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]);
53 s->streams[i]->priv_data = NULL;
56 if (sap->last_time && sap->ann && sap->ann_fd) {
57 sap->ann[0] |= 4; /* Session deletion*/
58 url_write(sap->ann_fd, sap->ann, sap->ann_size);
63 url_close(sap->ann_fd);
68 static int sap_write_header(AVFormatContext *s)
70 struct SAPState *sap = s->priv_data;
71 char host[1024], path[1024], url[1024], announce_addr[50] = "";
73 int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;
74 AVFormatContext **contexts = NULL;
76 struct sockaddr_storage localaddr;
77 socklen_t addrlen = sizeof(localaddr);
80 if (!ff_network_init())
83 /* extract hostname and port */
84 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port,
85 path, sizeof(path), s->filename);
89 /* search for options */
90 option_list = strrchr(path, '?');
93 if (find_info_tag(buf, sizeof(buf), "announce_port", option_list)) {
94 port = strtol(buf, NULL, 10);
96 if (find_info_tag(buf, sizeof(buf), "same_port", option_list)) {
97 same_port = strtol(buf, NULL, 10);
99 if (find_info_tag(buf, sizeof(buf), "ttl", option_list)) {
100 ttl = strtol(buf, NULL, 10);
102 if (find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {
103 av_strlcpy(announce_addr, buf, sizeof(announce_addr));
107 if (!announce_addr[0]) {
108 struct addrinfo hints, *ai = NULL;
109 memset(&hints, 0, sizeof(hints));
110 hints.ai_family = AF_UNSPEC;
111 if (getaddrinfo(host, NULL, &hints, &ai)) {
112 av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host);
116 if (ai->ai_family == AF_INET) {
117 /* Also known as sap.mcast.net */
118 av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr));
119 #if HAVE_STRUCT_SOCKADDR_IN6
120 } else if (ai->ai_family == AF_INET6) {
121 /* With IPv6, you can use the same destination in many different
122 * multicast subnets, to choose how far you want it routed.
123 * This one is intended to be routed globally. */
124 av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));
128 av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "
129 "address family\n", host);
136 contexts = av_mallocz(sizeof(AVFormatContext*) * s->nb_streams);
138 ret = AVERROR(ENOMEM);
142 s->start_time_realtime = av_gettime();
143 for (i = 0; i < s->nb_streams; i++) {
146 ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,
150 ret = url_open(&fd, url, URL_WRONLY);
155 s->streams[i]->priv_data = contexts[i] =
156 ff_rtp_chain_mux_open(s, s->streams[i], fd, 0);
157 av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
160 ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
161 "?ttl=%d&connect=1", ttl);
162 ret = url_open(&sap->ann_fd, url, URL_WRONLY);
168 udp_fd = url_get_file_handle(sap->ann_fd);
169 if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {
173 if (localaddr.ss_family != AF_INET
174 #if HAVE_STRUCT_SOCKADDR_IN6
175 && localaddr.ss_family != AF_INET6
178 av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");
182 sap->ann_size = 8192;
183 sap->ann = av_mallocz(sap->ann_size);
188 sap->ann[pos] = (1 << 5);
189 #if HAVE_STRUCT_SOCKADDR_IN6
190 if (localaddr.ss_family == AF_INET6)
191 sap->ann[pos] |= 0x10;
194 sap->ann[pos++] = 0; /* Authentication length */
195 AV_WB16(&sap->ann[pos], av_get_random_seed());
197 if (localaddr.ss_family == AF_INET) {
198 memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,
199 sizeof(struct in_addr));
200 pos += sizeof(struct in_addr);
201 #if HAVE_STRUCT_SOCKADDR_IN6
203 memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,
204 sizeof(struct in6_addr));
205 pos += sizeof(struct in6_addr);
209 av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);
210 pos += strlen(&sap->ann[pos]) + 1;
212 if (avf_sdp_create(contexts, s->nb_streams, &sap->ann[pos],
213 sap->ann_size - pos)) {
214 ret = AVERROR_INVALIDDATA;
218 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
219 pos += strlen(&sap->ann[pos]);
222 if (sap->ann_size > url_get_max_packet_size(sap->ann_fd)) {
223 av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "
236 static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)
238 AVFormatContext *rtpctx;
239 struct SAPState *sap = s->priv_data;
240 int64_t now = av_gettime();
242 if (!sap->last_time || now - sap->last_time > 5000000) {
243 int ret = url_write(sap->ann_fd, sap->ann, sap->ann_size);
244 /* Don't abort even if we get "Destination unreachable" */
245 if (ret < 0 && ret != FF_NETERROR(ECONNREFUSED))
247 sap->last_time = now;
249 rtpctx = s->streams[pkt->stream_index]->priv_data;
250 return ff_write_chained(rtpctx, 0, pkt, s);
253 AVOutputFormat sap_muxer = {
255 NULL_IF_CONFIG_SMALL("SAP output format"),
258 sizeof(struct SAPState),
264 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,