FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/dtx_common.c @ 247:56d3fbacd115
dev: new program xmaxc-tables
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 12 May 2023 02:04:42 +0000 |
parents | 7bc011aceb7f |
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rev | line source |
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1 /* |
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2 * This file is a product of splitting ETSI EFR dtx.c into parts; |
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3 * the present module is the common part for both the encoder and |
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4 * the decoder. |
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5 */ |
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6 |
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7 #include "gsm_efr.h" |
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8 #include "typedef.h" |
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9 #include "namespace.h" |
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10 #include "basic_op.h" |
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11 #include "cnst.h" |
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12 #include "sig_proc.h" |
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13 #include "memops.h" |
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14 #include "no_count.h" |
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15 #include "dtx.h" |
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16 #include "dtx_defs.h" |
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17 |
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18 /************************************************************************* |
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19 * |
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20 * FUNCTION NAME: update_lsf_history |
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21 * |
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22 * PURPOSE: Update the LSF parameter history. The LSF parameters kept |
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23 * in the buffer are used later for computing the reference |
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24 * LSF parameter vector and the averaged LSF parameter vector. |
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25 * |
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26 * INPUTS: lsf1[0..9] LSF vector of the 1st half of the frame |
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27 * lsf2[0..9] LSF vector of the 2nd half of the frame |
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28 * lsf_old[0..DTX_HANGOVER-1][0..M-1] |
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29 * Old LSF history |
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30 * |
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31 * OUTPUTS: lsf_old[0..DTX_HANGOVER-1][0..M-1] |
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32 * Updated LSF history |
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33 * |
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34 * RETURN VALUE: none |
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35 * |
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36 *************************************************************************/ |
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37 |
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38 void update_lsf_history ( |
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39 Word16 lsf1[M], |
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40 Word16 lsf2[M], |
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41 Word16 lsf_old[DTX_HANGOVER][M] |
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42 ) |
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43 { |
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44 Word16 i, j, temp; |
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45 |
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46 /* shift LSF data to make room for LSFs from current frame */ |
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47 /* This can also be implemented by using circular buffering */ |
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48 |
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49 for (i = DTX_HANGOVER - 1; i > 0; i--) |
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50 { |
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51 for (j = 0; j < M; j++) |
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52 { |
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53 lsf_old[i][j] = lsf_old[i - 1][j]; move16 (); |
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54 } |
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55 } |
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56 |
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57 /* Store new LSF data to lsf_old buffer */ |
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58 |
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59 for (i = 0; i < M; i++) |
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60 { |
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61 temp = add (shr (lsf1[i], 1), shr (lsf2[i], 1)); |
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62 lsf_old[0][i] = temp; move16 (); |
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63 } |
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64 |
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65 return; |
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66 } |
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67 |
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68 /************************************************************************* |
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69 * |
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70 * FUNCTION NAME: update_lsf_p_CN |
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71 * |
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72 * PURPOSE: Update the reference LSF parameter vector. The reference |
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73 * vector is computed by averaging the quantized LSF parameter |
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74 * vectors which exist in the LSF parameter history. |
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75 * |
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76 * INPUTS: lsf_old[0..DTX_HANGOVER-1][0..M-1] |
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77 * LSF parameter history |
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78 * |
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79 * OUTPUTS: lsf_p_CN[0..9] Computed reference LSF parameter vector |
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80 * |
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81 * RETURN VALUE: none |
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82 * |
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83 *************************************************************************/ |
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84 |
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85 void update_lsf_p_CN ( |
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86 Word16 lsf_old[DTX_HANGOVER][M], |
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87 Word16 lsf_p_CN[M] |
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88 ) |
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89 { |
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90 Word16 i, j; |
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91 Word32 L_temp; |
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92 |
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93 for (j = 0; j < M; j++) |
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94 { |
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95 L_temp = L_mult (INV_DTX_HANGOVER, lsf_old[0][j]); |
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96 for (i = 1; i < DTX_HANGOVER; i++) |
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97 { |
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98 L_temp = L_mac (L_temp, INV_DTX_HANGOVER, lsf_old[i][j]); |
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99 } |
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100 lsf_p_CN[j] = round (L_temp); move16 (); |
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101 } |
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102 |
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103 return; |
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104 } |
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105 |
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106 /************************************************************************* |
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107 * |
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108 * FUNCTION NAME: update_gcode0_CN |
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109 * |
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110 * PURPOSE: Update the reference fixed codebook gain parameter value. |
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111 * The reference value is computed by averaging the quantized |
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112 * fixed codebook gain parameter values which exist in the |
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113 * fixed codebook gain parameter history. |
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114 * |
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115 * INPUTS: gain_code_old[0..4*DTX_HANGOVER-1] |
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116 * fixed codebook gain parameter history |
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117 * |
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118 * OUTPUTS: none |
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119 * |
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120 * RETURN VALUE: Computed reference fixed codebook gain |
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121 * |
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122 *************************************************************************/ |
