xref: /aosp_15_r20/external/aac/libArithCoding/src/ac_arith_coder.cpp (revision e54365361535b070c2db7374cec45c159c7d0e7a)

/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

© Copyright  1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.

 1.    INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
scheme for digital audio. This FDK AAC Codec software is intended to be used on
a wide variety of Android devices.

AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
general perceptual audio codecs. AAC-ELD is considered the best-performing
full-bandwidth communications codec by independent studies and is widely
deployed. AAC has been standardized by ISO and IEC as part of the MPEG
specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including
those of Fraunhofer) may be obtained through Via Licensing
(www.vialicensing.com) or through the respective patent owners individually for
the purpose of encoding or decoding bit streams in products that are compliant
with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
Android devices already license these patent claims through Via Licensing or
directly from the patent owners, and therefore FDK AAC Codec software may
already be covered under those patent licenses when it is used for those
licensed purposes only.

Commercially-licensed AAC software libraries, including floating-point versions
with enhanced sound quality, are also available from Fraunhofer. Users are
encouraged to check the Fraunhofer website for additional applications
information and documentation.

2.    COPYRIGHT LICENSE

Redistribution and use in source and binary forms, with or without modification,
are permitted without payment of copyright license fees provided that you
satisfy the following conditions:

You must retain the complete text of this software license in redistributions of
the FDK AAC Codec or your modifications thereto in source code form.

You must retain the complete text of this software license in the documentation
and/or other materials provided with redistributions of the FDK AAC Codec or
your modifications thereto in binary form. You must make available free of
charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.

The name of Fraunhofer may not be used to endorse or promote products derived
from this library without prior written permission.

You may not charge copyright license fees for anyone to use, copy or distribute
the FDK AAC Codec software or your modifications thereto.

Your modified versions of the FDK AAC Codec must carry prominent notices stating
that you changed the software and the date of any change. For modified versions
of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
AAC Codec Library for Android."

3.    NO PATENT LICENSE

NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
Fraunhofer provides no warranty of patent non-infringement with respect to this
software.

You may use this FDK AAC Codec software or modifications thereto only for
purposes that are authorized by appropriate patent licenses.

4.    DISCLAIMER

This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
including but not limited to the implied warranties of merchantability and
fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
or consequential damages, including but not limited to procurement of substitute
goods or services; loss of use, data, or profits, or business interruption,
however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of
this software, even if advised of the possibility of such damage.

5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
[email protected]
----------------------------------------------------------------------------- */

/************************** Arithmetic coder library ***************************

   Author(s):   Youliy Ninov, Oliver Weiss

   Description: Definition of Spectral Noiseless Coding Scheme based on an
                Arithmetic Coder in Conjunction with an Adaptive Context

*******************************************************************************/

#include "ac_arith_coder.h"

#define cbitsnew 16
#define stat_bitsnew 14
#define ari_q4new (((long)1 << cbitsnew) - 1) /* 0xFFFF */
#define ari_q1new (ari_q4new / 4 + 1)         /* 0x4000 */
#define ari_q2new (2 * ari_q1new)             /* 0x8000 */
#define ari_q3new (3 * ari_q1new)             /* 0xC000 */

#define VAL_ESC 16

/* Arithmetic coder library info */
#define AC_LIB_VL0 2
#define AC_LIB_VL1 0
#define AC_LIB_VL2 0
#define AC_LIB_TITLE "Arithmetic Coder Lib"
#ifdef __ANDROID__
#define AC_LIB_BUILD_DATE ""
#define AC_LIB_BUILD_TIME ""
#else
#define AC_LIB_BUILD_DATE __DATE__
#define AC_LIB_BUILD_TIME __TIME__
#endif

const SHORT ari_lsb2[3][4] = {
    {12571, 10569, 3696, 0}, {12661, 5700, 3751, 0}, {10827, 6884, 2929, 0}};

H_ALLOC_MEM(ArcoData, CArcoData)
/*! The structure ArcoData contains 2-tuple context of previous frame. <br>
    Dimension: 1 */
C_ALLOC_MEM(ArcoData, CArcoData, 1)

/*
   This define triggers the use of the pre-known return values of function
   get_pk_v2() for the cases, where parameter s is in range
   0x00000000..0x0000000F. Note: These 16 bytes have been moved into the first 4
   entries of ari_merged_hash_ps that are no more referenced.
*/

