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 /************************************************************************** 24 ASSUMPTIONS: 25 COEFS- 26 pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1 27 pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2 28 pBiquadState->coefs[4] is -B1, these are in Q13 format 29 30 DELAYS- 31 pBiquadState->pDelays[0] is x(n-1)L in Q0 format 32 pBiquadState->pDelays[1] is x(n-1)R in Q0 format 33 pBiquadState->pDelays[2] is x(n-2)L in Q0 format 34 pBiquadState->pDelays[3] is x(n-2)R in Q0 format 35 pBiquadState->pDelays[4] is y(n-1)L in Q16 format 36 pBiquadState->pDelays[5] is y(n-1)R in Q16 format 37 pBiquadState->pDelays[6] is y(n-2)L in Q16 format 38 pBiquadState->pDelays[7] is y(n-2)R in Q16 format 39 ***************************************************************************/ 40 #ifdef BUILD_FLOAT 41 void BQ_2I_D16F32C13_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance, 42 LVM_FLOAT *pDataIn, 43 LVM_FLOAT *pDataOut, 44 LVM_INT16 NrSamples) 45 { 46 LVM_FLOAT ynL,ynR; 47 LVM_INT16 ii; 48 PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance; 49 50 for (ii = NrSamples; ii != 0; ii--) 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 /* ynL+=-B1*y(n-1)L */ 69 ynL += pBiquadState->pDelays[4] * pBiquadState->coefs[4]; 70 71 /************************************************************************** 72 PROCESSING OF THE RIGHT CHANNEL 73 ***************************************************************************/ 74 /* ynR=A2 * x(n-2)R */ 75 ynR = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[3]; 76 77 /* ynR+=A1* x(n-1)R */ 78 ynR += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[1]; 79 80 /* ynR+=A0* x(n)R */ 81 ynR += (LVM_FLOAT)pBiquadState->coefs[2] * (*(pDataIn+1)); 82 83 /* ynR+=-B2 * y(n-2)R */ 84 ynR += pBiquadState->pDelays[7] * pBiquadState->coefs[3]; 85 86 /* ynR+=-B1 * y(n-1)R */ 87 ynR += pBiquadState->pDelays[5] * pBiquadState->coefs[4]; 88 89 /************************************************************************** 90 UPDATING THE DELAYS 91 ***************************************************************************/ 92 pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 93 pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 94 pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 95 pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 96 pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R */ 97 pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L */ 98 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L */ 99 pDataIn++; 100 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R */ 101 pDataIn++; 102 103 /************************************************************************** 104 WRITING THE OUTPUT 105 ***************************************************************************/ 106 *pDataOut = (LVM_FLOAT)(ynL); /* Write Left output */ 107 pDataOut++; 108 *pDataOut = (LVM_FLOAT)(ynR); /* Write Right ouput */ 109 pDataOut++; 110 } 111 } 112 #else 113 void BQ_2I_D16F32C13_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 114 LVM_INT16 *pDataIn, 115 LVM_INT16 *pDataOut, 116 LVM_INT16 NrSamples) 117 { 118 LVM_INT32 ynL,ynR,templ; 119 LVM_INT16 ii; 120 PFilter_State pBiquadState = (PFilter_State) pInstance; 121 122 for (ii = NrSamples; ii != 0; ii--) 123 { 124 125 126 /************************************************************************** 127 PROCESSING OF THE LEFT CHANNEL 128 ***************************************************************************/ 129 /* ynL=A2 (Q13) * x(n-2)L (Q0) in Q13*/ 130 ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2]; 131 132 /* ynL+=A1 (Q13) * x(n-1)L (Q0) in Q13*/ 133 ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0]; 134 135 /* ynL+=A0 (Q13) * x(n)L (Q0) in Q13*/ 136 ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn); 137 138 /* ynL+= ( (-B2 (Q13) * y(n-2)L (Q16) )>>16) in Q13 */ 139 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16) 140 ynL+=templ; 141 142 /* ynL+=( (-B1 (Q13) * y(n-1)L (Q16) )>>16) in Q13 */ 143 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16) 144 ynL+=templ; 145 146 /************************************************************************** 147 PROCESSING OF THE RIGHT CHANNEL 148 ***************************************************************************/ 149 /* ynR=A2 (Q13) * x(n-2)R (Q0) in Q13*/ 150 ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3]; 151 152 /* ynR+=A1 (Q13) * x(n-1)R (Q0) in Q13*/ 153 ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1]; 154 155 /* ynR+=A0 (Q13) * x(n)R (Q0) in Q13*/ 156 ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1)); 157 158 /* ynR+= ( (-B2 (Q13) * y(n-2)R (Q16) )>>16) in Q13*/ 159 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16) 160 ynR+=templ; 161 162 /* ynR+=( (-B1 (Q13) * y(n-1)R (Q16) )>>16) in Q13 */ 163 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16) 164 ynR+=templ; 165 166 /************************************************************************** 167 UPDATING THE DELAYS 168 ***************************************************************************/ 169 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 170 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 171 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 172 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 173 pBiquadState->pDelays[5]=ynR<<3; /* Update y(n-1)R in Q16*/ 174 pBiquadState->pDelays[4]=ynL<<3; /* Update y(n-1)L in Q16*/ 175 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 176 pDataIn++; 177 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 178 pDataIn++; 179 180 /************************************************************************** 181 WRITING THE OUTPUT 182 ***************************************************************************/ 183 *pDataOut=(LVM_INT16)(ynL>>13); /* Write Left output in Q0*/ 184 pDataOut++; 185 *pDataOut=(LVM_INT16)(ynR>>13); /* Write Right ouput in Q0*/ 186 pDataOut++; 187 } 188 189 } 190 #endif 191
