1 /* 2 * Copyright (C) 2007-2008 ARM Limited 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 * 16 */ 17 /** 18 * 19 * File Name: omxVCM4P10_TransformQuant_ChromaDC.c 20 * OpenMAX DL: v1.0.2 21 * Revision: 9641 22 * Date: Thursday, February 7, 2008 23 * 24 * 25 * 26 * Description: 27 * This function will calculate 4x4 hadamard transform of chroma DC 28 * coefficients and quantization 29 * 30 */ 31 32 #include "omxtypes.h" 33 #include "armOMX.h" 34 #include "omxVC.h" 35 36 #include "armVC.h" 37 #include "armCOMM.h" 38 39 /** 40 * Function: omxVCM4P10_TransformQuant_ChromaDC (6.3.5.6.1) 41 * 42 * Description: 43 * This function performs 2x2 Hadamard transform of chroma DC coefficients 44 * and then quantizes the coefficients. 45 * 46 * Input Arguments: 47 * 48 * pSrcDst - Pointer to the 2x2 array of chroma DC coefficients. 8-byte 49 * alignment required. 50 * iQP - Quantization parameter; must be in the range [0,51]. 51 * bIntra - Indicate whether this is an INTRA block. 1-INTRA, 0-INTER 52 * 53 * Output Arguments: 54 * 55 * pSrcDst - Pointer to transformed and quantized coefficients. 8-byte 56 * alignment required. 57 * 58 * Return Value: 59 * 60 * OMX_Sts_NoErr - no error 61 * OMX_Sts_BadArgErr - bad arguments; returned if any of the following 62 * conditions are true: 63 * - at least one of the following pointers is NULL: 64 * pSrcDst 65 * - pSrcDst is not aligned on an 8-byte boundary 66 * 67 */ 68 OMXResult omxVCM4P10_TransformQuant_ChromaDC( 69 OMX_S16* pSrcDst, 70 OMX_U32 iQP, 71 OMX_U8 bIntra 72 ) 73 { 74 OMX_INT i, j; 75 OMX_S32 m[2][2]; 76 OMX_S32 Value; 77 OMX_S32 QbitsPlusOne, Two_f, MF00; 78 79 /* Check for argument error */ 80 armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr); 81 armRetArgErrIf(armNot8ByteAligned(pSrcDst), OMX_Sts_BadArgErr); 82 armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr); 83 84 /* Hadamard Transform for 2x2 block */ 85 m[0][0] = pSrcDst[0] + pSrcDst[1] + pSrcDst[2] + pSrcDst[3]; 86 m[0][1] = pSrcDst[0] - pSrcDst[1] + pSrcDst[2] - pSrcDst[3]; 87 m[1][0] = pSrcDst[0] + pSrcDst[1] - pSrcDst[2] - pSrcDst[3]; 88 m[1][1] = pSrcDst[0] - pSrcDst[1] - pSrcDst[2] + pSrcDst[3]; 89 90 /* Quantization */ 91 QbitsPlusOne = ARM_M4P10_Q_OFFSET + 1 + (iQP / 6); /*floor (QP/6)*/ 92 MF00 = armVCM4P10_MFMatrix [iQP % 6][0]; 93 94 Two_f = (1 << QbitsPlusOne) / (bIntra ? 3 : 6); /* 3->INTRA, 6->INTER */ 95 96 /* Scaling */ 97 for (j = 0; j < 2; j++) 98 { 99 for (i = 0; i < 2; i++) 100 { 101 Value = (armAbs(m[j][i]) * MF00 + Two_f) >> QbitsPlusOne; 102 pSrcDst[j * 2 + i] = (OMX_S16)((m[j][i] < 0) ? -Value : Value); 103 } 104 } 105 106 return OMX_Sts_NoErr; 107 } 108 109 /***************************************************************************** 110 * END OF FILE 111 *****************************************************************************/ 112 113
