FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/e_homing.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents 035424a6ca83
children
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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
68
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144 void EFR_encoder_reset (struct EFR_encoder_state *st, int dtx)
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145 {
68
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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 }