diff options
Diffstat (limited to 'media/libeffects/lvm/lib/Common/src/BQ_2I_D16F16C14_TRC_WRA_01.c')
| -rwxr-xr-x | media/libeffects/lvm/lib/Common/src/BQ_2I_D16F16C14_TRC_WRA_01.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/media/libeffects/lvm/lib/Common/src/BQ_2I_D16F16C14_TRC_WRA_01.c b/media/libeffects/lvm/lib/Common/src/BQ_2I_D16F16C14_TRC_WRA_01.c new file mode 100755 index 0000000..c267a90 --- /dev/null +++ b/media/libeffects/lvm/lib/Common/src/BQ_2I_D16F16C14_TRC_WRA_01.c @@ -0,0 +1,123 @@ +/* + * 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. + */ + +/************************************************************************/ +/* */ +/* Project:: */ +/* $Author: beq07716 $*/ +/* $Revision: 1000 $*/ +/* $Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $*/ +/* */ +/************************************************************************/ + +#include "BIQUAD.h" +#include "BQ_2I_D16F16Css_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 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 +***************************************************************************/ + +void BQ_2I_D16F16C14_TRC_WRA_01 ( Biquad_Instance_t *pInstance, + LVM_INT16 *pDataIn, + LVM_INT16 *pDataOut, + LVM_INT16 NrSamples) + { + LVM_INT32 ynL,ynR; + 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 (Q0) ) in Q14 + ynL+=(LVM_INT32)pBiquadState->coefs[3]*pBiquadState->pDelays[6]; + + // ynL+=( -B1 (Q14) * y(n-1)L (Q0) ) in Q14 + ynL+=(LVM_INT32)pBiquadState->coefs[4]*pBiquadState->pDelays[4]; + + ynL=ynL>>14; // ynL in Q0 format + + /************************************************************************** + 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 (Q0) ) in Q14 + ynR+=(LVM_INT32)pBiquadState->coefs[3]*pBiquadState->pDelays[7]; + + // ynR+=( -B1 (Q14) * y(n-1)R (Q0) ) in Q14 + ynR+=(LVM_INT32)pBiquadState->coefs[4]*pBiquadState->pDelays[5]; + + ynR=ynR>>14; // ynL in Q0 format + /************************************************************************** + 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 + pBiquadState->pDelays[1]=(*pDataIn++); // Update x(n-1)R in Q0 + + /************************************************************************** + WRITING THE OUTPUT + ***************************************************************************/ + *pDataOut++=(LVM_INT16)ynL; // Write Left output in Q0 + *pDataOut++=(LVM_INT16)ynR; // Write Right ouput in Q0 + + + } + + } + |