FreeCalypso > hg > themwi-system-sw
annotate mgw/pstn2gsm.c @ 180:565477d07418
themwi-rtp-mgr: close file descriptors after sending them across
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 11 Mar 2023 20:41:23 -0800 |
parents | c985c33baeac |
children | cf1ba5d65188 |
rev | line source |
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95
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themwi-mgw: initial implementation of PSTN to GSM forwarding
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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 PSTN to GSM 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 <gsm_efr.h> |
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19 #include "../include/tmgw_ctrl.h" |
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20 #include "../include/tmgw_const.h" |
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21 #include "struct.h" |
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22 #include "select.h" |
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23 #include "int_defs.h" |
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24 |
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25 extern uint16_t pcmu_decode_table[256]; |
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26 extern uint16_t pcma_decode_table[256]; |
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27 |
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28 #define ERR_WRONG_UDP_SRC 0x0001 |
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29 #define ERR_BAD_RTP_PACKET 0x0002 |
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30 #define ERR_SSRC_CHANGE 0x0004 |
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31 #define ERR_SEQ_BREAK 0x0008 |
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32 #define ERR_TSTAMP_BREAK 0x0010 |
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33 |
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34 void |
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35 pstn2gsm_rtp_in(in_fd, ep) |
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36 struct endpoint *ep; |
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37 { |
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38 struct rtp_packet pkt; |
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39 struct sockaddr_in sin_from; |
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40 socklen_t addrlen; |
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41 uint16_t *pcm_dec_table; |
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42 int16_t seq_delta; |
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43 int32_t ts_delta; |
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44 int16_t pcm_samples[SAMPLES_PER_FRAME]; |
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45 unsigned n; |
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46 int rc, m_out; |
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47 |
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48 addrlen = sizeof(struct sockaddr_in); |
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49 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0, |
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50 (struct sockaddr *) &sin_from, &addrlen); |
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51 if (rc < 0) |
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52 return; |
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53 if (sin_from.sin_addr.s_addr != ep->rtp_pstn.remote_addr.sin_addr.s_addr |
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54 || sin_from.sin_port != ep->rtp_pstn.remote_addr.sin_port) { |
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55 if (!(ep->p2g_err_flags & ERR_WRONG_UDP_SRC)) { |
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56 syslog(LOG_ERR, |
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57 "PSTN RTP ep got UDP packet from wrong source"); |
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58 ep->p2g_err_flags |= ERR_WRONG_UDP_SRC; |
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59 } |
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60 return; |
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61 } |
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62 if (rc != RTP_PACKET_SIZE_PSTN) { |
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63 bad_rtp_pkt: if (!(ep->p2g_err_flags & ERR_BAD_RTP_PACKET)) { |
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64 syslog(LOG_ERR, "Rx bad RTP packet on PSTN side"); |
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65 ep->p2g_err_flags |= ERR_BAD_RTP_PACKET; |
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66 } |
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67 return; |
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68 } |
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69 if (pkt.v_p_x_cc != 0x80) |
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70 goto bad_rtp_pkt; |
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71 switch (pkt.m_pt & 0x7F) { |
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72 case PSTN_CODEC_PCMU: |
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73 pcm_dec_table = pcmu_decode_table; |
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74 break; |
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75 case PSTN_CODEC_PCMA: |
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76 pcm_dec_table = pcma_decode_table; |
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77 break; |
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78 default: |
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79 goto bad_rtp_pkt; |
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80 } |
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81 if (ep->p2g_state && pkt.ssrc != ep->p2g_ssrc) { |
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82 if (!(ep->p2g_err_flags & ERR_SSRC_CHANGE)) { |
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83 syslog(LOG_ERR, "PSTN RTP stream changed SSRC"); |
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84 ep->p2g_err_flags |= ERR_SSRC_CHANGE; |
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85 } |
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86 ep->p2g_state = 0; |
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87 } |
