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Revision 655 - (download) (annotate)
Sun Nov 17 00:57:58 2002 UTC (18 years, 11 months ago) by edgomez
File size: 3599 byte(s)
License changed
/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - cbp function (zero block flags) -
 *
 *  Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@wanadoo.fr>
 *
 *  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: cbp.c,v 1.8 2002-11-17 00:57:57 edgomez Exp $
 *
 ****************************************************************************/

#include "../portab.h"
#include "cbp.h"

/*****************************************************************************
 * Global function pointer
 ****************************************************************************/

cbpFuncPtr calc_cbp;

/*****************************************************************************
 * Functions
 ****************************************************************************/

/*
 * Returns a field of bits that indicates non zero ac blocks
 * for this macro block
 */
uint32_t
calc_cbp_c(const int16_t codes[6 * 64])
{
	uint32_t i, j;
	uint32_t cbp = 0;

	for (i = 0; i < 6; i++) {
		for (j = 1; j < 61; j += 4) {
			if (codes[i * 64 + j] | codes[i * 64 + j + 1] |
				codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) {
				cbp |= 1 << (5 - i);
				break;
			}
		}

		if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2])
			cbp |= 1 << (5 - i);

	}

	return cbp;

}

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