Beyond Linux® From Scratch (systemd Edition) - Version r12.0-816

Chapter 42. Multimedia Libraries and Drivers

Liba52-0.7.4

Introduction to Liba52

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.

[Note]

Note

Development versions of BLFS may not build or run some packages properly if LFS or dependencies have been updated since the most recent stable versions of the books.

Package Information

Optional

djbfft

Editor Notes: https://wiki.linuxfromscratch.org/blfs/wiki/liba52

Installation of Liba52

Install liba52 by running the following commands: 

./configure --prefix=/usr           \
            --mandir=/usr/share/man \
            --enable-shared         \
            --disable-static        \
            CFLAGS="${CFLAGS:--g -O2} $([ $(uname -m) = x86_64 ] && echo -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

Command Explanations

CFLAGS="-g -O2 ...: This sets CFLAGS to -g -O2 (which is the default) but then on x86_64 adds -fPIC. This is needed to compile liba52 on x86_64.

--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.

Contents

Installed Programs: a52dec and extract_a52
Installed Library: liba52.so
Installed Directories: /usr/include/a52dec and /usr/share/doc/liba52-0.7.4

Short Descriptions

a52dec

plays ATSC A/52 audio streams

extract_a52

extracts ATSC A/52 audio from an MPEG stream

liba52.so

provides functions for the programs dealing with ATSC A/52 streams