static const ULONG ari_merged_hash_ps[742] = {
    0x00001044UL, 0x00003D0AUL, 0x00005350UL, 0x000074D6UL, 0x0000A49FUL,
    0x0000F96EUL, 0x00111000UL, 0x01111E83UL, 0x01113146UL, 0x01114036UL,
    0x01116863UL, 0x011194E9UL, 0x0111F7EEUL, 0x0112269BUL, 0x01124775UL,
    0x01126DA1UL, 0x0112D912UL, 0x01131AF0UL, 0x011336DDUL, 0x01135CF5UL,
    0x01139DF8UL, 0x01141A5BUL, 0x01144773UL, 0x01146CF5UL, 0x0114FDE9UL,
    0x01166CF5UL, 0x0116FDE4UL, 0x01174CF3UL, 0x011FFDCFUL, 0x01211CC2UL,
    0x01213B2DUL, 0x01214036UL, 0x01216863UL, 0x012194D2UL, 0x0122197FUL,
    0x01223AADUL, 0x01224036UL, 0x01226878UL, 0x0122A929UL, 0x0122F4ABUL,
    0x01232B2DUL, 0x012347B6UL, 0x01237DF8UL, 0x0123B929UL, 0x012417DDUL,
    0x01245D76UL, 0x01249DF8UL, 0x0124F912UL, 0x01255D75UL, 0x0125FDE9UL,
    0x01265D75UL, 0x012B8DF7UL, 0x01311E2AUL, 0x01313B5EUL, 0x0131687BUL,
    0x01321A6DUL, 0x013237BCUL, 0x01326863UL, 0x0132F4EEUL, 0x01332B5EUL,
    0x01335DA1UL, 0x01338E24UL, 0x01341A5EUL, 0x01343DB6UL, 0x01348DF8UL,
    0x01351935UL, 0x01355DB7UL, 0x0135FE12UL, 0x01376DF7UL, 0x013FFE29UL,
    0x01400024UL, 0x01423821UL, 0x014318F6UL, 0x01433821UL, 0x0143F8E5UL,
    0x01443DA1UL, 0x01486E38UL, 0x014FF929UL, 0x01543EE3UL, 0x015FF912UL,
    0x016F298CUL, 0x018A5A69UL, 0x021007F1UL, 0x02112C2CUL, 0x02114B48UL,
    0x02117353UL, 0x0211F4AEUL, 0x02122FEAUL, 0x02124B48UL, 0x02127850UL,
    0x0212F72EUL, 0x02133A9EUL, 0x02134036UL, 0x02138864UL, 0x021414ADUL,
    0x0214379EUL, 0x02145DB6UL, 0x0214FE1FUL, 0x02166DB7UL, 0x02200DC4UL,
    0x02212FEAUL, 0x022147A0UL, 0x02218369UL, 0x0221F7EEUL, 0x02222AADUL,
    0x02224788UL, 0x02226863UL, 0x02229929UL, 0x0222F4ABUL, 0x02232A9EUL,
    0x02234F08UL, 0x02237864UL, 0x0223A929UL, 0x022417DEUL, 0x02244F36UL,
    0x02248863UL, 0x02251A74UL, 0x02256DA1UL, 0x0225FE12UL, 0x02263DB6UL,
    0x02276DF7UL, 0x022FFE29UL, 0x0231186DUL, 0x023137BCUL, 0x02314020UL,
    0x02319ED6UL, 0x0232196DUL, 0x023237BCUL, 0x02325809UL, 0x02329429UL,
    0x023317EDUL, 0x02333F08UL, 0x02335809UL, 0x023378E4UL, 0x02341A7CUL,
    0x02344221UL, 0x0234A8D3UL, 0x023514BCUL, 0x02354221UL, 0x0235F8DFUL,
    0x02364861UL, 0x023FFE29UL, 0x02400024UL, 0x0241583BUL, 0x024214C8UL,
    0x02424809UL, 0x02427EE6UL, 0x02431708UL, 0x02434809UL, 0x02436ED0UL,
    0x02441A76UL, 0x02443821UL, 0x024458E3UL, 0x0244F91FUL, 0x02454863UL,
    0x0246190AUL, 0x02464863UL, 0x024FF929UL, 0x02525ED0UL, 0x025314E1UL,
    0x025348FBUL, 0x025419A1UL, 0x025458D0UL, 0x0254F4E5UL, 0x02552861UL,
    0x025FF912UL, 0x02665993UL, 0x027F5A69UL, 0x029F1481UL, 0x02CF28A4UL,
    0x03100AF0UL, 0x031120AAUL, 0x031147A0UL, 0x03118356UL, 0x031217ECUL,
    0x03123B5EUL, 0x03124008UL, 0x03127350UL, 0x031314AAUL, 0x0313201EUL,
    0x03134F08UL, 0x03136863UL, 0x03141A5EUL, 0x03143F3CUL, 0x03200847UL,
    0x03212AADUL, 0x03214F20UL, 0x03218ED6UL, 0x032218ADUL, 0x032237BCUL,
    0x03225809UL, 0x03229416UL, 0x032317EDUL, 0x03234F20UL, 0x03237350UL,
    0x0323FA6BUL, 0x03243F08UL, 0x03246863UL, 0x0324F925UL, 0x03254221UL,
    0x0325F8DFUL, 0x03264821UL, 0x032FFE29UL, 0x03311E47UL, 0x03313F08UL,
    0x0331580DUL, 0x033214DEUL, 0x03323F08UL, 0x03324020UL, 0x03326350UL,
    0x033294E9UL, 0x033317DEUL, 0x03333F08UL, 0x0333627BUL, 0x0333A9A9UL,
    0x033417FCUL, 0x03343220UL, 0x0334627BUL, 0x0334A9A9UL, 0x0335148AUL,
    0x03353220UL, 0x033588E4UL, 0x03361A4AUL, 0x03363821UL, 0x0336F8D2UL,
    0x03376863UL, 0x03411939UL, 0x0341583BUL, 0x034214C8UL, 0x03424809UL,
    0x03426ED0UL, 0x03431588UL, 0x03434809UL, 0x03436ED0UL, 0x03441A48UL,
    0x0344480DUL, 0x03446ED0UL, 0x03451A4AUL, 0x03453809UL, 0x03455EFBUL,
    0x034614CAUL, 0x03463849UL, 0x034F8924UL, 0x03500A69UL, 0x035252D0UL,
