FreeCalypso > hg > sipout-test-utils

annotate test-fsk/rtp_rx.c @ 6:ba66d297fe57

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test-fsk: first attempt at modem Rx
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 04 Mar 2024 23:21:07 -0800
parents cc997f9ae186
children eaf0e8f81a22
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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5 */
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6
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7 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <sys/socket.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <netinet/in.h>
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10 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
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15 #include "../include/tmgw_const.h"
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include "../include/rtp_defs.h"
6
ba66d297fe57 test-fsk: first attempt at modem Rx
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parents: 3
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17 #include "../include/pstn_defs.h"
0
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18 #include "../librtpalloc/rtp_alloc_simple.h"
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19
6
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
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20 extern const uint16_t pcmu_decode_table[256];
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
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21 extern const uint16_t pcma_decode_table[256];
ba66d297fe57 test-fsk: first attempt at modem Rx
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22
0
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23 struct sockaddr_in rtp_local_addr;
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Mychaela Falconia <falcon@freecalypso.org>
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24 int rtp_udp_fd, rtcp_udp_fd;
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25
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26 static int rtp_start_flag, rtp_bad_flag, rtp_ssrc_chg_flag;
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Mychaela Falconia <falcon@freecalypso.org>
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27 static int rtp_seq_brk_flag, rtp_seq_zero_flag, rtp_seq_neg_flag;
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28 static int rtp_ts_brk_flag;
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Mychaela Falconia <falcon@freecalypso.org>
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29 static uint32_t rtp_ssrc;
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Mychaela Falconia <falcon@freecalypso.org>
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30 static uint32_t rtp_last_ts;
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Mychaela Falconia <falcon@freecalypso.org>
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31 static uint16_t rtp_last_seq;
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Mychaela Falconia <falcon@freecalypso.org>
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32 static int got_some_rtcp;
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Mychaela Falconia <falcon@freecalypso.org>
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33
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34 void
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Mychaela Falconia <falcon@freecalypso.org>
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35 obtain_rtp_endp()
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Mychaela Falconia <falcon@freecalypso.org>
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36 {
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Mychaela Falconia <falcon@freecalypso.org>
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37 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
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38 struct rtp_alloc_simple res;
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Mychaela Falconia <falcon@freecalypso.org>
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39
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Mychaela Falconia <falcon@freecalypso.org>
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40 rc = rtp_alloc_simple(TMGW_EP_TYPE_PSTN_ONLY, &res);
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Mychaela Falconia <falcon@freecalypso.org>
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41 if (rc < 0)
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Mychaela Falconia <falcon@freecalypso.org>
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42 exit(1); /* error msg already printed */
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Mychaela Falconia <falcon@freecalypso.org>
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43 bcopy(&res.pstn_addr, &rtp_local_addr, sizeof(struct sockaddr_in));
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Mychaela Falconia <falcon@freecalypso.org>
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44 rtp_udp_fd = res.pstn_rtp_fd;
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Mychaela Falconia <falcon@freecalypso.org>
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45 rtcp_udp_fd = res.pstn_rtcp_fd;
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Mychaela Falconia <falcon@freecalypso.org>
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46 }
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Mychaela Falconia <falcon@freecalypso.org>
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47
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Mychaela Falconia <falcon@freecalypso.org>
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48 void
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Mychaela Falconia <falcon@freecalypso.org>
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49 rtp_rx_select()
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Mychaela Falconia <falcon@freecalypso.org>
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50 {
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Mychaela Falconia <falcon@freecalypso.org>
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51 struct rtp_packet pkt;
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Mychaela Falconia <falcon@freecalypso.org>
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52 struct sockaddr_in sin_from;
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Mychaela Falconia <falcon@freecalypso.org>
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53 socklen_t addrlen;
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Mychaela Falconia <falcon@freecalypso.org>
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54 int16_t seq_delta;
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55 int32_t ts_delta;
6
ba66d297fe57 test-fsk: first attempt at modem Rx
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56 const uint16_t *pcm_dec_table;
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
parents: 3
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57 int16_t pcm_samples[FRAME_20MS];
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
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58 unsigned n;
0
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59 int rc;
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60
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61 addrlen = sizeof(struct sockaddr_in);
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62 rc = recvfrom(rtp_udp_fd, &pkt, sizeof pkt, 0,
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63 (struct sockaddr *) &sin_from, &addrlen);
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64 if (rc < 0)
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Mychaela Falconia <falcon@freecalypso.org>
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65 return;
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Mychaela Falconia <falcon@freecalypso.org>
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66 if (rc != RTP_PACKET_SIZE_PSTN) {
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Mychaela Falconia <falcon@freecalypso.org>
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67 bad_rtp_pkt: if (!rtp_bad_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
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68 printf("Got a bad RTP packet\n");
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Mychaela Falconia <falcon@freecalypso.org>
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69 rtp_bad_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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70 }
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71 return;
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Mychaela Falconia <falcon@freecalypso.org>
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72 }
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Mychaela Falconia <falcon@freecalypso.org>
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73 if (pkt.v_p_x_cc != 0x80)
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74 goto bad_rtp_pkt;
