| /* |
| * 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_InvTransformDequant_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_InvTransformDequant_LumaDC (6.3.5.6.3) |
| * |
| * Description: |
| * This function performs inverse 4x4 Hadamard transform and then dequantizes |
| * the coefficients. |
| * |
| * Input Arguments: |
| * |
| * pSrc - Pointer to the 4x4 array of the 4x4 Hadamard-transformed and |
| * quantized coefficients. 16 byte alignment required. |
| * iQP - Quantization parameter; must be in the range [0,51]. |
| * |
| * Output Arguments: |
| * |
| * pDst - Pointer to inverse-transformed and dequantized 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: pSrc |
| * - pSrc or pDst is not aligned on a 16-byte boundary |
| * |
| */ |
| OMXResult omxVCM4P10_InvTransformDequant_LumaDC( |
| const OMX_S16* pSrc, |
| OMX_S16* pDst, |
| OMX_U32 iQP |
| ) |
| { |
| OMX_INT i, j; |
| OMX_S32 m1[4][4], m2[4][4], Value; |
| OMX_S32 QPer, V; |
| |
| /* check for argument error */ |
| armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr) |
| armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr) |
| armRetArgErrIf(iQP > 51, OMX_Sts_BadArgErr) |
| armRetArgErrIf(armNot16ByteAligned(pSrc), OMX_Sts_BadArgErr) |
| armRetArgErrIf(armNot16ByteAligned(pDst), OMX_Sts_BadArgErr) |
| |
| /* Inv Hadamard Transform for DC Luma 4x4 block */ |
| /* Horizontal */ |
| for (i = 0; i < 4; i++) |
| { |
| j = i * 4; |
| |
| m1[i][0] = pSrc[j + 0] + pSrc[j + 2]; /* a+c */ |
| m1[i][1] = pSrc[j + 1] + pSrc[j + 3]; /* b+d */ |
| m1[i][2] = pSrc[j + 0] - pSrc[j + 2]; /* a-c */ |
| m1[i][3] = pSrc[j + 1] - pSrc[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]; |
| } |
| |
| |
| /* Scaling */ |
| QPer = iQP / 6; |
| V = armVCM4P10_VMatrix [iQP % 6][0]; |
| |
| for (j = 0; j < 4; j++) |
| { |
| for (i = 0; i < 4; i++) |
| { |
| if (QPer < 2) |
| { |
| Value = (m2[j][i] * V + (1 << (1 - QPer))) >> (2 - QPer); |
| } |
| else |
| { |
| Value = m2[j][i] * V * (1 << (QPer - 2)); |
| } |
| |
| pDst[j * 4 + i] = (OMX_S16) Value; |
| |
| } |
| } |
| return OMX_Sts_NoErr; |
| } |
| |
| /***************************************************************************** |
| * END OF FILE |
| *****************************************************************************/ |
| |