    0x035314E0UL, 0x0353324DUL, 0x03535ED0UL, 0x035414E0UL, 0x0354324DUL,
    0x03545ED0UL, 0x0354F4E8UL, 0x0355384DUL, 0x03555ED0UL, 0x0355F4DFUL,
    0x03564350UL, 0x035969A6UL, 0x035FFA52UL, 0x036649A6UL, 0x036FFA52UL,
    0x037F4F66UL, 0x039D7492UL, 0x03BF6892UL, 0x03DF8A1FUL, 0x04100B84UL,
    0x04112107UL, 0x0411520DUL, 0x041214EAUL, 0x04124F20UL, 0x04131EDEUL,
    0x04133F08UL, 0x04135809UL, 0x0413F42BUL, 0x04142F08UL, 0x04200847UL,
    0x042121FCUL, 0x04214209UL, 0x04221407UL, 0x0422203CUL, 0x04224209UL,
    0x04226350UL, 0x04231A7CUL, 0x04234209UL, 0x0423637BUL, 0x04241A7CUL,
    0x04243220UL, 0x0424627BUL, 0x042514C8UL, 0x04254809UL, 0x042FF8E9UL,
    0x04311E47UL, 0x04313220UL, 0x0431527BUL, 0x043214FCUL, 0x04323220UL,
    0x04326250UL, 0x043315BCUL, 0x04333220UL, 0x0433527BUL, 0x04338413UL,
    0x04341488UL, 0x04344809UL, 0x04346ED0UL, 0x04351F48UL, 0x0435527BUL,
    0x0435F9A5UL, 0x04363809UL, 0x04375EFBUL, 0x043FF929UL, 0x04412E79UL,
    0x0441427BUL, 0x044219B9UL, 0x04423809UL, 0x0442537BUL, 0x044314C8UL,
    0x04432020UL, 0x0443527BUL, 0x044414CAUL, 0x04443809UL, 0x0444537BUL,
    0x04448993UL, 0x0445148AUL, 0x04453809UL, 0x04455ED0UL, 0x0445F4E5UL,
    0x0446384DUL, 0x045009A6UL, 0x045272D3UL, 0x045314A0UL, 0x0453324DUL,
    0x04535ED0UL, 0x045415A0UL, 0x0454324DUL, 0x04545ED0UL, 0x04551F60UL,
    0x0455324DUL, 0x04562989UL, 0x04564350UL, 0x045FF4D2UL, 0x04665993UL,
    0x047FFF62UL, 0x048FF725UL, 0x049F44BDUL, 0x04BFB7E5UL, 0x04EF8A25UL,
    0x04FFFB98UL, 0x051131F9UL, 0x051212C7UL, 0x05134209UL, 0x05200247UL,
    0x05211007UL, 0x05213E60UL, 0x052212C7UL, 0x05224209UL, 0x052319BCUL,
    0x05233220UL, 0x0523527BUL, 0x052414C8UL, 0x05243820UL, 0x053112F9UL,
    0x05313E49UL, 0x05321439UL, 0x05323E49UL, 0x0532537BUL, 0x053314C8UL,
    0x0533480DUL, 0x05337413UL, 0x05341488UL, 0x0534527BUL, 0x0534F4EBUL,
    0x05353809UL, 0x05356ED0UL, 0x0535F4E5UL, 0x0536427BUL, 0x054119B9UL,
    0x054212F9UL, 0x05423249UL, 0x05426ED3UL, 0x05431739UL, 0x05433249UL,
    0x05435ED0UL, 0x0543F4EBUL, 0x05443809UL, 0x05445ED0UL, 0x0544F4E8UL,
    0x0545324DUL, 0x054FF992UL, 0x055362D3UL, 0x0553F5ABUL, 0x05544350UL,
    0x055514CAUL, 0x0555427BUL, 0x0555F4E5UL, 0x0556327BUL, 0x055FF4D2UL,
    0x05665993UL, 0x05774F53UL, 0x059FF728UL, 0x05CC37FDUL, 0x05EFBA28UL,
    0x05FFFB98UL, 0x061131F9UL, 0x06121407UL, 0x06133E60UL, 0x061A72E4UL,
    0x06211E47UL, 0x06214E4BUL, 0x062214C7UL, 0x06223E60UL, 0x062312F9UL,
    0x06233E60UL, 0x063112F9UL, 0x06313E4CUL, 0x063219B9UL, 0x06323E49UL,
    0x06331439UL, 0x06333809UL, 0x06336EE6UL, 0x0633F5ABUL, 0x06343809UL,
    0x0634F42BUL, 0x0635427BUL, 0x063FF992UL, 0x064342FBUL, 0x0643F4EBUL,
    0x0644427BUL, 0x064524C9UL, 0x06655993UL, 0x0666170AUL, 0x066652E6UL,
    0x067A6F56UL, 0x0698473DUL, 0x06CF67D2UL, 0x06EF3A26UL, 0x06FFFAD8UL,
    0x071131CCUL, 0x07211307UL, 0x07222E79UL, 0x072292DCUL, 0x07234E4BUL,
    0x073112F9UL, 0x07322339UL, 0x073632CBUL, 0x073FF992UL, 0x074432CBUL,
    0x075549A6UL, 0x0776FF68UL, 0x07774350UL, 0x0788473DUL, 0x07CF4516UL,
    0x07EF3A26UL, 0x07FFFAD8UL, 0x08222E79UL, 0x083112F9UL, 0x0834330BUL,
    0x0845338BUL, 0x08756F5CUL, 0x0887F725UL, 0x08884366UL, 0x08AF649CUL,
    0x08F00898UL, 0x08FFFAD8UL, 0x091111C7UL, 0x0932330BUL, 0x0945338BUL,
    0x09774F7DUL, 0x0998C725UL, 0x09996416UL, 0x09EF87E5UL, 0x09FFFAD8UL,
    0x0A34330BUL, 0x0A45338BUL, 0x0A77467DUL, 0x0AA9F52BUL, 0x0AAA6416UL,
    0x0ABD67DFUL, 0x0AFFFA18UL, 0x0B33330BUL, 0x0B4443A6UL, 0x0B76467DUL,
    0x0BB9751FUL, 0x0BBB59BDUL, 0x0BEF5892UL, 0x0BFFFAD8UL, 0x0C221339UL,
    0x0C53338EUL, 0x0C76367DUL, 0x0CCAF52EUL, 0x0CCC6996UL, 0x0CFFFA18UL,
    0x0D44438EUL, 0x0D64264EUL, 0x0DDCF52EUL, 0x0DDD5996UL, 0x0DFFFA18UL,
