Home | History | Annotate | Download | only in src 
      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      Date: 05/08/2007
     37 
     38 ------------------------------------------------------------------------------
     39  REVISION HISTORY
     40 
     41 
     42  Description:
     43 
     44 ------------------------------------------------------------------------------
     45  INPUT AND OUTPUT DEFINITIONS
     46 
     47     int16 * seed          seed for the random ng
     48 
     49 ------------------------------------------------------------------------------
     50  FUNCTION DESCRIPTION
     51 
     52     Signed 16 bits random generator
     53 
     54 ------------------------------------------------------------------------------
     55  REQUIREMENTS
     56 
     57 
     58 ------------------------------------------------------------------------------
     59  REFERENCES
     60 
     61 ------------------------------------------------------------------------------
     62  PSEUDO-CODE
     63 
     64 ------------------------------------------------------------------------------
     65 */
     66 
     67 
     68 /*----------------------------------------------------------------------------
     69 ; INCLUDES
     70 ----------------------------------------------------------------------------*/
     71 
     72 #include "pv_amr_wb_type_defs.h"
     73 #include "pvamrwbdecoder_basic_op.h"
     74 #include "pvamrwbdecoder_acelp.h"
     75 
     76 /*----------------------------------------------------------------------------
     77 ; MACROS
     78 ; Define module specific macros here
     79 ----------------------------------------------------------------------------*/
     80 
     81 
     82 /*----------------------------------------------------------------------------
     83 ; DEFINES
     84 ; Include all pre-processor statements here. Include conditional
     85 ; compile variables also.
     86 ----------------------------------------------------------------------------*/
     87 
     88 /*----------------------------------------------------------------------------
     89 ; LOCAL FUNCTION DEFINITIONS
     90 ; Function Prototype declaration
     91 ----------------------------------------------------------------------------*/
     92 
     93 /*----------------------------------------------------------------------------
     94 ; LOCAL STORE/BUFFER/POINTER DEFINITIONS
     95 ; Variable declaration - defined here and used outside this module
     96 ----------------------------------------------------------------------------*/
     97 
     98 /*----------------------------------------------------------------------------
     99 ; EXTERNAL FUNCTION REFERENCES
    100 ; Declare functions defined elsewhere and referenced in this module
    101 ----------------------------------------------------------------------------*/
    102 
    103 /*----------------------------------------------------------------------------
    104 ; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
    105 ; Declare variables used in this module but defined elsewhere
    106 ----------------------------------------------------------------------------*/
    107 
    108 /*----------------------------------------------------------------------------
    109 ; FUNCTION CODE
    110 ----------------------------------------------------------------------------*/
    111 
    112 int16 noise_gen_amrwb(int16 * seed)
    113 {
    114     /*  int16 seed = 21845; */
    115     *seed = (int16)fxp_mac_16by16(*seed, 31821, 13849L);
    116 
    117     return (*seed);
    118 }
    119