FreeCalypso > hg > themwi-rtp-lib

annotate src/rtcp_tx.c @ 42:334d883b96ba

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twrtp_jibuf_create: make config argument const While this config structure is not a constant in the mathematical sense of the term (it is expected that vty config changes may happen while twjit instance is alive), twjit functions never write to it, only read, hence it is 'const' in the not-quite-mathematical C-standard sense.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 20 Dec 2024 22:47:20 +0000
parents fc77c3482084
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
32
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1 /*
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2 * Here we implement RTCP Tx functionality.
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3 */
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4
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5 #include <stdint.h>
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6 #include <stdbool.h>
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7 #include <string.h>
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8 #include <errno.h>
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9 #include <arpa/inet.h> /* for network byte order functions */
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10
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11 #include <osmocom/core/msgb.h>
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12 #include <osmocom/core/osmo_io.h>
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13 #include <osmocom/core/timer.h>
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14
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15 #include <themwi/rtp/endp.h>
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16 #include <themwi/rtp/rtcp_defs.h>
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17 #include <themwi/rtp/twjit.h>
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18 #include "endp_internal.h"
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19
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20 #define NTP_EPOCH_MJD 15020
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21 #define UNIX_EPOCH_MJD 40587
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22
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23 #define NTP_UNIX_EPOCH_DIFF ((UNIX_EPOCH_MJD-NTP_EPOCH_MJD) * 86400UL)
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24 #define TWO_TO_32_DOUBLE 4294967296.0
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25
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26 static void fill_rr_block(struct twrtp_endp *endp, struct rtcp_rr_block *rr)
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27 {
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28 struct twrtp_jibuf_inst *twjit = endp->twjit;
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29 struct twrtp_jibuf_rr_info *rri = &twjit->rr_info;
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30 struct twrtp_endp_rtcp_rx *rxs = &endp->rtcp_rx;
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31 struct twrtp_endp_rtcp_tx *txs = &endp->rtcp_tx;
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32 uint32_t delta_expect, delta_rcvd;
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33 int32_t cumulative_lost, newly_lost;
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34 uint32_t lost_fract, lost_word;
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35 struct timespec now, time_delta;
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36
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37 cumulative_lost = (int32_t)(rri->expected_pkt - rri->rx_packets);
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38 if (cumulative_lost > 0x7FFFFF)
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39 cumulative_lost = 0x7FFFFF;
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40 else if (cumulative_lost < -0x800000)
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41 cumulative_lost = -0x800000;
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42 delta_expect = rri->expected_pkt - txs->last_expected;
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43 txs->last_expected = rri->expected_pkt;
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44 delta_rcvd = rri->rx_packets - txs->last_received;
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45 txs->last_received = rri->rx_packets;
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46 newly_lost = (int32_t)(delta_expect - delta_rcvd);
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47 if (delta_expect == 0 || newly_lost <= 0)
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48 lost_fract = 0;
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49 else
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50 lost_fract = (newly_lost << 8) / delta_expect;
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51 lost_word = (lost_fract << 8) | (cumulative_lost & 0xFFFFFF);
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52
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53 rr->ssrc = htonl(twjit->last_ssrc);
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54 rr->lost_word = htonl(lost_word);
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55 rr->max_seq_ext = htonl(rri->max_seq_ext);
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56 rr->jitter = htonl(rri->jitter_accum >> 4);
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57
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58 if (rxs->got_sr && rxs->sr_ssrc == twjit->last_ssrc) {
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59 osmo_clock_gettime(CLOCK_MONOTONIC, &now);
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60 time_delta.tv_sec = now.tv_sec - rxs->sr_rx_time.tv_sec;
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61 time_delta.tv_nsec = now.tv_nsec - rxs->sr_rx_time.tv_nsec;
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62 if (time_delta.tv_nsec < 0) {
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63 time_delta.tv_sec--;
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64 time_delta.tv_nsec += 1000000000;
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65 }
