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annotate libsip/sdp_gen.c @ 54:9f045dcff60e

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libsip: SDP generation implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 08 Sep 2022 12:02:22 -0800
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54
9f045dcff60e libsip: SDP generation implemented
Mychaela Falconia <falcon@freecalypso.org>
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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 }