libAACenc/src/psy_data.h

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
   4
   5 © Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
   6   All rights reserved.
   7
   8  1.    INTRODUCTION
   9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
  10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
  11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
  12
  13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
  14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
  15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
  16 of the MPEG specifications.
  17
  18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
  19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
  20 individually for the purpose of encoding or decoding bit streams in products that are compliant with
  21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
  22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
  23 software may already be covered under those patent licenses when it is used for those licensed purposes only.
  24
  25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
  26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
  27 applications information and documentation.
  28
  29 2.    COPYRIGHT LICENSE
  30
  31 Redistribution and use in source and binary forms, with or without modification, are permitted without
  32 payment of copyright license fees provided that you satisfy the following conditions:
  33
  34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
  35 your modifications thereto in source code form.
  36
  37 You must retain the complete text of this software license in the documentation and/or other materials
  38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
  39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
  40 modifications thereto to recipients of copies in binary form.
  41
  42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
  43 prior written permission.
  44
  45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
  46 software or your modifications thereto.
  47
  48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
  49 and 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
  53 3.    NO PATENT LICENSE
  54
  55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
  56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
  57 respect to this software.
  58
  59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
  60 by appropriate patent licenses.
  61
  62 4.    DISCLAIMER
  63
  64 This 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
  66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
  67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
  68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
  69 or business interruption, however caused and on any theory of liability, whether in contract, strict
  70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
  71 advised of the possibility of such damage.
  72
  73 5.    CONTACT INFORMATION
  74
  75 Fraunhofer Institute for Integrated Circuits IIS
  76 Attention: Audio and Multimedia Departments - FDK AAC LL
  77 Am Wolfsmantel 33
  78 91058 Erlangen, Germany
  79
  80 www.iis.fraunhofer.de/amm
  81 amm-info@iis.fraunhofer.de
  82 ----------------------------------------------------------------------------------------------------------- */
  83
  84 /******************************** MPEG Audio Encoder **************************
  85
  86    Initial author:       M.Werner
  87    contents/description: Psychoaccoustic data
  88
  89 ******************************************************************************/
  90
  91 #ifndef _PSY_DATA_H
  92 #define _PSY_DATA_H
  93
  94
  95 #include "block_switch.h"
  96
  97 /* Be careful with MAX_SFB_LONG as length of the .Long arrays.
  98  * sfbEnergy.Long and sfbEnergyMS.Long and sfbThreshold.Long are used as a temporary storage for the regrouped
  99  * short energies and thresholds between FDKaacEnc_groupShortData() and BuildInterface() in FDKaacEnc_psyMain().
 100  * The space required for this is MAX_GROUPED_SFB ( = MAX_NO_OF_GROUPS*MAX_SFB_SHORT ).
 101  * However, this is not important if unions are used (which is not possible with pfloat). */
 102
 103 typedef shouldBeUnion{
 104   FIXP_DBL  Long[MAX_GROUPED_SFB];
 105   FIXP_DBL  Short[TRANS_FAC][MAX_SFB_SHORT];
 106 }SFB_THRESHOLD;
 107
 108 typedef shouldBeUnion{
 109   FIXP_DBL  Long[MAX_GROUPED_SFB];
 110   FIXP_DBL  Short[TRANS_FAC][MAX_SFB_SHORT];
 111 }SFB_ENERGY;
 112
 113 typedef shouldBeUnion{
 114   FIXP_DBL  Long[MAX_GROUPED_SFB];
 115   FIXP_DBL  Short[TRANS_FAC][MAX_SFB_SHORT];
 116 }SFB_LD_ENERGY;
 117
 118 typedef shouldBeUnion{
 119   INT  Long[MAX_GROUPED_SFB];
 120   INT  Short[TRANS_FAC][MAX_SFB_SHORT];
 121 }SFB_MAX_SCALE;
 122
 123
 124 typedef struct{
 125   INT_PCM*                  psyInputBuffer;
 126   FIXP_DBL                  overlapAddBuffer[1024];
 127
 128   BLOCK_SWITCHING_CONTROL   blockSwitchingControl;              /* block switching */
 129   FIXP_DBL                  sfbThresholdnm1[MAX_SFB];           /* FDKaacEnc_PreEchoControl */
 130   INT                       mdctScalenm1;                       /* scale of last block's mdct (FDKaacEnc_PreEchoControl) */
 131   INT                       calcPreEcho;
 132   INT                       isLFE;
 133 }PSY_STATIC;
 134
 135
 136 typedef struct{
 137   FIXP_DBL                 *mdctSpectrum;
 138   SFB_THRESHOLD             sfbThreshold;                       /* adapt                                  */
 139   SFB_ENERGY                sfbEnergy;                          /* sfb energies                           */
 140   SFB_LD_ENERGY             sfbEnergyLdData;                    /* sfb energies in ldData format          */
 141   SFB_MAX_SCALE             sfbMaxScaleSpec;
 142   SFB_ENERGY                sfbEnergyMS;                        /* mid/side sfb energies                  */
 143   FIXP_DBL                  sfbEnergyMSLdData[MAX_GROUPED_SFB]; /* mid/side sfb energies in ldData format */
 144   SFB_ENERGY                sfbSpreadEnergy;
 145   INT                       mdctScale;                          /* exponent of data in mdctSpectrum       */
 146   INT                       groupedSfbOffset[MAX_GROUPED_SFB+1];
 147   INT                       sfbActive;
 148   INT                       lowpassLine;
 149 }PSY_DATA;
 150
 151
 152 #endif /* _PSY_DATA_H */