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             : #include "prot_fx.h"
      40             : #include "wmc_auto.h"
      41             : 
      42             : /*-------------------------------------------------------------*
      43             :  * preemph_ivas_fx()
      44             :  *
      45             :  * Preemphasis: filtering through 1 - mu z^-1
      46             :  *-------------------------------------------------------------*/
      47             : 
      48       63461 : void preemph_ivas_fx(
      49             :     Word32 *signal,  /* i/o: signal             Qx*/
      50             :     const Word16 mu, /* i  : preemphasis factor Q15*/
      51             :     const Word16 L,  /* i  : vector size        Q0*/
      52             :     Word32 *mem      /* i/o: memory (x[-1])     Qx*/
      53             : )
      54             : {
      55             :     Word16 i;
      56             :     Word32 temp;
      57             : 
      58       63461 :     temp = signal[L - 1]; /* Qx */
      59       63461 :     move32();
      60    19183312 :     FOR( i = L - 1; i > 0; i-- )
      61             :     {
      62    19119851 :         signal[i] = L_sub( signal[i], Mpy_32_16_1( signal[i - 1], mu ) ); /* Qx */
      63    19119851 :         move32();
      64             :     }
      65             : 
      66       63461 :     signal[0] = L_sub( signal[0], Mpy_32_16_1( *mem, mu ) ); /* Qx */
      67       63461 :     move32();
      68       63461 :     *mem = temp; /* Qx */
      69       63461 :     move32();
      70             : 
      71       63461 :     return;
      72             : }