LCOV - code coverage report
Current view: top level - lib_enc - gp_clip_fx.c (source / functions) Hit Total Coverage
Test: Coverage on main @ cede165d26d1b794bfc5f5f6f9ec19d4d64a9a3b Lines: 141 178 79.2 %
Date: 2025-11-01 03:16:20 Functions: 6 7 85.7 %

          Line data    Source code
       1             : /******************************************************************************************************
       2             : 
       3             :    (C) 2022-2025 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 TS26.452 Aug 12, 2021. Version 16.3.0
      35             :   ====================================================================================*/
      36             : 
      37             : #include <stdint.h>
      38             : #include "options.h"     /* Compilation switches                   */
      39             : #include "cnst.h"        /* Common constants                       */
      40             : #include "prot_fx.h"     /* Function prototypes                    */
      41             : #include "prot_fx_enc.h" /* Function prototypes                    */
      42             : #include "basop_util.h"
      43             : 
      44             : /*-------------------------------------------------------------------*
      45             :  * Local constants
      46             :  *-------------------------------------------------------------------*/
      47             : 
      48             : #define DIST_ISF_MAX_IO 384   /* 150 Hz (6400Hz=16384) */
      49             : #define DIST_ISF_MAX    307   /* 120 Hz (6400Hz=16384) */
      50             : #define DIST_ISF_THRES  154   /* 60     (6400Hz=16384) */
      51             : #define GAIN_PIT_THRES  14746 /* 0.9 in Q14 */
      52             : #define GAIN_PIT_MIN    9830  /* 0.6 in Q14 */
      53             : 
      54             : #define ALPHA1         32113 /* 0.98f */
      55             : #define ALPHA4         32440 /* 0.99f */
      56             : #define WINDOW_SIZE    50
      57             : #define THRESH_TYPE    13926 /* 0.85f in Q14 */
      58             : #define THRESH_VOICING 14090 /* 0.86f in Q14 */
      59             : 
      60             : #define GPCLIP_E ( 6 + 2 )
      61             : 
      62             : #define ALPHA1_M1 21474836l /*1.0f-0.98 Q30*/
      63             : #define ALPHA4_M1 10737408l /*1.0f-0.99f Q30*/
      64             : 
      65             : /*-------------------------------------------------------------------*
      66             :  * init_gp_clip
      67             :  *
      68             :  * Pitch Gain clipping initializations
      69             :  *-------------------------------------------------------------------*/
      70       32357 : void init_gp_clip_fx(
      71             :     Word16 mem[] /* o  : memory of gain of pitch clipping algorithm             [2.56x,Q14,Q8,Q0,Q14,Q14]*/
      72             : )
      73             : {
      74       32357 :     mem[0] = DIST_ISF_MAX;
      75       32357 :     move16(); /* Q0 */
      76       32357 :     mem[1] = GAIN_PIT_MIN;
      77       32357 :     move16(); /* 1Q14 */
      78       32357 :     mem[2] = 0;
      79       32357 :     move16(); /* 8Q7 */ /* old energy of target (dB) */
      80       32357 :     mem[3] = 0;
      81       32357 :     move16(); /* Q0 */
      82       32357 :     mem[4] = 0;
      83       32357 :     move16();       /* Q14 */
      84       32357 :     mem[5] = 13107; /*0.8*/
      85       32357 :     move16();       /* Q14 */
      86             : 
      87       32357 :     return;
      88             : }
      89             : 
      90             : /*-------------------------------------------------------------------*
      91             :  * Function gp_clip
      92             :  *
      93             :  * The gain needs to be limited (gain pitch < 1.0) when one of the
      94             :  * following cases occurs:
      95             :  * - a resonance on LPC filter (lp_disp < 60 Hz)  AND a good pitch
      96             :  *   prediction (lp_gp > 0.9)
      97             :  * - target energy drops by 6 dB AND a good pitch prediction (lp_gp>1.0)
      98             :  *-------------------------------------------------------------------*/
      99             : 
     100      613261 : Word16 gp_clip_fx(
