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 <stdint.h>
      38             : #include "options.h"
      39             : #ifdef DEBUGGING
      40             : #include "debug.h"
      41             : #endif
      42             : #include "cnst.h"
      43             : #include "prot.h"
      44             : #include "wmc_auto.h"
      45             : 
      46             : /*-------------------------------------------------------------------*
      47             :  * est_tilt()
      48             :  *
      49             :  * Estimate spectral tilt based on the relative E of adaptive
      50             :  * and innovative excitations
      51             :  *-------------------------------------------------------------------*/
      52             : 
      53             : /*! r: tilt of the code */
      54     2426659 : float est_tilt(
      55             :     const float *adpt_exc,  /* i  : adaptive excitation vector   */
      56             :     const float gain_pit,   /* i  : adaptive gain                */
      57             :     const float *fixe_exc,  /* i  : algebraic exctitation vector */
      58             :     const float gain_code,  /* i  : algebraic code gain          */
      59             :     float *voice_fac,       /* o  : voicing factor               */
      60             :     const int16_t L_subfr,  /* i  : subframe size                */
      61             :     const int16_t flag_tilt /* i  : flag for special tilt        */
      62             : )
      63             : {
      64             :     float ener, tmp, tilt_code;
      65             : 
      66     2426659 :     ener = dotp( adpt_exc, adpt_exc, L_subfr );
      67     2426659 :     ener *= gain_pit * gain_pit; /* energy of pitch excitation */
      68             : 
      69     2426659 :     tmp = dotp( fixe_exc, fixe_exc, L_subfr );
      70     2426659 :     tmp *= gain_code * gain_code; /* energy of innovative code excitation */
      71             : 
      72             :     /* find voice factor (1=voiced, -1=unvoiced) */
      73     2426659 :     *voice_fac = (float) ( ( ener - tmp ) / ( ener + tmp + 0.01f ) );
      74             : 
      75             :     /* find tilt of code for next subframe */
      76     2426659 :     if ( flag_tilt == 0 )
      77             :     {
      78             :         /*Between 0 (=unvoiced) and 0.5 (=voiced)*/
      79     2414579 :         tilt_code = (float) ( 0.25f * ( 1.0f + *voice_fac ) );
      80             :     }
      81       12080 :     else if ( flag_tilt == 1 )
      82             :     {
      83             :         /*Between 0.25 (=unvoiced) and 0.5 (=voiced)*/
      84           0 :         tilt_code = (float) ( 0.25f + ( *voice_fac + 1.0f ) * 0.125f );
      85             :     }
      86             :     else
      87             :     {
      88             :         /*Between 0.28 (=unvoiced) and 0.56 (=voiced)*/
      89       12080 :         tilt_code = (float) ( 0.28f + ( *voice_fac + 1.0f ) * 0.14f );
      90             :     }
      91             : 
      92     2426659 :     return tilt_code;
      93             : }