FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/e_homing.c @ 169:0c965c3c5e6e
doc/Utils-overview: new Calypso TCH DL utils
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 25 Dec 2022 09:53:04 +0000 |
parents | 035424a6ca83 |
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rev | line source |
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1 /************************************************************************** |
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2 * |
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3 * File Name: e_homing.c |
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4 * |
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5 * Purpose: |
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6 * This file contains the following functions: |
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7 * |
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8 * encoder_homing_frame_test() checks if a frame of input samples |
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9 * matches the Encoder Homing Frame pattern. |
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10 * |
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11 * encoder_reset() called by reset_enc() to reset all |
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12 * the state variables for the encoder. |
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13 * |
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14 * reset_enc() calls functions to reset the state |
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15 * variables for the encoder and VAD, and |
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16 * for the transmit DTX and Comfort Noise. |
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17 * |
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18 **************************************************************************/ |
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19 |
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20 #include "gsm_efr.h" |
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21 #include "typedef.h" |
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22 #include "namespace.h" |
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23 #include "cnst.h" |
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24 #include "vad.h" |
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25 #include "dtx.h" |
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26 #include "codec.h" |
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27 #include "sig_proc.h" |
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28 #include "memops.h" |
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29 #include "enc_state.h" |
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30 #include "e_homing.h" |
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31 |
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32 /*************************************************************************** |
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33 * |
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34 * FUNCTION NAME: encoder_homing_frame_test |
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35 * |
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36 * PURPOSE: |
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37 * Checks if a frame of input samples matches the Encoder Homing Frame |
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38 * pattern, which is 0x0008 for all 160 samples in the frame. |
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39 * |
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40 * INPUT: |
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41 * input_frame[] one frame of speech samples |
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42 * |
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43 * OUTPUT: |
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44 * None |
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45 * |
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46 * RETURN: |
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47 * 0 input frame does not match the Encoder Homing Frame pattern. |
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48 * 1 input frame matches the Encoder Homing Frame pattern. |
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49 * |
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50 **************************************************************************/ |
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51 |
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52 Word16 encoder_homing_frame_test (const Word16 input_frame[]) |
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53 { |
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54 Word16 i, j; |
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55 |
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56 for (i = 0; i < L_FRAME; i++) |
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57 { |
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58 j = input_frame[i] ^ EHF_MASK; |
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59 |
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60 if (j) |
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61 break; |
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62 } |
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63 |
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64 return !j; |
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65 } |
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66 |
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67 /*************************************************************************** |
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68 * |
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69 * FUNCTION NAME: encoder_reset |
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70 * |
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71 * PURPOSE: |
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72 * resets all of the state variables for the encoder |
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73 * |
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74 * INPUT: |
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75 * None |
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76 * |
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77 * OUTPUT: |
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78 * None |
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79 * |
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80 * RETURN: |
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81 * None |
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82 * |
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83 **************************************************************************/ |
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84 |
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85 void encoder_reset (struct EFR_encoder_state *st) |
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86 { |
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87 Word16 i; |
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88 |
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89 /* reset all the encoder state variables */ |
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90 /* ------------------------------------- */ |
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91 |
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92 /* Variables in cod_12k2.c: */ |
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93 Init_Coder_12k2 (st); |
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94 |
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95 /* Variables in levinson.c: */ |
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96 st->old_A[0] = 4096; /* Last A(z) for case of unstable filter */ |
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97 for (i = 1; i < M + 1; i++) |
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98 { |
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99 st->old_A[i] = 0; |
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100 } |
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101 |
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102 /* Variables in pre_proc.c: */ |
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103 Init_Pre_Process (st); |
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104 |
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105 /* Variables in q_gains.c: */ |
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106 for (i = 0; i < 4; i++) |
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107 { |
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108 st->past_qua_en[i] = -2381; /* past quantized energies */ |
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109 } |
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110 |
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111 st->pred[0] = 44; /* MA prediction coeff */ |
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112 st->pred[1] = 37; /* MA prediction coeff */ |
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113 st->pred[2] = 22; /* MA prediction coeff */ |
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114 st->pred[3] = 12; /* MA prediction coeff */ |
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115 |
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116 /* Variables in q_plsf_5.c: */ |
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117 for (i = 0; i < M; i++) |
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118 { |
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119 st->past_r2_q[i] = 0; /* Past quantized prediction error */ |
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120 } |
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121 |
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122 return; |
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123 } |
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124 |
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125 /*************************************************************************** |
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126 * |
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127 * FUNCTION NAME: reset_enc |
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128 * |
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129 * PURPOSE: |
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130 * resets all of the state variables for the encoder and VAD, and for |
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131 * the transmit DTX and Comfort Noise. |
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132 * |
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133 * INPUT: |
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134 * None |
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135 * |
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136 * OUTPUT: |
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137 * None |
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138 * |
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139 * RETURN: |
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140 * None |
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141 * |
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142 **************************************************************************/ |
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143 |
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144 void EFR_encoder_reset (struct EFR_encoder_state *st, int dtx) |
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145 { |
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146 st->dtx_mode = dtx; |
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147 |
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148 encoder_reset (st); /* reset all the state variables in the speech encoder*/ |
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149 vad_reset (st); /* reset all the VAD state variables */ |
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150 reset_tx_dtx (st); /* reset all the transmit DTX and CN variables */ |
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151 |
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152 return; |
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153 } |