LCOV - code coverage report
Current view: top level - lib_enc - ACcontextMapping_enc.c (source / functions) Hit Total Coverage
Test: Coverage on main -- merged total coverage @ efe53129c9ed87a5067dd0a8fb9dca41db9c4add Lines: 535 539 99.3 %
Date: 2026-02-12 08:06:51 Functions: 7 7 100.0 %

          Line data    Source code
       1             : /******************************************************************************************************
       2             : 
       3             :    (C) 2022-2026 IVAS codec Public Collaboration with portions copyright Dolby International AB, Ericsson AB,
       4             :    Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,
       5             :    Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,
       6             :    Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other
       7             :    contributors to this repository. All Rights Reserved.
       8             : 
       9             :    This software is protected by copyright law and by international treaties.
      10             :    The IVAS codec Public Collaboration consisting of Dolby International AB, Ericsson AB,
      11             :    Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V., Huawei Technologies Co. LTD.,
      12             :    Koninklijke Philips N.V., Nippon Telegraph and Telephone Corporation, Nokia Technologies Oy, Orange,
      13             :    Panasonic Holdings Corporation, Qualcomm Technologies, Inc., VoiceAge Corporation, and other
      14             :    contributors to this repository retain full ownership rights in their respective contributions in
      15             :    the software. This notice grants no license of any kind, including but not limited to patent
      16             :    license, nor is any license granted by implication, estoppel or otherwise.
      17             : 
      18             :    Contributors are required to enter into the IVAS codec Public Collaboration agreement before making
      19             :    contributions.
      20             : 
      21             :    This software is provided "AS IS", without any express or implied warranties. The software is in the
      22             :    development stage. It is intended exclusively for experts who have experience with such software and
      23             :    solely for the purpose of inspection. All implied warranties of non-infringement, merchantability
      24             :    and fitness for a particular purpose are hereby disclaimed and excluded.
      25             : 
      26             :    Any dispute, controversy or claim arising under or in relation to providing this software shall be
      27             :    submitted to and settled by the final, binding jurisdiction of the courts of Munich, Germany in
      28             :    accordance with the laws of the Federal Republic of Germany excluding its conflict of law rules and
      29             :    the United Nations Convention on Contracts on the International Sales of Goods.
      30             : 
      31             : *******************************************************************************************************/
      32             : 
      33             : /*====================================================================================
      34             :     EVS Codec 3GPP TS26.443 Nov 04, 2021. Version 12.14.0 / 13.10.0 / 14.6.0 / 15.4.0 / 16.3.0
      35             :   ====================================================================================*/
      36             : 
      37             : #include <stdint.h>
      38             : #include "options.h"
      39             : #include <assert.h>
      40             : #include "cnst.h"
      41             : #include "rom_com.h"
      42             : #include "prot.h"
      43             : #include "ivas_prot.h" /* Range coder header file */
      44             : #include "ivas_rom_com.h"
      45             : #include "ivas_rom_enc.h"
      46             : #ifdef DEBUGGING
      47             : #include "debug.h"
      48             : #endif
      49             : #include "wmc_auto.h"
      50             : 
      51             : 
      52             : /*-------------------------------------------------------------------*
      53             :  * ACcontextMapping_encode2_no_mem_s17_LC()
      54             :  *
      55             :  * Arithmetic encoder
      56             :  *-------------------------------------------------------------------*/
      57             : 
      58       30609 : void ACcontextMapping_encode2_no_mem_s17_LC(
      59             :     BSTR_ENC_HANDLE hBstr, /* i/o: bitstream handle            */
      60             :     int16_t *x,
      61             :     int16_t nt,
      62             :     int16_t lastnz,
      63             :     int16_t nbbits,
      64             :     int16_t resQMaxBits,
      65             :     CONTEXT_HM_CONFIG *hm_cfg )
      66             : {
      67             :     int16_t ptr[BITBUFSIZE];
      68             :     Tastat as, as_overflow;
      69             :     int16_t bp, bp_overflow;
      70             :     int16_t a1, b1, a1_i, b1_i, k;
      71             :     uint16_t t;
      72             :     int16_t pki, lev1;
      73             :     int16_t rateFlag;
      74             :     int16_t value;
      75             :     int16_t nbbits_ntuples, nbbits_lsbs, nbbits_signs, nbbits_signs_overflow, nbbits_lsbs_overflow, flag_overflow;
      76             :     int16_t *lsbs_bits;
      77             :     int16_t nt_half;
      78             :     int32_t c[2], *ctx;
      79             :     int32_t p1, p2;
      80             :     int16_t ii[2];
      81             :     int16_t idx1, idx2, idx;
      82             :     int16_t numPeakIndicesOrig, numHoleIndices;
      83             :     uint16_t signs[N_MAX];
      84             :     int16_t nbbits_m2;
      85             : 
      86       30609 :     a1 = 0; /* to avoid compilation warnings */
      87       30609 :     b1 = 0; /* to avoid compilation warnings */
      88             : 
      89             :     /* Rate flag */
      90       30609 :     if ( nbbits > 400 )
      91             :     {
      92       15316 :         rateFlag = 2 << NBITS_CONTEXT;
      93             :     }
      94             :     else
      95             :     {
      96       15293 :         rateFlag = 0;
      97             :     }
      98             : 
      99             :     /* Init */
     100       30609 :     nt_half = nt >> 1;
     101       30609 :     c[0] = c[1] = 0;
     102             : 
     103             :     /* Bits for encoding the number of encoded tuples */
     104       30609 :     nbbits_ntuples = 0;
     105       30609 :     k = 1;
     106             : 
     107      297293 :     while ( k < nt / 2 )
     108             :     {
     109      266684 :         nbbits_ntuples++;
     110      266684 :         k = k << 1;
     111             :     }
     112             : 
     113       30609 :     t = 0;
     114       30609 :     bp = nbbits_ntuples;
     115       30609 :     nbbits_signs = 0;
     116       30609 :     nbbits_lsbs = 0;
     117       30609 :     nbbits_m2 = nbbits - 2;
     118       30609 :     flag_overflow = 0;
     119             : 
     120       30609 :     if ( hm_cfg )
     121             :     {
     122             :         /* mapped domain */
     123        3620 :         numPeakIndicesOrig = hm_cfg->numPeakIndices;
     124        3620 :         hm_cfg->numPeakIndices = min( hm_cfg->numPeakIndices, lastnz );
     125        3620 :         numHoleIndices = lastnz - hm_cfg->numPeakIndices;
     126             : 
     127             :         /* Mark hole indices beyond lastnz as pruned */
     128      757322 :         for ( k = numHoleIndices; k < hm_cfg->numHoleIndices; ++k )
     129             :         {
     130      753702 :             hm_cfg->holeIndices[k] = hm_cfg->holeIndices[k] + nt;
     131             :         }
     132             : 
     133        3620 :         ii[0] = numPeakIndicesOrig;
     134        3620 :         ii[1] = 0;
     135             : 
     136        3620 :         p1 = p2 = 0; /* to avoid compilation warnings */
     137             :     }
     138             :     else
     139             :     {
     140             :         /* unmapped domain */
     141       26989 :         ii[0] = 0;
     142             : 
     143       26989 :         p1 = p2 = 0;
     144             : 
     145             :         /* Find last non-zero tuple */
     146             :         /* ensure termination of while loop by dummy value */
     147       26989 :         a1 = x[0];
     148       26989 :         x[0] = 1;
     149             : 
     150       88369 :         while ( x[lastnz - 1] == 0 && x[lastnz - 2] == 0 )
     151             :         {
     152       61380 :             lastnz -= 2;
     153             :         }
     154       26989 :         x[0] = a1;
     155             :     }
     156             : 
     157       30609 :     lsbs_bits = (int16_t *) ptr + nbbits - 1;
     158             : 
     159             :     /*Start Encoding*/
     160       30609 :     ari_start_encoding_14bits( &as );
     161             : 
     162             :     /*Main Loop through the 2-tuples*/
     163       30609 :     b1_i = -1;
     164             : 
     165     4729680 :     for ( k = 0; k < lastnz; k += 2 )
     166             :     {
     167             : 
     168     4699082 :         if ( hm_cfg )
     169             :         {
     170      507389 :             a1_i = get_next_coeff_mapped( ii, &p1, &idx1, hm_cfg );
