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OpenH323 Library
================
The OpenH323 project aims to create a full featured, interoperable, Open
Source implementation of the ITU H.323 teleconferencing protocol that can be
used by personal developers and commercial users without charge.
OpenH323 development is coordinated by an Australian company, Equivalence Pty
Ltd (http://www.equival.com), but is open to any interested party. Commercial
and private use of the OpenH323 code, including use in commercial products
and resale, is enouraged through use of the MPL (Mozilla Public license).
For more details see http://www.openh323.org
You can subscribe to the mailing list at http://www.openh323.org/mailman/listinfo
Frequently asked questions are answered at http://www.openh323.org/faq.html
Building the OpenH323 Code
==========================
This page describes how to compile the OpenH323 code release. Note these
instructions will always refer to the latest snapshot available on the
download page.
The OpenH323 source will have been compiled and tested under Linux x86, and
Windows NT. If it does not compile for you then the problem is likely to be a
setup/configuration problem with your system and not a problem with the
source code itself.
The libraries and applications should also compile on Windows 95/98, BeOS
(thanks Yuri!), Linux PPC, FreeBSD x86, OpenBSD x86 (thanks Roger!) and
Solaris Sparc & x86. They are not automatically compiled on every release
however so there could be problems, but the chances are that there aren't.
Note also that not all of these platforms may have ports of the sound
interface.
We are also happy to port it to other Unix flavours providing people out
there can provide an account and a fair bit of disk space!
These instructions should contain all of the steps need. If you have a problem,
please double check that you have performed ALL of the steps below,
particularly setting the include file paths under MSVC. Some of the more
common errors are described below.
If you get a lot of compile or link errors, then the chances are that you
have missed something in the list. If you are positive that something is
wrong and you have followed the instructions, then send an e-mail to the
mailing list, and we'll answer it for everyone to see. Bear in mind that the
first question asked will be "did you follow the instructions".
Windows
-------
1. Download the pwlib_1.xx.zip and openh323_1.x.zip files from the OpenH323
download page.
2. Follow the instructions for building PWLib.
3. Start MSVC (v5 or v6). If you have another compiler you are on your own!
Go into the Tools menu, Options item, Directories tab and add to the
beginning of the Include files path (note the order is important!):
C:\OpenH323\Include
and add to the Lib Files path and the Executable Files path the following:
C:\OpenH323\Lib
Also make sure the last directory is in your PATH environment variable.
Note this is in addition to the ones in PWLib!!
4. Use the OpenH323.dsw file to build the sample code, eg SimpH323.
The build should automatically create a file openh323/include/openh323buildopts.h
via the configure.exe program that should be in the openh323 directory. If
you have any problems try running the program directly from a command
line. Use ".\configure --help" to get information on options such as
forcing a feature or library dependency.
Note there are additional notes in the "Platform Specific Issues" on how
to compile the various libraries in a manner suitable for use by OpenH323
under Windows.
5. Run the program, and you are on your own!
Unix
----
1. Download the pwlib_min_1.xx.tar.gz and openh323_1.xx.tar.gz files from
the OpenH323 download page.
2. Follow the instructions for building PWLib.
3. Extract the contents of the openh323_1.x.tar.gz file somewhere, eg:
cd
tar -xzvf openh323_1.1alpha1.tar.gz
4. If you have not installed OpenH323 in your home directory (~/openh323)
then you will have to define the environment variable OPENH323DIR to
point to the correct directory.
Also make sure you have added the $OPENH323DIR/lib directory to your
LD_LIBRARY_PATH environment variable if you intend to use shared libraries
(the default under Linux).
There are examples for sh/bash and csh/tcsh below.
5. Build the H323 bootstrap code. This will automatically build the ASN
compiler (in the $PWLIBDIR/tools/asnparser directory), though this should
have already been built previously. Enter:
cd $(OPENH323DIR)
./configure
make opt
This may take some time, especially with the h245_*.cxx and h225.cxx
files. You may also need to add more swap space - 64M of real memory and
64M of swap might just be enough, if your machine does nothing else! Some
people have reported needing as much as 256M of swap - if your compiler
bombs out with a "virtual memory exhausted" error compiling h245_*.cxx
and h225.cxx, then increase your swap space.
Less space is required if you build the debug version - Debug builds on 64M ram are
very achievable. Opt builds on 164M ram are doable, but only just.
6. The result should be an executable called simph323, which will be located
in a directory dependent on the platform, eg sample/simple/obj_linux_x86_d.
To run it, use the following command:
./sample/simple/obj_linux_x86_r/simph323
and you should get the usage help text.
9. Now you're on your own!
Voice Age G.729 Codec
---------------------
For the Windows system it is possible to also have a G.729 codec
for non-commercial use by adding the Voice Age G.729A library to the system.
To do this:
1. Get the Voice Age G.729 library from http://www.voiceage.com/g729/
2. Unpack it somewhere, preferably at teh same level as OpenH323, eg if
c:\work\openh323, then c:\work\va_g729a
3. Re-run the configure program.
4. Recompile your project.
H263 Support.
