2 * Session Announcement Protocol (RFC 2974) muxer
3 * Copyright (c) 2010 Martin Storsjo
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg 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 GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "libavutil/random_seed.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/intreadwrite.h"
28 #include "os_support.h"
29 #include "rtpenc_chain.h"
38 static int sap_write_close(AVFormatContext *s)
40 struct SAPState *sap = s->priv_data;
43 for (i = 0; i < s->nb_streams; i++) {
44 AVFormatContext *rtpctx = s->streams[i]->priv_data;
47 av_write_trailer(rtpctx);
48 url_fclose(rtpctx->pb);
49 av_metadata_free(&rtpctx->streams[0]->metadata);
50 av_metadata_free(&rtpctx->metadata);
51 av_free(rtpctx->streams[0]->info);
52 av_free(rtpctx->streams[0]);
54 s->streams[i]->priv_data = NULL;
57 if (sap->last_time && sap->ann && sap->ann_fd) {
58 sap->ann[0] |= 4; /* Session deletion*/
59 url_write(sap->ann_fd, sap->ann, sap->ann_size);
64 url_close(sap->ann_fd);
69 static int sap_write_header(AVFormatContext *s)
71 struct SAPState *sap = s->priv_data;
72 char host[1024], path[1024], url[1024], announce_addr[50] = "";
74 int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;
75 AVFormatContext **contexts = NULL;
77 struct sockaddr_storage localaddr;
78 socklen_t addrlen = sizeof(localaddr);
81 if (!ff_network_init())
84 /* extract hostname and port */
85 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port,
86 path, sizeof(path), s->filename);
90 /* search for options */
91 option_list = strrchr(path, '?');
94 if (find_info_tag(buf, sizeof(buf), "announce_port", option_list)) {
95 port = strtol(buf, NULL, 10);
97 if (find_info_tag(buf, sizeof(buf), "same_port", option_list)) {
98 same_port = strtol(buf, NULL, 10);
100 if (find_info_tag(buf, sizeof(buf), "ttl", option_list)) {
101 ttl = strtol(buf, NULL, 10);
103 if (find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {
104 av_strlcpy(announce_addr, buf, sizeof(announce_addr));
108 if (!announce_addr[0]) {
109 struct addrinfo hints, *ai = NULL;
110 memset(&hints, 0, sizeof(hints));
111 hints.ai_family = AF_UNSPEC;
112 if (getaddrinfo(host, NULL, &hints, &ai)) {
113 av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host);
117 if (ai->ai_family == AF_INET) {
118 /* Also known as sap.mcast.net */
119 av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr));
120 #if HAVE_STRUCT_SOCKADDR_IN6
121 } else if (ai->ai_family == AF_INET6) {
122 /* With IPv6, you can use the same destination in many different
123 * multicast subnets, to choose how far you want it routed.
124 * This one is intended to be routed globally. */
125 av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));
129 av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "
130 "address family\n", host);
137 contexts = av_mallocz(sizeof(AVFormatContext*) * s->nb_streams);
139 ret = AVERROR(ENOMEM);
143 s->start_time_realtime = av_gettime();
144 for (i = 0; i < s->nb_streams; i++) {
147 ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,
151 ret = url_open(&fd, url, URL_WRONLY);
156 s->streams[i]->priv_data = contexts[i] =
157 ff_rtp_chain_mux_open(s, s->streams[i], fd, 0);
158 av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
161 ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
162 "?ttl=%d&connect=1", ttl);
163 ret = url_open(&sap->ann_fd, url, URL_WRONLY);
169 udp_fd = url_get_file_handle(sap->ann_fd);
170 if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {
174 if (localaddr.ss_family != AF_INET
175 #if HAVE_STRUCT_SOCKADDR_IN6
176 && localaddr.ss_family != AF_INET6
179 av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");
183 sap->ann_size = 8192;
184 sap->ann = av_mallocz(sap->ann_size);
189 sap->ann[pos] = (1 << 5);
190 #if HAVE_STRUCT_SOCKADDR_IN6
191 if (localaddr.ss_family == AF_INET6)
192 sap->ann[pos] |= 0x10;
195 sap->ann[pos++] = 0; /* Authentication length */
196 AV_WB16(&sap->ann[pos], av_get_random_seed());
198 if (localaddr.ss_family == AF_INET) {
199 memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,
200 sizeof(struct in_addr));
201 pos += sizeof(struct in_addr);
202 #if HAVE_STRUCT_SOCKADDR_IN6
204 memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,
205 sizeof(struct in6_addr));
206 pos += sizeof(struct in6_addr);
210 av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);
211 pos += strlen(&sap->ann[pos]) + 1;
213 if (avf_sdp_create(contexts, s->nb_streams, &sap->ann[pos],
214 sap->ann_size - pos)) {
215 ret = AVERROR_INVALIDDATA;
219 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
220 pos += strlen(&sap->ann[pos]);
223 if (sap->ann_size > url_get_max_packet_size(sap->ann_fd)) {
224 av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "
237 static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)
239 AVFormatContext *rtpctx;
240 struct SAPState *sap = s->priv_data;
241 int64_t now = av_gettime();
243 if (!sap->last_time || now - sap->last_time > 5000000) {
244 int ret = url_write(sap->ann_fd, sap->ann, sap->ann_size);
245 /* Don't abort even if we get "Destination unreachable" */
246 if (ret < 0 && ret != FF_NETERROR(ECONNREFUSED))
248 sap->last_time = now;
250 rtpctx = s->streams[pkt->stream_index]->priv_data;
251 return ff_write_chained(rtpctx, 0, pkt, s);
254 AVOutputFormat ff_sap_muxer = {
256 NULL_IF_CONFIG_SMALL("SAP output format"),
259 sizeof(struct SAPState),
265 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,