FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/dec_12k2.c @ 64:1cc2968f883f
libgsmefr: dec_12k2.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 02:05:51 +0000 |
parents | 49dd1ac8e75b |
children | cb080ec1817e |
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 "gsm_efr.h" |
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18 #include "typedef.h" |
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19 #include "namespace.h" |
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20 #include "basic_op.h" |
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21 #include "sig_proc.h" |
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22 #include "memops.h" |
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23 #include "no_count.h" |
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24 #include "codec.h" |
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25 #include "cnst.h" |
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26 #include "dec_state.h" |
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27 |
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28 #include "dtx.h" |
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29 |
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30 /*---------------------------------------------------------------* |
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31 * Decoder constant parameters (defined in "cnst.h") * |
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32 *---------------------------------------------------------------* |
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33 * L_FRAME : Frame size. * |
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34 * L_FRAME_BY2 : Half the frame size. * |
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35 * L_SUBFR : Sub-frame size. * |
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36 * M : LPC order. * |
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37 * MP1 : LPC order+1 * |
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38 * PIT_MIN : Minimum pitch lag. * |
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39 * PIT_MAX : Maximum pitch lag. * |
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40 * L_INTERPOL : Length of filter for interpolation * |
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41 * PRM_SIZE : size of vector containing analysis parameters * |
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42 *---------------------------------------------------------------*/ |
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43 |
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44 /*--------------------------------------------------------* |
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45 * Static memory allocation. * |
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46 *--------------------------------------------------------*/ |
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47 |
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48 /*************************************************************************** |
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49 * |
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50 * FUNCTION: Init_Decoder_12k2 |
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51 * |
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52 * PURPOSE: Initialization of variables for the decoder section. |
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53 * |
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54 ***************************************************************************/ |
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55 |
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56 void Init_Decoder_12k2 (struct EFR_decoder_state *st) |
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57 { |
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58 /* Static vectors to zero */ |
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59 |
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60 Set_zero (st->old_exc, PIT_MAX + L_INTERPOL); |
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61 Set_zero (st->mem_syn, M); |
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62 |
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63 /* Initialize lsp_old [] */ |
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64 |
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65 st->lsp_old[0] = 30000; |
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66 st->lsp_old[1] = 26000; |
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67 st->lsp_old[2] = 21000; |
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68 st->lsp_old[3] = 15000; |
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69 st->lsp_old[4] = 8000; |
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70 st->lsp_old[5] = 0; |
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71 st->lsp_old[6] = -8000; |
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72 st->lsp_old[7] = -15000; |
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73 st->lsp_old[8] = -21000; |
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74 st->lsp_old[9] = -26000; |
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75 |
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76 /* Initialize memories of bad frame handling */ |
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77 |
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78 st->prev_bf = 0; |
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79 st->bf_state = 0; |
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80 |
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81 return; |
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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: Decoder_12k2 |
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87 * |
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88 * PURPOSE: Speech decoder routine. |
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89 * |
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90 ***************************************************************************/ |
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91 |
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92 void Decoder_12k2 ( |
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93 struct EFR_decoder_state *st, |
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94 Word16 bfi, /* input : Bad Frame Indication */ |
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95 Word16 parm[], /* input : vector of synthesis parameters */ |
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96 Word16 synth[],/* output: synthesis speech */ |
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97 Word16 A_t[], /* output: decoded LP filter in 4 subframes */ |
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98 Word16 TAF, |
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99 Word16 SID_flag |
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100 ) |
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101 { |
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102 Word16 *exc = st->old_exc + PIT_MAX + L_INTERPOL; |
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103 |
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104 /* LPC coefficients */ |
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105 |
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106 Word16 *Az; /* Pointer on A_t */ |
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107 |
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108 /* LSPs */ |
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109 |
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110 Word16 lsp_new[M]; |
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111 Word16 lsp_mid[M]; |
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112 |
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113 /* Algebraic codevector */ |
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114 |
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115 Word16 code[L_SUBFR]; |
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116 |
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117 /* excitation */ |
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118 |
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119 Word16 excp[L_SUBFR]; |
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120 |
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121 /* Scalars */ |
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122 |
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123 Word16 i, i_subfr; |
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124 Word16 T0, T0_frac, index; |
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125 Word16 gain_pit, gain_code, pit_sharp; |
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126 Word16 temp; |
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127 Word32 L_temp; |
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128 |
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129 /* Set state machine */ |
