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 <math.h>
      43             : #include "prot.h"
      44             : #include "cnst.h"
      45             : #include "wmc_auto.h"
      46             : 
      47             : /*----------------------------------------------------------------------------------*
      48             :  *  findpulse()
      49             :  *
      50             :  *  Find first pitch pulse in a frame
      51             :  *----------------------------------------------------------------------------------*/
      52             : 
      53             : /*! r: pulse position */
      54       14458 : int16_t findpulse(
      55             :     const int16_t L_frame, /* i  : length of the frame   */
      56             :     const float res[],     /* i  : residual signal       */
      57             :     const int16_t T0,      /* i  : integer pitch         */
      58             :     const int16_t enc_dec, /* i  : flag enc/dec, 0 - enc, 1 - dec */
      59             :     int16_t *sign          /* i/o: sign of the maximum   */
      60             : )
      61             : {
      62             :     const float *ptr;
      63             :     float val, maxval;
      64             :     int16_t i, maxi;
      65             :     float resf[L_FRAME16k]; /* Low pass filtered residual */
      66             : 
      67       14458 :     if ( enc_dec == ENC )
      68             :     {
      69             :         /*-----------------------------------------------------------------*
      70             :          * Very simple LP filter
      71             :          *-----------------------------------------------------------------*/
      72             : 
      73       14458 :         resf[0] = 0.50f * res[0] + 0.25f * res[1];
      74     4612102 :         for ( i = 1; i < L_frame - 1; i++ )
      75             :         {
      76     4597644 :             resf[i] = 0.25f * res[i - 1] + 0.5f * res[i] + 0.25f * res[i + 1];
      77             :         }
      78       14458 :         resf[L_frame - 1] = 0.25f * res[L_frame - 2] + 0.50f * res[L_frame - 1];
      79             : 
      80             :         /*-----------------------------------------------------------------*
      81             :          * Find "biggest" pulse in the last pitch section
      82             :          *-----------------------------------------------------------------*/
      83             : 
      84       14458 :         ptr = resf + L_frame - 1;
      85       14458 :         maxval = 0;
      86       14458 :         maxi = 0;
      87     1428151 :         for ( i = 0; i < T0; i++ )
      88             :         {
      89     1413693 :             val = (float) fabs( *ptr );
      90     1413693 :             if ( val > maxval )
      91             :             {
      92       90628 :                 maxval = val;
      93       90628 :                 maxi = i;
      94       90628 :                 if ( *ptr >= 0 )
      95             :                 {
      96       48408 :                     *sign = 0;
      97             :                 }
      98             :                 else
      99             :                 {
     100       42220 :                     *sign = 1;
     101             :                 }
     102             :             }
     103     1413693 :             ptr--;
     104             :         }
     105             :     }
     106             :     else
     107             :     {
     108             :         /*-----------------------------------------------------------------*
     109             :          * Find "biggest" pulse in the last pitch section according to the sign
     110             :          *-----------------------------------------------------------------*/
     111             : 
     112           0 :         ptr = res;
     113           0 :         maxval = 0;
     114           0 :         maxi = 0;
     115             : 
     116           0 :         if ( *sign == 0 )
     117             :         {
     118           0 :             for ( i = 1; i <= T0; i++ )
     119             :             {
     120           0 :                 val = *ptr++;
     121           0 :                 if ( val >= maxval )
     122             :                 {
     123           0 :                     maxval = val;
     124           0 :                     maxi = i;
     125             :                 }
     126             :             }
     127             :         }
     128             :         else
     129             :         {
     130           0 :             for ( i = 1; i <= T0; i++ )
     131             :             {
     132           0 :                 val = *ptr++;
     133           0 :                 if ( val <= maxval )
     134             :                 {
     135           0 :                     maxval = val;
     136           0 :                     maxi = i;
     137             :                 }
     138             :             }
     139             :         }
     140             :     }
     141             : 
     142       14458 :     return ( maxi );
     143             : }