     101             :     const Word16 element_mode, /* i  : element mode                               Q0*/
     102             :     const Word32 core_brate,   /* i  : core bitrate                               Q0*/
     103             :     const Word16 *voicing,     /* i  : normalized correlations (from OL pitch)    Q15*/
     104             :     const Word16 i_subfr,      /* i  : subframe index                             Q0*/
     105             :     const Word16 coder_type,   /* i  : type of coder                              Q0*/
     106             :     const Word16 xn[],         /* i  : target vector                              Q_new*/
     107             :     Word16 mem[],              /* i/o: memory of gain of pitch clipping algorithm [2.56x,Q14,Q8,Q0,Q14,Q14]*/
     108             :     const Word16 Q_new         /* i  : scaling factor                             */
     109             : )
     110             : {
     111             :     Word16 clip;
     112             :     Word16 i, wener;
     113             :     Word16 e_ener, f_ener;
     114             :     Word32 ener;
     115             :     Word32 L_tmp;
     116             :     Word16 thres;
     117             : 
     118      613261 :     clip = 0;
     119      613261 :     move16();
     120      613261 :     test();
     121      613261 :     test();
     122      613261 :     IF( EQ_32( core_brate, ACELP_6k60 ) || EQ_32( core_brate, ACELP_8k85 ) || element_mode > EVS_MONO )
     123             :     {
     124      606983 :         thres = add( 14746 /* 0.9 in Q14 */, mult( 1638 /* 0.1 in Q14 */, extract_l( L_mult( mem[0], (Word16) ( 16384 / DIST_ISF_MAX_IO ) ) ) ) ); /* clipping is activated when filtered pitch gain > threshold (0.94 to 1 in Q14) */
     125      606983 :         if ( GT_16( mem[1], thres ) )
     126             :         {
     127           0 :             clip = 1;
     128           0 :             move16();
     129             :         }
     130             :     }
     131             :     ELSE
     132             :     {
     133        6278 :         test();
     134        6278 :         if ( LT_16( mem[0], DIST_ISF_THRES ) && GT_16( mem[1], GAIN_PIT_THRES ) )
     135             :         {
     136          16 :             clip = 1;
     137          16 :             move16();
     138             :         }
     139             :     }
     140             : 
     141      613261 :     ener = L_mac_sat( 1L, xn[0], xn[0] );
     142    39248704 :     FOR( i = 1; i < L_SUBFR; i++ )
     143             :     {
     144    38635443 :         ener = L_mac_sat( ener, xn[i], xn[i] );
     145             :     }
     146             : 
     147             :     /* ener = 10.0f*(float)log10(ener) */
     148      613261 :     e_ener = norm_l( ener );
     149      613261 :     f_ener = Log2_norm_lc( L_shl( ener, e_ener ) );
     150      613261 :     e_ener = sub( 30, e_ener );
     151      613261 :     IF( element_mode > EVS_MONO )
     152             :     {
     153      606983 :         e_ener = sub( e_ener, Q_new * 2 + 1 );
     154             :     }
     155             :     ELSE
     156             :     {
     157        6278 :         e_ener = sub( e_ener, Q_new );
     158             :     }
     159      613261 :     ener = Mpy_32_16( e_ener, f_ener, LG10 ); /* Q14 */
     160      613261 :     wener = round_fx( L_shl( ener, 10 ) );    /* Q8 */
     161             : 
     162      613261 :     test();
     163      613261 :     if ( LT_16( wener, sub( mem[2], 1536 /* 6.0f in Q8 */ ) ) && GT_16( mem[1], 16384 /* 1 in Q14 */ ) )
     164             :     {
     165           0 :         clip = 1;
     166           0 :         move16();
     167             :     }
     168             : 
     169      613261 :     mem[2] = wener; /* Q8 */
     170      613261 :     move16();
     171             : 
     172      613261 :     L_tmp = L_mult( ALPHA1, mem[4] ); /* Q30 */
     173             : 
     174      613261 :     test();
     175      613261 :     test();
     176      613261 :     if ( EQ_16( coder_type, GENERIC ) || EQ_16( coder_type, TRANSITION ) || EQ_16( coder_type, INACTIVE ) )
     177             :     {
     178             :         /* mem[4] = (1-ALPHA1) + ALPHA1 * mem[4], if branch taken */
     179             :         /* mem[4] = ALPHA1 * mem[4], otherwise */
     180      548665 :         L_tmp = L_add( L_tmp, 32768L * ( 32768 - ALPHA1 ) ); /* Q30 */
