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annotate libtwamr/vad2.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 0152c069d01f
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : vad2.h
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11 * Purpose : Voice Activity Detection (VAD) for AMR (option 2)
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12 *
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13 ********************************************************************************
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14 */
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15
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16 #ifndef vad2_h
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17 #define vad2_h "$Id $"
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18
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19 #include "typedef.h"
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20
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21 /***** Defines ****/
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22
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23 #define YES 1
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24 #define NO 0
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25 #define ON 1
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26 #define OFF 0
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27 #define TRUE 1
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28 #define FALSE 0
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29
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30 #define FRM_LEN 80
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31 #define DELAY 24
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32 #define FFT_LEN 128
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33
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34 #define NUM_CHAN 16
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35 #define LO_CHAN 0
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36 #define HI_CHAN 15
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37
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38 #define UPDATE_THLD 35
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39 #define HYSTER_CNT_THLD 6
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40 #define UPDATE_CNT_THLD 50
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41
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42 #define SHIFT_STATE_0 0 /* channel energy scaled as 22,9 */
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43 #define SHIFT_STATE_1 1 /* channel energy scaled as 27,4 */
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44
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45 #define NOISE_FLOOR_CHAN_0 512 /* 1.0 scaled as 22,9 */
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46 #define MIN_CHAN_ENRG_0 32 /* 0.0625 scaled as 22,9 */
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47 #define MIN_NOISE_ENRG_0 32 /* 0.0625 scaled as 22,9 */
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48 #define INE_NOISE_0 8192 /* 16.0 scaled as 22,9 */
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49 #define FRACTIONAL_BITS_0 9 /* used as input to fn10Log10() */
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50
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51 #define NOISE_FLOOR_CHAN_1 16 /* 1.0 scaled as 27,4 */
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52 #define MIN_CHAN_ENRG_1 1 /* 0.0625 scaled as 27,4 */
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53 #define MIN_NOISE_ENRG_1 1 /* 0.0625 scaled as 27,4 */
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54 #define INE_NOISE_1 256 /* 16.0 scaled as 27,4 */
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55 #define FRACTIONAL_BITS_1 4 /* used as input to fn10Log10() */
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56
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57 #define STATE_1_TO_0_SHIFT_R (FRACTIONAL_BITS_1-FRACTIONAL_BITS_0) /* state correction factor */
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58 #define STATE_0_TO_1_SHIFT_R (FRACTIONAL_BITS_0-FRACTIONAL_BITS_1) /* state correction factor */
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59
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60 #define HIGH_ALPHA 29491 /* 0.9 scaled as 0,15 */
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61 #define LOW_ALPHA 22938 /* 0.7 scaled as 0,15 */
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62 #define ALPHA_RANGE (HIGH_ALPHA - LOW_ALPHA)
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63 #define DEV_THLD 7168 /* 28.0 scaled as 7,8 */
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64
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65 #define PRE_EMP_FAC (-26214) /* -0.8 scaled as 0,15 */
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66
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67 #define CEE_SM_FAC 18022 /* 0.55 scaled as 0,15 */
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68 #define ONE_MINUS_CEE_SM_FAC 14746 /* 0.45 scaled as 0,15 */
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69
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70 #define CNE_SM_FAC 3277 /* 0.1 scaled as 0,15 */
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71 #define ONE_MINUS_CNE_SM_FAC 29491 /* 0.9 scaled as 0,15 */
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72
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73 #define FFT_HEADROOM 2
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74
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75
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76 typedef struct
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77 {
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78 Word16 pre_emp_mem;
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79 Word16 update_cnt;
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80 Word16 hyster_cnt;
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81 Word16 last_update_cnt;
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82 Word16 ch_enrg_long_db[NUM_CHAN]; /* scaled as 7,8 */
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83
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84 Word32 Lframe_cnt;
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85 Word32 Lch_enrg[NUM_CHAN]; /* scaled as 22,9 or 27,4 */
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86 Word32 Lch_noise[NUM_CHAN]; /* scaled as 22,9 */
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87
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88 Word16 last_normb_shift; /* last block norm shift count */
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89
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90 Word16 tsnr; /* total signal-to-noise ratio in dB (scaled as 7,8) */
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91 Word16 hangover;
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92 Word16 burstcount;
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93 Word16 fupdate_flag; /* forced update flag from previous frame */
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94 Word16 negSNRvar; /* Negative SNR variance (scaled as 7,8) */
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95 Word16 negSNRbias; /* sensitivity bias from negative SNR variance (scaled as 15,0) */
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96
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97 Word16 shift_state; /* use 22,9 or 27,4 scaling for ch_enrg[] */
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98
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99 Word32 L_R0;
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100 Word32 L_Rmax;
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101 Flag LTP_flag; /* Use to indicate the the LTP gain is > LTP_THRESH */
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102
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103 } vadState2;
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104
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105 /**** Prototypes ****/
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106
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107 Word16 vad2 (Word16 *farray_ptr, vadState2 *st);
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108 void vad2_reset (vadState2 *st);
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109
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110 void r_fft (Word16 *farray_ptr);
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111 void LTP_flag_update (vadState2 *st, Word16 mode);
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112
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113 #endif