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130 |
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131 if (bfi != 0) |
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132 { |
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133 st->bf_state = add (st->bf_state, 1); |
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134 } |
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135 else if (sub (st->bf_state, 6) == 0) |
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136 { |
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137 st->bf_state = 5; |
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138 } |
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139 else |
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140 { |
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141 st->bf_state = 0; |
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142 } |
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143 |
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144 if (sub (st->bf_state, 6) > 0) |
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145 { |
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146 st->bf_state = 6; |
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147 } |
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148 rx_dtx (st, TAF, bfi, SID_flag); |
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149 |
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150 /* If this frame is the first speech frame after CNI period, */ |
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151 /* set the BFH state machine to an appropriate state depending */ |
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152 /* on whether there was DTX muting before start of speech or not */ |
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153 /* If there was DTX muting, the first speech frame is muted. */ |
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154 /* If there was no DTX muting, the first speech frame is not */ |
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155 /* muted. The BFH state machine starts from state 5, however, to */ |
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156 /* keep the audible noise resulting from a SID frame which is */ |
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157 /* erroneously interpreted as a good speech frame as small as */ |
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158 /* possible (the decoder output in this case is quickly muted) */ |
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159 if ((st->rxdtx_ctrl & RX_FIRST_SP_FLAG) != 0) |
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160 { |
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161 if ((st->rxdtx_ctrl & RX_PREV_DTX_MUTING) != 0) |
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162 { |
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163 st->bf_state = 5; |
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164 st->prev_bf = 1; |
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165 } |
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166 else |
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167 { |
64
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168 st->bf_state = 5; |
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169 st->prev_bf = 0; |
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170 } |
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171 } |
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172 |
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173 D_plsf_5 (st, parm, lsp_mid, lsp_new, bfi, st->rxdtx_ctrl, |
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174 st->rx_dtx_state); |
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175 |
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176 /* Advance synthesis parameters pointer */ |
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177 parm += 5; move16 (); |
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178 |
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179 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0) |
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180 { |
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181 /* Interpolation of LPC for the 4 subframes */ |
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182 |
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183 Int_lpc (st->lsp_old, lsp_mid, lsp_new, A_t); |
53
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184 } |
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185 else |
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186 { |
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187 /* Comfort noise: use the same parameters in each subframe */ |
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188 Lsp_Az (lsp_new, A_t); |
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189 |
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190 for (i = 0; i < MP1; i++) |
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191 { |
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192 A_t[i + MP1] = A_t[i]; move16 (); |
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193 A_t[i + 2 * MP1] = A_t[i]; move16 (); |
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194 A_t[i + 3 * MP1] = A_t[i]; move16 (); |
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195 } |
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196 } |
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197 |
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198 /* update the LSPs for the next frame */ |
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199 for (i = 0; i < M; i++) |
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200 { |
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201 st->lsp_old[i] = lsp_new[i]; |
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202 } |
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203 |
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204 /*---------------------------------------------------------------------* |
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205 * Loop for every subframe in the analysis frame * |
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206 *---------------------------------------------------------------------* |
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207 * The subframe size is L_SUBFR and the loop is repeated * |
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208 * L_FRAME/L_SUBFR times * |
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209 * - decode the pitch delay * |
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210 * - decode algebraic code * |
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211 * - decode pitch and codebook gains * |
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212 * - find the excitation and compute synthesis speech * |
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213 *---------------------------------------------------------------------*/ |
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214 |
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215 /* pointer to interpolated LPC parameters */ |
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216 Az = A_t; move16 (); |
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217 |
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218 for (i_subfr = 0; i_subfr < L_FRAME; i_subfr += L_SUBFR) |
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219 { |
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220 |
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221 index = *parm++; move16 (); /* pitch index */ |
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222 |
64
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223 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0) |
53
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224 { |
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225 T0 = Dec_lag6 (st, index, PIT_MIN, PIT_MAX, i_subfr, L_FRAME_BY2, |
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226 &T0_frac, bfi); |
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227 |
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228 /*-------------------------------------------------* |
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229 * - Find the adaptive codebook vector. * |
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230 *-------------------------------------------------*/ |
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231 |
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232 Pred_lt_6 (&exc[i_subfr], T0, T0_frac, L_SUBFR); |
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233 } |
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234 else |
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235 { |
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236 T0 = L_SUBFR; move16 (); |
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237 } |
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238 |
