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annotate libtwamr/d_plsf_5.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 29769a9b89d3
children
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29769a9b89d3 libtwamr: integrate d_plsf_5.c
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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 : d_plsf_5.c
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11 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 *****************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "d_plsf.h"
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22
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23 /*
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24 *****************************************************************************
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25 * INCLUDE FILES
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26 *****************************************************************************
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27 */
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28 #include "typedef.h"
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29 #include "basic_op.h"
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30 #include "no_count.h"
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31 #include "lsp_lsf.h"
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32 #include "reorder.h"
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33 #include "cnst.h"
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34 #include "memops.h"
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35 #include "q_plsf5_tab.h"
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36
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37 /*
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38 *****************************************************************************
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39 * LOCAL VARIABLES AND TABLES
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40 *****************************************************************************
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41 */
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42
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43 /* ALPHA -> 0.95 */
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44 /* ONE_ALPHA-> (1.0-ALPHA) */
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45 #define ALPHA 31128
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46 #define ONE_ALPHA 1639
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47
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48 /*
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49 *--------------------------------------------------*
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50 * Constants (defined in cnst.h) *
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51 *--------------------------------------------------*
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52 * M : LPC order
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53 *--------------------------------------------------*
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54 */
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55
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56 /*
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57 *****************************************************************************
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58 * PUBLIC PROGRAM CODE
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59 *****************************************************************************
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60 */
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61 /*
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62 **************************************************************************
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63 *
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64 * Function : D_plsf_5
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65 * Purpose : Decodes the 2 sets of LSP parameters in a frame
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66 * using the received quantization indices.
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67 *
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68 **************************************************************************
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69 */
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70 int D_plsf_5 (
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71 D_plsfState *st, /* i/o: State variables */
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72 Word16 bfi, /* i : bad frame indicator (set to 1 if a bad
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73 frame is received) */
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74 Word16 *indice, /* i : quantization indices of 5 submatrices, Q0 */
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75 Word16 *lsp1_q, /* o : quantized 1st LSP vector (M), Q15 */
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76 Word16 *lsp2_q /* o : quantized 2nd LSP vector (M), Q15 */
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77 )
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78 {
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79 Word16 i;
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80 const Word16 *p_dico;
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81 Word16 temp, sign;
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82 Word16 lsf1_r[M], lsf2_r[M];
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83 Word16 lsf1_q[M], lsf2_q[M];
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84
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85 test ();
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86 if (bfi != 0) /* if bad frame */
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87 {
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88 /* use the past LSFs slightly shifted towards their mean */
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89
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90 for (i = 0; i < M; i++)
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91 {
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92 /* lsfi_q[i] = ALPHA*st->past_lsf_q[i] + ONE_ALPHA*mean_lsf[i]; */
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93
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94 lsf1_q[i] = add (mult (st->past_lsf_q[i], ALPHA),
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95 mult (mean_lsf[i], ONE_ALPHA));
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96 move16 ();
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97
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98 lsf2_q[i] = lsf1_q[i]; move16 ();
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99 }
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100
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101 /* estimate past quantized residual to be used in next frame */
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102
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103 for (i = 0; i < M; i++)
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104 {
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105 /* temp = mean_lsf[i] + st->past_r_q[i] * LSP_PRED_FAC_MR122; */
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106
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107 temp = add (mean_lsf[i], mult (st->past_r_q[i],
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108 LSP_PRED_FAC_MR122));
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109
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110 st->past_r_q[i] = sub (lsf2_q[i], temp);
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111 move16 ();
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112 }
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113 }
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114 else
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115 /* if good LSFs received */
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116 {
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117 /* decode prediction residuals from 5 received indices */
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118
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119 p_dico = &dico1_lsf[shl (indice[0], 2)];move16 ();
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120 lsf1_r[0] = *p_dico++; move16 ();
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121 lsf1_r[1] = *p_dico++; move16 ();
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122 lsf2_r[0] = *p_dico++; move16 ();
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123 lsf2_r[1] = *p_dico++; move16 ();
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124
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125 p_dico = &dico2_lsf[shl (indice[1], 2)];move16 ();
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126 lsf1_r[2] = *p_dico++; move16 ();
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127 lsf1_r[3] = *p_dico++; move16 ();
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128 lsf2_r[2] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 lsf2_r[3] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 sign = indice[2] & 1; logic16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 i = shr (indice[2], 1);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 p_dico = &dico3_lsf[shl (i, 2)]; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 test ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 if (sign == 0)
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 {
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 lsf1_r[4] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 lsf1_r[5] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 lsf2_r[4] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 lsf2_r[5] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 }
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 else
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 {
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 lsf1_r[4] = negate (*p_dico++); move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 lsf1_r[5] = negate (*p_dico++); move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 lsf2_r[4] = negate (*p_dico++); move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 lsf2_r[5] = negate (*p_dico++); move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 }
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 p_dico = &dico4_lsf[shl (indice[3], 2)];move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 lsf1_r[6] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 lsf1_r[7] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 lsf2_r[6] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 lsf2_r[7] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 p_dico = &dico5_lsf[shl (indice[4], 2)];move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 lsf1_r[8] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 lsf1_r[9] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 lsf2_r[8] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 lsf2_r[9] = *p_dico++; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 /* Compute quantized LSFs and update the past quantized residual */
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 for (i = 0; i < M; i++)
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 {
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 temp = add (mean_lsf[i], mult (st->past_r_q[i],
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 LSP_PRED_FAC_MR122));
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 lsf1_q[i] = add (lsf1_r[i], temp);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 lsf2_q[i] = add (lsf2_r[i], temp);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 st->past_r_q[i] = lsf2_r[i]; move16 ();
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 }
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 }
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 /* verification that LSFs have minimum distance of LSF_GAP Hz */
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 Reorder_lsf (lsf1_q, LSF_GAP, M);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 Reorder_lsf (lsf2_q, LSF_GAP, M);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 Copy (lsf2_q, st->past_lsf_q, M);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 /* convert LSFs to the cosine domain */
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 Lsf_lsp (lsf1_q, lsp1_q, M);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 Lsf_lsp (lsf2_q, lsp2_q, M);
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 return 0;
29769a9b89d3 libtwamr: integrate d_plsf_5.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 }