FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/pp_bad.c @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 573afa985df6
children 405a84110997
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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 return;
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63 case SPEECH:
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64 memcpy(frame, &st->speech_frame, GSMFR_RTP_FRAME_LEN);
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65 st->rx_state = SPEECH_MUTING;
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66 return;
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67 case SPEECH_MUTING:
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68 mute = reduce_xmaxc(st->speech_frame);
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69 memcpy(frame, &st->speech_frame, GSMFR_RTP_FRAME_LEN);
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70 random_grid_pos(st, frame);
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71 if (mute)
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72 st->rx_state = NO_DATA;
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73 return;
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74 case COMFORT_NOISE:
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75 if (taf)
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76 st->rx_state = LOST_SID;
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77 gsmfr_preproc_gen_cn(st, frame);
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78 return;
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79 case LOST_SID:
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80 if (taf) {
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81 st->rx_state = CN_MUTING;
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82 reduce_xmaxc_sid(st);
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83 }
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84 gsmfr_preproc_gen_cn(st, frame);
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85 return;
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86 case CN_MUTING:
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87 if (reduce_xmaxc_sid(st)) {
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88 st->rx_state = NO_DATA;
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89 memcpy(frame, &gsmfr_preproc_silence_frame,
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90 GSMFR_RTP_FRAME_LEN);
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91 } else
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92 gsmfr_preproc_gen_cn(st, frame);
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93 return;
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94 }
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95 }
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96
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97 void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *st, uint8_t *frame)
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98 {
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99 int mute;
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100
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101 switch (st->rx_state) {
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102 case NO_DATA:
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103 memcpy(frame, &gsmfr_preproc_silence_frame,
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104 GSMFR_RTP_FRAME_LEN);
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105 return;
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106 case SPEECH:
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107 /*
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108 * Make CN out of the last good speech frame, following the
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109 * "NOTE" at the end of section 6.1.2 in TS 46.031.
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110 */
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111 st->rx_state = COMFORT_NOISE;
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112 memcpy(st->sid_prefix, &st->speech_frame, 5);
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113 st->sid_xmaxc = gsmfr_preproc_xmaxc_mean(st->speech_frame);
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114 gsmfr_preproc_gen_cn(st, frame);
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115 return;
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116 case SPEECH_MUTING:
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117 /* ignore invalid SID in this state and act as if we got BFI */
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118 mute = reduce_xmaxc(st->speech_frame);
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119 memcpy(frame, &st->speech_frame, GSMFR_RTP_FRAME_LEN);
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120 random_grid_pos(st, frame);
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121 if (mute)
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122 st->rx_state = NO_DATA;
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123 return;
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124 case COMFORT_NOISE:
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125 case LOST_SID:
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126 st->rx_state = COMFORT_NOISE;
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127 gsmfr_preproc_gen_cn(st, frame);
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128 return;
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129 case CN_MUTING:
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130 if (reduce_xmaxc_sid(st)) {
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131 st->rx_state = NO_DATA;
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132 memcpy(frame, &gsmfr_preproc_silence_frame,
256
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133 GSMFR_RTP_FRAME_LEN);
242
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134 } else
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135 gsmfr_preproc_gen_cn(st, frame);
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136 return;
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137 }
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138 }