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annotate libgsmefr/e_homing.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +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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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 }