/* $Id$ */ /* * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) * Copyright (C) 2003-2008 Benny Prijono * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include #include #include #include #include enum { SKIP_WS = 0, SYNTAX_ERROR = 1, }; // New token definition from RFC 4566 (SDP) #define TOKEN "!#$%&'*+-.^_`{|}~" //#define TOKEN "-.!%*_=`'~" //#define TOKEN "'`-./:?\"#$&*;=@[]^_`{|}+~!" #define NTP_OFFSET ((pj_uint32_t)2208988800) #define THIS_FILE "sdp.c" typedef struct parse_context { pj_status_t last_error; } parse_context; /* * Prototypes for line parser. */ static void parse_version(pj_scanner *scanner, parse_context *ctx); static void parse_origin(pj_scanner *scanner, pjmedia_sdp_session *ses, parse_context *ctx); static void parse_time(pj_scanner *scanner, pjmedia_sdp_session *ses, parse_context *ctx); static void parse_generic_line(pj_scanner *scanner, pj_str_t *str, parse_context *ctx); static void parse_connection_info(pj_scanner *scanner, pjmedia_sdp_conn *conn, parse_context *ctx); static void parse_bandwidth_info(pj_scanner *scanner, pjmedia_sdp_bandw *bandw, parse_context *ctx); static pjmedia_sdp_attr *parse_attr(pj_pool_t *pool, pj_scanner *scanner, parse_context *ctx); static void parse_media(pj_scanner *scanner, pjmedia_sdp_media *med, parse_context *ctx); static void on_scanner_error(pj_scanner *scanner); /* * Scanner character specification. */ static int is_initialized; static pj_cis_buf_t cis_buf; static pj_cis_t cs_digit, cs_token; static void init_sdp_parser(void) { if (is_initialized != 0) return; pj_enter_critical_section(); if (is_initialized != 0) { pj_leave_critical_section(); return; } pj_cis_buf_init(&cis_buf); pj_cis_init(&cis_buf, &cs_token); pj_cis_add_alpha(&cs_token); pj_cis_add_num(&cs_token); pj_cis_add_str(&cs_token, TOKEN); pj_cis_init(&cis_buf, &cs_digit); pj_cis_add_num(&cs_digit); is_initialized = 1; pj_leave_critical_section(); } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_attr_create( pj_pool_t *pool, const char *name, const pj_str_t *value) { pjmedia_sdp_attr *attr; PJ_ASSERT_RETURN(pool && name, NULL); attr = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_attr); pj_strdup2(pool, &attr->name, name); if (value) pj_strdup_with_null(pool, &attr->value, value); else { attr->value.ptr = NULL; attr->value.slen = 0; } return attr; } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_attr_clone(pj_pool_t *pool, const pjmedia_sdp_attr *rhs) { pjmedia_sdp_attr *attr; PJ_ASSERT_RETURN(pool && rhs, NULL); attr = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_attr); pj_strdup(pool, &attr->name, &rhs->name); pj_strdup_with_null(pool, &attr->value, &rhs->value); return attr; } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_attr_find (unsigned count, pjmedia_sdp_attr *const attr_array[], const pj_str_t *name, const pj_str_t *c_fmt) { unsigned i; unsigned c_pt = 0xFFFF; PJ_ASSERT_RETURN(count <= PJMEDIA_MAX_SDP_ATTR, NULL); if (c_fmt) c_pt = pj_strtoul(c_fmt); for (i=0; iname, name) == 0) { const pjmedia_sdp_attr *a = attr_array[i]; if (c_fmt) { unsigned pt = (unsigned) pj_strtoul2(&a->value, NULL, 10); if (pt == c_pt) { return (pjmedia_sdp_attr*)a; } } else return (pjmedia_sdp_attr*)a; } } return NULL; } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_attr_find2(unsigned count, pjmedia_sdp_attr *const attr_array[], const char *c_name, const pj_str_t *c_fmt) { pj_str_t name; name.ptr = (char*)c_name; name.slen = pj_ansi_strlen(c_name); return pjmedia_sdp_attr_find(count, attr_array, &name, c_fmt); } PJ_DEF(pj_status_t) pjmedia_sdp_attr_add(unsigned *count, pjmedia_sdp_attr *attr_array[], pjmedia_sdp_attr *attr) { PJ_ASSERT_RETURN(count && attr_array && attr, PJ_EINVAL); PJ_ASSERT_RETURN(*count < PJMEDIA_MAX_SDP_ATTR, PJ_ETOOMANY); attr_array[*count] = attr; (*count)++; return PJ_SUCCESS; } PJ_DEF(unsigned) pjmedia_sdp_attr_remove_all(unsigned *count, pjmedia_sdp_attr *attr_array[], const char *name) { unsigned i, removed = 0; pj_str_t attr_name; PJ_ASSERT_RETURN(count && attr_array && name, PJ_EINVAL); PJ_ASSERT_RETURN(*count <= PJMEDIA_MAX_SDP_ATTR, PJ_ETOOMANY); attr_name.ptr = (char*)name; attr_name.slen = pj_ansi_strlen(name); for (i=0; i<*count; ) { if (pj_strcmp(&attr_array[i]->name, &attr_name)==0) { pj_array_erase(attr_array, sizeof(pjmedia_sdp_attr*), *count, i); --(*count); ++removed; } else { ++i; } } return removed; } PJ_DEF(pj_status_t) pjmedia_sdp_attr_remove( unsigned *count, pjmedia_sdp_attr *attr_array[], pjmedia_sdp_attr *attr ) { unsigned i, removed=0; PJ_ASSERT_RETURN(count && attr_array && attr, PJ_EINVAL); PJ_ASSERT_RETURN(*count <= PJMEDIA_MAX_SDP_ATTR, PJ_ETOOMANY); for (i=0; i<*count; ) { if (attr_array[i] == attr) { pj_array_erase(attr_array, sizeof(pjmedia_sdp_attr*), *count, i); --(*count); ++removed; } else { ++i; } } return removed ? PJ_SUCCESS : PJ_ENOTFOUND; } PJ_DEF(pj_status_t) pjmedia_sdp_attr_get_rtpmap( const pjmedia_sdp_attr *attr, pjmedia_sdp_rtpmap *rtpmap) { pj_scanner scanner; pj_str_t token; pj_status_t status = -1; char term = 0; PJ_USE_EXCEPTION; PJ_ASSERT_RETURN(pj_strcmp2(&attr->name, "rtpmap")==0, PJ_EINVALIDOP); if (attr->value.slen == 0) return PJMEDIA_SDP_EINATTR; init_sdp_parser(); /* Check if input is null terminated, and null terminate if * necessary. Unfortunately this may crash the application if * attribute was allocated from a read-only memory location. * But this shouldn't happen as attribute's value normally is * null terminated. */ if (attr->value.ptr[attr->value.slen] != 0 && attr->value.ptr[attr->value.slen] != '\r' && attr->value.ptr[attr->value.slen] != '\n') { pj_assert(!"Shouldn't happen"); term = attr->value.ptr[attr->value.slen]; attr->value.ptr[attr->value.slen] = '\0'; } /* The buffer passed to the scanner is not guaranteed to be NULL * terminated, but should be safe. See ticket #2063. */ pj_scan_init(&scanner, (char*)attr->value.ptr, attr->value.slen, PJ_SCAN_AUTOSKIP_WS, &on_scanner_error); /* rtpmap sample: * a=rtpmap:98 L16/16000/2. */ /* Init */ rtpmap->pt.slen = rtpmap->param.slen = rtpmap->enc_name.slen = 0; rtpmap->clock_rate = 0; /* Parse */ PJ_TRY { /* Get payload type. */ pj_scan_get(&scanner, &cs_token, &rtpmap->pt); /* Get encoding name. */ pj_scan_get(&scanner, &cs_token, &rtpmap->enc_name); /* Expecting '/' after encoding name. */ if (pj_scan_get_char(&scanner) != '/') { status = PJMEDIA_SDP_EINRTPMAP; goto on_return; } /* Get the clock rate. */ pj_scan_get(&scanner, &cs_digit, &token); rtpmap->clock_rate = pj_strtoul(&token); /* Expecting either '/' or EOF */ if (*scanner.curptr == '/') { pj_scan_get_char(&scanner); rtpmap->param.ptr = scanner.curptr; rtpmap->param.slen = scanner.end - scanner.curptr; } else { rtpmap->param.slen = 0; } status = PJ_SUCCESS; } PJ_CATCH_ANY { status = PJMEDIA_SDP_EINRTPMAP; } PJ_END; on_return: pj_scan_fini(&scanner); if (term) { attr->value.ptr[attr->value.slen] = term; } return status; } PJ_DEF(pj_status_t) pjmedia_sdp_attr_get_fmtp( const pjmedia_sdp_attr *attr, pjmedia_sdp_fmtp *fmtp) { const char *p = attr->value.ptr; const char *end = attr->value.ptr + attr->value.slen; pj_str_t token; PJ_ASSERT_RETURN(pj_strcmp2(&attr->name, "fmtp")==0, PJ_EINVALIDOP); if (attr->value.slen == 0) return PJMEDIA_SDP_EINATTR; /* fmtp BNF: * a=fmtp: */ /* Get format. */ token.ptr = (char*)p; while (pj_isdigit(*p) && p!=end) ++p; token.slen = p - token.ptr; if (token.slen == 0) return PJMEDIA_SDP_EINFMTP; fmtp->fmt = token; /* Expecting space after format. */ if (*p != ' ') return PJMEDIA_SDP_EINFMTP; /* Get space. */ ++p; /* Set the remaining string as fmtp format parameter. */ fmtp->fmt_param.ptr = (char*)p; fmtp->fmt_param.slen = end - p; return PJ_SUCCESS; } PJ_DEF(pj_status_t) pjmedia_sdp_attr_get_rtcp(const pjmedia_sdp_attr *attr, pjmedia_sdp_rtcp_attr *rtcp) { pj_scanner scanner; pj_str_t token; pj_status_t status = -1; PJ_USE_EXCEPTION; PJ_ASSERT_RETURN(pj_strcmp2(&attr->name, "rtcp")==0, PJ_EINVALIDOP); if (attr->value.slen == 0) return PJMEDIA_SDP_EINATTR; init_sdp_parser(); /* fmtp BNF: * a=rtcp: [nettype addrtype address] */ /* The buffer passed to the scanner is not guaranteed to be NULL * terminated, but should be safe. See ticket #2063. */ pj_scan_init(&scanner, (char*)attr->value.ptr, attr->value.slen, PJ_SCAN_AUTOSKIP_WS, &on_scanner_error); /* Init */ rtcp->net_type.slen = rtcp->addr_type.slen = rtcp->addr.slen = 0; /* Parse */ PJ_TRY { /* Get the port */ pj_scan_get(&scanner, &cs_token, &token); rtcp->port = pj_strtoul(&token); /* Have address? */ if (!pj_scan_is_eof(&scanner)) { /* Get network type */ pj_scan_get(&scanner, &cs_token, &rtcp->net_type); /* Get address type */ pj_scan_get(&scanner, &cs_token, &rtcp->addr_type); /* Get the address */ //pj_scan_get(&scanner, &cs_token, &rtcp->addr); pj_scan_get_until_chr(&scanner, "/ \t\r\n", &rtcp->addr); } status = PJ_SUCCESS; } PJ_CATCH_ANY { status = PJMEDIA_SDP_EINRTCP; } PJ_END; pj_scan_fini(&scanner); return status; } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_attr_create_rtcp(pj_pool_t *pool, const pj_sockaddr *a) { enum { ATTR_LEN = PJ_INET6_ADDRSTRLEN+16 }; char tmp_addr[PJ_INET6_ADDRSTRLEN]; pjmedia_sdp_attr *attr; attr = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_attr); attr->name = pj_str("rtcp"); attr->value.ptr = (char*) pj_pool_alloc(pool, ATTR_LEN); if (a->addr.sa_family == pj_AF_INET()) { attr->value.slen = pj_ansi_snprintf(attr->value.ptr, ATTR_LEN, "%u IN IP4 %s", pj_sockaddr_get_port(a), pj_sockaddr_print(a, tmp_addr, sizeof(tmp_addr), 0)); } else if (a->addr.sa_family == pj_AF_INET6()) { attr->value.slen = pj_ansi_snprintf(attr->value.ptr, ATTR_LEN, "%u IN IP6 %s", pj_sockaddr_get_port(a), pj_sockaddr_print(a, tmp_addr, sizeof(tmp_addr), 0)); } else { pj_assert(!"Unsupported address family"); return NULL; } return attr; } PJ_DEF(pj_status_t) pjmedia_sdp_attr_get_ssrc(const pjmedia_sdp_attr *attr, pjmedia_sdp_ssrc_attr *ssrc) { pj_scanner scanner; pj_str_t token; pj_status_t status = -1; PJ_USE_EXCEPTION; PJ_ASSERT_RETURN(pj_strcmp2(&attr->name, "ssrc")==0, PJ_EINVALIDOP); if (attr->value.slen == 0) return PJMEDIA_SDP_EINATTR; init_sdp_parser(); /* ssrc BNF: * a=ssrc: * a=ssrc: : */ /* The buffer passed to the scanner is not guaranteed to be NULL * terminated, but should be safe. See ticket #2063. */ pj_scan_init(&scanner, (char*)attr->value.ptr, attr->value.slen, PJ_SCAN_AUTOSKIP_WS, &on_scanner_error); /* Init */ pj_bzero(ssrc, sizeof(*ssrc)); /* Parse */ PJ_TRY { pj_str_t scan_attr; /* Get the ssrc */ pj_scan_get(&scanner, &cs_digit, &token); ssrc->ssrc = pj_strtoul(&token); pj_scan_get_char(&scanner); pj_scan_get(&scanner, &cs_token, &scan_attr); /* Get cname attribute, if any */ if (!pj_scan_is_eof(&scanner) && pj_scan_get_char(&scanner) == ':' && pj_strcmp2(&scan_attr, "cname")) { pj_scan_get(&scanner, &cs_token, &ssrc->cname); } status = PJ_SUCCESS; } PJ_CATCH_ANY { status = PJMEDIA_SDP_EINSSRC; } PJ_END; pj_scan_fini(&scanner); return status; } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_attr_create_ssrc( pj_pool_t *pool, pj_uint32_t ssrc, const pj_str_t *cname) { pjmedia_sdp_attr *attr; if (cname->slen == 0) return NULL; attr = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_attr); attr->name = pj_str("ssrc"); attr->value.ptr = (char*) pj_pool_alloc(pool, cname->slen+7 /* " cname:"*/ + 10 /* 32-bit integer */ + 1 /* NULL */); attr->value.slen = pj_ansi_snprintf(attr->value.ptr, cname->slen+18, "%d cname:%.*s", ssrc, (int)cname->slen, cname->ptr); return attr; } PJ_DEF(pj_status_t) pjmedia_sdp_attr_to_rtpmap(pj_pool_t *pool, const pjmedia_sdp_attr *attr, pjmedia_sdp_rtpmap **p_rtpmap) { PJ_ASSERT_RETURN(pool && attr && p_rtpmap, PJ_EINVAL); *p_rtpmap = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_rtpmap); PJ_ASSERT_RETURN(*p_rtpmap, PJ_ENOMEM); return pjmedia_sdp_attr_get_rtpmap(attr, *p_rtpmap); } PJ_DEF(pj_status_t) pjmedia_sdp_rtpmap_to_attr(pj_pool_t *pool, const pjmedia_sdp_rtpmap *rtpmap, pjmedia_sdp_attr **p_attr) { pjmedia_sdp_attr *attr; char tempbuf[128]; int len; /* Check arguments. */ PJ_ASSERT_RETURN(pool && rtpmap && p_attr, PJ_EINVAL); /* Check that mandatory attributes are specified. */ PJ_ASSERT_RETURN(rtpmap->enc_name.slen && rtpmap->clock_rate, PJMEDIA_SDP_EINRTPMAP); attr = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_attr); PJ_ASSERT_RETURN(attr != NULL, PJ_ENOMEM); attr->name.ptr = "rtpmap"; attr->name.slen = 6; /* Format: ":pt enc_name/clock_rate[/param]" */ len = pj_ansi_snprintf(tempbuf, sizeof(tempbuf), "%.*s %.*s/%u%s%.*s", (int)rtpmap->pt.slen, rtpmap->pt.ptr, (int)rtpmap->enc_name.slen, rtpmap->enc_name.ptr, rtpmap->clock_rate, (rtpmap->param.slen ? "/" : ""), (int)rtpmap->param.slen, rtpmap->param.ptr); if (len < 1 || len >= (int)sizeof(tempbuf)) return PJMEDIA_SDP_ERTPMAPTOOLONG; attr->value.slen = len; attr->value.ptr = (char*) pj_pool_alloc(pool, attr->value.slen+1); pj_memcpy(attr->value.ptr, tempbuf, attr->value.slen+1); *p_attr = attr; return PJ_SUCCESS; } static int print_connection_info( pjmedia_sdp_conn *c, char *buf, int len) { int printed; printed = pj_ansi_snprintf(buf, len, "c=%.*s %.*s %.*s\r\n", (int)c->net_type.slen, c->net_type.ptr, (int)c->addr_type.slen, c->addr_type.ptr, (int)c->addr.slen, c->addr.ptr); if (printed < 1 || printed >= len) return -1; return printed; } PJ_DEF(pjmedia_sdp_conn*) pjmedia_sdp_conn_clone (pj_pool_t *pool, const pjmedia_sdp_conn *rhs) { pjmedia_sdp_conn *c = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_conn); if (!c) return NULL; if (!pj_strdup (pool, &c->net_type, &rhs->net_type)) return NULL; if (!pj_strdup (pool, &c->addr_type, &rhs->addr_type)) return NULL; if (!pj_strdup (pool, &c->addr, &rhs->addr)) return NULL; return c; } PJ_DEF(pjmedia_sdp_bandw*) pjmedia_sdp_bandw_clone (pj_pool_t *pool, const pjmedia_sdp_bandw *rhs) { pjmedia_sdp_bandw *b = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_bandw); if (!b) return NULL; if (!pj_strdup (pool, &b->modifier, &rhs->modifier)) return NULL; b->value = rhs->value; return b; } static pj_ssize_t print_bandw(const pjmedia_sdp_bandw *bandw, char *buf, pj_size_t len) { char *p = buf; if ((int)len < bandw->modifier.slen + 10 + 5) return -1; *p++ = 'b'; *p++ = '='; pj_memcpy(p, bandw->modifier.ptr, bandw->modifier.slen); p += bandw->modifier.slen; *p++ = ':'; p += pj_utoa(bandw->value, p); *p++ = '\r'; *p++ = '\n'; return p-buf; } static pj_ssize_t print_attr(const pjmedia_sdp_attr *attr, char *buf, pj_size_t len) { char *p = buf; if ((int)len < attr->name.slen + attr->value.slen + 10) return -1; *p++ = 'a'; *p++ = '='; pj_memcpy(p, attr->name.ptr, attr->name.slen); p += attr->name.slen; if (attr->value.slen) { *p++ = ':'; pj_memcpy(p, attr->value.ptr, attr->value.slen); p += attr->value.slen; } *p++ = '\r'; *p++ = '\n'; return p-buf; } static int print_media_desc( pjmedia_sdp_media *m, char *buf, int len) { char *p = buf; char *end = buf+len; unsigned i; int printed; /* check length for the "m=" line. */ if (len < m->desc.media.slen+m->desc.transport.slen+12+24) { return -1; } *p++ = 'm'; /* m= */ *p++ = '='; pj_memcpy(p, m->desc.media.ptr, m->desc.media.slen); p += m->desc.media.slen; *p++ = ' '; printed = pj_utoa(m->desc.port, p); p += printed; if (m->desc.port_count > 1) { *p++ = '/'; printed = pj_utoa(m->desc.port_count, p); p += printed; } *p++ = ' '; pj_memcpy(p, m->desc.transport.ptr, m->desc.transport.slen); p += m->desc.transport.slen; for (i=0; idesc.fmt_count; ++i) { *p++ = ' '; pj_memcpy(p, m->desc.fmt[i].ptr, m->desc.fmt[i].slen); p += m->desc.fmt[i].slen; } *p++ = '\r'; *p++ = '\n'; /* print connection info, if present. */ if (m->conn) { printed = print_connection_info(m->conn, p, (int)(end-p)); if (printed < 0) { return -1; } p += printed; } /* print optional bandwidth info. */ for (i=0; ibandw_count; ++i) { printed = (int)print_bandw(m->bandw[i], p, end-p); if (printed < 0) { return -1; } p += printed; } /* print attributes. */ for (i=0; iattr_count; ++i) { printed = (int)print_attr(m->attr[i], p, end-p); if (printed < 0) { return -1; } p += printed; } return (int)(p-buf); } PJ_DEF(pjmedia_sdp_media*) pjmedia_sdp_media_clone( pj_pool_t *pool, const pjmedia_sdp_media *rhs) { unsigned int i; pjmedia_sdp_media *m = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_media); PJ_ASSERT_RETURN(m != NULL, NULL); pj_strdup (pool, &m->desc.media, &rhs->desc.media); m->desc.port = rhs->desc.port; m->desc.port_count = rhs->desc.port_count; pj_strdup (pool, &m->desc.transport, &rhs->desc.transport); m->desc.fmt_count = rhs->desc.fmt_count; for (i=0; idesc.fmt_count; ++i) pj_strdup(pool, &m->desc.fmt[i], &rhs->desc.fmt[i]); if (rhs->conn) { m->conn = pjmedia_sdp_conn_clone (pool, rhs->conn); PJ_ASSERT_RETURN(m->conn != NULL, NULL); } else { m->conn = NULL; } m->bandw_count = rhs->bandw_count; for (i=0; i < rhs->bandw_count; ++i) { m->bandw[i] = pjmedia_sdp_bandw_clone (pool, rhs->bandw[i]); PJ_ASSERT_RETURN(m->bandw[i] != NULL, NULL); } m->attr_count = rhs->attr_count; for (i=0; i < rhs->attr_count; ++i) { m->attr[i] = pjmedia_sdp_attr_clone (pool, rhs->attr[i]); PJ_ASSERT_RETURN(m->attr[i] != NULL, NULL); } return m; } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_media_find_attr( const pjmedia_sdp_media *m, const pj_str_t *name, const pj_str_t *fmt) { PJ_ASSERT_RETURN(m && name, NULL); return pjmedia_sdp_attr_find(m->attr_count, m->attr, name, fmt); } PJ_DEF(pjmedia_sdp_attr*) pjmedia_sdp_media_find_attr2( const pjmedia_sdp_media *m, const char *name, const pj_str_t *fmt) { PJ_ASSERT_RETURN(m && name, NULL); return pjmedia_sdp_attr_find2(m->attr_count, m->attr, name, fmt); } PJ_DEF(pj_status_t) pjmedia_sdp_media_add_attr( pjmedia_sdp_media *m, pjmedia_sdp_attr *attr) { return pjmedia_sdp_attr_add(&m->attr_count, m->attr, attr); } PJ_DEF(pj_status_t) pjmedia_sdp_session_add_attr(pjmedia_sdp_session *s, pjmedia_sdp_attr *attr) { return pjmedia_sdp_attr_add(&s->attr_count, s->attr, attr); } PJ_DEF(unsigned) pjmedia_sdp_media_remove_all_attr(pjmedia_sdp_media *m, const char *name) { return pjmedia_sdp_attr_remove_all(&m->attr_count, m->attr, name); } PJ_DEF(pj_status_t) pjmedia_sdp_media_remove_attr(pjmedia_sdp_media *m, pjmedia_sdp_attr *attr) { return pjmedia_sdp_attr_remove(&m->attr_count, m->attr, attr); } static int print_session(const pjmedia_sdp_session *ses, char *buf, pj_ssize_t len) { char *p = buf; char *end = buf+len; unsigned i; int printed; /* Check length for v= and o= lines. */ if (len < 5+ 2+ses->origin.user.slen+18+ ses->origin.net_type.slen+ses->origin.addr.slen + 2) { return -1; } /* SDP version (v= line) */ pj_memcpy(p, "v=0\r\n", 5); p += 5; /* Owner (o=) line. */ *p++ = 'o'; *p++ = '='; pj_memcpy(p, ses->origin.user.ptr, ses->origin.user.slen); p += ses->origin.user.slen; *p++ = ' '; printed = pj_utoa(ses->origin.id, p); p += printed; *p++ = ' '; printed = pj_utoa(ses->origin.version, p); p += printed; *p++ = ' '; pj_memcpy(p, ses->origin.net_type.ptr, ses->origin.net_type.slen); p += ses->origin.net_type.slen; *p++ = ' '; pj_memcpy(p, ses->origin.addr_type.ptr, ses->origin.addr_type.slen); p += ses->origin.addr_type.slen; *p++ = ' '; pj_memcpy(p, ses->origin.addr.ptr, ses->origin.addr.slen); p += ses->origin.addr.slen; *p++ = '\r'; *p++ = '\n'; /* Session name (s=) line. */ if ((end-p) < 8+ses->name.slen) { return -1; } *p++ = 's'; *p++ = '='; pj_memcpy(p, ses->name.ptr, ses->name.slen); p += ses->name.slen; *p++ = '\r'; *p++ = '\n'; /* Connection line (c=) if exist. */ if (ses->conn) { printed = print_connection_info(ses->conn, p, (int)(end-p)); if (printed < 1) { return -1; } p += printed; } /* print optional bandwidth info. */ for (i=0; ibandw_count; ++i) { printed = (int)print_bandw(ses->bandw[i], p, end-p); if (printed < 1) { return -1; } p += printed; } /* Time */ if ((end-p) < 24) { return -1; } *p++ = 't'; *p++ = '='; printed = pj_utoa(ses->time.start, p); p += printed; *p++ = ' '; printed = pj_utoa(ses->time.stop, p); p += printed; *p++ = '\r'; *p++ = '\n'; /* Print all attribute (a=) lines. */ for (i=0; iattr_count; ++i) { printed = (int)print_attr(ses->attr[i], p, end-p); if (printed < 0) { return -1; } p += printed; } /* Print media (m=) lines. */ for (i=0; imedia_count; ++i) { printed = print_media_desc(ses->media[i], p, (int)(end-p)); if (printed < 0) { return -1; } p += printed; } return (int)(p-buf); } /****************************************************************************** * PARSERS */ static void parse_version(pj_scanner *scanner, parse_context *ctx) { ctx->last_error = PJMEDIA_SDP_EINVER; /* check equal sign */ if (*(scanner->curptr+1) != '=') { on_scanner_error(scanner); return; } /* check version is 0 */ if (*(scanner->curptr+2) != '0') { on_scanner_error(scanner); return; } /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); } static void parse_origin(pj_scanner *scanner, pjmedia_sdp_session *ses, parse_context *ctx) { pj_str_t str; ctx->last_error = PJMEDIA_SDP_EINORIGIN; /* check equal sign */ if (*(scanner->curptr+1) != '=') { on_scanner_error(scanner); return; } /* o= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* username. */ pj_scan_get_until_ch(scanner, ' ', &ses->origin.user); pj_scan_get_char(scanner); /* id */ pj_scan_get_until_ch(scanner, ' ', &str); ses->origin.id = pj_strtoul(&str); pj_scan_get_char(scanner); /* version */ pj_scan_get_until_ch(scanner, ' ', &str); ses->origin.version = pj_strtoul(&str); pj_scan_get_char(scanner); /* network-type */ pj_scan_get_until_ch(scanner, ' ', &ses->origin.net_type); pj_scan_get_char(scanner); /* addr-type */ pj_scan_get_until_ch(scanner, ' ', &ses->origin.addr_type); pj_scan_get_char(scanner); /* address */ pj_scan_get_until_chr(scanner, " \t\r\n", &ses->origin.addr); /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); } static void parse_time(pj_scanner *scanner, pjmedia_sdp_session *ses, parse_context *ctx) { pj_str_t str; ctx->last_error = PJMEDIA_SDP_EINTIME; /* check equal sign */ if (*(scanner->curptr+1) != '=') { on_scanner_error(scanner); return; } /* t= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* start time */ pj_scan_get_until_ch(scanner, ' ', &str); ses->time.start = pj_strtoul(&str); pj_scan_get_char(scanner); /* stop time */ pj_scan_get_until_chr(scanner, " \t\r\n", &str); ses->time.stop = pj_strtoul(&str); /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); } static void parse_generic_line(pj_scanner *scanner, pj_str_t *str, parse_context *ctx) { ctx->last_error = PJMEDIA_SDP_EINSDP; /* check equal sign */ if (*(scanner->curptr+1) != '=') { on_scanner_error(scanner); return; } /* x= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* get anything until newline (including whitespaces). */ pj_scan_get_until_chr(scanner, "\r\n", str); /* newline. */ pj_scan_get_newline(scanner); } static void parse_connection_info(pj_scanner *scanner, pjmedia_sdp_conn *conn, parse_context *ctx) { ctx->last_error = PJMEDIA_SDP_EINCONN; /* c= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* network-type */ pj_scan_get_until_ch(scanner, ' ', &conn->net_type); pj_scan_get_char(scanner); /* addr-type */ pj_scan_get_until_ch(scanner, ' ', &conn->addr_type); pj_scan_get_char(scanner); /* address. */ pj_scan_get_until_chr(scanner, "/ \t\r\n", &conn->addr); PJ_TODO(PARSE_SDP_CONN_ADDRESS_SUBFIELDS); /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); } static void parse_bandwidth_info(pj_scanner *scanner, pjmedia_sdp_bandw *bandw, parse_context *ctx) { pj_str_t str; ctx->last_error = PJMEDIA_SDP_EINBANDW; /* b= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* modifier */ pj_scan_get_until_ch(scanner, ':', &bandw->modifier); pj_scan_get_char(scanner); /* value */ pj_scan_get_until_chr(scanner, " \t\r\n", &str); bandw->value = pj_strtoul(&str); /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); } static void parse_media(pj_scanner *scanner, pjmedia_sdp_media *med, parse_context *ctx) { pj_str_t str; ctx->last_error = PJMEDIA_SDP_EINMEDIA; /* check the equal sign */ if (*(scanner->curptr+1) != '=') { on_scanner_error(scanner); return; } /* m= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* type */ pj_scan_get_until_ch(scanner, ' ', &med->desc.media); pj_scan_get_char(scanner); /* port */ pj_scan_get(scanner, &cs_token, &str); med->desc.port = (unsigned short)pj_strtoul(&str); if (*scanner->curptr == '/') { /* port count */ pj_scan_get_char(scanner); pj_scan_get(scanner, &cs_token, &str); med->desc.port_count = pj_strtoul(&str); } else { med->desc.port_count = 0; } if (pj_scan_get_char(scanner) != ' ') { PJ_THROW(SYNTAX_ERROR); } /* transport */ pj_scan_get_until_chr(scanner, " \t\r\n", &med->desc.transport); /* format list */ med->desc.fmt_count = 0; while (*scanner->curptr == ' ') { pj_str_t fmt; pj_scan_get_char(scanner); /* Check again for the end of the line */ if ((*scanner->curptr == '\r') || (*scanner->curptr == '\n')) break; pj_scan_get(scanner, &cs_token, &fmt); if (med->desc.fmt_count < PJMEDIA_MAX_SDP_FMT) med->desc.fmt[med->desc.fmt_count++] = fmt; else PJ_PERROR(2,(THIS_FILE, PJ_ETOOMANY, "Error adding SDP media format %.*s, " "format is ignored", (int)fmt.slen, fmt.ptr)); } /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); } static void on_scanner_error(pj_scanner *scanner) { PJ_UNUSED_ARG(scanner); PJ_THROW(SYNTAX_ERROR); } static pjmedia_sdp_attr *parse_attr( pj_pool_t *pool, pj_scanner *scanner, parse_context *ctx) { pjmedia_sdp_attr *attr; ctx->last_error = PJMEDIA_SDP_EINATTR; attr = PJ_POOL_ALLOC_T(pool, pjmedia_sdp_attr); /* check equal sign */ if (*(scanner->curptr+1) != '=') { on_scanner_error(scanner); return NULL; } /* skip a= */ pj_scan_advance_n(scanner, 2, SKIP_WS); /* get attr name. */ pj_scan_get(scanner, &cs_token, &attr->name); if (*scanner->curptr && *scanner->curptr != '\r' && *scanner->curptr != '\n') { /* skip ':' if present. */ if (*scanner->curptr == ':') pj_scan_get_char(scanner); /* get value */ if (*scanner->curptr != '\r' && *scanner->curptr != '\n') { pj_scan_get_until_chr(scanner, "\r\n", &attr->value); } else { attr->value.ptr = NULL; attr->value.slen = 0; } } else { attr->value.ptr = NULL; attr->value.slen = 0; } /* We've got what we're looking for, skip anything until newline */ pj_scan_skip_line(scanner); return attr; } /* * Apply direction attribute in session to all media. */ static void apply_media_direction(pjmedia_sdp_session *sdp) { pjmedia_sdp_attr *dir_attr = NULL; unsigned i; const pj_str_t inactive = { "inactive", 8 }; const pj_str_t sendonly = { "sendonly", 8 }; const pj_str_t recvonly = { "recvonly", 8 }; const pj_str_t sendrecv = { "sendrecv", 8 }; /* Find direction attribute in session, don't need to find default * direction "sendrecv". */ for (i = 0; i < sdp->attr_count && !dir_attr; ++i) { if (!pj_strcmp(&sdp->attr[i]->name, &sendonly) || !pj_strcmp(&sdp->attr[i]->name, &recvonly) || !pj_strcmp(&sdp->attr[i]->name, &inactive)) { dir_attr = sdp->attr[i]; } } /* Found the direction attribute */ if (dir_attr) { /* Remove the direction attribute in session */ pjmedia_sdp_attr_remove(&sdp->attr_count, sdp->attr, dir_attr); /* Apply the direction attribute to all media, but not overriding it * if media already has direction attribute. */ for (i = 0; i < sdp->media_count; ++i) { pjmedia_sdp_media *m; unsigned j; /* Find direction attribute in this media */ m = sdp->media[i]; for (j = 0; j < m->attr_count; ++j) { if (!pj_strcmp(&m->attr[j]->name, &sendrecv) || !pj_strcmp(&m->attr[j]->name, &sendonly) || !pj_strcmp(&m->attr[j]->name, &recvonly) || !pj_strcmp(&m->attr[j]->name, &inactive)) { break; } } /* Not found, apply direction attribute from session */ if (j == m->attr_count) pjmedia_sdp_media_add_attr(m, dir_attr); } } } /* * Parse SDP message. */ PJ_DEF(pj_status_t) pjmedia_sdp_parse( pj_pool_t *pool, char *buf, pj_size_t len, pjmedia_sdp_session **p_sdp) { pj_scanner scanner; pjmedia_sdp_session *session; pjmedia_sdp_media *media = NULL; pjmedia_sdp_attr *attr; pjmedia_sdp_conn *conn; pjmedia_sdp_bandw *bandw; pj_str_t dummy; int cur_name = 254; parse_context ctx; PJ_USE_EXCEPTION; ctx.last_error = PJ_SUCCESS; init_sdp_parser(); pj_scan_init(&scanner, buf, len, 0, &on_scanner_error); session = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_session); PJ_ASSERT_RETURN(session != NULL, PJ_ENOMEM); /* Ignore leading newlines */ while (*scanner.curptr=='\r' || *scanner.curptr=='\n') pj_scan_get_char(&scanner); PJ_TRY { while (!pj_scan_is_eof(&scanner)) { cur_name = *scanner.curptr; switch (cur_name) { case 'a': attr = parse_attr(pool, &scanner, &ctx); if (attr) { if (media) { if (media->attr_count < PJMEDIA_MAX_SDP_ATTR) pjmedia_sdp_media_add_attr(media, attr); else PJ_PERROR(2, (THIS_FILE, PJ_ETOOMANY, "Error adding media attribute, " "attribute is ignored")); } else { if (session->attr_count < PJMEDIA_MAX_SDP_ATTR) pjmedia_sdp_session_add_attr(session, attr); else PJ_PERROR(2, (THIS_FILE, PJ_ETOOMANY, "Error adding session attribute" ", attribute is ignored")); } } break; case 'o': parse_origin(&scanner, session, &ctx); break; case 