FreeCalypso > hg > sipout-test-utils
view libsip/sdp_parse.c @ 13:059b79c9f0c3
sipout-test-voice: add DMW output mode
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 07 Apr 2024 17:09:32 -0800 |
parents | 35c0d9f03c0a |
children |
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/* * Here we implement the function that parses received SDP descriptions. */ #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <ctype.h> #include <string.h> #include <strings.h> #include <stdlib.h> #include "../include/tmgw_const.h" #include "sdp.h" parse_incoming_sdp(body, bodylen, dist) char *body; unsigned bodylen; struct sdp_parse *dist; { char *cp, *endp; int got_c = 0, got_m = 0, prefer_pcma = 0; unsigned codec; cp = body; endp = body + bodylen; while (cp < endp) { if (!islower(cp[0]) || cp[1] != '=') return(-1); switch (cp[0]) { case 'c': if (got_c) return(-1); got_c = 1; if (strncmp(cp + 2, "IN IP4 ", 7)) return(-1); cp += 9; dist->ip_addr.s_addr = inet_addr(cp); if (dist->ip_addr.s_addr == INADDR_NONE) return(-1); break; case 'm': if (got_m) return(-1); got_m = 1; if (strncmp(cp + 2, "audio ", 6)) return(-1); cp += 8; if (!isdigit(*cp)) return(-1); dist->audio_port = strtoul(cp, &cp, 10); if (strncmp(cp, " RTP/AVP", 8)) return(-1); cp += 8; dist->codec_mask = 0; for (;;) { if (*cp == '\r' || *cp == '\n') break; if (*cp++ != ' ') return(-1); codec = strtoul(cp, &cp, 10); switch (codec) { case PSTN_CODEC_PCMU: dist->codec_mask |= SDP_CODEC_MASK_PCMU; break; case PSTN_CODEC_PCMA: if (!dist->codec_mask) prefer_pcma = 1; dist->codec_mask |= SDP_CODEC_MASK_PCMA; break; } } if (dist->codec_mask == SDP_CODEC_MASK_BOTH && prefer_pcma) dist->codec_mask |= SDP_CODEC_MASK_PCMA_PREF; break; default: cp += 2; } for (;;) { if (cp >= endp) return(-1); if (!*cp) return(-1); if (*cp == '\n') { cp++; break; } if (*cp == '\r') { cp++; if (cp >= endp) return(-1); if (*cp++ != '\n') return(-1); break; } cp++; } } if (got_c && got_m) return(0); else return(-1); }