FreeCalypso > hg > themwi-system-sw
annotate sip-manual-out/rtp.c @ 189:1266e024de6c
sip-manual-out: implement hunt for IS_Header in Rx RTP
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 17 Mar 2023 09:54:22 -0800 |
parents | 6aecee01cf0a |
children | 62ecc0aa081f |
rev | line source |
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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 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; |
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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 } |
189
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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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137 reset_is_hunt(); |
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138 } else if (ts_delta != 160) { |
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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(); |
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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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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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151 rtp_last_seq, rtp_last_ts); |
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152 rtp_start_flag = 1; |
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153 } |
189
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154 for (is_chunk = 0; is_chunk < 10; is_chunk++) |
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155 is_hunt_proc(pkt.payload + is_chunk * 16, is_chunk); |
187
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156 } |
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157 |
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158 void |
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159 rtcp_rx_select() |
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160 { |
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161 u_char buf[512]; |
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162 |
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163 recv(rtcp_udp_fd, buf, sizeof buf, 0); |
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164 if (!got_some_rtcp) { |
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165 printf("Got some RTCP\n"); |
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166 got_some_rtcp = 1; |
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167 } |
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168 } |