     171      507389 :             b1_i = get_next_coeff_mapped( ii, &p2, &idx2, hm_cfg );
     172             :         }
     173             :         else
     174             :         {
     175     4191693 :             a1_i = get_next_coeff_unmapped( ii, &idx1 );
     176     4191693 :             b1_i = get_next_coeff_unmapped( ii, &idx2 );
     177             :         }
     178             : 
     179     4699082 :         idx = min( idx1, idx2 );
     180             : 
     181             :         /* Get context */
     182     4699082 :         ctx = &c[p1 | p2];
     183             : 
     184     4699082 :         t = (uint16_t) ( *ctx + rateFlag );
     185     4699082 :         t += ( nt_half >= idx ) ? 0 : ( 1 << NBITS_CONTEXT );
     186             : 
     187             :         /* Init current 2-tuple encoding */
     188             : 
     189     4699082 :         if ( flag_overflow != 0 )
     190             :         {
     191           0 :             x[a1_i] = 0;
     192           0 :             x[b1_i] = 0;
     193             :         }
     194             : 
     195     4699082 :         a1 = (int16_t) abs( x[a1_i] );
     196     4699082 :         b1 = (int16_t) abs( x[b1_i] );
     197             : 
     198     4699082 :         lev1 = -1;
     199             : 
     200             :         /*Copy states*/
     201     4699082 :         ari_copy_states( &as, &as_overflow );
     202     4699082 :         bp_overflow = bp;
     203     4699082 :         nbbits_signs_overflow = nbbits_signs;
     204     4699082 :         nbbits_lsbs_overflow = nbbits_lsbs;
     205             : 
     206             :         /*Signs encoding*/
     207             : 
     208     4699082 :         if ( a1 > 0 )
     209             :         {
     210     2132276 :             signs[nbbits_signs++] = ( (uint16_t) x[a1_i] >> ( sizeof( uint16_t ) * 8 - 1 ) );
     211             :         }
     212             : 
     213     4699082 :         if ( b1 > 0 )
     214             :         {
     215     2132142 :             signs[nbbits_signs++] = ( (uint16_t) x[b1_i] >> ( sizeof( uint16_t ) * 8 - 1 ) );
     216             :         }
     217             : 
     218             :         /* MSBs coding */
     219     6124852 :         while ( max( a1, b1 ) >= A_THRES )
     220             :         {
     221     1425770 :             pki = ari_lookup_s17_LC[t + ( ( lev1 + 1 ) << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
     222     1425770 :             bp = ari_encode_14bits_ext( ptr, bp, &as, VAL_ESC, ari_pk_s17_LC_ext[pki] );
     223             : 
     224     1425770 :             *lsbs_bits-- = a1 & 1;
     225     1425770 :             *lsbs_bits-- = b1 & 1;
     226             : 
     227             :             /* LSBs bit counting */
     228     1425770 :             nbbits_lsbs += 2;
     229             : 
     230     1425770 :             a1 >>= 1;
     231     1425770 :             b1 >>= 1;
     232             : 
     233     1425770 :             lev1 = min( lev1 + 1, 2 );
     234             :         }
     235             : 
     236     4699082 :         pki = ari_lookup_s17_LC[t + ( ( lev1 + 1 ) << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
     237     4699082 :         bp = ari_encode_14bits_ext( ptr, bp, &as, a1 + A_THRES * b1, ari_pk_s17_LC_ext[pki] );
     238             : 
     239             : 
     240             :         /* Check bit budget */
     241     4699082 :         if ( bp + as.bits_to_follow + nbbits_signs + nbbits_lsbs > nbbits_m2 )
     242             :         {
     243          11 :             ari_copy_states( &as_overflow, &as );
     244          11 :             bp = bp_overflow;
     245             : 
     246          11 :             if ( !flag_overflow )
     247             :             {
     248          11 :                 nbbits_signs = nbbits_signs_overflow;
     249          11 :                 nbbits_lsbs = nbbits_lsbs_overflow;
     250             : 
     251          11 :                 if ( hm_cfg )
     252             :                 {
     253           6 :                     flag_overflow = 1;
     254             : 
     255             :                     /* Code from now only zeros */
     256           6 :                     x[a1_i] = 0;
     257           6 :                     x[b1_i] = 0;
     258           6 :                     lev1 = -1;
     259             : 
     260           6 :                     pki = ari_lookup_s17_LC[t];
     261           6 :                     bp = ari_encode_14bits_ext( ptr, bp, &as, 0, ari_pk_s17_LC_ext[pki] );
     262             : 
     263           6 :                     if ( bp + as.bits_to_follow + nbbits_signs + nbbits_lsbs > nbbits_m2 )
     264             :                     {
     265           6 :                         ari_copy_states( &as_overflow, &as );
     266           6 :                         bp = bp_overflow;
     267           6 :                         break;
     268             :                     }
     269             :                 }
     270             :                 else
     271             :                 {
     272           5 :                     break;
     273             :                 }
     274             :             }
     275             :             else
     276             :             {
     277           0 :                 break;
     278             :             }
     279             :         }
     280             : 
     281             :         /* Update context for next 2-tuple */
     282     4699071 :         if ( p1 == p2 )
     283             :         {
     284             :             /* peak-peak or hole-hole context */
     285             : 
     286     4636947 :             if ( lev1 <= 0 )
     287             :             {
     288     4254301 :                 t = 1 + ( a1 + b1 ) * ( lev1 + 2 );
     289             :             }
     290             :             else
     291             :             {
     292      382646 :                 t = 13 + lev1;
     293             :             }
     294             : 
     295     4636947 :             *ctx = ( *ctx & 0xf ) * 16 + t;
     296             :         }
     297             :         else
     298             :         {
     299             :             /* mixed context */
     300             : 
     301       62124 :             if ( idx1 & 1 )
     302             :             {
     303             :                 /* update first context */
     304       31186 :                 c[p1] = update_mixed_context( c[p1], (int16_t) abs( x[a1_i] ) );
     305             :             }
     306             : 
     307       62124 :             if ( idx2 & 1 )
     308             :             {
     309             :                 /* update second context */
     310       30938 :                 c[p2] = update_mixed_context( c[p2], (int16_t) abs( x[b1_i] ) );
     311             :             }
     312             :         }
     313             :     } /*end of the 2-tuples loop*/
     314             : 
     315             : 
     316             :     /* End arithmetic coder, overflow management */
     317       30609 :     bp = ari_done_encoding_14bits( ptr, bp, &as );
     318             : 
     319             :     /*Overflow is detected*/
     320             : 
     321       30609 :     if ( k != lastnz )
     322             :     {
     323             : 
     324          11 :         if ( hm_cfg )
     325             :         {
     326             :             /*Fill with zero to be sure that decoder finish at the same position the MSB decoding*/
     327             : 
     328           9 :             for ( ; bp < nbbits - ( nbbits_signs + nbbits_lsbs ); )
     329             :             {
     330           3 :                 ptr[bp++] = 0;
     331             :             }
     332             :         }
     333             :         else
     334             :         {
     335           5 :             lastnz = k;
     336             :         }
     337             :     }
     338             : 
     339             :     /* Push number of encoded tuples */
     340       30609 :     value = ( lastnz >> 1 ) - 1;
     341       30609 :     push_next_indice( hBstr, value, nbbits_ntuples );
     342             : 
     343             :     /* Push arithmetic coded bits */
     344       30609 :     push_next_bits( hBstr, (uint16_t *) &ptr[nbbits_ntuples], bp - nbbits_ntuples );
     345             : 
     346             :     /* Push sign bits */
     347       30609 :     push_next_bits( hBstr, (uint16_t *) signs, nbbits_signs );
     348       30609 :     bp += nbbits_signs;
     349             : 
     350             :     /* write residual Quantization bits */
     351      202818 :     for ( k = 0; k < min( nbbits - bp - nbbits_lsbs, resQMaxBits ); k++ )
     352             :     {
     353      172209 :         ptr[nbbits - 1 - nbbits_lsbs - k] = x[nt + k];
     354             :     }
     355             : 
     356             :     /* Write filler bits */
     357      273163 :     for ( ; k < nbbits - bp - nbbits_lsbs; ++k )
     358             :     {
     359      242554 :         ptr[nbbits - 1 - nbbits_lsbs - k] = 0;
     360             :     }
     361             : 
     362             :     /* Check for debugging */
     363       30609 :     assert( bp + k <= nbbits );
     364             : 
     365             :     /* Push the rest of the buffer */
     366       30609 :     push_next_bits( hBstr, (uint16_t *) &ptr[bp], nbbits - bp );
     367             : 
     368             : #ifdef DEBUGGING
     369             :     /* return (bp+nbbits_lsbs);*/ /*return only for debug plot*/
