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/****************************************************************************** |
/***************************************************************************** |
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* * |
* |
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* This file is part of XviD, a free MPEG-4 video encoder/decoder * |
* XVID MPEG-4 VIDEO CODEC |
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* * |
* - Prediction module - |
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* XviD is an implementation of a part of one or more MPEG-4 Video tools * |
* |
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* as specified in ISO/IEC 14496-2 standard. Those intending to use this * |
* Copyright (C) 2001-2003 Michael Militzer <isibaar@xvid.org> |
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* software module in hardware or software products are advised that its * |
* 2001-2003 Peter Ross <pross@xvid.org> |
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* use may infringe existing patents or copyrights, and any such use * |
* |
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* would be at such party's own risk. The original developer of this * |
* This program is free software ; you can redistribute it and/or modify |
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* software module and his/her company, and subsequent editors and their * |
* it under the terms of the GNU General Public License as published by |
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* companies, will have no liability for use of this software or * |
* the Free Software Foundation ; either version 2 of the License, or |
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* modifications or derivatives thereof. * |
* (at your option) any later version. |
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* * |
* |
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* XviD is free software; you can redistribute it and/or modify it * |
* This program is distributed in the hope that it will be useful, |
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* under the terms of the GNU General Public License as published by * |
* but WITHOUT ANY WARRANTY ; without even the implied warranty of |
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* the Free Software Foundation; either version 2 of the License, or * |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* (at your option) any later version. * |
* GNU General Public License for more details. |
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* * |
* |
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* XviD is distributed in the hope that it will be useful, but * |
* You should have received a copy of the GNU General Public License |
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* WITHOUT ANY WARRANTY; without even the implied warranty of * |
* along with this program ; if not, write to the Free Software |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* GNU General Public License for more details. * |
* |
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* * |
* $Id$ |
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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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******************************************************************************/ |
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/****************************************************************************** |
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* * |
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* mbprediction.c * |
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* * |
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* 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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* * |
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* For more information visit the XviD homepage: http://www.xvid.org * |
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* * |
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******************************************************************************/ |
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/****************************************************************************** |
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* * |
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* Revision history: * |
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* * |
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* 12.12.2001 improved calc_acdc_prediction; removed need for memcpy * |
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* 15.12.2001 moved pmv displacement to motion estimation * |
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* 30.11.2001 mmx cbp support * |
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* 17.11.2001 initial version * |
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* * |
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******************************************************************************/ |
