1 /* ---------------------------------------------------------------- 2 * 3 * 4 * File Name: armVCM4P10_FwdTransformResidual4x4.c 5 * OpenMAX DL: v1.0.2 6 * Revision: 9641 7 * Date: Thursday, February 7, 2008 8 * 9 * (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. 10 * 11 * 12 * 13 * H.264 transform module 14 * 15 */ 16 17 #include "omxtypes.h" 18 #include "armOMX.h" 19 #include "omxVC.h" 20 21 #include "armCOMM.h" 22 #include "armVC.h" 23 24 /* 25 * Description: 26 * Forward Transform Residual 4x4 Coefficients 27 * 28 * Parameters: 29 * [in] pSrc Source 4x4 block 30 * [out] pDst Destination 4x4 block 31 * 32 */ 33 void armVCM4P10_FwdTransformResidual4x4(OMX_S16* pDst, OMX_S16 *pSrc) 34 { 35 int i; 36 37 /* Transform rows */ 38 for (i=0; i<16; i+=4) 39 { 40 int d0 = pSrc[i+0]; 41 int d1 = pSrc[i+1]; 42 int d2 = pSrc[i+2]; 43 int d3 = pSrc[i+3]; 44 int e0 = d0 + d3; 45 int e1 = d0 - d3; 46 int e2 = d1 + d2; 47 int e3 = d1 - d2; 48 int f0 = e0 + e2; 49 int f1 = (e1 << 1) + e3; 50 int f2 = e0 - e2; 51 int f3 = e1 - (e3 << 1); 52 pDst[i+0] = (OMX_S16)f0; 53 pDst[i+1] = (OMX_S16)f1; 54 pDst[i+2] = (OMX_S16)f2; 55 pDst[i+3] = (OMX_S16)f3; 56 } 57 58 /* Transform columns */ 59 for (i=0; i<4; i++) 60 { 61 int f0 = pDst[i+0]; 62 int f1 = pDst[i+4]; 63 int f2 = pDst[i+8]; 64 int f3 = pDst[i+12]; 65 int g0 = f0 + f3; 66 int g1 = f0 - f3; 67 int g2 = f1 + f2; 68 int g3 = f1 - f2; 69 int h0 = g0 + g2; 70 int h1 = (g1 << 1) + g3; 71 int h2 = g0 - g2; 72 int h3 = g1 - (g3 << 1); 73 pDst[i+0] = (OMX_S16) h0; 74 pDst[i+4] = (OMX_S16) h1; 75 pDst[i+8] = (OMX_S16) h2; 76 pDst[i+12] = (OMX_S16) h3; 77 } 78 } 79
