http://blog.csdn.net/cjj198561/article/details/28955461

编译librtmp需要先编译openssl，因为librtmp依赖openssl

首先编译openssl：

把以下内容保存为shell脚本：

#!/bin/sh

VERSION="1.0.1h" #指明openssl的版本信息，比如下载的是openssl-1.0.1h.tar.gz那么对于就填写1.0.1h

SDKVERSION="7.1" #指明ios sdk的版本号，目前最新的是7.1，不清楚的同学可以 ls /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.1.sdk/ 一下看看自己的iPhoneOS7.1.sdk是不是7.1

CURRENTPATH=`pwd`
ARCHS="i386 armv7 armv7s arm64"
BUILDPATH="${CURRENTPATH}/build"
LIBPATH="${CURRENTPATH}/lib"
INCLUDEPATH="${CURRENTPATH}/include"
SRCPATH="${CURRENTPATH}/src"
LIBSSL="libssl.a"
LIBCRYPTO="libcrypto.a"
DEVELOPER=`xcode-select -print-path`

if [ ! -d "$DEVELOPER" ]; then
echo "xcode path is not set correctly $DEVELOPER does not exist (most likely because of xcode > 4.3)"
echo "run"
echo "sudo xcode-select -switch <xcode path>"
echo "for default installation:"
echo "sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer"
exit 1
fi

set -e
if [ ! -e openssl-${VERSION}.tar.gz ]; then
echo "Downloading openssl-${VERSION}.tar.gz"
curl -O http://www.openssl.org/source/openssl-${VERSION}.tar.gz
else
echo "Using openssl-${VERSION}.tar.gz"

# Remove the source directory if already exist
rm -rf "${SRCPATH}/openssl-${VERSION}"
fi

mkdir -p "${SRCPATH}"
mkdir -p "${BUILDPATH}"
mkdir -p "${LIBPATH}"
mkdir -p "${INCLUDEPATH}"

tar zxf openssl-${VERSION}.tar.gz -C "${SRCPATH}"
cd "${SRCPATH}/openssl-${VERSION}"

LIBSSL_REPO=""
LIBCRYPTO_REPO=""

for ARCH in ${ARCHS}
do
if [ "${ARCH}" == "i386" ];
then
PLATFORM="iPhoneSimulator"
else
sed -ie "s!static volatile sig_atomic_t intr_signal;!static volatile intr_signal;!" "crypto/ui/ui_openssl.c"
PLATFORM="iPhoneOS"
fi
export CROSS_TOP="${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer"
export CROSS_SDK="${PLATFORM}${SDKVERSION}.sdk"
export BUILD_TOOLS="${DEVELOPER}"

echo "Building openssl-${VERSION} for ${PLATFORM} ${SDKVERSION} ${ARCH}"
echo "Please stand by..."

export CC="${BUILD_TOOLS}/usr/bin/gcc -arch ${ARCH}"

OUTPATH="${BUILDPATH}/openssl-${PLATFORM}${SDKVERSION}-${ARCH}.sdk"
mkdir -p "${OUTPATH}"
LOG="${OUTPATH}/build-openssl-${VERSION}.log"

if [[ "$VERSION" =~ 1.0.0. ]]; then
./Configure BSD-generic32 --openssldir="${OUTPATH}" > "${LOG}" 2>&1
else
./Configure iphoneos-cross --openssldir="${OUTPATH}" > "${LOG}" 2>&1
fi

# add -isysroot to CC=
sed -ie "s!^CFLAG=!CFLAG=-isysroot ${CROSS_TOP}/Platforms/${PLATFORM}.platform/Developer/SDKs/${CROSS_SDK} -miphoneos-version-min=7.0 !" "Makefile"

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

LIBSSL_REPO+="${OUTPATH}/lib/${LIBSSL} "
LIBCRYPTO_REPO+="${OUTPATH}/lib/${LIBCRYPTO} "
done

echo "Build library..."
lipo -create ${LIBSSL_REPO}-output ${LIBPATH}/${LIBSSL}
lipo -create ${LIBCRYPTO_REPO}-output ${LIBPATH}/${LIBCRYPTO}

cp -R ${BUILDPATH}/openssl-iPhoneSimulator${SDKVERSION}-i386.sdk/include/openssl ${INCLUDEPATH}/
echo "Building done."
echo "Cleaning up..."
rm -rf ${SRCPATH}/openssl-${VERSION}
echo "Done."

