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 TS26.443 Nov 04, 2021. Version 12.14.0 / 13.10.0 / 14.6.0 / 15.4.0 / 16.3.0
      35             :   ====================================================================================*/
      36             : 
      37             : #include <assert.h>
      38             : #include <stdint.h>
      39             : #include "options.h"
      40             : #include <math.h>
      41             : #include "prot.h"
      42             : #include "wmc_auto.h"
      43             : 
      44             : /*-------------------------------------------------------------------*
      45             :  * spec_flatness()
      46             :  *
      47             :  *
      48             :  *-------------------------------------------------------------------*/
      49             : 
      50        3100 : void spec_flatness(
      51             :     float spec_amp[],        /* i  : spectral amplitude             */
      52             :     float smooth_spec_amp[], /* i  : smoothed spectral amplitude    */
      53             :     float sSFM[]             /* o  : spectral flatness rate         */
      54             : )
      55             : {
      56             :     int16_t i;
      57             :     double prods, sums;
      58             :     float SFM;
      59             : 
      60      189100 :     for ( i = MIN_AMP_ID; i <= MAX_AMP_ID; i++ )
      61             :     {
      62      186000 :         smooth_spec_amp[i - MIN_AMP_ID] = smooth_spec_amp[i - MIN_AMP_ID] * 0.7f + spec_amp[i] * 0.3f;
      63             :     }
      64             : 
      65             :     /* sSFM1 */
      66        3100 :     prods = 1;
      67        3100 :     sums = 0;
      68             :     assert( MIN_AMP_ID <= 5 );
      69       49600 :     for ( i = ( 5 - MIN_AMP_ID ); i < ( 20 - MIN_AMP_ID ); i++ )
      70             :     {
      71       46500 :         prods = smooth_spec_amp[i] * prods;
      72       46500 :         sums = sums + smooth_spec_amp[i];
      73             :     }
      74             : 
      75        3100 :     if ( prods > 0 )
      76             :     {
      77        3100 :         prods = pow( prods, 1.0 / 15 );
      78             :     }
      79             :     else
      80             :     {
      81           0 :         prods = 0;
      82             :     }
      83        3100 :     sums = sums / 15;
      84             : 
      85        3100 :     SFM = (float) ( ( prods + 3276.8f ) / ( sums + 3276.8f ) );
      86        3100 :     sSFM[0] = 0.85f * sSFM[0] + 0.15f * SFM;
      87             : 
      88             :     /* sSFM2 */
      89        3100 :     prods = 1;
      90        3100 :     sums = 0;
      91       65100 :     for ( i = ( 20 - MIN_AMP_ID ); i < ( 40 - MIN_AMP_ID ); i++ )
      92             :     {
      93       62000 :         prods = smooth_spec_amp[i] * prods;
      94       62000 :         sums = sums + smooth_spec_amp[i];
      95             :     }
      96             : 
      97        3100 :     if ( prods > 0 )
      98             :     {
      99        3100 :         prods = pow( prods, 1.0 / 20 );
     100             :     }
     101             :     else
     102             :     {
     103           0 :         prods = 0;
     104             :     }
     105        3100 :     sums = sums / 20;
     106        3100 :     SFM = (float) ( ( prods + 3276.8f ) / ( sums + 3276.8f ) );
     107        3100 :     sSFM[1] = 0.85f * sSFM[1] + 0.15f * SFM;
     108             :     /* sSFM3 */
     109        3100 :     prods = 1;
     110        3100 :     sums = 0;
     111       80600 :     for ( i = ( 40 - MIN_AMP_ID ); i <= ( MAX_AMP_ID - MIN_AMP_ID ); i++ )
     112             :     {
     113       77500 :         prods = smooth_spec_amp[i] * prods;
     114       77500 :         sums = sums + smooth_spec_amp[i];
     115             :     }
     116             : 
     117        3100 :     if ( prods > 0 )
     118             :     {
     119        3100 :         prods = pow( prods, 0.04 );
     120             :     }
     121             :     else
     122             :     {
     123           0 :         prods = 0;
     124             :     }
     125        3100 :     sums = sums / 25;
     126        3100 :     SFM = (float) ( ( prods + 3276.8f ) / ( sums + 3276.8f ) );
     127        3100 :     sSFM[2] = 0.85f * sSFM[2] + 0.15f * SFM;
     128             : 
     129             : 
     130        3100 :     return;
     131             : }