rtp: set the payload type as stream id
[libav.git] / libavformat / sapenc.c
1 /*
2 * Session Announcement Protocol (RFC 2974) muxer
3 * Copyright (c) 2010 Martin Storsjo
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/parseutils.h"
24 #include "libavutil/random_seed.h"
25 #include "libavutil/avstring.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/time.h"
28 #include "internal.h"
29 #include "network.h"
30 #include "os_support.h"
31 #include "rtpenc_chain.h"
32 #include "url.h"
33
34 struct SAPState {
35 uint8_t *ann;
36 int ann_size;
37 URLContext *ann_fd;
38 int64_t last_time;
39 };
40
41 static int sap_write_close(AVFormatContext *s)
42 {
43 struct SAPState *sap = s->priv_data;
44 int i;
45
46 for (i = 0; i < s->nb_streams; i++) {
47 AVFormatContext *rtpctx = s->streams[i]->priv_data;
48 if (!rtpctx)
49 continue;
50 av_write_trailer(rtpctx);
51 avio_close(rtpctx->pb);
52 avformat_free_context(rtpctx);
53 s->streams[i]->priv_data = NULL;
54 }
55
56 if (sap->last_time && sap->ann && sap->ann_fd) {
57 sap->ann[0] |= 4; /* Session deletion*/
58 ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);
59 }
60
61 av_freep(&sap->ann);
62 if (sap->ann_fd)
63 ffurl_close(sap->ann_fd);
64 ff_network_close();
65 return 0;
66 }
67
68 static int sap_write_header(AVFormatContext *s)
69 {
70 struct SAPState *sap = s->priv_data;
71 char host[1024], path[1024], url[1024], announce_addr[50] = "";
72 char *option_list;
73 int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255;
74 AVFormatContext **contexts = NULL;
75 int ret = 0;
76 struct sockaddr_storage localaddr;
77 socklen_t addrlen = sizeof(localaddr);
78 int udp_fd;
79
80 if (!ff_network_init())
81 return AVERROR(EIO);
82
83 /* extract hostname and port */
84 av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port,
85 path, sizeof(path), s->filename);
86 if (base_port < 0)
87 base_port = 5004;
88
89 /* search for options */
90 option_list = strrchr(path, '?');
91 if (option_list) {
92 char buf[50];
93 if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) {
94 port = strtol(buf, NULL, 10);
95 }
96 if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) {
97 same_port = strtol(buf, NULL, 10);
98 }
99 if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) {
100 ttl = strtol(buf, NULL, 10);
101 }
102 if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) {
103 av_strlcpy(announce_addr, buf, sizeof(announce_addr));
104 }
105 }
106
107 if (!announce_addr[0]) {
108 struct addrinfo hints = { 0 }, *ai = NULL;
109 hints.ai_family = AF_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 #if HAVE_STRUCT_SOCKADDR_IN6
119 } else if (ai->ai_family == AF_INET6) {
120 /* With IPv6, you can use the same destination in many different
121 * multicast subnets, to choose how far you want it routed.
