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2ba45a60 DM |
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/parseutils.h" | |
24 | #include "libavutil/random_seed.h" | |
25 | #include "libavutil/avstring.h" | |
26 | #include "libavutil/dict.h" | |
27 | #include "libavutil/intreadwrite.h" | |
28 | #include "libavutil/time.h" | |
29 | #include "internal.h" | |
30 | #include "network.h" | |
31 | #include "os_support.h" | |
32 | #include "rtpenc_chain.h" | |
33 | #include "url.h" | |
34 | ||
35 | struct SAPState { | |
36 | uint8_t *ann; | |
37 | int ann_size; | |
38 | URLContext *ann_fd; | |
39 | int64_t last_time; | |
40 | }; | |
41 | ||
42 | static int sap_write_close(AVFormatContext *s) | |
43 | { | |
44 | struct SAPState *sap = s->priv_data; | |
45 | int i; | |
46 | ||
47 | for (i = 0; i < s->nb_streams; i++) { | |
48 | AVFormatContext *rtpctx = s->streams[i]->priv_data; | |
49 | if (!rtpctx) | |
50 | continue; | |
51 | av_write_trailer(rtpctx); | |
52 | avio_close(rtpctx->pb); | |
53 | avformat_free_context(rtpctx); | |
54 | s->streams[i]->priv_data = NULL; | |
55 | } | |
56 | ||
57 | if (sap->last_time && sap->ann && sap->ann_fd) { | |
58 | sap->ann[0] |= 4; /* Session deletion*/ | |
59 | ffurl_write(sap->ann_fd, sap->ann, sap->ann_size); | |
60 | } | |
61 | ||
62 | av_freep(&sap->ann); | |
63 | if (sap->ann_fd) | |
64 | ffurl_close(sap->ann_fd); | |
65 | ff_network_close(); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static int sap_write_header(AVFormatContext *s) | |
70 | { | |
71 | struct SAPState *sap = s->priv_data; | |
72 | char host[1024], path[1024], url[1024], announce_addr[50] = ""; | |
73 | char *option_list; | |
74 | int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255; | |
75 | AVFormatContext **contexts = NULL; | |
76 | int ret = 0; | |
77 | struct sockaddr_storage localaddr; | |
78 | socklen_t addrlen = sizeof(localaddr); | |
79 | int udp_fd; | |
80 | AVDictionaryEntry* title = av_dict_get(s->metadata, "title", NULL, 0); | |
81 | ||
82 | if (!ff_network_init()) | |
83 | return AVERROR(EIO); | |
84 | ||
85 | /* extract hostname and port */ | |
86 | av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port, | |
87 | path, sizeof(path), s->filename); | |
88 | if (base_port < 0) | |
89 | base_port = 5004; | |
90 | ||
91 | /* search for options */ | |
92 | option_list = strrchr(path, '?'); | |
93 | if (option_list) { | |
94 | char buf[50]; | |
95 | if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) { | |
96 | port = strtol(buf, NULL, 10); | |
97 | } | |
98 | if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) { | |
99 | same_port = strtol(buf, NULL, 10); | |
100 | } | |
101 | if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) { | |
102 | ttl = strtol(buf, NULL, 10); | |
103 | } | |
104 | if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) { | |
105 | av_strlcpy(announce_addr, buf, sizeof(announce_addr)); | |
106 | } | |
107 | } | |
108 | ||
109 | if (!announce_addr[0]) { | |
110 | struct addrinfo hints = { 0 }, *ai = NULL; | |
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); | |
114 | ret = AVERROR(EIO); | |
115 | goto fail; | |
116 | } | |
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)); | |
126 | #endif | |
127 | } else { | |
128 | freeaddrinfo(ai); | |
129 | av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported " | |
130 | "address family\n", host); | |
131 | ret = AVERROR(EIO); | |
132 | goto fail; | |
133 | } | |
134 | freeaddrinfo(ai); | |
135 | } | |
136 | ||
137 | contexts = av_mallocz_array(s->nb_streams, sizeof(AVFormatContext*)); | |
138 | if (!contexts) { | |
139 | ret = AVERROR(ENOMEM); | |
140 | goto fail; | |
141 | } | |
142 | ||
143 | if (s->start_time_realtime == 0 || s->start_time_realtime == AV_NOPTS_VALUE) | |
144 | s->start_time_realtime = av_gettime(); | |
145 | for (i = 0; i < s->nb_streams; i++) { | |
146 | URLContext *fd; | |
147 | ||
148 | ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port, | |
149 | "?ttl=%d", ttl); | |
150 | if (!same_port) | |
151 | base_port += 2; | |
152 | ret = ffurl_open(&fd, url, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL); | |
153 | if (ret) { | |
154 | ret = AVERROR(EIO); | |
