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 void PK_2I_D32F32C14G11_TRC_WRA_01 ( Biquad_Instance_t *pInstance, 42 LVM_INT32 *pDataIn, 43 LVM_INT32 *pDataOut, 44 LVM_INT16 NrSamples) 45 { 46 LVM_INT32 ynL,ynR,ynLO,ynRO,templ; 47 LVM_INT16 ii; 48 PFilter_State pBiquadState = (PFilter_State) pInstance; 49 50 for (ii = NrSamples; ii != 0; ii--) 51 { 52 53 54 /************************************************************************** 55 PROCESSING OF THE LEFT CHANNEL 56 ***************************************************************************/ 57 /* ynL= (A0 (Q14) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>14) in Q0*/ 58 templ=(*pDataIn)-pBiquadState->pDelays[2]; 59 MUL32x16INTO32(templ,pBiquadState->coefs[0],ynL,14) 60 61 /* ynL+= ((-B2 (Q14) * y(n-2)L (Q0) ) >>14) in Q0*/ 62 MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[1],templ,14) 63 ynL+=templ; 64 65 /* ynL+= ((-B1 (Q14) * y(n-1)L (Q0) ) >>14) in Q0 */ 66 MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[2],templ,14) 67 ynL+=templ; 68 69 /* ynLO= ((Gain (Q11) * ynL (Q0))>>11) in Q0*/ 70 MUL32x16INTO32(ynL,pBiquadState->coefs[3],ynLO,11) 71 72 /* ynLO=( ynLO(Q0) + x(n)L (Q0) ) in Q0*/ 73 ynLO+= (*pDataIn); 74 75 /************************************************************************** 76 PROCESSING OF THE RIGHT CHANNEL 77 ***************************************************************************/ 78 /* ynR= (A0 (Q14) * (x(n)R (Q0) - x(n-2)R (Q0) ) >>14) in Q0*/ 79 templ=(*(pDataIn+1))-pBiquadState->pDelays[3]; 80 MUL32x16INTO32(templ,pBiquadState->coefs[0],ynR,14) 81 82 /* ynR+= ((-B2 (Q14) * y(n-2)R (Q0) ) >>14) in Q0*/ 83 MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[1],templ,14) 84 ynR+=templ; 85 86 /* ynR+= ((-B1 (Q14) * y(n-1)R (Q0) ) >>14) in Q0 */ 87 MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[2],templ,14) 88 ynR+=templ; 89 90 /* ynRO= ((Gain (Q11) * ynR (Q0))>>11) in Q0*/ 91 MUL32x16INTO32(ynR,pBiquadState->coefs[3],ynRO,11) 92 93 /* ynRO=( ynRO(Q0) + x(n)R (Q0) ) in Q0*/ 94 ynRO+= (*(pDataIn+1)); 95 96 /************************************************************************** 97 UPDATING THE DELAYS 98 ***************************************************************************/ 99 pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ 100 pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ 101 pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ 102 pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ 103 pBiquadState->pDelays[5]=ynR; /* Update y(n-1)R in Q0*/ 104 pBiquadState->pDelays[4]=ynL; /* Update y(n-1)L in Q0*/ 105 pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ 106 pDataIn++; 107 pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ 108 pDataIn++; 109 110 /************************************************************************** 111 WRITING THE OUTPUT 112 ***************************************************************************/ 113 *pDataOut=ynLO; /* Write Left output in Q0*/ 114 pDataOut++; 115 *pDataOut=ynRO; /* Write Right ouput in Q0*/ 116 pDataOut++; 117 118 } 119 120 } 121 122
