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 "PK_2I_D32F32CssGss_TRC_WRA_01_Private.h" 20 #include "LVM_Macros.h" 21 22 /************************************************************************** 23 ASSUMPTIONS: 24 COEFS- 25 pBiquadState->coefs[0] is A0, 26 pBiquadState->coefs[1] is -B2, 27 pBiquadState->coefs[2] is -B1, these are in Q14 format 28 pBiquadState->coefs[3] is Gain, in Q11 format 29 30 31 DELAYS- 32 pBiquadState->pDelays[0] is x(n-1)L in Q0 format 33 pBiquadState->pDelays[1] is x(n-1)R in Q0 format 34 pBiquadState->pDelays[2] is x(n-2)L in Q0 format 35 pBiquadState->pDelays[3] is x(n-2)R in Q0 format 36 pBiquadState->pDelays[4] is y(n-1)L in Q0 format 37 pBiquadState->pDelays[5] is y(n-1)R in Q0 format 38 pBiquadState->pDelays[6] is y(n-2)L in Q0 format 39 pBiquadState->pDelays[7] is y(n-2)R in Q0 format 40 ***************************************************************************/ 41 #ifdef BUILD_FLOAT 42 void PK_2I_D32F32C14G11_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance, 43 LVM_FLOAT *pDataIn, 44 LVM_FLOAT *pDataOut, 45 LVM_INT16 NrSamples) 46 { 47 LVM_FLOAT ynL,ynR,ynLO,ynRO,templ; 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= (A0 * (x(n)L - x(n-2)L ) )*/ 59 templ = (*pDataIn) - pBiquadState->pDelays[2]; 60 ynL = templ * pBiquadState->coefs[0]; 61 62 /* ynL+= ((-B2 * y(n-2)L )) */ 63 templ = pBiquadState->pDelays[6] * pBiquadState->coefs[1]; 64 ynL += templ; 65 66 /* ynL+= ((-B1 * y(n-1)L ) ) */ 67 templ = pBiquadState->pDelays[4] * pBiquadState->coefs[2]; 68 ynL += templ; 69 70 /* ynLO= ((Gain * ynL )) */ 71 ynLO = ynL * pBiquadState->coefs[3]; 72 73 /* ynLO=( ynLO + x(n)L )*/ 74 ynLO += (*pDataIn); 75 76 /************************************************************************** 77 PROCESSING OF THE RIGHT CHANNEL 78 ***************************************************************************/ 79 /* ynR= (A0 * (x(n)R - x(n-2)R ) ) */ 80 templ = (*(pDataIn + 1)) - pBiquadState->pDelays[3]; 81 ynR = templ * pBiquadState->coefs[0]; 82 83 /* ynR+= ((-B2 * y(n-2)R ) ) */ 84 templ = pBiquadState->pDelays[7] * pBiquadState->coefs[1]; 85 ynR += templ; 86 87 /* ynR+= ((-B1 * y(n-1)R ) ) */ 88 templ = pBiquadState->pDelays[5] * pBiquadState->coefs[2]; 89 ynR += templ; 90 91 /* ynRO= ((Gain * ynR )) */ 92 ynRO = ynR * pBiquadState->coefs[3]; 93 94 /* ynRO=( ynRO + x(n)R )*/ 95 ynRO += (*(pDataIn+1)); 96 97 /************************************************************************** 98 UPDATING THE DELAYS 99 ***************************************************************************/ 100 pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 101 pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 102 pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 103 pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 104 pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R */ 105 pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L */ 106 pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L */ 107 pDataIn++; 108 pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R */ 109 pDataIn++; 110 111 /************************************************************************** 112 WRITING THE OUTPUT 113 ***************************************************************************/ 114 *pDataOut = ynLO; /* Write Left output*/ 115 pDataOut++; 116 *pDataOut = ynRO; /* Write Right ouput*/ 117 pDataOut++; 118 119 } 120 121 } 122 #else 123 void PK_2I_D32F32C14G11_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 124 LVM_INT32 *pDataIn, 125 LVM_INT32 *pDataOut, 126 LVM_INT16 NrSamples) 127 { 128 LVM_INT32 ynL,ynR,ynLO,ynRO,templ; 129 LVM_INT16 ii; 130 PFilter_State pBiquadState = (PFilter_State) pInstance; 131 132 for (ii = NrSamples; ii != 0; ii--) 133 { 134 135 136 /************************************************************************** 137 PROCESSING OF THE LEFT CHANNEL 138 ***************************************************************************/ 139 /* ynL= (A0 (Q14) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>14) in Q0*/ 140 templ=(*pDataIn)-pBiquadState->pDelays[2]; 141 MUL32x16INTO32(templ,pBiquadState->coefs[0],ynL,14) 142 143 /* ynL+= ((-B2 (Q14) * y(n-2)L (Q0) ) >>14) in Q0*/ 144 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[1],templ,14) 145 ynL+=templ; 146 147 /* ynL+= ((-B1 (Q14) * y(n-1)L (Q0) ) >>14) in Q0 */ 148 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[2],templ,14) 149 ynL+=templ; 150 151 /* ynLO= ((Gain (Q11) * ynL (Q0))>>11) in Q0*/ 152 MUL32x16INTO32(ynL,pBiquadState->coefs[3],ynLO,11) 153 154 /* ynLO=( ynLO(Q0) + x(n)L (Q0) ) in Q0*/ 155 ynLO+= (*pDataIn); 156 157 /************************************************************************** 158 PROCESSING OF THE RIGHT CHANNEL 159 ***************************************************************************/ 160 /* ynR= (A0 (Q14) * (x(n)R (Q0) - x(n-2)R (Q0) ) >>14) in Q0*/ 161 templ=(*(pDataIn+1))-pBiquadState->pDelays[3]; 162 MUL32x16INTO32(templ,pBiquadState->coefs[0],ynR,14) 163 164 /* ynR+= ((-B2 (Q14) * y(n-2)R (Q0) ) >>14) in Q0*/ 165 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[1],templ,14) 166 ynR+=templ; 167 168 /* ynR+= ((-B1 (Q14) * y(n-1)R (Q0) ) >>14) in Q0 */ 169 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[2],templ,14) 170 ynR+=templ; 171 172 /* ynRO= ((Gain (Q11) * ynR (Q0))>>11) in Q0*/ 173 MUL32x16INTO32(ynR,pBiquadState->coefs[3],ynRO,11) 174 175 /* ynRO=( ynRO(Q0) + x(n)R (Q0) ) in Q0*/ 176 ynRO+= (*(pDataIn+1)); 177 178 /************************************************************************** 179 UPDATING THE DELAYS 180 ***************************************************************************/ 181 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 182 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 183 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 184 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 185 pBiquadState->pDelays[5]=ynR; /* Update y(n-1)R in Q0*/ 186 pBiquadState->pDelays[4]=ynL; /* Update y(n-1)L in Q0*/ 187 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 188 pDataIn++; 189 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 190 pDataIn++; 191 192 /************************************************************************** 193 WRITING THE OUTPUT 194 ***************************************************************************/ 195 *pDataOut=ynLO; /* Write Left output in Q0*/ 196 pDataOut++; 197 *pDataOut=ynRO; /* Write Right ouput in Q0*/ 198 pDataOut++; 199 200 } 201 202 } 203 #endif 204
