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 #ifdef BUILD_FLOAT 40 void BQ_2I_D32F32C30_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance, 41 LVM_FLOAT *pDataIn, 42 LVM_FLOAT *pDataOut, 43 LVM_INT16 NrSamples) 44 45 46 { 47 LVM_FLOAT ynL,ynR,templ,tempd; 48 LVM_INT16 ii; 49 PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance; 50 51 for (ii = NrSamples; ii != 0; ii--) 52 { 53 54 55 /************************************************************************** 56 PROCESSING OF THE LEFT CHANNEL 57 ***************************************************************************/ 58 /* ynL= ( A2 * x(n-2)L ) */ 59 ynL = pBiquadState->coefs[0] * pBiquadState->pDelays[2]; 60 61 /* ynL+= ( A1 * x(n-1)L )*/ 62 templ = pBiquadState->coefs[1] * pBiquadState->pDelays[0]; 63 ynL += templ; 64 65 /* ynL+= ( A0 * x(n)L ) */ 66 templ = pBiquadState->coefs[2] * (*pDataIn); 67 ynL += templ; 68 69 /* ynL+= (-B2 * y(n-2)L ) */ 70 templ = pBiquadState->coefs[3] * pBiquadState->pDelays[6]; 71 ynL += templ; 72 73 /* ynL+= (-B1 * y(n-1)L )*/ 74 templ = pBiquadState->coefs[4] * pBiquadState->pDelays[4]; 75 ynL += templ; 76 77 /************************************************************************** 78 PROCESSING OF THE RIGHT CHANNEL 79 ***************************************************************************/ 80 /* ynR= ( A2 * x(n-2)R ) */ 81 ynR = pBiquadState->coefs[0] * pBiquadState->pDelays[3]; 82 83 /* ynR+= ( A1 * x(n-1)R ) */ 84 templ = pBiquadState->coefs[1] * pBiquadState->pDelays[1]; 85 ynR += templ; 86 87 /* ynR+= ( A0 * x(n)R ) */ 88 tempd =* (pDataIn+1); 89 templ = pBiquadState->coefs[2] * tempd; 90 ynR += templ; 91 92 /* ynR+= (-B2 * y(n-2)R ) */ 93 templ = pBiquadState->coefs[3] * pBiquadState->pDelays[7]; 94 ynR += templ; 95 96 /* ynR+= (-B1 * y(n-1)R ) */ 97 templ = pBiquadState->coefs[4] * pBiquadState->pDelays[5]; 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_FLOAT)ynR; /* Update y(n-1)R */ 108 pBiquadState->pDelays[4] = (LVM_FLOAT)ynL; /* Update y(n-1)L */ 109 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L */ 110 pDataIn++; 111 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R */ 112 pDataIn++; 113 114 /************************************************************************** 115 WRITING THE OUTPUT 116 ***************************************************************************/ 117 *pDataOut = (LVM_FLOAT)ynL; /* Write Left output */ 118 pDataOut++; 119 *pDataOut = (LVM_FLOAT)ynR; /* Write Right ouput */ 120 pDataOut++; 121 122 123 } 124 125 } 126 #else 127 void BQ_2I_D32F32C30_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 128 LVM_INT32 *pDataIn, 129 LVM_INT32 *pDataOut, 130 LVM_INT16 NrSamples) 131 132 133 { 134 LVM_INT32 ynL,ynR,templ,tempd; 135 LVM_INT16 ii; 136 PFilter_State pBiquadState = (PFilter_State) pInstance; 137 138 for (ii = NrSamples; ii != 0; ii--) 139 { 140 141 142 /************************************************************************** 143 PROCESSING OF THE LEFT CHANNEL 144 ***************************************************************************/ 145 /* ynL= ( A2 (Q30) * x(n-2)L (Q0) ) >>30 in Q0*/ 146 MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[2],ynL,30) 147 148 /* ynL+= ( A1 (Q30) * x(n-1)L (Q0) ) >> 30 in Q0*/ 149 MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[0],templ,30) 150 ynL+=templ; 151 152 /* ynL+= ( A0 (Q30) * x(n)L (Q0) ) >> 30 in Q0*/ 153 MUL32x32INTO32(pBiquadState->coefs[2],*pDataIn,templ,30) 154 ynL+=templ; 155 156 /* ynL+= (-B2 (Q30) * y(n-2)L (Q0) ) >> 30 in Q0*/ 157 MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[6],templ,30) 158 ynL+=templ; 159 160 /* ynL+= (-B1 (Q30) * y(n-1)L (Q0) ) >> 30 in Q0 */ 161 MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[4],templ,30) 162 ynL+=templ; 163 164 /************************************************************************** 165 PROCESSING OF THE RIGHT CHANNEL 166 ***************************************************************************/ 167 /* ynR= ( A2 (Q30) * x(n-2)R (Q0) ) >> 30 in Q0*/ 168 MUL32x32INTO32(pBiquadState->coefs[0],pBiquadState->pDelays[3],ynR,30) 169 170 /* ynR+= ( A1 (Q30) * x(n-1)R (Q0) ) >> 30 in Q0*/ 171 MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[1],templ,30) 172 ynR+=templ; 173 174 /* ynR+= ( A0 (Q30) * x(n)R (Q0) ) >> 30 in Q0*/ 175 tempd=*(pDataIn+1); 176 MUL32x32INTO32(pBiquadState->coefs[2],tempd,templ,30) 177 ynR+=templ; 178 179 /* ynR+= (-B2 (Q30) * y(n-2)R (Q0) ) >> 30 in Q0*/ 180 MUL32x32INTO32(pBiquadState->coefs[3],pBiquadState->pDelays[7],templ,30) 181 ynR+=templ; 182 183 /* ynR+= (-B1 (Q30) * y(n-1)R (Q0) ) >> 30 in Q0 */ 184 MUL32x32INTO32(pBiquadState->coefs[4],pBiquadState->pDelays[5],templ,30) 185 ynR+=templ; 186 187 /************************************************************************** 188 UPDATING THE DELAYS 189 ***************************************************************************/ 190 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 191 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 192 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 193 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 194 pBiquadState->pDelays[5]=(LVM_INT32)ynR; /* Update y(n-1)R in Q0*/ 195 pBiquadState->pDelays[4]=(LVM_INT32)ynL; /* Update y(n-1)L in Q0*/ 196 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 197 pDataIn++; 198 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 199 pDataIn++; 200 201 /************************************************************************** 202 WRITING THE OUTPUT 203 ***************************************************************************/ 204 *pDataOut=(LVM_INT32)ynL; /* Write Left output in Q0*/ 205 pDataOut++; 206 *pDataOut=(LVM_INT32)ynR; /* Write Right ouput in Q0*/ 207 pDataOut++; 208 209 210 } 211 212 } 213 #endif /*BUILD_FLOAT*/ 214
