FreeCalypso > hg > gsm-codec-lib

annotate libgsmfrp/bad_frame.c @ 288:e0b46ac2c326

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gsmfr-encode-r: convert to libgsmfr2
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 06:20:04 +0000
parents 6ac547f0b903
children
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1 /*
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2 * In this module we implement our handling of BFI frame gaps
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3 * and invalid SID frames.
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4 */
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5
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6 #include <stdint.h>
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7 #include <string.h>
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8 #include "gsm_fr_preproc.h"
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9 #include "internal.h"
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10
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11 static int reduce_xmaxc(gsm_byte *frame)
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12 {
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13 int mute_flag = 1;
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14 unsigned sub, xmaxc;
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15
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16 for (sub = 0; sub < 4; sub++) {
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17 xmaxc = ((frame[sub*7+6] & 0x1F) << 1) | (frame[sub*7+7] >> 7);
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18 if (xmaxc > 4) {
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19 xmaxc -= 4;
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20 mute_flag = 0;
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21 } else
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22 xmaxc = 0;
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23 frame[sub*7+6] &= 0xE0;
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24 frame[sub*7+6] |= xmaxc >> 1;
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25 frame[sub*7+7] &= 0x7F;
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26 frame[sub*7+7] |= (xmaxc & 1) << 7;
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27 }
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28 return mute_flag;
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29 }
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30
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31 static void random_grid_pos(struct gsmfr_preproc_state *st, gsm_byte *frame)
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32 {
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33 unsigned sub, Mc;
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34
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35 for (sub = 0; sub < 4; sub++) {
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36 Mc = gsmfr_preproc_prng(st, 2);
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37 frame[sub*7+6] &= 0x9F;
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38 frame[sub*7+6] |= Mc << 5;
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39 }
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40 }
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41
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42 static int reduce_xmaxc_sid(struct gsmfr_preproc_state *st)
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43 {
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44 if (st->sid_xmaxc > 4) {
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45 st->sid_xmaxc -= 4;
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46 return 0;
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47 } else {
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48 st->sid_xmaxc = 0;
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49 return 1;
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50 }
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51 }
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52
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53 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *st, int taf, gsm_byte *frame)
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54 {
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55 int mute;
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56
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57 switch (st->rx_state) {
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58 case NO_DATA:
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59 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame));
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60 return;
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61 case SPEECH:
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62 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
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63 st->rx_state = SPEECH_MUTING;
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64 return;
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65 case SPEECH_MUTING:
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66 mute = reduce_xmaxc(st->speech_frame);
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67 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
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68 random_grid_pos(st, frame);
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69 if (mute)
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70 st->rx_state = NO_DATA;
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71 return;
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72 case COMFORT_NOISE:
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73 if (taf)
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74 st->rx_state = LOST_SID;
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75 gsmfr_preproc_gen_cn(st, frame);
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76 return;
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77 case LOST_SID:
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78 if (taf) {
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79 st->rx_state = CN_MUTING;
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80 reduce_xmaxc_sid(st);
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81 }
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82 gsmfr_preproc_gen_cn(st, frame);
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83 return;
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84 case CN_MUTING:
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85 if (reduce_xmaxc_sid(st)) {
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86 st->rx_state = NO_DATA;
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87 memcpy(frame, &gsmfr_preproc_silence_frame,
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88 sizeof(gsm_frame));
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89 } else
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90 gsmfr_preproc_gen_cn(st, frame);
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91 return;
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92 }
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93 }
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94
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95 void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *st, gsm_byte *frame)
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96 {
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97 int mute;
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98
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99 switch (st->rx_state) {
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100 case NO_DATA:
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101 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame));
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102 return;
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103 case SPEECH:
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104 /*
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105 * Make CN out of the last good speech frame, following the
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106 * "NOTE" at the end of section 6.1.2 in TS 46.031.
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107 */
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108 st->rx_state = COMFORT_NOISE;
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109 memcpy(st->sid_prefix, &st->speech_frame, 5);
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110 st->sid_xmaxc = gsmfr_preproc_xmaxc_mean(st->speech_frame);
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111 gsmfr_preproc_gen_cn(st, frame);
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112 return;
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113 case SPEECH_MUTING:
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114 /* ignore invalid SID in this state and act as if we got BFI */
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115 mute = reduce_xmaxc(st->speech_frame);
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116 memcpy(frame, &st->speech_frame, sizeof(gsm_frame));
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117 random_grid_pos(st, frame);
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118 if (mute)
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119 st->rx_state = NO_DATA;
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120 return;
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121 case COMFORT_NOISE:
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122 case LOST_SID:
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123 st->rx_state = COMFORT_NOISE;
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124 gsmfr_preproc_gen_cn(st, frame);
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125 return;
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126 case CN_MUTING:
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127 if (reduce_xmaxc_sid(st)) {
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128 st->rx_state = NO_DATA;
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129 memcpy(frame, &gsmfr_preproc_silence_frame,
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130 sizeof(gsm_frame));
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131 } else
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132 gsmfr_preproc_gen_cn(st, frame);
f081a6850fb5 libgsmfrp: new refined implementation
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parents: 109
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133 return;
f081a6850fb5 libgsmfrp: new refined implementation
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parents: 109
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134 }
f081a6850fb5 libgsmfrp: new refined implementation
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parents: 109
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135 }