FreeCalypso > hg > themwi-system-sw
annotate sip-manual-out/rtp_tx.c @ 244:db366c3b35f7
top Makefile: mncc changed to use libnumdb2
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 14 Aug 2023 19:14:08 -0800 |
parents | b3aeacc5722a |
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rev | line source |
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1 /* |
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2 * In this module we implement outgoing RTP stream generation. |
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3 */ |
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4 |
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5 #include <sys/types.h> |
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6 #include <sys/socket.h> |
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7 #include <sys/time.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 <unistd.h> |
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15 #include "../include/tmgw_const.h" |
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16 #include "../include/rtp_defs.h" |
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17 #include "../libutil/osmo_bits.h" |
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18 |
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19 extern struct sockaddr_in rtp_local_addr, rtp_remote_addr; |
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20 extern int rtp_udp_fd, rtcp_udp_fd, pcma_selected; |
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21 extern struct timeval cur_event_time; |
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22 |
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23 static uint32_t rtp_ssrc; |
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24 static uint32_t rtp_out_ts; |
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25 static uint16_t rtp_out_seq; |
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26 |
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27 static uint8_t pcm_fill_octet; |
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28 |
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29 static uint16_t tfo_fill_buf[9], tfo_req_buf[7]; |
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30 static uint16_t *is_out_ptr; |
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31 static unsigned is_out_count; |
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32 static int tfo_stop_req; |
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33 |
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34 void |
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35 assign_rtpout_ssrc() |
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36 { |
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37 rtp_ssrc = cur_event_time.tv_sec ^ cur_event_time.tv_usec ^ getpid(); |
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38 } |
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39 |
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40 void |
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41 init_pcm_fill_octet() |
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42 { |
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43 if (pcma_selected) |
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44 pcm_fill_octet = 0xD5; |
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45 else |
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46 pcm_fill_octet = 0xFF; |
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47 } |
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48 |
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49 void |
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50 prepare_tfo_fill() |
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51 { |
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52 tfo_fill_buf[0] = 0x15A; |
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53 tfo_fill_buf[1] = 0x1A9; |
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54 tfo_fill_buf[2] = 0x129; |
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55 tfo_fill_buf[3] = 0x15A; |
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56 tfo_fill_buf[4] = 0x1A9; |
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57 tfo_fill_buf[5] = 0x129; |
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58 tfo_fill_buf[6] = 0x15A; |
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59 tfo_fill_buf[7] = 0x1A9; |
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60 tfo_fill_buf[8] = 0x129; |
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61 } |
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62 |
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63 static void |
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64 insert_is_msg(payload, word) |
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65 uint8_t *payload; |
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66 uint16_t word; |
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67 { |
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68 ubit_t is_bits[10]; |
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69 uint8_t *bytep; |
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70 unsigned n; |
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71 |
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72 uint16_to_bits(word, is_bits, 10); |
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73 for (n = 0; n < 10; n++) { |
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74 bytep = payload + n * 16; |
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75 *bytep &= 0xFE; |
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76 *bytep |= is_bits[n]; |
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77 } |
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78 } |
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79 |
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80 void |
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81 generate_rtp_packet() |
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82 { |
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83 struct rtp_packet pkt; |
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84 socklen_t addrlen; |
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85 |
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86 pkt.v_p_x_cc = 0x80; |
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87 pkt.m_pt = pcma_selected ? PSTN_CODEC_PCMA : PSTN_CODEC_PCMU; |
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88 pkt.seq = htons(rtp_out_seq++); |
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89 pkt.tstamp = htonl(rtp_out_ts); |
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90 rtp_out_ts += 160; |
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91 pkt.ssrc = rtp_ssrc; |
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92 memset(pkt.payload, pcm_fill_octet, RTP_MAX_PAYLOAD); |
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93 if (is_out_count) { |
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94 insert_is_msg(pkt.payload, *is_out_ptr++); |
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95 is_out_count--; |
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96 if (!is_out_count && !tfo_stop_req) { |
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97 is_out_ptr = tfo_req_buf; |
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98 is_out_count = 7; |
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99 } |
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100 } |
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101 addrlen = sizeof(struct sockaddr_in); |
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102 sendto(rtp_udp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0, |
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103 (struct sockaddr *) &rtp_remote_addr, addrlen); |
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104 } |
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105 |
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106 void |
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107 set_pcm_fill_octet(oct) |
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108 unsigned oct; |
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109 { |
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110 pcm_fill_octet = oct; |
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111 } |
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112 |
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113 void |
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114 send_tfo_req(sig, codec) |
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115 unsigned sig, codec; |
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116 { |
201
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117 tfo_req_buf[0] = 0x15A; |
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118 tfo_req_buf[1] = 0x1A9; |
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119 tfo_req_buf[2] = 0x05D; |
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120 tfo_req_buf[3] = 0x14E; |
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121 tfo_req_buf[4] = 0x14B; |
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122 encode_tfo_ext_words(sig, codec, 0, tfo_req_buf + 5); |
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123 is_out_ptr = tfo_fill_buf; |
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124 is_out_count = 9; |
202
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125 tfo_stop_req = 0; |
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126 } |
202
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127 |
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128 void |
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129 stop_tfo_out() |
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130 { |
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131 tfo_stop_req = 1; |
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132 } |