178e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar/* 278e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * Copyright (C) 2007-2008 ARM Limited 378e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 478e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * Licensed under the Apache License, Version 2.0 (the "License"); 578e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * you may not use this file except in compliance with the License. 678e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * You may obtain a copy of the License at 778e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 878e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * http://www.apache.org/licenses/LICENSE-2.0 978e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 1078e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * Unless required by applicable law or agreed to in writing, software 1178e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * distributed under the License is distributed on an "AS IS" BASIS, 1278e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1378e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * See the License for the specific language governing permissions and 1478e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * limitations under the License. 1578e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar * 1678e52bfac041d71ce53b5b13c2abf78af742b09dLajos Molnar */ 170c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 180c1bc742181ded4930842b46e9507372f0b1b963James Dong * 190c1bc742181ded4930842b46e9507372f0b1b963James Dong * File Name: omxVCM4P2_IDCT8x8blk.c 200c1bc742181ded4930842b46e9507372f0b1b963James Dong * OpenMAX DL: v1.0.2 210c1bc742181ded4930842b46e9507372f0b1b963James Dong * Revision: 9641 220c1bc742181ded4930842b46e9507372f0b1b963James Dong * Date: Thursday, February 7, 2008 230c1bc742181ded4930842b46e9507372f0b1b963James Dong * 240c1bc742181ded4930842b46e9507372f0b1b963James Dong * 250c1bc742181ded4930842b46e9507372f0b1b963James Dong * 260c1bc742181ded4930842b46e9507372f0b1b963James Dong * 270c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 280c1bc742181ded4930842b46e9507372f0b1b963James Dong * Contains modules for 8x8 block IDCT 290c1bc742181ded4930842b46e9507372f0b1b963James Dong * 300c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 310c1bc742181ded4930842b46e9507372f0b1b963James Dong 320c1bc742181ded4930842b46e9507372f0b1b963James Dong 330c1bc742181ded4930842b46e9507372f0b1b963James Dong#include <math.h> 340c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxtypes.h" 350c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armOMX.h" 360c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxVC.h" 370c1bc742181ded4930842b46e9507372f0b1b963James Dong 380c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armCOMM.h" 390c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armVCM4P2_DCT_Table.h" 400c1bc742181ded4930842b46e9507372f0b1b963James Dong 410c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 420c1bc742181ded4930842b46e9507372f0b1b963James Dong * Function: omxVCM4P2_IDCT8x8blk (6.2.3.2.1) 430c1bc742181ded4930842b46e9507372f0b1b963James Dong * 440c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 450c1bc742181ded4930842b46e9507372f0b1b963James Dong * Computes a 2D inverse DCT for a single 8x8 block, as defined in 460c1bc742181ded4930842b46e9507372f0b1b963James Dong * [ISO14496-2]. 470c1bc742181ded4930842b46e9507372f0b1b963James Dong * 480c1bc742181ded4930842b46e9507372f0b1b963James Dong * Input Arguments: 490c1bc742181ded4930842b46e9507372f0b1b963James Dong * 500c1bc742181ded4930842b46e9507372f0b1b963James Dong * pSrc - pointer to the start of the linearly arranged IDCT input buffer; 510c1bc742181ded4930842b46e9507372f0b1b963James Dong * must be aligned on a 16-byte boundary. According to 520c1bc742181ded4930842b46e9507372f0b1b963James Dong * [ISO14496-2], the input coefficient values should lie within the 530c1bc742181ded4930842b46e9507372f0b1b963James Dong * range [-2048, 2047]. 