保存脚本，添加脚本的执行权限（chmod +x 脚本名称）

运行脚本

不出意外是可以编译成功的，如果失败，可以以打开那个log文件，查看失败原因。

编译成功以后，把lib文件和include拷贝到你的librtmp目录（可以新建一个空得librtmp目录），在librtmp目录里面同样写一个shell脚本，脚本如下：

#!/bin/sh

SDKVERSION="7.1" #这里跟openssl的地方是一个意思

CURRENTPATH=`pwd`
ARCHS="i386 armv7 armv7s arm64"

LIBPATH="${CURRENTPATH}/lib" #这里就是刚才拷贝过来的目录，不要修改，因为librtmp最后生成的也放到了这个下面
INCLUDEPATH="${CURRENTPATH}/include" #这里就是刚才拷贝过来的目录，不要修改，因为librtmp最后生成的也放到了这个下面

LIBRTMPREPO="git://git.ffmpeg.org/rtmpdump"
BUILDPATH="${CURRENTPATH}/build"
SRCPATH="${CURRENTPATH}/src"
LIBRTMP="librtmp.a"
DEVELOPER=`xcode-select -print-path`

if [ ! -d "$DEVELOPER" ]; then
echo "xcode path is not set correctly $DEVELOPER does not exist (most likely because of xcode > 4.3)"
echo "run"
echo "sudo xcode-select -switch <xcode path>"
echo "for default installation:"
echo "sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer"
exit 1
fi

# Check whether openssl has already installed on the machine or not.
# libcrypt.a / libssl.a

set -e
echo ‘Check openssl installation‘
if [ -f "${LIBPATH}/libcrypto.a" ] && [ -f "${LIBPATH}/libssl.a" ] && [ -d "${INCLUDEPATH}/openssl" ]; then
echo ‘Openssl for iOS has already installed, no need to install openssl‘
else
echo ‘Openssl for iOS not found, will install openssl for iOS‘
./build-libssl.sh
echo ‘Succeeded to install openssl‘
fi

# Download librtmp source code from git repository
# We assuem the user already installed git client.
echo ‘Clone librtmp git repository‘

# Remove the directory if already exist
rm -rf "${SRCPATH}/rtmpdump"

git clone ${LIBRTMPREPO} src/rtmpdump
cd "${SRCPATH}/rtmpdump/librtmp"

LIBRTMP_REPO=""

for ARCH in ${ARCHS}
do
if [ "${ARCH}" == "i386" ];
then
PLATFORM="iPhoneSimulator"
else
PLATFORM="iPhoneOS"
fi
export CROSS_TOP="${DEVELOPER}/Platforms/${PLATFORM}.platform/Developer"
export CROSS_SDK="${PLATFORM}${SDKVERSION}.sdk"
export BUILD_TOOLS="${DEVELOPER}"

echo "Building librtmp for ${PLATFORM} ${SDKVERSION} ${ARCH}"
echo "Please wait..."

# add arch to CC=
sed -ie "s!AR=\$(CROSS_COMPILE)ar!AR=/usr/bin/ar!" "Makefile"
sed -ie "/CC=\$(CROSS_COMPILE)gcc/d" "Makefile"
echo "CC=\$(CROSS_COMPILE)gcc -arch ${ARCH}" >> "Makefile"

export CROSS_COMPILE="${DEVELOPER}/usr/bin/"
export XCFLAGS="-isysroot ${CROSS_TOP}/SDKs/${CROSS_SDK} -miphoneos-version-min=7.0 -I${INCLUDEPATH} -arch ${ARCH}"

if [ "${ARCH}" == "i386" ];
then
export XLDFLAGS="-L${LIBPATH} -arch ${ARCH}"
else
export XLDFLAGS="-isysroot ${CROSS_TOP}/SDKs/${CROSS_SDK} -miphoneos-version-min=7.0 -L${LIBPATH} -arch ${ARCH}"
fi
OUTPATH="${BUILDPATH}/librtmp-${PLATFORM}${SDKVERSION}-${ARCH}.sdk"
mkdir -p "${OUTPATH}"
LOG="${OUTPATH}/build-librtmp.log"

make SYS=darwin >> "${LOG}" 2>&1
make SYS=darwin prefix="${OUTPATH}" install >> "${LOG}" 2>&1
make clean >> "${LOG}" 2>&1

LIBRTMP_REPO+="${OUTPATH}/lib/${LIBRTMP} "
done

echo "Build universal library..."
lipo -create ${LIBRTMP_REPO}-output ${LIBPATH}/${LIBRTMP}

mkdir -p ${INCLUDEPATH}
cp -R ${BUILDPATH}/librtmp-iPhoneSimulator${SDKVERSION}-i386.sdk/include/ ${INCLUDEPATH}/

echo "Building done."
echo "Cleaning up..."

rm -rf ${SRCPATH}/rtmpdump
echo "Done."

保存脚本

运行脚本

不出意外就编译成功了。