FreeCalypso > hg > themwi-system-sw
annotate mgw/gsm2pstn.c @ 195:a3d71489672f
sip-manual-out: implement tfo-req command
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 17 Mar 2023 17:22:42 -0800 |
parents | c985c33baeac |
children | cf1ba5d65188 |
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 <gsm_fr_preproc.h> |
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19 #include <gsm_efr.h> |
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20 #include "../include/tmgw_ctrl.h" |
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21 #include "../include/tmgw_const.h" |
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22 #include "struct.h" |
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23 #include "select.h" |
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24 #include "int_defs.h" |
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25 #include "dtmf_defs.h" |
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26 |
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27 #define ERR_WRONG_UDP_SRC 0x0001 |
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28 #define ERR_BAD_RTP_PACKET 0x0002 |
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29 #define ERR_SSRC_CHANGE 0x0004 |
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30 #define ERR_SEQ_BREAK 0x0008 |
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31 #define ERR_TSTAMP_BREAK 0x0010 |
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32 |
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33 void |
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34 gsm2pstn_rtp_in(in_fd, ep) |
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35 struct endpoint *ep; |
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36 { |
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37 struct rtp_packet pkt; |
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38 struct sockaddr_in sin_from; |
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39 socklen_t addrlen; |
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40 unsigned pktsize; |
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41 int16_t seq_delta; |
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42 int32_t ts_delta; |
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43 int16_t pcm_samples[SAMPLES_PER_FRAME]; |
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44 int rc, bfi, taf, 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 pktsize = rc; |
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52 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr |
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53 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) { |
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54 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) { |
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55 syslog(LOG_ERR, |
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56 "GSM RTP ep got UDP packet from wrong source"); |
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57 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC; |
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58 } |
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59 return; |
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60 } |
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61 if (pktsize < RTP_PACKET_SIZE_BFI) { |
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62 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) { |
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63 syslog(LOG_ERR, "Rx bad RTP packet on GSM side"); |
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64 ep->g2p_err_flags |= ERR_BAD_RTP_PACKET; |
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65 } |
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66 return; |
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67 } |
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68 if (pkt.v_p_x_cc != 0x80) |
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69 goto bad_rtp_pkt; |
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70 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type) |
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71 goto bad_rtp_pkt; |
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72 if (pktsize == ep->gsm_rtp_pkt_size && |
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73 (pkt.payload[0] & 0xF0) == ep->gsm_payload_magic) |
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74 bfi = 0; |
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75 else if (pktsize == RTP_PACKET_SIZE_BFI && pkt.payload[0] == 0xBF) { |
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76 bfi = 1; |
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77 taf = pkt.payload[1] & 1; |
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78 } else |
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79 goto bad_rtp_pkt; |
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80 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) { |
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81 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) { |
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82 syslog(LOG_ERR, "GSM RTP stream changed SSRC"); |
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83 ep->g2p_err_flags |= ERR_SSRC_CHANGE; |
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84 } |
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85 ep->g2p_state = 0; |
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86 } |
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87 if (ep->g2p_state) { |
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88 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq; |
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89 ts_delta = ntohl(pkt.tstamp) - ep->g2p_last_ts; |
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90 if (seq_delta <= 0) |
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91 return; /* discard old or duplicate */ |
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92 if (seq_delta != 1) { |
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93 if (!(ep->g2p_err_flags & ERR_SEQ_BREAK)) { |
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94 syslog(LOG_ERR, "GSM RTP stream seq break"); |
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95 ep->g2p_err_flags |= ERR_SEQ_BREAK; |
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96 } |
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97 m_out = 1; |
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98 } else if (ts_delta != SAMPLES_PER_FRAME) { |
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99 if (!(ep->g2p_err_flags & ERR_TSTAMP_BREAK)) { |
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100 syslog(LOG_ERR, "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 } else |
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105 m_out = 0; |
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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 /* actual transcoding and forwarding */ |
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113 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN)) { |
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114 ep->g2p_drop_flag = 1; |
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115 return; |
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116 } |
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117 if (ep->g2p_drop_flag) { |
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118 ep->g2p_drop_flag = 0; |
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119 m_out = 1; |
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120 } |
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121 switch (ep->gsm_payload_msg_type) { |
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122 case GSM_TCHF_FRAME: |
169
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123 if (bfi) |
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168
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124 gsmfr_preproc_bfi(ep->gsm_decoder_extra_state, taf, |
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125 pkt.payload); |
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126 else |
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127 gsmfr_preproc_good_frame(ep->gsm_decoder_extra_state, |
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168
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128 pkt.payload); |
103
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129 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples); |
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130 break; |
174
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131 case GSM_TCHF_FRAME_EFR: |
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132 if (bfi) |
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133 EFR_decode_bfi_nodata(ep->gsm_decoder_state, taf, |
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134 pcm_samples); |
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135 else |
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136 EFR_decode_frame(ep->gsm_decoder_state, pkt.payload, |
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137 0, 0, pcm_samples); |
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138 break; |
103
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139 } |
170
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140 if (ep->dtmf_sample_ptr) { |
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169
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141 bcopy(ep->dtmf_sample_ptr, pcm_samples, SAMPLES_PER_FRAME*2); |
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142 ep->dtmf_sample_ptr += SAMPLES_PER_FRAME; |
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143 ep->dtmf_frames_sent++; |
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169
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144 if (ep->dtmf_frames_sent >= DTMF_MAX_FRAMES) |
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145 ep->dtmf_sample_ptr = 0; |
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146 } |
103
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147 pkt.m_pt = ep->pstn_payload_type; |
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148 if (m_out) |
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149 pkt.m_pt |= 0x80; |
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150 pkt.seq = htons(++ep->g2p_out_seq); |
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151 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type); |
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152 addrlen = sizeof(struct sockaddr_in); |
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153 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0, |
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154 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen); |
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155 } |
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156 |
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157 gsm2pstn_init(ep) |
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158 struct endpoint *ep; |
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159 { |
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160 if (ep->gsm_decoder_state) |
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161 return TMGW_RESP_OK; |
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162 switch (ep->gsm_payload_msg_type) { |
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163 case GSM_TCHF_FRAME: |
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164 ep->gsm_decoder_state = gsm_create(); |
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165 if (!ep->gsm_decoder_state) |
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166 return TMGW_RESP_ERR_RSRC; |
168
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127
diff
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|
167 ep->gsm_decoder_extra_state = gsmfr_preproc_create(); |
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127
diff
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|
168 if (!ep->gsm_decoder_extra_state) { |
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127
diff
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|
169 free(ep->gsm_decoder_state); |
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127
diff
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|
170 ep->gsm_decoder_state = 0; |
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127
diff
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|
171 return TMGW_RESP_ERR_RSRC; |
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parents:
127
diff
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|
172 } |
103
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parents:
diff
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|
173 break; |
174
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parents:
170
diff
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|
174 case GSM_TCHF_FRAME_EFR: |
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170
diff
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|
175 ep->gsm_decoder_state = EFR_decoder_create(); |
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170
diff
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|
176 if (!ep->gsm_decoder_state) |
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parents:
170
diff
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|
177 return TMGW_RESP_ERR_RSRC; |
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170
diff
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|
178 break; |
103
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parents:
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|
179 } |
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parents:
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180 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in; |
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181 return TMGW_RESP_OK; |
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parents:
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|
182 } |