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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Session Announcement Protocol (RFC 2974) muxer |
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| 3 | * Copyright (c) 2010 Martin Storsjo |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "avformat.h" |
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| 23 | #include "libavutil/parseutils.h" |
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| 24 | #include "libavutil/random_seed.h" |
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| 25 | #include "libavutil/avstring.h" |
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| 26 | #include "libavutil/dict.h" |
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| 27 | #include "libavutil/intreadwrite.h" |
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| 28 | #include "libavutil/time.h" |
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| 29 | #include "internal.h" |
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| 30 | #include "network.h" |
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| 31 | #include "os_support.h" |
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| 32 | #include "rtpenc_chain.h" |
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| 33 | #include "url.h" |
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| 34 | |||
| 35 | struct SAPState { |
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| 36 | uint8_t *ann; |
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| 37 | int ann_size; |
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| 38 | URLContext *ann_fd; |
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| 39 | int64_t last_time; |
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| 40 | }; |
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| 41 | |||
| 42 | static int sap_write_close(AVFormatContext *s) |
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| 43 | { |
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| 44 | struct SAPState *sap = s->priv_data; |
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| 45 | int i; |
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| 46 | |||
| 47 | for (i = 0; i < s->nb_streams; i++) { |
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| 48 | AVFormatContext *rtpctx = s->streams[i]->priv_data; |
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| 49 | if (!rtpctx) |
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| 50 | continue; |
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| 51 | av_write_trailer(rtpctx); |
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| 52 | avio_close(rtpctx->pb); |
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| 53 | avformat_free_context(rtpctx); |
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| 54 | s->streams[i]->priv_data = NULL; |
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| 55 | } |
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| 56 | |||
| 57 | if (sap->last_time && sap->ann && sap->ann_fd) { |
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| 58 | sap->ann[0] |= 4; /* Session deletion*/ |
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| 59 | ffurl_write(sap->ann_fd, sap->ann, sap->ann_size); |
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| 60 | } |
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| 61 | |||
| 62 | av_freep(&sap->ann); |
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| 63 | if (sap->ann_fd) |
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| 64 | ffurl_close(sap->ann_fd); |
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| 65 | ff_network_close(); |
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| 66 | return 0; |
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| 67 | } |
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| 68 | |||
| 69 | static int sap_write_header(AVFormatContext *s) |
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| 70 | { |
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| 71 | struct SAPState *sap = s->priv_data; |
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| 72 | char host[1024], path[1024], url[1024], announce_addr[50] = ""; |
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| 73 | char *option_list; |
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| 74 | int port = 9875, base_port = 5004, i, pos = 0, same_port = 0, ttl = 255; |
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| 75 | AVFormatContext **contexts = NULL; |
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| 76 | int ret = 0; |
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| 77 | struct sockaddr_storage localaddr; |
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| 78 | socklen_t addrlen = sizeof(localaddr); |
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| 79 | int udp_fd; |
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| 80 | AVDictionaryEntry* title = av_dict_get(s->metadata, "title", NULL, 0); |
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| 81 | |||
| 82 | if (!ff_network_init()) |
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| 83 | return AVERROR(EIO); |
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| 84 | |||
| 85 | /* extract hostname and port */ |
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| 86 | av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &base_port, |
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| 87 | path, sizeof(path), s->filename); |
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| 88 | if (base_port < 0) |
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| 89 | base_port = 5004; |
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| 90 | |||
| 91 | /* search for options */ |
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| 92 | option_list = strrchr(path, '?'); |
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| 93 | if (option_list) { |
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| 94 | char buf[50]; |
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| 95 | if (av_find_info_tag(buf, sizeof(buf), "announce_port", option_list)) { |
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| 96 | port = strtol(buf, NULL, 10); |
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| 97 | } |
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| 98 | if (av_find_info_tag(buf, sizeof(buf), "same_port", option_list)) { |
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| 99 | same_port = strtol(buf, NULL, 10); |
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| 100 | } |
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| 101 | if (av_find_info_tag(buf, sizeof(buf), "ttl", option_list)) { |
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| 102 | ttl = strtol(buf, NULL, 10); |
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| 103 | } |
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| 104 | if (av_find_info_tag(buf, sizeof(buf), "announce_addr", option_list)) { |
