一、编译过程
1.下载源码
2.预先编译作为插件的库fdk-aac，x264等。
3.安装yasm
4.安装编译工具
5.编写脚本
6.执行脚本
ffmpeg-ios流程.png
二、脚本注解(包含fdk,x264库的集成，如果不包含编译，需要移除configure相关编译参数)
#!/bin/sh
# directories
#赋值源码版本
SOURCE="ffmpeg-4.0.1"
#FAT文件夹名称
FAT="FFmpeg-iOS"
#文件夹名称
SCRATCH="scratch"
# must be an absolute path
#THIN路径
THIN=`pwd`/"thin"
#架构类型数组
ARCHS="arm64 armv7"
# absolute path to x264 library
X264=`pwd`/x264-ios
# absolute path to fdk-aac library
FDK_AAC=`pwd`/fdk-aac-ios
#编译选项
CONFIGURE_FLAGS="--enable-gpl --disable-shared --disable-stripping --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-avdevice --disable-indevs --disable-filters --disable-devices --disable-parsers --disable-postproc --disable-debug --disable-asm --disable-yasm --disable-doc --disable-bsfs --disable-muxers --disable-demuxers --disable-ffplay --disable-ffprobe --disable-indevs --disable-outdevs --enable-cross-compile --enable-filter=aresample --enable-bsf=aac_adtstoasc --enable-small --enable-dct --enable-dwt --enable-lsp --enable-mdct --enable-rdft --enable-fft --enable-static --enable-version3 --enable-nonfree --disable-encoders --enable-encoder=pcm_s16le --enable-encoder=aac --enable-encoder=libx264 --enable-encoder=mp2 --disable-decoders --enable-decoder=aac --enable-decoder=mp3 --enable-decoder=h264 --enable-decoder=pcm_s16le --disable-parsers --enable-parser=aac --enable-parser=mpeg4video --enable-parser=mpegvideo --enable-parser=mpegaudio --enable-parser=aac --disable-muxers --enable-muxer=flv --enable-muxer=mp4 --enable-muxer=wav --enable-muxer=adts --disable-demuxers --enable-demuxer=flv --enable-demuxer=mpegvideo --enable-demuxer=mpegtsraw --enable-demuxer=mpegts --enable-demuxer=mpegps --enable-demuxer=h264 --enable-demuxer=y4m --enable-demuxer=wav --enable-demuxer=aac --enable-demuxer=hls --enable-demuxer=mov --enable-demuxer=m4v --disable-protocols --enable-protocol=rtmp --enable-protocol=http --enable-protocol=file --enable-libx264 --enable-libfdk-aac --enable-libfdk_aac --enable-encoder=libfdk_aac"
COMPILE="y"
LIPO="y"
#支持的iOS最低版本
DEPLOYMENT_TARGET="8.0"
#赋值部分结束
if [ "$*" ]
then
if [ "$*" = "lipo" ]
then
# skip compile
COMPILE=
else
ARCHS="$*"
if [ $# -eq 1 ]
then
# skip lipo
LIPO=
fi
fi
fi
if [ "$COMPILE" ]
then
#是否安装yasm，x86汇编反汇编器 支持16位、32位、64位
if [ ! `which yasm` ]
then
echo 'Yasm not found'
#是否安装brew软件包管理工具
if [ ! `which brew` ]
then
echo 'Homebrew not found. Trying to install...'
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" \
|| exit 1
fi
echo 'Trying to install Yasm...'
brew install yasm || exit 1
fi
#是否已经安装ffmpeg编译工具
if [ ! `which gas-preprocessor.pl` ]
then
echo 'gas-preprocessor.pl not found. Trying to install...'
(curl -L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl \
-o /usr/local/bin/gas-preprocessor.pl \
&& chmod +x /usr/local/bin/gas-preprocessor.pl) \
|| exit 1
fi
if [ ! -r $SOURCE ]
then
echo 'FFmpeg source not found. Trying to download...'
#尝试下载对于的ffmpeg源码并解压，如果失败就退出
curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj \
|| exit 1
fi
#赋值当前路径
CWD=`pwd`
#遍历需要编译的架构
for ARCH in $ARCHS
do
echo "building $ARCH..."
#创建/scratch/$ARCH目录
mkdir -p "$SCRATCH/$ARCH"
#进入目录
cd "$SCRATCH/$ARCH"
CFLAGS="-arch $ARCH"
if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
then
#如果是模拟器
PLATFORM="iPhoneSimulator"
#编译参数 最低系统版本
CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
else
#如果是真机
PLATFORM="iPhoneOS"
CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET"
if [ "$ARCH" = "arm64" ]
then
EXPORT="GASPP_FIX_XCODE5=1"
fi
fi
#PLATFORM变量转换为小写并赋值给XCRUN_SDK
XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
CC="xcrun -sdk $XCRUN_SDK clang"
CXXFLAGS="$CFLAGS"
LDFLAGS="$CFLAGS"
if [ "$X264" ]
then
#指定头文件路径
CFLAGS="$CFLAGS -I$X264/include"
#指定库路径
LDFLAGS="$LDFLAGS -L$X264/lib"
fi
if [ "$FDK_AAC" ]
then
CFLAGS="$CFLAGS -I$FDK_AAC/include"
LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"
fi
#修改configure编译参数
TMPDIR=${TMPDIR/%\/} $CWD/$SOURCE/configure \
--target-os=darwin \
--arch=$ARCH \
--cc="$CC" \
$CONFIGURE_FLAGS \
--extra-cflags="$CFLAGS" \
--extra-ldflags="$LDFLAGS" \
--prefix="$THIN/$ARCH" \
|| exit 1
#清除之前编译的可执行文件及配置文件。
echo 'build-ffmpeg:make clean'
make clean
echo 'build-ffmpeg:make'
#make || exit 1
echo 'build-ffmpeg:make install'
#make install $EXPORT || exit 1
make -j3 install $EXPORT || exit 1
cd $CWD
done
fi
if [ "$LIPO" ]
then
echo "building fat binaries..."
mkdir -p $FAT/lib
set - $ARCHS
CWD=`pwd`
cd $THIN/$1/lib
for LIB in *.a
do
cd $CWD
echo lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB 1>&2
#合并.a库
lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1
done
cd $CWD
cp -rf $THIN/$1/include $FAT
fi
echo Done
三、相关命令
| 命令/参数 | 说明 |
|---|---|
| which | 查看可执行文件的位置 |
| curl | 下载相关资源 |
| tar xj | 解压相关资源 |
make|对源代码包进行编译|
make install |安装编译后的代码包|
configure|生成makefile文件，并可在后面指定相关编译选项|
configure 编译选项，可用 ./configure --help查看
| 参数 | 说明 [默认] |
|---|---|
| --target-os | compiler targets OS [] |
| --prefix=PREFIX | install in PREFIX [/usr/local] |
| --cc=CC | use C compiler CC [gcc] |
| --extra-cflags=ECFLAGS | 指定头文件路径 add ECFLAGS to CFLAGS [] |
| --extra-ldflags=ELDFLAGS | 指定库文件路径 add ELDFLAGS to LDFLAGS [] |
参考：
configure/make/make install的作用
https://www.linuxidc.com/Linux/2011-02/32211.htm
CFLAGS LDFLAGS详解
https://blog.csdn.net/xinyuan510214/article/details/50457433
https://blog.csdn.net/shenhuxi_yu/article/details/79788760
https://www.jianshu.com/p/e590f041c5f6
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