     181             :     }
     182      613261 :     mem[4] = round_fx( L_tmp ); /* Q14 */
     183             : 
     184      613261 :     L_tmp = L_mult( ALPHA4, mem[5] );
     185      613261 :     IF( i_subfr == 0 )
     186             :     {
     187             :         /* mem[5] = (1-ALPHA4) * voicing[0] + ALPHA4 * mem[5] */
     188      141007 :         mem[5] = mac_r( L_tmp, ( 32768 - ALPHA4 ) / 2, voicing[0] );
     189      141007 :         move16(); /* /2 to put voicing from Q15 to Q14 */
     190             :     }
     191             : 
     192      613261 :     IF( EQ_16( i_subfr, 2 * L_SUBFR ) )
     193             :     {
     194             :         /* mem[5] = (1-ALPHA4) * voicing[1] + ALPHA4 * mem[5] */
     195      135876 :         mem[5] = mac_r( L_tmp, ( 32768 - ALPHA4 ) / 2, voicing[1] );
     196      135876 :         move16(); /* /2 to put voicing from Q15 to Q14 */
     197             :     }
     198             : 
     199      613261 :     IF( GT_16( mem[3], WINDOW_SIZE ) )
     200             :     {
     201      427860 :         test();
     202      427860 :         if ( GT_16( mem[4], THRESH_TYPE ) && GT_16( mem[5], THRESH_VOICING ) )
     203             :         {
     204        6109 :             clip = 1;
     205        6109 :             move16();
     206             :         }
     207             :     }
     208             :     ELSE
     209             :     {
     210      185401 :         mem[3] = add( mem[3], 1 ); /* Q0 */
     211      185401 :         move16();
     212             :     }
     213             : 
     214      613261 :     return ( clip );
     215             : }
     216             : 
     217             : /*-------------------------------------------------------------------*
     218             :  * gp_clip_test_lsf()
     219             :  *
     220             :  * check the minimum distance of LSFs for pitch gain clipping flag
     221             :  *-------------------------------------------------------------------*/
     222             : 
     223           0 : void gp_clip_test_isf_fx(
     224             :     const Word16 element_mode, /* i  : element mode                               Q0*/
     225             :     const Word32 core_brate,   /* i  : core bitrate                               Q0*/
     226             :     const Word16 isf[],        /* i  : isf values (in frequency domain)           Q2.56*/
     227             :     Word16 mem[],              /* i/o: memory of gain of pitch clipping algorithm Q15*/
     228             :     const Word16 Opt_AMR_WB    /* i  : flag indicating AMR-WB IO mode             Q0*/
     229             : )
     230             : {
     231             :     Word16 i, dist, dist_min, m;
     232             : 
     233           0 :     dist_min = sub( isf[1], isf[0] ); /* Q2.56 */
     234             : 
     235           0 :     m = M;
     236           0 :     move16();
     237           0 :     if ( EQ_16( Opt_AMR_WB, 1 ) )
     238             :     {
     239           0 :         m = M - 1;
     240           0 :         move16();
     241             :     }
     242             : 
     243           0 :     move16(); /* ptr init*/
     244           0 :     FOR( i = 2; i < m; i++ )
     245             :     {
     246           0 :         dist = sub( isf[i], isf[i - 1] );   /* Q2.56 */
     247           0 :         dist_min = s_min( dist, dist_min ); /* Q2.56 */
     248             :     }
     249             : 
     250           0 :     dist = extract_h( L_mac( L_mult( 26214 /* 0.8f in Q15 */, mem[0] ), 6554 /* 0.2f in Q15 */, dist_min ) ); /* Q15 */
     251             : 
     252           0 :     test();
     253           0 :     test();
     254           0 :     IF( EQ_32( core_brate, ACELP_6k60 ) || EQ_32( core_brate, ACELP_8k85 ) || element_mode > EVS_MONO )
     255             :     {
     256           0 :         dist = s_min( dist, DIST_ISF_MAX_IO );
     257             :     }
     258             :     ELSE
     259             :     {
     260           0 :         dist = s_min( dist, DIST_ISF_MAX );
     261             :     }
     262           0 :     mem[0] = dist; /* Q15 */
     263           0 :     move16();
     264             : 
     265           0 :     return;
     266             : }
     267             : 
