FreeCalypso > hg > rtp-debug-utils

annotate net-traffic/rtp-stream-gen.c @ 14:e7f43262efa1

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rtp-stream-dump: add hex dump option
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 28 Jul 2024 01:53:41 +0000
parents e686bc92c7d8
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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8
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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2 * This program generates a dummy RTP stream, sending RTP packets with
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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3 * a dummy payload to the specified destination IP:port, paced in time
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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4 * every 20 ms. The purpose is to test the behaviour of affordably-available
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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5 * Internet connections when presented with such traffic: the intent is
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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6 * to capture this packet stream on the receiving end with tcpdump and then
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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7 * analyze the pcap for problem signs of packet loss, jitter and reordering.
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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8 */
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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9
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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10 #include <sys/types.h>
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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11 #include <sys/socket.h>
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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12 #include <sys/time.h>
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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13 #include <netinet/in.h>
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Mychaela Falconia <falcon@freecalypso.org>
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14 #include <arpa/inet.h>
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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15 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include <stdint.h>
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Mychaela Falconia <falcon@freecalypso.org>
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17 #include <stdlib.h>
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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18 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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19 #include <strings.h>
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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20 #include <unistd.h>
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Mychaela Falconia <falcon@freecalypso.org>
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21
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Mychaela Falconia <falcon@freecalypso.org>
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22 #define RTP_PACKET_HDR_SIZE 12
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Mychaela Falconia <falcon@freecalypso.org>
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23 #define RTP_MAX_PAYLOAD 160
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Mychaela Falconia <falcon@freecalypso.org>
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24 #define GSM_FR_BYTES 33
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Mychaela Falconia <falcon@freecalypso.org>
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25
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Mychaela Falconia <falcon@freecalypso.org>
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26 struct rtp_packet {
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Mychaela Falconia <falcon@freecalypso.org>
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27 uint8_t v_p_x_cc;
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Mychaela Falconia <falcon@freecalypso.org>
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28 uint8_t m_pt;
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Mychaela Falconia <falcon@freecalypso.org>
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29 uint16_t seq;
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Mychaela Falconia <falcon@freecalypso.org>
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30 uint32_t tstamp;
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Mychaela Falconia <falcon@freecalypso.org>
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31 uint32_t ssrc;
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Mychaela Falconia <falcon@freecalypso.org>
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32 uint8_t payload[RTP_MAX_PAYLOAD];
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Mychaela Falconia <falcon@freecalypso.org>
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33 };
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34
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Mychaela Falconia <falcon@freecalypso.org>
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35 static const uint8_t gsmfr_silence_frame[GSM_FR_BYTES] = {
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Mychaela Falconia <falcon@freecalypso.org>
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36 0xDA, 0xA7, 0xAA, 0xA5, 0x1A,
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Mychaela Falconia <falcon@freecalypso.org>
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37 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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38 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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39 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
d180987db615 new program rtp-stream-gen
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40 0x50, 0x20, 0x38, 0xE4, 0x6D, 0xB9, 0x1B,
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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41 };
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42
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Mychaela Falconia <falcon@freecalypso.org>
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43 static struct sockaddr_in sin_src, sin_dest;
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Mychaela Falconia <falcon@freecalypso.org>
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44 static struct rtp_packet rtp_pkt;
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Mychaela Falconia <falcon@freecalypso.org>
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45 static unsigned rtp_pkt_len, req_packet_count;
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Mychaela Falconia <falcon@freecalypso.org>
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46 static int udp_fd;
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Mychaela Falconia <falcon@freecalypso.org>
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47
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Mychaela Falconia <falcon@freecalypso.org>
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48 static void
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Mychaela Falconia <falcon@freecalypso.org>
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49 parse_ip_port(arg, sin)
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Mychaela Falconia <falcon@freecalypso.org>
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50 char *arg;
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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51 struct sockaddr_in *sin;
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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52 {
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Mychaela Falconia <falcon@freecalypso.org>
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53 char *cp;
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Mychaela Falconia <falcon@freecalypso.org>
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54 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
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55
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Mychaela Falconia <falcon@freecalypso.org>
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56 cp = index(arg, ':');
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Mychaela Falconia <falcon@freecalypso.org>
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57 if (!cp) {
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Mychaela Falconia <falcon@freecalypso.org>
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58 fprintf(stderr, "error: missing ':' in IP:port argument\n");
d180987db615 new program rtp-stream-gen
Mychaela Falconia <falcon@freecalypso.org>
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59 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
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61 *cp++ = '\0';
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Mychaela Falconia <falcon@freecalypso.org>
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62 sin->sin_family = AF_INET;
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Mychaela Falconia <falcon@freecalypso.org>
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63 rc = inet_aton(arg, &sin->sin_addr);
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Mychaela Falconia <falcon@freecalypso.org>
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64 if (!rc) {
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Mychaela Falconia <falcon@freecalypso.org>
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65 fprintf(stderr, "error: invalid IP address argument\n");
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Mychaela Falconia <falcon@freecalypso.org>
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66 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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67 }
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Mychaela Falconia <falcon@freecalypso.org>
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68 sin->sin_port = htons(atoi(cp));
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Mychaela Falconia <falcon@freecalypso.org>
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69 }
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70
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Mychaela Falconia <falcon@freecalypso.org>
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71 static void
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Mychaela Falconia <falcon@freecalypso.org>
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72 prepare_rtp_payload(type_arg)
