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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2012 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):   Robert Weidner (DSP Solutions)
     87    Description: HCR Decoder: Defines of state-constants, masks and
     88                 state-prototypes
     89 
     90 *******************************************************************************/
     91 
     92 #ifndef _AACDEC_HCRS_H_
     93 #define _AACDEC_HCRS_H_
     94 
     95 
     96 
     97 #include "FDK_bitstream.h"
     98 #include "aacdec_hcr_types.h"
     99                                                     /* The four different kinds of types of states are:                     */
    100 /* different states are defined as constants */     /* start   middle=self   next   stop                                    */
    101 #define  STOP_THIS_STATE             0              /*                                                                      */
    102 #define  BODY_ONLY                   1              /*   X          X                X                                      */
    103 #define  BODY_SIGN__BODY             2              /*   X          X         X      X [stop if no sign]                    */
    104 #define  BODY_SIGN__SIGN             3              /*              X                X [stop if sign bits decoded]          */
    105 #define  BODY_SIGN_ESC__BODY         4              /*   X          X         X      X [stop if no sign]                    */
    106 #define  BODY_SIGN_ESC__SIGN         5              /*              X         X      X [stop if no escape sequence]         */
    107 #define  BODY_SIGN_ESC__ESC_PREFIX   6              /*              X         X                                             */
    108 #define  BODY_SIGN_ESC__ESC_WORD     7              /*              X         X      X [stop if abs(second qsc) != 16]      */
    109 
    110 /* examples: */
    111 
    112 /* BODY_ONLY                    means only the codeword body will be decoded; no sign bits will follow and no escapesequence will follow */
    113 
    114 /* BODY_SIGN__BODY              means that the codeword consists of two parts; body and sign part. The part '__BODY' after the two underscores shows */
    115 /*                              that the bits which are currently decoded belong to the '__BODY' of the codeword and not to the sign part. */
    116 
    117 /* BODY_SIGN_ESC__ESC_PB        means that the codeword consists of three parts; body, sign and (here: two) escape sequences;  */
    118 /*                              P = Prefix = ones */
    119 /*                              W = Escape Word */
    120 /*                              A = first possible (of two) Escape sequeces */
    121 /*                              B = second possible (of two) Escape sequeces */
    122 /*                              The part after the two underscores shows that the current bits which are decoded belong to the '__ESC_PB' - part of the */
    123 /*                              codeword. That means the body and the sign bits are decoded completely and the bits which are decoded now belong to */
    124 /*                              the escape sequence [P = prefix; B=second possible escape sequence] */
    125 
    126 
    127 #define   MSB_31_MASK                       0x80000000              /* masks MSB (= Bit 31) in a 32 bit word */
    128 #define   DIMENSION_OF_ESCAPE_CODEBOOK      2                       /* for cb >= 11 is dimension 2 */
    129 #define   ESCAPE_CODEBOOK                   11
    130 
    131 #define   MASK_ESCAPE_PREFIX_UP             0x000F0000
    132 #define   LSB_ESCAPE_PREFIX_UP              16
    133 
    134 #define   MASK_ESCAPE_PREFIX_DOWN           0x0000F000
    135 #define   LSB_ESCAPE_PREFIX_DOWN            12
    136 
    137 #define   MASK_ESCAPE_WORD                  0x00000FFF
    138 #define   MASK_FLAG_A                       0x00200000
    139 #define   MASK_FLAG_B                       0x00100000
    140 
    141 
    142 extern void DecodeNonPCWs(HANDLE_FDK_BITSTREAM bs, H_HCR_INFO hHcr);
    143 
    144 UINT Hcr_State_BODY_ONLY                 (HANDLE_FDK_BITSTREAM, void*);
    145 UINT Hcr_State_BODY_SIGN__BODY           (HANDLE_FDK_BITSTREAM, void*);
    146 UINT Hcr_State_BODY_SIGN__SIGN           (HANDLE_FDK_BITSTREAM, void*);
    147 UINT Hcr_State_BODY_SIGN_ESC__BODY       (HANDLE_FDK_BITSTREAM, void*);
    148 UINT Hcr_State_BODY_SIGN_ESC__SIGN       (HANDLE_FDK_BITSTREAM, void*);
    149 UINT Hcr_State_BODY_SIGN_ESC__ESC_PREFIX (HANDLE_FDK_BITSTREAM, void*);
    150 UINT Hcr_State_BODY_SIGN_ESC__ESC_WORD   (HANDLE_FDK_BITSTREAM, void*);
    151 
    152 #endif /* _AACDEC_HCRS_H_ */
    153 
    154