1 /** 2 * 3 * File Name: omxVCM4P10_SATD_4x4.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 * Description: 12 * This function will calculate SAD for 4x4 blocks 13 * 14 */ 15 #include "omxtypes.h" 16 #include "armOMX.h" 17 #include "omxVC.h" 18 19 #include "armCOMM.h" 20 21 /** 22 * Function: omxVCM4P10_SATD_4x4 (6.3.5.4.5) 23 * 24 * Description: 25 * This function calculates the sum of absolute transform differences (SATD) 26 * for a 4x4 block by applying a Hadamard transform to the difference block 27 * and then calculating the sum of absolute coefficient values. 28 * 29 * Input Arguments: 30 * 31 * pSrcOrg - Pointer to the original block; must be aligned on a 4-byte 32 * boundary 33 * iStepOrg - Step of the original block buffer; must be a multiple of 4 34 * pSrcRef - Pointer to the reference block; must be aligned on a 4-byte 35 * boundary 36 * iStepRef - Step of the reference block buffer; must be a multiple of 4 37 * 38 * Output Arguments: 39 * 40 * pDstSAD - pointer to the resulting SAD 41 * 42 * Return Value: 43 * 44 * OMX_Sts_NoErr - no error 45 * OMX_Sts_BadArgErr - bad arguments; returned if any of the following 46 * conditions are true: 47 * - at least one of the following pointers is NULL: 48 * pSrcOrg, pSrcRef, or pDstSAD either pSrcOrg 49 * - pSrcRef is not aligned on a 4-byte boundary 50 * - iStepOrg <= 0 or iStepOrg is not a multiple of 4 51 * - iStepRef <= 0 or iStepRef is not a multiple of 4 52 * 53 */ 54 OMXResult omxVCM4P10_SATD_4x4( 55 const OMX_U8* pSrcOrg, 56 OMX_U32 iStepOrg, 57 const OMX_U8* pSrcRef, 58 OMX_U32 iStepRef, 59 OMX_U32* pDstSAD 60 ) 61 { 62 OMX_INT i, j; 63 OMX_S32 SATD = 0; 64 OMX_S32 d [4][4], m1[4][4], m2[4][4]; 65 66 /* check for argument error */ 67 armRetArgErrIf(pSrcOrg == NULL, OMX_Sts_BadArgErr) 68 armRetArgErrIf(pSrcRef == NULL, OMX_Sts_BadArgErr) 69 armRetArgErrIf(pDstSAD == NULL, OMX_Sts_BadArgErr) 70 armRetArgErrIf((iStepOrg == 0) || (iStepOrg & 3), OMX_Sts_BadArgErr) 71 armRetArgErrIf((iStepRef == 0) || (iStepRef & 3), OMX_Sts_BadArgErr) 72 armRetArgErrIf(armNot4ByteAligned(pSrcOrg), OMX_Sts_BadArgErr) 73 armRetArgErrIf(armNot4ByteAligned(pSrcRef), OMX_Sts_BadArgErr) 74 75 /* Calculate the difference */ 76 for (j = 0; j < 4; j++) 77 { 78 for (i = 0; i < 4; i++) 79 { 80 d [j][i] = pSrcOrg [j * iStepOrg + i] - pSrcRef [j * iStepRef + i]; 81 } 82 } 83 84 /* Hadamard Transfor for 4x4 block */ 85 86 /* Horizontal */ 87 for (i = 0; i < 4; i++) 88 { 89 m1[i][0] = d[i][0] + d[i][2]; /* a+c */ 90 m1[i][1] = d[i][1] + d[i][3]; /* b+d */ 91 m1[i][2] = d[i][0] - d[i][2]; /* a-c */ 92 m1[i][3] = d[i][1] - d[i][3]; /* b-d */ 93 94 m2[i][0] = m1[i][0] + m1[i][1]; /* a+b+c+d */ 95 m2[i][1] = m1[i][2] + m1[i][3]; /* a+b-c-d */ 96 m2[i][2] = m1[i][2] - m1[i][3]; /* a-b-c+d */ 97 m2[i][3] = m1[i][0] - m1[i][1]; /* a-b+c-d */ 98 99 } 100 101 /* Vertical */ 102 for (i = 0; i < 4; i++) 103 { 104 m1[0][i] = m2[0][i] + m2[2][i]; 105 m1[1][i] = m2[1][i] + m2[3][i]; 106 m1[2][i] = m2[0][i] - m2[2][i]; 107 m1[3][i] = m2[1][i] - m2[3][i]; 108 109 m2[0][i] = m1[0][i] + m1[1][i]; 110 m2[1][i] = m1[2][i] + m1[3][i]; 111 m2[2][i] = m1[2][i] - m1[3][i]; 112 m2[3][i] = m1[0][i] - m1[1][i]; 113 } 114 115 /* calculate SAD for Transformed coefficients */ 116 for (j = 0; j < 4; j++) 117 { 118 for (i = 0; i < 4; i++) 119 { 120 SATD += armAbs(m2 [j][i]); 121 } 122 } 123 124 *pDstSAD = (SATD + 1) / 2; 125 126 return OMX_Sts_NoErr; 127 } 128 129 /***************************************************************************** 130 * END OF FILE 131 *****************************************************************************/ 132 133