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239 /*-------------------------------------------------------* |
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240 * - Decode pitch gain. * |
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241 *-------------------------------------------------------*/ |
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242 |
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243 index = *parm++; move16 (); |
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244 |
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245 gain_pit = d_gain_pitch (st, index, bfi, st->bf_state, st->prev_bf, |
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246 st->rxdtx_ctrl); |
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247 |
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248 /*-------------------------------------------------------* |
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249 * - Decode innovative codebook. * |
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250 *-------------------------------------------------------*/ |
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251 |
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252 if ((st->rxdtx_ctrl & RX_SP_FLAG) != 0) |
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253 { |
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254 dec_10i40_35bits (parm, code); |
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255 } |
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256 else |
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257 { /* Use pseudo noise for excitation when SP_flag == 0 */ |
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258 build_CN_code (code, &st->L_pn_seed_rx); |
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259 } |
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260 |
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261 parm += 10; move16 (); |
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262 |
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263 /*-------------------------------------------------------* |
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264 * - Add the pitch contribution to code[]. * |
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265 *-------------------------------------------------------*/ |
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266 |
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267 /* pit_sharp = gain_pit; */ |
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268 /* if (pit_sharp > 1.0) pit_sharp = 1.0; */ |
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269 |
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270 pit_sharp = shl (gain_pit, 3); |
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271 |
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272 /* This loop is not entered when SP_FLAG is 0 */ |
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273 for (i = T0; i < L_SUBFR; i++) |
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274 { |
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275 temp = mult (code[i - T0], pit_sharp); |
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276 code[i] = add (code[i], temp); |
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277 move16 (); |
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278 } |
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279 |
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280 /* post processing of excitation elements */ |
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281 |
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282 test (); /* This test is not passed when SP_FLAG is 0 */ |
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283 if (sub (pit_sharp, 16384) > 0) |
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284 { |
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285 for (i = 0; i < L_SUBFR; i++) |
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286 { |
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287 temp = mult (exc[i + i_subfr], pit_sharp); |
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288 L_temp = L_mult (temp, gain_pit); |
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289 L_temp = L_shl (L_temp, 1); |
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290 excp[i] = round (L_temp); |
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291 move16 (); |
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292 } |
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293 } |
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294 /*-------------------------------------------------* |
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295 * - Decode codebook gain. * |
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296 *-------------------------------------------------*/ |
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297 |
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298 index = *parm++; move16 (); /* index of energy VQ */ |
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299 |
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300 d_gain_code (st, index, code, L_SUBFR, &gain_code, bfi, st->bf_state, |
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301 st->prev_bf, st->rxdtx_ctrl, i_subfr, st->rx_dtx_state); |
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302 |
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303 /*-------------------------------------------------------* |
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304 * - Find the total excitation. * |
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305 * - Find synthesis speech corresponding to exc[]. * |
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306 *-------------------------------------------------------*/ |
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307 for (i = 0; i < L_SUBFR; i++) |
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308 { |
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309 /* exc[i] = gain_pit*exc[i] + gain_code*code[i]; */ |
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310 |
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311 L_temp = L_mult (exc[i + i_subfr], gain_pit); |
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312 L_temp = L_mac (L_temp, code[i], gain_code); |
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313 L_temp = L_shl (L_temp, 3); |
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314 |
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315 exc[i + i_subfr] = round (L_temp); |
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316 move16 (); |
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317 } |
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318 |
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319 if (sub (pit_sharp, 16384) > 0) |
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320 { |
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321 for (i = 0; i < L_SUBFR; i++) |
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322 { |
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323 excp[i] = add (excp[i], exc[i + i_subfr]); |
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324 } |
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325 agc2 (&exc[i_subfr], excp, L_SUBFR); |
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326 Syn_filt (Az, excp, &synth[i_subfr], L_SUBFR, st->mem_syn, 1); |
53
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327 } |
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328 else |
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329 { |
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330 Syn_filt (Az, &exc[i_subfr], &synth[i_subfr], L_SUBFR, |
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331 st->mem_syn, 1); |
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332 } |
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333 |
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334 /* interpolated LPC parameters for next subframe */ |
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335 Az += MP1; move16 (); |
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336 } |
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337 |
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338 /*--------------------------------------------------* |
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339 * Update signal for next frame. * |
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340 * -> shift to the left by L_FRAME exc[] * |
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341 *--------------------------------------------------*/ |
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342 |
64
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343 Copy (&st->old_exc[L_FRAME], &st->old_exc[0], PIT_MAX + L_INTERPOL); |
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344 st->prev_bf = bfi; |
53
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345 |
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346 return; |
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347 } |