| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2012 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 |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /******************************** MPEG Audio Encoder ************************** |
| |
| Initial author: M.Werner |
| contents/description: MS stereo processing |
| |
| ******************************************************************************/ |
| #include "ms_stereo.h" |
| |
| #include "psy_const.h" |
| |
| /* static const float scaleMinThres = 1.0f; */ /* 0.75f for 3db boost */ |
| |
| void FDKaacEnc_MsStereoProcessing(PSY_DATA *RESTRICT psyData[(2)], |
| PSY_OUT_CHANNEL* psyOutChannel[2], |
| const INT *isBook, |
| INT *msDigest, /* output */ |
| INT *msMask, /* output */ |
| const INT sfbCnt, |
| const INT sfbPerGroup, |
| const INT maxSfbPerGroup, |
| const INT *sfbOffset) |
| { |
| FIXP_DBL *sfbEnergyLeft = psyData[0]->sfbEnergy.Long; /* modified where msMask==1 */ |
| FIXP_DBL *sfbEnergyRight = psyData[1]->sfbEnergy.Long; /* modified where msMask==1 */ |
| const FIXP_DBL *sfbEnergyMid = psyData[0]->sfbEnergyMS.Long; |
| const FIXP_DBL *sfbEnergySide = psyData[1]->sfbEnergyMS.Long; |
| FIXP_DBL *sfbThresholdLeft = psyData[0]->sfbThreshold.Long; /* modified where msMask==1 */ |
| FIXP_DBL *sfbThresholdRight = psyData[1]->sfbThreshold.Long; /* modified where msMask==1 */ |
| |
| FIXP_DBL *sfbSpreadEnLeft = psyData[0]->sfbSpreadEnergy.Long; |
| FIXP_DBL *sfbSpreadEnRight = psyData[1]->sfbSpreadEnergy.Long; |
| |
| FIXP_DBL *sfbEnergyLeftLdData = psyOutChannel[0]->sfbEnergyLdData; /* modified where msMask==1 */ |
| FIXP_DBL *sfbEnergyRightLdData = psyOutChannel[1]->sfbEnergyLdData; /* modified where msMask==1 */ |
| FIXP_DBL *sfbEnergyMidLdData = psyData[0]->sfbEnergyMSLdData; |
| FIXP_DBL *sfbEnergySideLdData = psyData[1]->sfbEnergyMSLdData; |
| FIXP_DBL *sfbThresholdLeftLdData = psyOutChannel[0]->sfbThresholdLdData; /* modified where msMask==1 */ |
| FIXP_DBL *sfbThresholdRightLdData = psyOutChannel[1]->sfbThresholdLdData; /* modified where msMask==1 */ |
| |
| FIXP_DBL *mdctSpectrumLeft = psyData[0]->mdctSpectrum; /* modified where msMask==1 */ |
| FIXP_DBL *mdctSpectrumRight = psyData[1]->mdctSpectrum; /* modified where msMask==1 */ |
| |
| INT sfb,sfboffs, j; /* loop counters */ |
| FIXP_DBL pnlrLdData, pnmsLdData; |
| FIXP_DBL minThresholdLdData; |
| FIXP_DBL minThreshold; |
| INT useMS; |
| |
| INT msMaskTrueSomewhere = 0; /* to determine msDigest */ |
| INT numMsMaskFalse = 0; /* number of non-intensity bands where L/R coding is used */ |
| |
| for(sfb=0; sfb<sfbCnt; sfb+=sfbPerGroup) { |
| for(sfboffs=0;sfboffs<maxSfbPerGroup;sfboffs++) { |
| |
| if ( (isBook==NULL) ? 1 : (isBook[sfb+sfboffs] == 0) ) { |
| FIXP_DBL tmp; |
| |
| /* |
| minThreshold=min(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs])*scaleMinThres; |
| pnlr = (sfbThresholdLeft[sfb+sfboffs]/ |
| max(sfbEnergyLeft[sfb+sfboffs],sfbThresholdLeft[sfb+sfboffs]))* |
| (sfbThresholdRight[sfb+sfboffs]/ |
| max(sfbEnergyRight[sfb+sfboffs],sfbThresholdRight[sfb+sfboffs])); |
| pnms = (minThreshold/max(sfbEnergyMid[sfb+sfboffs],minThreshold))* |
| (minThreshold/max(sfbEnergySide[sfb+sfboffs],minThreshold)); |
| useMS = (pnms > pnlr); |
| */ |
| |
| /* we assume that scaleMinThres == 1.0f and we can drop it */ |
| minThresholdLdData = fixMin(sfbThresholdLeftLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); |
| |
| /* pnlrLdData = sfbThresholdLeftLdData[sfb+sfboffs] - |
| max(sfbEnergyLeftLdData[sfb+sfboffs], sfbThresholdLeftLdData[sfb+sfboffs]) + |
| sfbThresholdRightLdData[sfb+sfboffs] - |
| max(sfbEnergyRightLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); */ |
| tmp = fixMax(sfbEnergyLeftLdData[sfb+sfboffs], sfbThresholdLeftLdData[sfb+sfboffs]); |