's': parse_generic_line(&scanner, &session->name, &ctx); break; case 'c': conn = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_conn); parse_connection_info(&scanner, conn, &ctx); if (media) { media->conn = conn; } else { session->conn = conn; } break; case 't': parse_time(&scanner, session, &ctx); break; case 'm': media = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_media); parse_media(&scanner, media, &ctx); if (session->media_count < PJMEDIA_MAX_SDP_MEDIA) session->media[ session->media_count++ ] = media; else PJ_PERROR(2,(THIS_FILE, PJ_ETOOMANY, "Error adding media, media is ignored")); break; case 'v': parse_version(&scanner, &ctx); break; case 13: case 10: pj_scan_get_char(&scanner); /* Allow empty newlines at the end of the message */ while (!pj_scan_is_eof(&scanner)) { if (*scanner.curptr != 13 && *scanner.curptr != 10) { ctx.last_error = PJMEDIA_SDP_EINSDP; on_scanner_error(&scanner); } pj_scan_get_char(&scanner); } break; case 'b': bandw = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_bandw); parse_bandwidth_info(&scanner, bandw, &ctx); if (media) { if (media->bandw_count < PJMEDIA_MAX_SDP_BANDW) media->bandw[media->bandw_count++] = bandw; else PJ_PERROR(2, (THIS_FILE, PJ_ETOOMANY, "Error adding media bandwidth " "info, info is ignored")); } else { if (session->bandw_count < PJMEDIA_MAX_SDP_BANDW) session->bandw[session->bandw_count++] = bandw; else PJ_PERROR(2, (THIS_FILE, PJ_ETOOMANY, "Error adding session bandwidth " "info, info is ignored")); } break; default: if (cur_name >= 'a' && cur_name <= 'z') parse_generic_line(&scanner, &dummy, &ctx); else { ctx.last_error = PJMEDIA_SDP_EINSDP; on_scanner_error(&scanner); } break; } } ctx.last_error = PJ_SUCCESS; } PJ_CATCH_ANY { PJ_PERROR(4, (THIS_FILE, ctx.last_error, "Error parsing SDP in line %d col %d", scanner.line, pj_scan_get_col(&scanner))); session = NULL; pj_assert(ctx.last_error != PJ_SUCCESS); } PJ_END; pj_scan_fini(&scanner); if (session) apply_media_direction(session); *p_sdp = session; return ctx.last_error; } /* * Print SDP description. */ PJ_DEF(int) pjmedia_sdp_print( const pjmedia_sdp_session *desc, char *buf, pj_size_t size) { return print_session(desc, buf, size); } /* * Clone session */ PJ_DEF(pjmedia_sdp_session*) pjmedia_sdp_session_clone( pj_pool_t *pool, const pjmedia_sdp_session *rhs) { pjmedia_sdp_session *sess; unsigned i; PJ_ASSERT_RETURN(pool && rhs, NULL); sess = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_session); PJ_ASSERT_RETURN(sess != NULL, NULL); /* Clone origin line. */ pj_strdup(pool, &sess->origin.user, &rhs->origin.user); sess->origin.id = rhs->origin.id; sess->origin.version = rhs->origin.version; pj_strdup(pool, &sess->origin.net_type, &rhs->origin.net_type); pj_strdup(pool, &sess->origin.addr_type, &rhs->origin.addr_type); pj_strdup(pool, &sess->origin.addr, &rhs->origin.addr); /* Clone subject line. */ pj_strdup(pool, &sess->name, &rhs->name); /* Clone connection line */ if (rhs->conn) { sess->conn = pjmedia_sdp_conn_clone(pool, rhs->conn); PJ_ASSERT_RETURN(sess->conn != NULL, NULL); } /* Duplicate bandwidth info */ sess->bandw_count = rhs->bandw_count; for (i=0; ibandw_count; ++i) { sess->bandw[i] = pjmedia_sdp_bandw_clone(pool, rhs->bandw[i]); } /* Clone time line. */ sess->time.start = rhs->time.start; sess->time.stop = rhs->time.stop; /* Duplicate session attributes. */ sess->attr_count = rhs->attr_count; for (i=0; iattr_count; ++i) { sess->attr[i] = pjmedia_sdp_attr_clone(pool, rhs->attr[i]); } /* Duplicate media descriptors. */ sess->media_count = rhs->media_count; for (i=0; imedia_count; ++i) { sess->media[i] = pjmedia_sdp_media_clone(pool, rhs->media[i]); } return sess; } #define CHECK(exp,ret) do { \ /*pj_assert(exp);*/ \ if (!(exp)) \ return ret; \ } while (0) /* Validate SDP connetion info. */ static pj_status_t validate_sdp_conn(const pjmedia_sdp_conn *c) { CHECK( c, PJ_EINVAL); CHECK( pj_strcmp2(&c->net_type, "IN")==0, PJMEDIA_SDP_EINCONN); CHECK( pj_strcmp2(&c->addr_type, "IP4")==0 || pj_strcmp2(&c->addr_type, "IP6")==0, PJMEDIA_SDP_EINCONN); CHECK( c->addr.slen != 0, PJMEDIA_SDP_EINCONN); return PJ_SUCCESS; } /* Validate SDP session descriptor. */ PJ_DEF(pj_status_t) pjmedia_sdp_validate(const pjmedia_sdp_session *sdp) { return pjmedia_sdp_validate2(sdp, PJ_TRUE); } /* Validate SDP session descriptor. */ PJ_DEF(pj_status_t) pjmedia_sdp_validate2(const pjmedia_sdp_session *sdp, pj_bool_t strict) { unsigned i; const pj_str_t STR_RTPMAP = { "rtpmap", 6 }; CHECK( sdp != NULL, PJ_EINVAL); /* Validate origin line. */ CHECK( sdp->origin.user.slen != 0, PJMEDIA_SDP_EINORIGIN); CHECK( pj_strcmp2(&sdp->origin.net_type, "IN")==0, PJMEDIA_SDP_EINORIGIN); CHECK( pj_strcmp2(&sdp->origin.addr_type, "IP4")==0 || pj_strcmp2(&sdp->origin.addr_type, "IP6")==0, PJMEDIA_SDP_EINORIGIN); CHECK( sdp->origin.addr.slen != 