     370             : #endif
     371       30609 :     return;
     372             : }
     373             : 
     374             : /*-------------------------------------------------------------------*
     375             :  * find_last_nz_pair()
     376             :  *
     377             :  *
     378             :  *-------------------------------------------------------------------*/
     379             : 
     380     5085752 : static int16_t find_last_nz_pair(
     381             :     const int16_t x[],
     382             :     const int16_t length,
     383             :     const CONTEXT_HM_CONFIG *hm_cfg )
     384             : {
     385             :     int16_t last_nz, i;
     386             :     const int16_t *tmp;
     387             : 
     388     5085752 :     last_nz = 2;
     389             : 
     390     5085752 :     if ( hm_cfg )
     391             :     {
     392             :         /* mapped kernel */
     393     4942404 :         tmp = hm_cfg->indexBuffer;
     394             : 
     395   948877130 :         for ( i = length; i >= 4; i -= 2 )
     396             :         {
     397             : 
     398   948318219 :             if ( x[tmp[i - 2]] != 0 || x[tmp[i - 1]] != 0 )
     399             :             {
     400     4383493 :                 last_nz = i;
     401     4383493 :                 break;
     402             :             }
     403             :         }
     404             :     }
     405             :     else
     406             :     {
     407             :         /* unmapped kernel */
     408             : 
     409    20844561 :         for ( i = length; i >= 4; i -= 2 )
     410             :         {
     411             : 
     412    20843641 :             if ( x[i - 2] != 0 || x[i - 1] != 0 )
     413             :             {
     414      142428 :                 last_nz = i;
     415      142428 :                 break;
     416             :             }
     417             :         }
     418             :     }
     419             : 
     420     5085752 :     return last_nz;
     421             : }
     422             : 
     423             : 
     424             : /*-------------------------------------------------------------------*
     425             :  * ACcontextMapping_encode2_estimate_no_mem_s17_LC()
     426             :  *
     427             :  *
     428             :  *-------------------------------------------------------------------*/
     429             : 
     430      199737 : int16_t ACcontextMapping_encode2_estimate_no_mem_s17_LC(
     431             :     const int16_t *x,
     432             :     const int16_t nt,
     433             :     int16_t *lastnz_out,
     434             :     int16_t *nEncoded,
     435             :     const int16_t target,
     436             :     int16_t *stop,
     437             :     CONTEXT_HM_CONFIG *hm_cfg )
     438             : {
     439             :     int16_t a1, b1, a1_i, b1_i;
     440             :     int16_t k, pki, lev1;
     441             :     uint16_t t;
     442             :     int16_t lastnz, lastnz2;
     443             :     int16_t rateFlag;
     444             :     int16_t nbits_old, nbits;
     445             :     int16_t stop2;
     446             :     int32_t proba;
     447             :     int16_t nlz;
     448             :     const uint16_t *cum_freq;
     449             :     int16_t symbol;
     450             :     const uint8_t *lookup;
     451             :     int16_t nt_half;
     452             :     int32_t c[2], *ctx;
     453             :     int32_t p1, p2;
     454             :     int16_t ii[2];
     455             :     int16_t idx1, idx2, idx;
     456      199737 :     int16_t numPeakIndicesOrig = 0, numHoleIndices = 0; /* only to avoid compiler warning */
     457             : 
     458             :     /* Rate flag */
     459      199737 :     if ( target > 400 )
     460             :     {
     461       90045 :         rateFlag = 2 << NBITS_CONTEXT;
     462             :     }
     463             :     else
     464             :     {
     465      109692 :         rateFlag = 0;
     466             :     }
     467             : 
     468             :     /* 2 bits = arithmetic coder initialization interval = 1 bits for rounding last proba + 1 bit?*/
     469      199737 :     nbits = 2;
     470             :     /*proba coded on 14bits -> proba=1*/
     471      199737 :     proba = 16384;
     472             : 
     473             :     /* Init */
     474      199737 :     nt_half = nt >> 1;
     475      199737 :     stop2 = 0;
     476      199737 :     c[0] = c[1] = 0;
     477             : 
     478             :     /* bits to encode lastnz */
     479      199737 :     k = 1;
     480             : 
     481     1942123 :     while ( k < nt / 2 )
     482             :     {
     483     1742386 :         nbits++;
     484     1742386 :         k = k << 1;
     485             :         /* check while condition */
     486             :     }
     487      199737 :     nbits_old = nbits;
     488             : 
     489      199737 :     nbits -= target;
     490             : 
     491             :     /* Find last non-zero tuple in the mapped domain signal */
     492      199737 :     lastnz = find_last_nz_pair( x, nt, hm_cfg );
     493             : 
     494             :     /* At least one tuple is coded */
     495      199737 :     lastnz2 = 2;
     496             : 
     497      199737 :     if ( hm_cfg )
     498             :     {
     499             :         /* mapped domain */
     500       56389 :         numPeakIndicesOrig = hm_cfg->numPeakIndices;
     501       56389 :         hm_cfg->numPeakIndices = min( hm_cfg->numPeakIndices, lastnz );
     502       56389 :         numHoleIndices = lastnz - hm_cfg->numPeakIndices;
     503             : 
     504             :         /* Mark hole indices beyond lastnz as pruned */
     505    12777463 :         for ( k = numHoleIndices; k < hm_cfg->numHoleIndices; ++k )
     506             :         {
     507    12721074 :             hm_cfg->holeIndices[k] = hm_cfg->holeIndices[k] + nt;
     508             :         }
     509             : 
     510       56389 :         ii[0] = numPeakIndicesOrig;
     511       56389 :         ii[1] = 0;
     512             : 
     513       56389 :         p1 = p2 = 0; /* to avoid compilation warnings */
     514             :     }
     515             :     else
     516             :     {
     517             :         /* unmapped domain */
     518      143348 :         ii[0] = 0;
     519             : 
     520      143348 :         p1 = p2 = 0;
     521             :     }
     522             : 
     523             :     /* Main Loop through the 2-tuples */
     524    30846045 :     for ( k = 0; k < lastnz; k += 2 )
     525             :     {
     526    30667473 :         if ( hm_cfg )
     527             :         {
     528     8593771 :             a1_i = get_next_coeff_mapped( ii, &p1, &idx1, hm_cfg );
     529     8593771 :             b1_i = get_next_coeff_mapped( ii, &p2, &idx2, hm_cfg );
     530             :         }
     531             :         else
     532             :         {
     533    22073702 :             a1_i = get_next_coeff_unmapped( ii, &idx1 );
     534    22073702 :             b1_i = get_next_coeff_unmapped( ii, &idx2 );
     535             :         }
     536             : 
     537    30667473 :         idx = min( idx1, idx2 );
     538             : 
     539             :         /* Get context */
     540    30667473 :         ctx = &c[p1 | p2];
     541             : 
     542    30667473 :         t = (uint16_t) ( *ctx + rateFlag );
     543    30667473 :         t += ( nt_half >= idx ) ? 0 : ( 1 << NBITS_CONTEXT );
     544             : 
     545             :         /* Init current 2-tuple encoding */
     546    30667473 :         a1 = (int16_t) abs( x[a1_i] );
     547    30667473 :         b1 = (int16_t) abs( x[b1_i] );
     548    30667473 :         lev1 = -( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
     549             : 
     550             :         /* Signs Bits */
     551    30667473 :         nbits += min( a1, 1 );
     552    30667473 :         nbits += min( b1, 1 );
     553             : 
     554             :         /* pre-compute address of ari_pk_s17_LC_ext[0][Val_esc] to avoid doing it multiple times inside the loop */
     555    30667473 :         lookup = &ari_lookup_s17_LC[t] + ( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
     556             : 
     557             :         /* check while condition */
     558             :         /* MSBs coding */
     559    38216310 :         while ( max( a1, b1 ) >= A_THRES )
     560             :         {
     561     7548837 :             pki = lookup[lev1];
     562     7548837 :             cum_freq = ari_pk_s17_LC_ext[pki] + VAL_ESC;
     563             :             /*p1*p2=proba on 28 bits: p=0.5->power(2,27)*/
     564     7548837 :             proba *= *( cum_freq );
     565             :             /*Number of leading zero computed in one cycle=norm_l() in BASOP*/
     566     7548837 :             nlz = 2;
     567    17229627 :             while ( proba < 134217728 ) /*power(2,27)*/
     568             :             {
     569     9680790 :                 nlz++;
     570     9680790 :                 proba = proba << 1;
     571             :             }
     572     7548837 :             nbits += nlz;
     573             :             /*addition added as shift not done in norm_l(): real shift = 14-nlz*/
     574     7548837 :             proba >>= 14; /*proba is rounded down on 14 bits ->automatic over-estimation of bit consumption*/
