1 /** 2 * 3 * File Name: omxVCM4P10_TransformQuant_ChromaDC.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 4x4 hadamard transform of chroma DC 13 * coefficients and quantization 14 * 15 */ 16 17 #include "omxtypes.h" 18 #include "armOMX.h" 19 #include "omxVC.h" 20 21 #include "armVC.h" 22 #include "armCOMM.h" 23 24 /** 25 * Function: omxVCM4P10_TransformQuant_ChromaDC (6.3.5.6.1) 26 * 27 * Description: 28 * This function performs 2x2 Hadamard transform of chroma DC coefficients 29 * and then quantizes the coefficients. 30 * 31 * Input Arguments: 32 * 33 * pSrcDst - Pointer to the 2x2 array of chroma DC coefficients. 8-byte 34 * alignment required. 35 * iQP - Quantization parameter; must be in the range [0,51]. 36 * bIntra - Indicate whether this is an INTRA block. 1-INTRA, 0-INTER 37 * 38 * Output Arguments: 39 * 40 * pSrcDst - Pointer to transformed and quantized coefficients. 8-byte 41 * alignment required. 42 * 43 * Return Value: 44 * 45 * OMX_Sts_NoErr - no error 46 * OMX_Sts_BadArgErr - bad arguments; returned if any of the following 47 * conditions are true: 48 * - at least one of the following pointers is NULL: 49 * pSrcDst 50 * - pSrcDst is not aligned on an 8-byte boundary 51 * 52 */ 53 OMXResult omxVCM4P10_TransformQuant_ChromaDC( 54 OMX_S16* pSrcDst, 55 OMX_U32 iQP, 56 OMX_U8 bIntra 57 ) 58 { 59 OMX_INT i, j; 60 OMX_S32 m[2][2]; 61 OMX_S32 Value; 62 OMX_S32 QbitsPlusOne, Two_f, MF00; 63 64 /* Check for argument error */ 65 armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr); 66 armRetArgErrIf(armNot8ByteAligned(pSrcDst), OMX_Sts_BadArgErr); 67 armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr); 68 69 /* Hadamard Transform for 2x2 block */ 70 m[0][0] = pSrcDst[0] + pSrcDst[1] + pSrcDst[2] + pSrcDst[3]; 71 m[0][1] = pSrcDst[0] - pSrcDst[1] + pSrcDst[2] - pSrcDst[3]; 72 m[1][0] = pSrcDst[0] + pSrcDst[1] - pSrcDst[2] - pSrcDst[3]; 73 m[1][1] = pSrcDst[0] - pSrcDst[1] - pSrcDst[2] + pSrcDst[3]; 74 75 /* Quantization */ 76 QbitsPlusOne = ARM_M4P10_Q_OFFSET + 1 + (iQP / 6); /*floor (QP/6)*/ 77 MF00 = armVCM4P10_MFMatrix [iQP % 6][0]; 78 79 Two_f = (1 << QbitsPlusOne) / (bIntra ? 3 : 6); /* 3->INTRA, 6->INTER */ 80 81 /* Scaling */ 82 for (j = 0; j < 2; j++) 83 { 84 for (i = 0; i < 2; i++) 85 { 86 Value = (armAbs(m[j][i]) * MF00 + Two_f) >> QbitsPlusOne; 87 pSrcDst[j * 2 + i] = (OMX_S16)((m[j][i] < 0) ? -Value : Value); 88 } 89 } 90 91 return OMX_Sts_NoErr; 92 } 93 94 /***************************************************************************** 95 * END OF FILE 96 *****************************************************************************/ 97 98