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75 switch (pkt.m_pt & 0x7F) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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76 case PSTN_CODEC_PCMU:
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77 pcm_dec_table = pcmu_decode_table;
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
parents: 3
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78 break;
0
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Mychaela Falconia <falcon@freecalypso.org>
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79 case PSTN_CODEC_PCMA:
6
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Mychaela Falconia <falcon@freecalypso.org>
parents: 3
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80 pcm_dec_table = pcma_decode_table;
0
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parents:
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81 break;
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Mychaela Falconia <falcon@freecalypso.org>
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82 default:
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Mychaela Falconia <falcon@freecalypso.org>
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83 goto bad_rtp_pkt;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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84 }
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Mychaela Falconia <falcon@freecalypso.org>
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85 if (rtp_start_flag && pkt.ssrc != rtp_ssrc) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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86 if (!rtp_ssrc_chg_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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87 printf("Rx RTP stream changed SSRC\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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88 rtp_ssrc_chg_flag = 1;
35c0d9f03c0a beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
parents:
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89 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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90 } else if (rtp_start_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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91 seq_delta = ntohs(pkt.seq) - rtp_last_seq;
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92 ts_delta = ntohl(pkt.tstamp) - rtp_last_ts;
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93 if (seq_delta == 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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94 if (!rtp_seq_zero_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 printf("Rx RTP seq zero increment\n");
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Mychaela Falconia <falcon@freecalypso.org>
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96 rtp_seq_zero_flag = 1;
35c0d9f03c0a beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
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97 }
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Mychaela Falconia <falcon@freecalypso.org>
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98 return;
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Mychaela Falconia <falcon@freecalypso.org>
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99 }
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Mychaela Falconia <falcon@freecalypso.org>
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100 if (seq_delta < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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101 if (!rtp_seq_neg_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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102 printf("Rx RTP seq negative increment\n");
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Mychaela Falconia <falcon@freecalypso.org>
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103 rtp_seq_neg_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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104 }
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105 return;
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Mychaela Falconia <falcon@freecalypso.org>
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106 }
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Mychaela Falconia <falcon@freecalypso.org>
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107 if (seq_delta != 1) {
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Mychaela Falconia <falcon@freecalypso.org>
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108 if (!rtp_seq_brk_flag) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 printf("Rx RTP stream seq break\n");
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Mychaela Falconia <falcon@freecalypso.org>
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110 rtp_seq_brk_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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111 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 } else if (ts_delta != 160) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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113 if (!rtp_ts_brk_flag) {
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114 printf("Rx RTP stream tstamp break\n");
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Mychaela Falconia <falcon@freecalypso.org>
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115 rtp_ts_brk_flag = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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116 }
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Mychaela Falconia <falcon@freecalypso.org>
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117 }
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Mychaela Falconia <falcon@freecalypso.org>
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118 }
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Mychaela Falconia <falcon@freecalypso.org>
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119 rtp_ssrc = pkt.ssrc;
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120 rtp_last_ts = ntohl(pkt.tstamp);
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121 rtp_last_seq = ntohs(pkt.seq);
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Mychaela Falconia <falcon@freecalypso.org>
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122 if (!rtp_start_flag) {
35c0d9f03c0a beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
parents:
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123 printf("Rx RTP stream begins with seq=%u ts=%u\n",
35c0d9f03c0a beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
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124 rtp_last_seq, rtp_last_ts);
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Mychaela Falconia <falcon@freecalypso.org>
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125 rtp_start_flag = 1;
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126 }
6
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
parents: 3
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127 for (n = 0; n < FRAME_20MS; n++)
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
parents: 3
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128 pcm_samples[n] = pcm_dec_table[pkt.payload[n]];
ba66d297fe57 test-fsk: first attempt at modem Rx
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
129 process_rx_frame(pcm_samples);
0
35c0d9f03c0a beginning with sipout-test-voice,
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 }
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parents:
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131
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132 void
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Mychaela Falconia <falcon@freecalypso.org>
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133 rtcp_rx_select()
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Mychaela Falconia <falcon@freecalypso.org>
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134 {
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Mychaela Falconia <falcon@freecalypso.org>
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135 u_char buf[512];
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parents:
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136
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Mychaela Falconia <falcon@freecalypso.org>
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137 recv(rtcp_udp_fd, buf, sizeof buf, 0);
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138 if (!got_some_rtcp) {
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Mychaela Falconia <falcon@freecalypso.org>
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139 printf("Got some RTCP\n");
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Mychaela Falconia <falcon@freecalypso.org>
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140 got_some_rtcp = 1;
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Mychaela Falconia <falcon@freecalypso.org>
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141 }
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Mychaela Falconia <falcon@freecalypso.org>
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142 }