FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/dec_12k2.c @ 62:c87ccddf3fd1
libgsmefr: d_homing.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 00:53:14 +0000 |
parents | 49dd1ac8e75b |
children | 1cc2968f883f |
rev | line source |
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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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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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219 #endif |
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220 /* Advance synthesis parameters pointer */ |
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221 parm += 5; move16 (); |
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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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227 |
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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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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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241 } |
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242 |
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243 /* update the LSPs for the next frame */ |
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244 for (i = 0; i < M; i++) |
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245 { |
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246 lsp_old[i] = lsp_new[i]; move16 (); |
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247 } |
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248 #if (WMOPS) |
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249 fwc (); /* function worst case */ |
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250 #endif |
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251 |
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252 /*---------------------------------------------------------------------* |
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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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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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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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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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331 |
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332 pit_sharp = shl (gain_pit, 3); |
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333 |
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334 /* This loop is not entered when SP_FLAG is 0 */ |
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335 for (i = T0; i < L_SUBFR; i++) |
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336 { |
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337 temp = mult (code[i - T0], pit_sharp); |
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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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341 #if (WMOPS) |
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342 fwc (); /* function worst case */ |
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343 #endif |
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344 /* post processing of excitation elements */ |
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345 |
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346 test (); /* This test is not passed when SP_FLAG is 0 */ |
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347 if (sub (pit_sharp, 16384) > 0) |
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348 { |
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349 for (i = 0; i < L_SUBFR; i++) |
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350 { |
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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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355 move16 (); |
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356 } |
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357 } |
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358 /*-------------------------------------------------* |
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359 * - Decode codebook gain. * |
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360 *-------------------------------------------------*/ |
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361 |
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362 index = *parm++; move16 (); /* index of energy VQ */ |
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363 |
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364 d_gain_code (index, code, L_SUBFR, &gain_code, bfi, state, prev_bf, |
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365 rxdtx_ctrl, i_subfr, rx_dtx_state); |
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366 #if (WMOPS) |
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367 fwc (); /* function worst case */ |
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368 #endif |
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369 |
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370 /*-------------------------------------------------------* |
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371 * - Find the total excitation. * |
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372 * - Find synthesis speech corresponding to exc[]. * |
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373 *-------------------------------------------------------*/ |
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374 for (i = 0; i < L_SUBFR; i++) |
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375 { |
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376 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */ |
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377 |
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378 L_temp = L_mult (exc[i + i_subfr], gain_pit); |
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379 L_temp = L_mac (L_temp, code[i], gain_code); |
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380 L_temp = L_shl (L_temp, 3); |
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381 |
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382 exc[i + i_subfr] = round (L_temp); |
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383 move16 (); |
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384 } |
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385 #if (WMOPS) |
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386 fwc (); /* function worst case */ |
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387 #endif |
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388 |
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389 test (); |
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390 if (sub (pit_sharp, 16384) > 0) |
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391 { |
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392 for (i = 0; i < L_SUBFR; i++) |
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393 { |
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394 excp[i] = add (excp[i], exc[i + i_subfr]); |
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395 move16 (); |
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396 } |
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397 agc2 (&exc[i_subfr], excp, L_SUBFR); |
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398 Syn_filt (Az, excp, &synth[i_subfr], L_SUBFR, mem_syn, 1); |
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399 } |
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400 else |
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401 { |
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402 Syn_filt (Az, &exc[i_subfr], &synth[i_subfr], L_SUBFR, mem_syn, 1); |
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403 } |
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404 |
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405 #if (WMOPS) |
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406 fwc (); /* function worst case */ |
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407 #endif |
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408 /* interpolated LPC parameters for next subframe */ |
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409 Az += MP1; move16 (); |
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410 } |
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411 |
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412 /*--------------------------------------------------* |
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413 * Update signal for next frame. * |
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414 * -> shift to the left by L_FRAME exc[] * |
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415 *--------------------------------------------------*/ |
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416 |
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417 Copy (&old_exc[L_FRAME], &old_exc[0], PIT_MAX + L_INTERPOL); |
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418 #if (WMOPS) |
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419 fwc (); /* function worst case */ |
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420 #endif |
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421 prev_bf = bfi; move16 (); |
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422 |
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423 return; |
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424 } |