FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/d_plsf_5.c @ 55:92dc7f0082a3
libgsmefr: autocorr.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 25 Nov 2022 16:38:54 +0000 |
parents | 49dd1ac8e75b |
children | 6a623cb57d07 |
rev | line source |
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1 /************************************************************************* |
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2 * |
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3 * FUNCTION: D_plsf_5() |
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4 * |
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5 * PURPOSE: Decodes the 2 sets of LSP parameters in a frame using the |
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6 * received quantization indices. |
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7 * |
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8 * DESCRIPTION: |
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9 * The two sets of LSFs are quantized using split by 5 matrix |
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10 * quantization (split-MQ) with 1st order MA prediction. |
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11 * |
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12 * See "q_plsf_5.c" for more details about the quantization procedure |
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13 * |
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14 *************************************************************************/ |
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15 |
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16 #include "typedef.h" |
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17 #include "basic_op.h" |
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18 #include "count.h" |
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19 #include "sig_proc.h" |
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20 |
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21 #include "q_plsf_5.tab" /* Codebooks of LSF prediction residual */ |
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22 |
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23 #include "cnst.h" |
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24 #include "dtx.h" |
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25 |
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26 /* M ->order of linear prediction filter */ |
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27 /* LSF_GAP -> Minimum distance between LSF after quantization */ |
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28 /* 50 Hz = 205 */ |
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29 /* PRED_FAC -> Prediction factor = 0.65 */ |
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30 /* ALPHA -> 0.9 */ |
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31 /* ONE_ALPHA-> (1.0-ALPHA) */ |
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32 |
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33 #define M 10 |
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34 #define LSF_GAP 205 |
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35 #define PRED_FAC 21299 |
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36 #define ALPHA 31128 |
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37 #define ONE_ALPHA 1639 |
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38 |
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39 /* Past quantized prediction error */ |
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40 |
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41 Word16 past_r2_q[M]; |
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42 |
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43 /* Past dequantized lsfs */ |
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44 |
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45 Word16 past_lsf_q[M]; |
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46 |
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47 /* Reference LSF parameter vector (comfort noise) */ |
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48 |
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49 Word16 lsf_p_CN[M]; |
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50 |
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51 /* LSF memories for comfort noise interpolation */ |
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52 |
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53 Word16 lsf_old_CN[M], lsf_new_CN[M]; |
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54 |
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55 /* LSF parameter buffer */ |
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56 |
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57 extern Word16 lsf_old_rx[DTX_HANGOVER][M]; |
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58 |
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59 void D_plsf_5 ( |
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60 Word16 *indice, /* input : quantization indices of 5 submatrices */ |
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61 Word16 *lsp1_q, /* output: quantized 1st LSP vector */ |
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62 Word16 *lsp2_q, /* output: quantized 2nd LSP vector */ |
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63 Word16 bfi, /* input : bad frame indicator (set to 1 if a bad |
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64 frame is received) */ |
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65 Word16 rxdtx_ctrl, /* input : RX DTX control word */ |
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66 Word16 rx_dtx_state /* input : state of the comfort noise insertion |
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67 period */ |
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68 ) |
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69 { |
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70 Word16 i; |
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71 const Word16 *p_dico; |
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72 Word16 temp, sign; |
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73 Word16 lsf1_r[M], lsf2_r[M]; |
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74 Word16 lsf1_q[M], lsf2_q[M]; |
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75 |
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76 /* Update comfort noise LSF quantizer memory */ |
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77 test (); logic16 (); |
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78 if ((rxdtx_ctrl & RX_UPD_SID_QUANT_MEM) != 0) |
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79 { |
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80 update_lsf_p_CN (lsf_old_rx, lsf_p_CN); |
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81 } |
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82 /* Handle cases of comfort noise LSF decoding in which past |
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83 valid SID frames are repeated */ |
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84 |
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85 test (); logic16 (); |
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86 test (); logic16 (); |
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87 test (); logic16 (); |
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88 if (((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0) |
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89 || ((rxdtx_ctrl & RX_INVALID_SID_FRAME) != 0) |
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90 || ((rxdtx_ctrl & RX_LOST_SID_FRAME) != 0)) |
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91 { |
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92 |
