| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. |
| All rights reserved. |
| |
| 1. INTRODUCTION |
| The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements |
| the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. |
| This FDK AAC Codec software is intended to be used on a wide variety of Android devices. |
| |
| AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual |
| audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by |
| independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part |
| of the MPEG specifications. |
| |
| Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) |
| may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners |
| individually for the purpose of encoding or decoding bit streams in products that are compliant with |
| the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license |
| these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec |
| software may already be covered under those patent licenses when it is used for those licensed purposes only. |
| |
| Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, |
| are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional |
| applications information and documentation. |
| |
| 2. COPYRIGHT LICENSE |
| |
| Redistribution and use in source and binary forms, with or without modification, are permitted without |
| payment of copyright license fees provided that you satisfy the following conditions: |
| |
| You must retain the complete text of this software license in redistributions of the FDK AAC Codec or |
| your modifications thereto in source code form. |
| |
| You must retain the complete text of this software license in the documentation and/or other materials |
| provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. |
| You must make available free of charge copies of the complete source code of the FDK AAC Codec and your |
| modifications thereto to recipients of copies in binary form. |
| |
| The name of Fraunhofer may not be used to endorse or promote products derived from this library without |
| prior written permission. |
| |
| You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec |
| software or your modifications thereto. |
| |
| Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software |
| and the date of any change. For modified versions of the FDK AAC Codec, the term |
| "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term |
| "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." |
| |
| 3. NO PATENT LICENSE |
| |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, |
| ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with |
| respect to this software. |
| |
| You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized |
| by appropriate patent licenses. |
| |
| 4. DISCLAIMER |
| |
| This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors |
| "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties |
| of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, |
| including but not limited to procurement of substitute goods or services; loss of use, data, or profits, |
| or business interruption, however caused and on any theory of liability, whether in contract, strict |
| liability, or tort (including negligence), arising in any way out of the use of this software, even if |
| advised of the possibility of such damage. |
| |
| 5. CONTACT INFORMATION |
| |
| Fraunhofer Institute for Integrated Circuits IIS |
| Attention: Audio and Multimedia Departments - FDK AAC LL |
| Am Wolfsmantel 33 |
| 91058 Erlangen, Germany |
| |
| www.iis.fraunhofer.de/amm |
| amm-info@iis.fraunhofer.de |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /*! |
| \file |
| \brief rvlc concealment |
| \author Josef Hoepfl |
| */ |
| |
| #include "rvlcconceal.h" |
| |
| |
| #include "block.h" |
| #include "rvlc.h" |
| |
| /*--------------------------------------------------------------------------------------------- |
| function: calcRefValFwd |
| |
| description: The function determines the scalefactor which is closed to the scalefactorband |
| conceal_min. The same is done for intensity data and noise energies. |
| ----------------------------------------------------------------------------------------------- |
| output: - reference value scf |
| - reference value internsity data |
| - reference value noise energy |
| ----------------------------------------------------------------------------------------------- |
| return: - |
| -------------------------------------------------------------------------------------------- */ |
| |
| static |
| void calcRefValFwd (CErRvlcInfo *pRvlc, |
