FreeCalypso > hg > themwi-system-sw
annotate mgw/gsm2pstn.c @ 148:b51247739897
sip-manual-out: attempt to play along with re-INVITEs
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 08 Oct 2022 23:52:08 -0800 |
parents | f062c32a5116 |
children | 8c28426abef0 |
rev | line source |
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1 /* |
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2 * In this module we implement our RTP gateway function |
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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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7 #include <sys/socket.h> |
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8 #include <sys/time.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 <syslog.h> |
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16 #include <unistd.h> |
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17 #include <gsm.h> /* libgsm dependency */ |
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18 #include "../include/tmgw_ctrl.h" |
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19 #include "../include/tmgw_const.h" |
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20 #include "struct.h" |
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21 #include "select.h" |
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22 #include "int_defs.h" |
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23 |
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24 extern struct timeval cur_event_time; |
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25 |
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26 #define ERR_WRONG_UDP_SRC 0x0001 |
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27 #define ERR_BAD_RTP_PACKET 0x0002 |
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28 #define ERR_SSRC_CHANGE 0x0004 |
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29 #define ERR_SEQ_BREAK 0x0008 |
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30 #define ERR_TSTAMP_BREAK 0x0010 |
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31 |
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32 void |
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33 gsm2pstn_rtp_in(in_fd, ep) |
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34 struct endpoint *ep; |
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35 { |
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36 struct rtp_packet pkt; |
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37 struct sockaddr_in sin_from; |
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38 socklen_t addrlen; |
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39 int16_t seq_delta; |
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40 int32_t ts_delta; |
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41 int16_t pcm_samples[SAMPLES_PER_FRAME]; |
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42 int rc, m_out; |
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43 |
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44 addrlen = sizeof(struct sockaddr_in); |
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45 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0, |
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46 (struct sockaddr *) &sin_from, &addrlen); |
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47 if (rc < 0) |
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48 return; |
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49 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr |
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50 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) { |
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51 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) { |
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52 syslog(LOG_ERR, |
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53 "GSM RTP ep got UDP packet from wrong source"); |
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54 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC; |
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55 } |
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56 return; |
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57 } |
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58 if (rc != ep->gsm_rtp_pkt_size) { |
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59 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) { |
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60 syslog(LOG_ERR, "Rx bad RTP packet on GSM side"); |
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61 ep->g2p_err_flags |= ERR_BAD_RTP_PACKET; |
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62 } |
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63 return; |
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64 } |
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65 if (pkt.v_p_x_cc != 0x80) |
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66 goto bad_rtp_pkt; |
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67 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type) |
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68 goto bad_rtp_pkt; |
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69 if ((pkt.payload[0] & 0xF0) != ep->gsm_payload_magic) |
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70 goto bad_rtp_pkt; |
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71 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) { |
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72 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) { |
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73 syslog(LOG_ERR, "GSM RTP stream changed SSRC"); |
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74 ep->g2p_err_flags |= ERR_SSRC_CHANGE; |
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75 } |
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76 ep->g2p_state = 0; |
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77 if (ep->dtmf_pp) |
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78 dtmf_stop_immediate(ep); |
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79 } |
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80 if (ep->g2p_state) { |
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81 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq; |
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82 ts_delta = ntohl(pkt.tstamp) - ep->g2p_last_ts; |
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83 if (seq_delta <= 0) |
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84 return; /* discard old or duplicate */ |
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85 if (seq_delta != 1) { |
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86 if (!(ep->g2p_err_flags & ERR_SEQ_BREAK)) { |
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87 syslog(LOG_ERR, "GSM RTP stream seq break"); |
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88 ep->g2p_err_flags |= ERR_SEQ_BREAK; |
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89 } |
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90 m_out = 1; |
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91 } else { |
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92 if (ts_delta == SAMPLES_PER_FRAME) |
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93 m_out = 0; |
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94 else if (ts_delta > 0 && |
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95 ts_delta % SAMPLES_PER_FRAME == 0) |
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96 m_out = 1; |
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97 else { |
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98 if (!(ep->g2p_err_flags & ERR_TSTAMP_BREAK)) { |
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99 syslog(LOG_ERR, |
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100 "GSM RTP stream tstamp break"); |
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101 ep->g2p_err_flags |= ERR_TSTAMP_BREAK; |
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102 } |
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103 m_out = 1; |
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104 } |
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105 } |
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106 } else |
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107 m_out = 1; |
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108 ep->g2p_state = 1; |
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109 ep->g2p_ssrc = pkt.ssrc; |
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110 ep->g2p_last_ts = ntohl(pkt.tstamp); |
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111 ep->g2p_last_seq = ntohs(pkt.seq); |
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112 ep->g2p_local_time = cur_event_time; |
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113 /* actual transcoding and forwarding */ |
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114 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN)) { |
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115 ep->g2p_drop_flag = 1; |
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116 return; |
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117 } |
127
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118 if (ep->dtmf_pp) |
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119 return; |
103
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120 if (ep->g2p_drop_flag) { |
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121 ep->g2p_drop_flag = 0; |
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122 m_out = 1; |
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123 } |
127
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124 if (ep->dtmf_aftermath) { |
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125 ts_delta = ep->g2p_last_ts - ep->dtmf_last_ts; |
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126 if (ts_delta <= 0) |
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127 return; |
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128 ep->dtmf_aftermath = 0; |
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129 if (ts_delta == SAMPLES_PER_FRAME) |
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130 m_out = 0; |
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131 else |
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132 m_out = 1; |
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133 } |
103
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134 switch (ep->gsm_payload_msg_type) { |
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135 case GSM_TCHF_FRAME: |
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136 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples); |
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137 break; |
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138 } |
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139 pkt.m_pt = ep->pstn_payload_type; |
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140 if (m_out) |
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141 pkt.m_pt |= 0x80; |
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142 pkt.seq = htons(++ep->g2p_out_seq); |
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143 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type); |
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144 addrlen = sizeof(struct sockaddr_in); |
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145 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0, |
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146 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen); |
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147 } |
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148 |
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149 gsm2pstn_init(ep) |
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150 struct endpoint *ep; |
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151 { |
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152 if (ep->gsm_decoder_state) |
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153 return TMGW_RESP_OK; |
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154 switch (ep->gsm_payload_msg_type) { |
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155 case GSM_TCHF_FRAME: |
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parents:
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156 ep->gsm_decoder_state = gsm_create(); |
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157 if (!ep->gsm_decoder_state) |
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158 return TMGW_RESP_ERR_RSRC; |
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parents:
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159 break; |
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parents:
diff
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|
160 } |
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parents:
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|
161 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in; |
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parents:
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162 return TMGW_RESP_OK; |
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parents:
diff
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163 } |