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/***************************************************************************** |
/****************************************************************************** |
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* |
* * |
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* XVID MPEG-4 VIDEO CODEC |
* This file is part of XviD, a free MPEG-4 video encoder/decoder * |
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* - Prediction functions - |
* * |
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* |
* XviD is an implementation of a part of one or more MPEG-4 Video tools * |
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* Copyright(C) 2001-2002 - Michael Militzer <isibaar@xvid.org> |
* as specified in ISO/IEC 14496-2 standard. Those intending to use this * |
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* Copyright(C) 2001-2002 - Peter Ross <pross@xvid.org> |
* software module in hardware or software products are advised that its * |
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* |
* use may infringe existing patents or copyrights, and any such use * |
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* This file is part of XviD, a free MPEG-4 video encoder/decoder |
* would be at such party's own risk. The original developer of this * |
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* |
* software module and his/her company, and subsequent editors and their * |
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* XviD is free software; you can redistribute it and/or modify it |
* companies, will have no liability for use of this software or * |
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* under the terms of the GNU General Public License as published by |
* modifications or derivatives thereof. * |
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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. |
* 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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* This program is distributed in the hope that it will be useful, |
* the Free Software Foundation; either version 2 of the License, or * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* (at your option) any later version. * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
* * |
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* GNU General Public License for more details. |
* XviD is distributed in the hope that it will be useful, but * |
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* |
* WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* You should have received a copy of the GNU General Public License |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* along with this program; if not, write to the Free Software |
* GNU General Public License for more details. * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* * |
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* |
* You should have received a copy of the GNU General Public License * |
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* Under section 8 of the GNU General Public License, the copyright |
* along with this program; if not, write to the Free Software * |
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* holders of XVID explicitly forbid distribution in the following |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * |
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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 |
* mbprediction.c * |
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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. |
* Copyright (C) 2001 - Michael Militzer <isibaar@xvid.org> * |
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* |
* Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au> * |
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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 |
* For more information visit the XviD homepage: http://www.xvid.org * |
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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 |
* Revision history: * |
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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. |
* 29.06.2002 predict_acdc() bounding * |
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* |
* 12.12.2001 improved calc_acdc_prediction; removed need for memcpy * |
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* Note that people who make modified versions of XviD are not obligated |
* 15.12.2001 moved pmv displacement to motion estimation * |
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* to grant this special exception for their modified versions; it is |
* 30.11.2001 mmx cbp support * |
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* their choice whether to do so. The GNU General Public License gives |
* 17.11.2001 initial version * |
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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: mbprediction.c,v 1.12 2002-12-15 01:21:12 edgomez Exp $ |
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* |
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****************************************************************************/ |
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#include "../global.h" |
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#include "../encoder.h" |
#include "../encoder.h" |
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#include "mbprediction.h" |
#include "mbprediction.h" |
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#include "../utils/mbfunctions.h" |
#include "../utils/mbfunctions.h" |
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#include "../bitstream/cbp.h" |
#include "../bitstream/cbp.h" |
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#include "../bitstream/mbcoding.h" |
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#include "../bitstream/zigzag.h" |
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#define ABS(X) (((X)>0)?(X):-(X)) |
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#define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) |
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/***************************************************************************** |
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* Local inlined function |
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****************************************************************************/ |
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static int __inline |
static int __inline |
