FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/d_plsf_5.c @ 148:bbe5669f0f29
gsmefr-cod-parse: add BE support
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 14 Dec 2022 17:21:05 +0000 |
parents | cc08498ed21b |
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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 "gsm_efr.h" |
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17 #include "typedef.h" |
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18 #include "namespace.h" |
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19 #include "basic_op.h" |
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20 #include "no_count.h" |
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21 #include "codec.h" |
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22 #include "sig_proc.h" |
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23 #include "memops.h" |
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24 |
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25 #include "q_plsf5_tab.h" /* Codebooks of LSF prediction residual */ |
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26 |
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27 #include "cnst.h" |
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28 #include "dtx.h" |
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29 #include "dec_state.h" |
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30 |
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31 /* M ->order of linear prediction filter */ |
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32 /* LSF_GAP -> Minimum distance between LSF after quantization */ |
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33 /* 50 Hz = 205 */ |
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34 /* PRED_FAC -> Prediction factor = 0.65 */ |
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35 /* ALPHA -> 0.9 */ |
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36 /* ONE_ALPHA-> (1.0-ALPHA) */ |
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37 |
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38 #define M 10 |
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39 #define LSF_GAP 205 |
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40 #define PRED_FAC 21299 |
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41 #define ALPHA 31128 |
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42 #define ONE_ALPHA 1639 |
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43 |
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44 void D_plsf_5 ( |
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45 struct EFR_decoder_state *st, |
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46 const Word16 *indice, /* input : quantization indices of 5 submatrices */ |
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47 Word16 *lsp1_q, /* output: quantized 1st LSP vector */ |
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48 Word16 *lsp2_q, /* output: quantized 2nd LSP vector */ |
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49 Word16 bfi, /* input : bad frame indicator (set to 1 if a bad |
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50 frame is received) */ |
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51 Word16 rxdtx_ctrl, /* input : RX DTX control word */ |
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52 Word16 rx_dtx_state /* input : state of the comfort noise insertion |
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53 period */ |
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54 ) |
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55 { |
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56 Word16 i; |
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57 const Word16 *p_dico; |
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58 Word16 temp, sign; |
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59 Word16 lsf1_r[M], lsf2_r[M]; |
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60 Word16 lsf1_q[M], lsf2_q[M]; |
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61 |
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62 /* Update comfort noise LSF quantizer memory */ |
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63 if ((rxdtx_ctrl & RX_UPD_SID_QUANT_MEM) != 0) |
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64 { |
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65 update_lsf_p_CN (st->lsf_old_rx, st->lsf_p_CN); |
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66 } |
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67 /* Handle cases of comfort noise LSF decoding in which past |
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68 valid SID frames are repeated */ |
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69 |
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70 if (((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0) |
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71 || ((rxdtx_ctrl & RX_INVALID_SID_FRAME) != 0) |
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72 || ((rxdtx_ctrl & RX_LOST_SID_FRAME) != 0)) |
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73 { |
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74 |
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75 if ((rxdtx_ctrl & RX_NO_TRANSMISSION) != 0) |
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76 { |
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77 /* DTX active: no transmission. Interpolate LSF values in memory */ |
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78 interpolate_CN_lsf (st->lsf_old_CN, st->lsf_new_CN, lsf2_q, |
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79 rx_dtx_state); |
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80 } |
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81 else |
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82 { /* Invalid or lost SID frame: use LSFs |
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83 from last good SID frame */ |
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84 for (i = 0; i < M; i++) |
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85 { |
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86 st->lsf_old_CN[i] = st->lsf_new_CN[i]; |
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87 lsf2_q[i] = st->lsf_new_CN[i]; |
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88 st->past_r2_q[i] = 0; |
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89 } |
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90 } |
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91 |
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92 for (i = 0; i < M; i++) |
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93 { |
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94 st->past_lsf_q[i] = lsf2_q[i]; |
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95 } |
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96 |
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97 /* convert LSFs to the cosine domain */ |
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98 Lsf_lsp (lsf2_q, lsp2_q, M); |
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99 |
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100 return; |
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101 } |
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102 |
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103 if (bfi != 0) /* if bad frame */ |
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104 { |
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105 /* use the past LSFs slightly shifted towards their mean */ |
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106 |
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107 for (i = 0; i < M; i++) |
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108 { |
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109 /* lsfi_q[i] = ALPHA*past_lsf_q[i] + ONE_ALPHA*mean_lsf[i]; */ |
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110 |
63
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111 lsf1_q[i] = add (mult (st->past_lsf_q[i], ALPHA), |
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112 mult (mean_lsf[i], ONE_ALPHA)); |
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113 |
63
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114 lsf2_q[i] = lsf1_q[i]; |
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115 } |
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116 |
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117 /* estimate past quantized residual to be used in next frame */ |
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118 |
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119 for (i = 0; i < M; i++) |
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120 { |
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121 /* temp = mean_lsf[i] + past_r2_q[i] * PRED_FAC; */ |
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122 |
63
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123 temp = add (mean_lsf[i], mult (st->past_r2_q[i], PRED_FAC)); |
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124 |
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125 st->past_r2_q[i] = sub (lsf2_q[i], temp); |
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126 } |
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127 } |
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128 else |
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129 /* if good LSFs received */ |
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130 { |
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131 /* decode prediction residuals from 5 received indices */ |
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132 |
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133 p_dico = &dico1_lsf[shl (indice[0], 2)]; |
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134 lsf1_r[0] = *p_dico++; move16 (); |
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135 lsf1_r[1] = *p_dico++; move16 (); |
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136 lsf2_r[0] = *p_dico++; move16 (); |