     575             : 
     576     7548837 :             ( a1 ) >>= 1;
     577     7548837 :             ( b1 ) >>= 1;
     578             : 
     579     7548837 :             lev1 = min( lev1 + ( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) ), 2 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
     580             :             /* check while condition */
     581             :         }
     582    30667473 :         pki = lookup[lev1];
     583    30667473 :         symbol = a1 + A_THRES * b1;
     584    30667473 :         cum_freq = ari_pk_s17_LC_ext[pki] + symbol;
     585             :         /*p1*p2=proba on 28 bits: p=0.5->power(2,27)*/
     586    30667473 :         proba *= ( cum_freq[0] - cum_freq[1] );
     587             :         /*Number of leading zero computed in one cycle=norm_l() in BASOP*/
     588    30667473 :         nlz = 0;
     589   109546835 :         while ( proba < 134217728 ) /*power(2,27)*/
     590             :         {
     591    78879362 :             nlz++;
     592    78879362 :             proba = proba << 1;
     593             :         }
     594             : 
     595    30667473 :         nbits += nlz;
     596    30667473 :         proba >>= 14; /*proba is rounded down on 14 bits ->automatic over-estimation of bit consumption*/
     597             : 
     598             :         /* Should we truncate? */
     599    30667473 :         if ( nbits > 0 )
     600             :         {
     601     1699031 :             stop2 = 1;
     602             : 
     603     1699031 :             if ( *stop )
     604             :             {
     605       21165 :                 break;
     606             :             }
     607             :         }
     608             :         else
     609             :         {
     610    28968442 :             if ( hm_cfg || k == 0 || x[a1_i] || x[b1_i] )
     611             :             {
     612    20895760 :                 nbits_old = nbits + target;
     613    20895760 :                 lastnz2 = b1_i + 1;
     614             :             }
     615             :         }
     616             : 
     617             :         /* Update context for next 2-tuple */
     618    30646308 :         if ( p1 == p2 ) /* peak-peak or hole-hole context */
     619             :         {
     620    29217346 :             lev1 >>= NBITS_CONTEXT + NBITS_RATEQ;
     621             : 
     622    29217346 :             if ( lev1 <= 0 )
     623             :             {
     624    27244170 :                 t = 1 + ( a1 + b1 ) * ( lev1 + 2 );
     625             :             }
     626             :             else
     627             :             {
     628     1973176 :                 t = 13 + lev1;
     629             :             }
     630             : 
     631    29217346 :             *ctx = ( *ctx & 0xf ) * 16 + t;
     632             :         }
     633             :         else
     634             :         {
     635             :             /* mixed context */
     636             : 
     637     1428962 :             if ( idx1 & 1 )
     638             :             {
     639             :                 /* update first context */
     640      700941 :                 c[p1] = update_mixed_context( c[p1], (int16_t) abs( x[a1_i] ) );
     641             :             }
     642             : 
     643     1428962 :             if ( idx2 & 1 )
     644             :             {
     645             :                 /* update second context */
     646      724831 :                 c[p2] = update_mixed_context( c[p2], (int16_t) abs( x[b1_i] ) );
     647             :             }
     648             :         }
     649             :     } /*end of the 2-tuples loop*/
     650             : 
     651      199737 :     nbits += target;
     652             : 
     653             :     /* Output */
     654             : 
     655      199737 :     if ( *stop )
     656             :     {
     657       23473 :         nbits = nbits_old;
     658             :     }
     659             : 
     660      199737 :     if ( stop2 )
     661             :     {
     662      108701 :         stop2 = nbits;
     663             :     }
     664      199737 :     *nEncoded = lastnz2;
     665      199737 :     *stop = stop2;
     666      199737 :     *lastnz_out = lastnz;
     667             : 
     668      199737 :     if ( hm_cfg )
     669             :     {
     670             :         /* Restore hole indices beyond lastnz */
     671    12777463 :         for ( k = numHoleIndices; k < hm_cfg->numHoleIndices; ++k )
     672             :         {
     673    12721074 :             hm_cfg->holeIndices[k] = hm_cfg->holeIndices[k] - nt;
     674             :         }
     675       56389 :         hm_cfg->numPeakIndices = numPeakIndicesOrig;
     676             :     }
     677             : 
     678      199737 :     return nbits_old;
     679             : }
     680             : 
     681             : 
     682             : /* Range Coder Functions */
     683             : 
     684             : /*-------------------------------------------------------------------*
     685             :  * RCcontextMapping_encode2_no_mem_s17_LCS()
     686             :  *
     687             :  * Range encoder
     688             :  *-------------------------------------------------------------------*/
     689             : 
     690    14519541 : void RCcontextMapping_encode2_no_mem_s17_LCS(
     691             :     BSTR_ENC_HANDLE hBstr, /* i/o: bitstream handle            */
     692             :     int16_t *x,
     693             :     const int16_t nt,
     694             :     int16_t lastnz,
     695             :     const int16_t nbbits,
     696             :     const int16_t resQMaxBits,
     697             :     CONTEXT_HM_CONFIG *hm_cfg )
     698             : {
     699             :     int16_t ptr[BITBUFSIZE];
     700             :     RangeUniEncState rc_st_enc;
     701             :     int16_t bp;
     702             :     int16_t rc_tot_bits; /* No. of bits returned by range coder */
     703             :     int16_t pki, lev1;
     704             :     uint16_t t;
     705             :     int16_t rateFlag;
     706             :     int16_t value;
     707             :     int16_t nbbits_ntuples, nbbits_lsbs, nbbits_signs;
     708             :     int16_t *lsbs_bits;
     709             :     int16_t nt_half;
     710             :     int16_t signs[N_MAX];
     711             :     int16_t a1, b1, k;
     712             : 
     713    14519541 :     a1 = 0; /* to avoid compilation warnings */
     714    14519541 :     b1 = 0; /* to avoid compilation warnings */
     715             : 
     716             :     /* Init */
     717    14519541 :     nt_half = nt >> 1;
     718             : 
     719             :     /* Bits for encoding the number of encoded tuples */
     720    14519541 :     nbbits_ntuples = 0;
     721    14519541 :     k = 1;
     722   142935102 :     while ( k < nt / 2 )
     723             :     {
     724   128415561 :         nbbits_ntuples++;
     725   128415561 :         k = k << 1;
     726             :     }
     727             : 
     728    14519541 :     t = 0;
     729    14519541 :     nbbits_signs = 0;
     730    14519541 :     nbbits_lsbs = 0;
     731             : 
     732    14519541 :     if ( hm_cfg )
     733             :     {
     734             :         int16_t a1_i, b1_i;
     735             :         int32_t c[2], *ctx;
     736             :         int32_t p1, p2;
     737             :         int16_t ii[2];
     738             :         int16_t idx1, idx2, idx;
     739             :         int16_t numPeakIndicesOrig, numHoleIndices;
     740             : 
     741             :         /* Rate flag */
     742      155604 :         if ( nbbits > 400 )
     743             :         {
     744       61907 :             rateFlag = 2 << NBITS_CONTEXT;
     745             :         }
     746             :         else
     747             :         {
     748       93697 :             rateFlag = 0;
     749             :         }
     750             : 
     751      155604 :         c[0] = c[1] = 0;
     752             : 
     753             :         /* mapped domain */
     754      155604 :         numPeakIndicesOrig = hm_cfg->numPeakIndices;
     755      155604 :         hm_cfg->numPeakIndices = min( hm_cfg->numPeakIndices, lastnz );
     756      155604 :         numHoleIndices = lastnz - hm_cfg->numPeakIndices;
     757             : 
     758             :         /* Mark hole indices beyond lastnz as pruned */
     759    55549420 :         for ( k = numHoleIndices; k < hm_cfg->numHoleIndices; ++k )
     760             :         {
     761    55393816 :             hm_cfg->holeIndices[k] = hm_cfg->holeIndices[k] + nt;
     762             :         }
     763             : 
     764      155604 :         ii[0] = numPeakIndicesOrig;
     765      155604 :         ii[1] = 0;
     766             : 
     767      155604 :         p1 = p2 = 0; /* to avoid compilation warnings */
     768             : 
     769      155604 :         lsbs_bits = ptr + nbbits - 1;
     770             : 
     771             :         /*Start Encoding*/
     772             :         /* Initialize range encoder */
     773      155604 :         rc_uni_enc_init( &rc_st_enc );
     774             : 
     775             :         /*Main Loop through the 2-tuples*/
     776      155604 :         b1_i = -1;
     777             : 
     778    26166416 :         for ( k = 0; k < lastnz; k += 2 )
     779             :         {
     780    26010812 :             a1_i = get_next_coeff_mapped( ii, &p1, &idx1, hm_cfg );