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rescale(int predict_quant, |
rescale(int predict_quant, |
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int current_quant, |
int current_quant, |
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} |
} |
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/***************************************************************************** |
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* Local data |
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****************************************************************************/ |
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static const int16_t default_acdc_values[15] = { |
static const int16_t default_acdc_values[15] = { |
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1024, |
1024, |
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0, 0, 0, 0, 0, 0, 0, |
0, 0, 0, 0, 0, 0, 0, |
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}; |
}; |
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/***************************************************************************** |
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* Functions |
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****************************************************************************/ |
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/* get dc/ac prediction direction for a single block and place |
/* get dc/ac prediction direction for a single block and place |
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predictor values into MB->pred_values[j][..] |
predictor values into MB->pred_values[j][..] |
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*/ |
*/ |
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const int16_t *pTop = default_acdc_values; |
const int16_t *pTop = default_acdc_values; |
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const int16_t *pDiag = default_acdc_values; |
const int16_t *pDiag = default_acdc_values; |
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uint32_t index = x + y * mb_width; /* current macroblock */ |
uint32_t index = x + y * mb_width; // current macroblock |
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int *acpred_direction = &pMBs[index].acpred_directions[block]; |
int *acpred_direction = &pMBs[index].acpred_directions[block]; |
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uint32_t i; |
uint32_t i; |
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left = top = diag = current = 0; |
left = top = diag = current = 0; |
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/* grab left,top and diag macroblocks */ |
// grab left,top and diag macroblocks |
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/* left macroblock */ |
// left macroblock |
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if (x && mbpos >= bound + 1 && |
if (x && mbpos >= bound + 1 && |
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(pMBs[index - 1].mode == MODE_INTRA || |
(pMBs[index - 1].mode == MODE_INTRA || |
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left = pMBs[index - 1].pred_values[0]; |
left = pMBs[index - 1].pred_values[0]; |
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left_quant = pMBs[index - 1].quant; |
left_quant = pMBs[index - 1].quant; |
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/*DEBUGI("LEFT", *(left+MBPRED_SIZE)); */ |
//DEBUGI("LEFT", *(left+MBPRED_SIZE)); |
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} |
} |
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/* top macroblock */ |
// top macroblock |
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if (mbpos >= bound + (int)mb_width && |
if (mbpos >= bound + (int)mb_width && |
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(pMBs[index - mb_width].mode == MODE_INTRA || |
(pMBs[index - mb_width].mode == MODE_INTRA || |
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top = pMBs[index - mb_width].pred_values[0]; |
top = pMBs[index - mb_width].pred_values[0]; |
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top_quant = pMBs[index - mb_width].quant; |
top_quant = pMBs[index - mb_width].quant; |
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} |
} |
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/* diag macroblock */ |
// diag macroblock |
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if (x && mbpos >= bound + (int)mb_width + 1 && |
if (x && mbpos >= bound + (int)mb_width + 1 && |
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(pMBs[index - 1 - mb_width].mode == MODE_INTRA || |
(pMBs[index - 1 - mb_width].mode == MODE_INTRA || |
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current = pMBs[index].pred_values[0]; |
current = pMBs[index].pred_values[0]; |
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/* now grab pLeft, pTop, pDiag _blocks_ */ |
// now grab pLeft, pTop, pDiag _blocks_ |
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switch (block) { |
switch (block) { |
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break; |
break; |
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} |
} |
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/* determine ac prediction direction & ac/dc predictor */ |
// determine ac prediction direction & ac/dc predictor |
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/* place rescaled ac/dc predictions into predictors[] for later use */ |
// place rescaled ac/dc predictions into predictors[] for later use |
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if (ABS(pLeft[0] - pDiag[0]) < ABS(pDiag[0] - pTop[0])) { |
if (ABS(pLeft[0] - pDiag[0]) < ABS(pDiag[0] - pTop[0])) { |
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*acpred_direction = 1; /* vertical */ |
*acpred_direction = 1; // vertical |
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predictors[0] = (int16_t)(DIV_DIV(pTop[0], iDcScaler)); |
predictors[0] = DIV_DIV(pTop[0], iDcScaler); |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
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predictors[i] = rescale(top_quant, current_quant, pTop[i]); |
predictors[i] = rescale(top_quant, current_quant, pTop[i]); |
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} |
} |
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} else { |
} else { |
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*acpred_direction = 2; /* horizontal */ |
*acpred_direction = 2; // horizontal |
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predictors[0] = (int16_t)(DIV_DIV(pLeft[0], iDcScaler)); |
predictors[0] = DIV_DIV(pLeft[0], iDcScaler); |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
