FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/rtp.c @ 188:6aecee01cf0a

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sip-manual-out: add RTP stream continuity analysis
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Mar 2023 01:14:57 -0800
parents 258932879f8b
children 1266e024de6c
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1 /*
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2 * In this module we implement our RTP handling: obtaining a PSTN-side
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3 * RTP endpoint from themwi-rtp-mgr, then handling read select on RTP
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4 * and RTCP UDP sockets.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <sys/socket.h>
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9 #include <netinet/in.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.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 "../librtpalloc/rtp_alloc_simple.h"
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18
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19 struct sockaddr_in rtp_local_addr;
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20 int rtp_udp_fd, rtcp_udp_fd;
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21
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22 static int rtp_start_flag, rtp_bad_flag, rtp_ssrc_chg_flag;
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23 static int rtp_seq_brk_flag, rtp_seq_zero_flag, rtp_seq_neg_flag;
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24 static int rtp_ts_brk_flag;
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25 static uint32_t rtp_ssrc;
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26 static uint32_t rtp_last_ts;
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27 static uint16_t rtp_last_seq;
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28 static int got_some_rtcp;
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29
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30 void
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31 obtain_rtp_endp()
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32 {
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33 int rc;
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34 struct rtp_alloc_simple res;
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35
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36 rc = rtp_alloc_simple(TMGW_EP_TYPE_PSTN_ONLY, &res);
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37 if (rc < 0)
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38 exit(1); /* error msg already printed */
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39 bcopy(&res.pstn_addr, &rtp_local_addr, sizeof(struct sockaddr_in));
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40 rtp_udp_fd = res.pstn_rtp_fd;
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41 rtcp_udp_fd = res.pstn_rtcp_fd;
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42 }
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43
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44 void
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45 rtp_rx_select()
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46 {
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47 struct rtp_packet pkt;
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48 struct sockaddr_in sin_from;
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49 socklen_t addrlen;
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50 int16_t seq_delta;
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51 int32_t ts_delta;
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52 int rc;
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53
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54 addrlen = sizeof(struct sockaddr_in);
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55 rc = recvfrom(rtp_udp_fd, &pkt, sizeof pkt, 0,
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56 (struct sockaddr *) &sin_from, &addrlen);
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57 if (rc < 0)
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58 return;
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59 if (rc != RTP_PACKET_SIZE_PSTN) {
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60 bad_rtp_pkt: if (!rtp_bad_flag) {
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61 printf("Got a bad RTP packet\n");
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62 rtp_bad_flag = 1;
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63 }
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64 return;
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65 }
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66 if (pkt.v_p_x_cc != 0x80)
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67 goto bad_rtp_pkt;
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68 switch (pkt.m_pt & 0x7F) {
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69 case PSTN_CODEC_PCMU:
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70 case PSTN_CODEC_PCMA:
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71 break;
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72 default:
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73 goto bad_rtp_pkt;
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74 }
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75 if (rtp_start_flag && pkt.ssrc != rtp_ssrc) {
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76 if (!rtp_ssrc_chg_flag) {
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77 printf("Rx RTP stream changed SSRC\n");
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78 rtp_ssrc_chg_flag = 1;
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79 }
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80 } else if (rtp_start_flag) {
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81 seq_delta = ntohs(pkt.seq) - rtp_last_seq;
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82 ts_delta = ntohl(pkt.tstamp) - rtp_last_ts;
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83 if (seq_delta == 0) {
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84 if (!rtp_seq_zero_flag) {
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85 printf("Rx RTP seq zero increment\n");
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86 rtp_seq_zero_flag = 1;
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87 }
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88 return;
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89 }
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90 if (seq_delta < 0) {
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91 if (!rtp_seq_neg_flag) {
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92 printf("Rx RTP seq negative increment\n");
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93 rtp_seq_neg_flag = 1;
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94 }
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95 return;
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96 }
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97 if (seq_delta != 1) {
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98 if (!rtp_seq_brk_flag) {
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99 printf("Rx RTP stream seq break\n");
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100 rtp_seq_brk_flag = 1;
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101 }
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102 } else if (ts_delta != 160) {
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103 if (!rtp_ts_brk_flag) {
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104 printf("Rx RTP stream tstamp break\n");
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105 rtp_ts_brk_flag = 1;
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106 }
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107 }
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108 }
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109 rtp_ssrc = pkt.ssrc;
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110 rtp_last_ts = ntohl(pkt.tstamp);
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111 rtp_last_seq = ntohs(pkt.seq);
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112 if (!rtp_start_flag) {
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113 printf("Rx RTP stream begins with seq=%u ts=%u\n",
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114 rtp_last_seq, rtp_last_ts);
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115 rtp_start_flag = 1;
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116 }
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117 }
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118
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119 void
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120 rtcp_rx_select()
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121 {
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
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122 u_char buf[512];
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
Mychaela Falconia <falcon@freecalypso.org>
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123
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
Mychaela Falconia <falcon@freecalypso.org>
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124 recv(rtcp_udp_fd, buf, sizeof buf, 0);
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
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125 if (!got_some_rtcp) {
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
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126 printf("Got some RTCP\n");
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
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127 got_some_rtcp = 1;
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
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128 }
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129 }