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 Filename: /audio/gsm_amr/c/include/vad_1.h 32 33 ------------------------------------------------------------------------------ 34 REVISION HISTORY 35 36 Description: Placed header file in the proper template format. Added 37 parameter pOverflow for the basic math ops. 38 39 Description: Replaced "int" and/or "char" with OSCL defined types. 40 41 Description: Moved _cplusplus #ifdef after Include section. 42 43 Description: 44 45 ------------------------------------------------------------------------------ 46 INCLUDE DESCRIPTION 47 48 This file contains all the constant definitions, prototype and structure 49 definitions needed by vad_1.c 50 51 ------------------------------------------------------------------------------ 52 */ 53 54 /*---------------------------------------------------------------------------- 55 ; CONTINUE ONLY IF NOT ALREADY DEFINED 56 ----------------------------------------------------------------------------*/ 57 #ifndef vad_1_h 58 #define vad_1_h "$Id $" 59 60 /*---------------------------------------------------------------------------- 61 ; INCLUDES 62 ----------------------------------------------------------------------------*/ 63 #include "typedef.h" 64 #include "cnst_vad.h" 65 66 /*--------------------------------------------------------------------------*/ 67 #ifdef __cplusplus 68 extern "C" 69 { 70 #endif 71 72 /*---------------------------------------------------------------------------- 73 ; MACROS 74 ; Define module specific macros here 75 ----------------------------------------------------------------------------*/ 76 77 /*---------------------------------------------------------------------------- 78 ; DEFINES 79 ; Include all pre-processor statements here. 80 ----------------------------------------------------------------------------*/ 81 82 /*---------------------------------------------------------------------------- 83 ; EXTERNAL VARIABLES REFERENCES 84 ; Declare variables used in this module but defined elsewhere 85 ----------------------------------------------------------------------------*/ 86 87 /*---------------------------------------------------------------------------- 88 ; SIMPLE TYPEDEF'S 89 ----------------------------------------------------------------------------*/ 90 91 /*---------------------------------------------------------------------------- 92 ; ENUMERATED TYPEDEF'S 93 ----------------------------------------------------------------------------*/ 94 95 /*---------------------------------------------------------------------------- 96 ; STRUCTURES TYPEDEF'S 97 ----------------------------------------------------------------------------*/ 98 /* state variable */ 99 typedef struct 100 { 101 102 Word16 bckr_est[COMPLEN]; /* background noise estimate */ 103 Word16 ave_level[COMPLEN]; /* averaged input components for stationary */ 104 /* estimation */ 105 Word16 old_level[COMPLEN]; /* input levels of the previous frame */ 106 Word16 sub_level[COMPLEN]; /* input levels calculated at the end of 107 a frame (lookahead) */ 108 Word16 a_data5[3][2]; /* memory for the filter bank */ 109 Word16 a_data3[5]; /* memory for the filter bank */ 110 111 Word16 burst_count; /* counts length of a speech burst */ 112 Word16 hang_count; /* hangover counter */ 113 Word16 stat_count; /* stationary counter */ 114 115 /* Note that each of the following three variables (vadreg, pitch and tone) 116 holds 15 flags. Each flag reserves 1 bit of the variable. The newest 117 flag is in the bit 15 (assuming that LSB is bit 1 and MSB is bit 16). */ 118 Word16 vadreg; /* flags for intermediate VAD decisions */ 119 Word16 pitch; /* flags for pitch detection */ 120 Word16 tone; /* flags for tone detection */ 121 Word16 complex_high; /* flags for complex detection */ 122 Word16 complex_low; /* flags for complex detection */ 123 124 Word16 oldlag_count, oldlag; /* variables for pitch detection */ 125 126 Word16 complex_hang_count; /* complex hangover counter, used by VAD */ 127 Word16 complex_hang_timer; /* hangover initiator, used by CAD */ 128 129 Word16 best_corr_hp; /* FIP filtered value Q15 */ 130 131 Word16 speech_vad_decision; /* final decision */ 132 Word16 complex_warning; /* complex background warning */ 133 134 Word16 sp_burst_count; /* counts length of a speech burst incl */ 135 Word16 corr_hp_fast; /* filtered value */ 136 } vadState1; 137 /*---------------------------------------------------------------------------- 138 ; GLOBAL FUNCTION DEFINITIONS 139 ; Function Prototype declaration 140 ----------------------------------------------------------------------------*/ 141 Word16 vad1_init(vadState1 **st); 142 /* initialize one instance of the pre processing state. 143 Stores pointer to filter status struct in *st. This pointer has to 144 be passed to vad in each call. 145 returns 0 on success 146 */ 147 148 Word16 vad1_reset(vadState1 *st); 149 /* reset of pre processing state (i.e. set state memory to zero) 150 returns 0 on success 151 */ 152 153 void vad1_exit(vadState1 **st); 154 /* de-initialize pre processing state (i.e. free status struct) 155 stores NULL in *st 156 */ 157 158 void vad_complex_detection_update(vadState1 *st, /* i/o : State struct */ 159 Word16 best_corr_hp /* i : best Corr Q15 */ 160 ); 161 162 void vad_tone_detection(vadState1 *st, /* i/o : State struct */ 163 Word32 t0, /* i : autocorrelation maxima */ 164 Word32 t1, /* i : energy */ 165 Flag *pOverflow 166 ); 167 168 void vad_tone_detection_update( 169 vadState1 *st, /* i/o : State struct */ 170 Word16 one_lag_per_frame, /* i : 1 if one open-loop lag is 171 calculated per each frame, 172 otherwise 0 */ 173 Flag *pOverflow 174 ); 175 176 void vad_pitch_detection(vadState1 *st, /* i/o : State struct */ 177 Word16 lags[], /* i : speech encoder open loop lags */ 178 Flag *pOverflow 179 ); 180 181 Word16 vad1(vadState1 *st, /* i/o : State struct */ 182 Word16 in_buf[], /* i : samples of the input frame 183 inbuf[159] is the very last sample, 184 incl lookahead */ 185 Flag *pOverflow 186 ); 187 188 /*---------------------------------------------------------------------------- 189 ; END 190 ----------------------------------------------------------------------------*/ 191 #ifdef __cplusplus 192 } 193 #endif 194 195 #endif /* _VAD1_H_ */ 196 197 198
