| /* |
| * Copyright (C) 2004-2010 NXP Software |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "BIQUAD.h" |
| #include "PK_2I_D32F32CssGss_TRC_WRA_01_Private.h" |
| #include "LVM_Macros.h" |
| |
| /************************************************************************** |
| ASSUMPTIONS: |
| COEFS- |
| pBiquadState->coefs[0] is A0, |
| pBiquadState->coefs[1] is -B2, |
| pBiquadState->coefs[2] is -B1, these are in Q14 format |
| pBiquadState->coefs[3] is Gain, in Q11 format |
| |
| |
| DELAYS- |
| pBiquadState->pDelays[0] is x(n-1)L in Q0 format |
| pBiquadState->pDelays[1] is x(n-1)R in Q0 format |
| pBiquadState->pDelays[2] is x(n-2)L in Q0 format |
| pBiquadState->pDelays[3] is x(n-2)R in Q0 format |
| pBiquadState->pDelays[4] is y(n-1)L in Q0 format |
| pBiquadState->pDelays[5] is y(n-1)R in Q0 format |
| pBiquadState->pDelays[6] is y(n-2)L in Q0 format |
| pBiquadState->pDelays[7] is y(n-2)R in Q0 format |
| ***************************************************************************/ |
| #ifdef BUILD_FLOAT |
| void PK_2I_D32F32C14G11_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance, |
| LVM_FLOAT *pDataIn, |
| LVM_FLOAT *pDataOut, |
| LVM_INT16 NrSamples) |
| { |
| LVM_FLOAT ynL,ynR,ynLO,ynRO,templ; |
| LVM_INT16 ii; |
| PFilter_State_Float pBiquadState = (PFilter_State_Float) pInstance; |
| |
| for (ii = NrSamples; ii != 0; ii--) |
| { |
| |
| |
| /************************************************************************** |
| PROCESSING OF THE LEFT CHANNEL |
| ***************************************************************************/ |
| /* ynL= (A0 * (x(n)L - x(n-2)L ) )*/ |
| templ = (*pDataIn) - pBiquadState->pDelays[2]; |
| ynL = templ * pBiquadState->coefs[0]; |
| |
| /* ynL+= ((-B2 * y(n-2)L )) */ |
| templ = pBiquadState->pDelays[6] * pBiquadState->coefs[1]; |
| ynL += templ; |
| |
| /* ynL+= ((-B1 * y(n-1)L ) ) */ |
| templ = pBiquadState->pDelays[4] * pBiquadState->coefs[2]; |
| ynL += templ; |
| |
| /* ynLO= ((Gain * ynL )) */ |
| ynLO = ynL * pBiquadState->coefs[3]; |
| |
| /* ynLO=( ynLO + x(n)L )*/ |
| ynLO += (*pDataIn); |
| |
| /************************************************************************** |
| PROCESSING OF THE RIGHT CHANNEL |
| ***************************************************************************/ |
| /* ynR= (A0 * (x(n)R - x(n-2)R ) ) */ |
| templ = (*(pDataIn + 1)) - pBiquadState->pDelays[3]; |
| ynR = templ * pBiquadState->coefs[0]; |
| |
| /* ynR+= ((-B2 * y(n-2)R ) ) */ |
| templ = pBiquadState->pDelays[7] * pBiquadState->coefs[1]; |
| ynR += templ; |
| |
| /* ynR+= ((-B1 * y(n-1)R ) ) */ |
| templ = pBiquadState->pDelays[5] * pBiquadState->coefs[2]; |
| ynR += templ; |
| |
| /* ynRO= ((Gain * ynR )) */ |
| ynRO = ynR * pBiquadState->coefs[3]; |
| |
| /* ynRO=( ynRO + x(n)R )*/ |
| ynRO += (*(pDataIn+1)); |
| |
| /************************************************************************** |
| UPDATING THE DELAYS |
| ***************************************************************************/ |
| pBiquadState->pDelays[7] = pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ |
| pBiquadState->pDelays[6] = pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ |
| pBiquadState->pDelays[3] = pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ |
| pBiquadState->pDelays[2] = pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ |
| pBiquadState->pDelays[5] = ynR; /* Update y(n-1)R */ |
| pBiquadState->pDelays[4] = ynL; /* Update y(n-1)L */ |
| pBiquadState->pDelays[0] = (*pDataIn); /* Update x(n-1)L */ |
| pDataIn++; |
