| /* |
| * 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: omxVCM4P2_DCT8x8blk.c |
| * OpenMAX DL: v1.0.2 |
| * Revision: 9641 |
| * Date: Thursday, February 7, 2008 |
| * |
| * |
| * |
| * |
| * Description: |
| * Contains modules for 8x8 block DCT |
| * |
| */ |
| |
| #include <math.h> |
| #include "omxtypes.h" |
| #include "armOMX.h" |
| |
| #include "armCOMM.h" |
| #include "armVCM4P2_DCT_Table.h" |
| |
| /** |
| * Function: omxVCM4P2_DCT8x8blk (6.2.4.4.1) |
| * |
| * Description: |
| * Computes a 2D forward DCT for a single 8x8 block, as defined in |
| * [ISO14496-2]. |
| * |
| * Input Arguments: |
| * |
| * pSrc - pointer to the start of the linearly arranged input buffer; must |
| * be aligned on a 16-byte boundary. Input values (pixel |
| * intensities) are valid in the range [-255,255]. |
| * |
| * Output Arguments: |
| * |
| * pDst - pointer to the start of the linearly arranged output buffer; must |
| * be aligned on a 16-byte boundary. |
| * |
| * Return Value: |
| * |
| * OMX_Sts_NoErr - no error |
| * OMX_Sts_BadArgErr - bad arguments, returned if: |
| * - pSrc or pDst is NULL. |
| * - pSrc or pDst is not 16-byte aligned. |
| * |
| */ |
| |
| OMXResult omxVCM4P2_DCT8x8blk (const OMX_S16 *pSrc, OMX_S16 *pDst) |
| { |
| OMX_INT x, y, u, v; |
| |
| /* Argument error checks */ |
| armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(!armIs16ByteAligned(pSrc), OMX_Sts_BadArgErr); |
| armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr); |
| armRetArgErrIf(!armIs16ByteAligned(pDst), OMX_Sts_BadArgErr); |
| |
| |
| for (u = 0; u < 8; u++) |
| { |
| for (v = 0; v < 8; v++) |
| { |
| OMX_F64 sum = 0.0; |
| for (x = 0; x < 8; x++) |
| { |
| for (y = 0; y < 8; y++) |
| { |
| sum += pSrc[(x * 8) + y] * |
| armVCM4P2_preCalcDCTCos[x][u] * |
| armVCM4P2_preCalcDCTCos[y][v]; |
| } |
| } |
| pDst[(u * 8) + v]= armRoundFloatToS16 (sum); |
| } |
| } |
| |
| return OMX_Sts_NoErr; |
| } |
| |
| |
| |
| /* End of file */ |
| |
| |