FreeCalypso > hg > gsm-codec-lib

annotate pcap/rtp-jitter-view.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 693a0958a303
children 10f11a2d4042
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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
171
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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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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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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 fprintf(stderr,
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85 "error in packet #%u: seq break from 0x%04X to 0x%04X\n",
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86 pkt_idx, last_seq, cur_seq);
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87 exit(1);
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88 }
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89 if (cur_tstamp != last_tstamp + 160) {
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90 fprintf(stderr,
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91 "error in packet #%u: timestamp break from 0x%08X to 0x%08X\n",
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92 pkt_idx, last_tstamp, cur_tstamp);
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93 exit(1);
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94 }
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95 if (timercmp(pkt_time, &last_pkt_time, <)) {
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96 fprintf(stderr,
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97 "packet #%u timing error: Rx time goes backward\n",
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98 pkt_idx);
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99 exit(1);
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100 }
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101 timersub(pkt_time, &last_pkt_time, &deltat);
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102 if (deltat.tv_sec) {
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103 fprintf(stderr,
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104 "packet #%u timing error: Rx time gap >= 1 s\n",
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105 pkt_idx);
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106 exit(1);
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107 }
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108 printf("Packet #%u: time delta %u us\n", pkt_idx,
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109 (unsigned) deltat.tv_usec);
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110 } else {
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111 stream_init_flag = 1;
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112 stream_ssrc = cur_ssrc;
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113 }
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114 last_seq = cur_seq;
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115 last_tstamp = cur_tstamp;
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116 bcopy(pkt_time, &last_pkt_time, sizeof(struct timeval));
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117 }
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118
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119 static void
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120 process_packet(pkt, caplen, pkt_idx, pkt_time)
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121 u_char *pkt;
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122 unsigned caplen, pkt_idx;
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123 struct timeval *pkt_time;
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124 {
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125 unsigned udplen;
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126
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 if (caplen < link_hdr_len + 28)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 if (link_hdr_len) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 if (pkt[ethertype_offset] != 0x08)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 if (pkt[ethertype_offset+1] != 0x00)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 pkt += link_hdr_len;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 caplen -= link_hdr_len;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 /* check IP header */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (pkt[0] != 0x45)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 if (pkt[9] != 17) /* UDP */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 if (bcmp(pkt + iphdr_addr_offset, &match_ip_addr, 4))
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 /* check UDP header */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 if (bcmp(pkt + 20 + udphdr_port_offset, &match_udp_port, 2))
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 /* it is our target - now scrutinize it */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 udplen = (pkt[24] << 8) | pkt[25];
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 if (caplen < udplen + 20) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 "error: packet #%u is truncated in the capture\n",
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 pkt_idx);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 if (udplen < 20) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 "error in packet #%u: UDP length is too short for RTP header\n",
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 pkt_idx);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 if (pkt[28] != 0x80) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 "error in packet #%u: unsupported RTP header structure\n",
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 pkt_idx);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 }
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
167 rtp_stream_logic(pkt + 28, pkt_idx, pkt_time);
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 main(argc, argv)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 char **argv;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 char errbuf[PCAP_ERRBUF_SIZE];
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 u_char *pkt;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 struct pcap_pkthdr pkthdr;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 unsigned pkt_idx;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
178 if (argc != 5) {
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 fprintf(stderr,
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
180 "usage: %s pcap-file src|dest ip-addr udp-port\n",
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 argv[0]);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 pcap = pcap_open_offline(argv[1], errbuf);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 if (!pcap) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 fprintf(stderr, "%s: %s\n", argv[1], errbuf);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 check_dl_type();
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 if (!strcmp(argv[2], "src")) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 iphdr_addr_offset = 12;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 udphdr_port_offset = 0;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 } else if (!strcmp(argv[2], "dest")) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 iphdr_addr_offset = 16;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 udphdr_port_offset = 2;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 } else {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 "error: direction argument must be \"src\" or \"dest\"\n");
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 match_ip_addr = inet_addr(argv[3]);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 if (match_ip_addr == INADDR_NONE) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 fprintf(stderr, "error: IP address argument is invalid\n");
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 match_udp_port = htons(strtoul(argv[4], 0, 0));
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 for (pkt_idx = 0; ; pkt_idx++) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 pkt = pcap_next(pcap, &pkthdr);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 if (!pkt)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 break;
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
211 process_packet(pkt, (unsigned) pkthdr.caplen, pkt_idx,
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
212 &pkthdr.ts);
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 if (!stream_init_flag) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 fprintf(stderr, "error: specified RTP stream not found\n");
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 exit(0);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 }