    0x0E43338EUL, 0x0E68465CUL, 0x0EEE651CUL, 0x0EFFFA18UL, 0x0F33238EUL,
    0x0F553659UL, 0x0F8F451CUL, 0x0FAFF8AEUL, 0x0FF00A2EUL, 0x0FFF1ACCUL,
    0x0FFF33BDUL, 0x0FFF7522UL, 0x0FFFFAD8UL, 0x10002C72UL, 0x1111103EUL,
    0x11121E83UL, 0x11131E9AUL, 0x1121115AUL, 0x11221170UL, 0x112316F0UL,
    0x1124175DUL, 0x11311CC2UL, 0x11321182UL, 0x11331D42UL, 0x11411D48UL,
    0x11421836UL, 0x11431876UL, 0x11441DF5UL, 0x1152287BUL, 0x12111903UL,
    0x1212115AUL, 0x121316F0UL, 0x12211B30UL, 0x12221B30UL, 0x12231B02UL,
    0x12311184UL, 0x12321D04UL, 0x12331784UL, 0x12411D39UL, 0x12412020UL,
    0x12422220UL, 0x12511D89UL, 0x1252227BUL, 0x1258184AUL, 0x12832992UL,
    0x1311171AUL, 0x13121B30UL, 0x1312202CUL, 0x131320AAUL, 0x132120AAUL,
    0x132220ADUL, 0x13232FEDUL, 0x13312107UL, 0x13322134UL, 0x13332134UL,
    0x13411D39UL, 0x13431E74UL, 0x13441834UL, 0x134812B4UL, 0x1352230BUL,
    0x13611E4BUL, 0x136522E4UL, 0x141113C2UL, 0x141211C4UL, 0x143121F9UL,
    0x143221F9UL, 0x143321CAUL, 0x14351D34UL, 0x14431E47UL, 0x14441E74UL,
    0x144612B4UL, 0x1452230EUL, 0x14551E74UL, 0x1471130EUL, 0x151113C2UL,
    0x152121F9UL, 0x153121F9UL, 0x153221F9UL, 0x15331007UL, 0x15522E4EUL,
    0x15551E74UL, 0x1571130EUL, 0x161113C7UL, 0x162121F9UL, 0x163121F9UL,
    0x16611E79UL, 0x16661334UL, 0x171113C7UL, 0x172121F9UL, 0x17451E47UL,
    0x1771130CUL, 0x181113C7UL, 0x18211E47UL, 0x18511E4CUL, 0x1882130CUL,
    0x191113C7UL, 0x19331E79UL, 0x1A111307UL, 0x1A311E79UL, 0x1F52230EUL,
    0x200003C1UL, 0x20001027UL, 0x20004467UL, 0x200079E7UL, 0x2000E5EFUL,
    0x21100BC0UL, 0x211129C0UL, 0x21114011UL, 0x211189E7UL, 0x2111F5EFUL,
    0x21124011UL, 0x21127455UL, 0x211325C0UL, 0x21134011UL, 0x21137455UL,
    0x211425C0UL, 0x21212440UL, 0x21213001UL, 0x2121F9EFUL, 0x21222540UL,
    0x21226455UL, 0x2122F5EFUL, 0x21233051UL, 0x2123F56FUL, 0x21244451UL,
    0x21312551UL, 0x21323451UL, 0x21332551UL, 0x21844555UL, 0x221125C0UL,
    0x22113011UL, 0x2211F9EFUL, 0x22123051UL, 0x2212F9EFUL, 0x221329D1UL,
    0x22212541UL, 0x22213011UL, 0x2221F9EFUL, 0x22223451UL, 0x2222F9EFUL,
    0x22232551UL, 0x2223F56FUL, 0x22312551UL, 0x223229D1UL, 0x2232F56FUL,
    0x22332551UL, 0x2233F56FUL, 0x22875555UL, 0x22DAB5D7UL, 0x23112BD1UL,
    0x23115467UL, 0x231225D1UL, 0x232129D1UL, 0x232229D1UL, 0x2322F9EFUL,
    0x23233451UL, 0x2323F9EFUL, 0x23312551UL, 0x233229D1UL, 0x2332F9EFUL,
    0x2333F56FUL, 0x237FF557UL, 0x238569D5UL, 0x23D955D7UL, 0x24100BE7UL,
    0x248789E7UL, 0x24E315D7UL, 0x24FFFBEFUL, 0x259869E7UL, 0x25DFF5EFUL,
    0x25FFFBEFUL, 0x268789E7UL, 0x26DFA5D7UL, 0x26FFFBEFUL, 0x279649E7UL,
    0x27E425D7UL, 0x27FFFBEFUL, 0x288879E7UL, 0x28EFF5EFUL, 0x28FFFBEFUL,
    0x298439E7UL, 0x29F115EFUL, 0x29FFFBEFUL, 0x2A7659E7UL, 0x2AEF75D7UL,
    0x2AFFFBEFUL, 0x2B7C89E7UL, 0x2BEF95D7UL, 0x2BFFFBEFUL, 0x2C6659E7UL,
    0x2CD555D7UL, 0x2CFFFBEFUL, 0x2D6329E7UL, 0x2DDD55E7UL, 0x2DFFFBEBUL,
    0x2E8479D7UL, 0x2EEE35E7UL, 0x2EFFFBEFUL, 0x2F5459E7UL, 0x2FCF85D7UL,
    0x2FFEFBEBUL, 0x2FFFA5EFUL, 0x2FFFEBEFUL, 0x30001AE7UL, 0x30002001UL,
    0x311129C0UL, 0x31221015UL, 0x31232000UL, 0x31332451UL, 0x32112540UL,
    0x32131027UL, 0x32212440UL, 0x33452455UL, 0x4000F9D7UL, 0x4122F9D7UL,
    0x43F65555UL, 0x43FFF5D7UL, 0x44F55567UL, 0x44FFF5D7UL, 0x45F00557UL,
    0x45FFF5D7UL, 0x46F659D7UL, 0x471005E7UL, 0x47F449E7UL, 0x481005E7UL,
    0x48EFA9D5UL, 0x48FFF5EFUL, 0x49F449E7UL, 0x49FFF5EFUL, 0x4AEA79E7UL,
    0x4AFFF5EFUL, 0x4BE9C9D5UL, 0x4BFFF5EFUL, 0x4CE549E7UL, 0x4CFFF5EFUL,
    0x4DE359E7UL, 0x4DFFF5D7UL, 0x4EE469E7UL, 0x4EFFF5D7UL, 0x4FEF39E7UL,
    0x4FFFF5EFUL, 0x6000F9E7UL, 0x69FFF557UL, 0x6FFFF9D7UL, 0x811009D7UL,
    0x8EFFF555UL, 0xFFFFF9E7UL};