| pnlrLdData = (sfbThresholdLeftLdData[sfb+sfboffs]>>1) - (tmp>>1); |
| pnlrLdData = pnlrLdData + (sfbThresholdRightLdData[sfb+sfboffs]>>1); |
| tmp = fixMax(sfbEnergyRightLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); |
| pnlrLdData = pnlrLdData - (tmp>>1); |
| |
| /* pnmsLdData = minThresholdLdData - max(sfbEnergyMidLdData[sfb+sfboffs], minThresholdLdData) + |
| minThresholdLdData - max(sfbEnergySideLdData[sfb+sfboffs], minThresholdLdData); */ |
| tmp = fixMax(sfbEnergyMidLdData[sfb+sfboffs], minThresholdLdData); |
| pnmsLdData = minThresholdLdData - (tmp>>1); |
| tmp = fixMax(sfbEnergySideLdData[sfb+sfboffs], minThresholdLdData); |
| pnmsLdData = pnmsLdData - (tmp>>1); |
| useMS = (pnmsLdData > (pnlrLdData)); |
| |
| |
| if (useMS) { |
| msMask[sfb+sfboffs] = 1; |
| msMaskTrueSomewhere = 1; |
| for(j=sfbOffset[sfb+sfboffs]; j<sfbOffset[sfb+sfboffs+1]; j++) { |
| FIXP_DBL specL, specR; |
| specL = mdctSpectrumLeft[j]>>1; |
| specR = mdctSpectrumRight[j]>>1; |
| mdctSpectrumLeft[j] = specL + specR; |
| mdctSpectrumRight[j] = specL - specR; |
| } |
| minThreshold = fixMin(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs]); |
| sfbThresholdLeft[sfb+sfboffs] = sfbThresholdRight[sfb+sfboffs] = minThreshold; |
| sfbThresholdLeftLdData[sfb+sfboffs] = sfbThresholdRightLdData[sfb+sfboffs] = minThresholdLdData; |
| sfbEnergyLeft[sfb+sfboffs] = sfbEnergyMid[sfb+sfboffs]; |
| sfbEnergyRight[sfb+sfboffs] = sfbEnergySide[sfb+sfboffs]; |
| sfbEnergyLeftLdData[sfb+sfboffs] = sfbEnergyMidLdData[sfb+sfboffs]; |
| sfbEnergyRightLdData[sfb+sfboffs] = sfbEnergySideLdData[sfb+sfboffs]; |
| |
| sfbSpreadEnLeft[sfb+sfboffs] = sfbSpreadEnRight[sfb+sfboffs] = |
| fixMin( sfbSpreadEnLeft[sfb+sfboffs], |
| sfbSpreadEnRight[sfb+sfboffs] ) >> 1; |
| |
| } |
| else { |
| msMask[sfb+sfboffs] = 0; |
| numMsMaskFalse++; |
| } /* useMS */ |
| } /* isBook */ |
| else { |
| /* keep mDigest from IS module */ |
| if (msMask[sfb+sfboffs]) { |
| msMaskTrueSomewhere = 1; |
| } |
| /* prohibit MS_MASK_ALL in combination with IS */ |
| numMsMaskFalse = 9; |
| } /* isBook */ |
| } /* sfboffs */ |
| } /* sfb */ |
| |
| |
| if(msMaskTrueSomewhere == 1) { |
| if ((numMsMaskFalse == 0) || ((numMsMaskFalse < maxSfbPerGroup) && (numMsMaskFalse < 9))) { |
| *msDigest = SI_MS_MASK_ALL; |
| /* loop through M/S bands; if msMask==0, set it to 1 and apply M/S */ |
| for (sfb = 0; sfb < sfbCnt; sfb += sfbPerGroup) { |
| for (sfboffs = 0; sfboffs < maxSfbPerGroup; sfboffs++) { |
| if (( (isBook == NULL) ? 1 : (isBook[sfb+sfboffs] == 0) ) && (msMask[sfb+sfboffs] == 0)) { |
| msMask[sfb+sfboffs] = 1; |
| /* apply M/S coding */ |
| for(j=sfbOffset[sfb+sfboffs]; j<sfbOffset[sfb+sfboffs+1]; j++) { |
| FIXP_DBL specL, specR; |
| specL = mdctSpectrumLeft[j]>>1; |
| specR = mdctSpectrumRight[j]>>1; |
| mdctSpectrumLeft[j] = specL + specR; |
| mdctSpectrumRight[j] = specL - specR; |
| } |
| minThreshold = fixMin(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs]); |
| sfbThresholdLeft[sfb+sfboffs] = sfbThresholdRight[sfb+sfboffs] = minThreshold; |
| minThresholdLdData = fixMin(sfbThresholdLeftLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); |
| sfbThresholdLeftLdData[sfb+sfboffs] = sfbThresholdRightLdData[sfb+sfboffs] = minThresholdLdData; |
| sfbEnergyLeft[sfb+sfboffs] = sfbEnergyMid[sfb+sfboffs]; |
| sfbEnergyRight[sfb+sfboffs] = sfbEnergySide[sfb+sfboffs]; |
| sfbEnergyLeftLdData[sfb+sfboffs] = sfbEnergyMidLdData[sfb+sfboffs]; |
| sfbEnergyRightLdData[sfb+sfboffs] = sfbEnergySideLdData[sfb+sfboffs]; |
| |
| sfbSpreadEnLeft[sfb+sfboffs] = sfbSpreadEnRight[sfb+sfboffs] = |
| fixMin( sfbSpreadEnLeft[sfb+sfboffs], |
| sfbSpreadEnRight[sfb+sfboffs] ) >> 1; |
| } |
| } |
| } |
| } else { |
| *msDigest = SI_MS_MASK_SOME; |
| } |
| } else { |
| *msDigest = SI_MS_MASK_NONE; |
| } |
| } |
