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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: beq07716 $
$Revision: 1001 $
$Date: 2010-06-28 13:23:02 +0200 (Mon, 28 Jun 2010) $
*************************************************************************************/
/************************************************************************************/
/* */
/* Includes */
/* */
/************************************************************************************/
#include "LVCS.h"
#include "LVCS_Private.h"
#include "LVCS_ReverbGenerator.h"
#include "LVC_Mixer.h"
#include "VectorArithmetic.h"
#include "BIQUAD.h"
#include "LVCS_Tables.h"
/************************************************************************************/
/* */
/* FUNCTION: LVCS_ReverbGeneratorInit */
/* */
/* DESCRIPTION: */
/* Initialises the reverb module. The delay buffer size is configured for the */
/* sample rate and the speaker type. */
/* */
/* The routine may also be called for re-initialisation, i.e. when one of the */
/* control parameters has changed. In this case the delay and filters are only */
/* re-initialised if one of the following two conditions is met: */
/* - the sample rate has changed */
/* - the speaker type changes to/from the mobile speaker */
/* */
/* */
/* PARAMETERS: */
/* hInstance Instance Handle */
/* pParams Pointer to the inialisation parameters */
/* */
/* RETURNS: */
/* LVCS_Success Always succeeds */
/* */
/* NOTES: */
/* 1. In the delay settings 'Samples' is the number of samples to the end of the */
/* buffer. */
/* 2. The numerator coefficients of the filter are negated to cause an inversion. */
/* */
/************************************************************************************/
LVCS_ReturnStatus_en LVCS_ReverbGeneratorInit(LVCS_Handle_t hInstance,
LVCS_Params_t *pParams)
{
LVM_UINT16 Delay;
LVM_UINT16 Offset;
LVCS_Instance_t *pInstance = (LVCS_Instance_t *)hInstance;
LVCS_ReverbGenerator_t *pConfig = (LVCS_ReverbGenerator_t *)&pInstance->Reverberation;
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 *pReverbCoefTable;
/*
* Initialise the delay and filters if:
* - the sample rate has changed
* - the speaker type has changed to or from the mobile speaker
*/
if(pInstance->Params.SampleRate != pParams->SampleRate ) /* Sample rate change test */
{
/*
* Setup the delay
*/
Delay = (LVM_UINT16)LVCS_StereoDelayCS[(LVM_UINT16)pParams->SampleRate];
pConfig->DelaySize = (LVM_INT16)(2 * Delay);
pConfig->DelayOffset = 0;
LoadConst_16(0, /* Value */
(LVM_INT16 *)&pConfig->StereoSamples[0], /* Destination */
(LVM_UINT16)(sizeof(pConfig->StereoSamples)/sizeof(LVM_INT16))); /* Number of words */
/*
* Setup the filters
*/
Offset = (LVM_UINT16)pParams->SampleRate;
pReverbCoefTable = (BiquadA012B12CoefsSP_t*)&LVCS_ReverbCoefTable[0];
/* Convert incoming coefficients to the required format/ordering */
Coeffs.A0 = (LVM_INT16)pReverbCoefTable[Offset].A0;
Coeffs.A1 = (LVM_INT16)pReverbCoefTable[Offset].A1;
Coeffs.A2 = (LVM_INT16)pReverbCoefTable[Offset].A2;
Coeffs.B1 = (LVM_INT16)-pReverbCoefTable[Offset].B1;
Coeffs.B2 = (LVM_INT16)-pReverbCoefTable[Offset].B2;
LoadConst_16(0, /* Value */
(LVM_INT16 *)&pData->ReverbBiquadTaps, /* Destination */
(LVM_UINT16)(sizeof(pData->ReverbBiquadTaps)/sizeof(LVM_INT16))); /* Number of words */
BQ_2I_D16F16Css_TRC_WRA_01_Init(&pCoefficients->ReverbBiquadInstance,
&pData->ReverbBiquadTaps,
&Coeffs);
/* Callbacks */
switch(pReverbCoefTable[Offset].Scale)
{
case 14:
pConfig->pBiquadCallBack = BQ_2I_D16F16C14_TRC_WRA_01;
break;
case 15:
pConfig->pBiquadCallBack = BQ_2I_D16F16C15_TRC_WRA_01;
break;
}
/*
* Setup the mixer
*/
pConfig->ProcGain = (LVM_UINT16)(HEADPHONEGAINPROC);
pConfig->UnprocGain = (LVM_UINT16)(HEADPHONEGAINUNPROC);
