FFmpeg静态库编译小结
卜凯旋
开篇介绍：
写这篇博客的原因是为了编译出支持 Mac App、iPad iPhone模拟器可以调试的 ffmpeg静态库。
正题：
步骤一：编译x264静态库
脚本链接：https://github.com/kewlbear/x264-ios
下载到本地。因为代码比较老。需要做一点修改，将模拟器支持的最低版本设置为8.0
#!/bin/sh
CONFIGURE_FLAGS="--enable-static --enable-pic --disable-cli --disable-asm"
ARCHS="arm64 x86_64 i386 armv7 armv7s"
# directories
SOURCE="x264"
FAT="x264-iOS"
SCRATCH="scratch-x264"
# must be an absolute path
THIN=`pwd`/"thin-x264"
COMPILE="y"
LIPO="y"
if [ "$*" ]
then
if [ "$*" = "lipo" ]
then
# skip compile
COMPILE=
else
ARCHS="$*"
if [ $# -eq 1 ]
then
# skip lipo
LIPO=
fi
fi
fi
if [ "$COMPILE" ]
then
CWD=`pwd`
for ARCH in $ARCHS
do
echo "building $ARCH..."
mkdir -p "$SCRATCH/$ARCH"
cd "$SCRATCH/$ARCH"
CFLAGS="-arch $ARCH"
ASFLAGS=
if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
then
PLATFORM="iPhoneSimulator"
CPU=
if [ "$ARCH" = "x86_64" ]
then
CFLAGS="$CFLAGS -mios-simulator-version-min=8.0"
HOST=
else
CFLAGS="$CFLAGS -mios-simulator-version-min=8.0"
HOST="--host=i386-apple-darwin"
fi
else
PLATFORM="iPhoneOS"
if [ $ARCH = "arm64" ]
then
HOST="--host=aarch64-apple-darwin"
XARCH="-arch aarch64"
else
HOST="--host=arm-apple-darwin"
XARCH="-arch arm"
fi
CFLAGS="$CFLAGS -fembed-bitcode -mios-version-min=8.0"
ASFLAGS="$CFLAGS"
fi
XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
CC="xcrun -sdk $XCRUN_SDK clang"
if [ $PLATFORM = "iPhoneOS" ]
then
export AS="$CWD/$SOURCE/tools/gas-preprocessor.pl $XARCH -- $CC"
else
export -n AS
fi
CXXFLAGS="$CFLAGS"
LDFLAGS="$CFLAGS"
CC=$CC $CWD/$SOURCE/configure \
$CONFIGURE_FLAGS \
$HOST \
--extra-cflags="$CFLAGS" \
--extra-asflags="$ASFLAGS" \
--extra-ldflags="$LDFLAGS" \
--prefix="$THIN/$ARCH" || exit 1
make -j3 install || 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
lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB
done
cd $CWD
cp -rf $THIN/$1/include $FAT
fi
修改完成，执行 cd 到脚本目录下 执行
./build-x264.sh arm64 armv7 armv7s x86_64 i386脚本之行结束后，再执行
./build-x264.sh lipox264-iOS
步骤二：ffmpeg 和x264交叉编译
ffmpeg打包脚本 https://github.com/kewlbear/FFmpeg-iOS-build-script
下载到本地后，打开x264-iOSx264-iOS
#!/bin/sh
# directories
FF_VERSION="4.2"
#FF_VERSION="snapshot-git"
if [[ $FFMPEG_VERSION != "" ]]; then
FF_VERSION=$FFMPEG_VERSION
fi
SOURCE="ffmpeg-$FF_VERSION"
FAT="FFmpeg-iOS"
SCRATCH="scratch"
# must be an absolute path
THIN=`pwd`/"thin"
# absolute path to x264 library
X264=`pwd`/x264
#FDK_AAC=`pwd`/../fdk-aac-build-script-for-iOS/fdk-aac-ios
CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \
--disable-doc --enable-pic --disable-asm"
if [ "$X264" ]
then
CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"
fi
if [ "$FDK_AAC" ]
then
CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-libfdk-aac --enable-nonfree"
fi
# avresample
#CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"
ARCHS="arm64 armv7 armv7s x86_64 i386"
COMPILE="y"
LIPO="y"
DEPLOYMENT_TARGET="8.0"
if [ "$*" ]
then
if [ "$*" = "lipo" ]
then
# skip compile
COMPILE=
else
ARCHS="$*"
if [ $# -eq 1 ]
then
# skip lipo
LIPO=
fi
fi
fi
if [ "$COMPILE" ]
then
if [ ! `which yasm` ]
then
echo 'Yasm not found'
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
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 $SOURCE ]
then
echo 'FFmpeg source not found. Trying to download...'
curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj \
|| exit 1
fi
CWD=`pwd`
for ARCH in $ARCHS
do
echo "building $ARCH..."
mkdir -p "$SCRATCH/$ARCH"
cd "$SCRATCH/$ARCH"
CFLAGS="-arch $ARCH"
if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
then
PLATFORM="iPhoneSimulator"
CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
else
PLATFORM="iPhoneOS"
CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET -fembed-bitcode"
if [ "$ARCH" = "arm64" ]
then
EXPORT="GASPP_FIX_XCODE5=1"
fi
fi
XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
CC="xcrun -sdk $XCRUN_SDK clang"
# force "configure" to use "gas-preprocessor.pl" (FFmpeg 3.3)
if [ "$ARCH" = "arm64" ]
then
AS="gas-preprocessor.pl -arch aarch64 -- $CC"
else
AS="gas-preprocessor.pl -- $CC"
fi
CXXFLAGS="$CFLAGS"
LDFLAGS="$CFLAGS"
if [ "$X264" ]
then
CFLAGS="$CFLAGS -I$X264/include"
LDFLAGS="$LDFLAGS -L$X264/lib"
fi
if [ "$FDK_AAC" ]
then
CFLAGS="$CFLAGS -I$FDK_AAC/include"
LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"
fi
TMPDIR=${TMPDIR/%\/} $CWD/$SOURCE/configure \
--target-os=darwin \
--arch=$ARCH \
--cc="$CC" \
--as="$AS" \
$CONFIGURE_FLAGS \
--extra-cflags="$CFLAGS" \
--extra-ldflags="$LDFLAGS" \
--prefix="$THIN/$ARCH" \
|| 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
lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1
done
cd $CWD
cp -rf $THIN/$1/include $FAT
fi
echo Done
修改完成后保存退出,在根目录执行
./build-ffmpeg.sh arm64 armv7 armv7s x86_64 i386编译结束后，再执行
./build-ffmpeg.sh lipo将静态库合并。
步骤三：整理
将x264文件夹下面的.a和.h文件分别移动到FFmpeg-iOS的lib 和 include文件夹下。
结语
至此，FFmpeg-iOS中的就是完整的ffmpeg +x264解码器的静态库。因为支持了全平台。所以包比较大。如果为了减小包的体积，可以考虑移除不需要的架构。
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