0, PJMEDIA_SDP_EINORIGIN); /* Validate subject line. */ CHECK( sdp->name.slen != 0, PJMEDIA_SDP_EINNAME); /* Ignore start and stop time. */ /* If session level connection info is present, validate it. */ if (sdp->conn) { pj_status_t status = validate_sdp_conn(sdp->conn); if (status != PJ_SUCCESS) return status; } /* Validate each media. */ for (i=0; imedia_count; ++i) { const pjmedia_sdp_media *m = sdp->media[i]; unsigned j; /* Validate the m= line. */ CHECK( m->desc.media.slen != 0, PJMEDIA_SDP_EINMEDIA); CHECK( m->desc.transport.slen != 0, PJMEDIA_SDP_EINMEDIA); CHECK( m->desc.fmt_count != 0 || m->desc.port==0, PJMEDIA_SDP_ENOFMT); /* If media level connection info is present, validate it. */ if (m->conn) { pj_status_t status = validate_sdp_conn(m->conn); if (status != PJ_SUCCESS) return status; } /* If media doesn't have connection info, then connection info * must be present in the session. */ if (m->conn == NULL) { if (sdp->conn == NULL) if (strict || m->desc.port != 0) return PJMEDIA_SDP_EMISSINGCONN; } /* Verify payload type. */ for (j=0; jdesc.fmt_count; ++j) { /* Arrgh noo!! Payload type can be non-numeric!! * RTC based programs sends "null" for instant messaging! */ if (pj_isdigit(*m->desc.fmt[j].ptr)) { unsigned long pt; pj_status_t status = pj_strtoul3(&m->desc.fmt[j], &pt, 10); /* Payload type is between 0 and 127. */ CHECK( status == PJ_SUCCESS && pt <= 127, PJMEDIA_SDP_EINPT); /* If port is not zero, then for each dynamic payload type, an * rtpmap attribute must be specified. */ if (m->desc.port != 0 && pt >= 96) { const pjmedia_sdp_attr *a; a = pjmedia_sdp_media_find_attr(m, &STR_RTPMAP, &m->desc.fmt[j]); CHECK( a != NULL, PJMEDIA_SDP_EMISSINGRTPMAP); } } } } /* Looks good. */ return PJ_SUCCESS; } PJ_DEF(pj_status_t) pjmedia_sdp_transport_cmp( const pj_str_t *t1, const pj_str_t *t2) { pj_uint32_t t1_proto, t2_proto; /* Exactly equal? */ if (pj_stricmp(t1, t2) == 0) return PJ_SUCCESS; /* Check if boths are RTP/AVP based */ t1_proto = pjmedia_sdp_transport_get_proto(t1); t2_proto = pjmedia_sdp_transport_get_proto(t2); if (PJMEDIA_TP_PROTO_HAS_FLAG(t1_proto, PJMEDIA_TP_PROTO_RTP_AVP) && PJMEDIA_TP_PROTO_HAS_FLAG(t2_proto, PJMEDIA_TP_PROTO_RTP_AVP)) { return PJ_SUCCESS; } /* Compatible? */ //{ // static const pj_str_t ID_RTP_AVP = { "RTP/AVP", 7 }; // static const pj_str_t ID_RTP_SAVP = { "RTP/SAVP", 8 }; // if ((!pj_stricmp(t1, &ID_RTP_AVP) || !pj_stricmp(t1, &ID_RTP_SAVP)) && // (!pj_stricmp(t2, &ID_RTP_AVP) || !pj_stricmp(t2, &ID_RTP_SAVP))) // return PJ_SUCCESS; //} return PJMEDIA_SDP_ETPORTNOTEQUAL; } /* * Get media transport info, e.g: protocol and profile. */ PJ_DEF(pj_uint32_t) pjmedia_sdp_transport_get_proto(const pj_str_t *tp) { pj_str_t token, rest = {0}; pj_ssize_t idx; PJ_ASSERT_RETURN(tp, PJMEDIA_TP_PROTO_NONE); idx = pj_strtok2(tp, "/", &token, 0); if (idx != tp->slen) pj_strset(&rest, tp->ptr + token.slen + 1, tp->slen - token.slen - 1); if (pj_stricmp2(&token, "RTP") == 0) { /* Starts with "RTP" */ /* RTP/AVP */ if (pj_stricmp2(&rest, "AVP") == 0) return PJMEDIA_TP_PROTO_RTP_AVP; /* RTP/SAVP */ if (pj_stricmp2(&rest, "SAVP") == 0) return PJMEDIA_TP_PROTO_RTP_SAVP; /* RTP/AVPF */ if (pj_stricmp2(&rest, "AVPF") == 0) return PJMEDIA_TP_PROTO_RTP_AVPF; /* RTP/SAVPF */ if (pj_stricmp2(&rest, "SAVPF") == 0) return PJMEDIA_TP_PROTO_RTP_SAVPF; } else if (pj_stricmp2(&token, "UDP") == 0) { /* Starts with "UDP" */ /* Plain UDP */ if (rest.slen == 0) return PJMEDIA_TP_PROTO_UDP; /* DTLS-SRTP */ if (pj_stricmp2(&rest, "TLS/RTP/SAVP") == 0) return PJMEDIA_TP_PROTO_DTLS_SRTP; /* DTLS-SRTP with RTCP-FB */ if (pj_stricmp2(&rest, "TLS/RTP/SAVPF") == 0) return PJMEDIA_TP_PROTO_DTLS_SRTPF; } /* Unknown transport */ return PJMEDIA_TP_PROTO_UNKNOWN; } PJ_DEF(pj_status_t) pjmedia_sdp_media_deactivate(pj_pool_t *pool, pjmedia_sdp_media *m) { PJ_ASSERT_RETURN(m, PJ_EINVAL); PJ_UNUSED_ARG(pool); /* Set port to zero */ m->desc.port = 0; /* And remove attributes */ m->attr_count = 0; return PJ_SUCCESS; } PJ_DEF(pjmedia_sdp_media*) pjmedia_sdp_media_clone_deactivate( pj_pool_t *pool, const pjmedia_sdp_media *rhs) { unsigned int i; pjmedia_sdp_media *m; PJ_ASSERT_RETURN(pool && rhs, NULL); m = PJ_POOL_ZALLOC_T(pool, pjmedia_sdp_media); pj_memcpy(m, rhs, sizeof(*m)); /* Clone the media line only */ pj_strdup (pool, &m->desc.media, &rhs->desc.media); pj_strdup (pool, &m->desc.transport, &rhs->desc.transport); for (i=0; idesc.fmt_count; ++i) pj_strdup(pool, &m->desc.fmt[i], &rhs->desc.fmt[i]); if (rhs->conn) { m->conn = pjmedia_sdp_conn_clone (pool, rhs->conn); PJ_ASSERT_RETURN(m->conn != NULL, NULL); } m->bandw_count = rhs->bandw_count; for (i=0; i < rhs->bandw_count; ++i) { m->bandw[i] = pjmedia_sdp_bandw_clone (pool, rhs->bandw[i]); PJ_ASSERT_RETURN(m->bandw[i] != NULL, NULL); } /* And deactivate it */ pjmedia_sdp_media_deactivate(pool, m); return m; }