FreeCalypso > hg > themwi-system-sw

annotate libsip/sdp_gen.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents 9f045dcff60e
children
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54
9f045dcff60e libsip: SDP generation implemented
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1 /*
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2 * Here we implement generation of outgoing SDP descriptions.
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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 "sdp.h"
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14 #include "out_msg.h"
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15
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16 format_sdp_in_buffer(gen, buf, lenptr)
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17 struct sdp_gen *gen;
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18 char *buf;
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19 unsigned *lenptr;
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20 {
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21 char *dp, *codec_list;
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22
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23 dp = buf;
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24 strcpy(dp, "v=0\r\n");
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25 dp += 5;
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26 sprintf(dp, "o=- %u %u IN IP4 %s\r\n", gen->session_id, gen->version,
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27 inet_ntoa(gen->owner_ip));
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28 dp = index(dp, '\0');
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29 strcpy(dp, "s=-\r\n");
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30 dp += 5;
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31 sprintf(dp, "c=IN IP4 %s\r\n", inet_ntoa(gen->conn_ip));
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32 dp = index(dp, '\0');
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33 strcpy(dp, "t=0 0\r\n");
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34 dp += 7;
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35 switch (gen->codec_mask) {
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36 case SDP_CODEC_MASK_PCMU:
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37 codec_list = "0";
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38 break;
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39 case SDP_CODEC_MASK_PCMA:
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40 codec_list = "8";
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41 break;
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42 case SDP_CODEC_MASK_BOTH:
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43 codec_list = "0 8";
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44 break;
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45 case SDP_CODEC_MASK_BOTH | SDP_CODEC_MASK_PCMA_PREF:
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46 codec_list = "8 0";
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47 break;
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48 default:
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49 return(-2);
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50 }
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51 sprintf(dp, "m=audio %u RTP/AVP %s\r\n", gen->conn_port, codec_list);
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52 dp = index(dp, '\0');
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53 if (gen->codec_mask & SDP_CODEC_MASK_PCMU) {
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54 strcpy(dp, "a=rtpmap:0 PCMU/8000\r\n");
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55 dp += 22;
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56 }
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57 if (gen->codec_mask & SDP_CODEC_MASK_PCMA) {
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58 strcpy(dp, "a=rtpmap:8 PCMA/8000\r\n");
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59 dp += 22;
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60 }
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61 strcpy(dp, "a=sendrecv\r\n");
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62 dp += 12;
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63 strcpy(dp, "a=ptime:20\r\n");
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64 dp += 12;
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65 *lenptr = (dp - buf);
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66 return(0);
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67 }
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68
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69 out_msg_finish_sdp(msg, gen)
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70 struct sip_msg_out *msg;
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71 struct sdp_gen *gen;
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72 {
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73 char sdp_buf[256];
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74 unsigned sdp_len;
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75 int rc;
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76
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77 rc = format_sdp_in_buffer(gen, sdp_buf, &sdp_len);
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78 if (rc < 0)
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79 return rc;
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80 return out_msg_finish_body(msg, sdp_buf, sdp_len);
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81 }