| CAacDecoderChannelInfo *pAacDecoderChannelInfo, |
| int *refIsFwd, |
| int *refNrgFwd, |
| int *refScfFwd) |
| { |
| int band,bnds,group,startBand; |
| int idIs,idNrg,idScf; |
| int conceal_min,conceal_group_min; |
| int MaximumScaleFactorBands; |
| |
| |
| if (GetWindowSequence(&pAacDecoderChannelInfo->icsInfo) == EightShortSequence) |
| MaximumScaleFactorBands = 16; |
| else |
| MaximumScaleFactorBands = 64; |
| |
| conceal_min = pRvlc->conceal_min % MaximumScaleFactorBands; |
| conceal_group_min = pRvlc->conceal_min / MaximumScaleFactorBands; |
| |
| /* calculate first reference value for approach in forward direction */ |
| idIs = idNrg = idScf = 1; |
| |
| /* set reference values */ |
| *refIsFwd = - SF_OFFSET; |
| *refNrgFwd = pAacDecoderChannelInfo->pDynData->RawDataInfo.GlobalGain - SF_OFFSET - 90 - 256; |
| *refScfFwd = pAacDecoderChannelInfo->pDynData->RawDataInfo.GlobalGain - SF_OFFSET; |
| |
| startBand = conceal_min-1; |
| for (group=conceal_group_min; group >= 0; group--) { |
| for (band=startBand; band >= 0; band--) { |
| bnds = 16*group+band; |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| break; |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| if (idIs) { |
| *refIsFwd = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| idIs=0; /* reference value has been set */ |
| } |
| break; |
| case NOISE_HCB: |
| if (idNrg) { |
| *refNrgFwd = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| idNrg=0; /* reference value has been set */ |
| } |
| break ; |
| default: |
| if (idScf) { |
| *refScfFwd = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| idScf=0; /* reference value has been set */ |
| } |
| break; |
| } |
| } |
| startBand = pRvlc->maxSfbTransmitted-1; |
| } |
| |
| } |
| |
| /*--------------------------------------------------------------------------------------------- |
| function: calcRefValBwd |
| |
| description: The function determines the scalefactor which is closed to the scalefactorband |
| conceal_max. The same is done for intensity data and noise energies. |
| ----------------------------------------------------------------------------------------------- |
| output: - reference value scf |
| - reference value internsity data |
| - reference value noise energy |
| ----------------------------------------------------------------------------------------------- |
| return: - |
| -------------------------------------------------------------------------------------------- */ |
| |
| static |
| void calcRefValBwd (CErRvlcInfo *pRvlc, |
| CAacDecoderChannelInfo *pAacDecoderChannelInfo, |
| int *refIsBwd, |
| int *refNrgBwd, |
| int *refScfBwd) |
| { |
| int band,bnds,group,startBand; |
| int idIs,idNrg,idScf; |
| int conceal_max,conceal_group_max; |
| int MaximumScaleFactorBands; |
| |
| if (GetWindowSequence(&pAacDecoderChannelInfo->icsInfo) == EightShortSequence) |
| MaximumScaleFactorBands = 16; |
| else |
| MaximumScaleFactorBands = 64; |
| |
| conceal_max = pRvlc->conceal_max % MaximumScaleFactorBands; |
| conceal_group_max = pRvlc->conceal_max / MaximumScaleFactorBands; |
| |
| /* calculate first reference value for approach in backward direction */ |
| idIs = idNrg = idScf = 1; |
| |
| /* set reference values */ |
| *refIsBwd = pRvlc->dpcm_is_last_position - SF_OFFSET; |
| *refNrgBwd = pRvlc->rev_global_gain + pRvlc->dpcm_noise_last_position - SF_OFFSET - 90 - 256 + pRvlc->dpcm_noise_nrg; |
| *refScfBwd = pRvlc->rev_global_gain - SF_OFFSET; |
| |
| startBand=conceal_max+1; |
| |
| /* if needed, re-set reference values */ |
| for (group=conceal_group_max; group < pRvlc->numWindowGroups; group++) { |
| for (band=startBand; band < pRvlc->maxSfbTransmitted; band++) { |
| bnds = 16*group+band; |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| break; |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| if (idIs) { |
| *refIsBwd = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| idIs=0; /* reference value has been set */ |
| } |
| break; |
| case NOISE_HCB: |
| if (idNrg) { |
| *refNrgBwd = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| idNrg=0; /* reference value has been set */ |
| } |
| break ; |
| default: |
| if (idScf) { |
| *refScfBwd = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| idScf=0; /* reference value has been set */ |
| } |
| break; |
| } |
| } |
| startBand=0; |
| } |
| |
| } |
| |
| |
| /*--------------------------------------------------------------------------------------------- |
| function: BidirectionalEstimation_UseLowerScfOfCurrentFrame |
| |
| description: This approach by means of bidirectional estimation is generally performed when |
| a single bit error has been detected, the bit error can be isolated between |
