10c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 20c1bc742181ded4930842b46e9507372f0b1b963James Dong * 30c1bc742181ded4930842b46e9507372f0b1b963James Dong * File Name: omxVCM4P2_DCT8x8blk.c 40c1bc742181ded4930842b46e9507372f0b1b963James Dong * OpenMAX DL: v1.0.2 50c1bc742181ded4930842b46e9507372f0b1b963James Dong * Revision: 9641 60c1bc742181ded4930842b46e9507372f0b1b963James Dong * Date: Thursday, February 7, 2008 70c1bc742181ded4930842b46e9507372f0b1b963James Dong * 80c1bc742181ded4930842b46e9507372f0b1b963James Dong * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 90c1bc742181ded4930842b46e9507372f0b1b963James Dong * 100c1bc742181ded4930842b46e9507372f0b1b963James Dong * 110c1bc742181ded4930842b46e9507372f0b1b963James Dong * 120c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 130c1bc742181ded4930842b46e9507372f0b1b963James Dong * Contains modules for 8x8 block DCT 140c1bc742181ded4930842b46e9507372f0b1b963James Dong * 150c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 160c1bc742181ded4930842b46e9507372f0b1b963James Dong 170c1bc742181ded4930842b46e9507372f0b1b963James Dong#include <math.h> 180c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "omxtypes.h" 190c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armOMX.h" 200c1bc742181ded4930842b46e9507372f0b1b963James Dong 210c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armCOMM.h" 220c1bc742181ded4930842b46e9507372f0b1b963James Dong#include "armVCM4P2_DCT_Table.h" 230c1bc742181ded4930842b46e9507372f0b1b963James Dong 240c1bc742181ded4930842b46e9507372f0b1b963James Dong/** 250c1bc742181ded4930842b46e9507372f0b1b963James Dong * Function: omxVCM4P2_DCT8x8blk (6.2.4.4.1) 260c1bc742181ded4930842b46e9507372f0b1b963James Dong * 270c1bc742181ded4930842b46e9507372f0b1b963James Dong * Description: 280c1bc742181ded4930842b46e9507372f0b1b963James Dong * Computes a 2D forward DCT for a single 8x8 block, as defined in 290c1bc742181ded4930842b46e9507372f0b1b963James Dong * [ISO14496-2]. 300c1bc742181ded4930842b46e9507372f0b1b963James Dong * 310c1bc742181ded4930842b46e9507372f0b1b963James Dong * Input Arguments: 320c1bc742181ded4930842b46e9507372f0b1b963James Dong * 330c1bc742181ded4930842b46e9507372f0b1b963James Dong * pSrc - pointer to the start of the linearly arranged input buffer; must 340c1bc742181ded4930842b46e9507372f0b1b963James Dong * be aligned on a 16-byte boundary. Input values (pixel 350c1bc742181ded4930842b46e9507372f0b1b963James Dong * intensities) are valid in the range [-255,255]. 360c1bc742181ded4930842b46e9507372f0b1b963James Dong * 370c1bc742181ded4930842b46e9507372f0b1b963James Dong * Output Arguments: 380c1bc742181ded4930842b46e9507372f0b1b963James Dong * 390c1bc742181ded4930842b46e9507372f0b1b963James Dong * pDst - pointer to the start of the linearly arranged output buffer; must 400c1bc742181ded4930842b46e9507372f0b1b963James Dong * be aligned on a 16-byte boundary. 410c1bc742181ded4930842b46e9507372f0b1b963James Dong * 420c1bc742181ded4930842b46e9507372f0b1b963James Dong * Return Value: 430c1bc742181ded4930842b46e9507372f0b1b963James Dong * 440c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_NoErr - no error 450c1bc742181ded4930842b46e9507372f0b1b963James Dong * OMX_Sts_BadArgErr - bad arguments, returned if: 460c1bc742181ded4930842b46e9507372f0b1b963James Dong * - pSrc or pDst is NULL. 470c1bc742181ded4930842b46e9507372f0b1b963James Dong * - pSrc or pDst is not 16-byte aligned. 480c1bc742181ded4930842b46e9507372f0b1b963James Dong * 490c1bc742181ded4930842b46e9507372f0b1b963James Dong */ 500c1bc742181ded4930842b46e9507372f0b1b963James Dong 510c1bc742181ded4930842b46e9507372f0b1b963James DongOMXResult omxVCM4P2_DCT8x8blk (const OMX_S16 *pSrc, OMX_S16 *pDst) 520c1bc742181ded4930842b46e9507372f0b1b963James Dong{ 530c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_INT x, y, u, v; 540c1bc742181ded4930842b46e9507372f0b1b963James Dong 550c1bc742181ded4930842b46e9507372f0b1b963James Dong /* Argument error checks */ 560c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pSrc == NULL, OMX_Sts_BadArgErr); 570c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(!armIs16ByteAligned(pSrc), OMX_Sts_BadArgErr); 580c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr); 590c1bc742181ded4930842b46e9507372f0b1b963James Dong armRetArgErrIf(!armIs16ByteAligned(pDst), OMX_Sts_BadArgErr); 600c1bc742181ded4930842b46e9507372f0b1b963James Dong 610c1bc742181ded4930842b46e9507372f0b1b963James Dong 620c1bc742181ded4930842b46e9507372f0b1b963James Dong for (u = 0; u < 8; u++) 630c1bc742181ded4930842b46e9507372f0b1b963James Dong { 640c1bc742181ded4930842b46e9507372f0b1b963James Dong for (v = 0; v < 8; v++) 650c1bc742181ded4930842b46e9507372f0b1b963James Dong { 660c1bc742181ded4930842b46e9507372f0b1b963James Dong OMX_F64 sum = 0.0; 670c1bc742181ded4930842b46e9507372f0b1b963James Dong for (x = 0; x < 8; x++) 680c1bc742181ded4930842b46e9507372f0b1b963James Dong { 690c1bc742181ded4930842b46e9507372f0b1b963James Dong for (y = 0; y < 8; y++) 700c1bc742181ded4930842b46e9507372f0b1b963James Dong { 710c1bc742181ded4930842b46e9507372f0b1b963James Dong sum += pSrc[(x * 8) + y] * 720c1bc742181ded4930842b46e9507372f0b1b963James Dong armVCM4P2_preCalcDCTCos[x][u] * 730c1bc742181ded4930842b46e9507372f0b1b963James Dong armVCM4P2_preCalcDCTCos[y][v]; 740c1bc742181ded4930842b46e9507372f0b1b963James Dong } 750c1bc742181ded4930842b46e9507372f0b1b963James Dong } 760c1bc742181ded4930842b46e9507372f0b1b963James Dong pDst[(u * 8) + v]= armRoundFloatToS16 (sum); 770c1bc742181ded4930842b46e9507372f0b1b963James Dong } 780c1bc742181ded4930842b46e9507372f0b1b963James Dong } 790c1bc742181ded4930842b46e9507372f0b1b963James Dong 800c1bc742181ded4930842b46e9507372f0b1b963James Dong return OMX_Sts_NoErr; 810c1bc742181ded4930842b46e9507372f0b1b963James Dong} 820c1bc742181ded4930842b46e9507372f0b1b963James Dong 830c1bc742181ded4930842b46e9507372f0b1b963James Dong 840c1bc742181ded4930842b46e9507372f0b1b963James Dong 850c1bc742181ded4930842b46e9507372f0b1b963James Dong/* End of file */ 860c1bc742181ded4930842b46e9507372f0b1b963James Dong 870c1bc742181ded4930842b46e9507372f0b1b963James Dong 88