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/*
* 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 "DC_2I_D16_TRC_WRA_01_Private.h"
#include "LVM_Macros.h"
void DC_2I_D16_TRC_WRA_01( Biquad_Instance_t *pInstance,
LVM_INT16 *pDataIn,
LVM_INT16 *pDataOut,
LVM_INT16 NrSamples)
{
LVM_INT32 LeftDC,RightDC;
LVM_INT32 Diff;
LVM_INT32 j;
PFilter_State pBiquadState = (PFilter_State) pInstance;
LeftDC = pBiquadState->LeftDC;
RightDC = pBiquadState->RightDC;
for(j=NrSamples-1;j>=0;j--)
{
/* Subtract DC an saturate */
Diff=*(pDataIn++)-(LeftDC>>16);
if (Diff > 32767) {
Diff = 32767; }
else if (Diff < -32768) {
Diff = -32768; }
*(pDataOut++)=(LVM_INT16)Diff;
if (Diff < 0) {
LeftDC -= DC_D16_STEP; }
else {
LeftDC += DC_D16_STEP; }
/* Subtract DC an saturate */
Diff=*(pDataIn++)-(RightDC>>16);
if (Diff > 32767) {
Diff = 32767; }
else if (Diff < -32768) {
Diff = -32768; }
*(pDataOut++)=(LVM_INT16)Diff;
if (Diff < 0) {
RightDC -= DC_D16_STEP; }
else {
RightDC += DC_D16_STEP; }
}
pBiquadState->LeftDC = LeftDC;
pBiquadState->RightDC = RightDC;
}
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