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88 if (ep->p2g_state) { |
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89 seq_delta = ntohs(pkt.seq) - ep->p2g_last_seq; |
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90 ts_delta = ntohl(pkt.tstamp) - ep->p2g_last_ts; |
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91 if (seq_delta <= 0) |
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92 return; /* discard old or duplicate */ |
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93 if (seq_delta != 1) { |
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94 if (!(ep->p2g_err_flags & ERR_SEQ_BREAK)) { |
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95 syslog(LOG_ERR, "PSTN RTP stream seq break"); |
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96 ep->p2g_err_flags |= ERR_SEQ_BREAK; |
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97 } |
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98 m_out = 1; |
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99 } else if (ts_delta != SAMPLES_PER_FRAME) { |
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100 if (!(ep->p2g_err_flags & ERR_TSTAMP_BREAK)) { |
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101 syslog(LOG_ERR, "PSTN RTP stream tstamp break"); |
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102 ep->p2g_err_flags |= ERR_TSTAMP_BREAK; |
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103 } |
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104 m_out = 1; |
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105 } else |
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106 m_out = 0; |
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107 } else |
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108 m_out = 1; |
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109 ep->p2g_state = 1; |
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110 ep->p2g_ssrc = pkt.ssrc; |
96
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111 ep->p2g_last_ts = ntohl(pkt.tstamp); |
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112 ep->p2g_last_seq = ntohs(pkt.seq); |
95
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113 /* actual transcoding and forwarding */ |
97
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114 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_PSTN2GSM)) { |
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115 ep->p2g_drop_flag = 1; |
96
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116 return; |
97
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117 } |
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118 if (ep->p2g_drop_flag) { |
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119 ep->p2g_drop_flag = 0; |
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120 m_out = 1; |
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121 } |
95
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122 for (n = 0; n < SAMPLES_PER_FRAME; n++) |
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123 pcm_samples[n] = pcm_dec_table[pkt.payload[n]]; |
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124 pkt.m_pt = ep->gsm_payload_type; |
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125 if (m_out) |
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126 pkt.m_pt |= 0x80; |
96
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127 pkt.seq = htons(++ep->p2g_out_seq); |
95
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128 switch (ep->gsm_payload_msg_type) { |
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129 case GSM_TCHF_FRAME: |
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130 gsm_encode(ep->gsm_encoder_state, pcm_samples, pkt.payload); |
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131 break; |
174
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132 case GSM_TCHF_FRAME_EFR: |
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133 EFR_encode_frame(ep->gsm_encoder_state, pcm_samples, |
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134 pkt.payload, (int *) 0, (int *) 0); |
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135 break; |
95
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136 } |
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137 addrlen = sizeof(struct sockaddr_in); |
100
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138 sendto(ep->rtp_gsm.rtp_fd, &pkt, ep->gsm_rtp_pkt_size, 0, |
95
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139 (struct sockaddr *) &ep->rtp_gsm.remote_addr, addrlen); |
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140 } |
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141 |
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142 pstn2gsm_init(ep) |
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143 struct endpoint *ep; |
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144 { |
102
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145 if (ep->gsm_encoder_state) |
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146 return TMGW_RESP_OK; |
95
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147 switch (ep->gsm_payload_msg_type) { |
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148 case GSM_TCHF_FRAME: |
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149 ep->gsm_encoder_state = gsm_create(); |
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150 if (!ep->gsm_encoder_state) |
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151 return TMGW_RESP_ERR_RSRC; |
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152 break; |
174
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153 case GSM_TCHF_FRAME_EFR: |
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154 ep->gsm_encoder_state = EFR_encoder_create(0); |
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155 if (!ep->gsm_encoder_state) |
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156 return TMGW_RESP_ERR_RSRC; |
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157 break; |
95
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158 } |
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159 select_handlers[ep->rtp_pstn.rtp_fd] = pstn2gsm_rtp_in; |
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160 return TMGW_RESP_OK; |
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161 } |