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| 105 | av_strlcpy(announce_addr, buf, sizeof(announce_addr)); |
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| 106 | } |
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| 107 | } |
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| 108 | |||
| 109 | if (!announce_addr[0]) { |
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| 110 | struct addrinfo hints = { 0 }, *ai = NULL; |
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| 111 | hints.ai_family = AF_UNSPEC; |
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| 112 | if (getaddrinfo(host, NULL, &hints, &ai)) { |
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| 113 | av_log(s, AV_LOG_ERROR, "Unable to resolve %s\n", host); |
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| 114 | ret = AVERROR(EIO); |
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| 115 | goto fail; |
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| 116 | } |
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| 117 | if (ai->ai_family == AF_INET) { |
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| 118 | /* Also known as sap.mcast.net */ |
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| 119 | av_strlcpy(announce_addr, "224.2.127.254", sizeof(announce_addr)); |
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| 120 | #if HAVE_STRUCT_SOCKADDR_IN6 |
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| 121 | } else if (ai->ai_family == AF_INET6) { |
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| 122 | /* With IPv6, you can use the same destination in many different |
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| 123 | * multicast subnets, to choose how far you want it routed. |
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| 124 | * This one is intended to be routed globally. */ |
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| 125 | av_strlcpy(announce_addr, "ff0e::2:7ffe", sizeof(announce_addr)); |
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| 126 | #endif |
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| 127 | } else { |
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| 128 | freeaddrinfo(ai); |
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| 129 | av_log(s, AV_LOG_ERROR, "Host %s resolved to unsupported " |
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| 130 | "address family\n", host); |
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| 131 | ret = AVERROR(EIO); |
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| 132 | goto fail; |
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| 133 | } |
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| 134 | freeaddrinfo(ai); |
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| 135 | } |
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| 136 | |||
| 137 | contexts = av_mallocz(sizeof(AVFormatContext*) * s->nb_streams); |
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| 138 | if (!contexts) { |
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| 139 | ret = AVERROR(ENOMEM); |
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| 140 | goto fail; |
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| 141 | } |
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| 142 | |||
| 143 | s->start_time_realtime = av_gettime(); |
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| 144 | for (i = 0; i < s->nb_streams; i++) { |
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| 145 | URLContext *fd; |
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| 146 | |||
| 147 | ff_url_join(url, sizeof(url), "rtp", NULL, host, base_port, |
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| 148 | "?ttl=%d", ttl); |
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| 149 | if (!same_port) |
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| 150 | base_port += 2; |
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| 151 | ret = ffurl_open(&fd, url, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL); |
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| 152 | if (ret) { |
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| 153 | ret = AVERROR(EIO); |
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| 154 | goto fail; |
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| 155 | } |
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| 156 | ret = ff_rtp_chain_mux_open(&contexts[i], s, s->streams[i], fd, 0, i); |
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| 157 | if (ret < 0) |
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| 158 | goto fail; |
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| 159 | s->streams[i]->priv_data = contexts[i]; |
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| 160 | av_strlcpy(contexts[i]->filename, url, sizeof(contexts[i]->filename)); |
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| 161 | } |
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| 162 | |||
| 163 | if (s->nb_streams > 0 && title) |
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| 164 | av_dict_set(&contexts[0]->metadata, "title", title->value, 0); |
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| 165 | |||
| 166 | ff_url_join(url, sizeof(url), "udp", NULL, announce_addr, port, |
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| 167 | "?ttl=%d&connect=1", ttl); |
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| 168 | ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_WRITE, |
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| 169 | &s->interrupt_callback, NULL); |
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| 170 | if (ret) { |
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| 171 | ret = AVERROR(EIO); |
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| 172 | goto fail; |
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| 173 | } |
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| 174 | |||
| 175 | udp_fd = ffurl_get_file_handle(sap->ann_fd); |
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| 176 | if (getsockname(udp_fd, (struct sockaddr*) &localaddr, &addrlen)) { |
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| 177 | ret = AVERROR(EIO); |
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| 178 | goto fail; |
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| 179 | } |
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| 180 | if (localaddr.ss_family != AF_INET |
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| 181 | #if HAVE_STRUCT_SOCKADDR_IN6 |
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| 182 | && localaddr.ss_family != AF_INET6 |
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| 183 | #endif |
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| 184 | ) { |
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| 185 | av_log(s, AV_LOG_ERROR, "Unsupported protocol family\n"); |
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| 186 | ret = AVERROR(EIO); |
