FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/sdp_in.c @ 275:def9f6e4f49e default tip

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doc/Use-outside-USA: Fake-NANP-numbers article is here
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 27 Nov 2023 21:49:19 -0800
parents 10a4b0b0a239
children
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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 got_sdp_answer, 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 return;
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48 rc = parse_incoming_sdp(msg->msg_body, msg->msg_body_len, &sdp_parse);
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49 if (rc < 0) {
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50 printf("SDP parse error: %d\n", rc);
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51 return;
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52 }
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53 switch (sdp_parse.codec_mask) {
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54 case SDP_CODEC_MASK_PCMU:
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55 case SDP_CODEC_MASK_BOTH:
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56 pcma_selected = 0;
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57 break;
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58 case SDP_CODEC_MASK_PCMA:
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59 case SDP_CODEC_MASK_BOTH | SDP_CODEC_MASK_PCMA_PREF:
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60 pcma_selected = 1;
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61 break;
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62 default:
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63 printf("SDP error: no supported codec\n");
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64 return;
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65 }
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66 printf("SDP response: IP %s port %u codec %s\n",
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67 inet_ntoa(sdp_parse.ip_addr), sdp_parse.audio_port,
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68 pcma_selected ? "PCMA" : "PCMU");
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69 rtp_remote_addr.sin_family = AF_INET;
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70 rtp_remote_addr.sin_addr = sdp_parse.ip_addr;
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71 rtp_remote_addr.sin_port = htons(sdp_parse.audio_port);
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72 got_sdp_answer = 1;
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73 }
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74
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75 void
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76 invite_200_rtpout()
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77 {
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78 if (!got_sdp_answer) {
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79 printf("INVITE response has no SDP!\n");
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80 return;
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81 }
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82 rtp_out_enable = 1;
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83 assign_rtpout_ssrc();
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84 init_pcm_fill_octet();
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85 prepare_tfo_fill();
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86 }