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annotate libgsmefr/dec_12k2.c @ 53:49dd1ac8e75b

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libgsmefr: import most *.c files from ETSI source
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 25 Nov 2022 16:18:21 +0000
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children 1cc2968f883f
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53
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1 /***************************************************************************
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2 *
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3 * FILE NAME: dec_12k2.c
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4 *
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5 * FUNCTIONS DEFINED IN THIS FILE:
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6 * Init_Decoder_12k2 and Decoder_12k2
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7 *
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8 *
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9 * Init_Decoder_12k2():
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10 * Initialization of variables for the decoder section.
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11 *
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12 * Decoder_12k2():
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13 * Speech decoder routine operating on a frame basis.
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14 *
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15 ***************************************************************************/
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16
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17 #include "typedef.h"
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18 #include "basic_op.h"
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19 #include "sig_proc.h"
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20 #include "count.h"
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21 #include "codec.h"
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22 #include "cnst.h"
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23
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24 #include "dtx.h"
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25
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26 extern Word16 dtx_mode;
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27
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28 /*---------------------------------------------------------------*
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29 * Decoder constant parameters (defined in "cnst.h") *
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30 *---------------------------------------------------------------*
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31 * L_FRAME : Frame size. *
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32 * L_FRAME_BY2 : Half the frame size. *
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33 * L_SUBFR : Sub-frame size. *
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34 * M : LPC order. *
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35 * MP1 : LPC order+1 *
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36 * PIT_MIN : Minimum pitch lag. *
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37 * PIT_MAX : Maximum pitch lag. *
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38 * L_INTERPOL : Length of filter for interpolation *
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39 * PRM_SIZE : size of vector containing analysis parameters *
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40 *---------------------------------------------------------------*/
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41
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42 /*--------------------------------------------------------*
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43 * Static memory allocation. *
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44 *--------------------------------------------------------*/
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45
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46 /* Excitation vector */
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47
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48 static Word16 old_exc[L_FRAME + PIT_MAX + L_INTERPOL];
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49 static Word16 *exc;
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50
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51 /* Lsp (Line spectral pairs) */
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52
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53 static Word16 lsp_old[M];
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54
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55 /* Filter's memory */
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56
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57 static Word16 mem_syn[M];
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58
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59 /* Memories for bad frame handling */
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60
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61 static Word16 prev_bf;
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62 static Word16 state;
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63
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64 /***************************************************************************
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65 *
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66 * FUNCTION: Init_Decoder_12k2
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67 *
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68 * PURPOSE: Initialization of variables for the decoder section.
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69 *
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70 ***************************************************************************/
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71
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72 void Init_Decoder_12k2 (void)
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73 {
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74 /* Initialize static pointer */
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75
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76 exc = old_exc + PIT_MAX + L_INTERPOL;
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77
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78 /* Static vectors to zero */
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79
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80 Set_zero (old_exc, PIT_MAX + L_INTERPOL);
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81 Set_zero (mem_syn, M);
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82
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83 /* Initialize lsp_old [] */
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84
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85 lsp_old[0] = 30000;
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86 lsp_old[1] = 26000;
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87 lsp_old[2] = 21000;
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88 lsp_old[3] = 15000;
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89 lsp_old[4] = 8000;
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90 lsp_old[5] = 0;
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91 lsp_old[6] = -8000;
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92 lsp_old[7] = -15000;
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93 lsp_old[8] = -21000;
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94 lsp_old[9] = -26000;
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95
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96 /* Initialize memories of bad frame handling */
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97
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98 prev_bf = 0;
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99 state = 0;
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100
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101 return;
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102 }
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103
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104 /***************************************************************************
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105 *
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106 * FUNCTION: Decoder_12k2
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107 *
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108 * PURPOSE: Speech decoder routine.