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#include <stdlib.h> |
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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)) |
static int __inline |
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#define DIV_DIV(A,B) ( (A) > 0 ? ((A)+((B)>>1))/(B) : ((A)-((B)>>1))/(B) ) |
rescale(int predict_quant, |
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int current_quant, |
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int coeff) |
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static int __inline rescale(int predict_quant, int current_quant, int coeff) |
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{ |
{ |
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return (coeff != 0) ? DIV_DIV((coeff) * (predict_quant), (current_quant)) : 0; |
return (coeff != 0) ? DIV_DIV((coeff) * (predict_quant), |
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(current_quant)) : 0; |
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} |
} |
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*/ |
*/ |
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void predict_acdc(MACROBLOCK *pMBs, |
void |
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uint32_t x, uint32_t y, uint32_t mb_width, |
predict_acdc(MACROBLOCK * pMBs, |
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uint32_t x, |
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uint32_t y, |
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uint32_t mb_width, |
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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 current_quant, |
uint32_t current_quant, |
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int32_t iDcScaler, |
int32_t iDcScaler, |
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int16_t predictors[8]) |
int16_t predictors[8], |
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const int bound) |
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{ |
{ |
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const int mbpos = (y * mb_width) + x; |
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int16_t *left, *top, *diag, *current; |
int16_t *left, *top, *diag, *current; |
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int32_t left_quant = current_quant; |
int32_t left_quant = current_quant; |
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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 && (pMBs[index - 1].mode == MODE_INTRA |
if (x && mbpos >= bound + 1 && |
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|| pMBs[index - 1].mode == MODE_INTRA_Q)) { |
(pMBs[index - 1].mode == MODE_INTRA || |
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pMBs[index - 1].mode == MODE_INTRA_Q)) { |
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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)); |
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} |
} |
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/* top macroblock */ |
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// top macroblock |
if (mbpos >= bound + (int)mb_width && |
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(pMBs[index - mb_width].mode == MODE_INTRA || |
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if(y && (pMBs[index - mb_width].mode == MODE_INTRA |
pMBs[index - mb_width].mode == MODE_INTRA_Q)) { |
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|| pMBs[index - mb_width].mode == MODE_INTRA_Q)) { |
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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 */ |
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// diag macroblock |
if (x && mbpos >= bound + (int)mb_width + 1 && |
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(pMBs[index - 1 - mb_width].mode == MODE_INTRA || |
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if(x && y && (pMBs[index - 1 - mb_width].mode == MODE_INTRA |
pMBs[index - 1 - mb_width].mode == MODE_INTRA_Q)) { |
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|| pMBs[index - 1 - mb_width].mode == MODE_INTRA_Q)) { |
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diag = pMBs[index - 1 - mb_width].pred_values[0]; |
diag = pMBs[index - 1 - mb_width].pred_values[0]; |
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} |
} |
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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 |
/* |
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// place rescaled ac/dc predictions into predictors[] for later use |
* determine ac prediction direction & ac/dc predictor place rescaled ac/dc |
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* predictions into predictors[] for later use |
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*/ |
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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] = 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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{ |
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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 { |
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else |