| 'conceal_min' and 'conceal_max' and the 'sf_concealment' flag is not set. The |
| sets of scalefactors decoded in forward and backward direction are compared |
| with each other. The smaller scalefactor will be considered as the correct one |
| respectively. The reconstruction of the scalefactors with this approach archieve |
| good results in audio quality. The strategy must be applied to scalefactors, |
| intensity data and noise energy seperately. |
| ----------------------------------------------------------------------------------------------- |
| output: Concealed scalefactor, noise energy and intensity data between conceal_min and |
| conceal_max |
| ----------------------------------------------------------------------------------------------- |
| return: - |
| -------------------------------------------------------------------------------------------- */ |
| |
| void BidirectionalEstimation_UseLowerScfOfCurrentFrame (CAacDecoderChannelInfo *pAacDecoderChannelInfo) |
| { |
| CErRvlcInfo *pRvlc = &pAacDecoderChannelInfo->pComData->overlay.aac.erRvlcInfo; |
| int band,bnds,startBand,endBand,group; |
| int conceal_min,conceal_max; |
| int conceal_group_min,conceal_group_max; |
| int MaximumScaleFactorBands; |
| |
| if (GetWindowSequence(&pAacDecoderChannelInfo->icsInfo) == EightShortSequence) { |
| MaximumScaleFactorBands = 16; |
| } |
| else { |
| MaximumScaleFactorBands = 64; |
| } |
| |
| /* If an error was detected just in forward or backward direction, set the corresponding border for concealment to a |
| appropriate scalefactor band. The border is set to first or last sfb respectively, because the error will possibly |
| not follow directly after the corrupt bit but just after decoding some more (wrong) scalefactors. */ |
| if (pRvlc->conceal_min == CONCEAL_MIN_INIT) |
| pRvlc->conceal_min = 0; |
| |
| if (pRvlc->conceal_max == CONCEAL_MAX_INIT) |
| pRvlc->conceal_max = (pRvlc->numWindowGroups-1)*16+pRvlc->maxSfbTransmitted-1; |
| |
| conceal_min = pRvlc->conceal_min % MaximumScaleFactorBands; |
| conceal_group_min = pRvlc->conceal_min / MaximumScaleFactorBands; |
| conceal_max = pRvlc->conceal_max % MaximumScaleFactorBands; |
| conceal_group_max = pRvlc->conceal_max / MaximumScaleFactorBands; |
| |
| if (pRvlc->conceal_min == pRvlc->conceal_max) { |
| |
| int refIsFwd,refNrgFwd,refScfFwd; |
| int refIsBwd,refNrgBwd,refScfBwd; |
| |
| bnds = pRvlc->conceal_min; |
| calcRefValFwd(pRvlc,pAacDecoderChannelInfo,&refIsFwd,&refNrgFwd,&refScfFwd); |
| calcRefValBwd(pRvlc,pAacDecoderChannelInfo,&refIsBwd,&refNrgBwd,&refScfBwd); |
| |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| break; |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| if (refIsFwd < refIsBwd) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = refIsFwd; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = refIsBwd; |
| break; |
| case NOISE_HCB: |
| if (refNrgFwd < refNrgBwd) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = refNrgFwd; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = refNrgBwd; |
| break; |
| default: |
| if (refScfFwd < refScfBwd) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = refScfFwd; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = refScfBwd; |
| break; |
| } |
| } |
| else { |
| pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[pRvlc->conceal_max] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[pRvlc->conceal_max]; |
| pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[pRvlc->conceal_min] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[pRvlc->conceal_min]; |
| |
| /* consider the smaller of the forward and backward decoded value as the correct one */ |
| startBand = conceal_min; |
| if (conceal_group_min == conceal_group_max) |
| endBand = conceal_max; |
| else |
| endBand = pRvlc->maxSfbTransmitted-1; |
| |
| for (group=conceal_group_min; group <= conceal_group_max; group++) { |
| for (band=startBand; band <= endBand; band++) { |
| bnds = 16*group+band; |
| if (pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds] < pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| } |
| startBand = 0; |
| if ((group+1) == conceal_group_max) |
| endBand = conceal_max; |
| } |
| } |
| |
| /* now copy all data to the output buffer which needs not to be concealed */ |
| if (conceal_group_min == 0) |
| endBand = conceal_min; |
| else |
| endBand = pRvlc->maxSfbTransmitted; |
| for (group=0; group <= conceal_group_min; group++) { |
| for (band=0; band < endBand; band++) { |
| bnds = 16*group+band; |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| } |
| if ((group+1) == conceal_group_min) |