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109 *
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110 ***************************************************************************/
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111
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112 void Decoder_12k2 (
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113 Word16 parm[], /* input : vector of synthesis parameters
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114 parm[0] = bad frame indicator (bfi) */
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115 Word16 synth[],/* output: synthesis speech */
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116 Word16 A_t[], /* output: decoded LP filter in 4 subframes */
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117 Word16 TAF,
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118 Word16 SID_flag
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119 )
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120 {
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121
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122 /* LPC coefficients */
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123
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124 Word16 *Az; /* Pointer on A_t */
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125
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126 /* LSPs */
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127
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128 Word16 lsp_new[M];
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129 Word16 lsp_mid[M];
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130
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131 /* Algebraic codevector */
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132
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133 Word16 code[L_SUBFR];
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134
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135 /* excitation */
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136
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137 Word16 excp[L_SUBFR];
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138
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139 /* Scalars */
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140
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141 Word16 i, i_subfr;
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142 Word16 T0, T0_frac, index;
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143 Word16 gain_pit, gain_code, bfi, pit_sharp;
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144 Word16 temp;
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145 Word32 L_temp;
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146
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147 extern Word16 rxdtx_ctrl, rx_dtx_state;
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148 extern Word32 L_pn_seed_rx;
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149
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150 /* Test bad frame indicator (bfi) */
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151
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152 bfi = *parm++; move16 ();
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153
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154 /* Set state machine */
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155
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156 test (); test ();
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157 if (bfi != 0)
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158 {
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159 state = add (state, 1);
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160 }
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161 else if (sub (state, 6) == 0)
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162 {
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163 state = 5;
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164 }
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165 else
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166 {
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167 state = 0;
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168 }
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169
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170 test ();
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171 if (sub (state, 6) > 0)
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172 {
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173 state = 6;
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174 }
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175 rx_dtx (&rxdtx_ctrl, TAF, bfi, SID_flag);
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176
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177 /* If this frame is the first speech frame after CNI period, */
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178 /* set the BFH state machine to an appropriate state depending */
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179 /* on whether there was DTX muting before start of speech or not */
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180 /* If there was DTX muting, the first speech frame is muted. */
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181 /* If there was no DTX muting, the first speech frame is not */
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182 /* muted. The BFH state machine starts from state 5, however, to */
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183 /* keep the audible noise resulting from a SID frame which is */
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184 /* erroneously interpreted as a good speech frame as small as */
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185 /* possible (the decoder output in this case is quickly muted) */
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186 test (); logic16 ();
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187 if ((rxdtx_ctrl & RX_FIRST_SP_FLAG) != 0)
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188 {
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189 test (); logic16 ();
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190 if ((rxdtx_ctrl & RX_PREV_DTX_MUTING) != 0)
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191 {
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192 state = 5; move16 ();
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193 prev_bf = 1; move16 ();
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194 }
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195 else
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196 {
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197 state = 5; move16 ();
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198 prev_bf = 0; move16 ();
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199 }
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200 }
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201
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202 #if (WMOPS)
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203 fwc (); /* function worst case */
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204
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205 /* Note! The following test is performed only for determining
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206 whether or not DTX mode is active, in order to switch off
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207 worst worst case complexity printout when DTX mode is active
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208 */
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209 if ((rxdtx_ctrl & RX_SP_FLAG) == 0)
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210 {
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211 dtx_mode = 1;
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212 }
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213 #endif
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214
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Mychaela Falconia <falcon@freecalypso.org>
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215 D_plsf_5 (parm, lsp_mid, lsp_new, bfi, rxdtx_ctrl, rx_dtx_state);
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216
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217 #if (WMOPS)
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218 fwc (); /* function worst case */
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diff changeset
219 #endif
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220 /* Advance synthesis parameters pointer */
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221 parm += 5; move16 ();
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diff changeset
222
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223 test (); logic16 ();
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224 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
