Dependency graph
================

The complete Themyscira GSM codec libraries & utilities package as presented
here consists of two principal parts:

Division 1: libgsmefr and libgsmfrp, the two C code libraries intended to be
usable by other software;

Division 2: various command line utilities that were developed under the
umbrella of this project and are being released accordingly.

Division 2 components have a compile-time dependency on Division 1 (some of
these Division 2 command line utilities link with libgsmefr or libgsmfrp), but
not the other way around: neither libgsmefr nor libgsmfrp has any dependency on
any other part of this package.

However, the original GSM 06.10 library (libgsm) from 1990s is a required
dependency for several components of the present Themyscira package: libgsmfrp
and several Division 2 command line utilities have a compile-time dependency on
<gsm.h> header file provided by libgsm, and several Division 2 utilities also
have a link dependency on libgsm itself.  Therefore, libgsm should be considered
a hard dependency for the present GSM codec libraries & utilities package as a
whole, and it needs to be installed system-wide prior to compiling the present
software.

Compiling and installing Themyscira libraries and utilities
===========================================================

Running 'make' at the top level of the present gsm-codec-lib package will
compile both Division 1 and Division 2 software components (both libraries and
utilities), with the top level Makefile codifying the dependency graph among
them.  Installation, however, is a little more complicated in that there is no
single 'make install' target at the top level - instead of a single install
target, the top Makefile provides two separate installation targets:

make install-lib	Install libgsmefr and libgsmfrp system-wide:
			gsm_efr.h and gsm_fr_preproc.h are installed in
			/usr/local/include; libgsmefr.a and libgsmfrp.a are
			installed in /usr/local/lib.  Superuser privileges
			are usually required to write to these directories.

make install-utils	Install Division 2 command line utilities into
			/opt/freecalypso/bin directory, which is non-standard
			in the muggle world but has been established in our
			Themyscira community as the location for Themyscira-
			developed command line utilities working with GSM.

The just-described separation between install-lib and install-utils targets has
been created because of the difference in install paths: libraries and their
header files that need to be easily findable and usable by other people's
unrelated software need to be installed under /usr/local, requiring su to root
before each install cycle, whereas /opt/freecalypso/bin (writable without root
privileges on the Mother's development machine) is much more convenient for
Division 2 command line utilities.

However, the present gsm-codec-lib package differs from FreeCalypso host tools
and SIM tools packages in that in the present package, you ARE allowed to freely
change these installation directories to fit your own preferences.  FC host
tools and FC SIM tools packages carry very strong admonitions in their INSTALL
documents to the effect that they MUST be installed under /opt/freecalypso and
that this path cannot be changed; this strict imposition is made because of
strong intercomponent dependencies within those software suites, with different
components invoking each other or looking for their support files using hard-
coded absolute pathnames.  But the present gsm-codec-lib package is different:
you are free to move our Division 2 command line utilities from
/opt/freecalypso/bin to /usr/local/bin or anywhere else you like, and you are
likewise free to move our Division 1 libraries from /usr/local/{include,lib} to
whatever location would be most appropriate in your environment.

To change installation directories, you will need to edit subdirectory Makefiles
as follows:

Division 1:

	libgsmefr/Makefile
	libgsmfrp/Makefile

Division 2:

	amrconv/Makefile
	efrtest/Makefile
	frtest/Makefile
	miscutil/Makefile
	pcap/Makefile

pcap subdirectory and libpcap dependency
========================================

The present package includes (as part of Division 2) a set of command line
utilities for analyzing RTP streams that have been captured with tcpdump or
equivalent tools in pcap format.  These utilities, described in the
doc/RTP-analysis article, are built in the pcap subdirectory and naturally
depend on libpcap.  If your system lacks libpcap and you don't need these RTP
analysis utilities, you can edit the top level Makefile and remove pcap from
the list in SUBDIR_UTILS.