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annotate src/vad.h @ 6:6119d2c1e7d9

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EFR2 encoder: mimic 5 ms delay of AMR
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 07:14:01 +0000
parents 56410792419a
children
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1 /***************************************************************************
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2 *
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3 * File Name: vad.h
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4 *
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5 * Purpose: Contains the prototypes for all functions of voice activity
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6 * detection. Also contains the type definition for the pseudo
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7 * floating point data type.
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8 *
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9 **************************************************************************/
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10
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11 /* Struct for storing pseudo floating point exponent and mantissa */
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12 struct _fp
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13 {
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14 Word16 e; /* exponent */
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15 Word16 m; /* mantissa */
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16 };
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17
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18 typedef struct _fp Pfloat;
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19
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20 void vad_reset (void);
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21
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22 Word16 vad_computation (
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23 Word16 r_h[],
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24 Word16 r_l[],
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25 Word16 scal_acf,
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26 Word16 rc[],
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27 Word16 ptch
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28 );
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29
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30 void energy_computation (
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31 Word16 r_h[],
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32 Word16 scal_acf,
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33 Word16 rvad[],
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34 Word16 scal_rvad,
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35 Pfloat * acf0,
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36 Pfloat * pvad
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37 );
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38
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39 void acf_averaging (
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40 Word16 r_h[],
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41 Word16 r_l[],
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42 Word16 scal_acf,
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43 Word32 L_av0[],
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44 Word32 L_av1[]
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45 );
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46
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47 void predictor_values (
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48 Word32 L_av1[],
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49 Word16 rav1[],
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50 Word16 *scal_rav1
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51 );
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52
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53 void schur_recursion (
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54 Word32 L_av1[],
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55 Word16 vpar[]
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56 );
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57
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58 void step_up (
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59 Word16 np,
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60 Word16 vpar[],
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61 Word16 aav1[]
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62 );
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63
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64 void compute_rav1 (
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65 Word16 aav1[],
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66 Word16 rav1[],
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67 Word16 *scal_rav1
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68 );
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69
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70 Word16 spectral_comparison (
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71 Word16 rav1[],
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72 Word16 scal_rav1,
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73 Word32 L_av0[]
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74 );
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75
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76 void threshold_adaptation (
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77 Word16 stat,
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78 Word16 ptch,
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79 Word16 tone,
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80 Word16 rav1[],
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81 Word16 scal_rav1,
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82 Pfloat pvad,
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83 Pfloat acf0,
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84 Word16 rvad[],
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85 Word16 *scal_rvad,
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86 Pfloat * thvad
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87 );
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88
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89 void tone_detection (
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90 Word16 rc[],
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91 Word16 *tone
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92 );
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93
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94 Word16 vad_decision (
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95 Pfloat pvad,
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96 Pfloat thvad
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97 );
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98
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99 Word16 vad_hangover (
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100 Word16 vvad
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101 );
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102
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103 void periodicity_update (
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104 Word16 lags[],
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105 Word16 *ptch
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106 );