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annotate libtwamr/lsp.c @ 556:18aca50d68df default tip

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doc/Calypso-TCH-downlink: update for FR1 BFI-with-data
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 11 Oct 2024 01:54:00 +0000
parents 550d3594c878
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 : lsp.c
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11 * Purpose : From A(z) to lsp. LSP quantization and interpolation
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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 "lsp.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 "tw_amr.h"
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "oper_32b.h"
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33 #include "q_plsf.h"
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34 #include "memops.h"
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35 #include "az_lsp.h"
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36 #include "int_lpc.h"
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37 #include "no_count.h"
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38 #include "lsp_tab.h"
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39
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40 /*
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41 ********************************************************************************
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42 * PUBLIC PROGRAM CODE
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43 ********************************************************************************
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44 */
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45
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46 /*
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47 **************************************************************************
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48 *
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49 * Function : lsp_reset
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50 *
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51 **************************************************************************
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52 */
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53 void lsp_reset (lspState *st)
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54 {
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55 /* Init lsp_old[] */
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56 Copy(lsp_init_data, &st->lsp_old[0], M);
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57
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58 /* Initialize lsp_old_q[] */
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59 Copy(st->lsp_old, st->lsp_old_q, M);
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60
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61 /* Reset quantization state */
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62 Q_plsf_reset(&st->qSt);
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63 }
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64
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65 /*************************************************************************
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66 *
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67 * FUNCTION: lsp()
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68 *
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69 ************************************************************************/
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70 int lsp(lspState *st, /* i/o : State struct */
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71 enum Mode req_mode, /* i : requested coder mode */
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72 enum Mode used_mode, /* i : used coder mode */
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73 Word16 az[], /* i/o : interpolated LP parameters Q12 */
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74 Word16 azQ[], /* o : quantization interpol. LP parameters Q12*/
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75 Word16 lsp_new[], /* o : new lsp vector */
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76 Word16 **anap /* o : analysis parameters */)
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77 {
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78 Word16 lsp_new_q[M]; /* LSPs at 4th subframe */
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79 Word16 lsp_mid[M], lsp_mid_q[M]; /* LSPs at 2nd subframe */
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80
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81 Word16 pred_init_i; /* init index for MA prediction in DTX mode */
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82
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83 test ();
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84 if ( sub (req_mode, MR122) == 0)
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85 {
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86 Az_lsp (&az[MP1], lsp_mid, st->lsp_old);
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87 Az_lsp (&az[MP1 * 3], lsp_new, lsp_mid);
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88
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89 /*--------------------------------------------------------------------*
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90 * Find interpolated LPC parameters in all subframes (both quantized *
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91 * and unquantized). *
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92 * The interpolated parameters are in array A_t[] of size (M+1)*4 *
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93 * and the quantized interpolated parameters are in array Aq_t[] *
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94 *--------------------------------------------------------------------*/
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95 Int_lpc_1and3_2 (st->lsp_old, lsp_mid, lsp_new, az);
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96
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97 test ();
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98 if ( sub (used_mode, MRDTX) != 0)
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99 {
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100 /* LSP quantization (lsp_mid[] and lsp_new[] jointly quantized) */
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101 Q_plsf_5 (&st->qSt, lsp_mid, lsp_new, lsp_mid_q, lsp_new_q, *anap);
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102
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103 Int_lpc_1and3 (st->lsp_old_q, lsp_mid_q, lsp_new_q, azQ);
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104
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105 /* Advance analysis parameters pointer */
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106 (*anap) += add(0,5); move16 ();
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107 }
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108 }
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109 else
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110 {
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111 Az_lsp(&az[MP1 * 3], lsp_new, st->lsp_old); /* From A(z) to lsp */
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112
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113 /*--------------------------------------------------------------------*
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114 * Find interpolated LPC parameters in all subframes (both quantized *
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115 * and unquantized). *
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116 * The interpolated parameters are in array A_t[] of size (M+1)*4 *
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117 * and the quantized interpolated parameters are in array Aq_t[] *
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118 *--------------------------------------------------------------------*/
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119
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120 Int_lpc_1to3_2(st->lsp_old, lsp_new, az);
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121
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122 test ();
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123 if ( sub (used_mode, MRDTX) != 0)
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124 {
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125 /* LSP quantization */
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126 Q_plsf_3(&st->qSt, req_mode, lsp_new, lsp_new_q, *anap, &pred_init_i);
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127
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128 Int_lpc_1to3(st->lsp_old_q, lsp_new_q, azQ);
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129
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130 /* Advance analysis parameters pointer */
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131 (*anap) += add (0, 3); move16 ();
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132 }
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133 }
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134
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135 /* update the LSPs for the next frame */
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136 Copy (lsp_new, st->lsp_old, M);
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137 Copy (lsp_new_q, st->lsp_old_q, M);
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138
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139 return 0;
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140 }