     781    26010812 :             b1_i = get_next_coeff_mapped( ii, &p2, &idx2, hm_cfg );
     782             : 
     783    26010812 :             idx = min( idx1, idx2 );
     784             : 
     785             :             /* Get context */
     786    26010812 :             ctx = &c[p1 | p2];
     787             : 
     788    26010812 :             t = (uint16_t) ( *ctx + rateFlag );
     789    26010812 :             t += ( nt_half >= idx ) ? 0 : ( 1 << NBITS_CONTEXT );
     790             : 
     791             :             /* Init current 2-tuple encoding */
     792    26010812 :             a1 = (int16_t) abs( x[a1_i] );
     793    26010812 :             b1 = (int16_t) abs( x[b1_i] );
     794             : 
     795    26010812 :             lev1 = -1;
     796             : 
     797             :             /*Signs encoding*/
     798    26010812 :             if ( a1 > 0 )
     799             :             {
     800     5682990 :                 signs[nbbits_signs++] = ( (uint16_t) x[a1_i] >> ( sizeof( uint16_t ) * 8 - 1 ) );
     801             :             }
     802             : 
     803    26010812 :             if ( b1 > 0 )
     804             :             {
     805     5653944 :                 signs[nbbits_signs++] = ( (uint16_t) x[b1_i] >> ( sizeof( uint16_t ) * 8 - 1 ) );
     806             :             }
     807             : 
     808             :             /* MSBs coding */
     809    28464107 :             while ( max( a1, b1 ) >= A_THRES )
     810             :             {
     811     2453295 :                 pki = ari_lookup_s17_LC[t + ( ( lev1 + 1 ) << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
     812     2453295 :                 rc_uni_enc_encode_symbol_fastS( &rc_st_enc, VAL_ESC, cum_freq_ari_pk_s17_LC_ext[pki], sym_freq_ari_pk_s17_LC_ext[pki], 14 ); /* Encode ESC symbol */
     813             : 
     814     2453295 :                 *lsbs_bits-- = a1 & 1;
     815     2453295 :                 *lsbs_bits-- = b1 & 1;
     816             : 
     817             :                 /* LSBs bit counting */
     818     2453295 :                 nbbits_lsbs += 2;
     819             : 
     820     2453295 :                 a1 >>= 1;
     821     2453295 :                 b1 >>= 1;
     822             : 
     823     2453295 :                 lev1 = min( lev1 + 1, 2 );
     824             :             }
     825             : 
     826    26010812 :             pki = ari_lookup_s17_LC[t + ( ( lev1 + 1 ) << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
     827    26010812 :             rc_uni_enc_encode_symbol_fastS( &rc_st_enc, a1 + A_THRES * b1, cum_freq_ari_pk_s17_LC_ext[pki], sym_freq_ari_pk_s17_LC_ext[pki], 14 ); /* Encode MSB symbol */
     828             : 
     829             :             /*Confirm that there is no overflow, i.e. bit-budget has not exceeded */
     830             : #ifdef DEBUGGING
     831             :             assert( rc_uni_enc_virtual_finish( &rc_st_enc ) <= nbbits - nbbits_signs - nbbits_lsbs - nbbits_ntuples );
     832             : #endif
     833             : 
     834             :             /* Update context for next 2-tuple */
     835    26010812 :             if ( p1 == p2 )
     836             :             {
     837             :                 /* peak-peak or hole-hole context */
     838             : 
     839    23641358 :                 if ( lev1 <= 0 )
     840             :                 {
     841    23191464 :                     t = 1 + ( a1 + b1 ) * ( lev1 + 2 );
     842             :                 }
     843             :                 else
     844             :                 {
     845      449894 :                     t = 13 + lev1;
     846             :                 }
     847             : 
     848    23641358 :                 *ctx = ( *ctx & 0xf ) * 16 + t;
     849             :             }
     850             :             else
     851             :             {
     852             :                 /* mixed context */
     853             : 
     854     2369454 :                 if ( idx1 & 1 )
     855             :                 {
     856             :                     /* update first context */
     857     1168625 :                     c[p1] = update_mixed_context( c[p1], (int16_t) abs( x[a1_i] ) );
     858             :                 }
     859             : 
     860     2369454 :                 if ( idx2 & 1 )
     861             :                 {
     862             :                     /* update second context */
     863     1200829 :                     c[p2] = update_mixed_context( c[p2], (int16_t) abs( x[b1_i] ) );
     864             :                 }
     865             :             }
     866             : 
     867             :         } /*end of the 2-tuples loop*/
     868             :     }
     869             :     else /* if (!hm_cfg) */
     870             :     {
     871             :         int16_t cp;
     872             :         int16_t esc_nb, rateQ;
     873             :         uint16_t s;
     874             : 
     875             :         /* Rate flag */
     876    14363937 :         if ( nbbits > 400 )
     877             :         {
     878    10066953 :             rateFlag = 2;
     879             :         }
     880             :         else
     881             :         {
     882     4296984 :             rateFlag = 0;
     883             :         }
     884             : 
     885    14363937 :         s = 0;
     886             : 
     887             :         /* Find last non-zero tuple */
     888             :         /* ensure termination of while loop by dummy value */
     889    14363937 :         a1 = x[0];
     890    14363937 :         x[0] = 1; /* ensure first tuple is non-zero */
     891             : 
     892   116330760 :         while ( x[lastnz - 1] == 0 && x[lastnz - 2] == 0 )
     893             :         {
     894   101966823 :             lastnz -= 2;
     895             :         }
     896    14363937 :         x[0] = a1;
     897             : 
     898    14363937 :         lsbs_bits = ptr + nbbits - 1;
     899             : 
     900             :         /*Start Encoding*/
     901             :         /* Initialize range encoder */
     902    14363937 :         rc_uni_enc_init( &rc_st_enc );
     903             : 
     904             :         /*Main Loop through the 2-tuples*/
     905  2987533410 :         for ( k = 0; k < lastnz; k += 2 )
     906             :         {
     907             : 
     908             :             /* Init current 2-tuple encoding */
     909  2973169473 :             a1 = (int16_t) abs( x[k + 0] );
     910  2973169473 :             b1 = (int16_t) abs( x[k + 1] );
     911             : 
     912  2973169473 :             lev1 = 0;
     913  2973169473 :             esc_nb = 0;
     914             : 
     915             :             /*Signs encoding*/
     916  2973169473 :             if ( a1 > 0 )
     917             :             {
     918  1157586794 :                 signs[nbbits_signs++] = ( (uint16_t) x[k + 0] >> ( sizeof( uint16_t ) * 8 - 1 ) );
     919             :             }
     920             : 
     921  2973169473 :             if ( b1 > 0 )
     922             :             {
     923  1157934294 :                 signs[nbbits_signs++] = ( (uint16_t) x[k + 1] >> ( sizeof( uint16_t ) * 8 - 1 ) );
     924             :             }
     925             : 
     926  2973169473 :             rateQ = rateFlag + ( k > ( nt >> 1 ) );
     927             : 
     928             :             /* MSBs coding */
     929  3587907908 :             while ( max( a1, b1 ) >= A_THRES )
     930             :             {
     931   614738435 :                 pki = ari_lookup_s17_LC[t + ( ( rateQ ) << NBITS_CONTEXT ) + ( esc_nb << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
     932   614738435 :                 rc_uni_enc_encode_symbol_fastS( &rc_st_enc, VAL_ESC, cum_freq_ari_pk_s17_LC_ext[pki], sym_freq_ari_pk_s17_LC_ext[pki], 14 ); /* Encode ESC symbol */
     933             : 
     934   614738435 :                 *lsbs_bits-- = a1 & 1;
     935   614738435 :                 *lsbs_bits-- = b1 & 1;
     936             : 
     937             :                 /* LSBs bit counting */
     938   614738435 :                 nbbits_lsbs += 2;
     939             : 
     940   614738435 :                 a1 >>= 1;
     941   614738435 :                 b1 >>= 1;
     942             : 
     943   614738435 :                 lev1++;
     944   614738435 :                 esc_nb = min( lev1, 3 );
     945             :             }
     946             : 
     947  2973169473 :             pki = ari_lookup_s17_LC[t + ( ( rateQ ) << NBITS_CONTEXT ) + ( esc_nb << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
     948  2973169473 :             rc_uni_enc_encode_symbol_fastS( &rc_st_enc, a1 + A_THRES * b1, cum_freq_ari_pk_s17_LC_ext[pki], sym_freq_ari_pk_s17_LC_ext[pki], 14 ); /* Encode MSB symbol */
     949             : 
     950             :             /*Confirm that there is no overflow, i.e. bit-budget has not exceeded */
     951             : #ifdef DEBUGGING
     952             :             assert( rc_uni_enc_virtual_finish( &rc_st_enc ) <= nbbits - nbbits_signs - nbbits_lsbs - nbbits_ntuples );
     953             : #endif
     954             : 
     955             :             /* Update context for next 2-tuple */
     956  2973169473 :             if ( esc_nb < 2 )
     957             :             {
     958  2819564065 :                 cp = 1 + ( ( a1 + b1 ) * ( esc_nb + 1 ) );
     959             :             }
     960             :             else
     961             :             {
