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-
-/* -----------------------------------------------------------------------------------------------------------
-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
------------------------------------------------------------------------------------------------------------ */
-
-/******************************** 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;
- }
-}