FreeCalypso > hg > themwi-system-sw

annotate mgw/gsm2pstn.c @ 170:a6eb2de277f6

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mgw: massive simplification for continuous RTP stream from BTS
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 20 Nov 2022 01:58:47 -0800
parents 648a64b2e16b
children c985c33baeac
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>
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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 "../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 #include "dtmf_defs.h"
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25
103
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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 unsigned pktsize;
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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 int rc, bfi, taf, m_out;
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44
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45 addrlen = sizeof(struct sockaddr_in);
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46 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0,
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47 (struct sockaddr *) &sin_from, &addrlen);
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48 if (rc < 0)
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49 return;
169
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50 pktsize = rc;
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51 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr
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52 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) {
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53 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) {
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54 syslog(LOG_ERR,
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55 "GSM RTP ep got UDP packet from wrong source");
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56 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC;
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57 }
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58 return;
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59 }
169
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60 if (pktsize < RTP_PACKET_SIZE_BFI) {
103
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61 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) {
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62 syslog(LOG_ERR, "Rx bad RTP packet on GSM side");
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63 ep->g2p_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 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type)
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70 goto bad_rtp_pkt;
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71 if (pktsize == ep->gsm_rtp_pkt_size &&
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72 (pkt.payload[0] & 0xF0) == ep->gsm_payload_magic)
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73 bfi = 0;
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74 else if (pktsize == RTP_PACKET_SIZE_BFI && pkt.payload[0] == 0xBF) {
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75 bfi = 1;
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76 taf = pkt.payload[1] & 1;
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77 } else
103
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78 goto bad_rtp_pkt;
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79 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) {
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80 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) {
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81 syslog(LOG_ERR, "GSM RTP stream changed SSRC");
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82 ep->g2p_err_flags |= ERR_SSRC_CHANGE;
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83 }
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84 ep->g2p_state = 0;
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85 }
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86 if (ep->g2p_state) {
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87 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq;
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88 ts_delta = ntohl(pkt.tstamp) - ep->g2p_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->g2p_err_flags & ERR_SEQ_BREAK)) {
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93 syslog(LOG_ERR, "GSM RTP stream seq break");
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94 ep->g2p_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->g2p_err_flags & ERR_TSTAMP_BREAK)) {
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99 syslog(LOG_ERR, "GSM RTP stream tstamp break");
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100 ep->g2p_err_flags |= ERR_TSTAMP_BREAK;
103
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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;
103
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105 } else
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106 m_out = 1;
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107 ep->g2p_state = 1;
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108 ep->g2p_ssrc = pkt.ssrc;
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109 ep->g2p_last_ts = ntohl(pkt.tstamp);
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110 ep->g2p_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_GSM2PSTN)) {
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113 ep->g2p_drop_flag = 1;
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114 return;
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115 }
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116 if (ep->g2p_drop_flag) {
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117 ep->g2p_drop_flag = 0;
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118 m_out = 1;
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119 }
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120 switch (ep->gsm_payload_msg_type) {
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121 case GSM_TCHF_FRAME:
169
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122 if (bfi)
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123 gsmfr_preproc_bfi(ep->gsm_decoder_extra_state, taf,
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124 pkt.payload);
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parents: 168
diff changeset
125 else
648a64b2e16b mgw: accept Themyscira-extension RTP BFI packets
Mychaela Falconia <falcon@freecalypso.org>
parents: 168
diff changeset
126 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
127 pkt.payload);
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 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
129 break;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 }
170
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
131 if (ep->dtmf_sample_ptr) {
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
132 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
133 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
134 ep->dtmf_frames_sent++;
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
135 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
136 ep->dtmf_sample_ptr = 0;
a6eb2de277f6 mgw: massive simplification for continuous RTP stream from BTS
Mychaela Falconia <falcon@freecalypso.org>
parents: 169
diff changeset
137 }
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 pkt.m_pt = ep->pstn_payload_type;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 if (m_out)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 pkt.m_pt |= 0x80;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 pkt.seq = htons(++ep->g2p_out_seq);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 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
143 addrlen = sizeof(struct sockaddr_in);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 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
145 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen);
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 }
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 gsm2pstn_init(ep)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 struct endpoint *ep;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 {
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 if (ep->gsm_decoder_state)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 return TMGW_RESP_OK;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 switch (ep->gsm_payload_msg_type) {
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 case GSM_TCHF_FRAME:
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 ep->gsm_decoder_state = gsm_create();
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 if (!ep->gsm_decoder_state)
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 return TMGW_RESP_ERR_RSRC;
168
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
158 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
159 if (!ep->gsm_decoder_extra_state) {
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
160 free(ep->gsm_decoder_state);
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
161 ep->gsm_decoder_state = 0;
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
162 return TMGW_RESP_ERR_RSRC;
8c28426abef0 mgw: start using the new libgsmfrp dependency
Mychaela Falconia <falcon@freecalypso.org>
parents: 127
diff changeset
163 }
103
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 break;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 }
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 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
167 return TMGW_RESP_OK;
3b3f07b112f3 mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 }