FDK_ACC for iOS

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FDK_AAC是用来编解码AAC格式音频文件的开源库。下载地址

AAC主要用于视频中音轨的编码

使用脚本编译出用于iOS的静态库

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#!/bin/sh

CONFIGURE_FLAGS="--enable-static --with-pic=yes --disable-shared"

ARCHS="arm64 x86_64 i386 armv7"

# directories
SOURCE=""
FAT="fdk-aac-ios"

SCRATCH="/Users/owenhong/fdk-aac"
# must be an absolute path
THIN=`pwd`/"thin"

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"

if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
then
PLATFORM="iPhoneSimulator"
CPU=
if [ "$ARCH" = "x86_64" ]
then
CFLAGS="$CFLAGS -mios-simulator-version-min=7.0"
HOST="--host=x86_64-apple-darwin"
else
CFLAGS="$CFLAGS -mios-simulator-version-min=7.0"
HOST="--host=i386-apple-darwin"
fi
else
PLATFORM="iPhoneOS"
if [ $ARCH = arm64 ]
then
HOST="--host=aarch64-apple-darwin"
else
HOST="--host=arm-apple-darwin"
fi
CFLAGS="$CFLAGS -fembed-bitcode"
fi

XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
CC="xcrun -sdk $XCRUN_SDK clang -Wno-error=unused-command-line-argument-hard-error-in-future"
AS="$CWD/$SOURCE/extras/gas-preprocessor.pl $CC"
CXXFLAGS="$CFLAGS"
LDFLAGS="$CFLAGS"

$CWD/$SOURCE/configure \
$CONFIGURE_FLAGS \
$HOST \
$CPU \
CC="$CC" \
CXX="$CC" \
CPP="$CC -E" \
AS="$AS" \
CFLAGS="$CFLAGS" \
LDFLAGS="$LDFLAGS" \
CPPFLAGS="$CFLAGS" \
--prefix="$THIN/$ARCH"

make -j3 install
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

一杯咖啡板蓝根的时间，编译好的静态库已经躺在指定的路径下啦。
让我们看看多架构的包包

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$file libfnk_aac.a

MachO如下，一切正常

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libfdk-aac.a: Mach-O universal binary with 4 architectures: [i386:current ar archive random library] [arm64]
libfdk-aac.a (for architecture i386):    current ar archive random library
libfdk-aac.a (for architecture armv7):    current ar archive random library
libfdk-aac.a (for architecture x86_64):    current ar archive random library
libfdk-aac.a (for architecture arm64):    current ar archive random library