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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: beq06068 $
$Revision: 1400 $
$Date: 2010-08-03 09:22:37 +0200 (Tue, 03 Aug 2010) $
*****************************************************************************************/
/****************************************************************************************/
/* */
/* Includes */
/* */
/****************************************************************************************/
#include "LVDBE.h"
#include "LVDBE_Private.h"
#include "VectorArithmetic.h"
#include "AGC.h"
#include "LVDBE_Coeffs.h" /* Filter coefficients */
/********************************************************************************************/
/* */
/* FUNCTION: LVDBE_Process */
/* */
/* DESCRIPTION: */
/* Process function for the Bass Enhancement module. */
/* */
/* Data can be processed in two formats, stereo or mono-in-stereo. Data in mono */
/* format is not supported, the calling routine must convert the mono stream to */
/* mono-in-stereo. */
/* ___________ */
/* ________ | | ________ */
/* | | _____ |------------------------->| | | | */
/* | 16-bit | | | | ________ | | | 32-bit | */
/* -+-->| to |-->| HPF |--| | | _____ | AGC Mixer |-->| to |--| */
/* | | 32-bit | |_____| | | Stereo | | | | | | 16-bit | | */
/* | |________| |-->| to |-->| BPF |-->| | |________| 0 */
/* | | Mono | |_____| |___________| \--> */
/* | |________| */
/* | _________ 0 */
/* | | | | */
/* |----------------------------------------------------| Volume |-----------------| */
/* | Control | */
/* |_________| */
/* */
/* PARAMETERS: */
/* hInstance Instance handle */
/* pInData Pointer to the input data */
/* pOutData Pointer to the output data */
/* NumSamples Number of samples in the input buffer */
/* */
/* RETURNS: */
/* LVDBE_SUCCESS Succeeded */
/* LVDBE_TOOMANYSAMPLES NumSamples was larger than the maximum block size */
/* */
/* NOTES: */
/* 1. The input and output data must be 32-bit format. The input is scaled by a shift */
/* when converting from 16-bit format, this scaling allows for internal headroom in the */
/* bass enhancement algorithm. */
/* 2. For a 16-bit implementation the converstion to 32-bit is removed and replaced with */
/* the headroom loss. This headroom loss is compensated in the volume control so the */
/* overall end to end gain is odB. */
/* */
/********************************************************************************************/
LVDBE_ReturnStatus_en LVDBE_Process(LVDBE_Handle_t hInstance,
const LVM_INT16 *pInData,
LVM_INT16 *pOutData,
LVM_UINT16 NumSamples)
{
LVDBE_Instance_t *pInstance =(LVDBE_Instance_t *)hInstance;
LVM_INT32 *pScratch = (LVM_INT32 *)pInstance->MemoryTable.Region[LVDBE_MEMREGION_SCRATCH].pBaseAddress;
LVM_INT32 *pMono;
LVM_INT16 *pInput = (LVM_INT16 *)pInData;
/* Scratch for Volume Control starts at offset of 2*NumSamples short values from pScratch */
LVM_INT16 *pScratchVol = (LVM_INT16 *)(&pScratch[NumSamples]);
/* Scratch for Mono path starts at offset of 2*NumSamples 32-bit values from pScratch */
pMono = &pScratch[2*NumSamples];
/*
* Check the number of samples is not too large
*/
if (NumSamples > pInstance->Capabilities.MaxBlockSize)
{
return(LVDBE_TOOMANYSAMPLES);
}
/*
* Check if the algorithm is enabled
*/
/* DBE path is processed when DBE is ON or during On/Off transitions */
if ((pInstance->Params.OperatingMode == LVDBE_ON)||
(LVC_Mixer_GetCurrent(&pInstance->pData->BypassMixer.MixerStream[0])
!=LVC_Mixer_GetTarget(&pInstance->pData->BypassMixer.MixerStream[0])))
{
/*
* Convert 16-bit samples to 32-bit and scale
* (For a 16-bit implementation apply headroom loss here)
*/
Int16LShiftToInt32_16x32(pInput, /* Source 16-bit data */
pScratch, /* Dest. 32-bit data */
(LVM_INT16)(2*NumSamples), /* Left and right */
LVDBE_SCALESHIFT); /* Shift scale */
/*
* Apply the high pass filter if selected
*/
if (pInstance->Params.HPFSelect == LVDBE_HPF_ON)
{
BQ_2I_D32F32C30_TRC_WRA_01(&pInstance->pCoef->HPFInstance,/* Filter instance */
(LVM_INT32 *)pScratch, /* Source */
(LVM_INT32 *)pScratch, /* Destination */
(LVM_INT16)NumSamples); /* Number of samples */
}
/*
* Create the mono stream
*/
From2iToMono_32(pScratch, /* Stereo source */
pMono, /* Mono destination */
(LVM_INT16)NumSamples); /* Number of samples */
/*
* Apply the band pass filter
*/
BP_1I_D32F32C30_TRC_WRA_02(&pInstance->pCoef->BPFInstance, /* Filter instance */
(LVM_INT32 *)pMono, /* Source */
(LVM_INT32 *)pMono, /* Destination */
(LVM_INT16)NumSamples); /* Number of samples */
/*
* Apply the AGC and mix
*/
AGC_MIX_VOL_2St1Mon_D32_WRA(&pInstance->pData->AGCInstance, /* Instance pointer */
pScratch, /* Stereo source */
pMono, /* Mono band pass source */
pScratch, /* Stereo destination */
NumSamples); /* Number of samples */
/*
* Convert 32-bit samples to 16-bit and saturate
* (Not required for 16-bit implemenations)
*/
Int32RShiftToInt16_Sat_32x16(pScratch, /* Source 32-bit data */
(LVM_INT16 *)pScratch, /* Dest. 16-bit data */
(LVM_INT16)(2*NumSamples), /* Left and right */
LVDBE_SCALESHIFT); /* Shift scale */
}
/* Bypass Volume path is processed when DBE is OFF or during On/Off transitions */
if ((pInstance->Params.OperatingMode == LVDBE_OFF)||
(LVC_Mixer_GetCurrent(&pInstance->pData->BypassMixer.MixerStream[1])
!=LVC_Mixer_GetTarget(&pInstance->pData->BypassMixer.MixerStream[1])))
{
/*
* The algorithm is disabled but volume management is required to compensate for
* headroom and volume (if enabled)
*/
LVC_MixSoft_1St_D16C31_SAT(&pInstance->pData->BypassVolume,
pInData,
pScratchVol,
(LVM_INT16)(2*NumSamples)); /* Left and right */
}
/*
* Mix DBE processed path and bypass volume path
*/
LVC_MixSoft_2St_D16C31_SAT(&pInstance->pData->BypassMixer,
(LVM_INT16 *) pScratch,
pScratchVol,
pOutData,
(LVM_INT16)(2*NumSamples));
return(LVDBE_SUCCESS);
}
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