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/***************************************************************************** |
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* |
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* XVID MPEG-4 VIDEO CODEC |
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* - cbp function (zero block flags) - |
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* |
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* Copyright (C) 2001-2002 - Edouard Gomez <ed.gomez@free.fr> |
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* |
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* This file is part of XviD, a free MPEG-4 video encoder/decoder |
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* |
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* XviD is free software; you can redistribute it and/or modify it |
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* 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 |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* 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 |
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* |
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* 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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* $Id$ |
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* |
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****************************************************************************/ |
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#include "../portab.h" |
#include "../portab.h" |
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#include "cbp.h" |
#include "cbp.h" |
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/***************************************************************************** |
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* Global function pointer |
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****************************************************************************/ |
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cbpFuncPtr calc_cbp; |
cbpFuncPtr calc_cbp; |
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/***************************************************************************** |
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* Functions |
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****************************************************************************/ |
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/* |
/* |
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* Returns a field of bits that indicates non zero ac blocks |
* Returns a field of bits that indicates non zero ac blocks |
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* for this macro block |
* for this macro block |
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*/ |
*/ |
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/* naive C */ |
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uint32_t |
uint32_t |
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calc_cbp_c(const int16_t codes[6 * 64]) |
calc_cbp_plain(const int16_t codes[6 * 64]) |
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{ |
{ |
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uint32_t i, j; |
int i, j; |
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uint32_t cbp = 0; |
uint32_t cbp = 0; |
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for (i = 0; i < 6; i++) { |
for (i = 0; i < 6; i++) { |
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for (j = 1; j < 61; j += 4) { |
for (j=1; j<64;j++) { |
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if (codes[i * 64 + j] | codes[i * 64 + j + 1] | |
if (codes[64*i+j]) { |
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codes[i * 64 + j + 2] | codes[i * 64 + j + 3]) { |
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cbp |= 1 << (5 - i); |
cbp |= 1 << (5 - i); |
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break; |
break; |
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} |
} |
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} |
} |
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} |
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return cbp; |
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} |
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if (codes[i * 64 + j] | codes[i * 64 + j + 1] | codes[i * 64 + j + 2]) |
/* optimized C */ |
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cbp |= 1 << (5 - i); |
uint32_t |
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calc_cbp_c(const int16_t codes[6 * 64]) |
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{ |
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unsigned int i=6; |
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uint32_t cbp = 0; |
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/* uses fixed relation: 4*codes = 1*codes64 */ |
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/* if prototype is changed (e.g. from int16_t to something like int32) this routine |
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has to be changed! */ |
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do { |
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uint64_t *codes64 = (uint64_t*)codes; /* the compiler doesn't really make this */ |
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uint32_t *codes32 = (uint32_t*)codes; /* variables, just "addressing modes" */ |
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cbp += cbp; |
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if (codes[1] || codes32[1]) { |
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cbp++; |
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} |
} |
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else if (codes64[1] | codes64[2] | codes64[3]) { |
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cbp++; |
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} |
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else if (codes64[4] | codes64[5] | codes64[6] | codes64[7]) { |
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cbp++; |
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} |
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else if (codes64[8] | codes64[9] | codes64[10] | codes64[11]) { |
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cbp++; |
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} |
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else if (codes64[12] | codes64[13] | codes64[14] | codes64[15]) { |
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cbp++; |
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} |
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codes += 64; |
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i--; |
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} while (i != 0); |
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return cbp; |
return cbp; |
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} |
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/* older code maybe better on some plattforms? */ |
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#if (0==1) |
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for (i = 5; i >= 0; i--) { |
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if (codes[1] | codes[2] | codes[3]) |
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cbp |= 1 << i; |
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else { |
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for (j = 4; j <= 56; j+=4) /* [60],[61],[62],[63] are last */ |
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if (codes[j] | codes[j+1] | codes[j+2] | codes[j+3]) { |
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cbp |= 1 << i; |
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break; |
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} |
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} |
} |
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codes += 64; |
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} |
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return cbp; |
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#endif |