155 | goto fail; | |
156 | } | |
157 | ret = ff_rtp_chain_mux_open(&contexts[i], s, s->streams[i], fd, 0, i); | |
158 | if (ret < 0) | |
159 | goto fail; | |
160 | s->streams[i]->priv_data = contexts[i]; | |
161 | s->streams[i]->time_base = contexts[i]->streams[0]->time_base; | |
162 | av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename)); | |
163 | } | |
164 | ||
165 | if (s->nb_streams > 0 && title) | |
166 | av_dict_set(&contexts[0]->metadata, "title", title->value, 0); | |
167 | ||
168 | ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port, | |
169 | "?ttl=%d&connect=1", ttl); | |
170 | ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_WRITE, | |
171 | &s->interrupt_callback, NULL); | |
172 | if (ret) { | |
173 | ret = AVERROR(EIO); | |
174 | goto fail; | |
175 | } | |
176 | ||
177 | udp_fd = ffurl_get_file_handle(sap->ann_fd); | |
178 | if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) { | |
179 | ret = AVERROR(EIO); | |
180 | goto fail; | |
181 | } | |
182 | if (localaddr.ss_family != AF_INET | |
183 | #if HAVE_STRUCT_SOCKADDR_IN6 | |
184 | && localaddr.ss_family != AF_INET6 | |
185 | #endif | |
186 | ) { | |
187 | av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n"); | |
188 | ret = AVERROR(EIO); | |
189 | goto fail; | |
190 | } | |
191 | sap->ann_size = 8192; | |
192 | sap->ann = av_mallocz(sap->ann_size); | |
193 | if (!sap->ann) { | |
194 | ret = AVERROR(EIO); | |
195 | goto fail; | |
196 | } | |
197 | sap->ann[pos] = (1 << 5); | |
198 | #if HAVE_STRUCT_SOCKADDR_IN6 | |
199 | if (localaddr.ss_family == AF_INET6) | |
200 | sap->ann[pos] |= 0x10; | |
201 | #endif | |
202 | pos++; | |
203 | sap->ann[pos++] = 0; /* Authentication length */ | |
204 | AV_WB16(&sap->ann[pos], av_get_random_seed()); | |
205 | pos += 2; | |
206 | if (localaddr.ss_family == AF_INET) { | |
207 | memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr, | |
208 | sizeof(struct in_addr)); | |
209 | pos += sizeof(struct in_addr); | |
210 | #if HAVE_STRUCT_SOCKADDR_IN6 | |
211 | } else { | |
212 | memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr, | |
213 | sizeof(struct in6_addr)); | |
214 | pos += sizeof(struct in6_addr); | |
215 | #endif | |
216 | } | |
217 | ||
218 | av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos); | |
219 | pos += strlen(&sap->ann[pos]) + 1; | |
220 | ||
221 | if (av_sdp_create(contexts, s->nb_streams, &sap->ann[pos], | |
222 | sap->ann_size - pos)) { | |
223 | ret = AVERROR_INVALIDDATA; | |
224 | goto fail; | |
225 | } | |
226 | av_freep(&contexts); | |
227 | av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]); | |
228 | pos += strlen(&sap->ann[pos]); | |
229 | sap->ann_size = pos; | |
230 | ||
231 | if (sap->ann_size > sap->ann_fd->max_packet_size) { | |
232 | av_log(s, AV_LOG_ERROR, "Announcement too large to send in one " | |
233 | "packet\n"); | |
234 | goto fail; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | ||
239 | fail: | |
240 | av_free(contexts); | |
241 | sap_write_close(s); | |
242 | return ret; | |
243 | } | |
244 | ||
245 | static int sap_write_packet(AVFormatContext *s, AVPacket *pkt) | |
246 | { | |
247 | AVFormatContext *rtpctx; | |
248 | struct SAPState *sap = s->priv_data; | |
249 | int64_t now = av_gettime_relative(); | |
250 | ||
251 | if (!sap->last_time || now - sap->last_time > 5000000) { | |
252 | int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size); | |
253 | /* Don't abort even if we get "Destination unreachable" */ | |
254 | if (ret < 0 && ret != AVERROR(ECONNREFUSED)) | |
255 | return ret; | |
256 | sap->last_time = now; | |
257 | } | |
258 | rtpctx = s->streams[pkt->stream_index]->priv_data; | |
259 | return ff_write_chained(rtpctx, 0, pkt, s, 0); | |
260 | } | |
261 | ||
262 | AVOutputFormat ff_sap_muxer = { | |
263 | .name = "sap", | |
264 | .long_name = NULL_IF_CONFIG_SMALL("SAP output"), | |
265 | .priv_data_size = sizeof(struct SAPState), | |
266 | .audio_codec = AV_CODEC_ID_AAC, | |
267 | .video_codec = AV_CODEC_ID_MPEG4, | |
268 | .write_header = sap_write_header, | |
269 | .write_packet = sap_write_packet, | |
270 | .write_trailer = sap_write_close, | |
271 | .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER, | |
272 | }; |