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             : #include <stdint.h>
      34             : #include "options.h"
      35             : #include "ivas_cnst.h"
      36             : #include "ivas_prot.h"
      37             : #include "ivas_rom_com.h"
      38             : #include "ivas_stat_dec.h"
      39             : #include "wmc_auto.h"
      40             : #include "prot.h"
      41             : 
      42             : 
      43             : /*-------------------------------------------------------------------*
      44             :  * deindex_elevation()
      45             :  *
      46             :  * Decode elevation index
      47             :  *----------------------------------------------------------------------*/
      48             : 
      49             : /*! r: decoded elevation value */
      50     5433966 : float deindex_elevation(
      51             :     uint16_t *id_th,            /* i  : input index                             */
      52             :     const int16_t no_bits,      /* i  : number of bits for the spherical grid   */
      53             :     const MC_LS_SETUP mc_format /* i  : channel format if in MC-mode            */
      54             : )
      55             : {
      56             :     float theta_hat;
      57             : 
      58     5433966 :     if ( *id_th == MASA_NO_INDEX )
      59             :     {
      60           0 :         theta_hat = 0;
      61             :     }
      62             :     else
      63             :     {
      64     5433966 :         if ( mc_format != MC_LS_SETUP_INVALID )
      65             :         {
      66      185349 :             theta_hat = ( *id_th * delta_theta_masa[no_bits - 3] );
      67      185349 :             if ( theta_hat > 90 )
      68             :             {
      69         231 :                 theta_hat = 90;
      70             :             }
      71             :         }
      72             :         else
      73             :         {
      74     5248617 :             if ( *id_th % 2 == 0 )
      75             :             {
      76             :                 /* theta is negative */
      77     4392456 :                 *id_th = *id_th / 2;
      78     4392456 :                 theta_hat = -( *id_th * delta_theta_masa[no_bits - 3] );
      79     4392456 :                 if ( theta_hat < -90 )
      80             :                 {
      81         777 :                     theta_hat = -90;
      82             :                 }
      83             :             }
      84             :             else
      85             :             {
      86      856161 :                 *id_th = ( *id_th + 1 ) / 2;
      87      856161 :                 theta_hat = ( *id_th * delta_theta_masa[no_bits - 3] );
      88      856161 :                 if ( theta_hat > 90 )
      89             :                 {
      90         270 :                     theta_hat = 90;
      91             :                 }
      92             :             }
      93             :         }
      94             :     }
      95             : 
      96     5433966 :     return theta_hat;
      97             : }