FreeCalypso > hg > themwi-system-sw

annotate mgw/gsm2pstn.c @ 123:a36b731bfef9

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sip-manual-out: implement sending BYE and CANCEL
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 29 Sep 2022 17:21:11 -0800
parents 3b3f07b112f3
children f062c32a5116
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103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * In this module we implement our RTP gateway function
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
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3 * in the GSM to PSTN direction.
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4 */
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5
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6 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include <sys/socket.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <netinet/in.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <stdio.h>
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10 #include <stdint.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include <syslog.h>
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Mychaela Falconia <falcon@freecalypso.org>
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15 #include <unistd.h>
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include <gsm.h> /* libgsm dependency */
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Mychaela Falconia <falcon@freecalypso.org>
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17 #include "../include/tmgw_ctrl.h"
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Mychaela Falconia <falcon@freecalypso.org>
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18 #include "../include/tmgw_const.h"
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Mychaela Falconia <falcon@freecalypso.org>
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19 #include "struct.h"
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Mychaela Falconia <falcon@freecalypso.org>
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20 #include "select.h"
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Mychaela Falconia <falcon@freecalypso.org>
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21 #include "int_defs.h"
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Mychaela Falconia <falcon@freecalypso.org>
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22
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Mychaela Falconia <falcon@freecalypso.org>
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23 #define ERR_WRONG_UDP_SRC 0x0001
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Mychaela Falconia <falcon@freecalypso.org>
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24 #define ERR_BAD_RTP_PACKET 0x0002
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25 #define ERR_SSRC_CHANGE 0x0004
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Mychaela Falconia <falcon@freecalypso.org>
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26 #define ERR_SEQ_BREAK 0x0008
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Mychaela Falconia <falcon@freecalypso.org>
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27 #define ERR_TSTAMP_BREAK 0x0010
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28
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29 void
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30 gsm2pstn_rtp_in(in_fd, ep)
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31 struct endpoint *ep;
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32 {
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Mychaela Falconia <falcon@freecalypso.org>
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33 struct rtp_packet pkt;
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Mychaela Falconia <falcon@freecalypso.org>
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34 struct sockaddr_in sin_from;
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35 socklen_t addrlen;
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36 int16_t seq_delta;
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37 int32_t ts_delta;
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38 int16_t pcm_samples[SAMPLES_PER_FRAME];
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39 int rc, m_out;
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40
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41 addrlen = sizeof(struct sockaddr_in);
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42 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0,
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43 (struct sockaddr *) &sin_from, &addrlen);
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44 if (rc < 0)
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45 return;
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Mychaela Falconia <falcon@freecalypso.org>
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46 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr
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Mychaela Falconia <falcon@freecalypso.org>
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47 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) {
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Mychaela Falconia <falcon@freecalypso.org>
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48 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) {
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49 syslog(LOG_ERR,
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50 "GSM RTP ep got UDP packet from wrong source");
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51 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC;
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52 }
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53 return;
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54 }
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55 if (rc != ep->gsm_rtp_pkt_size) {
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56 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) {
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57 syslog(LOG_ERR, "Rx bad RTP packet on GSM side");
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58 ep->g2p_err_flags |= ERR_BAD_RTP_PACKET;
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59 }
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60 return;
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61 }
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Mychaela Falconia <falcon@freecalypso.org>
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62 if (pkt.v_p_x_cc != 0x80)
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63 goto bad_rtp_pkt;
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64 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type)
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65 goto bad_rtp_pkt;
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66 if ((pkt.payload[0] & 0xF0) != ep->gsm_payload_magic)
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67 goto bad_rtp_pkt;
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68 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) {
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69 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) {
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70 syslog(LOG_ERR, "GSM RTP stream changed SSRC");
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71 ep->g2p_err_flags |= ERR_SSRC_CHANGE;
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72 }
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73 ep->g2p_state = 0;
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74 }
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75 if (ep->g2p_state) {
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76 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq;
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77 ts_delta = ntohl(pkt.tstamp) - ep->g2p_last_ts;
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78 if (seq_delta <= 0)
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79 return; /* discard old or duplicate */
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80 if (seq_delta != 1) {
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81 if (!(ep->g2p_err_flags & ERR_SEQ_BREAK)) {
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82 syslog(LOG_ERR, "GSM RTP stream seq break");
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83 ep->g2p_err_flags |= ERR_SEQ_BREAK;
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84 }
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85 m_out = 1;
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86 } else {
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87 if (ts_delta == SAMPLES_PER_FRAME)
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88 m_out = 0;
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89 else if (ts_delta > 0 &&
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90 ts_delta % SAMPLES_PER_FRAME == 0)
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91 m_out = 1;
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92 else {
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93 if (!(ep->g2p_err_flags & ERR_TSTAMP_BREAK)) {
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parents:
diff changeset
94 syslog(LOG_ERR,
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parents:
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95 "GSM RTP stream tstamp break");
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96 ep->g2p_err_flags |= ERR_TSTAMP_BREAK;
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97 }
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98 m_out = 1;
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99 }
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100 }
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101 } else
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102 m_out = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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103 ep->g2p_state = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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104 ep->g2p_ssrc = pkt.ssrc;
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105 ep->g2p_last_ts = ntohl(pkt.tstamp);
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106 ep->g2p_last_seq = ntohs(pkt.seq);
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107 /* actual transcoding and forwarding */
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108 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN)) {
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Mychaela Falconia <falcon@freecalypso.org>
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109 ep->g2p_drop_flag = 1;
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110 return;
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Mychaela Falconia <falcon@freecalypso.org>
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111 }
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Mychaela Falconia <falcon@freecalypso.org>
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112 if (ep->g2p_drop_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
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113 ep->g2p_drop_flag = 0;
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114 m_out = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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115 }
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Mychaela Falconia <falcon@freecalypso.org>
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116 switch (ep->gsm_payload_msg_type) {
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Mychaela Falconia <falcon@freecalypso.org>
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117 case GSM_TCHF_FRAME:
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Mychaela Falconia <falcon@freecalypso.org>
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118 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples);
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Mychaela Falconia <falcon@freecalypso.org>
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119 break;
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120 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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121 pkt.m_pt = ep->pstn_payload_type;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 if (m_out)
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Mychaela Falconia <falcon@freecalypso.org>
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123 pkt.m_pt |= 0x80;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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124 pkt.seq = htons(++ep->g2p_out_seq);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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126 addrlen = sizeof(struct sockaddr_in);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
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128 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen);
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129 }
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130
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131 gsm2pstn_init(ep)
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132 struct endpoint *ep;
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133 {
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134 if (ep->gsm_decoder_state)
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135 return TMGW_RESP_OK;
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136 switch (ep->gsm_payload_msg_type) {
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137 case GSM_TCHF_FRAME:
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138 ep->gsm_decoder_state = gsm_create();
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139 if (!ep->gsm_decoder_state)
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140 return TMGW_RESP_ERR_RSRC;
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141 break;
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142 }
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143 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in;
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144 return TMGW_RESP_OK;
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145 }