編譯支持iOS7 和 Xcode5 FFmpeg 庫

1. 命令行安裝FFmpeg：git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg(或：到https://github.com/gabriel/ffmpeg-iphone-build下載ffmpeg-iphone-build)

2. 安裝命令行工具(Command Line Tools)

   打開終端，輸入命令：xcode-select --install

   
   

   選擇“安裝”，然後同意安裝協議。

   
   

   
   

3. 下載gas-preprocessor：https://github.com/mansr/gas-preprocessor， 先將gas-preprocessor.pl拷貝到/usr/sbin/目錄中。

   然後修改gas-preprocessor.pl文件的權限。注:需要有讀，寫和執行的權限。具體操作爲，首先在命令行下進入/usr/bin目錄，然後執行chmod命令，如下圖所示:

   
   

4. 運行build-ffmpeg.sh文件：

   1、cd  /build-ffmpeg.sh 腳本的所在目錄下

   2、sh build-ffmpeg.sh

   #!/bin/bash
   ###########################################################################
   #  Choose your ffmpeg version and your currently-installed iOS SDK version:
   #
   VERSION="2.0.2"
   SDKVERSION="7.0"
   #
   #
   ###########################################################################
   #
   # 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"
   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-${VERSION}.tar.bz2" ]; then
       echo "Downloading ffmpeg-${VERSION}.tar.bz2"
       curl -LO http://ffmpeg.org/releases/ffmpeg-${VERSION}.tar.bz2
   else
       echo "Using ffmpeg-${VERSION}.tar.bz2"
   fi
   tar jxf ffmpeg-${VERSION}.tar.bz2 -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}/${ARCH}"
       ./configure --prefix="${INTERDIR}/${ARCH}" --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-iconv --disable-bzlib --enable-avresample --sysroot="${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer/SDKs/${PLATFORM}${SDKVERSION}.sdk" --cc="${DEVELOPER}/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" --as='/usr/local/bin/gas-preprocessor.pl' --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 && make install && make clean
                                                                                                                              
   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."

   
   

5. 把/build/built/universal目錄下的 lib 和 include 文件導入工程，並在header search path 配置 include文件 路徑。