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 26.073 22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec 23 Available from http://www.3gpp.org 24 25 (C) 2004, 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: /audio/gsm_amr/c/include/add.h 35 36 37 38 39 Date: 08/11/2000 40 41 42 43 ------------------------------------------------------------------------------ 44 REVISION HISTORY 45 46 47 Description: Created separate header file for add function. 48 49 Description: Changed function prototype; pointer to overflow flag is passed 50 in as a parameter. 51 52 Description: Updated copyright section. 53 Changed "overflow" to "pOverflow" in the function prototype. 54 55 Description: Moved _cplusplus #ifdef after Include section. 56 57 Description: 58 59 60 ------------------------------------------------------------------------------ 61 INCLUDE DESCRIPTION 62 63 This file contains all the constant definitions and prototype definitions 64 needed by the comfort noise(CN) generator functions 65 66 ------------------------------------------------------------------------------ 67 */ 68 69 #ifndef B_CN_COD_H 70 #define B_CN_COD_H 71 72 /*---------------------------------------------------------------------------- 73 ; INCLUDES 74 ----------------------------------------------------------------------------*/ 75 #include "basicop_malloc.h" 76 77 /*--------------------------------------------------------------------------*/ 78 #ifdef __cplusplus 79 extern "C" 80 { 81 #endif 82 83 /*---------------------------------------------------------------------------- 84 ; MACROS 85 ; Define module specific macros here 86 ----------------------------------------------------------------------------*/ 87 88 /*---------------------------------------------------------------------------- 89 ; DEFINES 90 ; Include all pre-processor statements here. 91 ----------------------------------------------------------------------------*/ 92 93 /*---------------------------------------------------------------------------- 94 ; EXTERNAL VARIABLES REFERENCES 95 ; Declare variables used in this module but defined elsewhere 96 ----------------------------------------------------------------------------*/ 97 extern Word16 window_200_40[]; 98 99 /*---------------------------------------------------------------------------- 100 ; SIMPLE TYPEDEF'S 101 ----------------------------------------------------------------------------*/ 102 103 /*---------------------------------------------------------------------------- 104 ; ENUMERATED TYPEDEF'S 105 ----------------------------------------------------------------------------*/ 106 107 /*---------------------------------------------------------------------------- 108 ; STRUCTURES TYPEDEF'S 109 ----------------------------------------------------------------------------*/ 110 111 /*---------------------------------------------------------------------------- 112 ; GLOBAL FUNCTION DEFINITIONS 113 ; Function Prototype declaration 114 ----------------------------------------------------------------------------*/ 115 116 /*---------------------------------------------------------------------------- 117 118 ; FUNCTION NAME: pseudonoise 119 ; 120 ; PURPOSE: Generate a random integer value to use in comfort noise 121 ; generation. The algorithm uses polynomial x^31 + x^3 + 1 122 ; (length of PN sequence is 2^31 - 1). 123 ; 124 ----------------------------------------------------------------------------*/ 125 126 Word16 pseudonoise( 127 Word32 *pShift_reg, /* i/o : Old CN generator shift register state */ 128 Word16 no_bits /* i : Number of bits */ 129 ); 130 131 /*---------------------------------------------------------------------------- 132 133 ; FUNCTION NAME: build_CN_code 134 ; 135 ; PURPOSE: Compute the comfort noise fixed codebook excitation. The 136 ; gains of the pulses are always +/-1. 137 ; 138 ----------------------------------------------------------------------------*/ 139 140 void build_CN_code( 141 Word32 *pSeed, /* i/o : Old CN generator shift register state */ 142 Word16 cod[], /* o : Generated CN fixed codebook vector */ 143 Flag *pOverflow /* i/o : Overflow flag */ 144 ); 145 146 /*---------------------------------------------------------------------------- 147 148 ; FUNCTION NAME: build_CN_param 149 ; 150 ; PURPOSE: Randomize the speech parameters. So that they 151 ; do not produce tonal artifacts if used by ECU. 152 ; 153 ----------------------------------------------------------------------------*/ 154 155 void build_CN_param( 156 Word16 *pSeed, /* i/o : Old CN generator shift register state */ 157 const Word16 n_param, /* i : number of params */ 158 const Word16 param_size_table[], /* i : size of params */ 159 Word16 parm[], /* o : CN Generated params */ 160 Flag *pOverflow /* i/o : Overflow Flag */ 161 ); 162 163 /*---------------------------------------------------------------------------- 164 ; END 165 ----------------------------------------------------------------------------*/ 166 #ifdef __cplusplus 167 } 168 #endif 169 170 #endif /* _B_CN_COD_H_ */ 171 172
