| /* |
| * Copyright (C) 2007-2008 ARM Limited |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| /** |
| * |
| * File Name: omxVCM4P10_TransformQuant_LumaDC.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * Description: |
| * This function will calculate 4x4 hadamard transform of luma DC coefficients |
| * and quantization |
| * |
| */ |
| |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| #include "omxVC.h" |
| |
| #include "armCOMM.h" |
| #include "armVC.h" |
| |
| /** |
| * Function: omxVCM4P10_TransformQuant_LumaDC (6.3.5.6.2) |
| * |
| * Description: |
| * This function performs a 4x4 Hadamard transform of luma DC coefficients |
| * and then quantizes the coefficients. |
| * |
| * Input Arguments: |
| * |
| * pSrcDst - Pointer to the 4x4 array of luma DC coefficients. 16-byte |
| * alignment required. |
| * iQP - Quantization parameter; must be in the range [0,51]. |
| * |
| * Output Arguments: |
| * |
| * pSrcDst - Pointer to transformed and quantized coefficients. 16-byte |
| * alignment required. |
| * |
| * Return Value: |
| * |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - bad arguments; returned if any of the following |
| * conditions are true: |
| * - at least one of the following pointers is NULL: pSrcDst |
| * - pSrcDst is not aligned on an 16-byte boundary |
| * |
| */ |
| OMXResult omxVCM4P10_TransformQuant_LumaDC( |
| OMX_S16* pSrcDst, |
| OMX_U32 iQP |
| ) |
| { |
| OMX_INT i, j; |
| OMX_S32 m1[4][4], m2[4][4]; |
| OMX_S32 Value; |
| OMX_U32 QbitsPlusOne, Two_f, MF; |
| |
| /* Check for argument error */ |
| armRetArgErrIf(pSrcDst == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(armNot16ByteAligned(pSrcDst), OMX_Sts_BadArgErr); |
| armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr); |
| |
| /* Hadamard Transform for 4x4 block */ |
| /* Horizontal Hadamard */ |
| for (i = 0; i < 4; i++) |
| { |
| j = i * 4; |
| |
| m1[i][0] = pSrcDst[j + 0] + pSrcDst[j + 2]; /* a+c */ |
| m1[i][1] = pSrcDst[j + 1] + pSrcDst[j + 3]; /* b+d */ |
| m1[i][2] = pSrcDst[j + 0] - pSrcDst[j + 2]; /* a-c */ |
| m1[i][3] = pSrcDst[j + 1] - pSrcDst[j + 3]; /* b-d */ |
| |
| m2[i][0] = m1[i][0] + m1[i][1]; /* a+b+c+d */ |
| m2[i][1] = m1[i][2] + m1[i][3]; /* a+b-c-d */ |
| m2[i][2] = m1[i][2] - m1[i][3]; /* a-b-c+d */ |
| m2[i][3] = m1[i][0] - m1[i][1]; /* a-b+c-d */ |
| |
| } |
| |
| /* Vertical */ |
| for (i = 0; i < 4; i++) |
| { |
| m1[0][i] = m2[0][i] + m2[2][i]; |
| m1[1][i] = m2[1][i] + m2[3][i]; |
| m1[2][i] = m2[0][i] - m2[2][i]; |
| m1[3][i] = m2[1][i] - m2[3][i]; |
| |
| m2[0][i] = m1[0][i] + m1[1][i]; |
| m2[1][i] = m1[2][i] + m1[3][i]; |
| m2[2][i] = m1[2][i] - m1[3][i]; |
| m2[3][i] = m1[0][i] - m1[1][i]; |
| } |
| |
| |
| /* Quantization */ |
| QbitsPlusOne = ARM_M4P10_Q_OFFSET + 1 + (iQP / 6); /*floor (QP/6)*/ |
| Two_f = (1 << QbitsPlusOne) / 3; /* 3->INTRA, 6->INTER */ |
| MF = armVCM4P10_MFMatrix [iQP % 6][0]; |
| |
| /* Scaling */ |
| for (j = 0; j < 4; j++) |
| { |
| for (i = 0; i < 4; i++) |
| { |
| Value = (armAbs((m2[j][i]/* + 1*/) / 2) * MF + Two_f) >> QbitsPlusOne; |
| pSrcDst[j * 4 + i] = (OMX_S16)((m2[j][i] < 0) ? -Value : Value); |
| } |
| } |
| return OMX_Sts_NoErr; |
| } |
| |
| /***************************************************************************** |
| * END OF FILE |
| *****************************************************************************/ |
| |