| 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 | }; |