liba52 is a free library for decoding ATSC A/52 (also known as AC-3) streams. The A/52 standard is used in a variety of applications, including digital television and DVD.
This package is known to build and work properly using an LFS 12.1 platform.
Download (HTTP): http://ftp.osuosl.org/pub/blfs/conglomeration/a52dec/a52dec-0.7.4.tar.gz
Download MD5 sum: caa9f5bc44232dc8aeea773fea56be80
Download size: 236 KB
Estimated disk space required: 2.5 MB
Estimated build time: less than 0.1 SBU
Editor Notes: https://wiki.linuxfromscratch.org/blfs/wiki/liba52
Install liba52 by running the following commands:
./configure --prefix=/usr \
--mandir=/usr/share/man \
--enable-shared \
--disable-static \
CFLAGS="${CFLAGS:--g -O3} -fPIC" &&
make
To test the results, issue: make check.
Now, as the root user:
make install &&
cp liba52/a52_internal.h /usr/include/a52dec &&
install -v -m644 -D doc/liba52.txt \
/usr/share/doc/liba52-0.7.4/liba52.txt
CFLAGS="${CFLAGS:--g -O3}
-fPIC": This appends -fPIC
to CFLAGS but use -g -O3 (the default of this package) instead of an
empty string when CFLAGS is not set.
This is needed to compile liba52
without runtime text relocation. Runtime text relocation is
prohibited on x86_64 so -fPIC is
strictly required. On 32-bit x86 runtime text relocation is allowed
but it's insecure and it may waste physical RAM, so -fPIC is still better.
--disable-static: This
switch prevents installation of static versions of the libraries.
cp liba52/a52_internal.h ...: Copying this header file into /usr/include/a52dec allows some other programs (such as xine-lib) to compile and link against a system installed liba52.