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predictors[i] = rescale(left_quant, current_quant, pLeft[i + 7]); |
predictors[i] = rescale(left_quant, current_quant, pLeft[i + 7]); |
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} |
} |
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DPRINTF(DPRINTF_COEFF,"predictor[0] %i", predictors[0]); |
DPRINTF(DPRINTF_COEFF,"predictor[0] %i", predictors[0]); |
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dct_codes[0] += predictors[0]; /* dc prediction */ |
dct_codes[0] += predictors[0]; // dc prediction |
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pCurrent[0] = (int16_t)(dct_codes[0] * iDcScaler); |
pCurrent[0] = dct_codes[0] * iDcScaler; |
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if (acpred_direction == 1) { |
if (acpred_direction == 1) { |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
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/* ****************************************************************** */ |
// ****************************************************************** |
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/* ****************************************************************** */ |
// ****************************************************************** |
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/* encoder: subtract predictors from qcoeff[] and calculate S1/S2 |
/* encoder: subtract predictors from qcoeff[] and calculate S1/S2 |
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todo: perform [-127,127] clamping after prediction |
returns sum of coeefficients *saved* if prediction is enabled |
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clamping must adjust the coeffs, so dequant is done correctly |
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S1/S2 are used to determine if its worth predicting for AC |
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S1 = sum of all (qcoeff - prediction) |
S1 = sum of all (qcoeff - prediction) |
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S2 = sum of all qcoeff |
S2 = sum of all qcoeff |
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*/ |
*/ |
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uint32_t |
int |
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calc_acdc(MACROBLOCK * pMB, |
calc_acdc_coeff(MACROBLOCK * pMB, |
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uint32_t block, |
uint32_t block, |
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int16_t qcoeff[64], |
int16_t qcoeff[64], |
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uint32_t iDcScaler, |
uint32_t iDcScaler, |
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{ |
{ |
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int16_t *pCurrent = pMB->pred_values[block]; |
int16_t *pCurrent = pMB->pred_values[block]; |
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uint32_t i; |
uint32_t i; |
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uint32_t S1 = 0, S2 = 0; |
int S1 = 0, S2 = 0; |
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/* store current coeffs to pred_values[] for future prediction */ |
/* store current coeffs to pred_values[] for future prediction */ |
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pCurrent[0] = (int16_t)(qcoeff[0] * iDcScaler); |
pCurrent[0] = qcoeff[0] * iDcScaler; |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
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pCurrent[i] = qcoeff[i]; |
pCurrent[i] = qcoeff[i]; |
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pCurrent[i + 7] = qcoeff[i * 8]; |
pCurrent[i + 7] = qcoeff[i * 8]; |
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S1 += ABS(level); |
S1 += ABS(level); |
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predictors[i] = level; |
predictors[i] = level; |
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} |
} |
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} else /* acpred_direction == 2 */ |
} else // acpred_direction == 2 |
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{ |
{ |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) { |
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int16_t level; |
int16_t level; |
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} |
} |
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/* returns the bits *saved* if prediction is enabled */ |
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int |
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calc_acdc_bits(MACROBLOCK * pMB, |
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uint32_t block, |
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int16_t qcoeff[64], |
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uint32_t iDcScaler, |
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int16_t predictors[8]) |
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{ |
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const int direction = pMB->acpred_directions[block]; |
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int16_t *pCurrent = pMB->pred_values[block]; |
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int16_t tmp[8]; |
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unsigned int i; |
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int Z1, Z2; |
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/* store current coeffs to pred_values[] for future prediction */ |
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pCurrent[0] = qcoeff[0] * iDcScaler; |
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for (i = 1; i < 8; i++) { |
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pCurrent[i] = qcoeff[i]; |
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pCurrent[i + 7] = qcoeff[i * 8]; |
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} |
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/* dc prediction */ |
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qcoeff[0] = qcoeff[0] - predictors[0]; |
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/* calc cost before ac prediction */ |
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#ifdef BIGLUT |
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Z2 = CodeCoeff_CalcBits(qcoeff, intra_table, scan_tables[0], 1); |
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#else |
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Z2 = CodeCoeffIntra_CalcBits(qcoeff, scan_tables[0]); |
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#endif |
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/* apply ac prediction & calc cost*/ |