     962   153605408 :                 cp = 12 + esc_nb;
     963             :             }
     964             : 
     965             :             /*Shift old 4 bits, replace last 4 bits*/
     966  2973169473 :             s = s & 0x0F;
     967  2973169473 :             s = ( s << 4 ) + cp;
     968  2973169473 :             t = s & 0xFF;
     969             : 
     970             :         } /*end of the 2-tuples loop*/
     971             :     }
     972             : 
     973             :     /* Finish range encoder */
     974    14519541 :     rc_tot_bits = rc_uni_enc_finish( &rc_st_enc ); /* No. of bits consumed by range coder */
     975    14519541 :     bp = rc_tot_bits + nbbits_ntuples;             /* Update bitstream pointer */
     976             : 
     977             :     /* Cross-check that there is no overflow */
     978             : #ifdef DEBUGGING
     979             :     assert( k == lastnz );
     980             : #endif
     981             : 
     982             :     /* Push number of encoded tuples */
     983    14519541 :     value = ( lastnz >> 1 ) - 1;
     984    14519541 :     push_next_indice( hBstr, value, nbbits_ntuples );
     985             : 
     986             :     /* Push range coded bits from byte_buffer to bitstream */
     987             :     /* 1) Push all complete bytes, one byte at a time */
     988  1044364365 :     for ( k = 0; k < ( rc_tot_bits >> 3 ); k++ )
     989             :     {
     990  1029844824 :         push_next_indice( hBstr, rc_st_enc.byte_buffer[k], 8 );
     991             :     }
     992             :     /* 2) Push remaining bits */
     993    14519541 :     if ( ( rc_tot_bits & 7 ) != 0 )
     994             :     {
     995    12743146 :         push_next_indice( hBstr, rc_st_enc.byte_buffer[k] >> ( 8 - ( rc_tot_bits & 7 ) ), rc_tot_bits & 7 );
     996             :     }
     997             : 
     998             :     /* Push sign bits */
     999    14519541 :     push_next_bits( hBstr, (uint16_t *) signs, nbbits_signs );
    1000    14519541 :     bp += nbbits_signs;
    1001             : 
    1002             :     /*write residual Quantization bits*/
    1003             : 
    1004   120447760 :     for ( k = 0; k < min( nbbits - bp - nbbits_lsbs, resQMaxBits ); k++ )
    1005             :     {
    1006   105928219 :         ptr[nbbits - 1 - nbbits_lsbs - k] = x[nt + k];
    1007             :     }
    1008             :     /* Write filler bits */
    1009   797757208 :     for ( ; k < nbbits - bp - nbbits_lsbs; ++k )
    1010             :     {
    1011   783237667 :         ptr[nbbits - 1 - nbbits_lsbs - k] = 0;
    1012             :     }
    1013             : 
    1014             :     /* Check for debugging */
    1015    14519541 :     assert( bp + k <= nbbits );
    1016             : 
    1017             :     /* Push the rest of the buffer */
    1018    14519541 :     push_next_bits( hBstr, (uint16_t *) &ptr[bp], nbbits - bp );
    1019             : 
    1020             :     /* return (bp+nbbits_lsbs);*/ /*return only for debug plot*/
    1021    14519541 :     return;
    1022             : }
    1023             : 
    1024             : /*-------------------------------------------------------------------*
    1025             :  * RCcontextMapping_encode2_estimate_no_mem_s17_LCS()
    1026             :  *
    1027             :  * Range coder bit-estimation
    1028             :  *-------------------------------------------------------------------*/
    1029             : 
    1030    64303729 : int16_t RCcontextMapping_encode2_estimate_no_mem_s17_LCS(
    1031             :     int16_t *x,       /* Spectral coefficients */
    1032             :     const int16_t nt, /* L - size of spectrum (no. of spectral coefficients) */
    1033             :     int16_t *lastnz_out,
    1034             :     int16_t *nEncoded,    /* No. of spectral coefficients that can be coded without an overflow occuring */
    1035             :     const int16_t target, /* Target bits */
    1036             :     int16_t *stop,
    1037             :     int16_t mode,
    1038             :     CONTEXT_HM_CONFIG *hm_cfg /* context-based harmonic model configuration */
    1039             : )
    1040             : {
    1041             :     /* Common variables */
    1042             :     int16_t a1, b1;
    1043             :     int16_t k, pki, lev1;
    1044             :     uint16_t t;
    1045             :     int16_t lastnz, lastnz2;
    1046             :     int16_t rateFlag;
    1047             :     float bit_estimate;
    1048             :     int16_t symbol;
    1049             :     const uint8_t *lookup;
    1050             :     float nbits2;
    1051             : 
    1052             :     /* Initialization */
    1053    64303729 :     bit_estimate = 2.0f;
    1054    64303729 :     nbits2 = 0.f;
    1055             : 
    1056             :     /* bits to encode lastnz */
    1057    64303729 :     k = 1;
    1058             : 
    1059   627947667 :     while ( k < nt / 2 )
    1060             :     {
    1061   563643938 :         bit_estimate++;
    1062   563643938 :         k = k << 1;
    1063             :         /* check while condition */
    1064             :     }
    1065             : 
    1066    64303729 :     nbits2 = bit_estimate;
    1067             : 
    1068    64303729 :     if ( hm_cfg )
    1069             :     {
    1070             :         int16_t a1_i, b1_i;
    1071             :         int16_t stop2;
    1072             :         int16_t total_output_bits;
    1073             :         int16_t nt_half;
    1074             :         int32_t c[2], *ctx;
    1075             :         int32_t p1, p2;
    1076             :         int16_t ii[2];
    1077             :         int16_t idx1, idx2, idx;
    1078     4886015 :         int16_t numPeakIndicesOrig = 0, numHoleIndices = 0; /* only to avoid compiler warning */
    1079             : 
    1080             :         /* Rate flag */
    1081     4886015 :         if ( target > 400 )
    1082             :         {
    1083     2637781 :             rateFlag = 2 << NBITS_CONTEXT; /* Select context-A for higher bitrates */
    1084             :         }
    1085             :         else
    1086             :         {
    1087     2248234 :             rateFlag = 0; /* Select context-B for lower bitrates */
    1088             :         }
    1089             : 
    1090     4886015 :         nt_half = nt >> 1;
    1091     4886015 :         stop2 = 0;
    1092     4886015 :         c[0] = c[1] = 0;
    1093             : 
    1094             :         /* Find last non-zero tuple in the mapped domain signal */
    1095     4886015 :         lastnz = find_last_nz_pair( x, nt, hm_cfg );
    1096             : 
    1097     4886015 :         lastnz2 = 2;
    1098             : 
    1099             :         /* mapped domain */
    1100     4886015 :         numPeakIndicesOrig = hm_cfg->numPeakIndices;
    1101     4886015 :         hm_cfg->numPeakIndices = min( hm_cfg->numPeakIndices, lastnz );
    1102     4886015 :         numHoleIndices = lastnz - hm_cfg->numPeakIndices;
    1103             : 
    1104             :         /* Mark hole indices beyond lastnz as pruned */
    1105  1675597040 :         for ( k = numHoleIndices; k < hm_cfg->numHoleIndices; ++k )
    1106             :         {
    1107  1670711025 :             hm_cfg->holeIndices[k] = hm_cfg->holeIndices[k] + nt;
    1108             :         }
    1109             : 
    1110     4886015 :         ii[0] = numPeakIndicesOrig;
    1111     4886015 :         ii[1] = 0;
    1112             : 
    1113     4886015 :         p1 = p2 = 0; /* to avoid compilation warnings */
    1114             : 
    1115             :         /* Main Loop through the 2-tuples */
    1116   858961531 :         for ( k = 0; k < lastnz; k += 2 )
    1117             :         {
    1118   855684736 :             a1_i = get_next_coeff_mapped( ii, &p1, &idx1, hm_cfg );
    1119   855684736 :             b1_i = get_next_coeff_mapped( ii, &p2, &idx2, hm_cfg );
    1120             : 
    1121   855684736 :             idx = min( idx1, idx2 );
    1122             : 
    1123             :             /* Get context */
    1124   855684736 :             ctx = &c[p1 | p2];
    1125             : 
    1126   855684736 :             t = (uint16_t) ( *ctx + rateFlag );
    1127   855684736 :             t += ( nt_half >= idx ) ? 0 : ( 1 << NBITS_CONTEXT );
    1128             : 
    1129             :             /* Init current 2-tuple encoding */
    1130   855684736 :             a1 = (int16_t) abs( x[a1_i] );
    1131   855684736 :             b1 = (int16_t) abs( x[b1_i] );
    1132   855684736 :             lev1 = -( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
    1133             : 
    1134             :             /* Signs Bits */
    1135   855684736 :             bit_estimate += min( a1, 1 );
    1136   855684736 :             bit_estimate += min( b1, 1 );
    1137             : 
    1138             :             /* pre-compute address of ari_pk_s17_LC_ext[0][Val_esc] to avoid doing it multiple times inside the loop */
    1139   855684736 :             lookup = &ari_lookup_s17_LC[t] + ( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
    1140             : 
    1141             :             /* check while condition */
    1142             :             /* MSBs coding */
    1143   950113506 :             while ( max( a1, b1 ) >= A_THRES )
    1144             :             {
    1145    94428770 :                 pki = lookup[lev1]; /* ESC symbol */
    1146             : 
    1147    94428770 :                 bit_estimate = bit_estimate + ari_bit_estimate_s17_LC[pki][VAL_ESC];