static const SHORT ari_pk[64][17] = {
    {708, 706, 579, 569, 568, 567, 479, 469, 297, 138, 97, 91, 72, 52, 38, 34,
     0},
    {7619, 6917, 6519, 6412, 5514, 5003, 4683, 4563, 3907, 3297, 3125, 3060,
     2904, 2718, 2631, 2590, 0},
    {7263, 4888, 4810, 4803, 1889, 415, 335, 327, 195, 72, 52, 49, 36, 20, 15,
     14, 0},
    {3626, 2197, 2188, 2187, 582, 57, 47, 46, 30, 12, 9, 8, 6, 4, 3, 2, 0},
    {7806, 5541, 5451, 5441, 2720, 834, 691, 674, 487, 243, 179, 167, 139, 98,
     77, 70, 0},
    {6684, 4101, 4058, 4055, 1748, 426, 368, 364, 322, 257, 235, 232, 228, 222,
     217, 215, 0},
    {9162, 5964, 5831, 5819, 3269, 866, 658, 638, 535, 348, 258, 244, 234, 214,
     195, 186, 0},
    {10638, 8491, 8365, 8351, 4418, 2067, 1859, 1834, 1190, 601, 495, 478, 356,
     217, 174, 164, 0},
    {13389, 10514, 10032, 9961, 7166, 3488, 2655, 2524, 2015, 1140, 760, 672,
     585, 426, 325, 283, 0},
    {14861, 12788, 12115, 11952, 9987, 6657, 5323, 4984, 4324, 3001, 2205, 1943,
     1764, 1394, 1115, 978, 0},
    {12876, 10004, 9661, 9610, 7107, 3435, 2711, 2595, 2257, 1508, 1059, 952,
     893, 753, 609, 538, 0},
    {15125, 13591, 13049, 12874, 11192, 8543, 7406, 7023, 6291, 4922, 4104,
     3769, 3465, 2890, 2486, 2275, 0},
    {14574, 13106, 12731, 12638, 10453, 7947, 7233, 7037, 6031, 4618, 4081,
     3906, 3465, 2802, 2476, 2349, 0},
    {15070, 13179, 12517, 12351, 10742, 7657, 6200, 5825, 5264, 3998, 3014,
     2662, 2510, 2153, 1799, 1564, 0},
    {15542, 14466, 14007, 13844, 12489, 10409, 9481, 9132, 8305, 6940, 6193,
     5867, 5458, 4743, 4291, 4047, 0},
    {15165, 14384, 14084, 13934, 12911, 11485, 10844, 10513, 10002, 8993, 8380,
     8051, 7711, 7036, 6514, 6233, 0},
    {15642, 14279, 13625, 13393, 12348, 9971, 8405, 7858, 7335, 6119, 4918,
     4376, 4185, 3719, 3231, 2860, 0},
    {13408, 13407, 11471, 11218, 11217, 11216, 9473, 9216, 6480, 3689, 2857,
     2690, 2256, 1732, 1405, 1302, 0},
    {16098, 15584, 15191, 14931, 14514, 13578, 12703, 12103, 11830, 11172,
     10475, 9867, 9695, 9281, 8825, 8389, 0},
    {15844, 14873, 14277, 13996, 13230, 11535, 10205, 9543, 9107, 8086, 7085,
     6419, 6214, 5713, 5195, 4731, 0},
    {16131, 15720, 15443, 15276, 14848, 13971, 13314, 12910, 12591, 11874,
     11225, 10788, 10573, 10077, 9585, 9209, 0},
    {16331, 16330, 12283, 11435, 11434, 11433, 8725, 8049, 6065, 4138, 3187,
     2842, 2529, 2171, 1907, 1745, 0},
    {16011, 15292, 14782, 14528, 14008, 12767, 11556, 10921, 10591, 9759, 8813,
     8043, 7855, 7383, 6863, 6282, 0},
    {16380, 16379, 15159, 14610, 14609, 14608, 12859, 12111, 11046, 9536, 8348,
     7713, 7216, 6533, 5964, 5546, 0},
    {16367, 16333, 16294, 16253, 16222, 16143, 16048, 15947, 15915, 15832,
     15731, 15619, 15589, 15512, 15416, 15310, 0},
    {15967, 15319, 14937, 14753, 14010, 12638, 11787, 11360, 10805, 9706, 8934,
     8515, 8166, 7456, 6911, 6575, 0},
    {4906, 3005, 2985, 2984, 875, 102, 83, 81, 47, 17, 12, 11, 8, 5, 4, 3, 0},
    {7217, 4346, 4269, 4264, 1924, 428, 340, 332, 280, 203, 179, 175, 171, 164,
     159, 157, 0},
    {16010, 15415, 15032, 14805, 14228, 13043, 12168, 11634, 11265, 10419, 9645,
     9110, 8892, 8378, 7850, 7437, 0},
    {8573, 5218, 5046, 5032, 2787, 771, 555, 533, 443, 286, 218, 205, 197, 181,
     168, 162, 0},
    {11474, 8095, 7822, 7796, 4632, 1443, 1046, 1004, 748, 351, 218, 194, 167,
     121, 93, 83, 0},
    {16152, 15764, 15463, 15264, 14925, 14189, 13536, 13070, 12846, 12314,
