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annotate sip-manual-out/rtp.c @ 189:1266e024de6c

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sip-manual-out: implement hunt for IS_Header in Rx RTP
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Mar 2023 09:54:22 -0800
parents 6aecee01cf0a
children 62ecc0aa081f
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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
188
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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 static const uint8_t hdr_pattern[20] = {0, 1, 0, 1, 0, 1, 1, 0, 1, 0,
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31 0, 1, 1, 0, 1, 0, 1, 0, 0, 1};
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32
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33 static uint8_t is_hunt_buf[320];
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34
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35 static void
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36 reset_is_hunt()
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37 {
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38 memset(is_hunt_buf, 0xFF, 320);
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39 }
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40
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41 static void
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42 is_hunt_proc(input, input_pos)
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43 uint8_t *input;
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44 unsigned input_pos;
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45 {
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46 unsigned offset, n;
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47
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48 memmove(is_hunt_buf, is_hunt_buf + 16, 304);
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49 memcpy(is_hunt_buf + 304, input, 16);
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50 for (offset = 0; offset < 16; offset++) {
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51 for (n = 0; n < 20; n++)
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52 if ((is_hunt_buf[offset + n*16] & 1) != hdr_pattern[n])
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53 break;
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54 if (n == 20)
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55 break;
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56 }
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57 if (n == 20)
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58 printf("Found IS_Header, last bit offset %u\n",
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59 input_pos * 16 + offset);
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60 }
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61
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62 void
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63 obtain_rtp_endp()
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64 {
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65 int rc;
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66 struct rtp_alloc_simple res;
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67
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68 rc = rtp_alloc_simple(TMGW_EP_TYPE_PSTN_ONLY, &res);
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69 if (rc < 0)
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70 exit(1); /* error msg already printed */
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71 bcopy(&res.pstn_addr, &rtp_local_addr, sizeof(struct sockaddr_in));
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72 rtp_udp_fd = res.pstn_rtp_fd;
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73 rtcp_udp_fd = res.pstn_rtcp_fd;
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74 reset_is_hunt();
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75 }
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76
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77 void
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78 rtp_rx_select()
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79 {
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80 struct rtp_packet pkt;
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81 struct sockaddr_in sin_from;
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82 socklen_t addrlen;
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83 int16_t seq_delta;
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84 int32_t ts_delta;
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85 int rc;
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86 unsigned is_chunk;
187
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87
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88 addrlen = sizeof(struct sockaddr_in);
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89 rc = recvfrom(rtp_udp_fd, &pkt, sizeof pkt, 0,
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90 (struct sockaddr *) &sin_from, &addrlen);
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91 if (rc < 0)
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92 return;
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93 if (rc != RTP_PACKET_SIZE_PSTN) {
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94 bad_rtp_pkt: if (!rtp_bad_flag) {
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95 printf("Got a bad RTP packet\n");
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96 rtp_bad_flag = 1;
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97 }
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98 return;
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99 }
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100 if (pkt.v_p_x_cc != 0x80)
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101 goto bad_rtp_pkt;
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102 switch (pkt.m_pt & 0x7F) {
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103 case PSTN_CODEC_PCMU:
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104 case PSTN_CODEC_PCMA:
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105 break;
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106 default:
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107 goto bad_rtp_pkt;
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108 }
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109 if (rtp_start_flag && pkt.ssrc != rtp_ssrc) {
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110 if (!rtp_ssrc_chg_flag) {
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111 printf("Rx RTP stream changed SSRC\n");
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112 rtp_ssrc_chg_flag = 1;
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113 }
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114 reset_is_hunt();
188
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115 } else if (rtp_start_flag) {
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116 seq_delta = ntohs(pkt.seq) - rtp_last_seq;
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117 ts_delta = ntohl(pkt.tstamp) - rtp_last_ts;
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118 if (seq_delta == 0) {
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119 if (!rtp_seq_zero_flag) {
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120 printf("Rx RTP seq zero increment\n");
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121 rtp_seq_zero_flag = 1;
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122 }
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123 return;
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124 }
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125 if (seq_delta < 0) {
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126 if (!rtp_seq_neg_flag) {
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127 printf("Rx RTP seq negative increment\n");
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128 rtp_seq_neg_flag = 1;
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129 }
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130 return;
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131 }
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132 if (seq_delta != 1) {
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133 if (!rtp_seq_brk_flag) {
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134 printf("Rx RTP stream seq break\n");
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135 rtp_seq_brk_flag = 1;
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136 }
189
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diff changeset
137 reset_is_hunt();
188
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138 } else if (ts_delta != 160) {
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diff changeset
139 if (!rtp_ts_brk_flag) {
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140 printf("Rx RTP stream tstamp break\n");
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141 rtp_ts_brk_flag = 1;
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142 }
189
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143 reset_is_hunt();
188
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144 }
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145 }
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146 rtp_ssrc = pkt.ssrc;
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147 rtp_last_ts = ntohl(pkt.tstamp);
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148 rtp_last_seq = ntohs(pkt.seq);
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diff changeset
149 if (!rtp_start_flag) {
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150 printf("Rx RTP stream begins with seq=%u ts=%u\n",
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diff changeset
151 rtp_last_seq, rtp_last_ts);
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diff changeset
152 rtp_start_flag = 1;
187
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parents:
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153 }
189
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diff changeset
154 for (is_chunk = 0; is_chunk < 10; is_chunk++)
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diff changeset
155 is_hunt_proc(pkt.payload + is_chunk * 16, is_chunk);
187
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parents:
diff changeset
156 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157
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parents:
diff changeset
158 void
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parents:
diff changeset
159 rtcp_rx_select()
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parents:
diff changeset
160 {
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parents:
diff changeset
161 u_char buf[512];
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parents:
diff changeset
162
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parents:
diff changeset
163 recv(rtcp_udp_fd, buf, sizeof buf, 0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 if (!got_some_rtcp) {
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parents:
diff changeset
165 printf("Got some RTCP\n");
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
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parents:
diff changeset
166 got_some_rtcp = 1;
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parents:
diff changeset
167 }
258932879f8b sip-manual-out: rework for internal RTP handling, using themwi-rtp-mgr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 }