1 /** 2 * 3 * File Name: omxVCCOMM_LimitMVToRect.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 limiting the MV 14 * 15 */ 16 17 #include "omxtypes.h" 18 #include "armOMX.h" 19 #include "omxVC.h" 20 21 #include "armCOMM.h" 22 23 /** 24 * Function: omxVCCOMM_LimitMVToRect (6.1.4.1.3) 25 * 26 * Description: 27 * Limits the motion vector associated with the current block/macroblock to 28 * prevent the motion compensated block/macroblock from moving outside a 29 * bounding rectangle as shown in Figure 6-1. 30 * 31 * Input Arguments: 32 * 33 * pSrcMV - pointer to the motion vector associated with the current block 34 * or macroblock 35 * pRectVOPRef - pointer to the bounding rectangle 36 * Xcoord, Ycoord - coordinates of the current block or macroblock 37 * size - size of the current block or macroblock; must be equal to 8 or 38 * 16. 39 * 40 * Output Arguments: 41 * 42 * pDstMV - pointer to the limited motion vector 43 * 44 * Return Value: 45 * 46 * OMX_Sts_NoErr - no error 47 * OMX_Sts_BadArgErr - bad arguments. Returned if one or more of the 48 * following conditions is true: 49 * - at least one of the following pointers is NULL: 50 * pSrcMV, pDstMV, or pRectVOPRef. 51 * - size is not equal to either 8 or 16. 52 * - the width or height of the bounding rectangle is less than 53 * twice the block size. 54 */ 55 OMXResult omxVCCOMM_LimitMVToRect( 56 const OMXVCMotionVector * pSrcMV, 57 OMXVCMotionVector *pDstMV, 58 const OMXRect * pRectVOPRef, 59 OMX_INT Xcoord, 60 OMX_INT Ycoord, 61 OMX_INT size 62 ) 63 { 64 /* Argument error checks */ 65 armRetArgErrIf(pSrcMV == NULL, OMX_Sts_BadArgErr); 66 armRetArgErrIf(pDstMV == NULL, OMX_Sts_BadArgErr); 67 armRetArgErrIf(pRectVOPRef == NULL, OMX_Sts_BadArgErr); 68 armRetArgErrIf((size != 8) && (size != 16), OMX_Sts_BadArgErr); 69 armRetArgErrIf((pRectVOPRef->width < (2* size)), OMX_Sts_BadArgErr); 70 armRetArgErrIf((pRectVOPRef->height < (2* size)), OMX_Sts_BadArgErr); 71 72 pDstMV->dx = armMin (armMax (pSrcMV->dx, 2*pRectVOPRef->x - Xcoord), 73 (2*pRectVOPRef->x + pRectVOPRef->width - Xcoord - size)); 74 pDstMV->dy = armMin (armMax (pSrcMV->dy, 2*pRectVOPRef->y - Ycoord), 75 (2*pRectVOPRef->y + pRectVOPRef->height - Ycoord - size)); 76 77 78 return OMX_Sts_NoErr; 79 } 80 81 /* End of file */ 82