     11763, 11277, 11131, 10777, 10383, 10011, 0},
    {14187, 11654, 11043, 10919, 8498, 4885, 3778, 3552, 2947, 1835, 1283, 1134,
     998, 749, 585, 514, 0},
    {14162, 11527, 10759, 10557, 8601, 5417, 4105, 3753, 3286, 2353, 1708, 1473,
     1370, 1148, 959, 840, 0},
    {16205, 15902, 15669, 15498, 15213, 14601, 14068, 13674, 13463, 12970,
     12471, 12061, 11916, 11564, 11183, 10841, 0},
    {15043, 12972, 12092, 11792, 10265, 7446, 5934, 5379, 4883, 3825, 3036,
     2647, 2507, 2185, 1901, 1699, 0},
    {15320, 13694, 12782, 12352, 11191, 8936, 7433, 6671, 6255, 5366, 4622,
     4158, 4020, 3712, 3420, 3198, 0},
    {16255, 16020, 15768, 15600, 15416, 14963, 14440, 14006, 13875, 13534,
     13137, 12697, 12602, 12364, 12084, 11781, 0},
    {15627, 14503, 13906, 13622, 12557, 10527, 9269, 8661, 8117, 6933, 5994,
     5474, 5222, 4664, 4166, 3841, 0},
    {16366, 16365, 14547, 14160, 14159, 14158, 11969, 11473, 8735, 6147, 4911,
     4530, 3865, 3180, 2710, 2473, 0},
    {16257, 16038, 15871, 15754, 15536, 15071, 14673, 14390, 14230, 13842,
     13452, 13136, 13021, 12745, 12434, 12154, 0},
    {15855, 14971, 14338, 13939, 13239, 11782, 10585, 9805, 9444, 8623, 7846,
     7254, 7079, 6673, 6262, 5923, 0},
    {9492, 6318, 6197, 6189, 3004, 652, 489, 477, 333, 143, 96, 90, 78, 60, 50,
     47, 0},
    {16313, 16191, 16063, 15968, 15851, 15590, 15303, 15082, 14968, 14704,
     14427, 14177, 14095, 13899, 13674, 13457, 0},
    {8485, 5473, 5389, 5383, 2411, 494, 386, 377, 278, 150, 117, 112, 103, 89,
     81, 78, 0},
    {10497, 7154, 6959, 6943, 3788, 1004, 734, 709, 517, 238, 152, 138, 120, 90,
     72, 66, 0},
    {16317, 16226, 16127, 16040, 15955, 15762, 15547, 15345, 15277, 15111,
     14922, 14723, 14671, 14546, 14396, 14239, 0},
    {16382, 16381, 15858, 15540, 15539, 15538, 14704, 14168, 13768, 13092,
     12452, 11925, 11683, 11268, 10841, 10460, 0},
    {5974, 3798, 3758, 3755, 1275, 205, 166, 162, 95, 35, 26, 24, 18, 11, 8, 7,
     0},
    {3532, 2258, 2246, 2244, 731, 135, 118, 115, 87, 45, 36, 34, 29, 21, 17, 16,
     0},
    {7466, 4882, 4821, 4811, 2476, 886, 788, 771, 688, 531, 469, 457, 437, 400,
     369, 361, 0},
    {9580, 5772, 5291, 5216, 3444, 1496, 1025, 928, 806, 578, 433, 384, 366,
     331, 296, 273, 0},
    {10692, 7730, 7543, 7521, 4679, 1746, 1391, 1346, 1128, 692, 495, 458, 424,
     353, 291, 268, 0},
    {11040, 7132, 6549, 6452, 4377, 1875, 1253, 1130, 958, 631, 431, 370, 346,
     296, 253, 227, 0},
    {12687, 9332, 8701, 8585, 6266, 3093, 2182, 2004, 1683, 1072, 712, 608, 559,
     458, 373, 323, 0},
    {13429, 9853, 8860, 8584, 6806, 4039, 2862, 2478, 2239, 1764, 1409, 1224,
     1178, 1077, 979, 903, 0},
    {14685, 12163, 11061, 10668, 9101, 6345, 4871, 4263, 3908, 3200, 2668, 2368,
     2285, 2106, 1942, 1819, 0},
    {13295, 11302, 10999, 10945, 7947, 5036, 4490, 4385, 3391, 2185, 1836, 1757,
     1424, 998, 833, 785, 0},
    {4992, 2993, 2972, 2970, 1269, 575, 552, 549, 530, 505, 497, 495, 493, 489,
     486, 485, 0},
    {15419, 13862, 13104, 12819, 11429, 8753, 7220, 6651, 6020, 4667, 3663,
     3220, 2995, 2511, 2107, 1871, 0},
    {12468, 9263, 8912, 8873, 5758, 2193, 1625, 1556, 1187, 589, 371, 330, 283,
     200, 149, 131, 0},
    {15870, 15076, 14615, 14369, 13586, 12034, 10990, 10423, 9953, 8908, 8031,
     7488, 7233, 6648, 6101, 5712, 0},
    {1693, 978, 976, 975, 194, 18, 16, 15, 11, 7, 6, 5, 4, 3, 2, 1, 0},
    {7992, 5218, 5147, 5143, 2152, 366, 282, 276, 173, 59, 38, 35, 27, 16, 11,
     10, 0}};