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93 test (); logic16 (); |
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94 if ((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0) |
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95 { |
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96 /* DTX active: no transmission. Interpolate LSF values in memory */ |
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97 interpolate_CN_lsf (lsf_old_CN, lsf_new_CN, lsf2_q, rx_dtx_state); |
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98 } |
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99 else |
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100 { /* Invalid or lost SID frame: use LSFs |
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101 from last good SID frame */ |
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102 for (i = 0; i < M; i++) |
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103 { |
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104 lsf_old_CN[i] = lsf_new_CN[i]; move16 (); |
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105 lsf2_q[i] = lsf_new_CN[i]; move16 (); |
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106 past_r2_q[i] = 0; move16 (); |
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107 } |
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108 } |
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109 |
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110 for (i = 0; i < M; i++) |
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111 { |
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112 past_lsf_q[i] = lsf2_q[i]; move16 (); |
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113 } |
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114 |
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115 /* convert LSFs to the cosine domain */ |
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116 Lsf_lsp (lsf2_q, lsp2_q, M); |
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117 |
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118 return; |
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119 } |
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120 |
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121 test (); |
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122 if (bfi != 0) /* if bad frame */ |
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123 { |
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124 /* use the past LSFs slightly shifted towards their mean */ |
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125 |
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126 for (i = 0; i < M; i++) |
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127 { |
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128 /* lsfi_q[i] = ALPHA*past_lsf_q[i] + ONE_ALPHA*mean_lsf[i]; */ |
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129 |
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130 lsf1_q[i] = add (mult (past_lsf_q[i], ALPHA), |
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131 mult (mean_lsf[i], ONE_ALPHA)); |
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132 move16 (); |
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133 |
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134 lsf2_q[i] = lsf1_q[i]; move16 (); |
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135 } |
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136 |
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137 /* estimate past quantized residual to be used in next frame */ |
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138 |
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139 for (i = 0; i < M; i++) |
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140 { |
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141 /* temp = mean_lsf[i] + past_r2_q[i] * PRED_FAC; */ |
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142 |
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143 temp = add (mean_lsf[i], mult (past_r2_q[i], PRED_FAC)); |
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144 |
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145 past_r2_q[i] = sub (lsf2_q[i], temp); |
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146 move16 (); |
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147 } |
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148 } |
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149 else |
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150 /* if good LSFs received */ |
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151 { |
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152 /* decode prediction residuals from 5 received indices */ |
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153 |
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154 p_dico = &dico1_lsf[shl (indice[0], 2)]; |
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155 lsf1_r[0] = *p_dico++; move16 (); |
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156 lsf1_r[1] = *p_dico++; move16 (); |
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157 lsf2_r[0] = *p_dico++; move16 (); |
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158 lsf2_r[1] = *p_dico++; move16 (); |
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159 |
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160 p_dico = &dico2_lsf[shl (indice[1], 2)]; |
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161 lsf1_r[2] = *p_dico++; move16 (); |
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162 lsf1_r[3] = *p_dico++; move16 (); |
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163 lsf2_r[2] = *p_dico++; move16 (); |
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164 lsf2_r[3] = *p_dico++; move16 (); |
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165 |
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166 sign = indice[2] & 1; logic16 (); |
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167 i = shr (indice[2], 1); |
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168 p_dico = &dico3_lsf[shl (i, 2)]; move16 (); |
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169 |
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170 test (); |
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171 if (sign == 0) |
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172 { |
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173 lsf1_r[4] = *p_dico++; move16 (); |
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174 lsf1_r[5] = *p_dico++; move16 (); |
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175 lsf2_r[4] = *p_dico++; move16 (); |
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176 lsf2_r[5] = *p_dico++; move16 (); |
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177 } |
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178 else |
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179 { |
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180 lsf1_r[4] = negate (*p_dico++); move16 (); |
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181 lsf1_r[5] = negate (*p_dico++); move16 (); |
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182 lsf2_r[4] = negate (*p_dico++); move16 (); |
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183 lsf2_r[5] = negate (*p_dico++); move16 (); |
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184 } |
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185 |
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186 p_dico = &dico4_lsf[shl (indice[3], 2)];move16 (); |
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187 lsf1_r[6] = *p_dico++; move16 (); |
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188 lsf1_r[7] = *p_dico++; move16 (); |
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189 lsf2_r[6] = *p_dico++; move16 (); |
