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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.
*/
/************************************************************************************
$Author: nxp007753 $
$Revision: 1331 $
$Date: 2010-07-27 12:26:23 +0200 (Tue, 27 Jul 2010) $
*************************************************************************************/
/************************************************************************************/
/* */
/* Includes */
/* */
/************************************************************************************/
#include "LVCS.h"
#include "LVCS_Private.h"
#include "LVCS_Equaliser.h"
#include "BIQUAD.h"
#include "VectorArithmetic.h"
#include "LVCS_Tables.h"
/************************************************************************************/
/* */
/* FUNCTION: LVCS_EqualiserInit */
/* */
/* DESCRIPTION: */
/* Initialises the equaliser module */
/* */
/* The function selects the coefficients for the filters and clears the data */
/* history. It is also used for re-initialisation when one of the system control */
/* parameters changes but will only change the coefficients and clear the history */
/* if the sample rate or speaker type has changed. */
/* */
/* To avoid excessive testing during the sample processing the biquad type is */
/* set as a callback function in the init routine. */
/* */
/* PARAMETERS: */
/* hInstance Instance Handle */
/* pParams Initialisation parameters */
/* */
/* RETURNS: */
/* LVCS_Success Always succeeds */
/* */
/* NOTES: */
/* */
/************************************************************************************/
LVCS_ReturnStatus_en LVCS_EqualiserInit(LVCS_Handle_t hInstance,
LVCS_Params_t *pParams)
{
LVM_UINT16 Offset;
LVCS_Instance_t *pInstance = (LVCS_Instance_t *)hInstance;
LVCS_Equaliser_t *pConfig = (LVCS_Equaliser_t *)&pInstance->Equaliser;
LVCS_Data_t *pData = (LVCS_Data_t *)pInstance->MemoryTable.Region[LVCS_MEMREGION_PERSISTENT_FAST_DATA].pBaseAddress;
LVCS_Coefficient_t *pCoefficients = (LVCS_Coefficient_t *)pInstance->MemoryTable.Region[LVCS_MEMREGION_PERSISTENT_FAST_COEF].pBaseAddress;
BQ_C16_Coefs_t Coeffs;
const BiquadA012B12CoefsSP_t *pEqualiserCoefTable;
/*
* If the sample rate changes re-initialise the filters
*/
if ((pInstance->Params.SampleRate != pParams->SampleRate) ||
(pInstance->Params.SpeakerType != pParams->SpeakerType))
{
/*
* Setup the filter coefficients and clear the history
*/
Offset = (LVM_UINT16)(pParams->SampleRate + (pParams->SpeakerType * (1+LVM_FS_48000)));
pEqualiserCoefTable = (BiquadA012B12CoefsSP_t*)&LVCS_EqualiserCoefTable[0];
/* Left and right filters */
/* Convert incoming coefficients to the required format/ordering */
Coeffs.A0 = (LVM_INT16) pEqualiserCoefTable[Offset].A0;
Coeffs.A1 = (LVM_INT16) pEqualiserCoefTable[Offset].A1;
Coeffs.A2 = (LVM_INT16) pEqualiserCoefTable[Offset].A2;
Coeffs.B1 = (LVM_INT16)-pEqualiserCoefTable[Offset].B1;
Coeffs.B2 = (LVM_INT16)-pEqualiserCoefTable[Offset].B2;
LoadConst_16((LVM_INT16)0, /* Value */
(void *)&pData->EqualiserBiquadTaps, /* Destination Cast to void:\
no dereferencing in function*/
(LVM_UINT16)(sizeof(pData->EqualiserBiquadTaps)/sizeof(LVM_INT16))); /* Number of words */
BQ_2I_D16F32Css_TRC_WRA_01_Init(&pCoefficients->EqualiserBiquadInstance,
&pData->EqualiserBiquadTaps,
&Coeffs);
/* Callbacks */
switch(pEqualiserCoefTable[Offset].Scale)
{
case 13:
pConfig->pBiquadCallBack = BQ_2I_D16F32C13_TRC_WRA_01;
break;
case 14:
pConfig->pBiquadCallBack = BQ_2I_D16F32C14_TRC_WRA_01;
break;
case 15:
pConfig->pBiquadCallBack = BQ_2I_D16F32C15_TRC_WRA_01;
break;
}
}
return(LVCS_SUCCESS);
}
/************************************************************************************/
/* */
/* FUNCTION: LVCS_Equaliser */
/* */
/* DESCRIPTION: */
/* Apply the equaliser filter. */
/* */
/* PARAMETERS: */
/* hInstance Instance Handle */
/* pInputOutput Pointer to the input/output buffer */
/* NumSamples The number of samples to process */
/* */
/* RETURNS: */
/* LVCS_Success Always succeeds */
/* */
/* NOTES: */
/* 1. Always processes in place. */
/* */
/************************************************************************************/
LVCS_ReturnStatus_en LVCS_Equaliser(LVCS_Handle_t hInstance,
LVM_INT16 *pInputOutput,
LVM_UINT16 NumSamples)
{
LVCS_Instance_t *pInstance = (LVCS_Instance_t *)hInstance;
LVCS_Equaliser_t *pConfig = (LVCS_Equaliser_t *)&pInstance->Equaliser;
LVCS_Coefficient_t *pCoefficients = (LVCS_Coefficient_t *)pInstance->MemoryTable.Region[LVCS_MEMREGION_PERSISTENT_FAST_COEF].pBaseAddress;
/*
* Check if the equaliser is required
*/
if ((pInstance->Params.OperatingMode & LVCS_EQUALISERSWITCH) != 0)
{
/* Apply filter to the left and right channels */
(pConfig->pBiquadCallBack)((Biquad_Instance_t*)&pCoefficients->EqualiserBiquadInstance,
(LVM_INT16 *)pInputOutput,
(LVM_INT16 *)pInputOutput,
(LVM_INT16)NumSamples);
}
return(LVCS_SUCCESS);
}
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