*acpred_direction = 2; /* horizontal */ |
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{ |
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*acpred_direction = 2; // horizontal |
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predictors[0] = 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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{ |
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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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} |
} |
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*/ |
*/ |
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void add_acdc(MACROBLOCK *pMB, |
void |
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add_acdc(MACROBLOCK * pMB, |
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uint32_t block, |
uint32_t block, |
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int16_t dct_codes[64], |
int16_t dct_codes[64], |
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uint32_t iDcScaler, |
uint32_t iDcScaler, |
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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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dct_codes[0] += predictors[0]; // dc prediction |
DPRINTF(XVID_DEBUG_COEFF,"predictor[0] %i\n", predictors[0]); |
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dct_codes[0] += predictors[0]; /* dc prediction */ |
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pCurrent[0] = 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++) { |
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for (i = 1; i < 8; i++) |
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{ |
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int level = dct_codes[i] + predictors[i]; |
int level = dct_codes[i] + predictors[i]; |
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DPRINTF(XVID_DEBUG_COEFF,"predictor[%i] %i\n",i, predictors[i]); |
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dct_codes[i] = level; |
dct_codes[i] = level; |
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pCurrent[i] = level; |
pCurrent[i] = level; |
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pCurrent[i+7] = dct_codes[i*8]; |
pCurrent[i+7] = dct_codes[i*8]; |
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} |
} |
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} |
} else if (acpred_direction == 2) { |
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else if (acpred_direction == 2) |
for (i = 1; i < 8; i++) { |
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{ |
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for (i = 1; i < 8; i++) |
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{ |
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int level = dct_codes[i*8] + predictors[i]; |
int level = dct_codes[i*8] + predictors[i]; |
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DPRINTF(XVID_DEBUG_COEFF,"predictor[%i] %i\n",i*8, predictors[i]); |
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dct_codes[i*8] = level; |
dct_codes[i*8] = level; |
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pCurrent[i+7] = level; |
pCurrent[i+7] = level; |
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pCurrent[i] = dct_codes[i]; |
pCurrent[i] = dct_codes[i]; |
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} |
} |
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} |
} else { |
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else |
for (i = 1; i < 8; i++) { |
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{ |
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for (i = 1; i < 8; i++) |
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{ |
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pCurrent[i] = dct_codes[i]; |
pCurrent[i] = dct_codes[i]; |
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pCurrent[i+7] = dct_codes[i*8]; |
pCurrent[i+7] = dct_codes[i*8]; |
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} |
} |
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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 calc_acdc(MACROBLOCK *pMB, |
int |
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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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qcoeff[0] = qcoeff[0] - predictors[0]; |
qcoeff[0] = qcoeff[0] - predictors[0]; |
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if (pMB->acpred_directions[block] == 1) |
if (pMB->acpred_directions[block] == 1) { |
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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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level = qcoeff[i]; |
level = qcoeff[i]; |
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S2 += ABS(level); |
S2 += abs(level); |
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level -= predictors[i]; |
level -= predictors[i]; |
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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 */ |
