FreeCalypso > hg > rtp-debug-utils

annotate pcap-study/rtp-jitter-view.c @ 17:ab18adf989e3 default tip

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pcm-study: new program pcm16-frag-extr
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 29 Oct 2024 00:32:33 +0000
parents e686bc92c7d8
children
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1 /*
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2 * This program reads a pcap file, extracts packets belonging to a
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3 * particular RTP stream as identified by a source or destination
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4 * IP:port, checks its continuity at the packet header level
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5 * (verifies that the sequence number always increments by 1 and
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6 * that the timestamp always increments by 160 units) and prints out
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7 * the Rx time delta of each stream packet (the capture time of
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8 * the current packet minus the capture time of the previous packet)
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9 * on stdout, allowing visual analysis of timing jitter.
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10 *
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11 * The codec can be anything, and this program can also be used to
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12 * examine the jitter of RTP streams coming from PSTN/SIP, but the
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13 * core assumption is that packets must arrive every 20 ms, with
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14 * the timestamp field incrementing by 160 units each time.
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15 */
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16
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17 #include <sys/types.h>
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18 #include <sys/socket.h>
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19 #include <sys/time.h>
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20 #include <netinet/in.h>
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21 #include <arpa/inet.h>
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22 #include <stdio.h>
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23 #include <stdlib.h>
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24 #include <string.h>
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25 #include <strings.h>
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26 #include <pcap/pcap.h>
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27
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28 static pcap_t *pcap;
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29 static in_addr_t match_ip_addr;
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30 static u_short match_udp_port;
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31 static unsigned iphdr_addr_offset, udphdr_port_offset;
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32 static unsigned link_hdr_len, ethertype_offset;
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33 static int stream_init_flag;
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34 static unsigned last_seq, last_tstamp, stream_ssrc;
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35 static struct timeval last_pkt_time;
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36
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37 static void
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38 check_dl_type()
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39 {
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40 int dltype;
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41
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42 dltype = pcap_datalink(pcap);
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43 switch (dltype) {
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44 case DLT_EN10MB:
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45 link_hdr_len = 14;
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46 ethertype_offset = 12;
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47 break;
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48 case DLT_RAW:
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49 link_hdr_len = 0;
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50 break;
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51 case DLT_LINUX_SLL:
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52 link_hdr_len = 16;
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53 ethertype_offset = 14;
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54 break;
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55 default:
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56 fprintf(stderr, "error: unsupported data link type %d\n",
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57 dltype);
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58 exit(1);
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59 }
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60 }
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61
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62 static void
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63 rtp_stream_logic(rtp_hdr, pkt_idx, pkt_time)
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64 u_char *rtp_hdr;
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65 unsigned pkt_idx;
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66 struct timeval *pkt_time;
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67 {
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68 unsigned cur_seq, cur_tstamp, cur_ssrc;
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69 struct timeval deltat;
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70
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71 cur_seq = (rtp_hdr[2] << 8) | rtp_hdr[3];
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72 cur_tstamp = (rtp_hdr[4] << 24) | (rtp_hdr[5] << 16) |
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73 (rtp_hdr[6] << 8) | rtp_hdr[7];
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74 cur_ssrc = (rtp_hdr[8] << 24) | (rtp_hdr[9] << 16) |
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75 (rtp_hdr[10] << 8) | rtp_hdr[11];
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76 if (stream_init_flag) {
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77 if (cur_ssrc != stream_ssrc) {
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78 fprintf(stderr,
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79 "error in packet #%u: SSRC change from 0x%08X to 0x%08X\n",
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80 pkt_idx, stream_ssrc, cur_ssrc);
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81 exit(1);
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82 }
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83 if (cur_seq != last_seq + 1 &&
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84 (cur_seq != 0 || last_seq != 0xFFFF)) {
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85 fprintf(stderr,
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86 "error in packet #%u: seq break from 0x%04X to 0x%04X\n",
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87 pkt_idx, last_seq, cur_seq);
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88 exit(1);
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89 }
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90 if (cur_tstamp != last_tstamp + 160) {
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91 fprintf(stderr,
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92 "error in packet #%u: timestamp break from 0x%08X to 0x%08X\n",
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93 pkt_idx, last_tstamp, cur_tstamp);
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94 exit(1);
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95 }
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96 if (timercmp(pkt_time, &last_pkt_time, <)) {
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97 fprintf(stderr,
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98 "packet #%u timing error: Rx time goes backward\n",
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99 pkt_idx);
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100 exit(1);
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101 }
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102 timersub(pkt_time, &last_pkt_time, &deltat);
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103 if (deltat.tv_sec) {
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104 fprintf(stderr,
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105 "packet #%u timing error: Rx time gap >= 1 s\n",
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106 pkt_idx);
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107 exit(1);
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108 }
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109 printf("Packet #%u: time delta %u us\n", pkt_idx,
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110 (unsigned) deltat.tv_usec);
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111 } else {
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112 stream_init_flag = 1;
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113 stream_ssrc = cur_ssrc;