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if (direction == 1) { |
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for (i = 1; i < 8; i++) { |
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tmp[i] = qcoeff[i]; |
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qcoeff[i] -= predictors[i]; |
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predictors[i] = qcoeff[i]; |
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} |
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}else{ // acpred_direction == 2 |
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for (i = 1; i < 8; i++) { |
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tmp[i] = qcoeff[i*8]; |
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qcoeff[i*8] -= predictors[i]; |
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predictors[i] = qcoeff[i*8]; |
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} |
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} |
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#ifdef BIGLUT |
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Z1 = CodeCoeff_CalcBits(qcoeff, intra_table, scan_tables[direction], 1); |
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#else |
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Z1 = CodeCoeffIntra_CalcBits(qcoeff, scan_tables[direction]); |
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#endif |
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/* undo prediction */ |
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if (direction == 1) { |
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for (i = 1; i < 8; i++) |
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qcoeff[i] = tmp[i]; |
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}else{ // acpred_direction == 2 |
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for (i = 1; i < 8; i++) |
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qcoeff[i*8] = tmp[i]; |
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} |
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return Z2-Z1; |
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} |
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/* apply predictors[] to qcoeff */ |
/* apply predictors[] to qcoeff */ |
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void |
void |
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int16_t qcoeff[64], |
int16_t qcoeff[64], |
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int16_t predictors[8]) |
int16_t predictors[8]) |
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{ |
{ |
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uint32_t i; |
unsigned int i; |
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if (pMB->acpred_directions[block] == 1) { |
if (pMB->acpred_directions[block] == 1) { |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) |
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qcoeff[i] = predictors[i]; |
qcoeff[i] = predictors[i]; |
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} |
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} else { |
} else { |
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for (i = 1; i < 8; i++) { |
for (i = 1; i < 8; i++) |
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qcoeff[i * 8] = predictors[i]; |
qcoeff[i * 8] = predictors[i]; |
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} |
} |
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} |
} |
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} |
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void |
void |
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int32_t j; |
int32_t j; |
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int32_t iDcScaler, iQuant = frame->quant; |
int32_t iDcScaler, iQuant = frame->quant; |
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int32_t S = 0; |
int S = 0; |
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int16_t predictors[6][8]; |
int16_t predictors[6][8]; |
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MACROBLOCK *pMB = &frame->mbs[x + y * mb_width]; |
MACROBLOCK *pMB = &frame->mbs[x + y * mb_width]; |
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if ((pMB->mode == MODE_INTRA) || (pMB->mode == MODE_INTRA_Q)) { |
if ((pMB->mode == MODE_INTRA) || (pMB->mode == MODE_INTRA_Q)) { |
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for (j = 0; j < 6; j++) { |
for (j = 0; j < 6; j++) { |
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iDcScaler = get_dc_scaler(iQuant, (j < 4) ? 1 : 0); |
iDcScaler = get_dc_scaler(iQuant, j<4); |
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predict_acdc(frame->mbs, x, y, mb_width, j, &qcoeff[j * 64], |
predict_acdc(frame->mbs, x, y, mb_width, j, &qcoeff[j * 64], |
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iQuant, iDcScaler, predictors[j], 0); |
iQuant, iDcScaler, predictors[j], 0); |
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S += calc_acdc(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |
if ((frame->global_flags & XVID_HQACPRED)) |
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S += calc_acdc_bits(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |
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else |
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S += calc_acdc_coeff(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |
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} |
} |
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if (S < 0) /* dont predict */ |
if (S<=0) { // dont predict |
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{ |
for (j = 0; j < 6; j++) |
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for (j = 0; j < 6; j++) { |
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pMB->acpred_directions[j] = 0; |
pMB->acpred_directions[j] = 0; |
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} |
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} else { |
} else { |
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for (j = 0; j < 6; j++) { |
for (j = 0; j < 6; j++) |
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apply_acdc(pMB, j, &qcoeff[j * 64], predictors[j]); |
apply_acdc(pMB, j, &qcoeff[j * 64], predictors[j]); |
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} |
} |
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} |
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pMB->cbp = calc_cbp(qcoeff); |
pMB->cbp = calc_cbp(qcoeff); |
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} |
} |
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