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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:: PSA_01_ARMC_01 */
/* $Author: beq07716 $*/
/* $Revision: 1006 $*/
/* $Date: 2010-06-28 14:01:47 +0200 (Mon, 28 Jun 2010) $*/
/* */
/************************************************************************/
#include "LVPSA_QPD.h"
#include "LVPSA_Private.h"
/************************************************************************************/
/* */
/* FUNCTION: LVPSA_QPD_WritePeak */
/* */
/* DESCRIPTION: */
/* Write a level value in the buffer in the corresponding band. */
/* */
/* PARAMETERS: */
/* pInst Pointer to the LVPSA instance */
/* ppWrite Pointer to pointer to the buffer */
/* CallNumber Number of the band the value should be written in */
/* Value Value to write in the buffer */
/* */
/* RETURNS: void */
/* */
/************************************************************************************/
void LVPSA_QPD_WritePeak( pLVPSA_InstancePr_t pLVPSA_Inst,
LVM_UINT8 **ppWrite,
LVM_INT16 BandIndex,
LVM_INT16 Value );
/************************************************************************************/
/* */
/* FUNCTION: LVPSA_QPD_Process */
/* */
/* DESCRIPTION: */
/* Apply downsampling, post gain, quasi peak filtering and write the levels values */
/* in the buffer every 20 ms. */
/* */
/* PARAMETERS: */
/* */
/* RETURNS: void */
/* */
/************************************************************************************/
void LVPSA_QPD_Process ( void *hInstance,
LVM_INT16 *pInSamps,
LVM_INT16 numSamples,
LVM_INT16 BandIndex)
{
/******************************************************************************
PARAMETERS
*******************************************************************************/
LVPSA_InstancePr_t *pLVPSA_Inst = (LVPSA_InstancePr_t*)hInstance;
QPD_State_t *pQPDState = (QPD_State_t*)&pLVPSA_Inst->pQPD_States[BandIndex];
/* Pointer to taps */
LVM_INT32* pDelay = pQPDState->pDelay;
/* Parameters needed during quasi peak calculations */
LVM_INT32 X0;
LVM_INT32 temp,temp2;
LVM_INT32 accu;
LVM_INT16 Xg0;
LVM_INT16 D0;
LVM_INT16 V0 = (LVM_INT16)(*pDelay);
/* Filter's coef */
LVM_INT32 Kp = pQPDState->Coefs[0];
LVM_INT32 Km = pQPDState->Coefs[1];
LVM_INT16 ii = numSamples;
LVM_UINT8 *pWrite = pLVPSA_Inst->pSpectralDataBufferWritePointer;
LVM_INT32 BufferUpdateSamplesCount = pLVPSA_Inst->BufferUpdateSamplesCount;
LVM_UINT16 DownSamplingFactor = pLVPSA_Inst->DownSamplingFactor;
/******************************************************************************
INITIALIZATION
*******************************************************************************/
/* Correct the pointer to take the first down sampled signal sample */
pInSamps += pLVPSA_Inst->DownSamplingCount;
/* Correct also the number of samples */
ii = (LVM_INT16)(ii - (LVM_INT16)pLVPSA_Inst->DownSamplingCount);
while (ii > 0)
{
/* Apply post gain */
X0 = ((*pInSamps) * pLVPSA_Inst->pPostGains[BandIndex]) >> (LVPSA_GAINSHIFT-1); /* - 1 to compensate scaling in process function*/
pInSamps = pInSamps + DownSamplingFactor;
/* Saturate and take absolute value */
if(X0 < 0)
X0 = -X0;
if (X0 > 0x7FFF)
Xg0 = 0x7FFF;
else
Xg0 = (LVM_INT16)(X0);
/* Quasi peak filter calculation */
D0 = (LVM_INT16)(Xg0 - V0);
temp2 = (LVM_INT32)D0;
MUL32x32INTO32(temp2,Kp,accu,31);
D0 = (LVM_INT16)(D0>>1);
if (D0 < 0){
D0 = (LVM_INT16)(-D0);
}
temp2 = (LVM_INT32)D0;
MUL32x32INTO32((LVM_INT32)D0,Km,temp,31);
accu +=temp + Xg0;
if (accu > 0x7FFF)
accu = 0x7FFF;
else if(accu < 0)
accu = 0x0000;
V0 = (LVM_INT16)accu;
if(((pLVPSA_Inst->nSamplesBufferUpdate - BufferUpdateSamplesCount) < DownSamplingFactor))
{
LVPSA_QPD_WritePeak( pLVPSA_Inst,
&pWrite,
BandIndex,
V0);
BufferUpdateSamplesCount -= pLVPSA_Inst->nSamplesBufferUpdate;
pLVPSA_Inst->LocalSamplesCount = (LVM_UINT16)(numSamples - ii);
}
BufferUpdateSamplesCount+=DownSamplingFactor;
ii = (LVM_INT16)(ii-DownSamplingFactor);
}
/* Store last taps in memory */
*pDelay = (LVM_INT32)(V0);
/* If this is the last call to the function after last band processing,
update the parameters. */
if(BandIndex == (pLVPSA_Inst->nRelevantFilters-1))
{
pLVPSA_Inst->pSpectralDataBufferWritePointer = pWrite;
/* Adjustment for 11025Hz input, 220,5 is normally
the exact number of samples for 20ms.*/
if((pLVPSA_Inst->pSpectralDataBufferWritePointer != pWrite)&&(pLVPSA_Inst->CurrentParams.Fs == LVM_FS_11025))
{
if(pLVPSA_Inst->nSamplesBufferUpdate == 220)
{
pLVPSA_Inst->nSamplesBufferUpdate = 221;
}
else
{
pLVPSA_Inst->nSamplesBufferUpdate = 220;
}
}
pLVPSA_Inst->pSpectralDataBufferWritePointer = pWrite;
pLVPSA_Inst->BufferUpdateSamplesCount = BufferUpdateSamplesCount;
pLVPSA_Inst->DownSamplingCount = (LVM_UINT16)(-ii);
}
}
/************************************************************************************/
/* */
/* FUNCTION: LVPSA_QPD_WritePeak */
/* */
/* DESCRIPTION: */
/* Write a level value in the spectrum data buffer in the corresponding band. */
/* */
/* PARAMETERS: */
/* pLVPSA_Inst Pointer to the LVPSA instance */
/* ppWrite Pointer to pointer to the buffer */
/* CallNumber Number of the band the value should be written in */
/* Value Value to write in the spectrum data buffer */
/* */
/* RETURNS: void */
/* */
/************************************************************************************/
void LVPSA_QPD_WritePeak( pLVPSA_InstancePr_t pLVPSA_Inst,
LVM_UINT8 **ppWrite,
LVM_INT16 BandIndex,
LVM_INT16 Value )
{
LVM_UINT8 *pWrite = *ppWrite;
/* Write the value and update the write pointer */
*(pWrite + BandIndex) = (LVM_UINT8)(Value>>7);
pWrite += pLVPSA_Inst->nBands;
if (pWrite == (pLVPSA_Inst->pSpectralDataBufferStart + pLVPSA_Inst->nBands * pLVPSA_Inst->SpectralDataBufferLength))
{
pWrite = pLVPSA_Inst->pSpectralDataBufferStart;
}
*ppWrite = pWrite;
}
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