FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/sdp_in.c @ 199:e6c7ced3c031

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mgw: accept zero-length RTP payload as BFI Mainline OsmoBTS now has an option (rtp continuous-streaming) that causes it to emit an RTP packet every 20 ms without gaps, sending a BFI marker in the form of zero-length RTP payload when it has nothing else to send. These codec-independent BFI markers don't indicate TAF, but this provision is a good start. Accept this BFI packet format in themwi-mgw.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 29 Mar 2023 20:23:43 -0800
parents f8a33603288f
children d3c99b41fb04
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1 /*
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2 * In this module we handle SDP responses to our INVITE.
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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 <netinet/in.h>
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8 #include <arpa/inet.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include "../libsip/parse.h"
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14 #include "../libsip/sdp.h"
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15
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16 extern char *get_single_header();
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17 extern char *extract_to_tag();
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18
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19 struct sockaddr_in rtp_remote_addr;
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20 int pcma_selected, rtp_out_enable;
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21
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22 static
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23 check_sdp_present(msg)
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24 struct sip_pkt_rx *msg;
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25 {
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26 char *hval;
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27
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28 if (!msg->msg_body_len)
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29 return 0;
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30 hval = get_single_header(msg, "Content-Type", "c", (int *) 0);
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31 if (!hval)
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32 return 0;
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33 if (!strcasecmp(hval, "application/sdp"))
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34 return 1;
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35 else
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36 return 0;
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37 }
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38
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39 void
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40 extract_resp_sdp(msg)
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41 struct sip_pkt_rx *msg;
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42 {
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43 struct sdp_parse sdp_parse;
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44 int rc;
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45
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46 if (!check_sdp_present(msg)) {
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47 printf("INVITE response has no SDP!\n");
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48 return;
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49 }
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50 rc = parse_incoming_sdp(msg->msg_body, msg->msg_body_len, &sdp_parse);
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51 if (rc < 0) {
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52 printf("SDP parse error: %d\n", rc);
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53 return;
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54 }
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55 switch (sdp_parse.codec_mask) {
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56 case SDP_CODEC_MASK_PCMU:
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57 case SDP_CODEC_MASK_BOTH:
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58 pcma_selected = 0;
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59 break;
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60 case SDP_CODEC_MASK_PCMA:
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61 case SDP_CODEC_MASK_BOTH | SDP_CODEC_MASK_PCMA_PREF:
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62 pcma_selected = 1;
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63 break;
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64 default:
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65 printf("SDP error: no supported codec\n");
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66 return;
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67 }
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68 printf("SDP response: IP %s port %u codec %s\n",
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69 inet_ntoa(sdp_parse.ip_addr), sdp_parse.audio_port,
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70 pcma_selected ? "PCMA" : "PCMU");
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71 rtp_remote_addr.sin_family = AF_INET;
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72 rtp_remote_addr.sin_addr = sdp_parse.ip_addr;
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73 rtp_remote_addr.sin_port = htons(sdp_parse.audio_port);
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74 rtp_out_enable = 1;
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75 assign_rtpout_ssrc();
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76 }