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annotate libtwamr/spreproc.c @ 553:ebcf414b7d99

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doc/TFO-transform: describe details for FRv1, both modes
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 07 Oct 2024 08:24:24 +0000
parents 7e0aeab69b10
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 : spreproc.c
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11 * Purpose : Subframe preprocessing
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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 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "spreproc.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "oper_32b.h"
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32 #include "weight_a.h"
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33 #include "syn_filt.h"
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34 #include "residu.h"
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35 #include "memops.h"
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36 #include "no_count.h"
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37
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38 /*
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39 ********************************************************************************
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40 * PUBLIC PROGRAM CODE
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41 ********************************************************************************
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42 */
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43 int subframePreProc(
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44 enum Mode mode, /* i : coder mode */
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45 const Word16 gamma1[], /* i : spectral exp. factor 1 */
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46 const Word16 gamma1_12k2[],/* i : spectral exp. factor 1 for EFR */
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47 const Word16 gamma2[], /* i : spectral exp. factor 2 */
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48 Word16 *A, /* i : A(z) unquantized for the 4 subframes */
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49 Word16 *Aq, /* i : A(z) quantized for the 4 subframes */
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50 Word16 *speech, /* i : speech segment */
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51 Word16 *mem_err, /* i : pointer to error signal */
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52 Word16 *mem_w0, /* i : memory of weighting filter */
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53 Word16 *zero, /* i : pointer to zero vector */
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54 Word16 ai_zero[], /* o : history of weighted synth. filter */
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55 Word16 exc[], /* o : long term prediction residual */
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56 Word16 h1[], /* o : impulse response */
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57 Word16 xn[], /* o : target vector for pitch search */
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58 Word16 res2[], /* o : long term prediction residual */
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59 Word16 error[] /* o : error of LPC synthesis filter */
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60 )
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61 {
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62 Word16 i;
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63 Word16 Ap1[MP1]; /* A(z) with spectral expansion */
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64 Word16 Ap2[MP1]; /* A(z) with spectral expansion */
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65 const Word16 *g1; /* Pointer to correct gammma1 vector */
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66
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67 /*---------------------------------------------------------------*
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68 * mode specific pointer to gamma1 values *
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69 *---------------------------------------------------------------*/
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70 test (); test ();
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71 if ( sub(mode, MR122) == 0 || sub(mode, MR102) == 0 )
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72 {
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73 g1 = gamma1_12k2; move16 ();
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74 }
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75 else
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76 {
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77 g1 = gamma1; move16 ();
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78 }
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79 /*---------------------------------------------------------------*
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80 * Find the weighted LPC coefficients for the weighting filter. *
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81 *---------------------------------------------------------------*/
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82 Weight_Ai(A, g1, Ap1);
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83 Weight_Ai(A, gamma2, Ap2);
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84
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85 /*---------------------------------------------------------------*
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86 * Compute impulse response, h1[], of weighted synthesis filter *
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87 *---------------------------------------------------------------*/
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88 for (i = 0; i <= M; i++)
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89 {
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90 ai_zero[i] = Ap1[i]; move16 ();
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91 }
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92
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93 Syn_filt(Aq, ai_zero, h1, L_SUBFR, zero, 0);
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94 Syn_filt(Ap2, h1, h1, L_SUBFR, zero, 0);
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95
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96 /*------------------------------------------------------------------------*
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97 * *
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98 * Find the target vector for pitch search: *
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99 * *
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100 *------------------------------------------------------------------------*/
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101
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102 /* LPC residual */
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103 Residu(Aq, speech, res2, L_SUBFR);
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104 Copy(res2, exc, L_SUBFR);
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105
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106 Syn_filt(Aq, exc, error, L_SUBFR, mem_err, 0);
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107
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108 Residu(Ap1, error, xn, L_SUBFR);
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109
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110 /* target signal xn[]*/
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111 Syn_filt(Ap2, xn, xn, L_SUBFR, mem_w0, 0);
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112
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113 return 0;
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114 }