| endBand = conceal_min; |
| } |
| |
| startBand = conceal_max+1; |
| for (group=conceal_group_max; group < pRvlc->numWindowGroups; group++) { |
| for (band=startBand; band < pRvlc->maxSfbTransmitted; band++) { |
| bnds = 16*group+band; |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| } |
| startBand = 0; |
| } |
| } |
| |
| /*--------------------------------------------------------------------------------------------- |
| function: BidirectionalEstimation_UseScfOfPrevFrameAsReference |
| |
| description: This approach by means of bidirectional estimation is generally performed when |
| a single bit error has been detected, the bit error can be isolated between |
| 'conceal_min' and 'conceal_max', the 'sf_concealment' flag is set and the |
| previous frame has the same block type as the current frame. The scalefactor |
| decoded in forward and backward direction and the scalefactor of the previous |
| frame are compared with each other. The smaller scalefactor will be considered |
| as the correct one. At this the codebook of the previous and current frame must |
| be of the same set (scf, nrg, is) in each scalefactorband. Otherwise the |
| scalefactor of the previous frame is not considered in the minimum calculation. |
| The reconstruction of the scalefactors with this approach archieve good results |
| in audio quality. The strategy must be applied to scalefactors, intensity data |
| and noise energy seperately. |
| ----------------------------------------------------------------------------------------------- |
| output: Concealed scalefactor, noise energy and intensity data between conceal_min and |
| conceal_max |
| ----------------------------------------------------------------------------------------------- |
| return: - |
| -------------------------------------------------------------------------------------------- */ |
| |
| void BidirectionalEstimation_UseScfOfPrevFrameAsReference ( |
| CAacDecoderChannelInfo *pAacDecoderChannelInfo, |
| CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo |
| ) |
| { |
| CErRvlcInfo *pRvlc = &pAacDecoderChannelInfo->pComData->overlay.aac.erRvlcInfo; |
| int band,bnds,startBand,endBand,group; |
| int conceal_min,conceal_max; |
| int conceal_group_min,conceal_group_max; |
| int MaximumScaleFactorBands; |
| int commonMin; |
| |
| if (GetWindowSequence(&pAacDecoderChannelInfo->icsInfo) == EightShortSequence) { |
| MaximumScaleFactorBands = 16; |
| } |
| else { |
| MaximumScaleFactorBands = 64; |
| } |
| |
| /* If an error was detected just in forward or backward direction, set the corresponding border for concealment to a |
| appropriate scalefactor band. The border is set to first or last sfb respectively, because the error will possibly |
| not follow directly after the corrupt bit but just after decoding some more (wrong) scalefactors. */ |
| if (pRvlc->conceal_min == CONCEAL_MIN_INIT) |
| pRvlc->conceal_min = 0; |
| |
| if (pRvlc->conceal_max == CONCEAL_MAX_INIT) |
| pRvlc->conceal_max = (pRvlc->numWindowGroups-1)*16+pRvlc->maxSfbTransmitted-1; |
| |
| conceal_min = pRvlc->conceal_min % MaximumScaleFactorBands; |
| conceal_group_min = pRvlc->conceal_min / MaximumScaleFactorBands; |
| conceal_max = pRvlc->conceal_max % MaximumScaleFactorBands; |
| conceal_group_max = pRvlc->conceal_max / MaximumScaleFactorBands; |
| |
| pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[pRvlc->conceal_max] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[pRvlc->conceal_max]; |
| pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[pRvlc->conceal_min] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[pRvlc->conceal_min]; |
| |
| /* consider the smaller of the forward and backward decoded value as the correct one */ |
| startBand = conceal_min; |
| if (conceal_group_min == conceal_group_max) |
| endBand = conceal_max; |
| else |
| endBand = pRvlc->maxSfbTransmitted-1; |
| |
| for (group=conceal_group_min; group <= conceal_group_max; group++) { |
| for (band=startBand; band <= endBand; band++) { |
| bnds = 16*group+band; |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = 0; |
| break; |
| |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| if ( (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]==INTENSITY_HCB) || (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]==INTENSITY_HCB2) ) { |
| commonMin = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(commonMin, pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousScaleFactor[bnds]); |
| } |
| else { |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| } |
| break; |
| |
| case NOISE_HCB: |
