FreeCalypso > hg > themwi-system-sw
annotate libsip/sdp_gen.c @ 188:6aecee01cf0a
sip-manual-out: add RTP stream continuity analysis
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 17 Mar 2023 01:14:57 -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 } |