     268             : /*-------------------------------------------------------------------*
     269             :  * gp_clip_test_gain_pit()
     270             :  *
     271             :  * low-pass filtering of the pitch gain for pitch gain clipping flag
     272             :  *-------------------------------------------------------------------*/
     273             : 
     274      645221 : void gp_clip_test_gain_pit_fx(
     275             :     const Word16 element_mode, /* i  : element mode                                                                     Q0*/
     276             :     const Word32 core_brate,   /* i  : core bitrate                                                                     Q0*/
     277             :     const Word16 gain_pit,     /* i  : gain of quantized pitch                                          Q14*/
     278             :     Word16 mem[]               /* i/o: memory of gain of pitch clipping algorithm       1Q14*/
     279             : )
     280             : {
     281             :     Word16 gain;
     282             :     Word32 L_tmp;
     283             : 
     284      645221 :     test();
     285      645221 :     test();
     286      645221 :     IF( EQ_32( core_brate, ACELP_6k60 ) || EQ_32( core_brate, ACELP_8k85 ) || element_mode > EVS_MONO )
     287             :     {
     288      635786 :         L_tmp = L_mult( 32113 /* 0.98 in Q15 */, mem[1] ); /* long term LTP gain average (>250ms) */
     289      635786 :         L_tmp = L_mac( L_tmp, 655 /* 0.02 in Q15 */, gain_pit );
     290             :     }
     291             :     ELSE
     292             :     {
     293        9435 :         L_tmp = L_mult( 29491 /* 0.9 in Q15 */, mem[1] );
     294        9435 :         L_tmp = L_mac( L_tmp, 3277 /* 0.1 in Q15 */, gain_pit );
     295             :     }
     296      645221 :     gain = extract_h( L_tmp );
     297      645221 :     gain = s_max( gain, GAIN_PIT_MIN );
     298      645221 :     mem[1] = gain; /* Q14 */
     299      645221 :     move16();
     300             : 
     301      645221 :     return;
     302             : }
     303             : 
     304             : 
     305             : /*-------------------------------------------------------------------*
     306             :  * Function gp_clip
     307             :  *
     308             :  * The gain needs to be limited (gain pitch < 1.0) when one of the
     309             :  * following cases occurs:
     310             :  * - a resonance on LPC filter (lp_disp < 60 Hz)  AND a good pitch
     311             :  *   prediction (lp_gp > 0.9)
     312             :  * - target energy drops by 6 dB AND a good pitch prediction (lp_gp>1.0)
     313             :  *-------------------------------------------------------------------*/
     314       11120 : Word16 Mode2_gp_clip_fx(
     315             :     const Word16 *voicing,   /* i  : normalized correlations from OL pitch  Q15 */
     316             :     const Word16 i_subfr,    /* i  : subframe index                         Q0  */
     317             :     const Word16 coder_type, /* i  : type of coder                          Q0  */
     318             :     const Word16 xn[],       /* i  : target vector                         Q_xn */
     319             :     Word16 mem[],            /* i/o: memory of gain of pitch clipping algorithm */
     320             :     /*      mem[0]:      Q0                            */
     321             :     /*      mem[1]:     1Q14                           */
     322             :     /*      mem[2]:     8Q7                            */
     323             :     /*      mem[3]:      Q0   (integer)                */
     324             :     /*      mem[4]:      Q14                           */
     325             :     /*      mem[5]:      Q14                           */
     326             :     const Word16 L_subfr, /* Q0 */
     327             :     const Word16 Q_xn     /* i  : scaling factor of vector xn[]              */
     328             : )
     329             : {
     330             :     Word16 clip, tmp, exp_xn;
     331             :     Word16 i;
     332             :     Word32 wener, Ltmp;
     333             : 
     334       11120 :     move16();
     335       11120 :     clip = 0;
     336             : 
     337       11120 :     test();