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190 lsf2_r[7] = *p_dico++; move16 (); |
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191 |
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192 p_dico = &dico5_lsf[shl (indice[4], 2)];move16 (); |
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193 lsf1_r[8] = *p_dico++; move16 (); |
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194 lsf1_r[9] = *p_dico++; move16 (); |
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195 lsf2_r[8] = *p_dico++; move16 (); |
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196 lsf2_r[9] = *p_dico++; move16 (); |
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197 |
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198 /* Compute quantized LSFs and update the past quantized residual */ |
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199 /* Use lsf_p_CN as predicted LSF vector in case of no speech |
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200 activity */ |
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201 |
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202 test (); logic16 (); |
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203 if ((rxdtx_ctrl & RX_SP_FLAG) != 0) |
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204 { |
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205 for (i = 0; i < M; i++) |
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206 { |
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207 temp = add (mean_lsf[i], mult (past_r2_q[i], PRED_FAC)); |
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208 lsf1_q[i] = add (lsf1_r[i], temp); |
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209 move16 (); |
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210 lsf2_q[i] = add (lsf2_r[i], temp); |
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211 move16 (); |
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212 past_r2_q[i] = lsf2_r[i]; move16 (); |
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213 } |
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214 } |
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215 else |
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216 { /* Valid SID frame */ |
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217 for (i = 0; i < M; i++) |
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218 { |
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219 lsf2_q[i] = add (lsf2_r[i], lsf_p_CN[i]); |
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220 move16 (); |
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221 |
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222 /* Use the dequantized values of lsf2 also for lsf1 */ |
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223 lsf1_q[i] = lsf2_q[i]; move16 (); |
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224 |
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225 past_r2_q[i] = 0; move16 (); |
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226 } |
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227 } |
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228 } |
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229 |
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230 /* verification that LSFs have minimum distance of LSF_GAP Hz */ |
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231 |
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232 Reorder_lsf (lsf1_q, LSF_GAP, M); |
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233 Reorder_lsf (lsf2_q, LSF_GAP, M); |
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234 |
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235 test (); logic16 (); |
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236 if ((rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0) |
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237 { |
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238 for (i = 0; i < M; i++) |
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239 { |
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240 lsf_new_CN[i] = lsf2_q[i]; move16 (); |
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241 } |
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242 } |
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243 test (); logic16 (); |
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244 if ((rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0) |
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245 { |
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246 for (i = 0; i < M; i++) |
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247 { |
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248 lsf_old_CN[i] = lsf_new_CN[i]; move16 (); |
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249 lsf_new_CN[i] = lsf2_q[i]; move16 (); |
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250 } |
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251 } |
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252 test (); logic16 (); |
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253 if ((rxdtx_ctrl & RX_SP_FLAG) != 0) |
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254 { |
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255 /* Update lsf history with quantized LSFs |
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256 when speech activity is present. If the current frame is |
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257 a bad one, update with most recent good comfort noise LSFs */ |
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258 |
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259 if (bfi==0) |
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260 { |
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261 update_lsf_history (lsf1_q, lsf2_q, lsf_old_rx); |
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262 } |
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263 else |
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264 { |
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265 update_lsf_history (lsf_new_CN, lsf_new_CN, lsf_old_rx); |
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266 } |
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267 |
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268 for (i = 0; i < M; i++) |
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269 { |
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270 lsf_old_CN[i] = lsf2_q[i]; move16 (); |
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271 } |
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272 } |
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273 else |
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274 { |
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275 interpolate_CN_lsf (lsf_old_CN, lsf_new_CN, lsf2_q, rx_dtx_state); |
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276 } |
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277 |
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278 for (i = 0; i < M; i++) |
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279 { |
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280 past_lsf_q[i] = lsf2_q[i]; move16 (); |
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281 } |
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282 |
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283 /* convert LSFs to the cosine domain */ |
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284 |
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285 Lsf_lsp (lsf1_q, lsp1_q, M); |
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286 Lsf_lsp (lsf2_q, lsp2_q, M); |
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287 |
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288 return; |
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289 } |