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/src/include/bgnscd.h 35 36 Date: 12/29/2002 37 38 ------------------------------------------------------------------------------ 39 REVISION HISTORY 40 41 Description: Moved _cplusplus #ifdef after Include section. 42 43 Description: 44 45 ------------------------------------------------------------------------------ 46 INCLUDE DESCRIPTION 47 48 File : bgnscd.h 49 Purpose : Background noise source charateristic detector (SCD) 50 51 ------------------------------------------------------------------------------ 52 */ 53 54 #ifndef _BGNSCD_H_ 55 #define _BGNSCD_H_ 56 57 /*---------------------------------------------------------------------------- 58 ; INCLUDES 59 ----------------------------------------------------------------------------*/ 60 #include "typedef.h" 61 #include "cnst.h" 62 63 /*--------------------------------------------------------------------------*/ 64 #ifdef __cplusplus 65 extern "C" 66 { 67 #endif 68 69 /*---------------------------------------------------------------------------- 70 ; MACROS 71 ; [Define module specific macros here] 72 ----------------------------------------------------------------------------*/ 73 74 /*---------------------------------------------------------------------------- 75 ; DEFINES 76 ; [Include all pre-processor statements here.] 77 ----------------------------------------------------------------------------*/ 78 #define L_ENERGYHIST 60 79 #define INV_L_FRAME 102 80 81 82 /* 2*(160*x)^2 / 65536 where x is FLP values 150,5 and 50 */ 83 #define FRAMEENERGYLIMIT 17578 /* 150 */ 84 #define LOWERNOISELIMIT 20 /* 5 */ 85 #define UPPERNOISELIMIT 1953 /* 50 */ 86 87 88 /*---------------------------------------------------------------------------- 89 ; EXTERNAL VARIABLES REFERENCES 90 ; [Declare variables used in this module but defined elsewhere] 91 ----------------------------------------------------------------------------*/ 92 93 /*---------------------------------------------------------------------------- 94 ; SIMPLE TYPEDEF'S 95 ----------------------------------------------------------------------------*/ 96 97 /*---------------------------------------------------------------------------- 98 ; ENUMERATED TYPEDEF'S 99 ----------------------------------------------------------------------------*/ 100 101 /*---------------------------------------------------------------------------- 102 ; STRUCTURES TYPEDEF'S 103 ----------------------------------------------------------------------------*/ 104 typedef struct 105 { 106 /* history vector of past synthesis speech energy */ 107 Word16 frameEnergyHist[L_ENERGYHIST]; 108 109 /* state flags */ 110 Word16 bgHangover; /* counter; number of frames after last speech frame */ 111 112 } Bgn_scdState; 113 114 /*---------------------------------------------------------------------------- 115 ; GLOBAL FUNCTION DEFINITIONS 116 ; [List function prototypes here] 117 ----------------------------------------------------------------------------*/ 118 /* 119 * Function : Bgn_scd_init 120 * Purpose : Allocates initializes state memory 121 * Description : Stores pointer to filter status struct in *st. This 122 * pointer has to be passed to Bgn_scd in each call. 123 * Returns : 0 on success 124 */ 125 Word16 Bgn_scd_init(Bgn_scdState **st); 126 127 /* 128 * Function : Bgn_scd_reset 129 * Purpose : Resets state memory 130 * Returns : 0 on success 131 */ 132 Word16 Bgn_scd_reset(Bgn_scdState *st); 133 134 /* 135 * Function : Bgn_scd_exit 136 * Purpose : The memory used for state memory is freed 137 * Description : Stores NULL in *s 138 * Returns : void 139 */ 140 void Bgn_scd_exit(Bgn_scdState **st); 141 142 /* 143 * Function : Bgn_scd 144 * Purpose : Charaterice synthesis speech and detect background noise 145 * Returns : background noise decision; 0 = bgn, 1 = no bgn 146 */ 147 Word16 Bgn_scd(Bgn_scdState *st, /* i : State variables for bgn SCD */ 148 Word16 ltpGainHist[], /* i : LTP gain history */ 149 Word16 speech[], /* o : synthesis speech frame */ 150 Word16 *voicedHangover,/* o : # of frames after last voiced frame */ 151 Flag *pOverflow 152 ); 153 154 155 #ifdef __cplusplus 156 } 157 #endif 158 159 #endif /* _BGNSCD_H_ */ 160
