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      1 /**
      2  *
      3  * File Name:  armVCM4P2_SetPredDir.c
      4  * OpenMAX DL: v1.0.2
      5  * Revision:   9641
      6  * Date:       Thursday, February 7, 2008
      7  *
      8  * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
      9  *
     10  *
     11  *
     12  * Description:
     13  * Contains module for detecting the prediction direction
     14  *
     15  */
     16 
     17 #include "omxtypes.h"
     18 #include "armOMX.h"
     19 
     20 #include "armVC.h"
     21 #include "armCOMM.h"
     22 
     23 /**
     24  * Function: armVCM4P2_SetPredDir
     25  *
     26  * Description:
     27  * Performs detecting the prediction direction
     28  *
     29  * Remarks:
     30  *
     31  * Parameters:
     32  * [in] blockIndex  block index indicating the component type and
     33  *                          position as defined in subclause 6.1.3.8, of ISO/IEC
     34  *                          14496-2. Furthermore, indexes 6 to 9 indicate the
     35  *                          alpha blocks spatially corresponding to luminance
     36  *                          blocks 0 to 3 in the same macroblock.
     37  * [in] pCoefBufRow pointer to the coefficient row buffer
     38  * [in] pQpBuf      pointer to the quantization parameter buffer
     39  * [out]    predQP      quantization parameter of the predictor block
     40  * [out]    predDir     indicates the prediction direction which takes one
     41  *                          of the following values:
     42  *                          OMX_VC_HORIZONTAL    predict horizontally
     43  *                          OMX_VC_VERTICAL      predict vertically
     44  *
     45  * Return Value:
     46  * Standard OMXResult result. See enumeration for possible result codes.
     47  *
     48  */
     49 
     50 OMXResult armVCM4P2_SetPredDir(
     51      OMX_INT blockIndex,
     52      OMX_S16 *pCoefBufRow,
     53      OMX_S16 *pCoefBufCol,
     54      OMX_INT *predDir,
     55      OMX_INT *predQP,
     56      const OMX_U8 *pQpBuf
     57 )
     58 {
     59     OMX_U8  blockDCLeft;
     60     OMX_U8  blockDCTop;
     61     OMX_U8  blockDCTopLeft;
     62 
     63     if (blockIndex == 3)
     64     {
     65         blockDCTop = *(pCoefBufCol - 8);
     66     }
     67     else
     68     {
     69         blockDCTop = *pCoefBufRow;
     70     }
     71     blockDCLeft = *pCoefBufCol;
     72     blockDCTopLeft = *(pCoefBufRow - 8);
     73 
     74     if (armAbs(blockDCLeft - blockDCTopLeft) < armAbs(blockDCTopLeft \
     75                                                         - blockDCTop))
     76     {
     77         *predDir = OMX_VC_VERTICAL;
     78         *predQP = pQpBuf[1];
     79     }
     80     else
     81     {
     82         *predDir = OMX_VC_HORIZONTAL;
     83         *predQP = pQpBuf[0];
     84     }
     85     return OMX_Sts_NoErr;
     86 }
     87 
     88 
     89 /*End of File*/
     90