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annotate libgsmfr2/pp_bad.c @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 96c4ed5529bf
children
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6
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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 "tw_gsmfr.h"
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9 #include "pp_state.h"
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10 #include "pp_internal.h"
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11
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12 static int reduce_xmaxc(uint8_t *frame)
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13 {
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14 int mute_flag = 1;
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15 unsigned sub, xmaxc;
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16
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17 for (sub = 0; sub < 4; sub++) {
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18 xmaxc = ((frame[sub*7+6] & 0x1F) << 1) | (frame[sub*7+7] >> 7);
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19 if (xmaxc > 4) {
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20 xmaxc -= 4;
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21 mute_flag = 0;
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22 } else
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23 xmaxc = 0;
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24 frame[sub*7+6] &= 0xE0;
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25 frame[sub*7+6] |= xmaxc >> 1;
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26 frame[sub*7+7] &= 0x7F;
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27 frame[sub*7+7] |= (xmaxc & 1) << 7;
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28 }
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29 return mute_flag;
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30 }
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31
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32 static void random_grid_pos(struct gsmfr_preproc_state *st, uint8_t *frame)
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33 {
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34 unsigned sub, Mc;
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35
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36 for (sub = 0; sub < 4; sub++) {
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37 Mc = gsmfr_preproc_prng(st, 2);
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38 frame[sub*7+6] &= 0x9F;
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39 frame[sub*7+6] |= Mc << 5;
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40 }
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41 }
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42
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43 static int reduce_xmaxc_sid(struct gsmfr_preproc_state *st)
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44 {
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45 if (st->sid_xmaxc > 4) {
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46 st->sid_xmaxc -= 4;
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47 return 0;
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48 } else {
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49 st->sid_xmaxc = 0;
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50 return 1;
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51 }
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52 }
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53
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54 void gsmfr_preproc_bfi(struct gsmfr_preproc_state *st, int taf, uint8_t *frame)
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55 {
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56 int mute;
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57
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58 switch (st->rx_state) {
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59 case NO_DATA:
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60 memcpy(frame, &gsmfr_preproc_silence_frame,
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61 GSMFR_RTP_FRAME_LEN);
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62 if (st->dtxd_nodata_count) {
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63 st->dtxd_sid_flag = 0;
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64 st->dtxd_nodata_count--;
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65 } else
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66 st->dtxd_sid_flag = 1;
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67 return;
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68 case SPEECH:
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69 memcpy(frame, &st->speech_frame, GSMFR_RTP_FRAME_LEN);
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70 st->rx_state = SPEECH_MUTING;
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71 st->dtxd_sid_flag = 0;
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72 return;
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73 case SPEECH_MUTING:
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74 mute = reduce_xmaxc(st->speech_frame);
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75 memcpy(frame, &st->speech_frame, GSMFR_RTP_FRAME_LEN);
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76 random_grid_pos(st, frame);
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77 if (mute) {
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78 st->rx_state = NO_DATA;
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79 st->dtxd_nodata_count = 0;
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80 }
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81 st->dtxd_sid_flag = 0;
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82 return;
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83 case COMFORT_NOISE:
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84 st->dtxd_sid_flag = 1;
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85 if (taf)
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86 st->rx_state = LOST_SID;
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87 gsmfr_preproc_gen_cn(st, frame);
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88 return;
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89 case LOST_SID:
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90 st->dtxd_sid_flag = 1;
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91 if (taf) {
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92 st->rx_state = CN_MUTING;
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93 reduce_xmaxc_sid(st);
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94 st->dtxd_sid_flag = 0;
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95 }
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96 gsmfr_preproc_gen_cn(st, frame);
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97 return;
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98 case CN_MUTING:
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99 st->dtxd_sid_flag = 0;
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100 if (reduce_xmaxc_sid(st)) {
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101 st->rx_state = NO_DATA;
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102 memcpy(frame, &gsmfr_preproc_silence_frame,
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103 GSMFR_RTP_FRAME_LEN);
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104 st->dtxd_nodata_count = 3;
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105 } else
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106 gsmfr_preproc_gen_cn(st, frame);
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107 return;
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108 }
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109 }
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110
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111 void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *st, uint8_t *frame)
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112 {
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113 int mute;
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114
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115 switch (st->rx_state) {
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116 case NO_DATA:
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117 memcpy(frame, &gsmfr_preproc_silence_frame,
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118 GSMFR_RTP_FRAME_LEN);
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119 if (st->dtxd_nodata_count) {
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120 st->dtxd_sid_flag = 0;
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121 st->dtxd_nodata_count--;
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122 } else
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123 st->dtxd_sid_flag = 1;
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124 return;
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125 case SPEECH:
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126 /*
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127 * Make CN out of the last good speech frame, following the
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128 * "NOTE" at the end of section 6.1.2 in TS 46.031.
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129 */
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130 st->rx_state = COMFORT_NOISE;
530
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131 st->dtxd_sid_flag = 1;
242
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132 memcpy(st->sid_prefix, &st->speech_frame, 5);
248
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133 st->sid_xmaxc = gsmfr_preproc_xmaxc_mean(st->speech_frame);
242
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134 gsmfr_preproc_gen_cn(st, frame);
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135 return;
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136 case SPEECH_MUTING:
248
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137 /* ignore invalid SID in this state and act as if we got BFI */
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138 mute = reduce_xmaxc(st->speech_frame);
256
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139 memcpy(frame, &st->speech_frame, GSMFR_RTP_FRAME_LEN);
248
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140 random_grid_pos(st, frame);
530
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141 if (mute) {
248
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142 st->rx_state = NO_DATA;
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143 st->dtxd_nodata_count = 0;
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144 }
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145 st->dtxd_sid_flag = 0;
242
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146 return;
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147 case COMFORT_NOISE:
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148 case LOST_SID:
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149 st->rx_state = COMFORT_NOISE;
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150 st->dtxd_sid_flag = 1;
242
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151 gsmfr_preproc_gen_cn(st, frame);
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152 return;
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153 case CN_MUTING:
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154 st->dtxd_sid_flag = 0;
242
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155 if (reduce_xmaxc_sid(st)) {
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156 st->rx_state = NO_DATA;
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157 memcpy(frame, &gsmfr_preproc_silence_frame,
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158 GSMFR_RTP_FRAME_LEN);
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159 st->dtxd_nodata_count = 3;
242
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160 } else
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161 gsmfr_preproc_gen_cn(st, frame);
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162 return;
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163 }
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164 }
526
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165
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166 void gsmfr_preproc_bfi_bits(struct gsmfr_preproc_state *st,
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167 const uint8_t *bad_frame, int taf,
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168 uint8_t *frame_out)
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169 {
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170 if (gsmfr_preproc_sid_classify(bad_frame) == 0)
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171 gsmfr_preproc_bfi(st, taf, frame_out);
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172 else
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173 gsmfr_preproc_invalid_sid(st, frame_out);
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174 }