     338       11120 :     if ( ( LT_16( mem[0], DIST_ISF_THRES ) ) && ( GT_16( mem[1], GAIN_PIT_THRES ) ) )
     339             :     {
     340           0 :         move16();
     341           0 :         clip = 1;
     342             :     }
     343             : 
     344             :     /*ener_exp = exp_xn * 2 + 1*/
     345       11120 :     exp_xn = add( shl( sub( 15, Q_xn ), 1 ), 1 );
     346       11120 :     wener = L_shr( 21474836l /*0.01f Q31*/, s_min( 31, exp_xn ) );
     347       11120 :     wener = L_max( 1, wener );
     348             : 
     349      722800 :     FOR( i = 0; i < L_subfr; i++ )
     350             :     {
     351      711680 :         wener = L_mac0_sat( wener, xn[i], xn[i] );
     352             :     }
     353             : 
     354             :     /*wener = 10.0f*(float)log10(wener);*/
     355       11120 :     wener = BASOP_Util_Log2( wener );
     356       11120 :     wener = L_add( wener, L_shl( exp_xn, 31 - LD_DATA_SCALE ) );
     357       11120 :     wener = Mpy_32_16_1( wener, LG10 ); /* wener in 8Q7 */
     358             : #if ( GPCLIP_E != 6 + 2 )
     359             :     wener = shl( wener, GPCLIP_E - ( 6 + 2 ) );
     360             : #endif
     361       11120 :     tmp = round_fx( wener );
     362             :     /* exponent of wener = 6+2 */
     363             : 
     364       11120 :     test();
     365       12067 :     if ( LT_16( tmp, sub( mem[2], 768 /*6.0f Q7*/ ) ) &&
     366         947 :          GT_16( mem[1], 16384 /*1.0f Q14*/ ) )
     367             :     {
     368           0 :         move16();
     369           0 :         clip = 1;
     370             :     }
     371             : 
     372       11120 :     move16();
     373       11120 :     mem[2] = tmp;                         /* wener  in 8Q7 format */
     374       11120 :     Ltmp = Mpy_32_16_1( ALPHA1, mem[4] ); /* mem[4] in Q14 format, Ltmp in Q14 */
     375             : 
     376       11120 :     if ( s_or( (Word16) EQ_16( coder_type, GENERIC ), (Word16) EQ_16( coder_type, TRANSITION ) ) )
     377             :     {
     378        1575 :         Ltmp = L_add( Ltmp, ALPHA1_M1 ); /* Q30 */
     379             :     }
     380       11120 :     mem[4] = round_fx( Ltmp ); /* Q14 */
     381             : 
     382       11120 :     Ltmp = Mpy_32_16_1( ALPHA4, mem[5] ); /* mem[5] in Q14 format, Ltmp in Q14 */
     383       11120 :     IF( i_subfr == 0 )
     384             :     {
     385        2627 :         move16();                                                                 /* voicing: Q15 */
     386        2627 :         mem[5] = round_fx( L_add( Mpy_32_16_1( ALPHA4_M1, voicing[0] ), Ltmp ) ); /* Q14 */
     387             :     }
     388        8493 :     ELSE IF( EQ_16( i_subfr, shl( L_subfr, 1 ) ) )
     389             :     {
     390        2627 :         move16();
     391        2627 :         mem[5] = round_fx( L_add( Mpy_32_16_1( ALPHA4_M1, voicing[1] ), Ltmp ) ); /* Q14 */
     392             :     }
     393             : 
     394       11120 :     IF( GT_16( mem[3], WINDOW_SIZE ) )
     395             :     {
     396        7691 :         test();
     397        7691 :         if ( ( GT_16( mem[4], THRESH_TYPE ) ) && ( GT_16( mem[5], THRESH_VOICING ) ) )
     398             :         {
     399           0 :             move16();
     400           0 :             clip = 1;
     401             :         }
     402             :     }
     403             :     ELSE
     404             :     {
     405        3429 :         move16();
     406        3429 :         mem[3] = add( mem[3], 1 ); /* Q0 */
     407             :     }
     408             : 
     409             : 
     410       11120 :     return ( clip );
     411             : }
     412             : 
     413             : /*-------------------------------------------------------------------*
     414             :  * gp_clip_test_lsf:
     415             :  *
     416             :  * check the minimum distance of LSFs for pitch gain clipping flag
     417             :  *-------------------------------------------------------------------*/
     418        2669 : void gp_clip_test_lsf_fx(
     419             :     const Word16 element_mode, /* i  : element mode                                                                     Q0*/