    1148    94428770 :                 bit_estimate += 2; /* Add 2 LSB bits corresponding to the bit-plane */
    1149             : 
    1150    94428770 :                 ( a1 ) >>= 1;
    1151    94428770 :                 ( b1 ) >>= 1;
    1152             : 
    1153    94428770 :                 lev1 = min( lev1 + ( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) ), 2 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
    1154             : 
    1155             :                 /* check while condition */
    1156             :             }
    1157             : 
    1158   855684736 :             pki = lookup[lev1];
    1159             : 
    1160   855684736 :             symbol = a1 + A_THRES * b1;
    1161   855684736 :             bit_estimate = bit_estimate + ari_bit_estimate_s17_LC[pki][symbol];
    1162             : 
    1163             :             /* Should we truncate? */
    1164   855684736 :             if ( bit_estimate > target )
    1165             :             {
    1166   119250124 :                 stop2 = 1;
    1167             : 
    1168   119250124 :                 if ( *stop )
    1169             :                 {
    1170     1609220 :                     break;
    1171             :                 }
    1172             :             }
    1173             :             else
    1174             :             {
    1175   736434612 :                 lastnz2 = b1_i + 1;
    1176   736434612 :                 nbits2 = bit_estimate;
    1177             :             }
    1178             : 
    1179             :             /* Update context for next 2-tuple */
    1180   854075516 :             if ( p1 == p2 ) /* peak-peak or hole-hole context */
    1181             :             {
    1182   716648525 :                 lev1 >>= NBITS_CONTEXT + NBITS_RATEQ;
    1183             : 
    1184   716648525 :                 if ( lev1 <= 0 )
    1185             :                 {
    1186   699443122 :                     t = 1 + ( a1 + b1 ) * ( lev1 + 2 );
    1187             :                 }
    1188             :                 else
    1189             :                 {
    1190    17205403 :                     t = 13 + lev1;
    1191             :                 }
    1192             : 
    1193   716648525 :                 *ctx = ( *ctx & 0xf ) * 16 + t;
    1194             :             }
    1195             :             else
    1196             :             {
    1197             :                 /* mixed context */
    1198             : 
    1199   137426991 :                 if ( idx1 & 1 )
    1200             :                 {
    1201             :                     /* update first context */
    1202    68427883 :                     c[p1] = update_mixed_context( c[p1], (int16_t) abs( x[a1_i] ) );
    1203             :                 }
    1204             : 
    1205   137426991 :                 if ( idx2 & 1 )
    1206             :                 {
    1207             :                     /* update second context */
    1208    68737308 :                     c[p2] = update_mixed_context( c[p2], (int16_t) abs( x[b1_i] ) );
    1209             :                 }
    1210             :             }
    1211             : 
    1212             :         } /*end of the 2-tuples loop*/
    1213             : 
    1214     4886015 :         total_output_bits = (int16_t) ( bit_estimate + 0.5f );
    1215     4886015 :         if ( *stop )
    1216             :         {
    1217     2106245 :             total_output_bits = (int16_t) ( nbits2 + 0.5f );
    1218             :         }
    1219             : 
    1220     4886015 :         if ( stop2 )
    1221             :         {
    1222     3221957 :             stop2 = total_output_bits;
    1223             :         }
    1224     4886015 :         *nEncoded = lastnz2;
    1225     4886015 :         *stop = stop2; /* If zero, it means no overflow occured during bit-estimation */
    1226     4886015 :         *lastnz_out = lastnz;
    1227             : 
    1228             :         /* Restore hole indices beyond lastnz */
    1229  1675597040 :         for ( k = numHoleIndices; k < hm_cfg->numHoleIndices; ++k )
    1230             :         {
    1231  1670711025 :             hm_cfg->holeIndices[k] = hm_cfg->holeIndices[k] - nt;
    1232             :         }
    1233     4886015 :         hm_cfg->numPeakIndices = numPeakIndicesOrig;
    1234             : 
    1235     4886015 :         return (int16_t) ( nbits2 + 0.5f );
    1236             :     }
    1237             :     else /* if (!hm_cfg) */
    1238             :     {
    1239             :         int16_t esc_nb, cp, rateQ;
    1240             :         uint16_t s;
    1241             :         int16_t tot_bits2;
    1242    59417714 :         int16_t overflow_flag = 0;
    1243             : 
    1244             :         /* Rate flag */
    1245    59417714 :         if ( target > 400 )
    1246             :         {
    1247    44248794 :             rateFlag = 2;
    1248             :         }
    1249             :         else
    1250             :         {
    1251    15168920 :             rateFlag = 0; /* Select context-B for lower bitrates */
    1252             :         }
    1253             : 
    1254    59417714 :         t = 0;
    1255    59417714 :         s = 0;
    1256    59417714 :         cp = 0;
    1257    59417714 :         lastnz = 1;
    1258    59417714 :         lastnz2 = 0;
    1259    59417714 :         tot_bits2 = 0;
    1260             : 
    1261             :         /* Find last non-zero tuple in the mapped domain signal */
    1262  9888967854 :         for ( lastnz = ( nt - 2 ); lastnz >= 0; lastnz -= 2 )
    1263             :         {
    1264  9887155188 :             if ( ( x[lastnz] != 0 ) || ( x[lastnz + 1] != 0 ) )
    1265             :             {
    1266             :                 break;
    1267             :             }
    1268             :         }
    1269    59417714 :         lastnz += 2;
    1270    59417714 :         if ( lastnz < 2 )
    1271             :         {
    1272     1812666 :             lastnz = 2; /* At least one tuple is coded */
    1273             :         }
    1274             : 
    1275    59417714 :         lastnz2 = 2;
    1276             : 
    1277             :         /* Main Loop through the 2-tuples */
    1278 12640215080 :         for ( k = 0; k < lastnz; k += 2 )
    1279             :         {
    1280             :             /* Init current 2-tuple encoding */
    1281 12580797366 :             a1 = (int16_t) abs( x[k] );
    1282 12580797366 :             b1 = (int16_t) abs( x[k + 1] );
    1283 12580797366 :             lev1 = 0;
    1284 12580797366 :             esc_nb = 0;
    1285 12580797366 :             rateQ = rateFlag + ( k > ( nt >> 1 ) );
    1286             : 
    1287             :             /* Signs Bits */
    1288 12580797366 :             bit_estimate += min( a1, 1 );
    1289 12580797366 :             bit_estimate += min( b1, 1 );
    1290             : 
    1291             :             /* pre-compute address of ari_pk_s17_LC_ext[0][Val_esc] to avoid doing it multiple times inside the loop */
    1292 12580797366 :             lookup = &ari_lookup_s17_LC[t + ( rateQ << NBITS_CONTEXT )];
    1293             : 
    1294             :             /* check while condition */
    1295             :             /* MSBs coding */
    1296 15317701743 :             while ( max( a1, b1 ) >= A_THRES )
    1297             :             {
    1298  2736904377 :                 pki = lookup[( esc_nb << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
    1299             : 
    1300  2736904377 :                 bit_estimate = bit_estimate + ari_bit_estimate_s17_LC[pki][VAL_ESC];
    1301  2736904377 :                 bit_estimate += 2; /* Add 2 LSB bits corresponding to the bit-plane */
    1302             : 
    1303  2736904377 :                 ( a1 ) >>= 1;
    1304  2736904377 :                 ( b1 ) >>= 1;
    1305             : 
    1306  2736904377 :                 lev1++;
    1307  2736904377 :                 esc_nb = min( lev1, 3 );
    1308             : 
    1309             :                 /* check while condition */
    1310             :             }
    1311             : 
    1312 12580797366 :             pki = lookup[( esc_nb << ( NBITS_CONTEXT + NBITS_RATEQ ) )];
    1313             : 
    1314 12580797366 :             symbol = a1 + A_THRES * b1;
    1315 12580797366 :             bit_estimate = bit_estimate + ari_bit_estimate_s17_LC[pki][symbol];
    1316             : 
    1317             :             /* Should we truncate? */
    1318 12580797366 :             if ( bit_estimate > target ) /* Overflow occured */
    1319             :             {
    1320   480675598 :                 overflow_flag = 1;
    1321             :             }
    1322             :             else
    1323             :             {
    1324 12100121768 :                 if ( abs( x[k] ) || abs( x[k + 1] ) ) /* No overflow & non-zero tuple */
    1325             :                 {
    1326  7058899357 :                     nbits2 = bit_estimate;
    1327  7058899357 :                     lastnz2 = k + 2;
    1328             :                 }
    1329             :             }
    1330             : 
    1331             :             /* Update context for next 2-tuple */
    1332 12580797366 :             if ( esc_nb < 2 )
    1333             :             {
    1334 11895447565 :                 cp = 1 + ( a1 + b1 ) * ( esc_nb + 1 );
    1335             :             }
    1336             :             else
    1337             :             {
    1338   685349801 :                 cp = 12 + esc_nb;