typedef struct {
  int low;
  int high;
  int vobf;
} Tastat;

static inline INT mul_sbc_14bits(INT r, INT c) {
  return (((INT)r) * ((INT)c)) >> stat_bitsnew;
}

static inline INT ari_decode_14bits(HANDLE_FDK_BITSTREAM hBs, Tastat *s,
                                    const SHORT *RESTRICT c_freq, int cfl) {
  INT symbol;
  INT low, high, range, value;
  INT c;
  const SHORT *p;

  low = s->low;
  high = s->high;
  value = s->vobf;

  range = high - low + 1;
  c = (((int)(value - low + 1)) << stat_bitsnew) - ((int)1);
  p = (const SHORT *)(c_freq - 1);

  if (cfl == (VAL_ESC + 1)) {
    /* In 50% of all cases, the first entry is the right one, so we check it
     * prior to all others */
    if ((p[1] * range) > c) {
      p += 1;
      if ((p[8] * range) > c) {
        p += 8;
      }
      if ((p[4] * range) > c) {
        p += 4;
      }
      if ((p[2] * range) > c) {
        p += 2;
      }
      if ((p[1] * range) > c) {
        p += 1;
      }
    }
  } else if (cfl == 4) {
    if ((p[2] * range) > c) {
      p += 2;
    }
    if ((p[1] * range) > c) {
      p += 1;
    }
  } else if (cfl == 2) {
    if ((p[1] * range) > c) {
      p += 1;
    }
  } else if (cfl == 27) {
    const SHORT *p_24 = p + 24;

    if ((p[16] * range) > c) {
      p += 16;
    }
    if ((p[8] * range) > c) {
      p += 8;
    }
    if (p != p_24) {
      if ((p[4] * range) > c) {
        p += 4;
      }
    }
    if ((p[2] * range) > c) {
      p += 2;
    }

    if (p != &p_24[2]) {
      if ((p[1] * range) > c) {
        p += 1;
      }
    }
  }

  symbol = (INT)(p - (const SHORT *)(c_freq - 1));

  if (symbol) {
    high = low + mul_sbc_14bits(range, c_freq[symbol - 1]) - 1;
  }

  low += mul_sbc_14bits(range, c_freq[symbol]);

  USHORT us_high = (USHORT)high;
  USHORT us_low = (USHORT)low;
  while (1) {
    if (us_high & 0x8000) {
      if (!(us_low & 0x8000)) {
        if (us_low & 0x4000 && !(us_high & 0x4000)) {
          us_low -= 0x4000;
          us_high -= 0x4000;
          value -= 0x4000;
        } else
          break;
      }
    }
    us_low = us_low << 1;
    us_high = (us_high << 1) | 1;
    value = (value << 1) | FDKreadBit(hBs);
  }
  s->low = (int)us_low;
  s->high = (int)us_high;
  s->vobf = value & 0xFFFF;

  return symbol;
}

static inline void copyTableAmrwbArith2(UCHAR tab[], int sizeIn, int sizeOut) {
  int i;
  int j;
  int k = 2;

  tab += 2;

  if (sizeIn < sizeOut) {
    tab[sizeOut + 0] = tab[sizeIn + 0];
    tab[sizeOut + 1] = tab[sizeIn + 1];
    if (sizeIn < (sizeOut >> 2)) {
      k = 8;
    } else if (sizeIn == (sizeOut >> 2)) {
      k = 4;
    }

    i = sizeOut - 1;
    j = sizeIn - 1;

    for (; i >= 0; j--) {
      UCHAR tq_data0 = tab[j];

      for (int l = (k >> 1); l > 0; l--) {
        tab[i--] = tq_data0;
        tab[i--] = tq_data0;
      }
    }
  } else {
    if (sizeOut < (sizeIn >> 2)) {
      k = 8;
    } else if (sizeOut == (sizeIn >> 2)) {
      k = 4;
    }

    for (i = 0, j = 0; i < sizeOut; j += k) {
      UCHAR tq_data0 = tab[j];

      tab[i++] = tq_data0;
    }
    tab[sizeOut + 0] = tab[sizeIn + 0];
    tab[sizeOut + 1] = tab[sizeIn + 1];
  }
}

static inline ULONG get_pk_v2(ULONG s) {
  const ULONG *p = ari_merged_hash_ps;
  ULONG s12 = (fMax((UINT)s, (UINT)1) << 12) - 1;
  if (s12 > p[485]) {
    p += 486; /* 742 - 256 = 486 */
  } else {
    if (s12 > p[255]) p += 256;
  }

  if (s12 > p[127]) {
    p += 128;
  }
  if (s12 > p[63]) {
    p += 64;
  }
  if (s12 > p[31]) {
    p += 32;
  }
  if (s12 > p[15]) {
    p += 16;
  }
  if (s12 > p[7]) {
    p += 8;
  }
  if (s12 > p[3]) {
    p += 4;
  }
  if (s12 > p[1]) {
    p += 2;
  }
  ULONG j = p[0];
  if (s12 > j) j = p[1];
  if (s != (j >> 12)) j >>= 6;
  return (j & 0x3F);
}

static ARITH_CODING_ERROR decode2(HANDLE_FDK_BITSTREAM bbuf,
                                  UCHAR *RESTRICT c_prev,
                                  FIXP_DBL *RESTRICT pSpectralCoefficient,
                                  INT n, INT nt) {
  Tastat as;
  int i, l, r;
  INT lev, esc_nb, pki;
  USHORT state_inc;
  UINT s;
  ARITH_CODING_ERROR ErrorStatus = ARITH_CODER_OK;

  int c_3 = 0; /* context of current frame 3 time steps ago */
  int c_2 = 0; /* context of current frame 2 time steps ago */
  int c_1 = 0; /* context of current frame 1 time steps ago */
  int c_0 = 1; /* context of current frame to be calculated */