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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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level = qcoeff[i*8]; |
level = qcoeff[i*8]; |
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S2 += ABS(level); |
S2 += abs(level); |
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level -= predictors[i]; |
level -= predictors[i]; |
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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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} |
} |
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/* apply predictors[] to qcoeff */ |
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void apply_acdc(MACROBLOCK *pMB, |
/* 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, |
uint32_t block, |
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int16_t qcoeff[64], |
int16_t qcoeff[64], |
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uint32_t iDcScaler, |
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int16_t predictors[8]) |
int16_t predictors[8]) |
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{ |
{ |
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uint32_t i; |
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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if (pMB->acpred_directions[block] == 1) |
/* 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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Z2 = CodeCoeffIntra_CalcBits(qcoeff, scan_tables[0]); |
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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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Z1 = CodeCoeffIntra_CalcBits(qcoeff, scan_tables[direction]); |
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/* undo prediction */ |
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if (direction == 1) { |
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for(i = 1; i < 8; i++) |
for(i = 1; i < 8; i++) |
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{ |
qcoeff[i] = tmp[i]; |
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qcoeff[i] = predictors[i]; |
}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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else |
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/* apply predictors[] to qcoeff */ |
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void |
384 |
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apply_acdc(MACROBLOCK * pMB, |
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uint32_t block, |
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int16_t qcoeff[64], |
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int16_t predictors[8]) |
388 |
{ |
{ |
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unsigned int i; |
390 |
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391 |
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if (pMB->acpred_directions[block] == 1) { |
392 |
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for (i = 1; i < 8; i++) |
393 |
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qcoeff[i] = predictors[i]; |
394 |
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} else { |
395 |
for(i = 1; i < 8; i++) |
for(i = 1; i < 8; i++) |
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{ |
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396 |
qcoeff[i*8] = predictors[i]; |
qcoeff[i*8] = predictors[i]; |
397 |
} |
} |
398 |
} |
} |
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} |
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400 |
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401 |
void MBPrediction(FRAMEINFO *frame, |
void |
402 |
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MBPrediction(FRAMEINFO * frame, |
403 |
uint32_t x, |
uint32_t x, |
404 |
uint32_t y, |
uint32_t y, |
405 |
uint32_t mb_width, |
uint32_t mb_width, |
407 |
{ |
{ |
408 |
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409 |
int32_t j; |
int32_t j; |
410 |
int32_t iDcScaler, iQuant = frame->quant; |
int32_t iDcScaler, iQuant; |
411 |
int32_t S = 0; |
int S = 0; |
412 |
int16_t predictors[6][8]; |
int16_t predictors[6][8]; |
413 |
|
|
414 |
MACROBLOCK *pMB = &frame->mbs[x + y * mb_width]; |
MACROBLOCK *pMB = &frame->mbs[x + y * mb_width]; |
415 |
|
iQuant = pMB->quant; |
416 |
|
|
417 |
if ((pMB->mode == MODE_INTRA) || (pMB->mode == MODE_INTRA_Q)) { |
if ((pMB->mode == MODE_INTRA) || (pMB->mode == MODE_INTRA_Q)) { |
418 |
|
|
419 |
for(j = 0; j < 6; j++) |
for (j = 0; j < 6; j++) { |
420 |
{ |
iDcScaler = get_dc_scaler(iQuant, j<4); |
|
iDcScaler = get_dc_scaler(iQuant, (j < 4) ? 1 : 0); |
|
421 |
|
|
422 |
predict_acdc(frame->mbs, |
predict_acdc(frame->mbs, x, y, mb_width, j, &qcoeff[j * 64], |
423 |
x, |
iQuant, iDcScaler, predictors[j], 0); |
424 |
y, |
|
425 |
mb_width, |
if ((frame->vop_flags & XVID_VOP_HQACPRED)) |
426 |
j, |
S += calc_acdc_bits(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |
427 |
&qcoeff[j*64], |
else |
428 |
iQuant, |
S += calc_acdc_coeff(pMB, j, &qcoeff[j * 64], iDcScaler, predictors[j]); |
|
iDcScaler, |
|
|
predictors[j]); |
|
|
|
|
|
S += calc_acdc(pMB, |
|
|
j, |
|
|
&qcoeff[j*64], |
|
|
iDcScaler, |
|
