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_D16F32Css_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 Q15 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 Q16 format 35 pBiquadState->pDelays[5] is y(n-1)R in Q16 format 36 pBiquadState->pDelays[6] is y(n-2)L in Q16 format 37 pBiquadState->pDelays[7] is y(n-2)R in Q16 format 38 ***************************************************************************/ 39 #ifdef BUILD_FLOAT 40 void BQ_2I_D16F32C15_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance, 41 LVM_FLOAT *pDataIn, 42 LVM_FLOAT *pDataOut, 43 LVM_INT16 NrSamples) 44 { 45 LVM_FLOAT ynL,ynR; 46 LVM_INT16 ii; 47 PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance; 48 49 for (ii = NrSamples; ii != 0; ii--) 50 { 51 52 53 /************************************************************************** 54 PROCESSING OF THE LEFT CHANNEL 55 ***************************************************************************/ 56 /* ynL=A2 * x(n-2)L */ 57 ynL = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[2]; 58 59 /* ynL+=A1 * x(n-1)L */ 60 ynL += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[0]; 61 62 /* ynL+=A0 * x(n)L */ 63 ynL += (LVM_FLOAT)pBiquadState->coefs[2] * (*pDataIn); 64 65 /* ynL+= ( (-B2 * y(n-2)L ) */ 66 ynL += pBiquadState->pDelays[6] * pBiquadState->coefs[3]; 67 68 69 /* ynL+=( (-B1 * y(n-1)L )) */ 70 ynL += pBiquadState->pDelays[4] * pBiquadState->coefs[4]; 71 72 73 /************************************************************************** 74 PROCESSING OF THE RIGHT CHANNEL 75 ***************************************************************************/ 76 /* ynR=A2 * x(n-2)R */ 77 ynR = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[3]; 78 79 /* ynR+=A1 * x(n-1)R */ 80 ynR += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[1]; 81 82 /* ynR+=A0 * x(n)R */ 83 ynR += (LVM_FLOAT)pBiquadState->coefs[2] * (*(pDataIn+1)); 84 85 /* ynR+= ( (-B2 * y(n-2)R ) */ 86 ynR += pBiquadState->pDelays[7] * pBiquadState->coefs[3]; 87 88 89 /* ynR+=( (-B1 * y(n-1)R )) in Q15 */ 90 ynR += pBiquadState->pDelays[5] * pBiquadState->coefs[4]; 91 92 /************************************************************************** 93 UPDATING THE DELAYS 94 ***************************************************************************/ 95 pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 96 pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 97 pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 98 pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 99 pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R*/ 100 pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L*/ 101 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L*/ 102 pDataIn++; 103 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R*/ 104 pDataIn++; 105 106 /************************************************************************** 107 WRITING THE OUTPUT 108 ***************************************************************************/ 109 *pDataOut = (LVM_FLOAT)(ynL); /* Write Left output*/ 110 pDataOut++; 111 *pDataOut = (LVM_FLOAT)(ynR); /* Write Right ouput*/ 112 pDataOut++; 113 } 114 115 } 116 #else 117 void BQ_2I_D16F32C15_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 118 LVM_INT16 *pDataIn, 119 LVM_INT16 *pDataOut, 120 LVM_INT16 NrSamples) 121 { 122 LVM_INT32 ynL,ynR,templ; 123 LVM_INT16 ii; 124 PFilter_State pBiquadState = (PFilter_State) pInstance; 125 126 for (ii = NrSamples; ii != 0; ii--) 127 { 128 129 130 /************************************************************************** 131 PROCESSING OF THE LEFT CHANNEL 132 ***************************************************************************/ 133 /* ynL=A2 (Q15) * x(n-2)L (Q0) in Q15*/ 134 ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2]; 135 136 /* ynL+=A1 (Q15) * x(n-1)L (Q0) in Q15*/ 137 ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0]; 138 139 /* ynL+=A0 (Q15) * x(n)L (Q0) in Q15*/ 140 ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn); 141 142 /* ynL+= ( (-B2 (Q15) * y(n-2)L (Q16) )>>16) in Q15 */ 143 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16) 144 ynL+=templ; 145 146 /* ynL+=( (-B1 (Q15) * y(n-1)L (Q16) )>>16) in Q15 */ 147 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16) 148 ynL+=templ; 149 150 /************************************************************************** 151 PROCESSING OF THE RIGHT CHANNEL 152 ***************************************************************************/ 153 /* ynR=A2 (Q15) * x(n-2)R (Q0) in Q15*/ 154 ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3]; 155 156 /* ynR+=A1 (Q15) * x(n-1)R (Q0) in Q15*/ 157 ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1]; 158 159 /* ynR+=A0 (Q15) * x(n)R (Q0) in Q15*/ 160 ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1)); 161 162 /* ynR+= ( (-B2 (Q15) * y(n-2)R (Q16) )>>16) in Q15 */ 163 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16) 164 ynR+=templ; 165 166 /* ynR+=( (-B1 (Q15) * y(n-1)R (Q16) )>>16) in Q15 */ 167 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16) 168 ynR+=templ; 169 170 /************************************************************************** 171 UPDATING THE DELAYS 172 ***************************************************************************/ 173 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 174 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 175 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 176 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 177 pBiquadState->pDelays[5]=ynR<<1; /* Update y(n-1)R in Q16*/ 178 pBiquadState->pDelays[4]=ynL<<1; /* Update y(n-1)L in Q16*/ 179 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 180 pDataIn++; 181 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 182 pDataIn++; 183 184 /************************************************************************** 185 WRITING THE OUTPUT 186 ***************************************************************************/ 187 *pDataOut=(LVM_INT16)(ynL>>15); /* Write Left output in Q0*/ 188 pDataOut++; 189 *pDataOut=(LVM_INT16)(ynR>>15); /* Write Right ouput in Q0*/ 190 pDataOut++; 191 } 192 193 } 194 #endif 195