}
if(pInstance->Params.ReverbLevel != pParams->ReverbLevel)
{
LVM_INT32 ReverbPercentage=83886; // 1 Percent Reverb i.e 1/100 in Q 23 format
ReverbPercentage*=pParams->ReverbLevel; // Actual Reverb Level in Q 23 format
pConfig->ReverbLevel=(LVM_INT16)(ReverbPercentage>>8); // Reverb Level in Q 15 format
}
return(LVCS_SUCCESS);
}
/************************************************************************************/
/* */
/* FUNCTION: LVCS_Reverb */
/* */
/* DESCRIPTION: */
/* Create reverb using the block of input samples based on the following block */
/* diagram: */
/* ________ ________ */
/* | | | | */
/* _____ _______ | |----------->| | ______ ___ */
/* | | | | | Stereo | | L & R | | | | | */
/* -->| LPF |-->| Delay |-->| to | ____ | to |-->| Gain |-->| + |--> */
/* | |_____| |_______| | L & R | | | | Stereo | |______| |___| */
/* | | |-->| -1 |-->| | | */
/* | |________| |____| |________| | */
/* | | */
/* |-----------------------------------------------------------------------| */
/* */
/* The input buffer is broken in to sub-blocks of the size of the delay or less. */
/* This allows the delay buffer to be treated as a circular buffer but processed */
/* as a linear buffer. */
/* */
/* */
/* PARAMETERS: */
/* hInstance Instance Handle */
/* pInData Pointer to the input buffer */
/* pOutData Pointer to the output buffer */
/* NumSamples Number of samples to process */
/* */
/* RETURNS: */
/* LVCS_Success Always succeeds */
/* */
/* NOTES: */
/* 1. Process in blocks of samples the size of the delay where possible, if not */
/* the number of samples left over */
/* 2. The Gain is combined with the LPF and incorporated in to the coefficients */
/* */
/************************************************************************************/
LVCS_ReturnStatus_en LVCS_ReverbGenerator(LVCS_Handle_t hInstance,
const LVM_INT16 *pInData,
LVM_INT16 *pOutData,
LVM_UINT16 NumSamples)
{
LVCS_Instance_t *pInstance = (LVCS_Instance_t *)hInstance;
LVCS_ReverbGenerator_t *pConfig = (LVCS_ReverbGenerator_t *)&pInstance->Reverberation;
LVCS_Coefficient_t *pCoefficients = (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;
/*
* Copy the data to the output in outplace processing
*/
if (pInData != pOutData)
{
/*
* Reverb not required so just copy the data
*/
Copy_16((LVM_INT16 *)pInData, /* Source */
(LVM_INT16 *)pOutData, /* Destination */
(LVM_INT16)(2*NumSamples)); /* Left and right */
}
/*
* Check if the reverb is required
*/
if (((pInstance->Params.SpeakerType == LVCS_HEADPHONE) || /* Disable when CS4MS in stereo mode */
(pInstance->Params.SpeakerType == LVCS_EX_HEADPHONES) ||
(pInstance->Params.SourceFormat != LVCS_STEREO)) &&
((pInstance->Params.OperatingMode & LVCS_REVERBSWITCH) !=0)) /* For validation testing */
{
/********************************************************************************/
/* */
/* Copy the input data to scratch memory and filter it */
/* */
/********************************************************************************/
/*
* Copy the input data to the scratch memory
*/
Copy_16((LVM_INT16 *)pInData, /* Source */
(LVM_INT16 *)pScratch, /* Destination */
(LVM_INT16)(2*NumSamples)); /* Left and right */
/*
* Filter the data
*/
(pConfig->pBiquadCallBack)((Biquad_Instance_t*)&pCoefficients->ReverbBiquadInstance,
(LVM_INT16 *)pScratch,
(LVM_INT16 *)pScratch,
(LVM_INT16)NumSamples);
Mult3s_16x16( (LVM_INT16 *)pScratch,
pConfig->ReverbLevel,
(LVM_INT16 *)pScratch,
(LVM_INT16)(2*NumSamples));
/*
* Apply the delay mix
*/
DelayMix_16x16((LVM_INT16 *)pScratch,
&pConfig->StereoSamples[0],
pConfig->DelaySize,
pOutData,
&pConfig->DelayOffset,
(LVM_INT16)NumSamples);
}
return(LVCS_SUCCESS);
}
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