libMpegTPDec/src/tpdec_adif.cpp

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
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   5 © Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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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
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  16 of the MPEG specifications.
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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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  82 ----------------------------------------------------------------------------------------------------------- */
  83
  84 /*****************************  MPEG-4 AAC Decoder  **************************
  85
  86    Author(s):   Josef Hoepfl
  87    Description: ADIF reader
  88
  89 ******************************************************************************/
  90
  91 #include "tpdec_adif.h"
  92
  93
  94 #include "FDK_bitstream.h"
  95 #include "genericStds.h"
  96
  97 TRANSPORTDEC_ERROR adifRead_DecodeHeader(
  98         CAdifHeader          *pAdifHeader,
  99         CProgramConfig       *pPce,
 100         HANDLE_FDK_BITSTREAM  bs
 101         )
 102 {
 103   int i;
 104   TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
 105   UINT startAnchor = FDKgetValidBits(bs);
 106
 107   if ((INT)startAnchor < MIN_ADIF_HEADERLENGTH) {
 108     return (TRANSPORTDEC_NOT_ENOUGH_BITS);
 109   }
 110
 111   if (FDKreadBits(bs,8) != 'A') {
 112     return (TRANSPORTDEC_SYNC_ERROR);
 113   }
 114   if (FDKreadBits(bs,8) != 'D') {
 115     return (TRANSPORTDEC_SYNC_ERROR);
 116   }
 117   if (FDKreadBits(bs,8) != 'I') {
 118     return (TRANSPORTDEC_SYNC_ERROR);
 119   }
 120   if (FDKreadBits(bs,8) != 'F') {
 121     return (TRANSPORTDEC_SYNC_ERROR);
 122   }
 123
 124   if ( (pAdifHeader->CopyrightIdPresent = FDKreadBits(bs,1)) != 0 )
 125     FDKpushBiDirectional(bs,72);  /* CopyrightId */
 126
 127
 128   pAdifHeader->OriginalCopy = FDKreadBits(bs,1);
 129   pAdifHeader->Home = FDKreadBits(bs,1);
 130   pAdifHeader->BitstreamType = FDKreadBits(bs,1);
 131
 132   /* pAdifHeader->BitRate = FDKreadBits(bs, 23); */
 133   pAdifHeader->BitRate = FDKreadBits(bs,16);
 134   pAdifHeader->BitRate <<= 7;
 135   pAdifHeader->BitRate |= FDKreadBits(bs,7);
 136
 137   pAdifHeader->NumProgramConfigElements = FDKreadBits(bs,4) + 1;
 138
 139   if (pAdifHeader->BitstreamType == 0) {
 140     FDKpushBiDirectional(bs,20);  /* adif_buffer_fullness */
 141   }
 142
 143   /* Parse all PCEs but keep only one */
 144   for (i=0; i < pAdifHeader->NumProgramConfigElements; i++)
 145   {
 146     CProgramConfig_Read(pPce, bs, startAnchor);
 147   }
 148
 149   FDKbyteAlign(bs, startAnchor);
 150
 151   return (ErrorStatus);
 152 }
 153
 154
 155