=============
H263 is a video compression format which is especially suited for low
bandwidth situations, such as a dial up link. By adding the requisite
library, recompiling openh323 and ohphone applications, H263 support is
available.
Two H263 codecs are in the Openh323 codebase.
1)ffmpeg, and 2)vich263
1)ffmpeg.
Note that the H.263 support in OpenH323 is not yet compliant with RFC 2190,
which means it is not yet interoperable with applications like NetMeeting.
OpenH323 implemented H263 using the ffmpeg library, which does NOT use the
same license as OpenH323. Please read the license information at
http://ffmpeg.sourceforge.net to ensure that your usage of this code is
allowed.
OpenH323 has labelled the H263 support from ffmpeg as non standard. Some non
standard hacks were added to the packets generated by ffmpeg to get it working
in a voip environment.
To be absolutely certain of no license problems from ffmpegs LGPL/GPL, ffmpeg
is dynamically opened by openh323 at run time with dlopen.
2)vich263
is more compliant than the ffmpeg version.
Andrew Morrow who did the hard part of the implementation reports that:
I got something working using vic's H.263 (not plus) in OpenH323.
It does not interoperate with NetMeeting, but it does interoperate with
IBM's J323/JMF.
Unix
----
The library was built with
cd external/ffmpeg
./configure --enable-shared --disable-a52
cd libavcodec
make
make install
The code is in the CVS, external/ffmpeg directory at sourceforge.
Instructions on using the cvs are at http://sourceforge.net/cvs/?group_id=80674
cd external/vich263
make
make install
====
If you have the external directory on your box, with vich263 and ffmpeg, but do
not wish to enable ffmpeg or vich263, you can
cd openh323
/configure
make
on recompiling the openh323 directory, you will not do configure again, so
your ffmpeg and vich263 settings will remain.
Should you wish to build in support for both H263 codecs, do:
export H323_VICH263=1
export H323_AVCODEC=1
cd openh323
/configure
make
Now, if you just want 1 codec, just have the appropriate export statement.
Note that when you do ./configure, there is a clear statement what codec is on.
If you wish to remove both codecs, (after doing a configure with them on), do
export H323_VICH263=""
export H323_AVCODEC=""
cd openh323
/configure
make
Now, these settings are fixed, and remain in place on subsequent makes. Thus,
on recompiling the openh323 dir, you don't need to rerun configure.
Now, to test the operation of the H263 codec. I used the command below in
the ohphone directory:
./obj_linux_x86_r/ohphone -ln --videotest --videolocal \
--videoreceive sdl --videodevice fake --videoinput 1 \
--videobitrate 24
This brings up a SDL display window with two copies of the same image. The
image on the right is generated by the fake video device, on channel 1.
The image on the left is the decoded form of an image that has been
encoded with H263.
Wait a while, and then type q, the display will tell you what bit rate
was achieved, and the frame rate. The achieved bit rate should always be
less than that specified in the --videobitrate option
Now, you can try the H261 codec instead. To use H261, add to the command
line -D 263, so your command line becomes:
./obj_linux_x86_r/ohphone -ln --videotest --videolocal \
--videoreceive sdl --videodevice fake --videoinput 1 \
--videobitrate 24 -D 263
Get mean, set a bit rate of 12 Kilobits/sec
Now, you might have a problem with it not finding the libavcodec.so library.
In this case, you need to extend your LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
or append to /etc/ld.so.conf the directory /usr/local/lib and rerun ldconfig
ldconfig -C /etc/ld.so.conf Do this command as root.
Alternatively, append to the configure command above the phrase
--prefix=/usr. This will cause all the ffmpeg stuff to go in system
directories, where it will be found guaranteed.
Windows
-------
The ffmpeg codec is built with MingW. There have been some valiant efforts to get ffmpeg
to build under msvc. However, many many code changes were required. Consequently, the code
became not standard with the source code.
1) move ffmpeg directory
from c:\external to c:\msys\1.0\home\administrator
2) start msys
3) cd ffmpeg
4) do
./configure --cc="gcc -mno-cygwin -mms-bitfields" --with-mingw32 "gcc -mno-cygwin -mms-bitfields"
--enable-shared --disable-a52 --disable-ffserver --disable-ffplay
this configure command is in external/ffmpeg/windows file
5) cd libavcodec
6) make
(don't worry about the message about symbols)
7) exit msys (just type exit)
8) move ffmpeg back to c:\external (opposite of step 1)
9) move c:\external\ffmpeg\libavcodec.dll to c:\openh323\lib
10) compile libvich263
Simply go to external\vich263
open the libvich263 workspace.
select batch build, buld release and debug.
leave libvich263.lib where it puts this library.
