SDL Multimedia Library

SDL Multimedia Library

SDL is a cross platform multimedia library provide access to low level system hardware and many applications use to operate on MPEG playback.

Since it is a low level software it is usually require as a dependency library to build on other multimedia applications on our device, such as webcam and etc.

Download a copy from SDL and unzip file.

Configure the package and then compile it.

./configure --host=arm-linux --prefix=/usr --sysconfdir=/etc --libdir=/lib --datadir=/usr/share --disable-video-x11 --disable-alsatest --disable-esdtest --disable-arts LDFLAGS="-L/rootfs/lib" CPPFLAGS="-I/rootfs/usr/include"
make


Install into a temporary directory.

make install DESTDIR=/install/SDL-1.2.14


There are 2 directories lib and usr created.

Copy the libraries and header files to our root filesystem.

cp /install/SDL-1.2.14/lib/libSDL* .
cp /install/SDL-1.2.14/lib/pkgconfig/sdl.pc ./pkgconfig
cp /install/SDL-1.2.14/usr/bin/sdl-config /usr/local/arm/4.4.1/bin
cd ../usr/include
cp -r /install/SDL-1.2.14/usr/include/* .


Note, the sdl-config is a shell script which move to our cross-compiler bin directory because it is related to our target-compiled environment.

Modify the /rootfs/lib/libSDL.la libtool library file to point to our root directory.

libdir='/rootfs/lib'

Modify the library reference of sdl.pc in /rootfs/lib/pkgconfig directory as shown below.

prefix=/rootfs
exec_prefix=${prefix}
libdir=${prefix}/lib
includedir=${prefix}/usr/include

Modify the sdl-config script as below.
- change /usr to /rootfs
- change ${prefix}/include to ${prefix}/usr/include
- change /lib to ${prefix}/lib


Now, compile the testing program.

Go to test directory in /opt/SDK-1.2.14/test and configure the package.

./configure --host=arm-linux --prefix=/usr --sysconfdir=/etc --libdir=/lib --datadir=/usr/share LDFLAGS="-L/rootfs/lib" CPPFLAGS="-I/rootfs/usr/include"


Modify the Makefile.
- change the include path to start with our root directory eg. /rootfs
- change the lib path to start with -L/rootfs/lib and append -L/rootfs/lib -Wl,-rpath-link,/rootfs/lib


Compile it.

make

Finally, copy the test program to the board for testing (refer to the test/README for a list of the test program description)

I will test the testalpha program.

cd /opt/SDL-1.2.14/test
cp testalpha /rootfs/usr/local/bin
cp icon.bmp /rootfs/usr/local/bin


Restart the board to test the program.

cd /usr/local/bin
testalpha -width 240 -height 320

The above will show a smiley face and you can move it with the pen around the screen.