diff options
Diffstat (limited to 'media/libeffects/lvm/lib/Common/src/BP_1I_D16F32C30_TRC_WRA_01.c')
| -rwxr-xr-x | media/libeffects/lvm/lib/Common/src/BP_1I_D16F32C30_TRC_WRA_01.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/media/libeffects/lvm/lib/Common/src/BP_1I_D16F32C30_TRC_WRA_01.c b/media/libeffects/lvm/lib/Common/src/BP_1I_D16F32C30_TRC_WRA_01.c new file mode 100755 index 0000000..f52d3db --- /dev/null +++ b/media/libeffects/lvm/lib/Common/src/BP_1I_D16F32C30_TRC_WRA_01.c @@ -0,0 +1,92 @@ +/* + * 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 "BP_1I_D16F32Cll_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 Q30 format + + DELAYS- + pBiquadState->pDelays[0] is x(n-1)L in Q0 format + pBiquadState->pDelays[1] is x(n-2)L in Q0 format + pBiquadState->pDelays[2] is y(n-1)L in Q16 format + pBiquadState->pDelays[3] is y(n-2)L in Q16 format +***************************************************************************/ + +void BP_1I_D16F32C30_TRC_WRA_01 ( Biquad_Instance_t *pInstance, + LVM_INT16 *pDataIn, + LVM_INT16 *pDataOut, + LVM_INT16 NrSamples) + + + { + LVM_INT32 ynL,templ; + LVM_INT16 ii; + PFilter_State pBiquadState = (PFilter_State) pInstance; + + for (ii = NrSamples; ii != 0; ii--) + { + + + /************************************************************************** + PROCESSING OF THE LEFT CHANNEL + ***************************************************************************/ + // ynL= (A0 (Q30) * (x(n)L (Q0) - x(n-2)L (Q0) ) >>14) in Q16 + templ= (LVM_INT32) *pDataIn-pBiquadState->pDelays[1]; + MUL32x32INTO32(pBiquadState->coefs[0],templ,ynL,14) + + // ynL+= ((-B2 (Q30) * y(n-2)L (Q16) ) >>30) in Q16 + MUL32x32INTO32(pBiquadState->coefs[1],pBiquadState->pDelays[3],templ,30) + ynL+=templ; + + // ynL+= ((-B1 (Q30) * y(n-1)L (Q16) ) >>30) in Q16 + MUL32x32INTO32(pBiquadState->coefs[2],pBiquadState->pDelays[2],templ,30) + ynL+=templ; + + /************************************************************************** + UPDATING THE DELAYS + ***************************************************************************/ + pBiquadState->pDelays[3]=pBiquadState->pDelays[2]; // y(n-2)L=y(n-1)L + pBiquadState->pDelays[1]=pBiquadState->pDelays[0]; // x(n-2)L=x(n-1)L + pBiquadState->pDelays[2]=ynL; // Update y(n-1)L in Q16 + pBiquadState->pDelays[0]=(*pDataIn++); // Update x(n-1)L in Q0 + + /************************************************************************** + WRITING THE OUTPUT + ***************************************************************************/ + *pDataOut++=(LVM_INT16)(ynL>>16); // Write Left output in Q0 + + } + + } + |