  /* ari_start_decoding_14bits */
  as.low = 0;
  as.high = ari_q4new;
  as.vobf = FDKreadBits(bbuf, cbitsnew);

  /* arith_map_context */
  state_inc = c_prev[0] << 12;

  for (i = 0; i < n; i++) {
    /* arith_get_context */
    s = state_inc >> 8;
    s = s + (c_prev[i + 1] << 8);
    s = (s << 4) + c_1;

    state_inc = s;

    if (i > 3) {
      /* Cumulative amplitude below 2 */
      if ((c_1 + c_2 + c_3) < 5) {
        s += 0x10000;
      }
    }

    /* MSBs decoding */
    for (lev = esc_nb = 0;;) {
      pki = get_pk_v2(s + (esc_nb << (VAL_ESC + 1)));
      r = ari_decode_14bits(bbuf, &as, ari_pk[pki], VAL_ESC + 1);
      if (r < VAL_ESC) {
        break;
      }

      lev++;

      if (lev > 23) return ARITH_CODER_ERROR;

      if (esc_nb < 7) {
        esc_nb++;
      }
    }

    /* Stop symbol */
    if (r == 0) {
      if (esc_nb > 0) {
        break; /* Stop symbol */
      }
      c_0 = 1;
    } else /* if (r==0) */
    {
      INT b = r >> 2;
      INT a = r & 0x3;

      /* LSBs decoding */
      for (l = 0; l < lev; l++) {
        {
          int pidx = (a == 0) ? 1 : ((b == 0) ? 0 : 2);
          r = ari_decode_14bits(bbuf, &as, ari_lsb2[pidx], 4);
        }
        a = (a << 1) | (r & 1);
        b = (b << 1) | (r >> 1);
      }

      pSpectralCoefficient[2 * i] = (FIXP_DBL)a;
      pSpectralCoefficient[2 * i + 1] = (FIXP_DBL)b;

      c_0 = a + b + 1;
      if (c_0 > 0xF) {
        c_0 = 0xF;
      }

    } /* endif (r==0) */

    /* arith_update_context */
    c_3 = c_2;
    c_2 = c_1;
    c_1 = c_0;
    c_prev[i] = (UCHAR)c_0;

  } /* for (i=0; i<n; i++) */

  FDKpushBack(bbuf, cbitsnew - 2);

  /* We need to run only from 0 to i-1 since all other q[i][1].a,b will be
   * cleared later */
  int j = i;
  for (i = 0; i < j; i++) {
    int bits = 0;
    if (pSpectralCoefficient[2 * i] != (FIXP_DBL)0) bits++;
    if (pSpectralCoefficient[2 * i + 1] != (FIXP_DBL)0) bits++;

    if (bits) {
      r = FDKreadBits(bbuf, bits);
      if (pSpectralCoefficient[2 * i] != (FIXP_DBL)0 && !(r >> (bits - 1))) {
        pSpectralCoefficient[2 * i] = -pSpectralCoefficient[2 * i];
      }
      if (pSpectralCoefficient[2 * i + 1] != (FIXP_DBL)0 && !(r & 1)) {
        pSpectralCoefficient[2 * i + 1] = -pSpectralCoefficient[2 * i + 1];
      }
    }
  }

  FDKmemset(&c_prev[i], 1, sizeof(c_prev[0]) * (nt - i));

  return ErrorStatus;
}

CArcoData *CArco_Create(void) { return GetArcoData(); }

void CArco_Destroy(CArcoData *pArcoData) { FreeArcoData(&pArcoData); }

ARITH_CODING_ERROR CArco_DecodeArithData(CArcoData *pArcoData,
                                         HANDLE_FDK_BITSTREAM hBs,
                                         FIXP_DBL *RESTRICT mdctSpectrum,
                                         int lg, int lg_max,
                                         int arith_reset_flag) {
  ARITH_CODING_ERROR ErrorStatus = ARITH_CODER_OK;

  /* Check lg and lg_max consistency. */
  if (lg_max < lg) {
    return ARITH_CODER_ERROR;
  }

  FDKmemclear(mdctSpectrum, lg_max * sizeof(FIXP_DBL));

  /* arith_map_context */
  if (arith_reset_flag) {
    FDKmemclear(pArcoData->c_prev,
                sizeof(pArcoData->c_prev[0]) * ((lg_max / 2) + 4));
  } else {
    if (lg_max != pArcoData->m_numberLinesPrev) {
      if (pArcoData->m_numberLinesPrev == 0) {
        /* Cannot decode without a valid AC context */
        return ARITH_CODER_ERROR;
      }

      /* short-to-long or long-to-short block transition */
      /* Current length differs compared to previous - perform up/downmix of
       * m_qbuf */
      copyTableAmrwbArith2(pArcoData->c_prev, pArcoData->m_numberLinesPrev >> 1,
                           lg_max >> 1);
    }
  }

  pArcoData->m_numberLinesPrev = lg_max;

  if (lg > 0) {
    ErrorStatus =
        decode2(hBs, pArcoData->c_prev + 2, mdctSpectrum, lg >> 1, lg_max >> 1);
  } else {
    FDKmemset(&pArcoData->c_prev[2], 1,
              sizeof(pArcoData->c_prev[2]) * (lg_max >> 1));
  }

  if ((INT)FDKgetValidBits(hBs) < 0) {
    return ARITH_CODER_ERROR;
  }

  return ErrorStatus;
}