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Mychaela Falconia <falcon@freecalypso.org>
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73 char *type_arg;
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Mychaela Falconia <falcon@freecalypso.org>
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74 {
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Mychaela Falconia <falcon@freecalypso.org>
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75 unsigned pl_len;
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Mychaela Falconia <falcon@freecalypso.org>
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76
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Mychaela Falconia <falcon@freecalypso.org>
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77 if (!strcmp(type_arg, "pcmu")) {
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Mychaela Falconia <falcon@freecalypso.org>
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78 rtp_pkt.m_pt = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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79 memset(rtp_pkt.payload, 0xFF, RTP_MAX_PAYLOAD);
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Mychaela Falconia <falcon@freecalypso.org>
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80 pl_len = RTP_MAX_PAYLOAD;
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Mychaela Falconia <falcon@freecalypso.org>
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81 } else if (!strcmp(type_arg, "pcma")) {
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Mychaela Falconia <falcon@freecalypso.org>
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82 rtp_pkt.m_pt = 8;
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Mychaela Falconia <falcon@freecalypso.org>
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83 memset(rtp_pkt.payload, 0xD5, RTP_MAX_PAYLOAD);
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Mychaela Falconia <falcon@freecalypso.org>
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84 pl_len = RTP_MAX_PAYLOAD;
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Mychaela Falconia <falcon@freecalypso.org>
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85 } else if (!strcmp(type_arg, "gsm")) {
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Mychaela Falconia <falcon@freecalypso.org>
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86 rtp_pkt.m_pt = 3;
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Mychaela Falconia <falcon@freecalypso.org>
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87 memcpy(rtp_pkt.payload, gsmfr_silence_frame, GSM_FR_BYTES);
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Mychaela Falconia <falcon@freecalypso.org>
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88 pl_len = GSM_FR_BYTES;
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89 } else {
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90 fprintf(stderr, "error: invalid PL type argument \"%s\"\n",
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Mychaela Falconia <falcon@freecalypso.org>
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91 type_arg);
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92 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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93 }
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Mychaela Falconia <falcon@freecalypso.org>
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94 rtp_pkt_len = RTP_PACKET_HDR_SIZE + pl_len;
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Mychaela Falconia <falcon@freecalypso.org>
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95 }
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96
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97 static void
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Mychaela Falconia <falcon@freecalypso.org>
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98 assign_rtpout_ssrc()
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Mychaela Falconia <falcon@freecalypso.org>
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99 {
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Mychaela Falconia <falcon@freecalypso.org>
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100 struct timeval curtime;
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101
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Mychaela Falconia <falcon@freecalypso.org>
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102 gettimeofday(&curtime, 0);
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Mychaela Falconia <falcon@freecalypso.org>
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103 rtp_pkt.ssrc = curtime.tv_sec ^ curtime.tv_usec ^ getpid();
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104 }
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105
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106 static void
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Mychaela Falconia <falcon@freecalypso.org>
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107 prepare_udp_socket()
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108 {
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109 int rc;
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110
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111 udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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Mychaela Falconia <falcon@freecalypso.org>
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112 if (udp_fd < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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113 perror("socket(AF_INET, SOCK_DGRAM, 0)");
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114 exit(1);
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115 }
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Mychaela Falconia <falcon@freecalypso.org>
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116 rc = bind(udp_fd, (struct sockaddr *) &sin_src, sizeof sin_src);
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117 if (rc < 0) {
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118 perror("bind");
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119 exit(1);
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120 }
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Mychaela Falconia <falcon@freecalypso.org>
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121 rc = connect(udp_fd, (struct sockaddr *) &sin_dest, sizeof sin_dest);
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Mychaela Falconia <falcon@freecalypso.org>
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122 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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123 perror("connect");
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124 exit(1);
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Mychaela Falconia <falcon@freecalypso.org>
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125 }
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Mychaela Falconia <falcon@freecalypso.org>
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126 }
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127
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128 static void
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Mychaela Falconia <falcon@freecalypso.org>
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129 send_out_packets()
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130 {
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Mychaela Falconia <falcon@freecalypso.org>
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131 unsigned n, seq, ts;
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132
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Mychaela Falconia <falcon@freecalypso.org>
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133 seq = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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134 ts = 0;
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Mychaela Falconia <falcon@freecalypso.org>
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135 for (n = 0; n < req_packet_count; n++) {
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Mychaela Falconia <falcon@freecalypso.org>
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136 rtp_pkt.seq = htons(seq);
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Mychaela Falconia <falcon@freecalypso.org>
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137 rtp_pkt.tstamp = htonl(ts);
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Mychaela Falconia <falcon@freecalypso.org>
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138 send(udp_fd, &rtp_pkt, rtp_pkt_len, 0);
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Mychaela Falconia <falcon@freecalypso.org>
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139 seq++;
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Mychaela Falconia <falcon@freecalypso.org>
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140 ts += 160;
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Mychaela Falconia <falcon@freecalypso.org>
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141 usleep(20000);
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Mychaela Falconia <falcon@freecalypso.org>
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142 }
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Mychaela Falconia <falcon@freecalypso.org>
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143 }
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144
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145 main(argc, argv)
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146 char **argv;
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147 {
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148 if (argc != 5) {
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149 fprintf(stderr, "usage: %s src-IP:port dest-IP:port type num\n",
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150 argv[0]);
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151 exit(1);
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152 }
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153 parse_ip_port(argv[1], &sin_src);
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154 parse_ip_port(argv[2], &sin_dest);
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155 prepare_rtp_payload(argv[3]);
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156 rtp_pkt.v_p_x_cc = 0x80;
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157 assign_rtpout_ssrc();
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158 req_packet_count = atoi(argv[4]);
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159 prepare_udp_socket();
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160 send_out_packets();
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161 exit(0);
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162 }