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| 187 | goto fail; |
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| 188 | } |
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| 189 | sap->ann_size = 8192; |
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| 190 | sap->ann = av_mallocz(sap->ann_size); |
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| 191 | if (!sap->ann) { |
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| 192 | ret = AVERROR(EIO); |
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| 193 | goto fail; |
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| 194 | } |
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| 195 | sap->ann[pos] = (1 << 5); |
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| 196 | #if HAVE_STRUCT_SOCKADDR_IN6 |
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| 197 | if (localaddr.ss_family == AF_INET6) |
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| 198 | sap->ann[pos] |= 0x10; |
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| 199 | #endif |
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| 200 | pos++; |
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| 201 | sap->ann[pos++] = 0; /* Authentication length */ |
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| 202 | AV_WB16(&sap->ann[pos], av_get_random_seed()); |
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| 203 | pos += 2; |
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| 204 | if (localaddr.ss_family == AF_INET) { |
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| 205 | memcpy(&sap->ann[pos], &((struct sockaddr_in*)&localaddr)->sin_addr, |
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| 206 | sizeof(struct in_addr)); |
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| 207 | pos += sizeof(struct in_addr); |
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| 208 | #if HAVE_STRUCT_SOCKADDR_IN6 |
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| 209 | } else { |
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| 210 | memcpy(&sap->ann[pos], &((struct sockaddr_in6*)&localaddr)->sin6_addr, |
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| 211 | sizeof(struct in6_addr)); |
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| 212 | pos += sizeof(struct in6_addr); |
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| 213 | #endif |
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| 214 | } |
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| 215 | |||
| 216 | av_strlcpy(&sap->ann[pos], "application/sdp", sap->ann_size - pos); |
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| 217 | pos += strlen(&sap->ann[pos]) + 1; |
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| 218 | |||
| 219 | if (av_sdp_create(contexts, s->nb_streams, &sap->ann[pos], |
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| 220 | sap->ann_size - pos)) { |
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| 221 | ret = AVERROR_INVALIDDATA; |
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| 222 | goto fail; |
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| 223 | } |
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| 224 | av_freep(&contexts); |
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| 225 | av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]); |
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| 226 | pos += strlen(&sap->ann[pos]); |
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| 227 | sap->ann_size = pos; |
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| 228 | |||
| 229 | if (sap->ann_size > sap->ann_fd->max_packet_size) { |
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| 230 | av_log(s, AV_LOG_ERROR, "Announcement too large to send in one " |
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| 231 | "packet\n"); |
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| 232 | goto fail; |
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| 233 | } |
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| 234 | |||
| 235 | return 0; |
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| 236 | |||
| 237 | fail: |
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| 238 | av_free(contexts); |
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| 239 | sap_write_close(s); |
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| 240 | return ret; |
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| 241 | } |
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| 242 | |||
| 243 | static int sap_write_packet(AVFormatContext *s, AVPacket *pkt) |
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| 244 | { |
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| 245 | AVFormatContext *rtpctx; |
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| 246 | struct SAPState *sap = s->priv_data; |
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| 247 | int64_t now = av_gettime(); |
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| 248 | |||
| 249 | if (!sap->last_time || now - sap->last_time > 5000000) { |
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| 250 | int ret = ffurl_write(sap->ann_fd, sap->ann, sap->ann_size); |
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| 251 | /* Don't abort even if we get "Destination unreachable" */ |
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| 252 | if (ret < 0 && ret != AVERROR(ECONNREFUSED)) |
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| 253 | return ret; |
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| 254 | sap->last_time = now; |
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| 255 | } |
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| 256 | rtpctx = s->streams[pkt->stream_index]->priv_data; |
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| 257 | return ff_write_chained(rtpctx, 0, pkt, s); |
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| 258 | } |
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| 259 | |||
| 260 | AVOutputFormat ff_sap_muxer = { |
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| 261 | .name = "sap", |
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| 262 | .long_name = NULL_IF_CONFIG_SMALL("SAP output"), |
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| 263 | .priv_data_size = sizeof(struct SAPState), |
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| 264 | .audio_codec = AV_CODEC_ID_AAC, |
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| 265 | .video_codec = AV_CODEC_ID_MPEG4, |
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| 266 | .write_header = sap_write_header, |
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| 267 | .write_packet = sap_write_packet, |
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| 268 | .write_trailer = sap_write_close, |
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| 269 | .flags = AVFMT_NOFILE | AVFMT_GLOBALHEADER, |
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| 270 | }; |