FreeCalypso > hg > sipout-test-utils
annotate test-fsk/rtp_rx.c @ 13:059b79c9f0c3
sipout-test-voice: add DMW output mode
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 07 Apr 2024 17:09:32 -0800 |
parents | eaf0e8f81a22 |
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rev | line source |
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1 /* |
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2 * In this module we implement our RTP handling: obtaining a PSTN-side |
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3 * RTP endpoint from themwi-rtp-mgr, then handling read select on RTP |
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4 * and RTCP UDP sockets. |
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5 */ |
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6 |
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7 #include <sys/types.h> |
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8 #include <sys/socket.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 "../include/tmgw_const.h" |
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16 #include "../include/rtp_defs.h" |
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17 #include "../include/pstn_defs.h" |
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18 #include "../librtpalloc/rtp_alloc_simple.h" |
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19 |
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20 extern const uint16_t pcmu_decode_table[256]; |
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21 extern const uint16_t pcma_decode_table[256]; |
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22 |
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23 extern int rtp_out_enable; /* misusing the flag :-( */ |
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24 |
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25 struct sockaddr_in rtp_local_addr; |
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26 int rtp_udp_fd, rtcp_udp_fd; |
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27 |
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28 static int rtp_start_flag, rtp_bad_flag, rtp_ssrc_chg_flag; |
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29 static int rtp_seq_brk_flag, rtp_seq_zero_flag, rtp_seq_neg_flag; |
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30 static int rtp_ts_brk_flag; |
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31 static uint32_t rtp_ssrc; |
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32 static uint32_t rtp_last_ts; |
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33 static uint16_t rtp_last_seq; |
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34 static int got_some_rtcp; |
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35 |
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36 void |
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37 obtain_rtp_endp() |
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38 { |
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39 int rc; |
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40 struct rtp_alloc_simple res; |
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41 |
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42 rc = rtp_alloc_simple(TMGW_EP_TYPE_PSTN_ONLY, &res); |
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43 if (rc < 0) |
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44 exit(1); /* error msg already printed */ |
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45 bcopy(&res.pstn_addr, &rtp_local_addr, sizeof(struct sockaddr_in)); |
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46 rtp_udp_fd = res.pstn_rtp_fd; |
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47 rtcp_udp_fd = res.pstn_rtcp_fd; |
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48 } |
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49 |
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50 void |
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51 rtp_rx_select() |
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52 { |
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53 struct rtp_packet pkt; |
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54 struct sockaddr_in sin_from; |
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55 socklen_t addrlen; |
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56 int16_t seq_delta; |
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57 int32_t ts_delta; |
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58 const uint16_t *pcm_dec_table; |
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59 int16_t pcm_samples[FRAME_20MS]; |
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60 unsigned n; |
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61 int rc; |
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62 |
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63 addrlen = sizeof(struct sockaddr_in); |
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64 rc = recvfrom(rtp_udp_fd, &pkt, sizeof pkt, 0, |
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65 (struct sockaddr *) &sin_from, &addrlen); |
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66 if (rc < 0) |
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67 return; |
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68 if (rc != RTP_PACKET_SIZE_PSTN) { |
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69 bad_rtp_pkt: if (!rtp_bad_flag) { |
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70 printf("Got a bad RTP packet\n"); |
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71 rtp_bad_flag = 1; |
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72 } |
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73 return; |
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74 } |
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75 if (pkt.v_p_x_cc != 0x80) |
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76 goto bad_rtp_pkt; |
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77 switch (pkt.m_pt & 0x7F) { |
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78 case PSTN_CODEC_PCMU: |
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79 pcm_dec_table = pcmu_decode_table; |
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80 break; |
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81 case PSTN_CODEC_PCMA: |
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82 pcm_dec_table = pcma_decode_table; |
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83 break; |
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84 default: |
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85 goto bad_rtp_pkt; |
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86 } |
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87 if (rtp_start_flag && pkt.ssrc != rtp_ssrc) { |
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88 if (!rtp_ssrc_chg_flag) { |
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89 printf("Rx RTP stream changed SSRC\n"); |
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90 rtp_ssrc_chg_flag = 1; |
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91 } |
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92 } else if (rtp_start_flag) { |
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93 seq_delta = ntohs(pkt.seq) - rtp_last_seq; |
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94 ts_delta = ntohl(pkt.tstamp) - rtp_last_ts; |
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95 if (seq_delta == 0) { |
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96 if (!rtp_seq_zero_flag) { |
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97 printf("Rx RTP seq zero increment\n"); |
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98 rtp_seq_zero_flag = 1; |
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99 } |
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100 return; |
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101 } |
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102 if (seq_delta < 0) { |
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103 if (!rtp_seq_neg_flag) { |
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104 printf("Rx RTP seq negative increment\n"); |
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105 rtp_seq_neg_flag = 1; |
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106 } |
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107 return; |
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108 } |
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109 if (seq_delta != 1) { |
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110 if (!rtp_seq_brk_flag) { |
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111 printf("Rx RTP stream seq break\n"); |
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112 rtp_seq_brk_flag = 1; |
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113 } |
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114 } else if (ts_delta != 160) { |
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115 if (!rtp_ts_brk_flag) { |
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116 printf("Rx RTP stream tstamp break\n"); |
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117 rtp_ts_brk_flag = 1; |
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118 } |
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119 } |
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120 } |
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121 rtp_ssrc = pkt.ssrc; |
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122 rtp_last_ts = ntohl(pkt.tstamp); |
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123 rtp_last_seq = ntohs(pkt.seq); |
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124 if (!rtp_start_flag) { |
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125 printf("Rx RTP stream begins with seq=%u ts=%u\n", |
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126 rtp_last_seq, rtp_last_ts); |
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127 rtp_start_flag = 1; |
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128 } |
8
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129 /* ignore early RTP during ringing, before answer supervision */ |
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130 if (!rtp_out_enable) |
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131 return; |
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132 /* feed samples to modem Rx */ |
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133 for (n = 0; n < FRAME_20MS; n++) |
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134 pcm_samples[n] = pcm_dec_table[pkt.payload[n]]; |
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135 process_rx_frame(pcm_samples); |
0
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136 } |
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137 |
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138 void |
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139 rtcp_rx_select() |
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140 { |
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141 u_char buf[512]; |
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142 |
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143 recv(rtcp_udp_fd, buf, sizeof buf, 0); |
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144 if (!got_some_rtcp) { |
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145 printf("Got some RTCP\n"); |
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146 got_some_rtcp = 1; |
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147 } |
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148 } |