| pBiquadState->pDelays[1] = (*pDataIn); /* Update x(n-1)R */ |
| pDataIn++; |
| |
| /************************************************************************** |
| WRITING THE OUTPUT |
| ***************************************************************************/ |
| *pDataOut = ynLO; /* Write Left output*/ |
| pDataOut++; |
| *pDataOut = ynRO; /* Write Right ouput*/ |
| pDataOut++; |
| |
| } |
| |
| } |
| #else |
| void PK_2I_D32F32C14G11_TRC_WRA_01 ( Biquad_Instance_t *pInstance, |
| LVM_INT32 *pDataIn, |
| LVM_INT32 *pDataOut, |
| LVM_INT16 NrSamples) |
| { |
| LVM_INT32 ynL,ynR,ynLO,ynRO,templ; |
| LVM_INT16 ii; |
| PFilter_State pBiquadState = (PFilter_State) pInstance; |
| |
| for (ii = NrSamples; ii != 0; ii--) |
| { |
| |
| |
| /************************************************************************** |
| PROCESSING OF THE LEFT CHANNEL |
| ***************************************************************************/ |
| /* ynL= (A0 (Q14) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>14) in Q0*/ |
| templ=(*pDataIn)-pBiquadState->pDelays[2]; |
| MUL32x16INTO32(templ,pBiquadState->coefs[0],ynL,14) |
| |
| /* ynL+= ((-B2 (Q14) * y(n-2)L (Q0) ) >>14) in Q0*/ |
| MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[1],templ,14) |
| ynL+=templ; |
| |
| /* ynL+= ((-B1 (Q14) * y(n-1)L (Q0) ) >>14) in Q0 */ |
| MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[2],templ,14) |
| ynL+=templ; |
| |
| /* ynLO= ((Gain (Q11) * ynL (Q0))>>11) in Q0*/ |
| MUL32x16INTO32(ynL,pBiquadState->coefs[3],ynLO,11) |
| |
| /* ynLO=( ynLO(Q0) + x(n)L (Q0) ) in Q0*/ |
| ynLO+= (*pDataIn); |
| |
| /************************************************************************** |
| PROCESSING OF THE RIGHT CHANNEL |
| ***************************************************************************/ |
| /* ynR= (A0 (Q14) * (x(n)R (Q0) - x(n-2)R (Q0) ) >>14) in Q0*/ |
| templ=(*(pDataIn+1))-pBiquadState->pDelays[3]; |
| MUL32x16INTO32(templ,pBiquadState->coefs[0],ynR,14) |
| |
| /* ynR+= ((-B2 (Q14) * y(n-2)R (Q0) ) >>14) in Q0*/ |
| MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[1],templ,14) |
| ynR+=templ; |
| |
| /* ynR+= ((-B1 (Q14) * y(n-1)R (Q0) ) >>14) in Q0 */ |
| MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[2],templ,14) |
| ynR+=templ; |
| |
| /* ynRO= ((Gain (Q11) * ynR (Q0))>>11) in Q0*/ |
| MUL32x16INTO32(ynR,pBiquadState->coefs[3],ynRO,11) |
| |
| /* ynRO=( ynRO(Q0) + x(n)R (Q0) ) in Q0*/ |
| ynRO+= (*(pDataIn+1)); |
| |
| /************************************************************************** |
| UPDATING THE DELAYS |
| ***************************************************************************/ |
| pBiquadState->pDelays[7]=pBiquadState->pDelays[5]; /* y(n-2)R=y(n-1)R*/ |
| pBiquadState->pDelays[6]=pBiquadState->pDelays[4]; /* y(n-2)L=y(n-1)L*/ |
| pBiquadState->pDelays[3]=pBiquadState->pDelays[1]; /* x(n-2)R=x(n-1)R*/ |
| pBiquadState->pDelays[2]=pBiquadState->pDelays[0]; /* x(n-2)L=x(n-1)L*/ |
| pBiquadState->pDelays[5]=ynR; /* Update y(n-1)R in Q0*/ |
| pBiquadState->pDelays[4]=ynL; /* Update y(n-1)L in Q0*/ |
| pBiquadState->pDelays[0]=(*pDataIn); /* Update x(n-1)L in Q0*/ |
| pDataIn++; |
| pBiquadState->pDelays[1]=(*pDataIn); /* Update x(n-1)R in Q0*/ |
| pDataIn++; |
| |
| /************************************************************************** |
| WRITING THE OUTPUT |
| ***************************************************************************/ |
| *pDataOut=ynLO; /* Write Left output in Q0*/ |
| pDataOut++; |
| *pDataOut=ynRO; /* Write Right ouput in Q0*/ |
| pDataOut++; |
| |
| } |
| |
| } |
| #endif |