    1339             :             }
    1340             : 
    1341             :             /*shift old bits and replace last 4 bits*/
    1342 12580797366 :             s = s & 0x0F;
    1343 12580797366 :             s = ( s << 4 ) + cp;
    1344 12580797366 :             t = s & 0xFF;
    1345             : 
    1346             :         } /*end of the 2-tuples loop*/
    1347             : 
    1348    59417714 :         tot_bits2 = (int16_t) ( nbits2 + 0.5f );
    1349    59417714 :         if ( lastnz2 < lastnz ) /* Overflow occured because unable to code all tuples */
    1350             :         {
    1351    22660557 :             overflow_flag = 1;
    1352             :         }
    1353    59417714 :         if ( mode == -1 )
    1354             :         {
    1355           0 :             tot_bits2 = (int16_t) ( bit_estimate + 0.5f );
    1356             :         }
    1357    59417714 :         if ( overflow_flag == 0 ) /* No overflow */
    1358             :         {
    1359    36757157 :             *stop = 0;
    1360             :         }
    1361             :         else /* Overflow */
    1362             :         {
    1363    22660557 :             if ( *stop )
    1364             :             {
    1365      101117 :                 *stop = tot_bits2;
    1366             :             }
    1367             :             else
    1368             :             {
    1369    22559440 :                 *stop = (int16_t) ( bit_estimate + 0.5f );
    1370             :             }
    1371             :         }
    1372             : 
    1373    59417714 :         *lastnz_out = lastnz;
    1374    59417714 :         *nEncoded = lastnz2;
    1375             :         /* Safety mechanism to avoid overflow */
    1376    59417714 :         if ( lastnz2 == 2 && overflow_flag == 1 )
    1377             :         {
    1378      125937 :             for ( k = 0; k < lastnz2; k++ )
    1379             :             {
    1380       83958 :                 x[k] = 0;
    1381             :             }
    1382             :         }
    1383             : 
    1384    59417714 :         return tot_bits2;
    1385             :     }
    1386             : }
    1387             : 
    1388             : /*-------------------------------------------------------------------*
    1389             :  * RCcontextMapping_encode2_estimate_bandWise_start()
    1390             :  *
    1391             :  * Range coder - start bandwise bit-estimation
    1392             :  *-------------------------------------------------------------------*/
    1393             : 
    1394    11022416 : int16_t RCcontextMapping_encode2_estimate_bandWise_start(
    1395             :     int16_t *x,
    1396             :     const int16_t nt,
    1397             :     const int16_t target,
    1398             :     HANDLE_RC_CONTEXT_MEM hContextMem )
    1399             : {
    1400             :     int16_t i, k;
    1401             : 
    1402             :     /* Rate flag */
    1403    11022416 :     if ( target > 400 )
    1404             :     {
    1405    10806620 :         hContextMem->rateFlag = 2 << NBITS_CONTEXT;
    1406             :     }
    1407             :     else
    1408             :     {
    1409      215796 :         hContextMem->rateFlag = 0;
    1410             :     }
    1411             : 
    1412    11022416 :     hContextMem->bit_estimate = 2.0f;
    1413             : 
    1414             :     /* Init */
    1415    11022416 :     hContextMem->nt_half = nt >> 1;
    1416             : 
    1417             :     /* bits to encode lastnz */
    1418    11022416 :     k = 1;
    1419             : 
    1420   102725616 :     while ( k < hContextMem->nt_half )
    1421             :     {
    1422    91703200 :         hContextMem->bit_estimate++;
    1423             : 
    1424    91703200 :         k = k << 1;
    1425             :         /* check while condition */
    1426             :     }
    1427             : 
    1428             :     /* bits to encode lastnz */
    1429    11022416 :     hContextMem->nbits_old = (int16_t) hContextMem->bit_estimate;
    1430             : 
    1431    11022416 :     hContextMem->ctx = 0;
    1432    11022416 :     hContextMem->lastnz = 2;
    1433             : 
    1434             :     /* Find last non-zero tuple  */
    1435             : 
    1436   211308006 :     for ( i = nt; i >= 4; i -= 2 )
    1437             :     {
    1438             : 
    1439   211113335 :         if ( x[i - 2] != 0 || x[i - 1] != 0 )
    1440             :         {
    1441    10827745 :             hContextMem->lastnz = i;
    1442    10827745 :             break;
    1443             :         }
    1444             :     }
    1445             : 
    1446    11022416 :     return (int16_t) hContextMem->bit_estimate;
    1447             : }
    1448             : 
    1449             : /*-------------------------------------------------------------------*
    1450             :  * RCcontextMapping_encode2_estimate_bandWise()
    1451             :  *
    1452             :  * Range coder - bandwise bit-estimation
    1453             :  *-------------------------------------------------------------------*/
    1454             : 
    1455   424840780 : int16_t RCcontextMapping_encode2_estimate_bandWise(
    1456             :     int16_t *x,
    1457             :     const int16_t start_line,
    1458             :     const int16_t end_line,
    1459             :     HANDLE_RC_CONTEXT_MEM hContextMem )
    1460             : {
    1461             :     int16_t a1, b1, a1_i, b1_i;
    1462             :     int16_t k, pki, lev1;
    1463             :     uint16_t t;
    1464   424840780 :     int16_t bandBits = 0;
    1465             :     int16_t total_output_bits; /* No. of bits after finalization */
    1466             :     int16_t symbol;
    1467             :     const uint8_t *lookup;
    1468             :     int16_t idx;
    1469             : 
    1470             :     /* Main Loop through the 2-tuples */
    1471             :     /*hContextMem->nt_half = end_line >> 1;*/
    1472  3191986789 :     for ( k = start_line; k < min( hContextMem->lastnz, end_line ); k += 2 )
    1473             :     {
    1474  2767146009 :         a1_i = k;
    1475  2767146009 :         b1_i = k + 1;
    1476             : 
    1477  2767146009 :         idx = k;
    1478             : 
    1479             :         /* Get context */
    1480  2767146009 :         t = hContextMem->ctx + hContextMem->rateFlag;
    1481  2767146009 :         t += ( hContextMem->nt_half >= idx ) ? 0 : ( 1 << NBITS_CONTEXT );
    1482             : 
    1483             :         /* Init current 2-tuple encoding */
    1484  2767146009 :         a1 = (int16_t) abs( x[a1_i] );
    1485  2767146009 :         b1 = (int16_t) abs( x[b1_i] );
    1486  2767146009 :         lev1 = -( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
    1487             : 
    1488             :         /* Signs Bits */
    1489  2767146009 :         hContextMem->bit_estimate += min( a1, 1 );
    1490  2767146009 :         hContextMem->bit_estimate += min( b1, 1 );
    1491             : 
    1492             :         /* pre-compute address of ari_pk_s17_LC_ext[0][Val_esc] to avoid doing it multiple times inside the loop */
    1493  2767146009 :         lookup = &ari_lookup_s17_LC[t] + ( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
    1494             : 
    1495             :         /* check while condition */
    1496             :         /* MSBs coding */
    1497  3402874566 :         while ( max( a1, b1 ) >= A_THRES )
    1498             :         {
    1499   635728557 :             pki = lookup[lev1];
    1500   635728557 :             hContextMem->bit_estimate = hContextMem->bit_estimate + ari_bit_estimate_s17_LC[pki][VAL_ESC];
    1501   635728557 :             hContextMem->bit_estimate += 2; /* Add the 2 LSB bits that were shifted out */
    1502             : 
    1503   635728557 :             ( a1 ) >>= 1;
    1504   635728557 :             ( b1 ) >>= 1;
    1505             : 
    1506   635728557 :             lev1 = min( lev1 + ( 1 << ( NBITS_CONTEXT + NBITS_RATEQ ) ), 2 << ( NBITS_CONTEXT + NBITS_RATEQ ) );
    1507             :             /* check while condition */
    1508             :         }
    1509             : 
    1510  2767146009 :         pki = lookup[lev1];
    1511  2767146009 :         symbol = a1 + A_THRES * b1; /* MSB symbol */
    1512  2767146009 :         hContextMem->bit_estimate = hContextMem->bit_estimate + ari_bit_estimate_s17_LC[pki][symbol];
    1513             : 
    1514             :         /* Update context */
    1515  2767146009 :         lev1 >>= NBITS_CONTEXT + NBITS_RATEQ;
    1516             : 
    1517  2767146009 :         if ( lev1 <= 0 )
    1518             :         {
    1519  2608830505 :             t = 1 + ( a1 + b1 ) * ( lev1 + 2 );
    1520             :         }
    1521             :         else
    1522             :         {
    1523   158315504 :             t = 13 + lev1;
    1524             :         }
    1525             : 
    1526  2767146009 :         hContextMem->ctx = ( hContextMem->ctx & 0xf ) * 16 + t;
    1527             : 
    1528             :     } /*end of the 2-tuples loop*/
    1529   424840780 :     total_output_bits = (int16_t) ( hContextMem->bit_estimate + 0.5f );
    1530             : 
    1531   424840780 :     bandBits = total_output_bits - hContextMem->nbits_old;
    1532   424840780 :     hContextMem->nbits_old = total_output_bits;
    1533             : 
    1534   424840780 :     return bandBits;
    1535             : }

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