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annotate libtwamr/ec_gains.h @ 483:4f13db3a7086

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doc/Utils-overview: document new utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:26:12 +0000
parents 9cbd1b5d061f
children
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9cbd1b5d061f libtwamr: integrate ec_gains.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 : ec_gains.h
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11 * Purpose: : Error concealment for pitch and codebook gains
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef ec_gains_h
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16 #define ec_gains_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "typedef.h"
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24 #include "gc_pred.h"
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25
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26 /*
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27 ********************************************************************************
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28 * LOCAL VARIABLES AND TABLES
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29 ********************************************************************************
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30 */
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31
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32 /*
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33 ********************************************************************************
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34 * DEFINITION OF DATA TYPES
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35 ********************************************************************************
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36 */
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37 typedef struct {
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38 Word16 pbuf[5];
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39 Word16 past_gain_pit;
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40 Word16 prev_gp;
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41 } ec_gain_pitchState;
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42
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43 typedef struct {
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44 Word16 gbuf[5];
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45 Word16 past_gain_code;
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46 Word16 prev_gc;
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47 } ec_gain_codeState;
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48 /*
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49 ********************************************************************************
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50 * DECLARATION OF PROTOTYPES
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51 ********************************************************************************
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52 */
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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 * Function : ec_gain_code_reset
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58 * Purpose : Resets state memory
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59 *
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60 **************************************************************************
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61 */
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62 void ec_gain_code_reset (
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63 ec_gain_codeState *state
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64 );
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65
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66 /*
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67 **************************************************************************
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68 *
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69 * Function : ec_gain_code
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70 * Purpose : conceal the codebook gain
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71 * Call this function only in BFI (instead of normal gain
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72 * decoding function)
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73 *
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74 **************************************************************************
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75 */
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76 void ec_gain_code (
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77 ec_gain_codeState *st, /* i/o : State struct */
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78 gc_predState *pred_state, /* i/o : MA predictor state */
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79 Word16 state, /* i : state of the state machine */
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80 Word16 *gain_code /* o : decoded innovation gain */
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81 );
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82
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83 /*
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84 **************************************************************************
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85 *
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86 * Function : ec_gain_code_update
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87 * Purpose : update the codebook gain concealment state;
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88 * limit gain_code if the previous frame was bad
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89 * Call this function always after decoding (or concealing)
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90 * the gain
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91 *
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92 **************************************************************************
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93 */
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94 void ec_gain_code_update (
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95 ec_gain_codeState *st, /* i/o : State struct */
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96 Word16 bfi, /* i : flag: frame is bad */
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97 Word16 prev_bf, /* i : flag: previous frame was bad */
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98 Word16 *gain_code /* i/o : decoded innovation gain */
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99 );
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100
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101 /*
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102 **************************************************************************
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103 *
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104 * Function: ec_gain_pitch_reset
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105 * Purpose: Resets state memory
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106 *
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107 **************************************************************************
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108 */
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109 void ec_gain_pitch_reset (
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110 ec_gain_pitchState *state
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111 );
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112
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113 /*
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114 **************************************************************************
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115 *
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116 * Function : ec_gain_pitch
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117 * Purpose : conceal the pitch gain
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118 * Call this function only in BFI (instead of normal gain
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119 * decoding function)
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120 *
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121 **************************************************************************
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122 */
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123 void ec_gain_pitch (
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124 ec_gain_pitchState *st, /* i/o : state variables */
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125 Word16 state, /* i : state of the state machine */
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126 Word16 *gain_pitch /* o : pitch gain (Q14) */
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127 );
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128
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129 /*
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130 **************************************************************************
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131 *
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132 * Function : ec_gain_pitch_update
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133 * Purpose : update the pitch gain concealment state;
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134 * limit gain_pitch if the previous frame was bad
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135 * Call this function always after decoding (or concealing)
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136 * the gain
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137 *
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138 **************************************************************************
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139 */
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140 void ec_gain_pitch_update (
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141 ec_gain_pitchState *st, /* i/o : state variables */
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142 Word16 bfi, /* i : flag: frame is bad */
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143 Word16 prev_bf, /* i : flag: previous frame was bad */
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144 Word16 *gain_pitch /* i/o : pitch gain */
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145 );
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146
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147 #endif