FreeCalypso > hg > themwi-system-sw
annotate libsip/sdp_gen.c @ 124:7e04d28fae8b
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> |
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date | Sat, 01 Oct 2022 15:54:50 -0800 |
parents | 9f045dcff60e |
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rev | line source |
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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 } |