FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/ton_stab.c @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 8fff74ca83e8
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 : ton_stab.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 "ton_stab.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 "oper_32b.h"
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32 #include "cnst.h"
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33 #include "memops.h"
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34
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35 /*
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36 *****************************************************************************
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37 * LOCAL VARIABLES AND TABLES
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38 *****************************************************************************
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39 */
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40
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41 /*
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42 *****************************************************************************
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43 * PUBLIC PROGRAM CODE
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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: ton_stab_reset
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50 * Purpose: Initializes state memory to zero
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51 *
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52 **************************************************************************
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53 */
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54 void ton_stab_reset (tonStabState *st)
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55 {
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56 /* initialize tone stabilizer state */
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57 st->count = 0;
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58 Set_zero(st->gp, N_FRAME); /* Init Gp_Clipping */
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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 * Function: check_lsp() *
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64 * Purpose: Check the LSP's to detect resonances *
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65 * *
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66 ****************************************************************************
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67 */
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68 Word16 check_lsp(tonStabState *st, /* i/o : State struct */
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69 Word16 *lsp /* i : unquantized LSP's */
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70 )
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71 {
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72 Word16 i, dist, dist_min1, dist_min2, dist_th;
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73
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74 /* Check for a resonance: */
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75 /* Find minimum distance between lsp[i] and lsp[i+1] */
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76
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77 dist_min1 = MAX_16; move16 ();
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78 for (i = 3; i < M-2; i++)
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79 {
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80 dist = sub(lsp[i], lsp[i+1]);
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81
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82 test ();
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83 if (sub(dist, dist_min1) < 0)
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84 {
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85 dist_min1 = dist; move16 ();
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86 }
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87 }
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88
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89 dist_min2 = MAX_16; move16 ();
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90 for (i = 1; i < 3; i++)
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91 {
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92 dist = sub(lsp[i], lsp[i+1]);
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93
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94 test ();
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95 if (sub(dist, dist_min2) < 0)
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96 {
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97 dist_min2 = dist; move16 ();
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98 }
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99 }
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100
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101 if (test (), sub(lsp[1], 32000) > 0)
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102 {
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103 dist_th = 600; move16 ();
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104 }
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105 else if (test (), sub(lsp[1], 30500) > 0)
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106 {
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107 dist_th = 800; move16 ();
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108 }
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109 else
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110 {
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111 dist_th = 1100; move16 ();
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112 }
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113
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114 test (); test ();
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115 if (sub(dist_min1, 1500) < 0 ||
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116 sub(dist_min2, dist_th) < 0)
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117 {
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118 st->count = add(st->count, 1);
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119 }
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120 else
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121 {
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122 st->count = 0; move16 ();
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123 }
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124
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125 /* Need 12 consecutive frames to set the flag */
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126 test ();
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127 if (sub(st->count, 12) >= 0)
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128 {
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129 st->count = 12; move16 ();
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130 return 1;
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131 }
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132 else
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133 {
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134 return 0;
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135 }
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136 }
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137
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138 /***************************************************************************
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139 *
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140 * Function: Check_Gp_Clipping()
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141 * Purpose: Verify that the sum of the last (N_FRAME+1) pitch
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142 * gains is under a certain threshold.
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143 *
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144 ***************************************************************************
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145 */
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146 Word16 check_gp_clipping(tonStabState *st, /* i/o : State struct */
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147 Word16 g_pitch /* i : pitch gain */
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148 )
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149 {
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150 Word16 i, sum;
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151
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152 sum = shr(g_pitch, 3); /* Division by 8 */
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153 for (i = 0; i < N_FRAME; i++)
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154 {
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155 sum = add(sum, st->gp[i]);
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156 }
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157
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158 test ();
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159 if (sub(sum, GP_CLIP) > 0)
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160 {
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161 return 1;
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162 }
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163 else
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164 {
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165 return 0;
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166 }
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167 }
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168
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169 /***************************************************************************
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170 *
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171 * Function: Update_Gp_Clipping()
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172 * Purpose: Update past pitch gain memory
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173 *
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174 ***************************************************************************
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175 */
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176 void update_gp_clipping(tonStabState *st, /* i/o : State struct */
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177 Word16 g_pitch /* i : pitch gain */
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178 )
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179 {
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180 Copy(&st->gp[1], &st->gp[0], N_FRAME-1);
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181 st->gp[N_FRAME-1] = shr(g_pitch, 3);
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182 }