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137 lsf2_r[1] = *p_dico++; move16 (); |
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138 |
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139 p_dico = &dico2_lsf[shl (indice[1], 2)]; |
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140 lsf1_r[2] = *p_dico++; move16 (); |
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141 lsf1_r[3] = *p_dico++; move16 (); |
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142 lsf2_r[2] = *p_dico++; move16 (); |
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143 lsf2_r[3] = *p_dico++; move16 (); |
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144 |
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145 sign = indice[2] & 1; logic16 (); |
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146 i = shr (indice[2], 1); |
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147 p_dico = &dico3_lsf[shl (i, 2)]; move16 (); |
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148 |
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149 test (); |
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150 if (sign == 0) |
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151 { |
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152 lsf1_r[4] = *p_dico++; move16 (); |
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153 lsf1_r[5] = *p_dico++; move16 (); |
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154 lsf2_r[4] = *p_dico++; move16 (); |
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155 lsf2_r[5] = *p_dico++; move16 (); |
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156 } |
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157 else |
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158 { |
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159 lsf1_r[4] = negate (*p_dico++); move16 (); |
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160 lsf1_r[5] = negate (*p_dico++); move16 (); |
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161 lsf2_r[4] = negate (*p_dico++); move16 (); |
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162 lsf2_r[5] = negate (*p_dico++); move16 (); |
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163 } |
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164 |
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165 p_dico = &dico4_lsf[shl (indice[3], 2)];move16 (); |
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166 lsf1_r[6] = *p_dico++; move16 (); |
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167 lsf1_r[7] = *p_dico++; move16 (); |
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168 lsf2_r[6] = *p_dico++; move16 (); |
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169 lsf2_r[7] = *p_dico++; move16 (); |
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170 |
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171 p_dico = &dico5_lsf[shl (indice[4], 2)];move16 (); |
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172 lsf1_r[8] = *p_dico++; move16 (); |
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173 lsf1_r[9] = *p_dico++; move16 (); |
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174 lsf2_r[8] = *p_dico++; move16 (); |
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175 lsf2_r[9] = *p_dico++; move16 (); |
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176 |
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177 /* Compute quantized LSFs and update the past quantized residual */ |
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178 /* Use lsf_p_CN as predicted LSF vector in case of no speech |
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179 activity */ |
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180 |
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181 if ((rxdtx_ctrl & RX_SP_FLAG) != 0) |
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182 { |
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183 for (i = 0; i < M; i++) |
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184 { |
63
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185 temp = add (mean_lsf[i], mult (st->past_r2_q[i], PRED_FAC)); |
53
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186 lsf1_q[i] = add (lsf1_r[i], temp); |
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187 lsf2_q[i] = add (lsf2_r[i], temp); |
63
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188 st->past_r2_q[i] = lsf2_r[i]; |
53
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189 } |
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190 } |
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191 else |
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192 { /* Valid SID frame */ |
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193 for (i = 0; i < M; i++) |
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194 { |
63
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195 lsf2_q[i] = add (lsf2_r[i], st->lsf_p_CN[i]); |
53
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196 |
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197 /* Use the dequantized values of lsf2 also for lsf1 */ |
63
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198 lsf1_q[i] = lsf2_q[i]; |
53
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199 |
63
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200 st->past_r2_q[i] = 0; |
53
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201 } |
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202 } |
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203 } |
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204 |
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205 /* verification that LSFs have minimum distance of LSF_GAP Hz */ |
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206 |
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207 Reorder_lsf (lsf1_q, LSF_GAP, M); |
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208 Reorder_lsf (lsf2_q, LSF_GAP, M); |
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209 |
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210 if ((rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0) |
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211 { |
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212 for (i = 0; i < M; i++) |
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213 { |
63
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53
diff
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|
214 st->lsf_new_CN[i] = lsf2_q[i]; |
53
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215 } |
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216 } |
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217 if ((rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0) |
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218 { |
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219 for (i = 0; i < M; i++) |
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220 { |
63
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221 st->lsf_old_CN[i] = st->lsf_new_CN[i]; |
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222 st->lsf_new_CN[i] = lsf2_q[i]; |
53
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223 } |
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224 } |
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225 if ((rxdtx_ctrl & RX_SP_FLAG) != 0) |
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226 { |
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227 /* Update lsf history with quantized LSFs |
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228 when speech activity is present. If the current frame is |
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229 a bad one, update with most recent good comfort noise LSFs */ |
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230 |
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231 if (bfi==0) |
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232 { |
63
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233 update_lsf_history (lsf1_q, lsf2_q, st->lsf_old_rx); |
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234 } |
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235 else |
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236 { |
63
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237 update_lsf_history (st->lsf_new_CN, st->lsf_new_CN, st->lsf_old_rx); |
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238 } |
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239 |
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240 for (i = 0; i < M; i++) |
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241 { |
63
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242 st->lsf_old_CN[i] = lsf2_q[i]; |
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243 } |
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244 } |
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245 else |
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246 { |
63
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247 interpolate_CN_lsf (st->lsf_old_CN, st->lsf_new_CN, lsf2_q, |
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248 rx_dtx_state); |
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249 } |
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250 |
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251 for (i = 0; i < M; i++) |
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252 { |
63
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253 st->past_lsf_q[i] = lsf2_q[i]; |
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254 } |
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255 |
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256 /* convert LSFs to the cosine domain */ |
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257 |
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258 Lsf_lsp (lsf1_q, lsp1_q, M); |
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259 Lsf_lsp (lsf2_q, lsp2_q, M); |
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260 |
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261 return; |
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262 } |