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annotate libgsmefr/sig_proc.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 988fd7ff514f
children
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1 /*--------------------------------------------------------------*
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2 * Function prototypes for general SIGnal PROCessing functions. *
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3 *--------------------------------------------------------------*/
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4
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5 /* Mathematic functions */
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6
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7 Word32 Inv_sqrt ( /* (o) : output value (range: 0<=val<1) */
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8 Word32 L_x /* (i) : input value (range: 0<=val<=7fffffff) */
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9 );
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10 void Log2 (
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11 Word32 L_x, /* (i) : input value */
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12 Word16 *exponent, /* (o) : Integer part of Log2. (range: 0<=val<=30) */
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13 Word16 *fraction /* (o) : Fractional part of Log2. (range: 0<=val<1)*/
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14 );
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15 Word32 Pow2 ( /* (o) : result (range: 0<=val<=0x7fffffff) */
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16 Word16 exponent, /* (i) : Integer part. (range: 0<=val<=30) */
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17 Word16 fraction /* (i) : Fractional part. (range: 0.0<=val<1.0) */
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18 );
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19
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20 /* General signal processing */
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21
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22 void Init_Pre_Process (struct EFR_encoder_state *st);
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23 void Pre_Process (
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24 struct EFR_encoder_state *st,
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25 Word16 signal[], /* Input/output signal */
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26 Word16 lg /* Lenght of signal */
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27 );
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28
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29 Word16 Autocorr (
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30 Word16 x[], /* (i) : Input signal */
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31 Word16 m, /* (i) : LPC order */
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32 Word16 r_h[], /* (o) : Autocorrelations (msb) */
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33 Word16 r_l[], /* (o) : Autocorrelations (lsb) */
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34 const Word16 wind[]/* (i) : window for LPC analysis. */
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35 );
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36 void Lag_window (
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37 Word16 m, /* (i) : LPC order */
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38 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */
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39 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */
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40 );
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41 void Levinson (
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42 struct EFR_encoder_state *st,
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43 Word16 Rh[], /* (i) : Rh[m+1] Vector of autocorrelations (msb) */
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44 Word16 Rl[], /* (i) : Rl[m+1] Vector of autocorrelations (lsb) */
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45 Word16 A[], /* (o) : A[m] LPC coefficients (m = 10) */
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46 Word16 rc[] /* (o) : rc[4] First 4 reflection coefficients */
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47 );
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48 void Az_lsp (
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49 Word16 a[], /* (i) : predictor coefficients */
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50 Word16 lsp[], /* (o) : line spectral pairs */
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51 Word16 old_lsp[] /* (i) : old lsp[] (in case not found 10 roots) */
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52 );
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53 void Lsp_Az (
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54 Word16 lsp[], /* (i) : line spectral frequencies */
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55 Word16 a[] /* (o) : predictor coefficients (order = 10) */
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56 );
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57 void Lsf_lsp (
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58 Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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59 Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */
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60 Word16 m /* (i) : LPC order */
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61 );
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62 void Lsp_lsf (
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63 Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */
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64 Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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65 Word16 m /* (i) : LPC order */
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66 );
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67 void Reorder_lsf (
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68 Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */
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69 Word16 min_dist, /* (i) : minimum required distance */
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70 Word16 n /* (i) : LPC order */
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71 );
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72 void Weight_Fac (
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73 Word16 gamma, /* (i) : Spectral expansion. */
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74 Word16 fac[] /* (i/o) : Computed factors. */
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75 );
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76 void Weight_Ai (
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77 Word16 a[], /* (i) : a[m+1] LPC coefficients (m=10) */
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78 const Word16 fac[],/* (i) : Spectral expansion factors. */
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79 Word16 a_exp[] /* (o) : Spectral expanded LPC coefficients */
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80 );
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81 void Residu (
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82 Word16 a[], /* (i) : prediction coefficients */
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83 Word16 x[], /* (i) : speech signal */
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84 Word16 y[], /* (o) : residual signal */
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85 Word16 lg /* (i) : size of filtering */
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86 );
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87 void Syn_filt (
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88 Word16 a[], /* (i) : a[m+1] prediction coefficients (m=10) */
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89 Word16 x[], /* (i) : input signal */
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90 Word16 y[], /* (o) : output signal */
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91 Word16 lg, /* (i) : size of filtering */
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92 Word16 mem[], /* (i/o): memory associated with this filtering. */
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93 Word16 update /* (i) : 0=no update, 1=update of memory. */
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94 );
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95 void Convolve (
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96 Word16 x[], /* (i) : input vector */
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97 Word16 h[], /* (i) : impulse response */
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98 Word16 y[], /* (o) : output vector */
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99 Word16 L /* (i) : vector size */
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100 );
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101 void agc (
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102 struct EFR_decoder_state *st,
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103 Word16 *sig_in, /* (i) : postfilter input signal */
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104 Word16 *sig_out, /* (i/o): postfilter output signal */
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105 Word16 agc_fac, /* (i) : AGC factor */
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106 Word16 l_trm /* (i) : subframe size */
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107 );
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108 void agc2 (
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109 Word16 *sig_in, /* (i) : postfilter input signal */
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110 Word16 *sig_out, /* (i/o): postfilter output signal */
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111 Word16 l_trm /* (i) : subframe size */
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112 );
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113 void preemphasis (
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114 struct EFR_decoder_state *st,
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115 Word16 *signal, /* (i/o): input signal overwritten by the output */
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116 Word16 g, /* (i) : preemphasis coefficient */
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117 Word16 L /* (i) : size of filtering */
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118 );