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1 /*
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2 * SpanDSP - a series of DSP components for telephony
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3 *
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4 * ip_network_model.c - Model an IP networks latency, jitter and loss.
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5 *
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6 * Written by Steve Underwood <steveu@coppice.org>
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7 *
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8 * Copyright (C) 2006 Steve Underwood
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9 *
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10 * All rights reserved.
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11 *
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12 * This program is free software; you can redistribute it and/or modify
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13 * it under the terms of the GNU General Public License version 2, as
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14 * published by the Free Software Foundation.
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15 *
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16 * This program is distributed in the hope that it will be useful,
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17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 * GNU General Public License for more details.
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20 *
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21 * You should have received a copy of the GNU General Public License
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22 * along with this program; if not, write to the Free Software
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23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 *
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25 * $Id: ip_network_model.c,v 1.4 2006/11/19 14:07:27 steveu Exp $
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26 */
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27
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28 #ifdef HAVE_CONFIG_H
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29 #include "config.h"
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30 #endif
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31
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32 #include <stdlib.h>
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33 #include <unistd.h>
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34 #include <inttypes.h>
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35 #include <string.h>
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36 #include <time.h>
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37 #include <stdio.h>
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38 #include <fcntl.h>
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39 #include <audiofile.h>
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40 #include <tiffio.h>
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41 #if defined(HAVE_TGMATH_H)
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42 #include <tgmath.h>
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43 #endif
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44 #if defined(HAVE_MATH_H)
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45 #define GEN_CONST
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46 #include <math.h>
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47 #endif
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48
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49 #include "spandsp.h"
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50
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51 #include "ip_network_model.h"
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52
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53 #if !defined(NULL)
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54 #define NULL (void *) 0
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55 #endif
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56
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57 void ip_network_model_send(ip_network_model_state_t *s,
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58 int seq_no,
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59 int count,
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60 const uint8_t *buf,
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61 int len)
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62 {
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63 int delay[2];
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64 int i;
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65
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66 for (i = 0; i < count; i++)
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67 {
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68 if (rand()%1000000 >= s->packet_loss)
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69 {
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70 delay[0] = s->current_samples + s->bulk_delay + (rand()%s->jitter);
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71 delay[1] = seq_no;
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72 queue_write_msg(&s->packet_queue, (uint8_t *) delay, sizeof(delay));
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73 queue_write_msg(&s->packet_queue, buf, len);
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74 }
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75 else
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76 {
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77 fprintf(stderr, "Dropping packet - seq %d\n", seq_no);
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78 }
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79 }
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80 }
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81 /*- End of function --------------------------------------------------------*/
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82
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83 int ip_network_model_get(ip_network_model_state_t *s,
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84 int time_step,
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85 uint8_t *msg,
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86 int max_len,
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87 int *seq_no)
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88 {
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89 int len;
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90
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91 s->current_samples += time_step;
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92
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93 if (s->delay[0] < 0)
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94 {
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95 /* Wait for a new packet */
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96 if (queue_empty(&s->packet_queue))
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97 return -1;
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98 len = queue_read_msg(&s->packet_queue, (uint8_t *) s->delay, sizeof(s->delay));
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99 if (len != sizeof(s->delay))
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100 return -1;
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101 }
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102 *seq_no = s->delay[1];
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103 /* Wait for the appropriate time */
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104 if (s->delay[0] > s->current_samples)
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105 return -1;
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106 /* Wait for a message */
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107 if (queue_empty(&s->packet_queue))
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108 return -1;
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109 s->delay[0] = -1;
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110 s->delay[1] = -1;
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111 len = queue_read_msg(&s->packet_queue, msg, max_len);
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112 return len;
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113 }
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114 /*- End of function --------------------------------------------------------*/
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115
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116 ip_network_model_state_t *ip_network_model_init(int bulk_delay,
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117 int jitter,
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118 int loss)
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119 {
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120 ip_network_model_state_t *s;
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121
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122 if ((s = (ip_network_model_state_t *) malloc(sizeof(*s))) == NULL)
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123 return NULL;
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124 memset(s, 0, sizeof(*s));
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125
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126 s->bulk_delay = bulk_delay;
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127 s->jitter = jitter;
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128 s->packet_loss = loss;
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129
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130 s->delay[0] = -1;
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131 s->delay[1] = -1;
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132
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133 if (queue_create(&s->packet_queue, 32768, QUEUE_WRITE_ATOMIC | QUEUE_READ_ATOMIC) < 0)
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134 {
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135 free(s);
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136 return NULL;
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137 }
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138 return s;
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139 }
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140 /*- End of function --------------------------------------------------------*/
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141
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142 int ip_network_model_release(ip_network_model_state_t *s)
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143 {
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144 queue_delete(&s->packet_queue);
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145 free(s);
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146 return 0;
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147 }
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148 /*- End of function --------------------------------------------------------*/
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149 /*- End of file ------------------------------------------------------------*/
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