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114 }
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115 last_seq = cur_seq;
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116 last_tstamp = cur_tstamp;
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117 bcopy(pkt_time, &last_pkt_time, sizeof(struct timeval));
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118 }
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119
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120 static void
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121 process_packet(pkt, caplen, pkt_idx, pkt_time)
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122 u_char *pkt;
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123 unsigned caplen, pkt_idx;
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124 struct timeval *pkt_time;
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125 {
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126 unsigned udplen;
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127
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128 if (caplen < link_hdr_len + 28)
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129 return;
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130 if (link_hdr_len) {
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131 if (pkt[ethertype_offset] != 0x08)
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parents:
diff changeset
132 return;
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parents:
diff changeset
133 if (pkt[ethertype_offset+1] != 0x00)
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parents:
diff changeset
134 return;
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parents:
diff changeset
135 pkt += link_hdr_len;
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parents:
diff changeset
136 caplen -= link_hdr_len;
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parents:
diff changeset
137 }
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parents:
diff changeset
138 /* check IP header */
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parents:
diff changeset
139 if (pkt[0] != 0x45)
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parents:
diff changeset
140 return;
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parents:
diff changeset
141 if (pkt[9] != 17) /* UDP */
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parents:
diff changeset
142 return;
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parents:
diff changeset
143 if (bcmp(pkt + iphdr_addr_offset, &match_ip_addr, 4))
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parents:
diff changeset
144 return;
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parents:
diff changeset
145 /* check UDP header */
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parents:
diff changeset
146 if (bcmp(pkt + 20 + udphdr_port_offset, &match_udp_port, 2))
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parents:
diff changeset
147 return;
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parents:
diff changeset
148 /* it is our target - now scrutinize it */
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diff changeset
149 udplen = (pkt[24] << 8) | pkt[25];
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parents:
diff changeset
150 if (caplen < udplen + 20) {
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parents:
diff changeset
151 fprintf(stderr,
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parents:
diff changeset
152 "error: packet #%u is truncated in the capture\n",
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diff changeset
153 pkt_idx);
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parents:
diff changeset
154 exit(1);
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parents:
diff changeset
155 }
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parents:
diff changeset
156 if (udplen < 20) {
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parents:
diff changeset
157 fprintf(stderr,
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parents:
diff changeset
158 "error in packet #%u: UDP length is too short for RTP header\n",
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parents:
diff changeset
159 pkt_idx);
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parents:
diff changeset
160 exit(1);
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parents:
diff changeset
161 }
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parents:
diff changeset
162 if (pkt[28] != 0x80) {
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parents:
diff changeset
163 fprintf(stderr,
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
164 "error in packet #%u: unsupported RTP header structure\n",
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parents:
diff changeset
165 pkt_idx);
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parents:
diff changeset
166 exit(1);
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parents:
diff changeset
167 }
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parents:
diff changeset
168 rtp_stream_logic(pkt + 28, pkt_idx, pkt_time);
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diff changeset
169 }
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diff changeset
170
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diff changeset
171 main(argc, argv)
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diff changeset
172 char **argv;
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diff changeset
173 {
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diff changeset
174 char errbuf[PCAP_ERRBUF_SIZE];
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diff changeset
175 u_char *pkt;
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diff changeset
176 struct pcap_pkthdr pkthdr;
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parents:
diff changeset
177 unsigned pkt_idx;
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parents:
diff changeset
178
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diff changeset
179 if (argc != 5) {
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parents:
diff changeset
180 fprintf(stderr,
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diff changeset
181 "usage: %s pcap-file src|dest ip-addr udp-port\n",
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parents:
diff changeset
182 argv[0]);
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parents:
diff changeset
183 exit(1);
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diff changeset
184 }
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diff changeset
185 pcap = pcap_open_offline(argv[1], errbuf);
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parents:
diff changeset
186 if (!pcap) {
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parents:
diff changeset
187 fprintf(stderr, "%s: %s\n", argv[1], errbuf);
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diff changeset
188 exit(1);
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diff changeset
189 }
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diff changeset
190 check_dl_type();
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parents:
diff changeset
191 if (!strcmp(argv[2], "src")) {
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diff changeset
192 iphdr_addr_offset = 12;
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diff changeset
193 udphdr_port_offset = 0;
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diff changeset
194 } else if (!strcmp(argv[2], "dest")) {
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diff changeset
195 iphdr_addr_offset = 16;
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diff changeset
196 udphdr_port_offset = 2;
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parents:
diff changeset
197 } else {
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parents:
diff changeset
198 fprintf(stderr,
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parents:
diff changeset
199 "error: direction argument must be \"src\" or \"dest\"\n");
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parents:
diff changeset
200 exit(1);
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parents:
diff changeset
201 }
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parents:
diff changeset
202 match_ip_addr = inet_addr(argv[3]);
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parents:
diff changeset
203 if (match_ip_addr == INADDR_NONE) {
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parents:
diff changeset
204 fprintf(stderr, "error: IP address argument is invalid\n");
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parents:
diff changeset
205 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 match_udp_port = htons(strtoul(argv[4], 0, 0));
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parents:
diff changeset
208 for (pkt_idx = 0; ; pkt_idx++) {
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parents:
diff changeset
209 pkt = pcap_next(pcap, &pkthdr);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 if (!pkt)
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 process_packet(pkt, (unsigned) pkthdr.caplen, pkt_idx,
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parents:
diff changeset
213 &pkthdr.ts);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 if (!stream_init_flag) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 fprintf(stderr, "error: specified RTP stream not found\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 exit(0);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
220 }