FreeCalypso > hg > gsm-codec-lib
annotate libgsmfrp/bad_frame.c @ 242:f081a6850fb5
libgsmfrp: new refined implementation
The previous implementation exhibited the following defects,
which are now fixed:
1) The last received valid SID was cached forever for the purpose of
handling future invalid SIDs - we could have received some valid
SID ages ago, then lots of speech or NO_DATA, and if we then get
an invalid SID, we would resurrect the last valid SID from ancient
history - a bad design. In our new design, we handle invalid SID
based on the current state, much like BFI.
2) GSM 06.11 spec says clearly that after the second lost SID
(received BFI=1 && TAF=1 in CN state) we need to gradually decrease
the output level, rather than jump directly to emitting silence
frames - we previously failed to implement such logic.
3) Per GSM 06.12 section 5.2, Xmaxc should be the same in all 4 subframes
in a SID frame. What should we do if we receive an otherwise valid
SID frame with different Xmaxc? Our previous approach would
replicate this Xmaxc oddity in every subsequent generated CN frame,
which is rather bad. In our new design, the very first CN frame
(which can be seen as a transformation of the SID frame itself)
retains the original 4 distinct Xmaxc, but all subsequent CN frames
are based on the Xmaxc from the last subframe of the most recent SID.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 09 May 2023 05:16:31 +0000 |
parents | 2361a7d8c1eb |
children | 6ac547f0b903 |
rev | line source |
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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 switch (st->rx_state) { |
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98 case NO_DATA: |
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99 memcpy(frame, &gsmfr_preproc_silence_frame, sizeof(gsm_frame)); |
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100 return; |
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101 case SPEECH: |
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102 /* |
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103 * Make CN out of the last good speech frame, following the |
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104 * "NOTE" at the end of section 6.1.2 in TS 46.031. |
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105 */ |
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106 st->rx_state = COMFORT_NOISE; |
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107 memcpy(st->sid_prefix, &st->speech_frame, 5); |
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108 st->sid_xmaxc = ((st->speech_frame[27] & 0x1F) << 1) | |
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109 (st->speech_frame[28] >> 7); |
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110 gsmfr_preproc_gen_cn(st, frame); |
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111 return; |
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112 case SPEECH_MUTING: |
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113 /* same as above, but set the state to CN_MUTING */ |
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114 st->rx_state = CN_MUTING; |
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115 memcpy(st->sid_prefix, &st->speech_frame, 5); |
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116 st->sid_xmaxc = ((st->speech_frame[27] & 0x1F) << 1) | |
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117 (st->speech_frame[28] >> 7); |
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118 gsmfr_preproc_gen_cn(st, frame); |
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119 return; |
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120 case COMFORT_NOISE: |
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121 case LOST_SID: |
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122 st->rx_state = COMFORT_NOISE; |
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123 gsmfr_preproc_gen_cn(st, frame); |
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124 return; |
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125 case CN_MUTING: |
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126 if (reduce_xmaxc_sid(st)) { |
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127 st->rx_state = NO_DATA; |
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128 memcpy(frame, &gsmfr_preproc_silence_frame, |
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129 sizeof(gsm_frame)); |
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130 } else |
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131 gsmfr_preproc_gen_cn(st, frame); |
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132 return; |
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133 } |
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134 } |