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225 {
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226 /* Interpolation of LPC for the 4 subframes */
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diff changeset
227
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Mychaela Falconia <falcon@freecalypso.org>
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228 Int_lpc (lsp_old, lsp_mid, lsp_new, A_t);
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229 }
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230 else
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diff changeset
231 {
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232 /* Comfort noise: use the same parameters in each subframe */
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233 Lsp_Az (lsp_new, A_t);
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234
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235 for (i = 0; i < MP1; i++)
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236 {
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237 A_t[i + MP1] = A_t[i]; move16 ();
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238 A_t[i + 2 * MP1] = A_t[i]; move16 ();
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239 A_t[i + 3 * MP1] = A_t[i]; move16 ();
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240 }
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
241 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
242
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
243 /* update the LSPs for the next frame */
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diff changeset
244 for (i = 0; i < M; i++)
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diff changeset
245 {
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246 lsp_old[i] = lsp_new[i]; move16 ();
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diff changeset
247 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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diff changeset
248 #if (WMOPS)
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Mychaela Falconia <falcon@freecalypso.org>
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249 fwc (); /* function worst case */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
250 #endif
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
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251
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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252 /*---------------------------------------------------------------------*
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Mychaela Falconia <falcon@freecalypso.org>
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253 * Loop for every subframe in the analysis frame *
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254 *---------------------------------------------------------------------*
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255 * The subframe size is L_SUBFR and the loop is repeated *
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256 * L_FRAME/L_SUBFR times *
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257 * - decode the pitch delay *
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258 * - decode algebraic code *
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259 * - decode pitch and codebook gains *
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260 * - find the excitation and compute synthesis speech *
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261 *---------------------------------------------------------------------*/
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262
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263 /* pointer to interpolated LPC parameters */
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264 Az = A_t; move16 ();
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265
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266 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR)
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267 {
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268
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269 index = *parm++; move16 (); /* pitch index */
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270
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271 test (); logic16 ();
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272 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
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273 {
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274 T0 = Dec_lag6 (index, PIT_MIN, PIT_MAX, i_subfr, L_FRAME_BY2,
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275 &T0_frac, bfi);
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276 #if (WMOPS)
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277 fwc (); /* function worst case */
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278 #endif
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279
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280 /*-------------------------------------------------*
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281 * - Find the adaptive codebook vector. *
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282 *-------------------------------------------------*/
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283
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284 Pred_lt_6 (&exc[i_subfr], T0, T0_frac, L_SUBFR);
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285 #if (WMOPS)
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286 fwc (); /* function worst case */
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parents:
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287 #endif
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288 }
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289 else
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290 {
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291 T0 = L_SUBFR; move16 ();
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292 }
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293
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294 /*-------------------------------------------------------*
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295 * - Decode pitch gain. *
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296 *-------------------------------------------------------*/
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297
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298 index = *parm++; move16 ();
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299
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300 gain_pit = d_gain_pitch (index, bfi, state, prev_bf, rxdtx_ctrl);
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301 move16 ();
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302 #if (WMOPS)
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303 fwc (); /* function worst case */
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Mychaela Falconia <falcon@freecalypso.org>
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304 #endif
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305
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306 /*-------------------------------------------------------*
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307 * - Decode innovative codebook. *
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308 *-------------------------------------------------------*/
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309
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310 test (); logic16 ();
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311 if ((rxdtx_ctrl & RX_SP_FLAG) != 0)
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312 {
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313 dec_10i40_35bits (parm, code);
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314 }
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315 else
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316 { /* Use pseudo noise for excitation when SP_flag == 0 */
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317 build_CN_code (code, &L_pn_seed_rx);
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318 }
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319
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320 parm += 10; move16 ();
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321 #if (WMOPS)
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322 fwc (); /* function worst case */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
323 #endif
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324
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325 /*-------------------------------------------------------*
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326 * - Add the pitch contribution to code[]. *
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327 *-------------------------------------------------------*/
