opencore/codecs_v2/audio/gsm_amr/amr_wb/dec/src/noise_gen_amrwb.cpp

   1 /* ------------------------------------------------------------------
   2  * Copyright (C) 1998-2009 PacketVideo
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
  13  * express or implied.
  14  * See the License for the specific language governing permissions
  15  * and limitations under the License.
  16  * -------------------------------------------------------------------
  17  */
  18 /****************************************************************************************
  19 Portions of this file are derived from the following 3GPP standard:
  20
  21     3GPP TS 26.173
  22     ANSI-C code for the Adaptive Multi-Rate - Wideband (AMR-WB) speech codec
  23     Available from http://www.3gpp.org
  24
  25 (C) 2007, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
  26 Permission to distribute, modify and use this file under the standard license
  27 terms listed above has been obtained from the copyright holder.
  28 ****************************************************************************************/
  29 /*
  30 ------------------------------------------------------------------------------
  31
  32
  33
  34  Filename: noise_gen_amrwb.cpp
  35
  36 ------------------------------------------------------------------------------
  37  INPUT AND OUTPUT DEFINITIONS
  38
  39     int16 * seed          seed for the random ng
  40
  41 ------------------------------------------------------------------------------
  42  FUNCTION DESCRIPTION
  43
  44     Signed 16 bits random generator
  45
  46 ------------------------------------------------------------------------------
  47  REQUIREMENTS
  48
  49
  50 ------------------------------------------------------------------------------
  51  REFERENCES
  52
  53 ------------------------------------------------------------------------------
  54  PSEUDO-CODE
  55
  56 ------------------------------------------------------------------------------
  57 */
  58
  59
  60 /*----------------------------------------------------------------------------
  61 ; INCLUDES
  62 ----------------------------------------------------------------------------*/
  63
  64 #include "pv_amr_wb_type_defs.h"
  65 #include "pvamrwbdecoder_basic_op.h"
  66 #include "pvamrwbdecoder_acelp.h"
  67
  68 /*----------------------------------------------------------------------------
  69 ; MACROS
  70 ; Define module specific macros here
  71 ----------------------------------------------------------------------------*/
  72
  73
  74 /*----------------------------------------------------------------------------
  75 ; DEFINES
  76 ; Include all pre-processor statements here. Include conditional
  77 ; compile variables also.
  78 ----------------------------------------------------------------------------*/
  79
  80 /*----------------------------------------------------------------------------
  81 ; LOCAL FUNCTION DEFINITIONS
  82 ; Function Prototype declaration
  83 ----------------------------------------------------------------------------*/
  84
  85 /*----------------------------------------------------------------------------
  86 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
  87 ; Variable declaration - defined here and used outside this module
  88 ----------------------------------------------------------------------------*/
  89
  90 /*----------------------------------------------------------------------------
  91 ; EXTERNAL FUNCTION REFERENCES
  92 ; Declare functions defined elsewhere and referenced in this module
  93 ----------------------------------------------------------------------------*/
  94
  95 /*----------------------------------------------------------------------------
  96 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
  97 ; Declare variables used in this module but defined elsewhere
  98 ----------------------------------------------------------------------------*/
  99
 100 /*----------------------------------------------------------------------------
 101 ; FUNCTION CODE
 102 ----------------------------------------------------------------------------*/
 103
 104 int16 noise_gen_amrwb(int16 * seed)
 105 {
 106     /*  int16 seed = 21845; */
 107     *seed = (int16)fxp_mac_16by16(*seed, 31821, 13849L);
 108
 109     return (*seed);
 110 }