FreeCalypso > hg > sipout-test-utils

annotate test-voice/rtp_tx.c @ 7:6d832abad660

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test-fsk: gather and print full line of modem Rx characters
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 05 Mar 2024 10:57:45 -0800
parents 35c0d9f03c0a
children 059b79c9f0c3
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0
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1 /*
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2 * In this module we implement outgoing RTP stream generation.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <sys/time.h>
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <unistd.h>
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15 #include "../include/tmgw_const.h"
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16 #include "../include/rtp_defs.h"
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17 #include "../libutil/osmo_bits.h"
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18
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19 extern struct sockaddr_in rtp_local_addr, rtp_remote_addr;
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20 extern int rtp_udp_fd, rtcp_udp_fd, pcma_selected;
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21 extern struct timeval cur_event_time;
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22
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23 static uint32_t rtp_ssrc;
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24 static uint32_t rtp_out_ts;
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25 static uint16_t rtp_out_seq;
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26
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27 static uint8_t pcm_fill_octet;
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28
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29 static uint16_t tfo_fill_buf[9], tfo_req_buf[7];
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30 static uint16_t *is_out_ptr;
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31 static unsigned is_out_count;
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32 static int tfo_stop_req;
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33
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34 void
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35 assign_rtpout_ssrc()
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36 {
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37 rtp_ssrc = cur_event_time.tv_sec ^ cur_event_time.tv_usec ^ getpid();
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38 }
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39
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40 void
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41 init_pcm_fill_octet()
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42 {
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43 if (pcma_selected)
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44 pcm_fill_octet = 0xD5;
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45 else
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46 pcm_fill_octet = 0xFF;
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47 }
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48
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49 void
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50 prepare_tfo_fill()
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51 {
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52 tfo_fill_buf[0] = 0x15A;
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53 tfo_fill_buf[1] = 0x1A9;
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54 tfo_fill_buf[2] = 0x129;
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55 tfo_fill_buf[3] = 0x15A;
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56 tfo_fill_buf[4] = 0x1A9;
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57 tfo_fill_buf[5] = 0x129;
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58 tfo_fill_buf[6] = 0x15A;
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59 tfo_fill_buf[7] = 0x1A9;
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60 tfo_fill_buf[8] = 0x129;
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61 }
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62
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63 static void
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64 insert_is_msg(payload, word)
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65 uint8_t *payload;
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66 uint16_t word;
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67 {
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68 ubit_t is_bits[10];
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69 uint8_t *bytep;
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70 unsigned n;
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71
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72 uint16_to_bits(word, is_bits, 10);
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73 for (n = 0; n < 10; n++) {
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74 bytep = payload + n * 16;
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75 *bytep &= 0xFE;
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76 *bytep |= is_bits[n];
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77 }
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78 }
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79
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80 void
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81 generate_rtp_packet()
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82 {
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83 struct rtp_packet pkt;
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84 socklen_t addrlen;
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85
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86 pkt.v_p_x_cc = 0x80;
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87 pkt.m_pt = pcma_selected ? PSTN_CODEC_PCMA : PSTN_CODEC_PCMU;
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88 pkt.seq = htons(rtp_out_seq++);
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89 pkt.tstamp = htonl(rtp_out_ts);
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90 rtp_out_ts += 160;
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91 pkt.ssrc = rtp_ssrc;
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92 memset(pkt.payload, pcm_fill_octet, RTP_MAX_PAYLOAD);
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93 if (is_out_count) {
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94 insert_is_msg(pkt.payload, *is_out_ptr++);
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95 is_out_count--;
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96 if (!is_out_count && !tfo_stop_req) {
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97 is_out_ptr = tfo_req_buf;
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98 is_out_count = 7;
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99 }
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100 }
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101 addrlen = sizeof(struct sockaddr_in);
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102 sendto(rtp_udp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
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103 (struct sockaddr *) &rtp_remote_addr, addrlen);
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104 }
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105
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106 void
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107 set_pcm_fill_octet(oct)
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108 unsigned oct;
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109 {
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110 pcm_fill_octet = oct;
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111 }
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112
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113 void
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114 send_tfo_req(sig, codec)
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115 unsigned sig, codec;
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116 {
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117 tfo_req_buf[0] = 0x15A;
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118 tfo_req_buf[1] = 0x1A9;
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119 tfo_req_buf[2] = 0x05D;
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120 tfo_req_buf[3] = 0x14E;
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121 tfo_req_buf[4] = 0x14B;
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122 encode_tfo_ext_words(sig, codec, 0, tfo_req_buf + 5);
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123 is_out_ptr = tfo_fill_buf;
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124 is_out_count = 9;
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125 tfo_stop_req = 0;
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126 }
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127
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128 void
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129 stop_tfo_out()
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130 {
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131 tfo_stop_req = 1;
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132 }