1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16of the MPEG specifications. 17 18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20individually for the purpose of encoding or decoding bit streams in products that are compliant with 21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27applications information and documentation. 28 292. COPYRIGHT LICENSE 30 31Redistribution and use in source and binary forms, with or without modification, are permitted without 32payment of copyright license fees provided that you satisfy the following conditions: 33 34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35your modifications thereto in source code form. 36 37You must retain the complete text of this software license in the documentation and/or other materials 38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40modifications thereto to recipients of copies in binary form. 41 42The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43prior written permission. 44 45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46software or your modifications thereto. 47 48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49and the date of any change. For modified versions of the FDK AAC Codec, the term 50"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 51"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 52 533. NO PATENT LICENSE 54 55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57respect to this software. 58 59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60by appropriate patent licenses. 61 624. DISCLAIMER 63 64This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors 65"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties 66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69or business interruption, however caused and on any theory of liability, whether in contract, strict 70liability, or tort (including negligence), arising in any way out of the use of this software, even if 71advised of the possibility of such damage. 72 735. CONTACT INFORMATION 74 75Fraunhofer Institute for Integrated Circuits IIS 76Attention: Audio and Multimedia Departments - FDK AAC LL 77Am Wolfsmantel 33 7891058 Erlangen, Germany 79 80www.iis.fraunhofer.de/amm 81amm-info@iis.fraunhofer.de 82----------------------------------------------------------------------------------------------------------- */ 83 84/******************************** MPEG Audio Encoder ************************** 85 86 Initial author: M.Werner 87 contents/description: MS stereo processing 88 89******************************************************************************/ 90#include "ms_stereo.h" 91 92#include "psy_const.h" 93 94/* static const float scaleMinThres = 1.0f; */ /* 0.75f for 3db boost */ 95 96void FDKaacEnc_MsStereoProcessing(PSY_DATA *RESTRICT psyData[(2)], 97 PSY_OUT_CHANNEL* psyOutChannel[2], 98 const INT *isBook, 99 INT *msDigest, /* output */ 100 INT *msMask, /* output */ 101 const INT sfbCnt, 102 const INT sfbPerGroup, 103 const INT maxSfbPerGroup, 104 const INT *sfbOffset) 105{ 106 FIXP_DBL *sfbEnergyLeft = psyData[0]->sfbEnergy.Long; /* modified where msMask==1 */ 107 FIXP_DBL *sfbEnergyRight = psyData[1]->sfbEnergy.Long; /* modified where msMask==1 */ 108 const FIXP_DBL *sfbEnergyMid = psyData[0]->sfbEnergyMS.Long; 109 const FIXP_DBL *sfbEnergySide = psyData[1]->sfbEnergyMS.Long; 110 FIXP_DBL *sfbThresholdLeft = psyData[0]->sfbThreshold.Long; /* modified where msMask==1 */ 111 FIXP_DBL *sfbThresholdRight = psyData[1]->sfbThreshold.Long; /* modified where msMask==1 */ 112 113 FIXP_DBL *sfbSpreadEnLeft = psyData[0]->sfbSpreadEnergy.Long; 114 FIXP_DBL *sfbSpreadEnRight = psyData[1]->sfbSpreadEnergy.Long; 115 116 FIXP_DBL *sfbEnergyLeftLdData = psyOutChannel[0]->sfbEnergyLdData; /* modified where msMask==1 */ 117 FIXP_DBL *sfbEnergyRightLdData = psyOutChannel[1]->sfbEnergyLdData; /* modified where msMask==1 */ 118 FIXP_DBL *sfbEnergyMidLdData = psyData[0]->sfbEnergyMSLdData; 119 FIXP_DBL *sfbEnergySideLdData = psyData[1]->sfbEnergyMSLdData; 120 FIXP_DBL *sfbThresholdLeftLdData = psyOutChannel[0]->sfbThresholdLdData; /* modified where msMask==1 */ 121 FIXP_DBL *sfbThresholdRightLdData = psyOutChannel[1]->sfbThresholdLdData; /* modified where msMask==1 */ 122 123 FIXP_DBL *mdctSpectrumLeft = psyData[0]->mdctSpectrum; /* modified where msMask==1 */ 124 FIXP_DBL *mdctSpectrumRight = psyData[1]->mdctSpectrum; /* modified where msMask==1 */ 125 126 INT sfb,sfboffs, j; /* loop counters */ 127 FIXP_DBL pnlrLdData, pnmsLdData; 128 FIXP_DBL minThresholdLdData; 129 FIXP_DBL minThreshold; 130 INT useMS; 131 132 INT msMaskTrueSomewhere = 0; /* to determine msDigest */ 133 INT numMsMaskFalse = 0; /* number of non-intensity bands where L/R coding is used */ 134 135 for(sfb=0; sfb<sfbCnt; sfb+=sfbPerGroup) { 136 for(sfboffs=0;sfboffs<maxSfbPerGroup;sfboffs++) { 137 138 if ( (isBook==NULL) ? 1 : (isBook[sfb+sfboffs] == 0) ) { 139 FIXP_DBL tmp; 140 141/* 142 minThreshold=min(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs])*scaleMinThres; 143 pnlr = (sfbThresholdLeft[sfb+sfboffs]/ 144 max(sfbEnergyLeft[sfb+sfboffs],sfbThresholdLeft[sfb+sfboffs]))* 145 (sfbThresholdRight[sfb+sfboffs]/ 146 max(sfbEnergyRight[sfb+sfboffs],sfbThresholdRight[sfb+sfboffs])); 147 pnms = (minThreshold/max(sfbEnergyMid[sfb+sfboffs],minThreshold))* 148 (minThreshold/max(sfbEnergySide[sfb+sfboffs],minThreshold)); 149 useMS = (pnms > pnlr); 150*/ 151 152 /* we assume that scaleMinThres == 1.0f and we can drop it */ 153 minThresholdLdData = fixMin(sfbThresholdLeftLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); 154 155 /* pnlrLdData = sfbThresholdLeftLdData[sfb+sfboffs] - 156 max(sfbEnergyLeftLdData[sfb+sfboffs], sfbThresholdLeftLdData[sfb+sfboffs]) + 157 sfbThresholdRightLdData[sfb+sfboffs] - 158 max(sfbEnergyRightLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); */ 159 tmp = fixMax(sfbEnergyLeftLdData[sfb+sfboffs], sfbThresholdLeftLdData[sfb+sfboffs]); 160 pnlrLdData = (sfbThresholdLeftLdData[sfb+sfboffs]>>1) - (tmp>>1); 161 pnlrLdData = pnlrLdData + (sfbThresholdRightLdData[sfb+sfboffs]>>1); 162 tmp = fixMax(sfbEnergyRightLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); 163 pnlrLdData = pnlrLdData - (tmp>>1); 164 165 /* pnmsLdData = minThresholdLdData - max(sfbEnergyMidLdData[sfb+sfboffs], minThresholdLdData) + 166 minThresholdLdData - max(sfbEnergySideLdData[sfb+sfboffs], minThresholdLdData); */ 167 tmp = fixMax(sfbEnergyMidLdData[sfb+sfboffs], minThresholdLdData); 168 pnmsLdData = minThresholdLdData - (tmp>>1); 169 tmp = fixMax(sfbEnergySideLdData[sfb+sfboffs], minThresholdLdData); 170 pnmsLdData = pnmsLdData - (tmp>>1); 171 useMS = (pnmsLdData > (pnlrLdData)); 172 173 174 if (useMS) { 175 msMask[sfb+sfboffs] = 1; 176 msMaskTrueSomewhere = 1; 177 for(j=sfbOffset[sfb+sfboffs]; j<sfbOffset[sfb+sfboffs+1]; j++) { 178 FIXP_DBL specL, specR; 179 specL = mdctSpectrumLeft[j]>>1; 180 specR = mdctSpectrumRight[j]>>1; 181 mdctSpectrumLeft[j] = specL + specR; 182 mdctSpectrumRight[j] = specL - specR; 183 } 184 minThreshold = fixMin(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs]); 185 sfbThresholdLeft[sfb+sfboffs] = sfbThresholdRight[sfb+sfboffs] = minThreshold; 186 sfbThresholdLeftLdData[sfb+sfboffs] = sfbThresholdRightLdData[sfb+sfboffs] = minThresholdLdData; 187 sfbEnergyLeft[sfb+sfboffs] = sfbEnergyMid[sfb+sfboffs]; 188 sfbEnergyRight[sfb+sfboffs] = sfbEnergySide[sfb+sfboffs]; 189 sfbEnergyLeftLdData[sfb+sfboffs] = sfbEnergyMidLdData[sfb+sfboffs]; 190 sfbEnergyRightLdData[sfb+sfboffs] = sfbEnergySideLdData[sfb+sfboffs]; 191 192 sfbSpreadEnLeft[sfb+sfboffs] = sfbSpreadEnRight[sfb+sfboffs] = 193 fixMin( sfbSpreadEnLeft[sfb+sfboffs], 194 sfbSpreadEnRight[sfb+sfboffs] ) >> 1; 195 196 } 197 else { 198 msMask[sfb+sfboffs] = 0; 199 numMsMaskFalse++; 200 } /* useMS */ 201 } /* isBook */ 202 else { 203 /* keep mDigest from IS module */ 204 if (msMask[sfb+sfboffs]) { 205 msMaskTrueSomewhere = 1; 206 } 207 /* prohibit MS_MASK_ALL in combination with IS */ 208 numMsMaskFalse = 9; 209 } /* isBook */ 210 } /* sfboffs */ 211 } /* sfb */ 212 213 214 if(msMaskTrueSomewhere == 1) { 215 if ((numMsMaskFalse == 0) || ((numMsMaskFalse < maxSfbPerGroup) && (numMsMaskFalse < 9))) { 216 *msDigest = SI_MS_MASK_ALL; 217 /* loop through M/S bands; if msMask==0, set it to 1 and apply M/S */ 218 for (sfb = 0; sfb < sfbCnt; sfb += sfbPerGroup) { 219 for (sfboffs = 0; sfboffs < maxSfbPerGroup; sfboffs++) { 220 if (( (isBook == NULL) ? 1 : (isBook[sfb+sfboffs] == 0) ) && (msMask[sfb+sfboffs] == 0)) { 221 msMask[sfb+sfboffs] = 1; 222 /* apply M/S coding */ 223 for(j=sfbOffset[sfb+sfboffs]; j<sfbOffset[sfb+sfboffs+1]; j++) { 224 FIXP_DBL specL, specR; 225 specL = mdctSpectrumLeft[j]>>1; 226 specR = mdctSpectrumRight[j]>>1; 227 mdctSpectrumLeft[j] = specL + specR; 228 mdctSpectrumRight[j] = specL - specR; 229 } 230 minThreshold = fixMin(sfbThresholdLeft[sfb+sfboffs], sfbThresholdRight[sfb+sfboffs]); 231 sfbThresholdLeft[sfb+sfboffs] = sfbThresholdRight[sfb+sfboffs] = minThreshold; 232 minThresholdLdData = fixMin(sfbThresholdLeftLdData[sfb+sfboffs], sfbThresholdRightLdData[sfb+sfboffs]); 233 sfbThresholdLeftLdData[sfb+sfboffs] = sfbThresholdRightLdData[sfb+sfboffs] = minThresholdLdData; 234 sfbEnergyLeft[sfb+sfboffs] = sfbEnergyMid[sfb+sfboffs]; 235 sfbEnergyRight[sfb+sfboffs] = sfbEnergySide[sfb+sfboffs]; 236 sfbEnergyLeftLdData[sfb+sfboffs] = sfbEnergyMidLdData[sfb+sfboffs]; 237 sfbEnergyRightLdData[sfb+sfboffs] = sfbEnergySideLdData[sfb+sfboffs]; 238 239 sfbSpreadEnLeft[sfb+sfboffs] = sfbSpreadEnRight[sfb+sfboffs] = 240 fixMin( sfbSpreadEnLeft[sfb+sfboffs], 241 sfbSpreadEnRight[sfb+sfboffs] ) >> 1; 242 } 243 } 244 } 245 } else { 246 *msDigest = SI_MS_MASK_SOME; 247 } 248 } else { 249 *msDigest = SI_MS_MASK_NONE; 250 } 251} 252