diff options
Diffstat (limited to 'media/libeffects/lvm/lib/Common/src/BP_1I_D16F32Cll_TRC_WRA_01_Init.c')
-rwxr-xr-x | media/libeffects/lvm/lib/Common/src/BP_1I_D16F32Cll_TRC_WRA_01_Init.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/media/libeffects/lvm/lib/Common/src/BP_1I_D16F32Cll_TRC_WRA_01_Init.c b/media/libeffects/lvm/lib/Common/src/BP_1I_D16F32Cll_TRC_WRA_01_Init.c new file mode 100755 index 0000000..c560085 --- /dev/null +++ b/media/libeffects/lvm/lib/Common/src/BP_1I_D16F32Cll_TRC_WRA_01_Init.c @@ -0,0 +1,69 @@ +/* + * 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. + */ + +/* */ +/* $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" + + +/*-------------------------------------------------------------------------*/ +/* FUNCTION: */ +/* BP_1I_D16F32Cll_TRC_WRA_01_Init */ +/* */ +/* DESCRIPTION: */ +/* These functions initializes a Band pass filter (BIQUAD) */ +/* biquadratic Filter Sections. */ +/* */ +/* PARAMETERS: */ +/* pInstance - output, returns the pointer to the State Variable */ +/* This state pointer must be passed to any subsequent */ +/* call to "Biquad" functions. */ +/* pTaps - input, pointer to the taps memory */ +/* pCoef - input, pointer to the coefficient structure */ +/* N - M coefficient factor of QM.N */ +/* */ +/* The coefficients are modified in the init() function such that lower */ +/* half word is right shifted by one and most significant bit of the lower */ +/* word is made to be zero. */ +/* */ +/* Reason: For MIPS effciency,we are using DSP 32*16 multiplication */ +/* instruction. But we have 32*32 multiplication. This can be realized by two 32*16 */ +/* multiplication. But 16th bit in the 32 bit word is not a sign bit. So this is done */ +/* by putting 16th bit to zero and lossing one bit precision by division of lower */ +/* half word by 2. */ +/* RETURNS: */ +/* void return code */ +/*-------------------------------------------------------------------------*/ +void BP_1I_D16F32Cll_TRC_WRA_01_Init ( Biquad_Instance_t *pInstance, + Biquad_1I_Order2_Taps_t *pTaps, + BP_C32_Coefs_t *pCoef) +{ + PFilter_State pBiquadState = (PFilter_State) pInstance; + pBiquadState->pDelays =(LVM_INT32 *) pTaps; + + pBiquadState->coefs[0] = pCoef->A0; + pBiquadState->coefs[1] = pCoef->B2; + pBiquadState->coefs[2] = pCoef->B1; +} +/*-------------------------------------------------------------------------*/ +/* End Of File: BP_1I_D16F32Cll_TRC_WRA_01_Init.c */ + |