effmpeg、x264、aac编译

由于要写iOS播放器，需要用到effmpeg、x264库

1、编译effmpeg

具体步骤如下：

1. 下载脚本：https://github.com/kewlbear/FFmpeg-iOS-build-script
2. 解压，找到文件 build-ffmpeg.sh
3. 运行 build-ffmpeg.sh

如果有问题请查看参考资料：
http://www.cocoachina.com/ios/20150514/11827.html

2、编译x264

1.首先到http://www.videolan.org/developers/x264.html 下载最新的libx264源码包，解压之后是一个含snapshot-xxxx的一个文件夹，把它拷贝到随便一个文件夹下，重命名为x264;
2.到https://github.com/kewlbear/x264-ios 下载x264的一键编译脚本文件，把它放到跟x264文件夹同级的地方；
3.运行脚本./build-x264.sh；

参考资料：
http://blog.sina.com.cn/s/blog_47522f7f0102vcbj.html

3、编译aac

1.代码下载
在mac下面执行：wget http://downloads.sourceforge.net/project/faac/faac-src/faac-1.28/faac-1.28.tar.gz
也可以用网页打开下载，不过我用网页打开下载老是失败，后来就命令下载一次性成功。

2.代码编译
下载以后解压文件，解压以后的文件夹名修改为faac
faac脚本如下：

#!/bin/sh  
  
CONFIGURE_FLAGS="--enable-static --with-pic"  
  
ARCHS="arm64 armv7s armv7 x86_64 i386"  
  
# directories  
SOURCE="faac"  
FAT="fat-faac"  
  
SCRATCH="scratch-faac"  
# must be an absolute path  
THIN=`pwd`/"thin-faac"  
  
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"  
  
if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]  
then  
PLATFORM="iPhoneSimulator"  
CPU=  
if [ "$ARCH" = "x86_64" ]  
then  
SIMULATOR="-mios-simulator-version-min=7.0"  
HOST=  
else  
SIMULATOR="-mios-simulator-version-min=5.0"  
HOST="--host=i386-apple-darwin"  
fi  
else  
PLATFORM="iPhoneOS"  
if [ $ARCH = "armv7s" ]  
then  
CPU="--cpu=swift"  
else  
CPU=  
fi  
SIMULATOR=  
HOST="--host=arm-apple-darwin"  
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"  
CFLAGS="-arch $ARCH $SIMULATOR"  
CXXFLAGS="$CFLAGS"  
LDFLAGS="$CFLAGS"  
  
CC=$CC CFLAGS=$CXXFLAGS LDFLAGS=$LDFLAGS CPPFLAGS=$CXXFLAGS CXX=$CC CXXFLAGS=$CXXFLAGS  $CWD/$SOURCE/configure \  
$CONFIGURE_FLAGS \  
$HOST \  
--prefix="$THIN/$ARCH" \  
--disable-shared \  
--without-mp4v2  
  
make clean && make && make install-strip  
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  

参考资料：
http://blog.csdn.net/cjj198561/article/details/38382889