Add a SAP (Session Announcement Protocol, RFC 2974) muxer
[libav.git] / libavformat / sapenc.c
CommitLineData
011071e7
MS
1/*
2 * Session Announcement Protocol (RFC 2974) muxer
3 * Copyright (c) 2010 Martin Storsjo
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include "avformat.h"
23#include "libavutil/random_seed.h"
24#include "libavutil/avstring.h"
25#include "libavutil/intreadwrite.h"
26#include "internal.h"
27#include "network.h"
28#include "rtpenc_chain.h"
29
30struct SAPState {
31 uint8_t *ann;
32 int ann_size;
33 URLContext *ann_fd;
34 int64_t last_time;
35};
36
37static int sap_write_close(AVFormatContext *s)
38{
39 struct SAPState *sap = s->priv_data;
40 int i;
41
42 for (i = 0; i < s->nb_streams; i++) {
43 AVFormatContext *rtpctx = s->streams[i]->priv_data;
44 if (!rtpctx)
45 continue;
46 av_write_trailer(rtpctx);
47 url_fclose(rtpctx->pb);
48 av_metadata_free(&rtpctx->streams[0]->metadata);
49 av_metadata_free(&rtpctx->metadata);
50 av_free(rtpctx->streams[0]);
51 av_free(rtpctx);
52 s->streams[i]->priv_data = NULL;
53 }
54
55 if (sap->last_time && sap->ann && sap->ann_fd) {
56 sap->ann[0] |= 4; /* Session deletion*/
57 url_write(sap->ann_fd, sap->ann, sap->ann_size);
58 }
59
60 av_freep(&sap->ann);
61 if (sap->ann_fd)
62 url_close(sap->ann_fd);
63 ff_network_close();
64 return 0;
65}
66
67static int sap_write_header(AVFormatContext *s)
68{
69 struct SAPState *sap = s->priv_data;
70 char host[1024], path[1024], url[1024], announce_addr[50] = "";
71 char *option_list;
72 int port, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;
73 AVFormatContext **contexts = NULL;
74 int ret = 0;
75 struct sockaddr_storage localaddr;
76 socklen_t addrlen = sizeof(localaddr);
77 int udp_fd;
78
79 if (!ff_network_init())
80 return AVERROR(EIO);
81
82 /* extract hostname and port */
83 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
84 path, sizeof(path), s->filename);
85 if (port < 0)
86 port = 9875;
87
88 /* search for options */
89 option_list = strrchr(path, '?');
90 if (option_list) {
91 char buf[50];
92 if (find_info_tag(buf, sizeof(buf), "base_port", option_list)) {
93 base_port = strtol(buf, NULL, 10);
94 }
95 if (find_info_tag(buf, sizeof(buf), "same_port", option_list)) {
96 same_port = strtol(buf, NULL, 10);
97 }
98 if (find_info_tag(buf, sizeof(buf), "ttl", option_list)) {
99 ttl = strtol(buf, NULL, 10);
100 }
101 if (find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {
102 av_strlcpy(announce_addr, buf, sizeof(announce_addr));
103 }
104 }
105
106 if (!announce_addr[0]) {
107 struct addrinfo hints, *ai = NULL;
108 memset(&hints, 0, sizeof(hints));
109 hints.ai_family = PF_UNSPEC;
110 if (getaddrinfo(host, NULL, &hints, &ai)) {
111 av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host);
112 ret = AVERROR(EIO);
113 goto fail;
114 }
115 if (ai->ai_family == AF_INET) {
116 /* Also known as sap.mcast.net */
117 av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr));
118 } else if (ai->ai_family == AF_INET6) {
119 /* With IPv6, you can use the same destination in many different
120 * multicast subnets, to choose how far you want it routed.
