FreeCalypso > hg > themwi-system-sw

annotate mgw/gsm2pstn.c @ 183:3962d9345a09

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rtp-mgr: use new EP type constant names
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Mar 2023 21:48:23 -0800
parents c985c33baeac
children cf1ba5d65188
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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>
103
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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 */
168
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18 #include <gsm_fr_preproc.h>
174
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19 #include <gsm_efr.h>
103
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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
103
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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;
103
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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];
169
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44 int rc, bfi, taf, m_out;
103
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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;
169
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51 pktsize = rc;
103
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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 }
169
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61 if (pktsize < RTP_PACKET_SIZE_BFI) {
103
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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;
170
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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;
103
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102 }
170
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103 m_out = 1;
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104 } else
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105 m_out = 0;
103
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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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124 gsmfr_preproc_bfi(ep->gsm_decoder_extra_state, taf,
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parents: 168
diff changeset
125 pkt.payload);
648a64b2e16b mgw: accept Themyscira-extension RTP BFI packets
Mychaela Falconia <falcon@freecalypso.org>
parents: 168
diff changeset
126 else
648a64b2e16b mgw: accept Themyscira-extension RTP BFI packets
Mychaela Falconia <falcon@freecalypso.org>
parents: 168
diff changeset
127 gsmfr_preproc_good_frame(ep->gsm_decoder_extra_state,
648a64b2e16b mgw: accept Themyscira-extension RTP BFI packets
Mychaela Falconia <falcon@freecalypso.org>
parents: 168
diff changeset
128 pkt.payload);
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 break;
174
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
131 case GSM_TCHF_FRAME_EFR:
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
132 if (bfi)
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
133 EFR_decode_bfi_nodata(ep->gsm_decoder_state, taf,
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
134 pcm_samples);
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
135 else
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
136 EFR_decode_frame(ep->gsm_decoder_state, pkt.payload,
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
137 0, 0, pcm_samples);
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
138 break;
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 }
170
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
140 if (ep->dtmf_sample_ptr) {
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
141 bcopy(ep->dtmf_sample_ptr, pcm_samples, SAMPLES_PER_FRAME*2);
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
142 ep->dtmf_sample_ptr += SAMPLES_PER_FRAME;
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
143 ep->dtmf_frames_sent++;
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
144 if (ep->dtmf_frames_sent >= DTMF_MAX_FRAMES)
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
145 ep->dtmf_sample_ptr = 0;
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
146 }
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 pkt.m_pt = ep->pstn_payload_type;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 if (m_out)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 pkt.m_pt |= 0x80;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 pkt.seq = htons(++ep->g2p_out_seq);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 addrlen = sizeof(struct sockaddr_in);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0,
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 }
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 gsm2pstn_init(ep)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 struct endpoint *ep;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 {
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 if (ep->gsm_decoder_state)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 return TMGW_RESP_OK;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 switch (ep->gsm_payload_msg_type) {
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 case GSM_TCHF_FRAME:
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 ep->gsm_decoder_state = gsm_create();
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 if (!ep->gsm_decoder_state)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 return TMGW_RESP_ERR_RSRC;
168
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
167 ep->gsm_decoder_extra_state = gsmfr_preproc_create();
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
168 if (!ep->gsm_decoder_extra_state) {
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
169 free(ep->gsm_decoder_state);
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
170 ep->gsm_decoder_state = 0;
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
171 return TMGW_RESP_ERR_RSRC;
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
172 }
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 break;
174
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
174 case GSM_TCHF_FRAME_EFR:
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
175 ep->gsm_decoder_state = EFR_decoder_create();
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
176 if (!ep->gsm_decoder_state)
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
177 return TMGW_RESP_ERR_RSRC;
c985c33baeac mgw: support EFR by way of libgsmefr
Mychaela Falconia <falcon@freecalypso.org>
parents: 170
diff changeset
178 break;
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 }
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 return TMGW_RESP_OK;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 }