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 "BQ_2I_D32F32Cll_TRC_WRA_01_Private.h" 20 #include "LVM_Macros.h" 21 22 /************************************************************************** 23 ASSUMPTIONS: 24 COEFS- 25 pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1 26 pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2 27 pBiquadState->coefs[4] is -B1, these are in Q30 format 28 29 DELAYS- 30 pBiquadState->pDelays[0] is x(n-1)L in Q0 format 31 pBiquadState->pDelays[1] is x(n-1)R in Q0 format 32 pBiquadState->pDelays[2] is x(n-2)L in Q0 format 33 pBiquadState->pDelays[3] is x(n-2)R in Q0 format 34 pBiquadState->pDelays[4] is y(n-1)L in Q0 format 35 pBiquadState->pDelays[5] is y(n-1)R in Q0 format 36 pBiquadState->pDelays[6] is y(n-2)L in Q0 format 37 pBiquadState->pDelays[7] is y(n-2)R in Q0 format 38 ***************************************************************************/ 39 40 void BQ_2I_D32F32C30_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 41 LVM_INT32 *pDataIn, 42 LVM_INT32 *pDataOut, 43 LVM_INT16 NrSamples) 44 45 46 { 47 LVM_INT32 ynL,ynR,templ,tempd; 48 LVM_INT16 ii; 49 PFilter_State pBiquadState = (PFilter_State) pInstance; 50 51 for (ii = NrSamples; ii != 0; ii--) 52 { 53 54 55 /************************************************************************** 56 PROCESSING OF THE LEFT CHANNEL 57 ***************************************************************************/ 58 /* ynL= ( A2 (Q30) * x(n-2)L (Q0) ) >>30 in Q0*/ 59 MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[2],ynL,30) 60 61 /* ynL+= ( A1 (Q30) * x(n-1)L (Q0) ) >> 30 in Q0*/ 62 MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[0],templ,30) 63 ynL+=templ; 64 65 /* ynL+= ( A0 (Q30) * x(n)L (Q0) ) >> 30 in Q0*/ 66 MUL32x32INTO32(pBiquadState->coefs[2],*pDataIn,templ,30) 67 ynL+=templ; 68 69 /* ynL+= (-B2 (Q30) * y(n-2)L (Q0) ) >> 30 in Q0*/ 70 MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[6],templ,30) 71 ynL+=templ; 72 73 /* ynL+= (-B1 (Q30) * y(n-1)L (Q0) ) >> 30 in Q0 */ 74 MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[4],templ,30) 75 ynL+=templ; 76 77 /************************************************************************** 78 PROCESSING OF THE RIGHT CHANNEL 79 ***************************************************************************/ 80 /* ynR= ( A2 (Q30) * x(n-2)R (Q0) ) >> 30 in Q0*/ 81 MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[3],ynR,30) 82 83 /* ynR+= ( A1 (Q30) * x(n-1)R (Q0) ) >> 30 in Q0*/ 84 MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[1],templ,30) 85 ynR+=templ; 86 87 /* ynR+= ( A0 (Q30) * x(n)R (Q0) ) >> 30 in Q0*/ 88 tempd=*(pDataIn+1); 89 MUL32x32INTO32(pBiquadState->coefs[2],tempd,templ,30) 90 ynR+=templ; 91 92 /* ynR+= (-B2 (Q30) * y(n-2)R (Q0) ) >> 30 in Q0*/ 93 MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[7],templ,30) 94 ynR+=templ; 95 96 /* ynR+= (-B1 (Q30) * y(n-1)R (Q0) ) >> 30 in Q0 */ 97 MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[5],templ,30) 98 ynR+=templ; 99 100 /************************************************************************** 101 UPDATING THE DELAYS 102 ***************************************************************************/ 103 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 104 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 105 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 106 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 107 pBiquadState->pDelays[5]=(LVM_INT32)ynR; /* Update y(n-1)R in Q0*/ 108 pBiquadState->pDelays[4]=(LVM_INT32)ynL; /* Update y(n-1)L in Q0*/ 109 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 110 pDataIn++; 111 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 112 pDataIn++; 113 114 /************************************************************************** 115 WRITING THE OUTPUT 116 ***************************************************************************/ 117 *pDataOut=(LVM_INT32)ynL; /* Write Left output in Q0*/ 118 pDataOut++; 119 *pDataOut=(LVM_INT32)ynR; /* Write Right ouput in Q0*/ 120 pDataOut++; 121 122 123 } 124 125 } 126 127