| if ( pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]==NOISE_HCB ) { |
| commonMin = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(commonMin, pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousScaleFactor[bnds]); |
| } else { |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| } |
| break; |
| |
| default: |
| if ( (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=ZERO_HCB) |
| && (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=NOISE_HCB) |
| && (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=INTENSITY_HCB) |
| && (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=INTENSITY_HCB2) ) |
| { |
| commonMin = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds], pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(commonMin, pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousScaleFactor[bnds]); |
| } else { |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| } |
| break; |
| } |
| } |
| startBand = 0; |
| if ((group+1) == conceal_group_max) |
| endBand = conceal_max; |
| } |
| |
| /* now copy all data to the output buffer which needs not to be concealed */ |
| if (conceal_group_min == 0) |
| endBand = conceal_min; |
| else |
| endBand = pRvlc->maxSfbTransmitted; |
| for (group=0; group <= conceal_group_min; group++) { |
| for (band=0; band < endBand; band++) { |
| bnds = 16*group+band; |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| } |
| if ((group+1) == conceal_group_min) |
| endBand = conceal_min; |
| } |
| |
| startBand = conceal_max+1; |
| for (group=conceal_group_max; group < pRvlc->numWindowGroups; group++) { |
| for (band=startBand; band < pRvlc->maxSfbTransmitted; band++) { |
| bnds = 16*group+band; |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| } |
| startBand = 0; |
| } |
| } |
| |
| /*--------------------------------------------------------------------------------------------- |
| function: StatisticalEstimation |
| |
| description: This approach by means of statistical estimation is generally performed when |
| both the start value and the end value are different and no further errors have |
| been detected. Considering the forward and backward decoded scalefactors, the |
| set with the lower scalefactors in sum will be considered as the correct one. |
| The scalefactors are differentially encoded. Normally it would reach to compare |
| one pair of the forward and backward decoded scalefactors to specify the lower |
| set. But having detected no further errors does not necessarily mean the absence |
| of errors. Therefore all scalefactors decoded in forward and backward direction |
| are summed up seperately. The set with the lower sum will be used. The strategy |
| must be applied to scalefactors, intensity data and noise energy seperately. |
| ----------------------------------------------------------------------------------------------- |
| output: Concealed scalefactor, noise energy and intensity data |
| ----------------------------------------------------------------------------------------------- |
| return: - |
| -------------------------------------------------------------------------------------------- */ |
| |
| void StatisticalEstimation (CAacDecoderChannelInfo *pAacDecoderChannelInfo) |
| { |
| CErRvlcInfo *pRvlc = &pAacDecoderChannelInfo->pComData->overlay.aac.erRvlcInfo; |
| int band,bnds,group; |
| int sumIsFwd,sumIsBwd; /* sum of intensity data forward/backward */ |
| int sumNrgFwd,sumNrgBwd; /* sum of noise energy data forward/backward */ |
| int sumScfFwd,sumScfBwd; /* sum of scalefactor data forward/backward */ |
| int useIsFwd,useNrgFwd,useScfFwd; /* the flags signals the elements which are used for the final result */ |
| int MaximumScaleFactorBands; |
| |
| if (GetWindowSequence(&pAacDecoderChannelInfo->icsInfo) == EightShortSequence) |
| MaximumScaleFactorBands = 16; |
| else |
| MaximumScaleFactorBands = 64; |
| |
| sumIsFwd = sumIsBwd = sumNrgFwd = sumNrgBwd = sumScfFwd = sumScfBwd = 0; |
| useIsFwd = useNrgFwd = useScfFwd = 0; |
| |
| /* calculate sum of each group (scf,nrg,is) of forward and backward direction */ |
| for (group=0; group<pRvlc->numWindowGroups; group++) { |
| for (band=0; band < pRvlc->maxSfbTransmitted; band++) { |
| bnds = 16*group+band; |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| break; |
| |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| sumIsFwd += pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| sumIsBwd += pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| break; |
| |
| case NOISE_HCB: |
| sumNrgFwd += pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| sumNrgBwd += pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| break ; |
