diff options
Diffstat (limited to 'media/libeffects/lvm/lib/StereoWidening/src/LVCS_Equaliser.c')
| -rwxr-xr-x | media/libeffects/lvm/lib/StereoWidening/src/LVCS_Equaliser.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/media/libeffects/lvm/lib/StereoWidening/src/LVCS_Equaliser.c b/media/libeffects/lvm/lib/StereoWidening/src/LVCS_Equaliser.c new file mode 100755 index 0000000..ca615b0 --- /dev/null +++ b/media/libeffects/lvm/lib/StereoWidening/src/LVCS_Equaliser.c @@ -0,0 +1,167 @@ +/* + * 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_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 */ + (LVM_INT16 *)&pData->EqualiserBiquadTaps, /* Destination */ + (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); +} + |