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66 rr->lsr_sec = htons(rxs->sr_ntp_sec);
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67 rr->lsr_fract = htons(rxs->sr_ntp_fract);
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68 rr->dlsr_sec = htons(time_delta.tv_sec);
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69 rr->dlsr_fract = htons(time_delta.tv_nsec / 1000000000.0f *
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70 65536.0f);
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71 } else {
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72 rr->lsr_sec = 0;
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73 rr->lsr_fract = 0;
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74 rr->dlsr_sec = 0;
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75 rr->dlsr_fract = 0;
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76 }
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77 }
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78
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79 int _twrtp_endp_send_rtcp(struct twrtp_endp *endp, bool send_sr,
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80 const struct timespec *utc, uint32_t rtp_ts)
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81 {
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82 bool send_rr = endp->twjit->got_first_packet;
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83 struct msgb *msg;
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84 struct rtcp_sr_rr_hdr *hdr;
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85 struct rtcp_sr_block *sr;
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86 struct rtcp_rr_block *rr;
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87 uint8_t *sdes_out;
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88 int rc;
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89
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90 if (!endp->register_done || !endp->remote_set || !endp->sdes_buf)
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91 return -EINVAL;
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92 if (!send_sr && !send_rr)
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93 return -ENODATA; /* nothing to send, neither SR nor RR */
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94 msg = msgb_alloc_c(endp, sizeof(struct rtcp_sr_rr_hdr) +
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95 sizeof(struct rtcp_sr_block) +
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96 sizeof(struct rtcp_rr_block) + endp->sdes_len,
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97 "ThemWi-RTCP-Tx");
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98 if (!msg)
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99 return -ENOMEM;
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100
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101 hdr = (struct rtcp_sr_rr_hdr *)
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102 msgb_put(msg, sizeof(struct rtcp_sr_rr_hdr));
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103 hdr->v_p_rc = send_rr ? 0x81 : 0x80;
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104 if (send_sr) {
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105 hdr->pt = RTCP_PT_SR;
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106 hdr->len = htons(send_rr ? 12 : 6);
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107 } else {
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108 hdr->pt = RTCP_PT_RR;
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109 hdr->len = htons(7);
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110 }
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111 hdr->ssrc = htonl(endp->tx.ssrc);
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112 if (send_sr) {
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113 sr = (struct rtcp_sr_block *)
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114 msgb_put(msg, sizeof(struct rtcp_sr_block));
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115 sr->ntp_sec = htonl(utc->tv_sec + NTP_UNIX_EPOCH_DIFF);
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116 sr->ntp_fract = htonl(utc->tv_nsec / 1000000000.0 *
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117 TWO_TO_32_DOUBLE);
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118 sr->rtp_ts = htonl(rtp_ts);
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119 sr->pkt_count = htonl(endp->stats.tx_rtp_pkt);
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120 sr->octet_count = htonl(endp->stats.tx_rtp_bytes);
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121 }
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122 if (send_rr) {
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123 rr = (struct rtcp_rr_block *)
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124 msgb_put(msg, sizeof(struct rtcp_rr_block));
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125 fill_rr_block(endp, rr);
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126 }
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127 sdes_out = msgb_put(msg, endp->sdes_len);
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128 memcpy(sdes_out, endp->sdes_buf, endp->sdes_len);
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129
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130 rc = osmo_iofd_sendto_msgb(endp->iofd_rtcp, msg, 0, &endp->rtcp_remote);
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131 if (rc < 0) {
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132 msgb_free(msg);
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133 return rc;
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134 }
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135 endp->stats.tx_rtcp_pkt++;
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136 return 0;
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137 }
34
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138
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139 int twrtp_endp_send_rtcp_rr(struct twrtp_endp *endp)
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140 {
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141 return _twrtp_endp_send_rtcp(endp, false, NULL, 0);
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142 }