libMpegTPEnc/src/tpenc_adif.cpp

   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.
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   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)
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  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.
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  64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
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  73 5.    CONTACT INFORMATION
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  75 Fraunhofer Institute for Integrated Circuits IIS
  76 Attention: Audio and Multimedia Departments - FDK AAC LL
  77 Am Wolfsmantel 33
  78 91058 Erlangen, Germany
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  81 amm-info@iis.fraunhofer.de
  82 ----------------------------------------------------------------------------------------------------------- */
  83
  84 /******************************** MPEG Audio Encoder **************************
  85
  86    contents/description: ADIF Transport Headers writing
  87
  88 ******************************************************************************/
  89
  90 #include "tpenc_adif.h"
  91
  92 #include "tpenc_lib.h"
  93 #include "tpenc_asc.h"
  94
  95
  96
  97 int adifWrite_EncodeHeader(ADIF_INFO *adif,
  98                                  HANDLE_FDK_BITSTREAM hBs,
  99                                  INT adif_buffer_fullness)
 100 {
 101   /* ADIF/PCE/ADTS definitions */
 102   const char adifId[5]="ADIF";
 103   const int  copyRightIdPresent=0;
 104   const int  originalCopy=0;
 105   const int  home=0;
 106
 107   int i;
 108
 109   INT sampleRate = adif->samplingRate;
 110   INT totalBitRate = adif->bitRate;
 111
 112   if (adif->headerWritten)
 113     return 0;
 114
 115   /* Align inside PCE with respect to the first bit of the header */
 116   UINT alignAnchor = FDKgetValidBits(hBs);
 117
 118   /* Signal variable bitrate if buffer fullnes exceeds 20 bit */
 119   adif->bVariableRate = ( adif_buffer_fullness >= (INT)(0x1<<20) ) ? 1 : 0;
 120
 121   FDKwriteBits(hBs, adifId[0],8);
 122   FDKwriteBits(hBs, adifId[1],8);
 123   FDKwriteBits(hBs, adifId[2],8);
 124   FDKwriteBits(hBs, adifId[3],8);
 125
 126
 127   FDKwriteBits(hBs, copyRightIdPresent ? 1:0,1);
 128
 129   if(copyRightIdPresent) {
 130     for(i=0;i<72;i++) {
 131       FDKwriteBits(hBs,0,1);
 132     }
 133   }
 134   FDKwriteBits(hBs, originalCopy ? 1:0,1);
 135   FDKwriteBits(hBs, home ? 1:0,1);
 136   FDKwriteBits(hBs, adif->bVariableRate?1:0, 1);
 137   FDKwriteBits(hBs, totalBitRate,23);
 138
 139   /* we write only one PCE at the moment */
 140   FDKwriteBits(hBs, 0, 4);
 141
 142   if(!adif->bVariableRate) {
 143     FDKwriteBits(hBs, adif_buffer_fullness, 20);
 144   }
 145
 146   /* Write PCE */
 147   transportEnc_writePCE(hBs, adif->cm, sampleRate, adif->instanceTag, adif->profile, 0, 0, alignAnchor);
 148
 149   return 0;
 150 }
 151
 152 int adifWrite_GetHeaderBits(ADIF_INFO *adif)
 153 {
 154   /* ADIF definitions */
 155   const int  copyRightIdPresent=0;
 156
 157   if (adif->headerWritten)
 158     return 0;
 159
 160   int bits = 0;
 161
 162   bits += 8*4; /* ADIF ID */
 163
 164   bits += 1; /* Copyright present */
 165
 166   if (copyRightIdPresent)
 167     bits += 72;          /* Copyright ID */
 168
 169   bits += 26;
 170
 171   bits += 4; /* Number of PCE's */
 172
 173   if(!adif->bVariableRate) {
 174     bits += 20;
 175   }
 176
 177   /* write PCE */
 178   bits = transportEnc_GetPCEBits(adif->cm, 0, bits);
 179
 180   return bits;
 181 }
 182