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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: 1315 $
$Date: 2010-07-23 11:52:08 +0200 (Fri, 23 Jul 2010) $
*************************************************************************************/
/************************************************************************************/
/* */
/* Includes */
/* */
/************************************************************************************/
#include "LVCS.h"
#include "LVCS_Private.h"
#include "LVCS_StereoEnhancer.h"
#include "VectorArithmetic.h"
#include "LVCS_Tables.h"
/************************************************************************************/
/* */
/* FUNCTION: LVCS_StereoEnhanceInit */
/* */
/* DESCRIPTION: */
/* Initialises the stereo enhancement module based on the sample rate. */
/* */
/* 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. */
/* */
/* PARAMETERS: */
/* hInstance Instance Handle */
/* pParams Initialisation parameters */
/* */
/* RETURNS: */
/* LVCS_Success Always succeeds */
/* */
/* NOTES: */
/* */
/************************************************************************************/
LVCS_ReturnStatus_en LVCS_SEnhancerInit(LVCS_Handle_t hInstance,
LVCS_Params_t *pParams)
{
LVM_UINT16 Offset;
LVCS_Instance_t *pInstance = (LVCS_Instance_t *)hInstance;
LVCS_StereoEnhancer_t *pConfig = (LVCS_StereoEnhancer_t *)&pInstance->StereoEnhancer;
LVCS_Data_t *pData = (LVCS_Data_t *)pInstance->MemoryTable.Region[LVCS_MEMREGION_PERSISTENT_FAST_DATA].pBaseAddress;
LVCS_Coefficient_t *pCoefficient = (LVCS_Coefficient_t *)pInstance->MemoryTable.Region[LVCS_MEMREGION_PERSISTENT_FAST_COEF].pBaseAddress;
FO_C16_Coefs_t CoeffsMid;
BQ_C16_Coefs_t CoeffsSide;
const BiquadA012B12CoefsSP_t *pSESideCoefs;
/*
* If the sample rate or speaker type has changed update the filters
*/
if ((pInstance->Params.SampleRate != pParams->SampleRate) ||
(pInstance->Params.SpeakerType != pParams->SpeakerType))
{
/*
* Set the filter coefficients based on the sample rate
*/
/* Mid filter */
Offset = (LVM_UINT16)pParams->SampleRate;
/* Convert incoming coefficients to the required format/ordering */
CoeffsMid.A0 = (LVM_INT16) LVCS_SEMidCoefTable[Offset].A0;
CoeffsMid.A1 = (LVM_INT16) LVCS_SEMidCoefTable[Offset].A1;
CoeffsMid.B1 = (LVM_INT16)-LVCS_SEMidCoefTable[Offset].B1;
/* Clear the taps */
LoadConst_16(0, /* Value */
(void *)&pData->SEBiquadTapsMid, /* Destination Cast to void:\
no dereferencing in function*/
(LVM_UINT16)(sizeof(pData->SEBiquadTapsMid)/sizeof(LVM_UINT16))); /* Number of words */
FO_1I_D16F16Css_TRC_WRA_01_Init(&pCoefficient->SEBiquadInstanceMid,
&pData->SEBiquadTapsMid,
&CoeffsMid);
/* Callbacks */
if(LVCS_SEMidCoefTable[Offset].Scale==15)
{
pConfig->pBiquadCallBack_Mid = FO_1I_D16F16C15_TRC_WRA_01;
}
Offset = (LVM_UINT16)(pParams->SampleRate);
pSESideCoefs = (BiquadA012B12CoefsSP_t*)&LVCS_SESideCoefTable[0];
/* Side filter */
/* Convert incoming coefficients to the required format/ordering */
CoeffsSide.A0 = (LVM_INT16) pSESideCoefs[Offset].A0;
CoeffsSide.A1 = (LVM_INT16) pSESideCoefs[Offset].A1;
CoeffsSide.A2 = (LVM_INT16) pSESideCoefs[Offset].A2;
CoeffsSide.B1 = (LVM_INT16)-pSESideCoefs[Offset].B1;
CoeffsSide.B2 = (LVM_INT16)-pSESideCoefs[Offset].B2;
/* Clear the taps */
LoadConst_16(0, /* Value */
(void *)&pData->SEBiquadTapsSide, /* Destination Cast to void:\
no dereferencing in function*/
(LVM_UINT16)(sizeof(pData->SEBiquadTapsSide)/sizeof(LVM_UINT16))); /* Number of words */
/* Callbacks */
switch(pSESideCoefs[Offset].Scale)
{
case 14:
BQ_1I_D16F32Css_TRC_WRA_01_Init(&pCoefficient->SEBiquadInstanceSide,
