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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* - Adaptive quantization functions - |
* - Adaptive quantization functions - |
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* |
* |
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* Copyright(C) 2002 Peter Ross |
* Copyright(C) 2002 Peter Ross <pross@xvid.org> |
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* 2002 Christoph Lampert <gruel@web.de> |
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* |
* |
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* This program is an implementation of a part of one or more MPEG-4 |
* This file is part of XviD, a free MPEG-4 video encoder/decoder |
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* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
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* to use this software module in hardware or software products are |
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* advised that its use may infringe existing patents or copyrights, and |
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* any such use would be at such party's own risk. The original |
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* developer of this software module and his/her company, and subsequent |
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* editors and their companies, will have no liability for use of this |
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* software or modifications or derivatives thereof. |
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* |
* |
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* This program is free software ; you can redistribute it and/or modify |
* XviD is free software; you can redistribute it and/or modify it |
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* it under the terms of the GNU General Public License as published by |
* under the terms of the GNU General Public License as published by |
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* the Free Software Foundation ; either version 2 of the License, or |
* the Free Software Foundation ; either version 2 of the License, or |
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* (at your option) any later version. |
* (at your option) any later version. |
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* |
* |
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* along with this program ; if not, write to the Free Software |
* along with this program ; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
* |
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* $Id: adapt_quant.c,v 1.9 2002-09-20 20:17:22 edgomez Exp $ |
* Under section 8 of the GNU General Public License, the copyright |
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* holders of XVID explicitly forbid distribution in the following |
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* countries: |
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* |
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* - Japan |
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* - United States of America |
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* |
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* Linking XviD statically or dynamically with other modules is making a |
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* combined work based on XviD. Thus, the terms and conditions of the |
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* GNU General Public License cover the whole combination. |
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* |
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* As a special exception, the copyright holders of XviD give you |
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* permission to link XviD with independent modules that communicate with |
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* XviD solely through the VFW1.1 and DShow interfaces, regardless of the |
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* license terms of these independent modules, and to copy and distribute |
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* the resulting combined work under terms of your choice, provided that |
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* every copy of the combined work is accompanied by a complete copy of |
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* the source code of XviD (the version of XviD used to produce the |
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* combined work), being distributed under the terms of the GNU General |
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* Public License plus this exception. An independent module is a module |
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* which is not derived from or based on XviD. |
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* |
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* Note that people who make modified versions of XviD are not obligated |
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* to grant this special exception for their modified versions; it is |
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* their choice whether to do so. The GNU General Public License gives |
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* permission to release a modified version without this exception; this |
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* exception also makes it possible to release a modified version which |
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* carries forward this exception. |
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* |
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* $Id: adapt_quant.c,v 1.13 2002-11-26 23:44:11 edgomez Exp $ |
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* |
* |
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****************************************************************************/ |
****************************************************************************/ |
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int min_quant, |
int min_quant, |
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int max_quant, |
int max_quant, |
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int mb_width, |
int mb_width, |
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int mb_height) // no qstride because normalization |
int mb_height) /* no qstride because normalization */ |
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{ |
{ |
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int i, j, k, l; |
int i, j, k, l; |
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} |
} |
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for (k = 0; k < mb_height; k++) { |
for (k = 0; k < mb_height; k++) { |
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for (l = 0; l < mb_width; l++) // do this for all macroblocks individually |
for (l = 0; l < mb_width; l++) /* do this for all macroblocks individually */ |
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{ |
{ |
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quant[k * mb_width + l] = (float) framequant; |
quant[k * mb_width + l] = (float) framequant; |
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// calculate luminance-masking |
/* calculate luminance-masking */ |
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ptr = &buf[16 * k * stride + 16 * l]; // address of MB |
ptr = &buf[16 * k * stride + 16 * l]; /* address of MB */ |
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val[k * mb_width + l] = 0.; |
val[k * mb_width + l] = 0.; |
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if (((global <GlobalBrightThres) &&(global >GlobalDarkThres)) |
if (((global <GlobalBrightThres) &&(global >GlobalDarkThres)) |
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|| (mid_range < MidRangeThres)) { |
|| (mid_range < MidRangeThres)) { |
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for (k = 0; k < mb_height; k++) { |
for (k = 0; k < mb_height; k++) { |
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for (l = 0; l < mb_width; l++) // do this for all macroblocks individually |
for (l = 0; l < mb_width; l++) /* do this for all macroblocks individually */ |
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{ |
{ |
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if (val[k * mb_width + l] < DarkThres) |
if (val[k * mb_width + l] < DarkThres) |
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quant[k * mb_width + l] += |
quant[k * mb_width + l] += |