入ffmpeg目录，先修改 configure 文件
修改前
SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'
修改后
SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'
修改后执行 ./configure (如果编译失败，大多情况是复制粘贴格式问题)
-
编写 Android 编译脚本
新建文件 build_android_all.sh
#!/bin/bash
export NDK_HOME=/home/build/workspace/hqq/vision/vision-app/ndk/android-ndk-r14b
export PLATFORM_VERSION=android-21
function build
{
echo "start build ffmpeg for $ARCH"
./configure --target-os=linux \
--prefix=$PREFIX --arch=$ARCH \
--disable-doc \
--enable-shared \
--disable-static \
--disable-yasm \
--disable-asm \
--disable-symver \
--enable-gpl \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--cross-prefix=$CROSS_COMPILE \
--enable-cross-compile \
--sysroot=$SYSROOT \
--enable-small \
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make -j16
make install
echo "build ffmpeg for $ARCH finished"
}
#arm
ARCH=arm
ARCH_PREFIX=arm
CPU=armv7-a
PREFIX=$(pwd)/android_all/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/$ARCH_PREFIX-linux-androideabi-4.9/prebuilt/linux-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/$ARCH_PREFIX-linux-androideabi-
ADDI_CFLAGS="-marm -march=$CPU"
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
build
#arm64
ARCH=arm64
ARCH_PREFIX=aarch64
CPU=armv8-a
PREFIX=$(pwd)/android_all/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/$ARCH_PREFIX-linux-android-4.9/prebuilt/linux-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/$ARCH_PREFIX-linux-android-
ADDI_CFLAGS="-march=$CPU"
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
build
#x86
ARCH=x86
ARCH_PREFIX=x86-4.9
CPU=i686
PREFIX=$(pwd)/android_all/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/$ARCH_PREFIX/prebuilt/linux-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/$CPU-linux-android-
ADDI_CFLAGS="-march=$CPU -mtune=intel -mssse3 -mfpmath=sse -m32"
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
build
#x86_64
ARCH=x86_64
ARCH_PREFIX=x86_64-4.9
CPU=x86-64
PREFIX=$(pwd)/android_all/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/$ARCH_PREFIX/prebuilt/linux-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/x86_64-linux-android-
ADDI_CFLAGS="-march=$CPU -mtune=intel -msse4.2 -mpopcnt -m64"
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
build
#mips
ARCH=mips
ARCH_PREFIX=mipsel
#CPU=
PREFIX=$(pwd)/android_all/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/$ARCH_PREFIX-linux-android-4.9/prebuilt/linux-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/$ARCH_PREFIX-linux-android-
ADDI_CFLAGS=""
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
#build
#mips64
ARCH=mips64
ARCH_PREFIX=mips64el
#CPU=
PREFIX=$(pwd)/android_all/$ARCH
TOOLCHAIN=$NDK_HOME/toolchains/$ARCH_PREFIX-linux-android-4.9/prebuilt/linux-x86_64
CROSS_COMPILE=$TOOLCHAIN/bin/$ARCH_PREFIX-linux-android-
ADDI_CFLAGS=""
SYSROOT=$NDK_HOME/platforms/$PLATFORM_VERSION/arch-$ARCH/
#build
执行 build_android_all.sh
可编译出 "armeabi-v7a", "arm64-v8a", "x86", "x86_64"
如果编译失败，在打开文件粘贴时
:set ff #查看文件的格式会看到fileformat=dos 或者 fileformat=unix
:set ff=unix #设置为unix格式
:wq #保存退出
编译后文件
在目录下 android_all 文件夹下
取带数字的 .so 库放到 Android 项目中
