annotate libgsmefr/e_homing.c @ 232:8710c94df334

miscutil: new program pcm8-to-pcm16
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 07 May 2023 19:03:36 +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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60 if (j)
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61 break;
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62 }
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64 return !j;
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65 }
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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)
53
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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 */
53
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151
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152 return;
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153 }