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328
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329 /* pit_sharp = gain_pit; */
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330 /* if (pit_sharp > 1.0) pit_sharp = 1.0; */
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diff changeset
331
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332 pit_sharp = shl (gain_pit, 3);
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diff changeset
333
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diff changeset
334 /* This loop is not entered when SP_FLAG is 0 */
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parents:
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335 for (i = T0; i < L_SUBFR; i++)
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diff changeset
336 {
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337 temp = mult (code[i - T0], pit_sharp);
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parents:
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338 code[i] = add (code[i], temp);
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339 move16 ();
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340 }
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Mychaela Falconia <falcon@freecalypso.org>
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341 #if (WMOPS)
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342 fwc (); /* function worst case */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
343 #endif
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Mychaela Falconia <falcon@freecalypso.org>
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344 /* post processing of excitation elements */
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diff changeset
345
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346 test (); /* This test is not passed when SP_FLAG is 0 */
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parents:
diff changeset
347 if (sub (pit_sharp, 16384) > 0)
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diff changeset
348 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
349 for (i = 0; i < L_SUBFR; i++)
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
350 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
351 temp = mult (exc[i + i_subfr], pit_sharp);
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352 L_temp = L_mult (temp, gain_pit);
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353 L_temp = L_shl (L_temp, 1);
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354 excp[i] = round (L_temp);
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diff changeset
355 move16 ();
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parents:
diff changeset
356 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
357 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
358 /*-------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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359 * - Decode codebook gain. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
360 *-------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
361
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
362 index = *parm++; move16 (); /* index of energy VQ */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
363
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
364 d_gain_code (index, code, L_SUBFR, &gain_code, bfi, state, prev_bf,
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
365 rxdtx_ctrl, i_subfr, rx_dtx_state);
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diff changeset
366 #if (WMOPS)
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Mychaela Falconia <falcon@freecalypso.org>
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367 fwc (); /* function worst case */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
368 #endif
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
369
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
370 /*-------------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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371 * - Find the total excitation. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
372 * - Find synthesis speech corresponding to exc[]. *
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
373 *-------------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
374 for (i = 0; i < L_SUBFR; i++)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
375 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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376 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */
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Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
377
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
378 L_temp = L_mult (exc[i + i_subfr], gain_pit);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
379 L_temp = L_mac (L_temp, code[i], gain_code);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
380 L_temp = L_shl (L_temp, 3);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
381
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
382 exc[i + i_subfr] = round (L_temp);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
383 move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
384 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
385 #if (WMOPS)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
386 fwc (); /* function worst case */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
387 #endif
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
388
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
389 test ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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390 if (sub (pit_sharp, 16384) > 0)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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391 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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392 for (i = 0; i < L_SUBFR; i++)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
393 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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394 excp[i] = add (excp[i], exc[i + i_subfr]);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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395 move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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396 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
397 agc2 (&exc[i_subfr], excp, L_SUBFR);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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398 Syn_filt (Az, excp, &synth[i_subfr], L_SUBFR, mem_syn, 1);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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399 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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400 else
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
401 {
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
402 Syn_filt (Az, &exc[i_subfr], &synth[i_subfr], L_SUBFR, mem_syn, 1);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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403 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
404
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
405 #if (WMOPS)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
406 fwc (); /* function worst case */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
407 #endif
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
408 /* interpolated LPC parameters for next subframe */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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409 Az += MP1; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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410 }
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
411
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
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412 /*--------------------------------------------------*
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
413 * Update signal for next frame. *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
414 * -> shift to the left by L_FRAME exc[] *
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
415 *--------------------------------------------------*/
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
416
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
417 Copy (&old_exc[L_FRAME], &old_exc[0], PIT_MAX + L_INTERPOL);
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
418 #if (WMOPS)
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
419 fwc (); /* function worst case */
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
420 #endif
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
421 prev_bf = bfi; move16 ();
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
422
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
423 return;
49dd1ac8e75b libgsmefr: import most *.c files from ETSI source
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
424 }