     420             :     const Word16 lsf[],        /* i  : lsf values (in frequency domain)                         14Q1*1.28*/
     421             :     Word16 mem[],              /* i/o: memory of gain of pitch clipping algorithm       [2.56x,Q14,Q8,Q0,Q14,Q14]*/
     422             :     const Word16 m             /* i  : dimension of lsf                                                         Q0*/
     423             : )
     424             : {
     425             :     Word16 i;
     426             :     Word16 dist, dist_min, dist_max;
     427             : 
     428        2669 :     dist_max = DIST_ISF_MAX;
     429        2669 :     move16();
     430        2669 :     if ( element_mode > EVS_MONO )
     431             :     {
     432           0 :         dist_max = DIST_ISF_MAX_IO;
     433           0 :         move16();
     434             :     }
     435        2669 :     dist_min = sub( lsf[1], lsf[0] ); /* 14Q1*1.28 */
     436             : 
     437       18867 :     FOR( i = 2; i < m - 1; i++ )
     438             :     {
     439       16198 :         dist = sub( lsf[i], lsf[i - 1] ); /* 14Q1*1.28 */
     440       16198 :         dist_min = s_min( dist, dist_min );
     441             :     }
     442             :     /*dist = 0.8f*mem[0] + 0.2f*dist_min;*/
     443        2669 :     dist = s_min( dist_max, mac_r( L_mult( 26214 /*0.8f Q15*/, mem[0] ), 6554 /*0.2f Q15*/, dist_min ) ); /* x2.56 */
     444             : 
     445        2669 :     mem[0] = dist; /* x2.56 */
     446        2669 :     move16();
     447             : 
     448             : 
     449        2669 :     return;
     450             : }
     451             : 
     452      174460 : void gp_clip_test_lsf_ivas_fx(
     453             :     const Word16 element_mode, /* i  : element mode                               Q0*/
     454             :     const Word32 core_brate,   /* i  : core bitrate                               Q0*/
     455             :     const Word16 lsf[],        /* i  : LSF vector                                 14Q1*1.28*/
     456             :     Word16 mem[],              /* i/o: memory of gain of pitch clipping algorithm [2.56x,Q14,Q8,Q0,Q14,Q14]*/
     457             :     const Word16 Opt_AMR_WB    /* i  : flag indicating AMR-WB IO mode             Q0*/
     458             : )
     459             : {
     460             :     Word16 i;
     461             :     Word16 m;
     462             :     Word16 dist, dist_min;
     463             : 
     464      174460 :     dist_min = sub( lsf[1], lsf[0] ); /* 14Q1*1.28 */
     465             : 
     466      174460 :     IF( Opt_AMR_WB )
     467             :     {
     468           0 :         m = M - 1;
     469           0 :         move16();
     470             :     }
     471             :     ELSE
     472             :     {
     473      174460 :         m = M;
     474      174460 :         move16();
     475             :     }
     476             : 
     477     2616900 :     FOR( i = 2; i < m; i++ )
     478             :     {
     479     2442440 :         dist = sub( lsf[i], lsf[i - 1] ); /* 14Q1*1.28 */
     480     2442440 :         dist_min = s_min( dist, dist_min );
     481             :     }
     482             : 
     483             :     // dist = 0.8f * mem[0] + 0.2f * dist_min;
     484      174460 :     dist = mac_r( L_mult( 26214 /*0.8f Q15*/, mem[0] ), 6554 /*0.2f Q15*/, dist_min ); /* 2.56x */
     485             : 
     486      174460 :     test();
     487      174460 :     test();
     488      174460 :     IF( EQ_32( core_brate, ACELP_6k60 ) || EQ_32( core_brate, ACELP_8k85 ) || ( element_mode > EVS_MONO ) )
     489             :     {
     490      174460 :         if ( GT_16( dist, DIST_ISF_MAX_IO ) )
     491             :         {
     492       74088 :             dist = DIST_ISF_MAX_IO;
     493       74088 :             move16();
     494             :         }
     495             :     }
     496           0 :     ELSE IF( GT_16( dist, DIST_ISF_MAX ) )
     497             :     {
     498           0 :         dist = DIST_ISF_MAX;
     499           0 :         move16();
     500             :     }
     501             : 
     502      174460 :     mem[0] = dist; /* 2.56x */
     503      174460 :     move16();
     504             : 
     505      174460 :     return;
     506             : }

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