| |
| default: |
| sumScfFwd += pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| sumScfBwd += pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| break; |
| } |
| } |
| } |
| |
| /* find for each group (scf,nrg,is) the correct direction */ |
| if ( sumIsFwd < sumIsBwd ) |
| useIsFwd = 1; |
| |
| if ( sumNrgFwd < sumNrgBwd ) |
| useNrgFwd = 1; |
| |
| if ( sumScfFwd < sumScfBwd ) |
| useScfFwd = 1; |
| |
| /* conceal each group (scf,nrg,is) */ |
| for (group=0; group<pRvlc->numWindowGroups; group++) { |
| for (band=0; band < pRvlc->maxSfbTransmitted; band++) { |
| bnds = 16*group+band; |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| break; |
| |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| if (useIsFwd) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| break; |
| |
| case NOISE_HCB: |
| if (useNrgFwd) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| break ; |
| |
| default: |
| if (useScfFwd) |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds]; |
| else |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]; |
| break; |
| } |
| } |
| } |
| } |
| |
| |
| /*--------------------------------------------------------------------------------------------- |
| description: Approach by means of predictive interpolation |
| This approach by means of predictive estimation is generally performed when |
| the error cannot be isolated between 'conceal_min' and 'conceal_max', the |
| 'sf_concealment' flag is set and the previous frame has the same block type |
| as the current frame. Check for each scalefactorband if the same type of data |
| (scalefactor, internsity data, noise energies) is transmitted. If so use the |
| scalefactor (intensity data, noise energy) in the current frame. Otherwise set |
| the scalefactor (intensity data, noise energy) for this scalefactorband to zero. |
| ----------------------------------------------------------------------------------------------- |
| output: Concealed scalefactor, noise energy and intensity data |
| ----------------------------------------------------------------------------------------------- |
| return: - |
| -------------------------------------------------------------------------------------------- */ |
| |
| void PredictiveInterpolation ( |
| CAacDecoderChannelInfo *pAacDecoderChannelInfo, |
| CAacDecoderStaticChannelInfo *pAacDecoderStaticChannelInfo |
| ) |
| { |
| CErRvlcInfo *pRvlc = &pAacDecoderChannelInfo->pComData->overlay.aac.erRvlcInfo; |
| int band,bnds,group; |
| int MaximumScaleFactorBands; |
| int commonMin; |
| |
| if (GetWindowSequence(&pAacDecoderChannelInfo->icsInfo) == EightShortSequence) |
| MaximumScaleFactorBands = 16; |
| else |
| MaximumScaleFactorBands = 64; |
| |
| for (group=0; group<pRvlc->numWindowGroups; group++) { |
| for (band=0; band < pRvlc->maxSfbTransmitted; band++) { |
| bnds = 16*group+band; |
| switch (pAacDecoderChannelInfo->pDynData->aCodeBook[bnds]) { |
| case ZERO_HCB: |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = 0; |
| break; |
| |
| case INTENSITY_HCB: |
| case INTENSITY_HCB2: |
| if ( (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]==INTENSITY_HCB) || (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]==INTENSITY_HCB2) ) { |
| commonMin = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(commonMin, pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousScaleFactor[bnds]); |
| } |
| else { |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = -110; |
| } |
| break; |
| |
| case NOISE_HCB: |
| if ( pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]==NOISE_HCB ) { |
| commonMin = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(commonMin, pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousScaleFactor[bnds]); |
| } |
| else { |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = -110; |
| } |
| break; |
| |
| default: |
| if ( (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=ZERO_HCB) |
| && (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=NOISE_HCB) |
| && (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=INTENSITY_HCB) |
| && (pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousCodebook[bnds]!=INTENSITY_HCB2) ) { |
| commonMin = FDKmin(pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfFwd[bnds],pAacDecoderChannelInfo->pComData->overlay.aac.aRvlcScfBwd[bnds]); |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = FDKmin(commonMin, pAacDecoderStaticChannelInfo->concealmentInfo.aRvlcPreviousScaleFactor[bnds]); |
| } |
| else { |
| pAacDecoderChannelInfo->pDynData->aScaleFactor[bnds] = 0; |
| } |
| break; |
| } |
| } |
| } |
| } |
| |
