FreeCalypso > hg > themwi-system-sw
annotate mgw/pstn2gsm.c @ 112:6aa63cf4620a
sip-in call clearing: select timeout implemented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Wed, 28 Sep 2022 18:59:55 -0800 |
parents | d26d97974c8a |
children | f062c32a5116 |
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 <netinet/in.h> |
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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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15 #include <unistd.h> |
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16 #include <gsm.h> /* libgsm dependency */ |
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17 #include "../include/tmgw_ctrl.h" |
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18 #include "../include/tmgw_const.h" |
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19 #include "struct.h" |
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20 #include "select.h" |
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21 #include "int_defs.h" |
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22 |
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23 extern uint16_t pcmu_decode_table[256]; |
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24 extern uint16_t pcma_decode_table[256]; |
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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 pstn2gsm_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 uint16_t *pcm_dec_table; |
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40 int16_t seq_delta; |
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41 int32_t ts_delta; |
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42 int16_t pcm_samples[SAMPLES_PER_FRAME]; |
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43 unsigned n; |
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44 int rc, m_out; |
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45 |
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46 addrlen = sizeof(struct sockaddr_in); |
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47 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0, |
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48 (struct sockaddr *) &sin_from, &addrlen); |
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49 if (rc < 0) |
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50 return; |
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51 if (sin_from.sin_addr.s_addr != ep->rtp_pstn.remote_addr.sin_addr.s_addr |
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52 || sin_from.sin_port != ep->rtp_pstn.remote_addr.sin_port) { |
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53 if (!(ep->p2g_err_flags & ERR_WRONG_UDP_SRC)) { |
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54 syslog(LOG_ERR, |
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55 "PSTN RTP ep got UDP packet from wrong source"); |
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56 ep->p2g_err_flags |= ERR_WRONG_UDP_SRC; |
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57 } |
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58 return; |
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59 } |
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60 if (rc != RTP_PACKET_SIZE_PSTN) { |
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61 bad_rtp_pkt: if (!(ep->p2g_err_flags & ERR_BAD_RTP_PACKET)) { |
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62 syslog(LOG_ERR, "Rx bad RTP packet on PSTN side"); |
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63 ep->p2g_err_flags |= ERR_BAD_RTP_PACKET; |
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64 } |
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65 return; |
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66 } |
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67 if (pkt.v_p_x_cc != 0x80) |
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68 goto bad_rtp_pkt; |
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69 switch (pkt.m_pt & 0x7F) { |
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70 case PSTN_CODEC_PCMU: |
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71 pcm_dec_table = pcmu_decode_table; |
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72 break; |
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73 case PSTN_CODEC_PCMA: |
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74 pcm_dec_table = pcma_decode_table; |
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75 break; |
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76 default: |
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77 goto bad_rtp_pkt; |
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78 } |
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79 if (ep->p2g_state && pkt.ssrc != ep->p2g_ssrc) { |
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80 if (!(ep->p2g_err_flags & ERR_SSRC_CHANGE)) { |
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81 syslog(LOG_ERR, "PSTN RTP stream changed SSRC"); |
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82 ep->p2g_err_flags |= ERR_SSRC_CHANGE; |
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83 } |
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84 ep->p2g_state = 0; |
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85 } |
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86 if (ep->p2g_state) { |
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87 seq_delta = ntohs(pkt.seq) - ep->p2g_last_seq; |
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88 ts_delta = ntohl(pkt.tstamp) - ep->p2g_last_ts; |
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89 if (seq_delta <= 0) |
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90 return; /* discard old or duplicate */ |
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91 if (seq_delta != 1) { |
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92 if (!(ep->p2g_err_flags & ERR_SEQ_BREAK)) { |
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93 syslog(LOG_ERR, "PSTN RTP stream seq break"); |
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94 ep->p2g_err_flags |= ERR_SEQ_BREAK; |
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95 } |
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96 m_out = 1; |
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97 } else if (ts_delta != SAMPLES_PER_FRAME) { |
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98 if (!(ep->p2g_err_flags & ERR_TSTAMP_BREAK)) { |
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99 syslog(LOG_ERR, "PSTN RTP stream tstamp break"); |
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100 ep->p2g_err_flags |= ERR_TSTAMP_BREAK; |
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101 } |
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102 m_out = 1; |
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103 } else |
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104 m_out = 0; |
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105 } else |
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106 m_out = 1; |
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107 ep->p2g_state = 1; |
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108 ep->p2g_ssrc = pkt.ssrc; |
96
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109 ep->p2g_last_ts = ntohl(pkt.tstamp); |
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110 ep->p2g_last_seq = ntohs(pkt.seq); |
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111 /* actual transcoding and forwarding */ |
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112 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_PSTN2GSM)) { |
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113 ep->p2g_drop_flag = 1; |
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114 return; |
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115 } |
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116 if (ep->p2g_drop_flag) { |
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117 ep->p2g_drop_flag = 0; |
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118 m_out = 1; |
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119 } |
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120 for (n = 0; n < SAMPLES_PER_FRAME; n++) |
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121 pcm_samples[n] = pcm_dec_table[pkt.payload[n]]; |
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122 pkt.m_pt = ep->gsm_payload_type; |
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123 if (m_out) |
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124 pkt.m_pt |= 0x80; |
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125 pkt.seq = htons(++ep->p2g_out_seq); |
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126 switch (ep->gsm_payload_msg_type) { |
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127 case GSM_TCHF_FRAME: |
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128 gsm_encode(ep->gsm_encoder_state, pcm_samples, pkt.payload); |
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129 break; |
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130 } |
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131 addrlen = sizeof(struct sockaddr_in); |
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132 sendto(ep->rtp_gsm.rtp_fd, &pkt, ep->gsm_rtp_pkt_size, 0, |
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133 (struct sockaddr *) &ep->rtp_gsm.remote_addr, addrlen); |
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134 } |
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135 |
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136 pstn2gsm_init(ep) |
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137 struct endpoint *ep; |
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138 { |
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139 if (ep->gsm_encoder_state) |
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140 return TMGW_RESP_OK; |
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141 switch (ep->gsm_payload_msg_type) { |
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142 case GSM_TCHF_FRAME: |
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143 ep->gsm_encoder_state = gsm_create(); |
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144 if (!ep->gsm_encoder_state) |
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145 return TMGW_RESP_ERR_RSRC; |
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146 break; |
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147 } |
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148 select_handlers[ep->rtp_pstn.rtp_fd] = pstn2gsm_rtp_in; |
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149 return TMGW_RESP_OK; |
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150 } |