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123 |
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124 Word16 update_gcode0_CN ( |
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125 Word16 gain_code_old[4 * DTX_HANGOVER] |
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126 ) |
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127 { |
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128 Word16 i, j; |
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129 Word32 L_temp, L_ret; |
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130 |
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131 L_ret = 0L; move32 (); |
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132 for (i = 0; i < DTX_HANGOVER; i++) |
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133 { |
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134 L_temp = L_mult (0x1fff, gain_code_old[4 * i]); |
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135 for (j = 1; j < 4; j++) |
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136 { |
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137 L_temp = L_mac (L_temp, 0x1fff, gain_code_old[4 * i + j]); |
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138 } |
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139 L_ret = L_mac (L_ret, INV_DTX_HANGOVER, extract_h (L_temp)); |
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140 } |
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141 |
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142 return extract_h (L_ret); |
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143 } |
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144 |
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145 /************************************************************************* |
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146 * |
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147 * FUNCTION NAME: build_CN_code |
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148 * |
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149 * PURPOSE: Compute the comfort noise fixed codebook excitation. The |
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150 * gains of the pulses are always +/-1. |
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151 * |
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152 * INPUTS: *seed Old CN generator shift register state |
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153 * |
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154 * OUTPUTS: cod[0..39] Generated comfort noise fixed codebook vector |
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155 * *seed Updated CN generator shift register state |
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156 * |
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157 * RETURN VALUE: none |
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158 * |
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159 *************************************************************************/ |
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160 |
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161 void build_CN_code ( |
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162 Word16 cod[], |
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163 Word32 *seed |
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164 ) |
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165 { |
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166 Word16 i, j, k; |
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167 |
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168 for (i = 0; i < L_SUBFR; i++) |
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169 { |
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170 cod[i] = 0; move16 (); |
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171 } |
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172 |
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173 for (k = 0; k < NB_PULSE; k++) |
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174 { |
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175 i = pseudonoise (seed, 2); /* generate pulse position */ |
191
7bc011aceb7f
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119
diff
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176 i *= 10; |
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119
diff
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177 i += k; |
66
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178 |
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179 j = pseudonoise (seed, 1); /* generate sign */ |
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180 |
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181 test (); |
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182 if (j > 0) |
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183 { |
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184 cod[i] = 4096; move16 (); |
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185 } |
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186 else |
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187 { |
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188 cod[i] = -4096; move16 (); |
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189 } |
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190 } |
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191 |
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192 return; |
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193 } |
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194 |
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195 /************************************************************************* |
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196 * |
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197 * FUNCTION NAME: pseudonoise |
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198 * |
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199 * PURPOSE: Generate a random integer value to use in comfort noise |
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200 * generation. The algorithm uses polynomial x^31 + x^3 + 1 |
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201 * (length of PN sequence is 2^31 - 1). |
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202 * |
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203 * INPUTS: *shift_reg Old CN generator shift register state |
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204 * |
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205 * |
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206 * OUTPUTS: *shift_reg Updated CN generator shift register state |
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207 * |
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208 * RETURN VALUE: Generated random integer value |
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209 * |
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210 *************************************************************************/ |
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211 |
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212 Word16 pseudonoise ( |
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213 Word32 *shift_reg, |
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214 Word16 no_bits |
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215 ) |
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216 { |
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217 Word16 noise_bits, Sn, i; |
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218 |
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219 noise_bits = 0; move16 (); |
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220 for (i = 0; i < no_bits; i++) |
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221 { |
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222 /* State n == 31 */ |
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223 test (); logic32 (); |
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224 if ((*shift_reg & 0x00000001L) != 0) |
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225 { |
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226 Sn = 1; move16 (); |
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227 } |
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228 else |
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229 { |
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230 Sn = 0; move16 (); |
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231 } |
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232 |
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233 /* State n == 3 */ |
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234 test (); logic32 (); |
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235 if ((*shift_reg & 0x10000000L) != 0) |
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236 { |
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237 Sn = Sn ^ 1; logic16 (); |
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238 } |
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239 else |
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240 { |
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241 Sn = Sn ^ 0; logic16 (); |
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242 } |
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243 |
191
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244 noise_bits <<= 1; |
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245 noise_bits |= *shift_reg & 1; |
66
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246 |
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247 *shift_reg = L_shr (*shift_reg, 1); move32 (); |
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248 if (Sn & 1) |
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249 { |
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250 *shift_reg = *shift_reg | 0x40000000L; move32 (); logic32 (); |
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251 } |
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252 } |
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253 |
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254 return noise_bits; |
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255 } |