121 * This one is intended to be routed globally. */
122 av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));
123 } else {
124 freeaddrinfo(ai);
125 av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "
126 "address family\n", host);
127 ret = AVERROR(EIO);
128 goto fail;
129 }
130 freeaddrinfo(ai);
131 }
132
133 contexts = av_mallocz(sizeof(AVFormatContext*) * s->nb_streams);
134 if (!contexts) {
135 ret = AVERROR(ENOMEM);
136 goto fail;
137 }
138
139 s->start_time_realtime = av_gettime();
140 for (i = 0; i < s->nb_streams; i++) {
141 URLContext *fd;
142
143 ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,
144 "?ttl=%d", ttl);
145 if (!same_port)
146 base_port += 2;
147 ret = url_open(&fd, url, URL_WRONLY);
148 if (ret) {
149 ret = AVERROR(EIO);
150 goto fail;
151 }
152 s->streams[i]->priv_data = contexts[i] =
153 ff_rtp_chain_mux_open(s, s->streams[i], fd, 0);
154 av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
155 }
156
157 ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
158 "?ttl=%d&connect=1", ttl);
159 ret = url_open(&sap->ann_fd, url, URL_WRONLY);
160 if (ret) {
161 ret = AVERROR(EIO);
162 goto fail;
163 }
164
165 udp_fd = url_get_file_handle(sap->ann_fd);
166 if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {
167 ret = AVERROR(EIO);
168 goto fail;
169 }
170 if (localaddr.ss_family != AF_INET && localaddr.ss_family != AF_INET6) {
171 av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");
172 ret = AVERROR(EIO);
173 goto fail;
174 }
175 sap->ann_size = 8192;
176 sap->ann = av_mallocz(sap->ann_size);
177 if (!sap->ann) {
178 ret = AVERROR(EIO);
179 goto fail;
180 }
181 sap->ann[pos++] = (1 << 5) | ((localaddr.ss_family == AF_INET6) << 4);
182 sap->ann[pos++] = 0; /* Authentication length */
183 AV_WB16(&sap->ann[pos], av_get_random_seed());
184 pos += 2;
185 if (localaddr.ss_family == AF_INET) {
186 memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,
187 sizeof(struct in_addr));
188 pos += sizeof(struct in_addr);
189 } else {
190 memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,
191 sizeof(struct in6_addr));
192 pos += sizeof(struct in6_addr);
193 }
194
195 av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);
196 pos += strlen(&sap->ann[pos]) + 1;
197
198 if (avf_sdp_create(contexts, s->nb_streams, &sap->ann[pos],
199 sap->ann_size - pos)) {
200 ret = AVERROR_INVALIDDATA;
201 goto fail;
202 }
203 av_freep(&contexts);
204 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
205 pos += strlen(&sap->ann[pos]);
206 sap->ann_size = pos;
207
208 if (sap->ann_size > url_get_max_packet_size(sap->ann_fd)) {
209 av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "
210 "packet\n");
211 goto fail;
212 }
213
214 return 0;
215
216fail:
217 av_free(contexts);
218 sap_write_close(s);
219 return ret;
220}
221
222static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)
223{
224 AVFormatContext *rtpctx;
225 struct SAPState *sap = s->priv_data;
226 int64_t now = av_gettime();
227
228 if (!sap->last_time || now - sap->last_time > 5000000) {
229 int ret = url_write(sap->ann_fd, sap->ann, sap->ann_size);
230 /* Don't abort even if we get "Destination unreachable" */
231 if (ret < 0 && ret != FF_NETERROR(ECONNREFUSED))
232 return ret;
233 sap->last_time = now;
234 }
235 rtpctx = s->streams[pkt->stream_index]->priv_data;
236 return ff_write_chained(rtpctx, 0, pkt, s);
237}
238
239AVOutputFormat sap_muxer = {
240 "sap",
241 NULL_IF_CONFIG_SMALL("SAP output format"),
242 NULL,
243 NULL,
244 sizeof(struct SAPState),
245 CODEC_ID_AAC,
246 CODEC_ID_MPEG4,
247 sap_write_header,
248 sap_write_packet,
249 sap_write_close,
250 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
251};
252