540c1bc742181ded4930842b46e9507372f0b1b963James Dong * 550c1bc742181ded4930842b46e9507372f0b1b963James Dong * Output Arguments: 560c1bc742181ded4930842b46e9507372f0b1b963James Dong * 570c1bc742181ded4930842b46e9507372f0b1b963James Dong * pDst - pointer to the start of the linearly arranged IDCT output buffer; 580c1bc742181ded4930842b46e9507372f0b1b963James Dong * must be aligned on a 16-byte boundary. 590c1bc742181ded4930842b46e9507372f0b1b963James Dong * 600c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value: 610c1bc742181ded4930842b46e9507372f0b1b963James Dong * 620c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_NoErr - no error 630c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_BadArgErr - bad arguments: 640c1bc742181ded4930842b46e9507372f0b1b963James Dong * - pSrc or pDst is NULL. 650c1bc742181ded4930842b46e9507372f0b1b963James Dong * - pSrc or pDst is not 16-byte aligned. 660c1bc742181ded4930842b46e9507372f0b1b963James Dong * 670c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 680c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P2_IDCT8x8blk (const OMX_S16 *pSrc, OMX_S16 *pDst) 690c1bc742181ded4930842b46e9507372f0b1b963James Dong{ 700c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_INT x, y, u, v; 710c1bc742181ded4930842b46e9507372f0b1b963James Dong 720c1bc742181ded4930842b46e9507372f0b1b963James Dong /* Argument error checks */ 730c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr); 740c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(!armIs16ByteAligned(pSrc), OMX_Sts_BadArgErr); 750c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr); 760c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(!armIs16ByteAligned(pDst), OMX_Sts_BadArgErr); 770c1bc742181ded4930842b46e9507372f0b1b963James Dong 780c1bc742181ded4930842b46e9507372f0b1b963James Dong for (x = 0; x < 8; x++) 790c1bc742181ded4930842b46e9507372f0b1b963James Dong { 800c1bc742181ded4930842b46e9507372f0b1b963James Dong for (y = 0; y < 8; y++) 810c1bc742181ded4930842b46e9507372f0b1b963James Dong { 820c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_F64 sum = 0.0; 830c1bc742181ded4930842b46e9507372f0b1b963James Dong for (u = 0; u < 8; u++) 840c1bc742181ded4930842b46e9507372f0b1b963James Dong { 850c1bc742181ded4930842b46e9507372f0b1b963James Dong for (v = 0; v < 8; v++) 860c1bc742181ded4930842b46e9507372f0b1b963James Dong { 870c1bc742181ded4930842b46e9507372f0b1b963James Dong sum += pSrc[(u * 8) + v] * 880c1bc742181ded4930842b46e9507372f0b1b963James Dong armVCM4P2_preCalcDCTCos[x][u] * 890c1bc742181ded4930842b46e9507372f0b1b963James Dong armVCM4P2_preCalcDCTCos[y][v]; 900c1bc742181ded4930842b46e9507372f0b1b963James Dong } 910c1bc742181ded4930842b46e9507372f0b1b963James Dong } 920c1bc742181ded4930842b46e9507372f0b1b963James Dong pDst[(x * 8) + y] = (OMX_S16) floor(sum + 0.5); 930c1bc742181ded4930842b46e9507372f0b1b963James Dong 940c1bc742181ded4930842b46e9507372f0b1b963James Dong /* Saturate to [-256, 255] */ 950c1bc742181ded4930842b46e9507372f0b1b963James Dong pDst[(x * 8) + y] = armClip ( 960c1bc742181ded4930842b46e9507372f0b1b963James Dong -256, 970c1bc742181ded4930842b46e9507372f0b1b963James Dong 255, 980c1bc742181ded4930842b46e9507372f0b1b963James Dong pDst[(x * 8) + y]); 990c1bc742181ded4930842b46e9507372f0b1b963James Dong } 1000c1bc742181ded4930842b46e9507372f0b1b963James Dong } 1010c1bc742181ded4930842b46e9507372f0b1b963James Dong 1020c1bc742181ded4930842b46e9507372f0b1b963James Dong return OMX_Sts_NoErr; 1030c1bc742181ded4930842b46e9507372f0b1b963James Dong} 1040c1bc742181ded4930842b46e9507372f0b1b963James Dong 1050c1bc742181ded4930842b46e9507372f0b1b963James Dong/* End of file */ 1060c1bc742181ded4930842b46e9507372f0b1b963James Dong 1070c1bc742181ded4930842b46e9507372f0b1b963James Dong 108