|
predictors[j]); |
|
429 |
|
|
430 |
} |
} |
431 |
|
|
432 |
if (S < 0) // dont predict |
if (S<=0) { /* dont predict */ |
|
{ |
|
433 |
for(j = 0; j < 6; j++) |
for(j = 0; j < 6; j++) |
|
{ |
|
434 |
pMB->acpred_directions[j] = 0; |
pMB->acpred_directions[j] = 0; |
435 |
} |
}else{ |
|
} |
|
|
else |
|
|
{ |
|
436 |
for(j = 0; j < 6; j++) |
for(j = 0; j < 6; j++) |
|
{ |
|
437 |
apply_acdc(pMB, j, &qcoeff[j*64], predictors[j]); |
apply_acdc(pMB, j, &qcoeff[j*64], predictors[j]); |
438 |
} |
} |
439 |
} |
|
440 |
pMB->cbp = calc_cbp(qcoeff); |
pMB->cbp = calc_cbp(qcoeff); |
441 |
} |
} |
442 |
|
} |
443 |
|
|
444 |
|
static const VECTOR zeroMV = { 0, 0 }; |
445 |
|
|
446 |
|
VECTOR |
447 |
|
get_pmv2(const MACROBLOCK * const mbs, |
448 |
|
const int mb_width, |
449 |
|
const int bound, |
450 |
|
const int x, |
451 |
|
const int y, |
452 |
|
const int block) |
453 |
|
{ |
454 |
|
int lx, ly, lz; /* left */ |
455 |
|
int tx, ty, tz; /* top */ |
456 |
|
int rx, ry, rz; /* top-right */ |
457 |
|
int lpos, tpos, rpos; |
458 |
|
int num_cand = 0, last_cand = 1; |
459 |
|
|
460 |
|
VECTOR pmv[4]; /* left neighbour, top neighbour, top-right neighbour */ |
461 |
|
|
462 |
|
switch (block) { |
463 |
|
case 0: |
464 |
|
lx = x - 1; ly = y; lz = 1; |
465 |
|
tx = x; ty = y - 1; tz = 2; |
466 |
|
rx = x + 1; ry = y - 1; rz = 2; |
467 |
|
break; |
468 |
|
case 1: |
469 |
|
lx = x; ly = y; lz = 0; |
470 |
|
tx = x; ty = y - 1; tz = 3; |
471 |
|
rx = x + 1; ry = y - 1; rz = 2; |
472 |
|
break; |
473 |
|
case 2: |
474 |
|
lx = x - 1; ly = y; lz = 3; |
475 |
|
tx = x; ty = y; tz = 0; |
476 |
|
rx = x; ry = y; rz = 1; |
477 |
|
break; |
478 |
|
default: |
479 |
|
lx = x; ly = y; lz = 2; |
480 |
|
tx = x; ty = y; tz = 0; |
481 |
|
rx = x; ry = y; rz = 1; |
482 |
|
} |
483 |
|
|
484 |
|
lpos = lx + ly * mb_width; |
485 |
|
rpos = rx + ry * mb_width; |
486 |
|
tpos = tx + ty * mb_width; |
487 |
|
|
488 |
|
if (lpos >= bound && lx >= 0) { |
489 |
|
num_cand++; |
490 |
|
pmv[1] = mbs[lpos].mvs[lz]; |
491 |
|
} else pmv[1] = zeroMV; |
492 |
|
|
493 |
|
if (tpos >= bound) { |
494 |
|
num_cand++; |
495 |
|
last_cand = 2; |
496 |
|
pmv[2] = mbs[tpos].mvs[tz]; |
497 |
|
} else pmv[2] = zeroMV; |
498 |
|
|
499 |
|
if (rpos >= bound && rx < mb_width) { |
500 |
|
num_cand++; |
501 |
|
last_cand = 3; |
502 |
|
pmv[3] = mbs[rpos].mvs[rz]; |
503 |
|
} else pmv[3] = zeroMV; |
504 |
|
|
505 |
|
/* If there're more than one candidate, we return the median vector */ |
506 |
|
|
507 |
|
if (num_cand > 1) { |
508 |
|
/* set median */ |
509 |
|
pmv[0].x = |
510 |
|
MIN(MAX(pmv[1].x, pmv[2].x), |
511 |
|
MIN(MAX(pmv[2].x, pmv[3].x), MAX(pmv[1].x, pmv[3].x))); |
512 |
|
pmv[0].y = |
513 |
|
MIN(MAX(pmv[1].y, pmv[2].y), |
514 |
|
MIN(MAX(pmv[2].y, pmv[3].y), MAX(pmv[1].y, pmv[3].y))); |
515 |
|
return pmv[0]; |
516 |
|
} |
517 |
|
|
518 |
|
return pmv[last_cand]; /* no point calculating median mv */ |
519 |
|
} |
520 |
|
|
521 |
|
VECTOR |
522 |
|
get_qpmv2(const MACROBLOCK * const mbs, |
523 |
|
const int mb_width, |
524 |
|
const int bound, |
525 |
|
const int x, |
526 |
|
const int y, |
527 |
|
const int block) |
528 |
|
{ |
529 |
|
int lx, ly, lz; /* left */ |
530 |
|
int tx, ty, tz; /* top */ |
531 |
|
int rx, ry, rz; /* top-right */ |
532 |
|
int lpos, tpos, rpos; |
533 |
|
int num_cand = 0, last_cand = 1; |
534 |
|
|
535 |
|
VECTOR pmv[4]; /* left neighbour, top neighbour, top-right neighbour */ |
536 |
|
|
537 |
|
switch (block) { |
538 |
|
case 0: |
539 |
|
lx = x - 1; ly = y; lz = 1; |
540 |
|
tx = x; ty = y - 1; tz = 2; |
541 |
|
rx = x + 1; ry = y - 1; rz = 2; |
542 |
|
break; |
543 |
|
case 1: |
544 |
|
lx = x; ly = y; lz = 0; |
545 |
|
tx = x; ty = y - 1; tz = 3; |
546 |
|
rx = x + 1; ry = y - 1; rz = 2; |
547 |
|
break; |
548 |
|
case 2: |
549 |
|
lx = x - 1; ly = y; lz = 3; |
550 |
|
tx = x; ty = y; tz = 0; |
551 |
|
rx = x; ry = y; rz = 1; |
552 |
|
break; |
553 |
|
default: |
554 |
|
lx = x; ly = y; lz = 2; |
555 |
|
tx = x; ty = y; tz = 0; |
556 |
|
rx = x; ry = y; rz = 1; |
557 |
|
} |
558 |
|
|
559 |
|
lpos = lx + ly * mb_width; |
560 |
|
rpos = rx + ry * mb_width; |
561 |
|
tpos = tx + ty * mb_width; |
562 |
|
|
563 |
|
if (lpos >= bound && lx >= 0) { |
564 |
|
num_cand++; |
565 |
|
pmv[1] = mbs[lpos].qmvs[lz]; |
566 |
|
} else pmv[1] = zeroMV; |
567 |
|
|
568 |
|
if (tpos >= bound) { |
569 |
|
num_cand++; |
570 |
|
last_cand = 2; |
571 |
|
pmv[2] = mbs[tpos].qmvs[tz]; |
572 |
|
} else pmv[2] = zeroMV; |
573 |
|
|
574 |
|
if (rpos >= bound && rx < mb_width) { |
575 |
|
num_cand++; |
576 |
|
last_cand = 3; |
577 |
|
pmv[3] = mbs[rpos].qmvs[rz]; |
578 |
|
} else pmv[3] = zeroMV; |
579 |
|
|
580 |
|
/* If there're more than one candidate, we return the median vector */ |
581 |
|
|
582 |
|
if (num_cand > 1) { |
583 |
|
/* set median */ |
584 |
|
pmv[0].x = |
585 |
|
MIN(MAX(pmv[1].x, pmv[2].x), |
586 |
|
MIN(MAX(pmv[2].x, pmv[3].x), MAX(pmv[1].x, pmv[3].x))); |
587 |
|
pmv[0].y = |
588 |
|
MIN(MAX(pmv[1].y, pmv[2].y), |
589 |
|
MIN(MAX(pmv[2].y, pmv[3].y), MAX(pmv[1].y, pmv[3].y))); |
590 |
|
return pmv[0]; |
591 |
|
} |
592 |
|
|
593 |
|
return pmv[last_cand]; /* no point calculating median mv */ |
594 |
} |
} |