ios下编译ffmpeg：Mac OS X 10.9.2 + XCode 5.1 + iOS7.1 + ffmpeg 2.1

wheat

　　编译环境：Mac OS X 10.9.2 + XCode 5.1 + iOS7.1
　　FFmpeg版本：2.1
　　测试视频地址：http://livecdn.cdbs.com.cn/fmvideo.flv
　　
　　参考链接：
　　iOS下完美编译ffmpeg+x264，支持armv7, armv7s, 模拟器(支持iOS7&XCode5)
　　Installing ffmpeg ios libraries armv7, armv7s, i386 and universal on Mac with 10.8
　　
　　
　　Support universal ffmpeg library for iOS7 and XCode5:
　　Make sure you have the latest Command Line Tools under Xcode >; Preferences >; Downloads >; Components
　　我的Xcode版本是5.1，Command Line Tools 位于 Xcode -> Preferences -> Locations.


一、安装gas-preprocessor
　　Install gas-preprocessor

• Click on the ZIP icon to download https://github.com/mansr/gas-preprocessor.
  
• Copy gas-preprocessor.pl to /usr/bin directory.
  
• Change permission of gas-preprocessor.pl by setting the privilege to Read & Write for all.
  

　　install-gas.sh：



echo "install gas-preproccesor.pr"
git clone git://github.com/mansr/gas-preprocessor.git
echo "copy gas-preprocessor.pl to /usr/sbin"
sudo cp -f gas-preprocessor/gas-preprocessor.pl /usr/sbin/
echo "set execute right"
chmod a+rwx /usr/sbin/gas-preprocessor.pl
echo "install finished."
　　

二.开始编译ffmpeg
　　Download my shell script from: https://gist.github.com/m1entus/6983547
　　Run sh build-ffmpeg.sh.
　　改写了脚本，install-ffmpeg.sh:
　　注意：
　　1. VERSION改为ffmpeg版本，SDKVERSION改为iOS SDK版本
　　2. 编译针对armv7和armv7s平台要加入

--disable-armv6 \
--disable-armv6t2 \
　　3. gcc xcode5默认使用的是clang：

--cc="${DEVELOPER}/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" \
　　4. 最好分别针对armv7、armv7s、i386进行编译：i386代表模拟器，armv6、armv7、armv7s是arm CPU的指令集，一般是向下兼容的。



#!/bin/bash
###########################################################################
#  Choose your ffmpeg version and your currently-installed iOS SDK version:
#
VERSION="2.1"
SDKVERSION="7.1"
echo "install gas-* perl script"
./install-gas.sh
#
#
###########################################################################
#
# Don't change anything under this line!
#
###########################################################################
# No need to change this since xcode build will only compile in the
# necessary bits from the libraries we create
ARCHS="armv7 armv7s i386"
#ARCHS="i386"
DEVELOPER=`xcode-select -print-path`
cd "`dirname \"$0\"`"
REPOROOT=$(pwd)
# Where we'll end up storing things in the end
OUTPUTDIR="${REPOROOT}/dependencies"
mkdir -p ${OUTPUTDIR}/include
mkdir -p ${OUTPUTDIR}/lib
mkdir -p ${OUTPUTDIR}/bin

BUILDDIR="${REPOROOT}/build"
mkdir -p $BUILDDIR
# where we will keep our sources and build from.
SRCDIR="${BUILDDIR}/src"
mkdir -p $SRCDIR
# where we will store intermediary builds
INTERDIR="${BUILDDIR}/built"
mkdir -p $INTERDIR
########################################
cd $SRCDIR
# Exit the script if an error happens
set -e
if [ ! -e "${SRCDIR}/ffmpeg-${VERSION}.tar.bz2" ]; thenecho "Downloading ffmpeg-${VERSION}.tar.bz2"
curl -LO http://ffmpeg.org/releases/ffmpeg-${VERSION}.tar.bz2
elseecho "Using ffmpeg-${VERSION}.tar.bz2"fi
tar zxf ffmpeg-${VERSION}.tar.gz -C $SRCDIR
cd "${SRCDIR}/ffmpeg-${VERSION}"
set +e # don't bail out of bash script if ccache doesn't exist
CCACHE=`which ccache`
if [ $? == "0" ]; then
echo "Building with ccache: $CCACHE"
CCACHE="${CCACHE} "
else
echo "Building without ccache"
CCACHE=""
fi
set -e # back to regular "bail out on error" mode
for ARCH in ${ARCHS}
do
if [ "${ARCH}" == "i386" ];
then
PLATFORM="iPhoneSimulator"
EXTRA_CONFIG="--arch=i386 --disable-asm --enable-cross-compile --target-os=darwin --cpu=i386"
EXTRA_CFLAGS="-arch i386"
EXTRA_LDFLAGS="-I${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk/usr/lib -mfpu=neon"
else
PLATFORM="iPhoneOS"
EXTRA_CONFIG="--arch=arm --target-os=darwin --enable-cross-compile --cpu=cortex-a9 --disable-armv5te"
EXTRA_CFLAGS="-w -arch ${ARCH} -mfpu=neon"
EXTRA_LDFLAGS="-mfpu=neon"
fi
mkdir -p "${INTERDIR}/${ARCH}"
LOG="${INTERDIR}/${ARCH}/build-ffmpeg-${VERSION}.log"
export CROSS_TOP="${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer"
export CROSS_SDK="${PLATFORM}${SDKVERSION}.sdk"
export RANLIB=${CROSS_TOP}/usr/bin/ranlib
echo "Building ffmpeg-${VERSION} for ${PLATFORM} ${SDKVERSION} ${ARCH}"
echo "Please stand by..."

