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annotate libgsmfr2/ed_internal.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 8b21a6b7a3bf
children
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8b21a6b7a3bf libgsmfr2: beginning to integrate TU-Berlin code guts
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1 /*
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2 * This header file has been adapted from inc/private.h
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3 * in TU-Berlin libgsm source, original notice follows:
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4 *
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5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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8 */
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9
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10 #define SASR(x, by) ((x) >> (by))
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12 /*
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13 * Prototypes from add.c
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14 */
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15 extern word gsm_mult (word a, word b);
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16 extern longword gsm_L_mult (word a, word b);
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17 extern word gsm_mult_r (word a, word b);
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19 extern word gsm_div (word num, word denum);
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21 extern word gsm_add ( word a, word b );
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22 extern longword gsm_L_add ( longword a, longword b );
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24 extern word gsm_sub (word a, word b);
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25 extern longword gsm_L_sub (longword a, longword b);
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27 extern word gsm_abs (word a);
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29 extern word gsm_norm ( longword a );
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31 extern longword gsm_L_asl (longword a, int n);
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32 extern word gsm_asl (word a, int n);
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34 extern longword gsm_L_asr (longword a, int n);
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35 extern word gsm_asr (word a, int n);
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37 /*
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38 * Inlined functions from add.h
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39 */
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41 /*
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42 * #define GSM_MULT_R(a, b) (* word a, word b, !(a == b == MIN_WORD) *) \
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43 * (0x0FFFF & SASR(((longword)(a) * (longword)(b) + 16384), 15))
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44 */
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45 #define GSM_MULT_R(a, b) /* word a, word b, !(a == b == MIN_WORD) */ \
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46 (SASR( ((longword)(a) * (longword)(b) + 16384), 15 ))
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48 # define GSM_MULT(a,b) /* word a, word b, !(a == b == MIN_WORD) */ \
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49 (SASR( ((longword)(a) * (longword)(b)), 15 ))
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51 # define GSM_L_MULT(a, b) /* word a, word b */ \
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52 (((longword)(a) * (longword)(b)) << 1)
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53
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54 # define GSM_L_ADD(a, b) \
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55 ( (a) < 0 ? ( (b) >= 0 ? (a) + (b) \
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56 : (utmp = (ulongword)-((a) + 1) + (ulongword)-((b) + 1)) \
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57 >= MAX_LONGWORD ? MIN_LONGWORD : -(longword)utmp-2 ) \
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58 : ((b) <= 0 ? (a) + (b) \
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59 : (utmp = (ulongword)(a) + (ulongword)(b)) >= MAX_LONGWORD \
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60 ? MAX_LONGWORD : utmp))
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61
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62 /*
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63 * # define GSM_ADD(a, b) \
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64 * ((ltmp = (longword)(a) + (longword)(b)) >= MAX_WORD \
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65 * ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
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66 */
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67 /* Nonportable, but faster: */
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68
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69 #define GSM_ADD(a, b) \
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70 ((ulongword)((ltmp = (longword)(a) + (longword)(b)) - MIN_WORD) > \
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71 MAX_WORD - MIN_WORD ? (ltmp > 0 ? MAX_WORD : MIN_WORD) : ltmp)
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72
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73 # define GSM_SUB(a, b) \
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74 ((ltmp = (longword)(a) - (longword)(b)) >= MAX_WORD \
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75 ? MAX_WORD : ltmp <= MIN_WORD ? MIN_WORD : ltmp)
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76
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77 # define GSM_ABS(a) ((a) < 0 ? ((a) == MIN_WORD ? MAX_WORD : -(a)) : (a))
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78
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79 /* Use these if necessary:
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80
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81 # define GSM_MULT_R(a, b) gsm_mult_r(a, b)
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82 # define GSM_MULT(a, b) gsm_mult(a, b)
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83 # define GSM_L_MULT(a, b) gsm_L_mult(a, b)
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84
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85 # define GSM_L_ADD(a, b) gsm_L_add(a, b)
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86 # define GSM_ADD(a, b) gsm_add(a, b)
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87 # define GSM_SUB(a, b) gsm_sub(a, b)
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88
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89 # define GSM_ABS(a) gsm_abs(a)
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90
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91 */
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92
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93 /*
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94 * More prototypes from implementations..
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95 */
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96
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97 void Gsm_Long_Term_Predictor ( /* 4x for 160 samples */
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98 struct gsmfr_0610_state * S,
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99 word * d, /* [0..39] residual signal IN */
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100 word * dp, /* [-120..-1] d' IN */
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101 word * e, /* [0..40] OUT */
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102 word * dpp, /* [0..40] OUT */
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103 word * Nc, /* correlation lag OUT */
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104 word * bc /* gain factor OUT */);
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105
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106 void Gsm_LPC_Analysis (
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107 struct gsmfr_0610_state * S,
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108 word * s, /* 0..159 signals IN/OUT */
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109 word * LARc); /* 0..7 LARc's OUT */
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110
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111 void Gsm_Preprocess (
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112 struct gsmfr_0610_state * S,
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113 const word * s, word * so);
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114
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115 void Gsm_Encoding (
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116 struct gsmfr_0610_state * S,
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117 word * e,
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118 word * ep,
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119 word * xmaxc,
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120 word * Mc,
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121 word * xMc);
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122
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123 void Gsm_Short_Term_Analysis_Filter (
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124 struct gsmfr_0610_state * S,
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125 const word * LARc, /* coded log area ratio [0..7] IN */
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126 word * d /* st res. signal [0..159] IN/OUT */);
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127
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128 void Gsm_Decoding (
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129 struct gsmfr_0610_state * S,
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130 word xmaxcr,
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131 word Mcr,
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132 const word * xMcr, /* [0..12] IN */
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133 word * erp); /* [0..39] OUT */
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134
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135 void Gsm_Long_Term_Synthesis_Filtering (
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136 struct gsmfr_0610_state* S,
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137 word Ncr,
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138 word bcr,
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139 word * erp, /* [0..39] IN */
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140 word * drp); /* [-120..-1] IN, [0..40] OUT */
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141
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142 void Gsm_RPE_Decoding (
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143 struct gsmfr_0610_state *S,
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144 word xmaxcr,
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145 word Mcr,
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146 const word * xMcr, /* [0..12], 3 bits IN */
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147 word * erp); /* [0..39] OUT */
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148
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149 void Gsm_RPE_Encoding (
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150 struct gsmfr_0610_state * S,
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151 word * e, /* -5..-1][0..39][40..44 IN/OUT */
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152 word * xmaxc, /* OUT */
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153 word * Mc, /* OUT */
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154 word * xMc); /* [0..12] OUT */
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155
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156 void Gsm_Short_Term_Synthesis_Filter (
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157 struct gsmfr_0610_state * S,
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158 const word * LARcr, /* log area ratios [0..7] IN */
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159 word * drp, /* received d [0...39] IN */
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160 word * s); /* signal s [0..159] OUT */
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161
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162 void Gsm_Update_of_reconstructed_short_time_residual_signal (
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163 word * dpp, /* [0...39] IN */
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164 word * ep, /* [0...39] IN */
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165 word * dp); /* [-120...-1] IN/OUT */
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166
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167 /*
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168 * Tables from table.c
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169 */
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170
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171 extern word gsm_A[8], gsm_B[8], gsm_MIC[8], gsm_MAC[8];
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172 extern word gsm_INVA[8];
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173 extern word gsm_DLB[4], gsm_QLB[4];
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174 extern word gsm_H[11];
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175 extern word gsm_NRFAC[8];
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176 extern word gsm_FAC[8];