&pData->SEBiquadTapsSide,
&CoeffsSide);
pConfig->pBiquadCallBack_Side = BQ_1I_D16F32C14_TRC_WRA_01;
break;
case 15:
BQ_1I_D16F16Css_TRC_WRA_01_Init(&pCoefficient->SEBiquadInstanceSide,
&pData->SEBiquadTapsSide,
&CoeffsSide);
pConfig->pBiquadCallBack_Side = BQ_1I_D16F16C15_TRC_WRA_01;
break;
}
}
return(LVCS_SUCCESS);
}
/************************************************************************************/
/* */
/* FUNCTION: LVCS_StereoEnhance */
/* */
/* DESCRIPTION: */
/* Enhance the stereo image in the input samples based on the following block */
/* diagram: */
/* */
/* ________ */
/* ________ | | ________ */
/* | | Middle | Treble | | | */
/* | |---------->| Boost |-------->| | */
/* | Stereo | |________| | M & S | */
/* -->| to | ________ | to |--> */
/* | M & S | Side | | | Stereo | */
/* | |---------->| Side |-------->| | */
/* |________| | Boost | |________| */
/* |________| */
/* */
/* */
/* If the input signal is a mono signal there will be no side signal and hence */
/* the side filter will not be run. In mobile speaker mode the middle filter is */
/* not required and the Trebble boost filter is replaced by a simple gain block. */
/* */
/* */
/* PARAMETERS: */
/* hInstance Instance Handle */
/* pInData Pointer to the input data */
/* pOutData Pointer to the output data */
/* NumSamples Number of samples to process */
/* */
/* RETURNS: */
/* LVCS_Success Always succeeds */
/* */
/* NOTES: */
/* 1. The side filter is not used in Mobile Speaker mode */
/* */
/************************************************************************************/
LVCS_ReturnStatus_en LVCS_StereoEnhancer(LVCS_Handle_t hInstance,
const LVM_INT16 *pInData,
LVM_INT16 *pOutData,
LVM_UINT16 NumSamples)
{
LVCS_Instance_t *pInstance = (LVCS_Instance_t *)hInstance;
LVCS_StereoEnhancer_t *pConfig = (LVCS_StereoEnhancer_t *)&pInstance->StereoEnhancer;
LVCS_Coefficient_t *pCoefficient = (LVCS_Coefficient_t *)pInstance->MemoryTable.Region[LVCS_MEMREGION_PERSISTENT_FAST_COEF].pBaseAddress;
LVM_INT16 *pScratch = (LVM_INT16 *)pInstance->MemoryTable.Region[LVCS_MEMREGION_TEMPORARY_FAST].pBaseAddress;
/*
* Check if the Stereo Enhancer is enabled
*/
if ((pInstance->Params.OperatingMode & LVCS_STEREOENHANCESWITCH) != 0)
{
/*
* Convert from stereo to middle and side
*/
From2iToMS_16x16(pInData,
pScratch,
pScratch+NumSamples,
(LVM_INT16)NumSamples);
/*
* Apply filter to the middle signal
*/
if (pInstance->OutputDevice == LVCS_HEADPHONE)
{
(pConfig->pBiquadCallBack_Mid)((Biquad_Instance_t*)&pCoefficient->SEBiquadInstanceMid,
(LVM_INT16 *)pScratch,
(LVM_INT16 *)pScratch,
(LVM_INT16)NumSamples);
}
else
{
Mult3s_16x16(pScratch, /* Source */
(LVM_INT16)pConfig->MidGain, /* Gain */
pScratch, /* Destination */
(LVM_INT16)NumSamples); /* Number of samples */
}
/*
* Apply the filter the side signal only in stereo mode for headphones
* and in all modes for mobile speakers
*/
if (pInstance->Params.SourceFormat == LVCS_STEREO)
{
(pConfig->pBiquadCallBack_Side)((Biquad_Instance_t*)&pCoefficient->SEBiquadInstanceSide,
(LVM_INT16 *)(pScratch + NumSamples),
(LVM_INT16 *)(pScratch + NumSamples),
(LVM_INT16)NumSamples);
}
/*
* Convert from middle and side to stereo
*/
MSTo2i_Sat_16x16(pScratch,
pScratch+NumSamples,
pOutData,
(LVM_INT16)NumSamples);
}
else
{
/*
* The stereo enhancer is disabled so just copy the data
*/
Copy_16((LVM_INT16 *)pInData, /* Source */
(LVM_INT16 *)pOutData, /* Destination */
(LVM_INT16)(2*NumSamples)); /* Left and right */
}
return(LVCS_SUCCESS);
}
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