FreeCalypso > hg > themwi-system-sw
annotate libsip/sdp_parse.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 | bea761629c5b |
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rev | line source |
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1 /* |
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2 * Here we implement the function that parses received 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 <ctype.h> |
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10 #include <string.h> |
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11 #include <strings.h> |
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12 #include <stdlib.h> |
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13 #include "../include/tmgw_const.h" |
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14 #include "sdp.h" |
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15 |
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16 parse_incoming_sdp(body, bodylen, dist) |
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17 char *body; |
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18 unsigned bodylen; |
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19 struct sdp_parse *dist; |
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20 { |
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21 char *cp, *endp; |
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22 int got_c = 0, got_m = 0, prefer_pcma = 0; |
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23 unsigned codec; |
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24 |
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25 cp = body; |
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26 endp = body + bodylen; |
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27 while (cp < endp) { |
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28 if (!islower(cp[0]) || cp[1] != '=') |
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29 return(-1); |
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30 switch (cp[0]) { |
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31 case 'c': |
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32 if (got_c) |
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33 return(-1); |
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34 got_c = 1; |
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35 if (strncmp(cp + 2, "IN IP4 ", 7)) |
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36 return(-1); |
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37 cp += 9; |
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38 dist->ip_addr.s_addr = inet_addr(cp); |
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39 if (dist->ip_addr.s_addr == INADDR_NONE) |
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40 return(-1); |
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41 break; |
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42 case 'm': |
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43 if (got_m) |
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44 return(-1); |
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45 got_m = 1; |
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46 if (strncmp(cp + 2, "audio ", 6)) |
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47 return(-1); |
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48 cp += 8; |
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49 if (!isdigit(*cp)) |
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50 return(-1); |
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51 dist->audio_port = strtoul(cp, &cp, 10); |
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52 if (strncmp(cp, " RTP/AVP", 8)) |
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53 return(-1); |
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54 cp += 8; |
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55 dist->codec_mask = 0; |
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56 for (;;) { |
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57 if (*cp == '\r' || *cp == '\n') |
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58 break; |
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59 if (*cp++ != ' ') |
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60 return(-1); |
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61 codec = strtoul(cp, &cp, 10); |
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62 switch (codec) { |
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63 case PSTN_CODEC_PCMU: |
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64 dist->codec_mask |= SDP_CODEC_MASK_PCMU; |
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65 break; |
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66 case PSTN_CODEC_PCMA: |
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67 if (!dist->codec_mask) |
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68 prefer_pcma = 1; |
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69 dist->codec_mask |= SDP_CODEC_MASK_PCMA; |
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70 break; |
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71 } |
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72 } |
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73 if (dist->codec_mask == SDP_CODEC_MASK_BOTH && |
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74 prefer_pcma) |
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75 dist->codec_mask |= SDP_CODEC_MASK_PCMA_PREF; |
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76 break; |
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77 default: |
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78 cp += 2; |
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79 } |
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80 for (;;) { |
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81 if (cp >= endp) |
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82 return(-1); |
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83 if (!*cp) |
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84 return(-1); |
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85 if (*cp == '\n') { |
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86 cp++; |
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87 break; |
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88 } |
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89 if (*cp == '\r') { |
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90 cp++; |
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91 if (cp >= endp) |
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92 return(-1); |
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93 if (*cp++ != '\n') |
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94 return(-1); |
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95 break; |
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96 } |
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97 cp++; |
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98 } |
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99 } |
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100 if (got_c && got_m) |
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101 return(0); |
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102 else |
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103 return(-1); |
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104 } |