1/* 2 * Copyright (C) 2004-2010 NXP Software 3 * Copyright (C) 2010 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18#include "BIQUAD.h" 19#include "BP_1I_D32F32Cll_TRC_WRA_02_Private.h" 20#include "LVM_Macros.h" 21 22 23/************************************************************************** 24 ASSUMPTIONS: 25 COEFS- 26 pBiquadState->coefs[0] is A0, 27 pBiquadState->coefs[1] is -B2, 28 pBiquadState->coefs[2] is -B1, these are in Q30 format 29 30 DELAYS- 31 pBiquadState->pDelays[0] is x(n-1)L in Q0 format 32 pBiquadState->pDelays[1] is x(n-2)L in Q0 format 33 pBiquadState->pDelays[2] is y(n-1)L in Q0 format 34 pBiquadState->pDelays[3] is y(n-2)L in Q0 format 35***************************************************************************/ 36#ifdef BUILD_FLOAT 37void BP_1I_D32F32C30_TRC_WRA_02 ( Biquad_FLOAT_Instance_t *pInstance, 38 LVM_FLOAT *pDataIn, 39 LVM_FLOAT *pDataOut, 40 LVM_INT16 NrSamples) 41 { 42 LVM_FLOAT ynL,templ; 43 LVM_INT16 ii; 44 PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance; 45 46 for (ii = NrSamples; ii != 0; ii--) 47 { 48 49 50 /************************************************************************** 51 PROCESSING OF THE LEFT CHANNEL 52 ***************************************************************************/ 53 // ynL= (A0 * (x(n)L - x(n-2)L ) ) 54 templ = (*pDataIn) - pBiquadState->pDelays[1]; 55 ynL = pBiquadState->coefs[0] * templ; 56 57 // ynL+= ((-B2 * y(n-2)L ) ) 58 templ = pBiquadState->coefs[1] * pBiquadState->pDelays[3]; 59 ynL += templ; 60 61 // ynL+= ((-B1 * y(n-1)L ) ) 62 templ = pBiquadState->coefs[2] * pBiquadState->pDelays[2]; 63 ynL += templ; 64 65 /************************************************************************** 66 UPDATING THE DELAYS 67 ***************************************************************************/ 68 pBiquadState->pDelays[3] = pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L 69 pBiquadState->pDelays[1] = pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 70 pBiquadState->pDelays[2] = ynL; // Update y(n-1)L 71 pBiquadState->pDelays[0] = (*pDataIn++); // Update x(n-1)L 72 73 /************************************************************************** 74 WRITING THE OUTPUT 75 ***************************************************************************/ 76 *pDataOut++ = ynL; // Write Left output in Q0 77 78 } 79 80 } 81#else 82void BP_1I_D32F32C30_TRC_WRA_02 ( Biquad_Instance_t *pInstance, 83 LVM_INT32 *pDataIn, 84 LVM_INT32 *pDataOut, 85 LVM_INT16 NrSamples) 86 { 87 LVM_INT32 ynL,templ; 88 LVM_INT16 ii; 89 PFilter_State pBiquadState = (PFilter_State) pInstance; 90 91 for (ii = NrSamples; ii != 0; ii--) 92 { 93 94 95 /************************************************************************** 96 PROCESSING OF THE LEFT CHANNEL 97 ***************************************************************************/ 98 // ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>30) in Q0 99 templ=(*pDataIn)-pBiquadState->pDelays[1]; 100 MUL32x32INTO32(pBiquadState->coefs[0],templ,ynL,30) 101 102 // ynL+= ((-B2 (Q30) * y(n-2)L (Q0) ) >>30) in Q0 103 MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[3],templ,30) 104 ynL+=templ; 105 106 // ynL+= ((-B1 (Q30) * y(n-1)L (Q0) ) >>30) in Q0 107 MUL32x32INTO32(pBiquadState->coefs[2],pBiquadState->pDelays[2],templ,30) 108 ynL+=templ; 109 110 /************************************************************************** 111 UPDATING THE DELAYS 112 ***************************************************************************/ 113 pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L 114 pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L 115 pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q0 116 pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 117 118 /************************************************************************** 119 WRITING THE OUTPUT 120 ***************************************************************************/ 121 *pDataOut++=ynL; // Write Left output in Q0 122 123 } 124 125 } 126#endif 127