122 * This one is intended to be routed globally. */
123 av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr));
124 #endif
125 } else {
126 freeaddrinfo(ai);
127 av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported "
128 "address family\n", host);
129 ret = AVERROR(EIO);
130 goto fail;
131 }
132 freeaddrinfo(ai);
133 }
134
135 contexts = av_mallocz(sizeof(AVFormatContext*) * s->nb_streams);
136 if (!contexts) {
137 ret = AVERROR(ENOMEM);
138 goto fail;
139 }
140
141 s->start_time_realtime = av_gettime();
142 for (i = 0; i < s->nb_streams; i++) {
143 URLContext *fd;
144
145 ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port,
146 "?ttl=%d", ttl);
147 if (!same_port)
148 base_port += 2;
149 ret = ffurl_open(&fd, url, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
150 if (ret) {
151 ret = AVERROR(EIO);
152 goto fail;
153 }
154 ret = ff_rtp_chain_mux_open(&contexts[i], s, s->streams[i], fd, 0, i);
155 if (ret < 0)
156 goto fail;
157 s->streams[i]->priv_data = contexts[i];
158 av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename));
159 }
160
161 ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port,
162 "?ttl=%d&connect=1", ttl);
163 ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_WRITE,
164 &s->interrupt_callback, NULL);
165 if (ret) {
166 ret = AVERROR(EIO);
167 goto fail;
168 }
169
170 udp_fd = ffurl_get_file_handle(sap->ann_fd);
171 if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) {
172 ret = AVERROR(EIO);
173 goto fail;
174 }
175 if (localaddr.ss_family != AF_INET
176 #if HAVE_STRUCT_SOCKADDR_IN6
177 && localaddr.ss_family != AF_INET6
178 #endif
179 ) {
180 av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n");
181 ret = AVERROR(EIO);
182 goto fail;
183 }
184 sap->ann_size = 8192;
185 sap->ann = av_mallocz(sap->ann_size);
186 if (!sap->ann) {
187 ret = AVERROR(EIO);
188 goto fail;
189 }
190 sap->ann[pos] = (1 << 5);
191 #if HAVE_STRUCT_SOCKADDR_IN6
192 if (localaddr.ss_family == AF_INET6)
193 sap->ann[pos] |= 0x10;
194 #endif
195 pos++;
196 sap->ann[pos++] = 0; /* Authentication length */
197 AV_WB16(&sap->ann[pos], av_get_random_seed());
198 pos += 2;
199 if (localaddr.ss_family == AF_INET) {
200 memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr,
201 sizeof(struct in_addr));
202 pos += sizeof(struct in_addr);
203 #if HAVE_STRUCT_SOCKADDR_IN6
204 } else {
205 memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr,
206 sizeof(struct in6_addr));
207 pos += sizeof(struct in6_addr);
208 #endif
209 }
210
211 av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos);
212 pos += strlen(&sap->ann[pos]) + 1;
213
214 if (av_sdp_create(contexts, s->nb_streams, &sap->ann[pos],
215 sap->ann_size - pos)) {
216 ret = AVERROR_INVALIDDATA;
217 goto fail;
218 }
219 av_freep(&contexts);
220 av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
221 pos += strlen(&sap->ann[pos]);
222 sap->ann_size = pos;
223
224 if (sap->ann_size > sap->ann_fd->max_packet_size) {
225 av_log(s, AV_LOG_ERROR, "Announcement too large to send in one "
226 "packet\n");
227 goto fail;
228 }
229
230 return 0;
231
232 fail:
233 av_free(contexts);
234 sap_write_close(s);
235 return ret;
236 }
237
238 static int sap_write_packet(AVFormatContext *s, AVPacket *pkt)
239 {
240 AVFormatContext *rtpctx;
241 struct SAPState *sap = s->priv_data;
242 int64_t now = av_gettime();
243
244 if (!sap->last_time || now - sap->last_time > 5000000) {
245 int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size);
246 /* Don't abort even if we get "Destination unreachable" */
247 if (ret < 0 && ret != AVERROR(ECONNREFUSED))
248 return ret;
249 sap->last_time = now;
250 }
251 rtpctx = s->streams[pkt->stream_index]->priv_data;
252 return ff_write_chained(rtpctx, 0, pkt, s);
253 }
254
255 AVOutputFormat ff_sap_muxer = {
256 .name = "sap",
257 .long_name = NULL_IF_CONFIG_SMALL("SAP output"),
258 .priv_data_size = sizeof(struct SAPState),
259 .audio_codec = AV_CODEC_ID_AAC,
260 .video_codec = AV_CODEC_ID_MPEG4,
261 .write_header = sap_write_header,
262 .write_packet = sap_write_packet,
263 .write_trailer = sap_write_close,
264 .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER,
265 };