h261codec.cxx

sloedgy open sip stack source code

/*
 * h261codec.cxx
 *
 * H.323 protocol handler
 *
 * Open H323 Library
 *
 * Copyright (c) 1998-2000 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Open H323 Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Contributor(s): Michele Piccini ([e-mail])
 *                 Derek Smithies ([e-mail])
 *
 * $Log: h261codec.cxx,v $
 * Revision 1.2  2007/06/04 16:06:30  joegenbaclor
 * *** empty log message ***
 *
 * Revision 1.1  2006/06/26 03:02:34  joegenbaclor
 * I have decided to include the latest development realease  of OPAL tagged Deimos Devel 1 (June 8 2006) as inegrated classes to opensipstack to avoid future version conflicts due to the fast pace in OPAL development.   This move is also aimed to reduce the size of projects using OPAL componets such as the soon to be relased OpenSIPPhone.
 *
 * Revision 2.28  2006/01/12 17:54:01  dsandras
 * Added check for commandNotifier before calling it, prevents assert.
 *
 * Revision 2.27  2006/01/02 16:34:24  dsandras
 * Fixed compilation warning.
 *
 * Revision 2.26  2005/10/22 10:29:04  dsandras
 * Removed FIXME.
 *
 * Revision 2.25  2005/09/15 20:01:23  dsandras
 * Allow dynamic quality adjustments.
 *
 * Revision 2.24  2005/09/15 19:24:15  dsandras
 * Backported adaptative packet delay algorithm from OpenH323.
 *
 * Revision 2.23  2005/09/06 12:44:49  rjongbloed
 * Many fixes to finalise the video processing: merging remote media
 *
 * Revision 2.22  2005/09/04 06:23:39  rjongbloed
 * Added OpalMediaCommand mechanism (via PNotifier) for media streams
 *   and media transcoders to send commands back to remote.
 *
 * Revision 2.21  2005/08/31 13:19:25  rjongbloed
 * Added mechanism for controlling media (especially codecs) including
 *   changing the OpalMediaFormat option list (eg bit rate) and a completely
 *   new OpalMediaCommand abstraction for things like video fast update.
 *
 * Revision 2.20  2005/08/28 07:59:17  rjongbloed
 * Converted OpalTranscoder to use factory, requiring sme changes in making sure
 *   OpalMediaFormat instances are initialised before use.
 *
 * Revision 2.19  2005/08/24 10:15:10  rjongbloed
 * Fixed missing marker bit on codec output, get more than just the first frame!
 *
 * Revision 2.18  2005/08/23 12:46:27  rjongbloed
 * Fix some decoder issues, now get inital frame displayed!
 *
 * Revision 2.17  2005/08/20 09:01:56  rjongbloed
 * H.261 port to OPAL model
 *
 * Revision 2.16  2005/02/24 19:49:44  dsandras
 * Applied patch from Hannes Friederich to fix quality problem in some circumstances.
 *
 * Revision 2.15  2005/02/21 12:19:53  rjongbloed
 * Added new "options list" to the OpalMediaFormat class.
 *
 * Revision 2.14  2004/04/07 08:21:00  rjongbloed
 * Changes for new RTTI system.
 *
 * Revision 2.13  2004/03/11 06:54:28  csoutheren
 * Added ability to disable SIP or H.323 stacks
 *
 * Revision 2.12  2004/02/19 10:47:02  rjongbloed
 * Merged OpenH323 version 1.13.1 changes.
 *
 * Revision 2.11  2004/01/18 15:35:20  rjongbloed
 * More work on video support
 *
 * Revision 2.10  2003/03/17 10:26:59  robertj
 * Added video support.
 *
 * Revision 2.9  2003/01/07 04:39:53  robertj
 * Updated to OpenH323 v1.11.2
 *
 * Revision 2.8  2002/11/10 11:33:18  robertj
 * Updated to OpenH323 v1.10.3
 *
 * Revision 2.7  2002/09/04 06:01:47  robertj
 * Updated to OpenH323 v1.9.6
 *
 * Revision 2.6  2002/07/01 04:56:31  robertj
 * Updated to OpenH323 v1.9.1
 *
 * Revision 2.5  2002/01/22 05:18:59  robertj
 * Added RTP encoding name string to media format database.
 * Changed time units to clock rate in Hz.
 *
 * Revision 2.4  2002/01/14 06:35:57  robertj
 * Updated to OpenH323 v1.7.9
 *
 * Revision 2.3  2001/11/02 10:45:19  robertj
 * Updated to OpenH323 v1.7.3
 *
 * Revision 2.2  2001/10/05 00:22:13  robertj
 * Updated to PWLib 1.2.0 and OpenH323 1.7.0
 *
 * Revision 2.1  2001/08/01 05:04:28  robertj
 * Changes to allow control of linking software transcoders, use macros
 *   to force linking.
 * Allowed codecs to be used without H.,323 being linked by using the
 *   new NO_H323 define.
 * Major changes to H.323 capabilities, uses OpalMediaFormat for base name.
 *
 * Revision 2.0  2001/07/27 15:48:24  robertj
 * Conversion of OpenH323 to Open Phone Abstraction Library (OPAL)
 *
 * Revision 1.59  2004/01/02 00:31:42  dereksmithies
 * Fix test on presence/absence of video.
 *
 * Revision 1.58  2003/12/14 10:42:29  rjongbloed
 * Changes for compilability without video support.
 *
 * Revision 1.57  2003/10/02 23:37:56  dereksmithies
 * Add fix for fast update problem in h261 codec. Thanks to Martin Andr