Building librtmp for iOS

http://www.davideccher.com/blog/wordpress/building-librtmp-for-ios/

I want to describe a detailed command line way to build librtmp and openssl in order to include in an iPhone / iOS project.

You can use this as example to build any other library.

I started from the project from saiten where all this procedure is scripted in build.sh.

We start building openssl. We need to build three version of the library:

• arm6
• arm7
• i386 for simulator

We need three version in order to create a binary compatible with the old devices and i386 for the simulator.

Download the openssl source code. (http://www.openssl.org/source/).

mkdiropenssl

cdopenssl

curl http://www.openssl.org/source/openssl-1.0.0g.tar.gz -O openssl-1.0.0g.tar.gz

tar -xfz openssl-1.0.0g.tar.gz




We’ll build all the release in the tmp folder.
Start to configure it for armv6.





mkdir/tmp/openssl-1.0.0g-armv6

cdopenssl-1.0.0g

./configureBSD-generic32 --openssldir=/tmp/openssl-1.0.0g-armv6

Now we has to edit Makefile and change





#edit Makefile and change

#CC= gcc with CC= /Applications/Xcode.app//Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch armv6

# add to CLAGS: -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.3.sdk

This links are valid for my buildsystem, using SDK 5.0. Change it to  build for other buildsystem.

At this point we are ready to build.

make

makeinstall

Now in /tmp/openssl-1.0.0g-armv6 we have the builded lib.

We do the same for armv7 and i386:

#ARMV7

cd..

mkdir/tmp/openssl-1.0.0g-armv7

rm-fr openssl-1.0.0g

tar -xfz openssl-1.0.0g.tar.gz

cdopenssl-1.0.0g

./configureBSD-generic32 --openssldir=/tmp/openssl-1.0.0g-armv7

#edit Makefile and change

#CC= gcc with CC= /Applications/Xcode.app//Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch armv7

#add to CLAGS: -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.3.sdk

make

makeinstall

 

#i386

mkdir/tmp/openssl-1.0.0g-i386

rm-fr openssl-1.0.0g

tar -xfz openssl-1.0.0g.tar.gz

cdopenssl-1.0.0g

./configureBSD-generic32 --openssldir=/tmp/openssl-1.0.0g-i386

#edit Makefile and change

#CC= gcc with CC= /Applications/Xcode.app//Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch i386

#add to CLAGS: -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.3.sdk

make

makeinstall

At this point we can create an universal library using lipo.

cd..

mkdirinclude

cp-r/tmp/openssl-1.0.0g-i386/include/include/

mkdirlib

 

lipo/tmp/openssl-1.0.0g-armv6/lib/libcrypto.a/tmp/openssl-1.0.0g-armv7/lib/libcrypto.a/tmp/openssl-1.0.0g-i386/lib/libcrypto.a -create -output lib/libcrypto.a

 

lipo/tmp/openssl-1.0.0g-armv6/lib/libssl.a/tmp/openssl-1.0.0g-armv7/lib/libssl.a/tmp/openssl-1.0.0g-i386/lib/libssl.a -create -output lib/libssl.a

Now we have in our include and lib folder the the universal library of openssl.

To build librmtb for ios we build the three version of library like for openssl.

Starting cloning the last release

mkdirlibrtmp

cdlibrtmp

git clone git://git.ffmpeg.org/rtmpdumprtmpdump

To build the armv6 version of library make a copy of the source:

cp-r rtmpdump rtmpdump-armv6

cdrtmpdump-armv6/librtmp

#edit Makefile and set

#CC=$(CROSS_COMPILE)gcc -arch armv6

exportCROSS_COMPILE=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/

exportXCFLAGS="-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -I/tmp/openssl/include/ -arch armv6"

exportXLDFLAGS="-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -L/tmp/openssl/lib -arch armv6 "

makeSYS=darwin

makeSYS=darwin prefix=/tmp/librtmp-armv6install

Change the path to export using the correct system build path  and the path of the openssl lib build before.

For the armv7

cp-r rtmpdump rtmpdump-armv7

cdrtmpdump-armv7/librtmp

#edit Makefile and change

#CC=$(CROSS_COMPILE)gcc -arch armv7

exportCROSS_COMPILE=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/

exportXCFLAGS="-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -I/tmp/openssl/include/ -arch armv7"

exportXLDFLAGS="-isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk -L/tmp/openssl/lib -arch armv7 "

makeSYS=darwin

makeSYS=darwin prefix=/tmp/librtmp-armv7install




For simulator

cd..

cp-r rtmpdump rtmpdump-i386

cdrtmpdump-i386/librtmp

edit Makefile con

CC=$(CROSS_COMPILE)gcc -arch i386

exportCROSS_COMPILE=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/

exportXCFLAGS="-isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -I/tmp/openssl/include/ -arch i386"

exportXLDFLAGS="-isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/tmp/openssl/lib -arch i386 "

makeSYS=darwin

makeSYS=darwin prefix=/tmp/librtmp-i386install

At this point we can create an universal library using lipo.

mkdirinclude

cp-r/tmp/librtmp-i386/include/librtmpinclude/

mkdirlib

lipo/tmp/librtmp-armv6/lib/librtmp.a/tmp/librtmp-armv7/lib/librtmp.a/tmp/librtmp-i386/lib/librtmp.a -create -output lib/librtmp.a