| /* |
| * 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 <audio_utils/BiquadFilter.h> |
| |
| #include <string.h> // memset |
| #include "LVDBE.h" |
| #include "LVDBE_Private.h" |
| #include "VectorArithmetic.h" |
| #include "AGC.h" |
| #include "LVDBE_Coeffs.h" /* Filter coefficients */ |
| #include <log/log.h> |
| |
| /********************************************************************************************/ |
| /* */ |
| /* 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_FLOAT* pInData, LVM_FLOAT* pOutData, |
| const LVM_UINT16 NrFrames) // updated to use samples = frames * channels. |
| { |
| LVDBE_Instance_t* pInstance = (LVDBE_Instance_t*)hInstance; |
| |
| /*Extract number of Channels info*/ |
| // Mono passed in as stereo |
| const LVM_INT32 NrChannels = |
| pInstance->Params.NrChannels == 1 ? 2 : pInstance->Params.NrChannels; |
| const LVM_INT32 NrSamples = NrChannels * NrFrames; |
| |
| /* Space to store DBE path computation */ |
| LVM_FLOAT* const pScratch = (LVM_FLOAT*)pInstance->pScratch; |
| |
| /* |
| * Scratch for Mono path starts at offset of |
| * NrSamples float values from pScratch. |
| */ |
| LVM_FLOAT* const pMono = pScratch + NrSamples; |
| |
| /* |
| * TRICKY: pMono is used and discarded by the DBE path. |
| * so it is available for use for the pScratchVol |
| * path which is computed afterwards. |
| * |
| * Space to store Volume Control path computation. |
| * This is identical to pMono (see TRICKY comment). |
| */ |
| LVM_FLOAT* const pScratchVol = pMono; |
| |
| /* |
| * Check the number of frames is not too large |
| */ |
| if (NrFrames > 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]))) { |
| // make copy of input data |
| Copy_Float(pInData, pScratch, (LVM_INT16)NrSamples); |
| |
| /* |
| * Apply the high pass filter if selected |
| */ |
| if (pInstance->Params.HPFSelect == LVDBE_HPF_ON) { |
| pInstance->pHPFBiquad->process(pScratch, pScratch, NrFrames); |
| } |
| |
| /* |
| * Create the mono stream |
| */ |
| FromMcToMono_Float(pScratch, /* Source */ |
| pMono, /* Mono destination */ |
| (LVM_INT16)NrFrames, /* Number of frames */ |
| (LVM_INT16)NrChannels); |
| |
| /* |
| * Apply the band pass filter |
| */ |
| pInstance->pBPFBiquad->process(pMono, pMono, NrFrames); |
| |
| /* |
| * Apply the AGC and mix |
| */ |
| AGC_MIX_VOL_Mc1Mon_D32_WRA(&pInstance->pData->AGCInstance, /* Instance pointer */ |
| pScratch, /* Source */ |
| pMono, /* Mono band pass source */ |
| pScratch, /* Destination */ |
| NrFrames, /* Number of frames */ |
| NrChannels); /* Number of channels */ |
| } else { |
| // clear DBE processed path |
| memset(pScratch, 0, sizeof(*pScratch) * NrSamples); |
| } |
| |
| /* 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_Mc_D16C31_SAT(&pInstance->pData->BypassVolume, pInData, pScratchVol, |
| (LVM_INT16)NrFrames, (LVM_INT16)NrChannels); |
| } else { |
| // clear bypass volume path |
| memset(pScratchVol, 0, sizeof(*pScratchVol) * NrSamples); |
| } |
| |
| /* |
| * Mix DBE processed path and bypass volume path |
| */ |
| LVC_MixSoft_2Mc_D16C31_SAT(&pInstance->pData->BypassMixer, pScratch, pScratchVol, pOutData, |
| (LVM_INT16)NrFrames, (LVM_INT16)NrChannels); |
| return LVDBE_SUCCESS; |
| } |
