/* * 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. */ /****************************************************************************************/ /* */ /* 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); }