| /* |
| * 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 "BQ_2I_D16F32Css_TRC_WRA_01_Private.h" |
| #include "LVM_Macros.h" |
| |
| /************************************************************************** |
| ASSUMPTIONS: |
| COEFS- |
| pBiquadState->coefs[0] is A2, pBiquadState->coefs[1] is A1 |
| pBiquadState->coefs[2] is A0, pBiquadState->coefs[3] is -B2 |
| pBiquadState->coefs[4] is -B1, these are in Q14 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 Q16 format |
| pBiquadState->pDelays[5] is y(n-1)R in Q16 format |
| pBiquadState->pDelays[6] is y(n-2)L in Q16 format |
| pBiquadState->pDelays[7] is y(n-2)R in Q16 format |
| ***************************************************************************/ |
| #ifdef BUILD_FLOAT |
| void BQ_2I_D16F32C14_TRC_WRA_01 ( Biquad_FLOAT_Instance_t *pInstance, |
| LVM_FLOAT *pDataIn, |
| LVM_FLOAT *pDataOut, |
| LVM_INT16 NrSamples) |
| { |
| LVM_FLOAT ynL,ynR; |
| LVM_INT16 ii; |
| PFilter_State_FLOAT pBiquadState = (PFilter_State_FLOAT) pInstance; |
| |
| for (ii = NrSamples; ii != 0; ii--) |
| { |
| |
| |
| /************************************************************************** |
| PROCESSING OF THE LEFT CHANNEL |
| ***************************************************************************/ |
| /* ynL=A2 * x(n-2)L */ |
| ynL = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[2]; |
| |
| /* ynL+=A1 * x(n-1)L */ |
| ynL += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[0]; |
| |
| /* ynL+=A0 * x(n)L */ |
| ynL += (LVM_FLOAT)pBiquadState->coefs[2] * (*pDataIn); |
| |
| /* ynL+= ( (-B2 * y(n-2)L ))*/ |
| ynL += pBiquadState->pDelays[6] * pBiquadState->coefs[3]; |
| |
| |
| /* ynL+=( (-B1 * y(n-1)L )) */ |
| ynL += pBiquadState->pDelays[4] * pBiquadState->coefs[4]; |
| |
| /************************************************************************** |
| PROCESSING OF THE RIGHT CHANNEL |
| ***************************************************************************/ |
| /* ynR=A2 * x(n-2)R */ |
| ynR = (LVM_FLOAT)pBiquadState->coefs[0] * pBiquadState->pDelays[3]; |
| |
| /* ynR+=A1 * x(n-1)R */ |
| ynR += (LVM_FLOAT)pBiquadState->coefs[1] * pBiquadState->pDelays[1]; |
| |
| /* ynR+=A0 * x(n)R */ |
| ynR += (LVM_FLOAT)pBiquadState->coefs[2] * (*(pDataIn+1)); |
| |
| /* ynR+= ( (-B2 * y(n-2)R ))*/ |
| ynR += pBiquadState->pDelays[7] * pBiquadState->coefs[3]; |
| |
| /* ynR+=( (-B1 * y(n-1)R )) */ |
| ynR += pBiquadState->pDelays[5] * pBiquadState->coefs[4]; |
| |
| /************************************************************************** |
| 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 = (LVM_FLOAT)(ynL); /* Write Left output */ |
| pDataOut++; |
| *pDataOut = (LVM_FLOAT)(ynR); /* Write Right ouput */ |
| pDataOut++; |
| } |
| |
| } |
| #else |
| void BQ_2I_D16F32C14_TRC_WRA_01 ( Biquad_Instance_t *pInstance, |
| LVM_INT16 *pDataIn, |
| LVM_INT16 *pDataOut, |
| LVM_INT16 NrSamples) |
| { |
| LVM_INT32 ynL,ynR,templ; |
| LVM_INT16 ii; |
| PFilter_State pBiquadState = (PFilter_State) pInstance; |
| |
| for (ii = NrSamples; ii != 0; ii--) |
| { |
| |
| |
| /************************************************************************** |
| PROCESSING OF THE LEFT CHANNEL |
| ***************************************************************************/ |
| /* ynL=A2 (Q14) * x(n-2)L (Q0) in Q14*/ |
| ynL=(LVM_INT32)pBiquadState->coefs[0]* pBiquadState->pDelays[2]; |
| |
| /* ynL+=A1 (Q14) * x(n-1)L (Q0) in Q14*/ |
| ynL+=(LVM_INT32)pBiquadState->coefs[1]* pBiquadState->pDelays[0]; |
| |
| /* ynL+=A0 (Q14) * x(n)L (Q0) in Q14*/ |
| ynL+=(LVM_INT32)pBiquadState->coefs[2]* (*pDataIn); |
| |
| /* ynL+= ( (-B2 (Q14) * y(n-2)L (Q16) )>>16) in Q14 */ |
| MUL32x16INTO32(pBiquadState->pDelays[6],pBiquadState->coefs[3],templ,16) |
| ynL+=templ; |
| |
| /* ynL+=( (-B1 (Q14) * y(n-1)L (Q16) )>>16) in Q14 */ |
| MUL32x16INTO32(pBiquadState->pDelays[4],pBiquadState->coefs[4],templ,16) |
| ynL+=templ; |
| |
| /************************************************************************** |
| PROCESSING OF THE RIGHT CHANNEL |
| ***************************************************************************/ |
| /* ynR=A2 (Q14) * x(n-2)R (Q0) in Q14*/ |
| ynR=(LVM_INT32)pBiquadState->coefs[0]*pBiquadState->pDelays[3]; |
| |
| /* ynR+=A1 (Q14) * x(n-1)R (Q0) in Q14*/ |
| ynR+=(LVM_INT32)pBiquadState->coefs[1]*pBiquadState->pDelays[1]; |
| |
| /* ynR+=A0 (Q14) * x(n)R (Q0) in Q14*/ |
| ynR+=(LVM_INT32)pBiquadState->coefs[2]*(*(pDataIn+1)); |
| |
| /* ynR+= ( (-B2 (Q14) * y(n-2)R (Q16) )>>16) in Q14*/ |
| MUL32x16INTO32(pBiquadState->pDelays[7],pBiquadState->coefs[3],templ,16) |
| ynR+=templ; |
| |
| /* ynR+=( (-B1 (Q14) * y(n-1)R (Q16) )>>16) in Q14 */ |
| MUL32x16INTO32(pBiquadState->pDelays[5],pBiquadState->coefs[4],templ,16) |
| ynR+=templ; |
| |
| /************************************************************************** |
| 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<<2; /* Update y(n-1)R in Q16*/ |
| pBiquadState->pDelays[4]=ynL<<2; /* Update y(n-1)L in Q16*/ |
| 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=(LVM_INT16)(ynL>>14); /* Write Left output in Q0*/ |
| pDataOut++; |
| *pDataOut=(LVM_INT16)(ynR>>14); /* Write Right ouput in Q0*/ |
| pDataOut++; |
| } |
| |
| } |
| #endif |