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annotate libtwamr/vad1.h @ 408:8847c1740e78

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libtwamr: integrate VAD1
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 07 May 2024 00:56:10 +0000
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1 /*
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2 ********************************************************************************
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3 **-------------------------------------------------------------------------**
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4 ** **
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5 ** GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 **
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6 ** R99 Version 3.3.0 **
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7 ** REL-4 Version 4.1.0 **
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8 ** **
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9 **-------------------------------------------------------------------------**
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10 ********************************************************************************
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11 *
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12 * File : vad1.h
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13 * Purpose : Voice Activity Detection (VAD) for AMR (option 1)
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14 *
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15 ********************************************************************************
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16 */
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17 #ifndef vad1_h
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18 #define vad1_h "$Id $"
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19
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20 /*
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21 ********************************************************************************
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22 * INCLUDE FILES
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23 ********************************************************************************
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24 */
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25 #include "typedef.h"
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26 #include "cnst_vad.h"
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27
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28 /*
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29 ********************************************************************************
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30 * LOCAL VARIABLES AND TABLES
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31 ********************************************************************************
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32 */
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33
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34 /*
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35 ********************************************************************************
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36 * DEFINITION OF DATA TYPES
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37 ********************************************************************************
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38 */
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39
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40 /* state variable */
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41 typedef struct {
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42
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43 Word16 bckr_est[COMPLEN]; /* background noise estimate */
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44 Word16 ave_level[COMPLEN]; /* averaged input components for stationary */
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45 /* estimation */
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46 Word16 old_level[COMPLEN]; /* input levels of the previous frame */
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47 Word16 sub_level[COMPLEN]; /* input levels calculated at the end of
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48 a frame (lookahead) */
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49 Word16 a_data5[3][2]; /* memory for the filter bank */
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50 Word16 a_data3[5]; /* memory for the filter bank */
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51
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52 Word16 burst_count; /* counts length of a speech burst */
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53 Word16 hang_count; /* hangover counter */
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54 Word16 stat_count; /* stationary counter */
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55
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56 /* Note that each of the following three variables (vadreg, pitch and tone)
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57 holds 15 flags. Each flag reserves 1 bit of the variable. The newest
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58 flag is in the bit 15 (assuming that LSB is bit 1 and MSB is bit 16). */
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59 Word16 vadreg; /* flags for intermediate VAD decisions */
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60 Word16 pitch; /* flags for pitch detection */
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61 Word16 tone; /* flags for tone detection */
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62 Word16 complex_high; /* flags for complex detection */
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63 Word16 complex_low; /* flags for complex detection */
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64
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65 Word16 oldlag_count, oldlag; /* variables for pitch detection */
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66
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67 Word16 complex_hang_count; /* complex hangover counter, used by VAD */
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68 Word16 complex_hang_timer; /* hangover initiator, used by CAD */
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69
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70 Word16 best_corr_hp; /* FIP filtered value Q15 */
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71
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72 Word16 speech_vad_decision; /* final decision */
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73 Word16 complex_warning; /* complex background warning */
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74
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75 Word16 sp_burst_count; /* counts length of a speech burst incl
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76 HO addition */
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77 Word16 corr_hp_fast; /* filtered value */
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78 } vadState1;
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79
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80 /*
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81 ********************************************************************************
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82 * DECLARATION OF PROTOTYPES
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83 ********************************************************************************
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84 */
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85
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86 void vad1_reset (vadState1 *st);
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87 /* reset of pre processing state (i.e. set state memory to zero)
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88 returns 0 on success
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89 */
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90
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91 void vad_complex_detection_update (vadState1 *st, /* i/o : State struct */
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92 Word16 best_corr_hp /* i : best Corr Q15 */
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93 );
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94
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95 void vad_tone_detection (vadState1 *st, /* i/o : State struct */
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96 Word32 t0, /* i : autocorrelation maxima */
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97 Word32 t1 /* i : energy */
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98 );
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99
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100 void vad_tone_detection_update (
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101 vadState1 *st, /* i/o : State struct */
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102 Word16 one_lag_per_frame /* i : 1 if one open-loop lag is
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103 calculated per each frame,
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104 otherwise 0 */
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105 );
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106
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107 void vad_pitch_detection (vadState1 *st, /* i/o : State struct */
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108 Word16 lags[] /* i : speech encoder open loop lags */
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109 );
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110
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111 Word16 vad1 (vadState1 *st, /* i/o : State struct */
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112 Word16 in_buf[] /* i : samples of the input frame
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113 inbuf[159] is the very last sample,
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114 incl lookahead */
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115 );
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116 #endif