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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Frderung 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 (at) iis.fraunhofer.de
     82 ----------------------------------------------------------------------------------------------------------- */
     83 
     84 /*****************************  MPEG-4 AAC Decoder  **************************
     85 
     86    Author(s):   Josef Hoepfl
     87    Description: ADTS interface
     88 
     89 ******************************************************************************/
     90 
     91 #ifndef TPDEC_ADTS_H
     92 #define TPDEC_ADTS_H
     93 
     94 #include "tpdec_lib.h"
     95 
     96 
     97 #define ADTS_SYNCWORD               ( 0xfff )
     98 #define ADTS_SYNCLENGTH             ( 12 )     /* in bits */
     99 #define ADTS_HEADERLENGTH           ( 56 )     /* minimum header size in bits */
    100 #define ADTS_FIXED_HEADERLENGTH     ( 28 )     /* in bits */
    101 #define ADTS_VARIABLE_HEADERLENGTH  ( ADTS_HEADERLENGTH - ADTS_FIXED_HEADERLENGTH )
    102 
    103 #ifdef CHECK_TWO_SYNCS
    104  #define ADTS_MIN_TP_BUF_SIZE       ( 8191 + 2 )
    105 #else
    106  #define ADTS_MIN_TP_BUF_SIZE       ( 8191 )
    107 #endif
    108 
    109 #include "FDK_crc.h"
    110 
    111 typedef struct {
    112   /* ADTS header fields */
    113   UCHAR mpeg_id;
    114   UCHAR layer;
    115   UCHAR protection_absent;
    116   UCHAR profile;
    117   UCHAR sample_freq_index;
    118   UCHAR private_bit;
    119   UCHAR channel_config;
    120   UCHAR original;
    121   UCHAR home;
    122   UCHAR copyright_id;
    123   UCHAR copyright_start;
    124   USHORT frame_length;
    125   USHORT adts_fullness;
    126   UCHAR num_raw_blocks;
    127   UCHAR num_pce_bits;
    128 } STRUCT_ADTS_BS;
    129 
    130 struct STRUCT_ADTS {
    131 
    132   STRUCT_ADTS_BS bs;
    133 
    134   UCHAR decoderCanDoMpeg4;
    135   UCHAR BufferFullnesStartFlag;
    136 
    137   FDK_CRCINFO crcInfo;             /* CRC state info */
    138   USHORT      crcReadValue;        /* CRC value read from bitstream data */
    139   USHORT      rawDataBlockDist[4]; /* distance between each raw data block. Not the same as found in the bitstream */
    140 } ;
    141 
    142 typedef struct STRUCT_ADTS *HANDLE_ADTS;
    143 
    144 /*!
    145   \brief Initialize ADTS CRC
    146 
    147   The function initialzes the crc buffer and the crc lookup table.
    148 
    149   \return  none
    150 */
    151 void adtsRead_CrcInit( HANDLE_ADTS pAdts );
    152 
    153 /**
    154  * \brief Starts CRC region with a maximum number of bits
    155  *        If mBits is positive zero padding will be used for CRC calculation, if there
    156  *        are less than mBits bits available.
    157  *        If mBits is negative no zero padding is done.
    158  *        If mBits is zero the memory for the buffer is allocated dynamically, the
    159  *        number of bits is not limited.
    160  *
    161  * \param pAdts ADTS data handle
    162  * \param hBs bitstream handle, on which the CRC region referes to
    163  * \param mBits max number of bits in crc region to be considered
    164  *
    165  * \return  ID for the created region, -1 in case of an error
    166  */
    167 int adtsRead_CrcStartReg(
    168         HANDLE_ADTS pAdts,
    169         HANDLE_FDK_BITSTREAM hBs,
    170         int mBits
    171         );
    172 
    173 /**
    174  * \brief Ends CRC region identified by reg
    175  *
    176  * \param pAdts ADTS data handle
    177  * \param hBs bitstream handle, on which the CRC region referes to
    178  * \param reg CRC regions ID returned by adtsRead_CrcStartReg()
    179  *
    180  * \return  none
    181  */
    182 void adtsRead_CrcEndReg(
    183         HANDLE_ADTS pAdts,
    184         HANDLE_FDK_BITSTREAM hBs,
    185         int reg
    186         );
    187 
    188 /**
    189  * \brief Check CRC
    190  *
    191  * Checks if the currently calculated CRC matches the CRC field read from the bitstream
    192  * Deletes all CRC regions.
    193  *
    194  * \param pAdts ADTS data handle
    195  *
    196  * \return Returns 0 if they are identical otherwise 1
    197  */
    198 TRANSPORTDEC_ERROR adtsRead_CrcCheck( HANDLE_ADTS pAdts );
    199 
    200 
    201 /**
    202  * \brief Check if we have a valid ADTS frame at the current bitbuffer position
    203  *
    204  * This function assumes enough bits in buffer for the current frame.
    205  * It reads out the header bits to prepare the bitbuffer for the decode loop.
    206  * In case the header bits show an invalid bitstream/frame, the whole frame is skipped.
    207  *
    208  * \param pAdts ADTS data handle which is filled with parsed ADTS header data
    209  * \param bs handle of bitstream from whom the ADTS header is read
    210  *
    211  * \return  error status
    212  */
    213 TRANSPORTDEC_ERROR adtsRead_DecodeHeader(
    214         HANDLE_ADTS           pAdts,
    215         CSAudioSpecificConfig *pAsc,
    216         HANDLE_FDK_BITSTREAM  bs,
    217         const INT             ignoreBufferFullness
    218         );
    219 
    220 /**
    221  * \brief Get the raw data block length of the given block number.
    222  *
    223  * \param pAdts ADTS data handle
    224  * \param blockNum current raw data block index
    225  * \param pLength pointer to an INT where the length of the given raw data block is stored into
    226  *                the returned value might be -1, in which case the raw data block length is unknown.
    227  *
    228  * \return  error status
    229  */
    230 int adtsRead_GetRawDataBlockLength(
    231         HANDLE_ADTS pAdts,
    232         INT         blockNum
    233         );
    234 
    235 
    236 #endif /* TPDEC_ADTS_H */
    237