--- trunk/xvidcore/src/dct/x86_asm/idct_mmx.asm 2002/11/16 23:51:58 649 +++ trunk/xvidcore/src/dct/x86_asm/idct_mmx.asm 2003/02/15 15:22:19 851 @@ -1,73 +1,25 @@ -;/***************************************************************************** -; * -; * XVID MPEG-4 VIDEO CODEC -; * mmx version - inverse discrete cosine transformation -; * -; * Initial version provided by Intel at AppNote AP-922 -; * Copyright (C) 1999 Intel Corporation, -; * -; * Modifications -; * Copyright (c) 2000-2001 Peter Gubanov -; * Copyright (c) 2000 Michel Lespinasse -; * -; * ported to NASM and some minor changes -; * Copyright (C) 2001 Peter Ross -; * -; * This file is part of XviD, a free MPEG-4 video encoder/decoder -; * -; * XviD is free software; you can redistribute it and/or modify it -; * under the terms of the GNU General Public License as published by -; * the Free Software Foundation; either version 2 of the License, or -; * (at your option) any later version. -; * -; * This program is distributed in the hope that it will be useful, -; * but WITHOUT ANY WARRANTY; without even the implied warranty of -; * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -; * GNU General Public License for more details. -; * -; * You should have received a copy of the GNU General Public License -; * along with this program; if not, write to the Free Software -; * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -; * -; * Under section 8 of the GNU General Public License, the copyright -; * holders of XVID explicitly forbid distribution in the following -; * countries: -; * -; * - Japan -; * - United States of America -; * -; * Linking XviD statically or dynamically with other modules is making a -; * combined work based on XviD. Thus, the terms and conditions of the -; * GNU General Public License cover the whole combination. -; * -; * As a special exception, the copyright holders of XviD give you -; * permission to link XviD with independent modules that communicate with -; * XviD solely through the VFW1.1 and DShow interfaces, regardless of the -; * license terms of these independent modules, and to copy and distribute -; * the resulting combined work under terms of your choice, provided that -; * every copy of the combined work is accompanied by a complete copy of -; * the source code of XviD (the version of XviD used to produce the -; * combined work), being distributed under the terms of the GNU General -; * Public License plus this exception. An independent module is a module -; * which is not derived from or based on XviD. -; * -; * Note that people who make modified versions of XviD are not obligated -; * to grant this special exception for their modified versions; it is -; * their choice whether to do so. The GNU General Public License gives -; * permission to release a modified version without this exception; this -; * exception also makes it possible to release a modified version which -; * carries forward this exception. -; * -; * $Id: idct_mmx.asm,v 1.5 2002-11-16 23:51:58 edgomez Exp $ -; * -; *************************************************************************/ - +; Originally provided by Intel at AP-922 +; http://developer.intel.com/vtune/cbts/strmsimd/922down.htm +; (See more app notes at http://developer.intel.com/vtune/cbts/strmsimd/appnotes.htm) +; but in a limited edition. +; New macro implements a column part for precise iDCT +; The routine precision now satisfies IEEE standard 1180-1990. +; +; Copyright (c) 2000-2001 Peter Gubanov +; Rounding trick Copyright (c) 2000 Michel Lespinasse +; +; http://www.elecard.com/peter/idct.html +; http://www.linuxvideo.org/mpeg2dec/ +; ;============================================================================= ; ; These examples contain code fragments for first stage iDCT 8x8 ; (for rows) and first stage DCT 8x8 (for columns) ; ;============================================================================= +; +; 04.11.2001 nasm conversion; peter ross +; bits 32