FreeCalypso > hg > ice1-trau-tester

annotate ater8/tx_func.c @ 51:db39e8855f3d

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ater: implement play-d144
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 25 Sep 2024 05:53:38 +0000
parents 3cc26391d24d
children
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18
61862af2247f ater: E1 timeslot output (osmo_i460 mux)
Mychaela Falconia <falcon@freecalypso.org>
parents:
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * Here we are going to implement Tx on Ater toward the TRAU.
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Mychaela Falconia <falcon@freecalypso.org>
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3 */
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4
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5 #include <stdint.h>
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Mychaela Falconia <falcon@freecalypso.org>
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6 #include <stdbool.h>
61862af2247f ater: E1 timeslot output (osmo_i460 mux)
Mychaela Falconia <falcon@freecalypso.org>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <string.h>
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10 #include <unistd.h>
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11
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12 #include <osmocom/core/bits.h>
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13 #include <osmocom/core/msgb.h>
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14 #include <osmocom/core/select.h>
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Mychaela Falconia <falcon@freecalypso.org>
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15 #include <osmocom/isdn/i460_mux.h>
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237687e2be6c ater: implement play internals
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16 #include <osmocom/trau/trau_frame.h>
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17
61862af2247f ater: E1 timeslot output (osmo_i460 mux)
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18 #include "globals.h"
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Mychaela Falconia <falcon@freecalypso.org>
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19 #include "submux.h"
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237687e2be6c ater: implement play internals
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20 #include "out_frame.h"
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21
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3cc26391d24d ater8: add support for data mode
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22 /*
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23 * The following hard-coded frame is based on TS 48.061 section 5.2.2.
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24 * 1-based octet numbers in the comments are as in the spec.
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25 */
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26 static const ubit_t idle_data_frame[160] = {
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27 0, 0, 0, 0, 0, 0, 0, 0, /* octet 1 */
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28 1, 0, 0, 1, 1, 1, 1, 1, /* octet 2 */
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29 0, 1, 1, 1, 1, 1, 1, 1, /* octet 3 */
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30 1, 1, 1, 1, 1, 1, 1, 1, /* octet 4 */
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31 1, 1, 1, 1, 1, 1, 1, 1, /* octet 5 */
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32 1, 1, 1, 1, 1, 1, 1, 1, /* octet 6 */
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33 1, 1, 1, 1, 1, 1, 1, 1, /* octet 7 */
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34 1, 1, 1, 1, 1, 1, 1, 1, /* octet 8 */
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35 1, 1, 1, 1, 1, 1, 1, 1, /* octet 9 */
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36 1, 1, 1, 1, 1, 1, 1, 1, /* octet 10 */
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37 1, 1, 1, 1, 1, 1, 1, 1, /* octet 11 */
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38 1, 1, 1, 1, 1, 1, 1, 1, /* octet 12 */
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39 1, 1, 1, 1, 1, 1, 1, 1, /* octet 13 */
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40 1, 1, 1, 1, 1, 1, 1, 1, /* octet 14 */
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41 1, 1, 1, 1, 1, 1, 1, 1, /* octet 15 */
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42 1, 1, 1, 1, 1, 1, 1, 1, /* octet 16 */
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43 1, 1, 1, 1, 1, 1, 1, 1, /* octet 17 */
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44 1, 1, 1, 1, 1, 1, 1, 1, /* octet 18 */
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45 1, 1, 1, 1, 1, 1, 1, 1, /* octet 19 */
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46 1, 1, 1, 1, 1, 1, 1, 1, /* octet 20 */
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47 };
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48
19
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49 void init_trau_ul_frame(int nr)
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50 {
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51 struct ater_subslot *at = &subslots[nr];
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52 struct osmo_trau_frame *fr = &at->ul_frame;
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53
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54 fr->type = OSMO_TRAU8_SPEECH;
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55 fr->dir = OSMO_TRAU_DIR_UL;
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56 memset(fr->c_bits + 5, 1, 3);
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57 fr->xc_bits[0] = 0;
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58 memset(fr->t_bits, 1, 2);
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59 }
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60
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61 static void handle_play(struct ater_subslot *at)
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62 {
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63 if (at->play_wait_align) {
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64 if (at->mfrm_count)
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65 return;
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66 at->play_wait_align = false;
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67 }
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68 trau_frame_from_record(at->play_buffer + at->play_buf_ptr * 22,
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69 &at->ul_frame, &at->frame_has_taf);
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70 at->play_buf_ptr++;
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71 if (at->play_buf_ptr < at->play_buf_total)
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72 return;
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73 free(at->play_buffer);
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74 at->play_buffer = NULL;
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75 printf("file play finished\n");
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76 }
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77
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78 /* compute the odd parity bit of the given input bit sequence */
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79 static ubit_t compute_odd_parity(const ubit_t *in, unsigned int num_bits)
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80 {
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81 int i;
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82 unsigned int sum = 0;
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83
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84 for (i = 0; i < num_bits; i++) {
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85 if (in[i])
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86 sum++;
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87 }
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88
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89 if (sum & 1)
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90 return 0;
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91 else
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92 return 1;
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93 }
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94
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95 static void send_idle_data(int nr)
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96 {
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97 struct ater_subslot *at = &subslots[nr];
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98 struct msgb *msg;
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99
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100 msg = msgb_alloc_c(g_ctx, 160, "TRAU-UL-frame");
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101 if (!msg)
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102 return;
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103 memcpy(msg->tail, idle_data_frame, 160);
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104 msgb_put(msg, 160);
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105 osmo_i460_mux_enqueue(at->schan, msg);
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106 }
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107
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108 static void tx_service_subslot(int nr)
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109 {
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110 struct ater_subslot *at = &subslots[nr];
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111 struct osmo_trau_frame *fr = &at->ul_frame;
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112 ubit_t taf;
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113 struct msgb *msg;
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114 int len;
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115
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116 if (!at->is_active)
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117 return;
48
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118 if (at->is_data) {
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119 send_idle_data(nr);
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120 return;
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121 }
26
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122 if (at->play_buffer)
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123 handle_play(at);
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124 at->mfrm_count++;
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125 if (at->mfrm_count >= 12) {
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126 at->mfrm_count = 0;
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127 taf = 1;
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128 } else {
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129 taf = 0;
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130 }
42
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131 if (at->frame_has_taf)
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132 fr->xc_bits[3] = taf;
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133 fr->xc_bits[5] = compute_odd_parity(fr->xc_bits, 5);
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134
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135 msg = msgb_alloc_c(g_ctx, 320, "TRAU-UL-frame");
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136 if (!msg)
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137 return;
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138 len = osmo_trau_frame_encode(msg->tail, msgb_tailroom(msg), fr);
23
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139 if (len <= 0) {
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140 msgb_free(msg);
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141 return;
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142 }
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143 msgb_put(msg, len);
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144 osmo_i460_mux_enqueue(at->schan, msg);
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145 }
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146
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parents:
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147 void transmit_e1_ts(void)
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parents:
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148 {
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149 uint8_t buf[160];
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150 int nr;
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151
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152 for (nr = 0; nr < ATER_SUBSLOTS; nr++)
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153 tx_service_subslot(nr);
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154 osmo_i460_mux_out(&i460_ts, buf, 160);
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parents:
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155 write(ts_fd, buf, 160);
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156 }