FreeCalypso > hg > themwi-rtp-lib

annotate src/rtcp_rx.c @ 29:3e01a71b7c7c

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implement RTCP Rx
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 08 Jul 2024 02:55:32 +0000
parents src/rtp_rx.c@9e477a4b485a
children
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1 /*
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2 * Here we implement RTCP Rx path via osmo_io callback.
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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 <arpa/inet.h> /* for network byte order functions */
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8
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9 #include <osmocom/core/msgb.h>
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10 #include <osmocom/core/osmo_io.h>
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11 #include <osmocom/core/socket.h>
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12 #include <osmocom/core/timer.h>
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14 #include <themwi/rtp/endp.h>
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15 #include <themwi/rtp/rtcp_defs.h>
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16 #include "endp_internal.h"
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17
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18 static void parse_rtcp(struct twrtp_endp *endp, struct msgb *msg)
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19 {
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20 struct twrtp_endp_rtcp_rx *rxs = &endp->rtcp_rx;
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21 struct rtcp_sr_rr_hdr *base_hdr;
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22 struct rtcp_sr_block *sr;
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23 struct rtcp_rr_block *rr;
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24 unsigned rc, i;
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26 if (msg->len < sizeof(struct rtcp_sr_rr_hdr)) {
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27 invalid: endp->stats.rx_rtcp_invalid++;
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28 return;
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29 }
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30 base_hdr = (struct rtcp_sr_rr_hdr *)
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31 msgb_pull(msg, sizeof(struct rtcp_sr_rr_hdr));
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32 if ((base_hdr->v_p_rc & 0xC0) != 0x80)
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33 goto invalid;
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34 switch (base_hdr->pt) {
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35 case RTCP_PT_SR:
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36 if (msg->len < sizeof(struct rtcp_sr_block))
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37 goto invalid;
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38 sr = (struct rtcp_sr_block *)
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39 msgb_pull(msg, sizeof(struct rtcp_sr_block));
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40 rxs->got_sr = true;
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41 osmo_clock_gettime(CLOCK_MONOTONIC, &rxs->sr_rx_time);
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42 rxs->sr_ssrc = ntohl(base_hdr->ssrc);
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43 rxs->sr_ntp_sec = ntohl(sr->ntp_sec);
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44 rxs->sr_ntp_fract = ntohl(sr->ntp_fract) >> 16;
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45 break;
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46 case RTCP_PT_RR:
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47 break;
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48 default:
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49 goto invalid;
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50 }
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51 rc = base_hdr->v_p_rc & 0x1F;
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52 if (msg->len < sizeof(struct rtcp_rr_block) * rc)
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53 goto invalid;
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54 for (i = 0; i < rc; i++) {
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55 rr = (struct rtcp_rr_block *)
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56 msgb_pull(msg, sizeof(struct rtcp_rr_block));
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57 if (ntohl(rr->ssrc) != endp->tx.ssrc) {
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58 endp->stats.rx_rtcp_wrong_ssrc++;
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59 continue;
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60 }
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61 rxs->got_rr = true;
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62 rxs->rr_lost_word = ntohl(rr->lost_word);
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63 rxs->rr_jitter = ntohl(rr->jitter);
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64 }
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65 }
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67 static void rtcp_rx_cb(struct osmo_io_fd *iofd, int res, struct msgb *msg,
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68 const struct osmo_sockaddr *saddr)
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69 {
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70 struct twrtp_endp *endp = osmo_iofd_get_data(iofd);
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71
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72 if (!msg)
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73 return;
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74 if (!endp->remote_set) {
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75 msgb_free(msg);
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76 return;
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77 }
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78 if (osmo_sockaddr_cmp(saddr, &endp->rtcp_remote)) {
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79 endp->stats.rx_rtcp_badsrc++;
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80 msgb_free(msg);
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81 return;
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82 }
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83 endp->stats.rx_rtcp_pkt++;
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84 parse_rtcp(endp, msg);
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85 msgb_free(msg);
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86 }
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87
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88 const struct osmo_io_ops _twrtp_endp_iops_rtcp = {
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89 .recvfrom_cb = rtcp_rx_cb,
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90 };