./configure \
--prefix="${INTERDIR}/${ARCH}" \
--cc="${DEVELOPER}/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-iconv \
--disable-bzlib \
--enable-avresample \
--disable-armv6 \
--disable-armv6t2 \
--sysroot="${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk" \
--extra-cflags="${EXTRA_CFLAGS} -miphoneos-version-min=${SDKVERSION} -I${OUTPUTDIR}/include" \
--extra-ldflags="-arch ${ARCH} ${EXTRA_LDFLAGS} -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk -miphoneos-version-min=${SDKVERSION} -L${OUTPUTDIR}/lib" ${EXTRA_CONFIG} \
--enable-pic \
--extra-cxxflags="$CPPFLAGS -I${OUTPUTDIR}/include -isysroot ${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk"
make -j16 && make install && make clean

#make >> "${LOG}" 2>&1
#make install >> "${LOG}" 2>&1
#make clean >> "${LOG}" 2>&1

done
#mkdir -p "${INTERDIR}/universal/lib"
#cd "${INTERDIR}/armv7/lib"
#for file in *.a
#do
#cd ${INTERDIR}
#xcrun -sdk iphoneos lipo -output universal/lib/$file  -create -arch armv7 armv7/lib/$file -arch armv7s armv7s/lib/$file -arch i386 i386/lib/$file
#echo "Universal $file created."
#done
#cp -r ${INTERDIR}/armv7/include ${INTERDIR}/universal/
echo "Done."
三、合并armv7 armv7s i386  创建fat类型的静态库
　　create-universal.sh：



echo "create universal ..."
REPOROOT=$(pwd)
BUILDDIR="${REPOROOT}/build"
INTERDIR="${BUILDDIR}/built"
mkdir -p "${INTERDIR}/universal/lib"
cd "${INTERDIR}/armv7/lib"
for file in *.a
do
cd ${INTERDIR}
xcrun -sdk iphoneos lipo -output universal/lib/$file  -create -arch armv7 armv7/lib/$file -arch armv7s armv7s/lib/$file -arch i386 i386/lib/$file
echo "Universal $file created."
done
cp -r ${INTERDIR}/armv7/include ${INTERDIR}/universal/
echo "install finished."
四、调试kxmovie和iFrameExtractor（推荐使用kxmovie，已经视频和音频同步）
　　kxmovie主页：https://github.com/kolyvan/kxmovie  
　　iFrameExtractor：https://github.com/lvjian700/ffmpegc-demo（推荐使用这个，官方的版本太老了）
　　iFrmaeExtractor只能播放视频，没有音频，不推荐。
　　使用kxmovie的方法：
　　1.添加依赖库文件：MediaPlayer, CoreAudio, AudioToolbox, Accelerate, QuartzCore, OpenGLES and libz.dylib，libiconv.dylib
　　2.添加ffmpeg lib库文件：libavcodec.a, libavformat.a, libavutil.a, libswscale.a, libswresample.a

　　3.添加头文件搜索路径

　　
　　参考资料：
　　
　　iOS下完美编译ffmpeg+x264，支持armv7, armv7s, 模拟器(支持iOS7&XCode5)   
　　Installing ffmpeg ios libraries armv7, armv7s, i386 and universal on Mac with 10.8
　　iOS: FFmpeg编译和使用问题总结（也不错的，针对ffmpeg 2.X 和 ffmpeg 0.7编译）
　　http://witcheryne.iyunv.com/blog/1734706
　　编译ffmpeg for iOS,并调试iFrameExtractor demo
　　iOS使用ffmpeg播放rstp实时监控视频数据流（使用kxmovie）
　　
　　
　　ffmpeg历史版本下载地址：http://ffmpeg.org/releases/
　　gas-preprocessor脚本地址: https://github.com/mansr/gas-preprocessor
　　FFmpeg 2.X 编译脚本：https://gist.github.com/m1entus/6983547
　　kxmovie git地址：https://github.com/kolyvan/kxmovie
　　iFrameExtractor：https://github.com/lvjian700/ffmpegc-demo（推荐使用这个，官方的版本太老了）
　　
　　编译过程中碰到的问题：
　　1. 报错：

cputype (12) does not match previous archive members cputype (7)(all members must match)
解决方案：http://www.xcoder.cn/html/mobile/iOS/2013/0307/1604.html
So be sure to make clean to start anew.
　　2.如果是针对armv7、armv7s编译，ffmpeg configure中要加入

--disable-armv6 \
--disable-armv6t2 \
　　3.gcc xcode5默认使用的是clang