1 /*****************************************************************************
2 * sdp.c : SDP creation helpers
3 *****************************************************************************
4 * Copyright © 2007 Rémi Denis-Courmont
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published by
9 * the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
20 *****************************************************************************/
32 #include <vlc_network.h>
33 #include <vlc_charset.h>
35 #include "stream_output.h"
37 #define MAXSDPADDRESS 47
40 char *AddressToSDP (const struct sockaddr *addr, socklen_t addrlen, char *buf)
42 if (addrlen < offsetof (struct sockaddr, sa_family)
43 + sizeof (addr->sa_family))
46 strcpy (buf, "IN IP* ");
48 if (vlc_getnameinfo (addr, addrlen, buf + 7, MAXSDPADDRESS - 7, NULL,
52 switch (addr->sa_family)
56 if (net_SockAddrIsMulticast (addr, addrlen))
57 strcat (buf, "/255"); // obsolete in RFC4566, dummy value
65 char *ptr = strchr (buf, '%');
67 *ptr = '\0'; // remove scope ID
81 static vlc_bool_t IsSDPString (const char *str)
83 if (strchr (str, '\r') != NULL)
85 if (strchr (str, '\n') != NULL)
94 char *sdp_Start (const char *name, const char *description, const char *url,
95 const char *email, const char *phone,
96 const struct sockaddr *src, size_t srclen,
97 const struct sockaddr *addr, size_t addrlen)
99 uint64_t now = NTPtime64 ();
101 char connection[MAXSDPADDRESS], hostname[256],
102 sfilter[MAXSDPADDRESS + sizeof ("\r\na=source-filter: incl * ")];
103 const char *preurl = "\r\nu=", *premail = "\r\ne=", *prephone = "\r\np=";
105 gethostname (hostname, sizeof (hostname));
109 if (description == NULL)
114 premail = email = "";
116 prephone = phone = "";
118 if (!IsSDPString (name) || !IsSDPString (description)
119 || !IsSDPString (url) || !IsSDPString (email) || !IsSDPString (phone)
120 || (AddressToSDP (addr, addrlen, connection) == NULL))
123 strcpy (sfilter, "");
126 char machine[MAXSDPADDRESS];
128 if (AddressToSDP (src, srclen, machine) != NULL)
129 sprintf (sfilter, "\r\na=source-filter: incl IN IP%c * %s",
130 machine[5], machine + 7);
133 if (asprintf (&sdp, "v=0"
134 "\r\no=- "I64Fu" "I64Fu" IN IP%c %s"
137 "%s%s" // optional URL
138 "%s%s" // optional email
139 "%s%s" // optional phone number
141 // bandwidth not specified
142 "\r\nt=0 0" // one dummy time span
144 // no time zone adjustment (silly idea anyway)
145 // no encryption key (deprecated)
146 "\r\na=tool:"PACKAGE_STRING
148 "\r\na=type:broadcast"
149 "\r\na=charset:UTF-8"
150 "%s" // optional source filter
152 /* o= */ now, now, connection[5], hostname,
154 /* i= */ description,
155 /* u= */ preurl, url,
156 /* e= */ premail, email,
157 /* p= */ prephone, phone,
159 /* source-filter */ sfilter) == -1)
166 vsdp_AddAttribute (char **sdp, const char *name, const char *fmt, va_list ap)
168 size_t oldlen = strlen (*sdp);
169 size_t addlen = sizeof ("a=\r\n") + strlen (name);
176 addlen += 1 + vsnprintf (NULL, 0, fmt, aq);
180 char *ret = realloc (*sdp, oldlen + addlen);
184 oldlen += sprintf (ret + oldlen, "a=%s", name);
188 oldlen += vsprintf (ret + oldlen, fmt, ap);
191 strcpy (ret + oldlen, "\r\n");
196 char *sdp_AddAttribute (char **sdp, const char *name, const char *fmt, ...)
202 ret = vsdp_AddAttribute (sdp, name, fmt, ap);
209 char *sdp_AddMedia (char **sdp,
210 const char *type, const char *protocol, int dport,
211 unsigned pt, vlc_bool_t bw_indep, unsigned bw,
212 const char *ptname, unsigned clock, unsigned chans,
216 size_t inlen = strlen (*sdp), outlen = inlen;
218 /* Some default values */
221 if (protocol == NULL)
222 protocol = "RTP/AVP";
225 outlen += snprintf (NULL, 0,
229 type, dport, protocol, pt, bw);
231 newsdp = realloc (*sdp, outlen + 1);
236 ptr = newsdp + inlen;
238 ptr += sprintf (ptr, "m=%s %u %s %u\r\n",
239 type, dport, protocol, pt);
241 ptr += sprintf (ptr, "b=%s:%u\r\n", bw_indep ? "TIAS" : "AS", bw);
242 ptr += sprintf (ptr, "b=RR:0\r\n");
244 /* RTP payload type map */
247 if ((strcmp (type, "audio") == 0) && (chans != 1))
248 sdp_AddAttribute (sdp, "rtpmap", "%u %s/%u/%u", pt, ptname, clock,
251 sdp_AddAttribute (sdp, "rtpmap", "%u %s/%u", pt, ptname, clock);
253 /* Format parameters */
255 sdp_AddAttribute (sdp, "fmtp", "%u %s", pt, fmtp);
261 char *vlc_sdp_Start (vlc_object_t *obj, const char *cfgpref,
262 const struct sockaddr *src, size_t srclen,
263 const struct sockaddr *addr, size_t addrlen)
265 size_t cfglen = strlen (cfgpref);
269 char varname[cfglen + sizeof ("description")], *subvar = varname + cfglen;
270 strcpy (varname, cfgpref);
272 session_descriptor_t *p_session = calloc (1, sizeof (*p_session));
273 if (p_session == NULL)
276 strcpy (subvar, "name");
277 char *name = var_GetNonEmptyString (obj, varname);
278 strcpy (subvar, "description");
279 char *description = var_GetNonEmptyString (obj, varname);
280 strcpy (subvar, "url");
281 char *url = var_GetNonEmptyString (obj, varname);
282 strcpy (subvar, "email");
283 char *email = var_GetNonEmptyString (obj, varname);
284 strcpy (subvar, "phone");
285 char *phone = var_GetNonEmptyString (obj, varname);
287 char *sdp = sdp_Start (name, description, url, email, phone,
288 src, srclen, addr, addrlen);
298 /* Totally non-standard */
299 strcpy (subvar, "group");
300 char *group = var_GetNonEmptyString (obj, varname);
303 sdp_AddAttribute (&sdp, "x-plgroup", "%s", group);