11) Open up a dos terminal
go to c:\openh323
configure
Check that options are set correctly in
c:\openh323\include\openh323buildopts.h
(note, openh323buildopts.h is from openh323buildopts.h.in)
If it fails to build openh323buildopts.h, well, it is OK.
copy from pwlib/tools/configure the files configure.cpp and configure.dsp
to the directory c:\openh323
Open configure.dsp project in msvc, build and run configure.exe
recompile the OpenH323Lib and OpenH323DLL
projects to create new OpenH323 libraries.
Common errors
-------------
Here are common errors you might encounter for both Windows and Unix builds.
An error like:
"Makefile", line 175: Missing dependency operator
"Makefile", line 177: Need an operator
"Makefile", line 179: Missing dependency operator
"Makefile", line 181: Need an operator
"Makefile", line 183: Missing dependency operator
"Makefile", line 185: Need an operator
Indicates you are using BSD Unix's Make command. You need to use
gmake (GNU Make).
Thinking there are missing files.
A number of files, eg h235.h, h225.h etc, are generated files that are
created during the build process. If they are missing then something
went wrong with the creation of the asnparser or your installation of
flex/bison.
An error like:
/home/newbie/pwlib/tools/asnparser/obj_linux_x86_r/asnparser: error in loading
shared libraries: libpt_linux_x86_r.so.1: cannot open shared object file: No
such file or directory
Indicates you have not set the LD_LIBRARY_PATH environment variable.
There are examples for sh/bash and csh/tcsh.
An error like:
Linking...
LINK : fatal error LNK1181: cannot open input file "ptlib.lib"
Error executing link.exe.
Indicates you have not set the paths in MSVC directories.
An error like:
Performing Bison Step
c:\tools\share\bison.simple: No such file or directory
C:\PWLIB\TOOLS\ASNPAR~1\BISON.EXE: Cannot move asn_grammar_tab.c - No such file or directory
Cannot move asn_grammar_tab.h - No such file or directory
Indicates you have not installed bison correctly. In particular the
bison.simple file must be available to bison. Check the bison
documentation for details on this.
Attempting to compile GUI systems under Unix.
There are a number of partial implementations of the GUI code in the
$PWLIBDIR/src/pwlib directory tree. These are not required to get the
OhPhone application compiled. If you get those systems from the CVS
then you are basically on your own. Do not ask for support unless you
intend to help with the implementation!
See the FAQ at http://www.openh323.org/~openh323/fom.cgi for more.
Example environment for sh/bash
-------------------------------
PWLIBDIR=$HOME/pwlib
export PWLIBDIR
OPENH323DIR=$HOME/openh323
export OPENH323DIR
LD_LIBRARY_PATH=$PWLIBDIR/lib:$OPENH323DIR/lib
export LD_LIBRARY_PATH
Example environment for csh/tcsh:
setenv PWLIBDIR $HOME/pwlib
setenv OPENH323DIR $HOME/openh323
setenv LD_LIBRARY_PATH $PWLIBDIR/lib:$OPENH323DIR/lib
Bison problem under Unix
------------------------
The bison.simple file on many releases will not compile with the options used
by the PWLib getdate.y grammar. The options are required to make the date
parser thread safe so it is necessary to edit the bison.simple file to fix
the problem.
The file is usually at /usr/lib/bison.simple but in the tradition of unix
could actually be anywhere. We leave it up to you to find it.
The code:
/* Prevent warning if -Wstrict-prototypes. */
#ifdef __GNUC__
int yyparse (void);
#endif
should be changed to
/* Prevent warning if -Wstrict-prototypes. */
#ifdef __GNUC__
#ifndef YYPARSE_PARAM
int yyparse (void);
#endif
#endif
To prevent the incorrect function prototype from being defined. The getdate.y
should then produce a getdate.tab.c file that will actually compile.
Licensing
---------
The bulk of this library is licensed under the MPL (Mozilla Public License)
version 1.0. In simple terms this license allows you to use the library for
any purpose, commercial or otherwise, provided the library is kept in tact
as a separate entity and any changes made to the library are made publicly
available under the same (MPL) license. It is important to realise that that
refers to changes to the library and not your application that is merely
linked to the library.
Note that due to a restriction in the GPL, any application you write that
uses anything another than GPL, eg our library with MPL, is technically in
breach of the GPL license. However, it should be noted that MPL does not
care about the license of the final application, and as only the author of
the GPL application is in breach of his own license and is unlikely to sue
themselves for that breach, in practice there is no problem with a GPL
application using an MPL or any other commercial library.
Portions of this library are derived from TOAST, using the copyright:
Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann,
Technische Universitaet Berlin
Any use of this software is permitted provided that this notice is not
removed and that neither the authors nor the Technische Universitaet Berlin
are deemed to have made any representations as to the suitability of this
software for any purpose nor are held responsible for any defects of
this software. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
As a matter of courtesy, the authors request to be informed about uses
this software has found, about bugs in this software, and about any
improvements that may be of general interest.
Portions of this library is derived from vic, http://www-nrg.ee.lbl.gov/vic/
Their copyright notice is below.
* Copyright (c) 1993-1995 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Network Research
* Group at Lawrence Berkeley National Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
__oo^oo__